法国专利FR3082641A1 DATA INPUT DEVICE FOR APPLICATION ON A TOUCH PANEL OF A TERMINAL, CORRESPONDING METHOD AND SYSTEM.

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专利摘要:
It is proposed a data entry device (1) intended to be affixed to a capacitive touch screen (24) of a terminal (2), comprising an electrode matrix having nodes, and controlled by a controller performing cycles capacitive scanning and measurement of the variations in node capacity compared to reference values, detecting significant pressure on the slab and recalibrating the reference values. The device comprises: a plate comprising a lower face for affixing the device to the slab, and an upper face comprising a matrix of gripping zones having a thickness allowing detection of a finger by the slab; at least one contact pad, flat, electrically conductive and integral with the lower face; and a network of conductive tracks, extending over at least part of the upper face and electrically connected to the at least one contact pad.
公开号:FR3082641A1
申请号:FR1855293
申请日:2018-06-15
公开日:2019-12-20
发明作者:Stephane Pavageau；Andre Carabelli；Benoit Pouhaer
申请人:Ingenico Group SA；
IPC主号:

专利说明:

Data entry device intended to be affixed to a touch screen of a terminal, method and corresponding entry system.
1. TECHNICAL AREA
This technique relates to the field of data entry on terminals (mobile phones, computers, tablets, payment terminals, automatic teller machines (ATMs), communication terminals which are temporarily transformed into payment terminals, etc.) .
More specifically, the present technique relates to a data entry device intended to be affixed to a touch screen of a terminal (also called "touch screen", or even "touch screen" or "touch panel" in English).
This technique applies in particular, but not exclusively, to the entry of confidential codes or personal identification codes (or PIN code for "Personal Identification Number" in English) on a touch screen of a terminal, for example for visually impaired people.
2. TECHNOLOGICAL BACKGROUND
Touch screens are widely used for entering data within computerized data processing systems. For example, mobile phones, computers, tablets, payment terminals and automatic teller machines (ATMs) have touch screens to facilitate data entry by users.
To make an entry, a user can select one or more keys (each associated with an alphanumeric character) on a virtual keyboard displayed on the touch screen, using a finger or a stylus. This eliminates the need for a physical keyboard to enter data. However, entering data with a virtual keyboard has drawbacks, especially for the visually impaired, but also for technophobic people or those who are not used to digital uses. In particular, unlike physical keyboards, virtual keyboards are displayed on a flat screen and do not allow certain users (in particular visually impaired people) to locate themselves spatially on virtual keys.
This drawback is particularly troublesome for payment terminals or automatic teller machines (ATMs) which have a touch screen. Indeed, when a user uses his bank card to make a payment or to withdraw tickets, he must enter his PIN code to authenticate. It is not possible for a visually impaired person to enter their PIN code on a virtual keyboard displayed on a touch screen.
A European directive (in the process of being drafted) will soon oblige merchants and bankers to provide a solution for the visually impaired. The prior art solution is to always provide an electronic physical keyboard connected to a payment terminal, even if a virtual keyboard is available on the touch screen. The manufacturing cost of payment terminals or automatic teller machines (ATMs) is thus increased, without the solution being really attractive, in particular from the technical and aesthetic points of view. Indeed, the physical keyboard intended for the visually impaired must be secure to avoid piracy, increasing the cost, and this keyboard is generally not aesthetically integrated into the touch solution.
In addition, in addition to the aesthetic and cost issues, there is also an important safety issue. Unlike a standard user, vulnerable people, like the visually impaired, often have to ask for help from people they don't necessarily know. This is a great source of stress for these vulnerable people. When it comes, for example, to typing a PIN code, and therefore to revealing sensitive information, it is necessary to ensure that the person whose help is possibly sought will not try to keep this information for use fraudulent.
Likewise, many users are unable to effectively detect and combat the applications and spyware that are installed on their communication terminals. However, more and more communication terminals are used for the purpose of entering confidential information and in particular payment information (PIN code, bank accounts, etc.). To counter these fraud problems, the existing solutions propose a random display of the virtual keyboard; in such a random display, the keys of the keyboard are arranged randomly and the user must identify the keys in order to be able to enter his confidential data (for example the PIN code). A secure application, installed on the communication terminal, is responsible for making the correspondence between the user's input areas and the corresponding characters. It is understandable that such a way of doing things is not suitable for many users, and in particular for the visually impaired or more generally for those on a break with the digitization of these touch screen input operations.
There is thus a need to provide a solution allowing users to enter confidential data on terminals (payment terminals and communication terminals for example) comprising a touch screen, ensuring the security of the data entered, while reducing the cost of this solution and retaining the aesthetic appearance generated by the use of touch screens.
3. SUMMARY
The invention notably makes it possible to facilitate data entry operations on a touch screen (also called touch screen), in particular for the visually impaired. The solution of the invention is not however limited to use by a visually impaired person and can be used by any person to enter, in a simple, ergonomic and secure manner, information (confidential or not) on a touch screen .
In a particular embodiment of the invention, there is provided a data entry device intended to be affixed to a touch screen of a terminal, said touch screen being capacitive, comprising row and column electrodes forming a matrix. of electrodes comprising nodes (constituting as many measurement points), and being controlled by a control unit configured to carry out capacitive scanning cycles and to measure the variations in capacity of the nodes with respect to reference values, detecting significant presses on the touch screen as a function of the measured capacity variations, and recalibrate the reference values as a function of the measured capacity variations. The input device includes:
• a generally parallelepipedic plate comprising a generally planar lower face for affixing the device to the touch screen, and an upper face comprising a matrix of input zones forming a keyboard, the input zones having a thickness configured to allow detection of a finger by the touch screen when the device is affixed to the touch screen;
• at least one contact pad, flat, electrically conductive and integral with the underside; and • a network of conductive tracks, extending over at least part of the upper face and being electrically connected to said at least one contact pad, so that when the device is affixed to the touch screen, and even in the absence of a finger on the network of conductive tracks, the network of conductive tracks interacts with the touch screen during the capacitive scanning cycles, which prevents a recalibration of the reference values which itself would prevent said at least one contact pad is detected as a significant support, without the network of conductive tracks itself being detected as a significant support.
The proposed solution is therefore based on a completely new and inventive approach, consisting in providing a capture device intended to be affixed to the touch screen of a terminal, in order to obtain a system whose operation is as follows:
• thanks to the detection of the contact pad (s) (or “contact pad” in English), present on the underside of the input device and coming into contact with the touch screen when the device is affixed to it Ci, the terminal can detect this apposition, as well as the orientation of the device on the touch screen (several solutions to determine this orientation are detailed below); then • knowing the orientation of the device on the touch screen, and therefore the position on the touch screen of each of the input zones (forming input keys) of the device, the terminal can, each time it detects a press of 'a finger of the user on the touch screen through one of the input zones of the device, determine which keyboard character (for example among the numbers 0 to 9) or keyboard function (for example among' cancel ') , "Erasure" and "validation") corresponds to this support.
As detailed below, in relation to the figures, the detection of the contact pad (s) (as significant support (s) on the touch screen) is maintained possible thanks to the network of conductive tracks present on the upper face of the gripping device and electrically connected to the contact pad (s). In fact, the network of conductive tracks makes it possible to avoid the terminal performing a recalibration of the touch screen, that is to say a recalibration (an update), after a few capacitive scanning cycles, of one or more of the reference values associated with the nodes of the electrode array of the capacitive touch screen. The touch screen recalibration mechanism aims to compensate (and if possible make disappear), in the detection results, any electrically conductive object (for example a drop of water) which comes into contact with the touch screen and which has a too stable behavior, and therefore constitutes additional noise to be suppressed (unlike pressing the user's finger). Therefore, if not prevented, recalibrating the touch screen would make the contact pad (s) (as additional noise) "invisible" (that is, not detected). The touchscreen recalibration mechanism, and how the network of conductive tracks prevents it, are discussed in detail below.
Thus, the proposed solution makes it possible to dispense with the use of a physical keyboard, while allowing input of information:
• simple and ergonomic, thanks to easy identification of the input zones of the device (in particular but not exclusively by a visually impaired person), and • secure, since it does not require the solicitation of a third party by the user and that there are no fingerprints on the touch screen (which could help a fraudster to find a code that has just been entered). Security can be further increased in the case (described in detail below) where, after having detected the affixing of the device on the touch screen, the terminal switches to an appropriate input mode (hereinafter called "blind mode") in which no virtual keyboard is displayed on the touch screen.
In addition, the gripping device can be a personal object, which is a hygienic advantage for an object that touches. In the case of a shared object, it can be envisaged that the gripping device is made of “anti-bacterial” material (for example a material with a silver ion type additive, as in refrigerators).
An additional advantage of an individual accessory is that the user is assured that no spy device has been added to the device to recover their PIN code.
In a first particular implementation, the lower face comprises at least two contact pads.
Thus, when the input device is affixed to the touch screen, the terminal detects the contact pads, and by analysis of the results of this detection (number and shape of the pads, distance between them) deduces the presence, the position and the 180 ° modulo orientation of the device on the touch screen. This assumes that the terminal knows the number of contact pads, their shapes, the distances between them, and their positions within the geometry of the input device.
If the terminal is small, it can be assumed that the input device is correctly positioned. So, in this case, we can assume an orientation (removal of the ambiguity of the 180 ° modulo). This is acceptable, because when you press a key, if it does not work, you will realize it immediately.
In a variant, the gripping device comprises a single contact pad, having a particular shape (for example oblong or rectangular, with a sufficient length) making it possible to identify it and to know its orientation (and hence also the orientation of the gripping device).
According to a particular characteristic of the first implementation, said at least two contact pads have different shapes.
Thus, the terminal can detect the orientation of the input device without the 180 ° modulo. In other words, we can deduce the correct orientation, even with two contact pads, provided that the second pad is very different in shape from the first (like a circle (or a square) for one, and a rectangle whose length is twice its width for the other).
In a second particular implementation, the lower face comprises at least three contact pads.
Thus, the terminal can detect the orientation of the input device without the 180 ° modulo. Indeed, all of the at least three contact pads form a signature (particular triangular geometry; flat triangle in a particular implementation) specific to the data entry device, which can be detected and recognized by the terminal when the device is affixed on the touch screen.
According to a particular characteristic, the matrix of input zones forming a keyboard comprises a set of input keys which are generally flat, formed on the upper surface and separated from each other by a grid of profiles of predetermined heights and / or shapes, and the network of conductive tracks is formed in the upper part of the grid of profiles.
Thus, the user (in particular a visually impaired person) identifies himself with the aid of the grid of profiles which delimit the keys relative to each other, according to the shapes and / or heights of these profiles. In a particular implementation, the five key does not have the same height as the other numeric keys and / or the height of the numeric keys is not the same as that of the function keys, to further facilitate the location of the keys by the 'user. In a particular implementation, the input keys do not include any specific indication of their function, so as to reinforce security by preventing an attacker from monitoring the keys which are used for input.
Several advantages arise from the formation of the network of conductive tracks in the upper part of the profile grid:
• the network of conductive tracks can extend over a substantial part of the upper face of the gripping device (because in practice the profile grid occupies almost all of the upper face of the gripping device), and therefore interact with several nodes of the electrode matrix of the touch screen (the network of conductive tracks causes charge transfers, synchronous with the scanning of the screen and therefore not stable) and therefore better efficiency to prevent the terminal from recalibrating the touch screen );
• in the data entry phase by the user (ie after the terminal has detected the presence and the orientation of the input device on the touch screen), the network of conductive tracks improves detection of the contact pad (s), since to touch the input keys the user's finger touches (or approaches if there is a protective varnish) the network of conductive tracks, which is itself in electrical contact with the or contact pads. Consequently, during capacitive scanning cycles, loads are not transferred (or attracted) only by the contact pad (s) but also by the user's finger. So the local modification of the electric field is more important (we thus magnify the signal at the locations of the pads) than during the initial detection phase of the input device (during which the user generally does not touch (or approach) / plus the network of conductive tracks after having affixed the input device on the touch screen). Remember that the finger does not need to touch: there is a capacitance between the user's finger and the network of conductive tracks. This behaves like two capacities in series: a first capacity between the touch screen and the contact pads, a second capacity between the network of conductive tracks and the user's finger, and between these first and second capacities the resistance of the elements. conductors connecting the contact pads and the network of conductive tracks.
According to a particular characteristic, the network of conductive tracks and the underside are separated by a distance of between 1.5 mm and 4.5 mm, and the conductive tracks have a width of between 0.5 mm and 2 mm.
Thus, the network of conductive tracks has a capacity with respect to the touch screen, low enough so that it is not detected as a significant support, but sufficient for its interaction with the touch screen to avoid recalibration of it. In addition, the height of the network of conductive tracks (relative to the touch screen) makes it possible to have, whatever the position of the input device (in X / Y) on the touch screen, a distance from the electrodes of the touch screen, quite large, and almost constant.
According to a particular characteristic, the lower face comprises at least two contact pads, and the network of conductive tracks has a resistance, between contact pads, of between 20 Ω and 150 kQ.
Thus, the responsiveness of the keyboard input area matrix is improved.
In a first particular implementation of the network of conductive tracks, the network of conductive tracks is printed on the upper face and covered with a non-conductive layer, protective against abrasion.
Various techniques allow this first implementation. For example, the conductive tracks are printed by screen printing (film screen printed upside down, then overmolded) and the protective layer is a varnish. It is recalled that despite the fact that the user does not directly touch the network of conductive tracks, he approaches his finger at a very small distance. Consequently, there is a low capacitance between the network of conductive tracks and the user's finger, which is in series with another capacity (that between the touch screen and the contact pads) via the network of conductive tracks (including the resistance changes the RC circuit).
In a second particular implementation of the network of conductive tracks, the network of conductive tracks is made of thick conductive material having a thickness of at least 0.3 mm.
Various techniques allow this second implementation. For example, the thick conductive material is a carbon-filled silicone material, produced by co-molding (conductive insert in a silicone mold).
According to a particular characteristic, the plate consists of an electrically insulating material.
This prevents the plate (i.e. the main body of the gripping device) from having a capacity (over its entire surface) detected by the slab.
In a first particular implementation of the plate, the plate is made of rigid and transparent plastic.
Thus, the gripping device is safe. Indeed, due to the transparency of the plate, it is not possible to add fraudulent mechanisms for monitoring seizures. Indeed, if such mechanisms were added, they would be immediately detected.
According to a particular characteristic of the first particular implementation of the plate, the lower face has four angles and comprises, in at least two adjacent angles among said angles, a generally planar foot of thickness between 0.1 and 0.4 mm. In a particular implementation, the lower face includes a foot in each of the two “top” angles (in the plane of the upper face of the plate), which avoids limping of the gripping device, whether the plate is concave or convex . The “bottom” angles (in the plane of the upper face of the plate) are for example aligned with the contact pad (s). In a variant, the lower face further comprises a foot in each of the two “bottom” angles (ie four feet in total).
In this way, when the data entry device is affixed to the touch screen, the feet guarantee that the contact pad (s) is (are) in good contact with the touch screen, even if the plate is not not perfectly flat (the height of the feet is adapted to the flatness of the plate).
In a second particular implementation of the plate, the plate is made of translucent silicone, making it possible to deform and adapt perfectly to the flatness of the touch screen.
Thus, when the data entry device is affixed to the touch screen, the contact pad (s) is (are) in good contact with the touch screen. The translucent aspect also makes it possible to verify that no fraudulent mechanism is inserted.
In addition, the fact of using silicone makes it possible to have a high coefficient of friction with respect to the slab, and therefore makes it possible to limit unwanted translations, and therefore facilitates the entry of the code. In other words, silicone adheres to the touch screen (even without a suction cup) and it really helps the visually impaired.
According to a particular characteristic, the gripping device comprises at least one suction cup, integral with the lower face and intended to come into contact with the touch screen.
Thus, the gripping device can be held against the touch screen, even if the latter is not arranged flat (sloping touch screen). It also allows the location search by the visually impaired person not to drag the input device out of the active area of the touch screen (which would be very disorienting for a blind person.
According to a particular characteristic, the plate is substantially the dimensions of a bank card, in length and width.
Choosing the dimensions of a bank card (54 mm x 85 mm), to the nearest millimeter (for example ± 2 or 3 mm), has several advantages:
• this represents a sufficient area for the network of conductive tracks to sufficiently disturb the capacitive detections of the touch screen and therefore that the latter does not recalibrate itself;
• this surface makes it possible to have sufficiently large input zones (keys);
• this allows the input device to be placed in a wallet or a card holder, and therefore to transform the input device into an individual accessory;
• the input device itself can be used as a bank card holder for the blind (via, for example, hinges, slides, etc.).
According to a particular characteristic, the matrix of input zones forming a keyboard is representative of a keyboard for entering a confidential code on a payment terminal.
In another embodiment of the invention, there is provided a terminal comprising a capacitive touch screen, comprising row and column electrodes forming an electrode array comprising nodes (constituting as many measurement points), and a control unit, configured to perform cycles of capacitive scanning and of measuring the variations in capacity of the nodes with respect to reference values, detecting significant presses on the touch screen as a function of the variations in capacity measured, and recalibrating the reference values as a function of the measured capacity variations. Said control unit is configured to further perform:
• a first detection, of an affixing of a data entry device (according to any one of the abovementioned embodiments) on the touch screen, said first detection being based on a detection of said at least one contact pad ; and • a second detection, of an input by a user of at least one piece of data, said second detection being based on a detection of at least one press of a finger of said user on one of the input areas forming a keyboard.
In another embodiment of the invention, a method for entering data on a touch screen of a terminal is proposed, comprising the following steps:
• first detection, by the terminal, of an affixing of a data entry device (according to any one of the abovementioned embodiments) on the touch screen, said first detection being based on a detection of said at least one contact pad; and • second detection, by the terminal, of an input by a user of at least one data item, said second detection being based on a detection of at least one finger press of said user on one of the input zones forming keyboard.
Thus, the terminal and the method executed by it benefit from all the advantages discussed above for the input device.
According to a particular characteristic, said first detection is also based on a verification that each of the input zones is present at least partially in an active zone of the touch screen.
This verification makes it possible to guarantee the proper functioning of the next phase of entry by the user of at least one data item. By accepting even a partial presence (for example at least two-thirds) of an input area (key) on the active area of the touch screen, the user is offered more possibilities for affixing the input device on the touchpad.
According to a particular characteristic, the method comprises, after the first detection step and before the second detection step, a step of switching the terminal into an input mode adapted to the data input device.
Thus, the appropriate input mode (“blind mode”) can have various parameters (filtering of presses outside the size of the input device, filtering of presses below a certain duration or by double click, acknowledgment of any key press by a sound feedback or sensory feedback (haptic vibration), erasing of the virtual keyboard on the touch screen, etc.). Clearing the virtual keyboard increases the level of data entry security (particularly confidential), by preventing malicious people from spotting the data entered.
4.
LIST OF FIGURES
Other characteristics and advantages of the invention will appear on reading the following description, given by way of non-limiting example, and the attached drawings, in which:
Figure 1 illustrates a data entry device and a terminal according to a first embodiment of the invention;
FIGS. 2A and 2B are detailed views, of the upper face and of the lower face respectively, of the gripping device of FIG. 1;
Figure 3 is a view of part of Figure 2A, detailing the grid of profiles and the network of conductive tracks appearing in Figure 2A;
Figure 4 is a sectional view of the data entry device, at the third row of keys, showing an embodiment of the grid of profiles;
Figure 5 is a detailed view of part of Figure 2B, illustrating a contact pad and two feet;
FIG. 6 illustrates a first variant of the set of contact pads;
FIG. 7 illustrates a second variant of the set of contact pads;
FIG. 8 shows an example of the structure of the terminal of FIG. 1;
FIG. 9 presents a flow diagram of a method according to a particular embodiment of the invention, executed by the terminal; and FIG. 10 illustrates a data entry device, according to a second embodiment of the invention.
5. DETAILED DESCRIPTION
In all the figures in this document, identical elements and steps are designated by the same reference numeral.
5.1 Reminders on capacitive touch screens
There are several technologies exploiting capacitive phenomena to detect the position of a finger on a touch screen. The two most common technologies are surface capacitive technology ("Surface Capacitive" in English) and projected capacitive technology (PCT or PCAP, for "Projected Capacitive
Touch ”in English). For the second, there are generally two sub-categories: projected intrinsic capacitive technology (“Self Capacitance” in English) and projected mutual capacitive technology (“Mutual capacitance” in English).
5.1.1 Capacitive surface technology
The easiest way to make a capacitive touchscreen is to cover one side of the screen with a transparent conductive layer, such as tin indium oxide (ITO). A slight tension is applied to the four corners of the slab, which creates a uniform electric field. When a finger touches the other side of the glass, the controller (also called control unit, processor or microprocessor) of the panel can determine the location of the touch input by analyzing the change in capacitance measured from the changes in tension in the four corners of the panel. It is not possible to recognize multiple tactile entry points ("multitouch"). Unwanted detection of false entries, caused by unexpected signals from the environment, can also be an issue.
5.1.2 The projected capacitive technology
In the projected capacitive technology, electrodes (conductive wires) are applied in rows and columns on two parallel sheets of glass, which forms a grid of electrodes. Voltage is applied sequentially to the electrode rows and columns. The controller identifies the location of the touch input by measuring the change in capacitance in the electrode grid.
5.1.2.a) The projected intrinsic capacitive technology
A touch screen according to the projected intrinsic capacitive technology is similar to a surface capacity screen, but the two layers of ITO are etched: with electrodes in rows on one side and electrodes in columns on the other side. The controller measures the capacity of each electrode (in line as well as in column) with respect to a reference signal (most often the ground). The principle of capacity variation is identical to the surface capacity technology. The rows and columns are scanned and the equivalent capacity is measured for each electrode. Each row and each column operating independently, this technology does not allow multiple activation points to be detected simultaneously. Ghost phenomena can appear when two fingers are on the touch screen. To meet market demand, this technology has been improved to provide multipoint solutions without phantom phenomenon.
5.1.2.b) The projected mutual capacitive technology
The structure of a touch screen according to the projected mutual capacitive technology is identical to that according to the projected intrinsic capacitive technology, but multi-point detection is possible thanks to the acquisition method of the controller. The latter measures the capacitance between an electrode pair comprising an X electrode (line) and a Y electrode (column). Without activation, the capacitance between this pair of electrodes remains constant. When the finger is near an electrode, the capacity varies. In some implementations, the X and Y electrodes are on the same face and at each crossing the electrodes are isolated by an insulating layer. Measuring the variation in capacity between each pair of X and Y electrodes makes it possible to determine the x and y coordinates of the activation zone.
In other words, the touch screen includes row and column electrodes forming an electrode array comprising nodes. The controller (control unit) performs capacitive scanning cycles in order to measure variations in the capacity of the nodes with respect to reference values and to detect significant presses on the touch screen as a function of the variations in capacity measured. For each node, the controller makes a comparison between the variation in capacity and a variation threshold. Depending on the nodes where the capacity variation is significant, and the surface (s) they form, the controller makes a decision and provides a result indicating whether one or more significant presses on the touch screen (by an electrically conductive element, such as a finger or stylus) have been detected.
Patent document WO2011 / 0849917A2 describes an example of implementation of a touch screen according to the projected mutual capacitive technology.
For the decision by the controller, the threshold as well as the surface are parameters which depend on the slab. For example, for a specific slab, imagine reference values in the order of 7000 units. If a finger is placed on the slab, the variation in capacity is around 1000, and several nodes are impacted (there is therefore a large area): the controller detects the finger. If a stylus is placed on the slab, the capacity variation is of the order of 300 (the rubber is less electrically conductive), and few knots are impacted (there is therefore a small surface): the controller detects the stylus . If we place the point of a needle on the slab, even if the variation in capacity is very high, there is only one knot involved (the surface is too small and is not in the template of acceptance): the controller does not hold the needle contact point and does not detect any significant pressure. In these examples, the user's finger (or the conductive stylus or the needle, connected to a user) behaves like a parallel capacitor, which already has a large charge. By carrying out the capacity surveillance scan, this makes a point of evacuation of the charges, easily identifiable.
5.1.3 Recalibration of the touch screen (in projected mutual capacitive technology)
As indicated above, in the projected mutual capacitive technology, the controller continuously monitors the variations in capacitances at the nodes of the electrode array (by comparing each variation with a reference value), and indicates whether one or more significant presses on the touch screen were detected (taking into account a minimum surface, expressed in number of nodes, so that a support is significant).
The reference values can be revised depending on the events: this is the recalibration of the slab. For example, if a conductive object comes into contact with the slab (for example a drop of water), the variation in capacity for the nodes concerned is detected very quickly. And therefore significant support (whose surface corresponds to that of the contact area between the conductive object and the slab) is retained by the controller. On the other hand, after a few capacitive scanning cycles, this contact area, isolated from the rest of the slab, has been loaded by the scans and is saturated: the controller detects that it is an additional noise, and reviews (increases) the reference values for the concerned nodes of the slab. Following this change of reference values, the controller detects, during the following scanning cycles, that for the nodes concerned the capacity variation is no longer greater than the variation threshold, and the controller ceases to consider that it has is a significant support.
In other words, in the projected mutual capacitive technology, the controller performs a recalibration of the touch screen, that is to say an update, after a few capacitive scanning cycles, of one or more of the reference values associated with the nodes of the electrode matrix. This makes it possible to remove, in the detection results of the controller, any electrically conductive object (for example a drop of water) which comes into contact with the touch screen and which behaves too stable, and therefore constitutes additional noise to delete (unlike pressing the user's finger).
Similarly, if we approach the hand of a capacitive panel, even if it is very far away (on the order of a few centimeters), the surface of the hand being very large, we have an induced capacity which is measurable. However, the controller, thanks to the setting of the slab (large surface, small capacity variation) can ignore this surface.
A slab without dynamic recalibration will have an erratic functioning, while a slab with too much recalibration will not be able to detect presses with weakly capacitive objects. Recalibration can be done on a stable load or on a minimal surface, at start-up or on request.
5.2 First embodiment of the input device
There is described in relation to Figures 1 to 7. a data entry device 1 and a terminal 2 according to a first embodiment of the invention.
As illustrated in FIG. 1. the data entry device 1 is intended to be affixed to a touch screen 24 of the terminal 2 (it is for example a communication terminal acting as a payment terminal). The terminal 2 and the input device 1 constitute a data entry system, in particular but not exclusively for the visually impaired.
The touch screen 24 is a touch screen according to the projected mutual capacitive technology (see description above). It includes row and column electrodes forming an electrode array comprising nodes. It is controlled by a controller (also called a "control unit"), for example the processor 21 of the terminal 2 (see FIG. 8), configured to: perform cycles of capacitive scanning and of measuring variations in the capacity of the nodes with respect to to reference values; detect significant presses on the touch screen as a function of the measured capacity variations; and recalibrate the reference values according to the measured capacity variations.
As illustrated in Figures 2A and 2B. the data entry device 1 comprises:
• a generally parallelepiped plate 30 comprising a lower face
18, generally planar, for affixing the device 1 to the touch screen 24, and an upper face 17 comprising a matrix of input zones forming a keyboard, the input zones 10-0 to 10-9 and 11-1 to 11- 3 having a thickness configured to allow detection of a finger by the touch screen when the device is affixed to the touch screen (in FIG. 3, the thickness of the key referenced 105 is denoted e2 and is for example equal to 0 , 2 mm);
• two contact pads 15-1 and 15-2 (or "contact pad" in English), which are flat, electrically conductive and integral with the underside 18 of the plate 30; and • a network of conductive tracks 19, which extends over at least part of the upper face 17 of the plate 30 and is electrically connected to the contact pads 15-1 and 15-2.
The matrix of input zones comprises a set of substantially rectangular input keys grouped into a first subset and a second subset. The set of input keys is representative of a keyboard for entering a confidential code on a payment terminal.
The first subset includes ten numeric keys 10-0 to 10-9 representing the digits 0 to 9. The numeric keys are generally flat and do not include any specific indication as to the digits they represent. This is to prevent an attacker from monitoring the keys that are used for input. The number five key 10-5 includes, in its center, a locating pin 12. The number keys 1 to 4 and 6 to 9 are positioned around the number key 5, as usual. Identifying the number 5 key allows the visually impaired user to quickly and mentally view the positions of the other number keys. In a particular implementation, there is a difference in thickness around the five key, so that, if the person loses orientation, they can return to the five key, without pressing inside the key.
The second sub-assembly includes three functional keys: a cancel key 11-1, an erase key (correction) 11-2 and a validation key 11-3. The functional keys include embossed or hollowed out patterns indicating the functions of the keys. For example, the pattern "X" represents the cancel function, the pattern "<" represents the erase function, and the pattern "O" represents the validation function.
In summary, in the plane of the upper face 17 of the plate 30, the ten numeric keys 10-0 to 10-9 are arranged in four lines and three columns, to the left of the three functional keys 11-1 to 11-3, themselves arranged on a column.
The keys of the matrix of input zones are separated from each other by a grid of profiles 13, of predetermined heights and shapes. The shapes of the profiles PI to P4 of the profile grid 13 are adapted so as to form a plurality of positioning marks for the keys of the keyboard. More specifically, the profiles form one or more breadcrumbs, which allow a visually impaired user to mentally locate the location of the keys. For example, the profiles form a peripheral breadcrumb, all around the periphery of the gripping device, making it possible to define the external volume of the gripping device. Profiles for each key also show the location of the key.
In addition, in a particular implementation, a corner of the input device (for example at the top right) is bevelled and allows the user to orient the input device, without any possible confusion.
The thickness of the plate 30 in the area of the functional keys is less than that in the area of the numeric keys. There is thus a level change between the numeric keys and the functional keys. This level change allows visually impaired people to easily locate the number and function keys.
Figure 4 is an illustration by way of example of a possible longitudinal section of the input device 1 of Figure 1, at the central keys 10-4 to
10-6 and 11-2. It illustrates an embodiment of the different profiles PI to P4 for the keys. Figure 3 also illustrates the different profiles P3 and P4 of the keys 10-1, 10-2, 10-4 and 10-5. A first PI profile makes it possible to determine the right lateral edge of the gripping device. Profile P2 of the correction key (see Figure 1) is in the form of a vertical slope. The P3 profiles of the numeric keys have an overall wave shape. They are different from the P2 profile, allowing the visually impaired user to differentiate the numeric keys from the function keys. The left external profile P4 is also different from the right external profile PI, in particular by the size of the plates (P14 vs PH), thus allowing the user to determine the orientation of the device when it is placed on the touch screen. The nipple 13 of the 5-5 key is also visible on this key and allows rapid identification of the five key.
The plate 30 is made of an electrically insulating material, so as not to emit a stray capacitance which is difficult to control.
In a particular implementation, the plate is made of rigid and transparent plastic.
Optionally, as illustrated in FIGS. 2B and 5. the lower face 18 of the plate 30 comprises, in each of its four angles, a foot 16-1 to 16-4 generally planar in thickness between 0.1 and 0, 4 mm. The feet aim to guarantee that it is the contact pads 15-1 and 15-2 which press on the touch screen 24, even if the plate 30 is slightly bent.
In a variant, the lower face comprises only two feet, those referenced 16-1 and 16-2 (that is to say those located in the two “top” angles, in the plane of the upper face of the plate ). This avoids limping of the gripping device, whether the plate is concave or convex.
Optionally, the lower face 18 of the plate 30 comprises, for example in the middle, a suction cup (40) integral with the lower face and intended to come into contact with the touch screen 24. This makes it possible to use the gripping device 1 even with a sloping touchscreen 24, and moreover, to prevent it from slipping on conventional terminals.
In another implementation, the plate 30 is made of non-conductive translucent silicone, the hardness of which is for example between 60 and 90 Shores A. Thus, the plate can deform and adapt perfectly to the flatness of the touch screen ( and therefore a priori not to require a foot). In other words, the realization of the silicone plate allows it to adhere to the touch screen, to be deformable under its weight and with a good shape memory.
The plate 30 is for example substantially the dimensions of a bank card (54 mm x 85 mm, to a few millimeters). This allows the input device 1 to be placed in a wallet or a card holder, in the same place as the bank card.
The lower corners, left and right, of the upper face 17 of the plate 3 have no keys. It is in the corresponding zones (that is to say superimposed) of the lower face 18 of the plate 30 that the two contact pads 15-1 and 15-2 are positioned.
The two contact pads 15-1 and 15-2 are very flexible and flat, so as to maximize their surface in contact with the touch screen 24. They have, for example, the shape of a disc with a diameter between 6 and 8 mm . They are for example made of conductive silicone, the hardness of which is between 40 and 80 Shores A. Other techniques can be used to make contact pads: metal parts, drawings made with conductive inks (directly on the underside of the plate, or on a film itself then transferred to the underside of the plate), etc.
The distance between the contact pads is determined and known to the terminal controller, who can thus, after having detected the two contact pads (see method described below), detect that the gripping device 1 has been affixed to the slab touchscreen 24. The controller can also deduce therefrom the position and the 180 ° modulo orientation of the input device 1 on the touchscreen 24.
In a first variant (illustrated in Figure 6). the gripping device comprises at least three contact pads 15-1, 15-2 and 15-3. Thus, the controller can detect the orientation of the input device without the 180 ° modulo. In addition, with three contact pads, there is less confusion possible with a center distance of fingers placed on the touch screen.
In a second variant (illustrated in Figure 7). the two contact pads 15-1 and 15-2 ’have different shapes (for example disc for one and rectangle for the other). Thus, the controller can also detect the orientation of the input device without the 180 ° modulo.
In a third variant (not shown), the gripping device comprises a single contact pad, having a particular shape (for example oblong or rectangular, with a sufficient length). Thus, the controller can identify the single contact pad and know its orientation (modulo 180 °); and from there also know the orientation (modulo 180 °) of the input device when it is affixed to the touch screen.
In FIGS. 2A, 3 and 4. the network of conductive tracks 19 is shown in black. It includes tracks arranged in lines 191 and in columns 19c, which form a grid over a substantial part of the upper face 17 of the plate 30.
The network of conductive tracks 19 is electrically connected to the contact pads 15-1 and 15-2 via electrical connections 14-1 (a single connection is visible in FIG. 2A) (for example sections of conductive tracks and via) . In a variant, the contact pads 15-1 and 15-2 are the thickness of the plate (in this case, the via are not necessary).
In the particular implementation illustrated, the network of conductive tracks 19 is formed in the upper part of the grid of profiles. In other words, each conductive track 19c, 191 is formed in the upper part of one of the sections PI to P4. Thus, one takes advantage of the presence of the profiles delimiting and separating the keys of the matrix of input zones.
We now present, by way of example, a set of characteristics of the network of conductive tracks 19 making it possible to have good operation with a touch screen of diagonal size between 4 ”(10.2 cm) and 7” (17 , 8 cm), with 14 lines and 24 columns, and accepting styli (therefore capable of measuring variations in small capacities).
The network of conductive tracks 19 must extend over a sufficiently large area, thus making it possible to act with more nodes of the matrix of electrodes (intersection of rows / columns) of the touch screen, and therefore to have a charge which varies during capacitive scans. This is particularly the case when the network of conductive tracks 19 is formed in the upper part of the grid of profiles and the plate 30 is substantially the dimensions of a bank card (that is to say approximately 54 mm x 85 mm).
The network of conductive tracks 19 and the underside 18 of the plate 30 are separated by a distance (height denoted el in FIG. 3) of between 1.5 mm and 4.5 mm. The conductive tracks have a width of between 0.5 mm and 2 mm.
Thus, the network of conductive tracks has a low capacity, which allows it both to interact with the touch screen during capacitive scans (and to move the charges of the network of conductive tracks, which avoids recalibration of the screen by the controller), but also not to be detected as a significant capacity variation (which would cause the false detection of a significant press).
We can make the conductive tracks narrower, but we must bring them closer to the touch screen. Conversely, they can be made larger conductive tracks, but they must be moved away from the touch screen.
It is however preferable to respect the minimum value of the height el (1.5 mm). Indeed, since the input device has a free placement on the touch screen, and that the positions of the nodes of the electrode matrix (rows / columns intersection) of the touch screen are not known, we can have an alignment perfect of a conductive track with an electrode (line or column) of the touch screen. If this is the case, and if the distance between this conductive track and this electrode is small, then the capacitance between these two elements (track and electrode) will increase significantly, which is not desirable. With the minimum value of the height el, we remain with a low capacity for the network of conductive tracks.
The maximum value of the height el (4 mm) can (in theory) be exceeded, but there, it is the ergonomics, to access the bottom of the keys, which is impacted.
In a variant, the range of values of the height el is respected, but the network of conductive tracks 19 is not formed in the upper part of the grid of profiles. It is for example formed, on the plane of the upper face 17 of the plate 30, in a zone adjoining and / or surrounding that where the keys of the matrix of input zones are located. In this case, the total surface of the plate 30 can be increased compared to the particular implementation illustrated.
The network of conductive tracks has a resistance, between contact pads, of between 20 Ω and 150 kQ. Relatively low resistance improves the reactivity of the L gripping device
Various techniques can be used to create the network of conductive tracks, in particular (but not exclusively):
• printing of the network of conductive tracks 19 (for example by pad printing with silver ink) directly on the upper parts of the profiles (which are for example made of non-conductive silicone), then addition on the conductive tracks of a non-conductive layer ( not shown), protective against abrasion (for example a non-conductive varnish);
• production of the network of conductive tracks 19 made of conductive material (for example of conductive silicone) and thick (for example having a thickness of at least 0.3 mm), then overmolding of the network of conductive tracks 19 on the grid of profiles 13 ;
• printing of the network of conductive tracks 19 on a film, then transfer of the film to the grid of profiles 13 by thermoforming and / or overmolding;
• etc.
In summary, the network of conductive tracks 19 is configured so that, when the input device 1 is affixed to the touch screen, and even in the absence of a finger being pressed on the network of conductive tracks, the network of conductive tracks interacts with the touch screen during the capacitive scanning cycles, which prevents a recalibration of the reference values (which itself would prevent each of the contact pads 151 and 15-2 from being detected as a significant support), without the network of conductive tracks 19 is itself detected as a significant support.
Indeed, we know that the capacity is defined in proportion to the facing surface, and inversely in proportion to the distance of insulation. Consequently, the contact pads 15-1 and 15-2, very close to the electrodes of the touch screen 24, have a measurable capacity (of the order of a stylus), allowing them to be detected each as a support. significant, while the network of conductive tracks 19 (height and greater, and with fine conductive tracks) has a much lower capacity, allowing it not to be detected as a significant support.
But the network of conductive tracks 19 has another important characteristic: it extends over a larger surface than the contact pads, and therefore, even if its capacity is low, it interacts with several nodes of the electrode matrix ( lines / columns intersection) of the touch screen. The fact that the conductive tracks are connected in a network allows charges to circulate there freely. Thus, during capacitive scans, charges come and go in the network of conductive tracks, as well as between the contact pads and the network of conductive tracks. This therefore very slightly changes the load on the network of conductive tracks and contact pads. Consequently, for the nodes concerned of the matrix of electrodes (that is to say those located opposite the network of conductive tracks and contact pads), the controller measures variations in capacitance (with respect to values ) which are not fixed on successive cycles, and therefore decides not to recalibrate the touch screen (that is to say, to modify the reference values for the nodes concerned). This non-recalibration allows each of the contact pads 15-1 and 15-2 to continue to be detected as significant support.
In addition, the proposed design (network of conductive tracks 19 electrically connected to the contact pads 15-1 and 15-2) has the advantage of having an important dynamic for the detection of the contact pads:
• in the second phase of code entry (which follows the first phase of detection of the input device, even without pressing a finger on the network of conductive tracks), that is to say when the finger of the user presses on the key zones (and therefore is in contact with them), or • in the first detection phase of the input device, if the user's finger is near the network of conductive tracks.
5.3 Second embodiment of the input device
FIG. 10 illustrates a data entry device 100, according to a variant of the first embodiment of the invention, in “portrait” format, particularly suitable for use with touch screens also of “small format” portrait type (for which, the data entry device 1 of the first embodiment, in “landscape” format, would not be usable). Its operation is exactly the same as that of the first embodiment.
More precisely, in the plane of the upper face 17 of the plate 30, the ten numeric keys 10-0 'to 10-9' (always on four lines and three columns) are arranged above (and no longer on the left) of the three functional keys 11-1 'to 113', themselves arranged on a line (and no longer on a column).
The lower corners, left and right, of the upper face 17 of the plate 3 have no keys. It is in the corresponding zones (that is to say superimposed) of the lower face 18 of the plate 30 that the two contact pads 15-1 ’and 15-2’ are positioned.
The spacing between contact pads is not the same as in the first embodiment. Thus, the terminal controller, who knows the distance between the contact pads of each of the types of input device 1, 100, can detect which type of input device has been affixed to the touch screen (and thereby deduce the position of each of the keys of the appended input device).
In addition, in a particular implementation, a corner of the input device (for example at the top right, see FIG. 10) is bevelled and allows the user to orient the input device, without any possible confusion. This prevents the user from placing the gripping device horizontally.
5.4 Example of terminal structure
FIG. 8 shows an example of the structure of terminal 2 of FIG. 1, implementing a data entry method according to the invention (for example the particular embodiment described below in relation to FIG. 9).
The terminal 2 comprises a touch screen 24 (see description above), a random access memory 22 (for example a RAM memory), a processing unit 61 (forming in particular the controller (control unit) of the touch screen 24; see description above), equipped for example with a processor, and controlled by a computer program
230 stored in a read only memory 23 (for example a ROM memory or a hard disk). On initialization, the code instructions of the computer program 230 are for example loaded into the random access memory 22 before being executed by the processor of the processing unit 21.
This FIG. 8 illustrates only one particular way, among several possible, of carrying out the algorithm detailed below in relation to FIG. 9. In fact, the technique of the invention is carried out indifferently on a reprogrammable calculation machine (a computer PC, a DSP processor or a microcontroller) executing a program comprising a sequence of instructions, or on a dedicated computing machine (for example a set of logic gates such as an FPGA or an ASIC, or any other hardware module). In the case where the invention is installed on a reprogrammable computing machine, the corresponding program (that is to say the sequence of instructions) may be stored in a removable storage medium (such as for example a floppy disk, CD-ROM or DVD-ROM) or not, this storage medium being partially or completely readable by a computer or a processor.
5.5 Example of input process
FIG. 9 presents a flow diagram of a method according to a particular embodiment of the invention, executed by the terminal 2.
In a step 91 (first detection), the terminal detects an apposition of the data entry device 1 on the touch screen 24. This first detection is based on a detection of the contact pad (s) 15-1 and 15-2.
When affixing the gripping device 1 to the touch screen, the touch screen controller detects the two (or three) contact pads, and possibly one or more significant presses if the user holds the gripping device in hand and one of his fingers touches the touch screen. As explained above, this detection is possible because the contact pads are electrically conductive and in direct contact with the touch screen. The level of detection of contact pads is acceptable because it is lower than if pressed with a finger, but at a level comparable to that of a stylus. As a reminder, the network of conductive tracks is not detected but makes it possible to avoid recalibration of the touch screen (which would prevent the detection of contact pads).
In addition, the gap (s) between contact pads being known to the controller (with a few variations), the latter is able to recognize that it is an input device 1 that has been installed.
The controller also determines the position and orientation of the input device 1 on the touch screen. For orientation, it is according to the number of contact pads that the input device has:
• with three contact pads, the controller knows how to orient the input device:
• with two contact pads, the orientation is modulo 180 °. The controller then checks that at least one position of the input device makes it possible to have a functional keyboard.
In a particular implementation, the controller also verifies that each of the input zones (keys) 10-0 to 10-9 and 11-1 to 11-3 is present at least partially in an active zone of the touch screen 24. We consider for example that if 80% of a key is in the active area, then it is still acceptable.
Each user can have their own grip on the input device. Indeed, some people can pin it, others just press the keys (without holding the input device), others still hold it with two fingers and press the keys. It is therefore extremely important not to consider as significant supports, the supports which are outside the keyboard, while identifying which are the supports of the contact pads (which orient the keyboard):
• first solution: the touch screen controller records all the points detected. With all these points, the controller (or the terminal microprocessor if not confused with the controller) defines which points are detected which correspond to the contact pads of the input device, and determines the orientation of the device. input (and therefore the keyboard). The controller then filters the other detected points: either as having to be taken into account, or as having to be forgotten (because corresponding to the grip fingers). The corollary is that the more we are able to acquire detected points, the more tolerant we are on points detected off the keyboard. In addition, the fact of using three contact pads makes it possible to get rid of “false gripping devices”, such as for example the fact of holding the gripping device with two fingers spaced from the center distance provided between two contact pads .
• second solution: the controller keeps in memory the positions of the contact pads during installation (it is assumed that there is a reduced number of “parasitic” fingers during this installation). In this case, with these memorized positions, and considering that the movements of the gripping device can only be slow (less than 40 mm / s, for example), confusion of position is avoided.
In a step 92, if the determinations and verifications of step 91 have been carried out successfully, the terminal switches to an input mode suitable for the data input device (hereinafter called "blind mode"). To acknowledge the good presence of the input device and confirm to the user the switch to blind mode, an audible notification is issued by the terminal. In addition, in order to secure the next phase of data entry, the terminal erases the virtual keyboard on the touch screen. In addition, in the blind mode, the setting of the touch screen is for example such that it makes it possible to detect lower levels when entering the PIN code. This makes it possible to compensate, if necessary, for the fact that the user's finger is in contact with the touch screen 24 via the input device 1.
In a step 93 (second detection), the terminal detects data entry by the user. This second detection is based on the detection of one or more finger presses by the user on the keys of the input device. Typically, for entering a confidential code (PIN code), the controller detects four successive presses on the number keys 10-0 to 10-9, followed by pressing the validation key 11-3. When you exit entering the PIN code, you switch back to a standard setting ("normal mode").
Entering a key in blind mode respects for example the following rules, managed by the controller:
• any support outside the template of the input device is filtered (that is to say not retained as a significant support). This may, in particular, be due to the user who holds the gripping device, or has palm effects;
• the selection of the key is made when the finger is removed (if one is in the same key as before);
• the supports below are filtered at a certain reference duration (for example between 1000 and 3000 ms). This notably allows the user to search for point five, without activating it, and then to enter their code. On the other hand, for a press greater than the reference duration, the pressed key is considered to be pressed (significant press) and there is an audible (or tactile) feedback;
• if two or more keys are pressed simultaneously (which may be the case when a blind person searches for the keys, or of a person identifying himself “by column”) then the presses are ignored;
• any key press is acknowledged by an audible (or tactile) feedback (this acknowledgment signal is for example identical, regardless of which key is pressed). Another way to filter the supports is to have a force detection. In this case, it is not necessary to have a filtering on the duration of support. In addition or not to the force detection, you can add a haptic effect to the keyboard.
Exiting blind mode can be done in several ways. If a contact pad is no longer detected by the controller or if the controller detects that the keys are no longer in the active area of the touch screen, the user is notified, for example by a “negative” sound feedback ( long serious) that you exit blind mode, and return to a display according to classic mode.
If the user has finished entering his code and the code is correct, a “positive” notification is sent (for example of the “double short acute” type), otherwise (false code) a “negative” notification is sent ( for example of the “triple grave long” type). Thus, to identify different messages, we use signals having not only a different frequency (note), but also a different rhythm.
With the proposed method, the input device can move and we are still able to detect it (with its orientation) and therefore define the key (s) pressed. In addition, you can even remove the input device and then reposition it differently on the touch screen (even rotated 180 °), and it continues to work.

权利要求:
Claims (20)
[1" id="c-fr-0001]
1. Data entry device (1) intended to be affixed to a touch screen (24) of a terminal (2), said touch screen being capacitive, comprising row and column electrodes forming an electrode matrix comprising nodes, and being controlled by a control unit (21) configured to perform cycles of capacitive scanning and measuring variations in the capacity of the nodes with respect to reference values, detecting significant presses on the touch screen as a function of the measured capacity variations, and recalibrate the reference values as a function of the measured capacity variations, characterized in that it comprises:
• a generally parallelepipedic plate (30) comprising a generally planar lower face (18) for affixing the device to the touch screen, and an upper face (17) comprising a matrix of input zones (10-0 to 10- 9 and 11-1 to 11-3) forming a keyboard, the input zones having a thickness (e2) configured to allow detection of a finger by the touch screen when the device is affixed to the touch screen;
• at least one contact pad (15-1 to 15-3), flat, electrically conductive and integral with the underside; and • a network of conductive tracks (19), extending over at least part of the upper face and being electrically connected to said at least one contact pad, so that when the device is affixed to the touch screen, and even in the absence of a finger pressing on the network of conductive tracks, the network of conductive tracks interacts with the touch screen during the capacitive scanning cycles, which prevents a recalibration of the reference values which itself would prevent that said at least one contact pad is detected as a significant support, without the network of conductive tracks itself being detected as a significant support.
[2" id="c-fr-0002]
2. Device according to claim 1, characterized in that the lower face comprises at least two contact pads (15-1 to 15-3).
[3" id="c-fr-0003]
3. Device according to claim 2, characterized in that said at least two contact pads (15-1, 15-2 ’) have different shapes.
[4" id="c-fr-0004]
4. Device according to claim 1, characterized in that the lower face comprises at least three contact pads (15-1 to 15-3).
[5" id="c-fr-0005]
5. Device according to any one of claims 1 to 4, characterized in that the matrix of input areas forming a keyboard comprises a set of input keys which are generally planar, formed on the upper surface and separated from each other by a grid profiles (PI to P4) of predetermined heights and / or shapes, and in that the network of conductive tracks (19) is formed in the upper part of the grid of profiles.
[6" id="c-fr-0006]
6. Device according to any one of claims 1 to 5, characterized in that the network of conductive tracks (19) and the lower face (18) are separated by a distance (el) between 1.5 mm and 4, 5 mm, and in that the conductive tracks have a width of between 0.5 mm and 2 mm.
[7" id="c-fr-0007]
7. Device according to any one of claims 1 to 6, characterized in that the lower face comprises at least two contact pads, and in that the network of conductive tracks has a resistance, between contact pads, between 20 Ω and 150 kQ.
[8" id="c-fr-0008]
8. Device according to any one of claims 1 to 7, characterized in that the network of conductive tracks (19) is printed on the upper face and covered with a non-conductive layer, protective against abrasion.
[9" id="c-fr-0009]
9. Device according to any one of claims 1 to 7, characterized in that the network of conductive tracks is made of thick conductive material having a thickness of at least 0.3 mm.
[10" id="c-fr-0010]
10. Device according to any one of claims 1 to 9, characterized in that the plate (30) consists of an electrically insulating material.
[11" id="c-fr-0011]
11. Device according to any one of claims 1 to 10, characterized in that the plate (30) is made of rigid and transparent plastic.
[12" id="c-fr-0012]
12. Device according to claim 11, characterized in that the lower face (18) has four angles and comprises, in at least two adjacent angles among said angles, a foot (16-1 to 16-4) generally planar in thickness between 0.1 and 0.4 mm.
[13" id="c-fr-0013]
13. Device according to any one of claims 1 to 10, characterized in that the plate (30) is made of translucent silicone, making it possible to deform and adapt perfectly to the flatness of the touch screen.
[14" id="c-fr-0014]
14. Device according to any one of claims 1 to 13, characterized in that it comprises at least one suction cup (40), integral with the lower face and intended to come into contact with the touch screen.
[15" id="c-fr-0015]
15. Device according to any one of claims 1 to 14, characterized in that the plate (30) is substantially the dimensions of a bank card, in length and width.
[16" id="c-fr-0016]
16. Device according to any one of claims 1 to 15, characterized in that the matrix of input zones (10-0 to 10-9 and 11-1 to 11-3) forming a keyboard is representative of a keyboard of entry of a confidential code on a payment terminal.
[17" id="c-fr-0017]
17. Terminal (2) comprising a capacitive touch screen (24), comprising row and column electrodes forming an electrode array comprising nodes, and a control unit (21), configured to perform capacitive scanning cycles and of measuring the variations in the capacity of the nodes with respect to reference values, detecting significant presses on the touch screen as a function of the measured variations in capacity, and recalibrating the reference values as a function of the measured variations in capacity, said terminal being characterized in that said control unit is configured to further perform:
• a first detection (91), of an apposition of a data entry device according to any one of claims 1 to 16 on the touch screen, said first detection being based on a detection of said at least one chip of contact ; and • a second detection (93), of an input by a user of at least one data item, said second detection being based on a detection of at least one finger press of said user on one of the input zones forming keyboard.
[18" id="c-fr-0018]
18. Method for entering data on a touch screen (24) of a terminal (2), characterized in that it comprises the following steps:
• first detection (91), by the terminal, of an apposition of a data entry device according to any one of claims 1 to 16 on the touch screen, said first detection being based on a detection of said at least a contact pad; and • second detection (93), by the terminal, of an input by a user of at least one data item, said second detection being based on a detection of at least one finger press of said user on one of the zones keyboard.
[19" id="c-fr-0019]
19. The method of claim 18, characterized in that said first detection (91) is also based on a verification that each of the input areas is present at least partially in an active area of the touch screen.
[20" id="c-fr-0020]
20. Method according to any one of claims 18 and 19, characterized in that it comprises, after the first detection step (91) and before the second detection step (93), a tilting step (92) of the terminal in an input mode adapted to the data input device.

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公开号 | 公开日

EP3582090A1|2019-12-18|

ES2845250T3|2021-07-26|

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US20200026392A1|2020-01-23|

引用文献:

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法律状态:
2019-06-27| PLFP| Fee payment|Year of fee payment: 2 |

2019-12-20| PLSC| Publication of the preliminary search report|Effective date: 20191220 |

2020-06-29| PLFP| Fee payment|Year of fee payment: 3 |

2021-06-24| PLFP| Fee payment|Year of fee payment: 4 |

2022-01-07| TP| Transmission of property|Owner name: BANKS AND ACQUIRERS INTERNATIONAL HOLDING, FR Effective date: 20211202 |

优先权:

申请号 | 申请日 | 专利标题

FR1855293A|FR3082641B1|2018-06-15|2018-06-15|DATA ENTRY DEVICE INTENDED TO BE APPLIED TO A TOUCH PANEL OF A TERMINAL, CORRESPONDING ENTRY PROCESS AND SYSTEM.|

FR1855293|2018-06-15|FR1855293A| FR3082641B1|2018-06-15|2018-06-15|DATA ENTRY DEVICE INTENDED TO BE APPLIED TO A TOUCH PANEL OF A TERMINAL, CORRESPONDING ENTRY PROCESS AND SYSTEM.|

US16/439,152| US10884565B2|2018-06-15|2019-06-12|Device for the entry of data to be placed on a touch panel of a terminal, corresponding method and entry system|

ES19179642T| ES2845250T3|2018-06-15|2019-06-12|Data input device intended to be applied to a touch panel of a corresponding input terminal, procedure and system|

EP19179642.4A| EP3582090B1|2018-06-15|2019-06-12|Device for entry of data designed to be affixed to a touchpad of a terminal, corresponding input method and system|

CA3046511A| CA3046511A1|2018-06-15|2019-06-13|Data entry device to be apposed on a terminal touchscreen, corresponding process and entry system|

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