Touch type lcd device

专利摘要:
The present invention discloses a touch type liquid crystal display device incorporating a photodiode to replace the function of a touch screen. The disclosed touch type liquid crystal display device includes: a transparent insulating substrate; Several gate lines and data lines intersected to define a unit pixel area on the substrate; A common electrode line disposed in the pixel area in parallel with the gate line; Several thin film transistors disposed at each intersection of the gate line and the data line; A pixel electrode disposed in each pixel region defined by the gate line and the data line; And a photodiode provided in each pixel area and configured to determine an external signal input position by receiving an optical signal from the outside and flowing a photocurrent, wherein the photodiode is a light incident from the rear of the display device. A light shielding pattern formed together with the gate line, an active layer disposed on the light shielding pattern through a gate insulating layer, and a protective layer formed on the active layer; And first and second electrodes disposed on one side and the other side of the active layer, respectively contacting the gate line and the data line, and an ohmic contact layer interposed between the active layer and the first and second electrodes.
公开号:KR20030028973A
申请号:KR1020010061430
申请日:2001-10-05
公开日:2003-04-11
发明作者:김철하
申请人:비오이 하이디스 테크놀로지 주식회사；
IPC主号:

专利说明:

Touch LCD Device {TOUCH TYPE LCD DEVICE}
[15] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a touch type liquid crystal display device in which a photodiode in place of a function of a touch screen is incorporated in each pixel area.
[16] The flat panel display includes a display using plasma, a display using liquid crystal, and a display using light emitting diodes. Such a flat panel display displays an image by synchronizing an image signal received from a host according to horizontal and vertical synchronization signals.
[17] In this way, the flat panel display device displaying the video signal generated from the host uses the control key to control the function. The control key has a main function of inputting information, and in the past, it has been mainly reliant on a keyboard or a mouse. However, in recent years, the use of a touch screen has become widespread due to its easy handling and simplicity.
[18] The touch screen technology is a technology for identifying a location from an external input signal by a user's touch without displaying information by a mouse or a keyboard and displaying an image according to the touch screen. Doing.
[19] Meanwhile, the touch screen uses various location recognition methods to recognize a location from an external input signal. For example, a resistive touch screen, a capacitive touch screen, and an acoustic wave touch screen. An acoustic wave toouch screen, an infrared touch screen, or an electromagnetic induction touch screen is applied.
[20] FIG. 1 is a diagram illustrating an infrared touch screen, and as shown, the infrared touch screen 30 has a light emitting diode 22 for generating infrared light between two substrates spaced apart from each other and has a left edge and an upper edge. And a light detector 24 for detecting infrared rays on the right and bottom edges thereof.
[21] In this infrared touch screen 10, when pressure is applied to the touch screen by user's hand operation from the outside, the light emitted from the light emitting diode 2 is blocked by the pressure to press the touch screen, and at this time, Infrared detection by the X and Y axis light receiving sensors 4 of the light receiving unit is blocked to detect the X and Y positions.
[22] However, the conventional touch screen including the infrared touch screen as described above has to be installed on the front of the display device, which is not only troublesome, but also difficult in handling.
[23] In addition, since a separate touch screen is installed in the display device, there is an unfavorable problem in terms of price.
[24] Accordingly, an object of the present invention is to provide a touch type liquid crystal display device capable of operating in a touch type, even though the installation of the touch screen is omitted in order to solve the conventional problems as described above.
[1] 1 illustrates a conventional infrared touch screen.
[2] 2 is a plan view illustrating a thin film transistor array substrate of a touch type liquid crystal display device having a photodiode according to an exemplary embodiment of the present invention.
[3] 3 is a cross-sectional view taken along the line AA ′ of FIG. 2.
[4] 4 is a cross-sectional view taken along the line BB ′ of FIG. 2.
[5] -Explanation of symbols for the main parts of the drawing-
[6] 1: glass substrate 2: gate line
[7] 2a: gate electrode 3: shading pattern
[8] 4 common electrode line 6 gate insulating film
[9] 8a: channel layer 8b: active layer
[10] 10a, 10b: protective layer 12: ohmic contact layer
[11] 14 pixel electrode 16 data line
[12] 16a: source electrode 16b: drain electrode
[13] 16c: first electrode 16d: second electrode
[14] TFT: Thin Film Transistor PD: Photodiode
[25] Touch type liquid crystal display device of the present invention for achieving the above object, the transparent insulating substrate; Several gate lines and data lines intersected to define a unit pixel area on the substrate; A common electrode line disposed in the pixel area in parallel with the gate line; Several thin film transistors disposed at each intersection of the gate line and the data line; A pixel electrode disposed in each pixel region defined by the gate line and the data line; And a photodiode provided in each pixel area and configured to determine an external signal input position by receiving an optical signal from the outside and flowing a photocurrent, wherein the photodiode is a light incident from the back of the display device. A light shielding pattern formed together with the gate line, an active layer disposed on the light shielding pattern through a gate insulating layer, and a protective layer formed on the active layer; And first and second electrodes disposed on one side and the other side of the active layer, respectively contacting the gate line and the data line, and an ohmic contact layer interposed between the active layer and the first and second electrodes.
[26] A light blocking pattern formed with the gate line; An active layer formed on the light blocking pattern; First and second electrodes disposed on one side and the other side of the active layer while being in contact with the gate line and the data line, respectively; And a channel protective layer formed on the active layer.
[27] According to the present invention, since the installation of the touch screen is omitted, troublesome manufacturing process can be solved, and the problem of price increase can also be solved.
[28] (Example)
[29] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[30] 2 is a plan view illustrating an array substrate of a touch type liquid crystal display according to an exemplary embodiment of the present invention.
[31] As shown, several gate lines 2 and data lines 16 intersect with each other to define unit pixel regions, and a common electrode line 4 is disposed in parallel between adjacent gate lines 2, respectively. Is placed. A gate insulating film (not shown) is interposed between the gate line 2, the common electrode line 4, and the data line 16, and the gate line 2 and the common electrode line 4 are interposed by the gate insulating film. And the data line 16 are electrically insulated.
[32] A thin film transistor TFT, which is a switching element, is disposed at each intersection of the gate line 2 and the data line 14, and a pixel electrode 14 made of a transparent metal film such as ITO is disposed in each pixel region.
[33] 3, the thin film transistor TFT includes a gate electrode 2a which is a part of the gate line 2 formed on the substrate 1, and the gate on the gate electrode 2a. The channel layer 8a disposed under the insulating film 6, the protective layer 10a formed on the channel layer 8a, and drawn out from the data line 16 on one side of the channel layer 8a. A drain electrode 16b disposed, a source electrode 16a disposed on the other side of the channel layer 8a and in contact with the pixel electrode 14, and the channel layer 8a and a source / drain electrode ( And an ohmic contact layer 12 interposed between 16a and 16b.
[34] Subsequently, a photo diode (PD) is disposed in each pixel region. The photodiode PD converts an optical signal into a photocurrent, and as shown in FIG. 4, a light shielding pattern 3 for blocking light incident from a rear surface of the display device, and the light shielding pattern 3. An active layer 8b formed on the active layer 8b, a protective layer 10b formed on the active layer 8b, and a gate line 2 and a data line 16 disposed on one side and the other side of the active layer 8b, respectively. First and second electrodes 16c and 16d contacted, respectively, and an ohmic contact layer 12 disposed between the first and second electrodes 16c and 16d and the active layer 8b.
[35] The photodiode PD is formed together with the thin film transistor TFT. In detail, the light blocking pattern 3 is formed together when the gate line 2 is formed, and the active layer 8b is formed together with the channel layer 8a of the thin film transistor TFT, and the first and second electrodes are formed. 16a and 16d are formed together with the date line 16. In addition, the protective layer 10b is formed together with the protective layer 10a in the thin film transistor TFT, and in particular, the electrical connection between the first electrode 16c and the gate line 2 is a contact to the gate insulating film 6. Through hole formation.
[36] As described above, the liquid crystal display of the present invention in which the photodiode PD is built in each pixel may be operated as follows.
[37] First, when the optical signal is not input from the outside, that is, when there is no input of the optical signal by the use of the optical recording pen of the user, the operation of the photodiode PD is not performed, but only the gate line 2 and the data. Only the operation of the thin film transistor TFT that applies data to the pixel via the line 16 is performed.
[38] On the other hand, when an optical signal is input to a specific pixel by the user's optical recording pen from the outside, the photodiode PD provided in the pixel receives an optical signal from the optical recording pen and flows a photocurrent. The optical current flowing through the gate line 2 and the data line 16 is decoded in an arbitrary circuit unit to recognize the X and Y positions of a specific pixel selected by the optical recording pen. In addition, a thin film transistor (TFT) operation of a corresponding pixel is performed through the gate line 2 and the data line 16, thereby displaying a predetermined image.
[39] In detail, when light is incident on the optical recording pen from the outside, the photodiode is activated, and a large photocurrent flows in this process. At this time, in order to recognize the position through the current, when the m-th data voltage is increased immediately before driving the n-th gate line, a large current flows through the photodiode. The location can be determined.
[40] In addition, after the position is decoded, the gate voltage is applied to the on state and the data signal voltage is applied so that data can be applied to the pixel where the n-th gate line and the m-th data line meet. Detection can be performed simultaneously.
[41] Therefore, the liquid crystal display of the present invention includes a photodiode capable of receiving an optical signal and flowing a photocurrent in each pixel, thereby operating as a touch type capable of identifying an image and an external input position without installing a separate touch screen. This becomes possible.
[42] Meanwhile, in the exemplary embodiment of the present invention, only the case where the present invention is applied to a liquid crystal display device is illustrated and described. However, the present invention may be applied to a display device using a plasma and a light emitting diode as well as the liquid crystal display device.
[43] As described above, the liquid crystal display device of the present invention can be used as a touch type by installing a photodiode on each pixel even without the installation of a touch screen. You can solve the problem.
[44] In addition, the liquid crystal display device of the present invention can be driven using not only an optical recording pen but also straight light such as a laser pointer, so that position input at a long distance can be performed.
[45] In addition, the liquid crystal display device of the present invention can omit the installation of the touch screen, and thus the application to the portable touch display device is possible.
[46] Meanwhile, although specific embodiments of the present invention have been described and illustrated, modifications and variations can be made by those skilled in the art. Accordingly, the following claims are to be understood as including all modifications and variations as long as they fall within the true spirit and scope of the present invention.

权利要求:
Claims (3)
[1" claim-type="Currently amended] Transparent insulating substrates;
Several gate lines and data lines intersected to define a unit pixel area on the substrate;
A common electrode line disposed in the pixel area in parallel with the gate line;
Several thin film transistors disposed at each intersection of the gate line and the data line;
A pixel electrode disposed in each pixel region defined by the gate line and the data line; And
And a photodiode provided in each of the pixel areas to determine an external signal input position by receiving an optical signal from the outside and flowing a photocurrent.
[2" claim-type="Currently amended] The method of claim 1, wherein the photodiode
A light blocking pattern formed together with the gate line to block light incident from a rear surface of the display device;
An active layer disposed on the light blocking pattern with a gate insulating layer interposed therebetween;
A protective layer formed on the active layer;
First and second electrodes disposed on one side and the other side of the active layer, respectively contacting the gate line and the data line; And
And an ohmic contact layer interposed between the active layer and the first and second electrodes.
[3" claim-type="Currently amended] The touch type liquid crystal display of claim 1, wherein the external input of the optical signal is performed by an optical recording pen or a laser pointer.

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同族专利:

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公开号 | 公开日

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2001-10-05|Application filed by 비오이 하이디스 테크놀로지 주식회사

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2001-10-05|Priority to KR1020010061430A

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2003-04-11|Publication of KR20030028973A

优先权:

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申请号 | 申请日 | 专利标题

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KR1020010061430A|KR20030028973A|2001-10-05|2001-10-05|Touch type lcd device|