• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    PURPOSE: A display device is provided to commonly use signal lines driven by a common driving circuit in the first and second display devices, and to implement low power consumption by selectively or simultaneously displaying images with the two display devices, thereby enabling a high-quality image display. CONSTITUTION: The second display device(PNL2) is configured with smaller signal lines than those of the first display device(PNL1). Signal lines driven by a common driving circuit(DR) are commonly used in signal lines(DLm) of the first display device(PNL1) and signal lines(DLs) of the second display device(PNL2). Images are selectively or simultaneously displayed by using the two display devices(PNL1,PNL2). When displaying the images with the first and second display devices(PNL1,PNL2), an N line(N is a fixed number from 1) reverse driving mode is set, while a frame reverse driving mode is set when the images are displayed with the second display device(PNL2) only.
    公开号:KR20040042901A
    申请号:KR1020030080651
    申请日:2003-11-14
    公开日:2004-05-20
    发明作者:쯔유끼다까시；다까하시히로유끼
    申请人:가부시키가이샤 히타치 디스프레이즈；
    IPC主号:
    专利说明:

    Display device {DISPLAY DEVICE}
    [21] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more particularly to an image display device having a display device having two display screens having different amounts of display data, thereby enabling the display of images alternatively or simultaneously to each display device. will be.
    [22] In a small apparatus such as a portable information terminal such as a cellular phone, apart from a screen displaying main use information such as communication information or content information, it is possible to display simple information such as time display, status information and operation information of the apparatus, and the like. By providing a screen, it is expected to achieve convenience and power saving. For example, in a standby state in which screens are provided on two sides of the main body, such as a folding type mobile phone, the display data amount is small, and only a small size and a low power consumption screen are in an operating state. By operating the screen of the display data amount, it is possible to reduce the power consumption as a whole.
    [23] Conventionally, in an image display device having two screens of this kind, the display device constituting each screen is driven using a separate signal line driver circuit. However, in order to assemble two display devices driven independently of each other in a cellular phone or the like, there is a limited internal volume of the housing and a circuit for driving the driving circuits corresponding to the use states is complicated. This results in high cost.
    [24] On the other hand, by making the signal line driver circuit common, it is possible to realize miniaturization, light weight, and low power of an applied device. For example, in the liquid crystal display device disclosed in Japanese Patent Laid-Open No. 2001-67049, two display devices having different display capacities (number of signal lines) are used in which the first and second liquid crystal display panels in which the number of signal lines are different are larger. Signal lines are extended to the lesser liquid crystal display panels so that the signal lines are common, and each liquid crystal display panel is driven by a common signal line driver circuit.
    [25] However, in the above-described image display device, since some signal lines of the first display device having a large display capacity are extended to be shared with the signal lines of the second display device having a small display capacity, the wiring resistance of the signal line, stray capacitance, pixels The capacitance (liquid crystal capacitance in the liquid crystal display device) and the like are different from each other in the first display device and the second display device. Therefore, when performing display in the display area of the first display device, so-called vertical smear occurs at the boundary between the display portion of the signal line shared with the second display device and the display portion of the other signal line, thereby degrading the image quality. Solving this was one of the challenges.
    [26] An object of the present invention is to reduce the power consumption by making a signal line driven by a common driving circuit common to both the first and second display devices, and displaying the images alternatively or simultaneously with the two display devices. In addition, the present invention provides a low power consumption image display device capable of suppressing the vertical smear generated in the first display device to enable high quality image display.
    [1] 1 is a plan view schematically illustrating the configuration of an embodiment of an image display device according to the present invention.
    [2] Fig. 2 is a waveform diagram illustrating a main signal output from a driving circuit in the frame inversion driving mode in the embodiment of the present invention.
    [3] Fig. 3 is a waveform diagram illustrating a main signal output from a driving circuit in the N line inversion driving mode in the embodiment of the present invention.
    [4] 4 is a block diagram illustrating a configuration example of a control device in the image display device according to the present invention.
    [5] 5 is a plan view schematically illustrating a configuration of another embodiment of an image display device according to the present invention.
    [6] 6 is a plan view schematically illustrating a configuration of another embodiment of the image display device according to the present invention.
    [7] 7 is a plan view schematically illustrating a configuration of another embodiment of the image display device according to the present invention.
    [8] 8 is an exploded perspective view illustrating a configuration example of a liquid crystal display module using the liquid crystal display device according to the present invention.
    [9] 9 is a plan view illustrating an appearance of a configuration example of a liquid crystal display module using the liquid crystal display device according to the present invention.
    [10] <Explanation of symbols for the main parts of the drawings>
    [11] PNL1: first display device
    [12] PNL2: second display device
    [13] SUB1m, SUB1s: first substrate
    [14] SUB2m, SUB2s: Second Board
    [15] DLm, DLs: signal line
    [16] GLm, GLs: Gate Line
    [17] FPC1: Flexible Printed Board
    [18] DR: drive circuit
    [19] M: memory
    [20] FPC2: Flexible Printed Board
    [27] According to one aspect of the present application, in a liquid crystal display device, a plurality of first scanning lines and a plurality of first signal lines are arranged in a matrix shape on a substrate, and are connected to a first portion connected to an intersection of the first scanning line and the first signal line. A first display device in which a plurality of first pixels having switching elements are formed, and a plurality of second scan lines and a plurality of second signal lines are arranged in a matrix shape on a substrate, and at an intersection of the second scan line and the second signal line. And a second display device in which a plurality of second pixels having connected second switching elements are formed, and a display control device for controlling display operations of the first display device and the second display device, wherein the second display device is provided. The number of the second signal lines of is less than the number of the first signal lines of the first display device, the second signal line of the second display device is connected to the first signal line of the first display device, and the display agent The apparatus displays the image by driving the first display device in the first display mode, and displays the image by driving the second display device in either one of the drive of the first display mode and the drive of the second display mode. It is characterized by.
    [28] According to another aspect of the present application, there is provided an image display device having two display devices with a second display device composed of fewer signal lines than the first display device, wherein the signal lines driven by the common driving circuit are connected to the first and the second display devices. Both display devices are common, and the two display devices can display images either alternatively or simultaneously, so that only the first display device and the two display devices of the first display device and the second display device are both displayed. In the case of the display, the N line (N is an integer from 1) inverted driving mode is used, and in the display using only the second display device, the display is displayed in the frame inverted driving mode.
    [29] With such a configuration, when performing display only on the first display device or display on the first display device and the second display device, the first display device side is affected by the pixel capacity of the second display device, the wiring resistance, and the like. Can be suppressed by making the vertical smear generated in the N line inversion driving mode, that is, N line AC driving. When the display is performed only by the second display device, power consumption can be suppressed by switching to the frame inversion driving mode, that is, the frame alternating current driving.
    [30] Therefore, the configuration can be simplified by using a single driving circuit for driving each of the first and second display devices, and the low power consumption can be achieved by setting the display mode in the second display device composed of fewer signal lines as the frame inversion driving mode. This is realized.
    [31] In addition, this invention is not limited to the structure of the said structure and the Example mentioned later, A various change is possible without deviating from the technical idea of this invention, and the active-matrix type liquid crystal display which used the thin film transistor as an active element. It goes without saying that the present invention can be similarly applied to an apparatus, an organic EL display device, and an image display device using other known active elements.
    [32] <Embodiment>
    [33] EMBODIMENT OF THE INVENTION Hereinafter, specific embodiment of this invention is described in detail with reference to drawings of an Example. In the drawings referred to in the following description, those having the same function are denoted by the same reference numerals, and redundant descriptions are omitted as much as possible. In the following embodiments, a liquid crystal display device using a thin film transistor as an active element will be described as an example.
    [34] 1 is a plan view schematically illustrating the configuration of an embodiment of an image display device according to the present invention. Reference numeral PNL1 denotes a first display device, and is configured by sandwiching a liquid crystal layer between the first substrate SUB1m and the second substrate SUB2m. Also referred to as a plurality of signal lines (data lines or drain lines) extending in the vertical direction (hereinafter referred to as the y-direction) and arranged in the horizontal direction (hereinafter referred to as the x-direction) on the main surface of the first substrate SUB1m, that is, the inner surface facing the second substrate SUB2m. ) Has DLm. The main surface of the first substrate SUB1m, that is, the inner surface of the second substrate SUB2m opposite to the second substrate SUB1m, has a plurality of scanning lines (gate lines) GLm extending in the x direction and arranged in the y direction.
    [35] Reference numeral PNL2 denotes a second display device, and a liquid crystal layer is sandwiched between the first substrate SUB1s and the second substrate SUB2s. The main surface of the first substrate SUB1s, that is, the inner surface facing the second substrate SUB2s, has a plurality of signal lines (also referred to as data lines or drain lines) DLs extending in the y direction and arranged in the x direction. The signal lines DLs are connected to a part of the signal lines DLm of the first display device PNL1 (plural on the left side in FIG. 1) and are wired in an extended state via the flexible printed circuit board FPC1. In addition, the main surface of the first substrate SUB1s, that is, the inner surface of the second substrate SUB2s, has a plurality of gate lines GLs extending in the x direction and arranged in the y direction. This gate line GLs is wired on the first substrate SUB1m of the first display device PNL1 via the flexible printed circuit board FPC1.
    [36] The gate line GLs of the second display device PNL2 and the gate line GLm of the first display device PNL1 are driven by a scan line driving circuit built in the driving circuit DR. The number of gate lines GLs of the second display device PNL2 is smaller than the number of gate lines GLm of the first display device PNL1. In this embodiment, the resolution (precision) of the first display device and the second display device are the same, and the screen size of the second display device PNL2 is described as smaller than the screen size of the first display device PNL1. The resolution may be coarse, or on the contrary, may be more precise than that of the first display device.
    [37] Here, the number n of signal lines DLs of the second display device PNL2 is less than the number m of signal lines DLm of the first display device PNL1 (n <m), and the number q of gate lines GLs of the second display device PNL2 is Since the number p of scan lines GLm of the first display device PNL1 is smaller than q <p, if the resolution is the same, the display screen size of the second display device PNL2 is smaller than the display screen size of the first display device PNL1.
    [38] The drive circuit (semiconductor chip) DR is mounted on the side of the part (lower part of FIG. 1) which is not covered by the 2nd board | substrate SUB2m of the 1st board | substrate SUB1m of 1st display apparatus PNL1 in the x direction. This driving circuit DR incorporates a signal line driving circuit and a scanning line driving circuit in one chip. In addition, a frame memory (image memory: GRAM) M having at least a capacity corresponding to the display capacity of the first display device PNL1 is incorporated. Although so-called chip-on-glass (COG) mounting is carried out, this drive circuit DR may be made directly on the 1st board | substrate SUB1m.
    [39] The signal line driver circuit supplies a scan signal (gate signal) to the scan line GLm of the first display device PNL1 and the scan line GLs of the second display device PNL2. That is, this signal line driver circuit has a terminal for supplying a gate signal to both the scanning line GLm of the first display device PNL1 and the scanning line GLs of the second display device PNL2.
    [40] The drive circuit DR includes the first display device PNL1 and the second display device PNL2 based on various timing signals including image data and clock signals input from an external signal source (such as a CPU on the main body) via the flexible printed circuit board FPC2. Has a built-in timing converter for generating timing signals for displaying image data and an image memory M for storing image data. The flexible printed circuit board FPC2 includes electronic components such as resistors and capacitors or a power supply circuit (semiconductor chip) EP.
    [41] The first display device PNL1 and the second display device PNL2 are connected to the flexible printed circuit board FPC1 to supply a scan signal and an image signal (gradation voltage) from the drive circuit DR. In addition, three color filters RGB and a common electrode are formed on the inner surfaces of the second substrates SUB2m and SUB2s of the first display device PNL1 and the second display device PNL2, and a common electrode voltage is applied to the common electrode. The color filter and the common electrode are not shown.
    [42] In the configuration of the embodiment shown in FIG. 1, part of the signal line DLm of the first display device PNL1 is shared with the signal line DLs of the second display device PNL2, and is driven by the driving circuit DR. The first display device PNL1 and the second display device PNL2 are configured to display images either alternatively or simultaneously. When displaying an image only by the 1st display apparatus PNL1, it drives in N line (N is an integer from 1) inversion drive mode (N line AC drive mode). In addition, when the image is displayed by both the first display device PNL1 and the second display device PNL2, the same N-line inversion driving mode is used. On the other hand, when displaying an image only by the 2nd display apparatus PNL2, it displays in frame inversion drive mode (frame alternating current drive mode).
    [43] Fig. 2 is a waveform diagram illustrating a main signal output from the driving circuit in the frame inversion driving mode in the embodiment of the present invention. In Fig. 2, waveform G denotes an output signal to the scan line, waveform D denotes an output signal to the signal line, and waveform CL denotes a line clock signal output. The image display in the first display device PNL1 and the second display device PNL2 is an active element connected to a signal line selected by the line clock signal CL in synchronization with the output signal G to the scanning line (described as a thin film transistor, such as a thin film transistor). The output signal D (gradation voltage) of the display data is supplied to the signal line of the pixel having. This output signal D is applied to each pixel at a pixel clock (not shown) to perform image display.
    [44] When image display is performed only by the second display device PNL2, as shown in Fig. 2, in this frame inversion driving mode, the image 1 frame stored in the frame memory M incorporated in the drive circuit DR is connected to the signal line of the second display device PNL2. Display period in second display device PNL2, which is a period corresponding to the number DLs, (in the figure, denoted by sub side) and display in first display device PNL1, which is a period corresponding to the number of signal lines DLm of first display device PNL1. The inversion is made in the period (in the drawing, the main side). In the next frame, the polarity of the output signal D of the display data is further inverted at the sub side and the main side. At this time, the output signal D to the signal line DLm of the first display device PNL1 is referred to as a "black" signal.
    [45] With such a configuration, when the image display is performed only with the second display device PNL2, the frame inversion driving mode, that is, the frame alternating current driving, becomes independent of the influence of the signal resistance, the wiring resistance, the pixel capacitance, and the like. Electric power is saved and power consumption can be suppressed.
    [46] In addition, the first display device PNL1 and the second display device PNL2 are devices such as a bent mobile phone or a mobile terminal that can be bent mechanically at at least one location and are bound to bend locations. The embodiment in which the display arrangement PNL2 is mounted can be considered. In this case, it is arrange | positioned in the location where only the 2nd display arrangement PNL2 is visible in a standby state, and also the 1st display apparatus PNL1 is also visible at the time of a talk time or an email operation. When the device is bent, the second display device PNL2 is driven in the frame inversion mode, and when the device is opened to bring the first display device PNL1 into the visible state, the first display device PNL1 is driven in the line inversion mode. You can think of it.
    [47] Fig. 3 is a waveform diagram illustrating a main signal output from the driving circuit in the N line inversion driving mode in the embodiment of the present invention. Reference numerals of the waveforms in FIG. 3 are the same as in FIG. 2. In FIG. 3, when image display is performed only by the first display device PNL1 or when image display is simultaneously performed by the first display device PNL1 and the second display device PNL2, the polarity is maintained for every N lines on the sub side and the main side. The display is reversed. N is one or more and the number of signal lines DLs of the second display device PNL2 is preferably smaller than one line to several lines.
    [48] By setting this driving mode, the signal lines common to the second display device PNL2 on the screen of the first display device PNL1 and other signal lines are generated due to the influence of the wiring resistance and pixel capacitance of the second display device PNL2. Vertical smear can be suppressed and high quality image display can be achieved.
    [49] The command signal for selectively displaying an image on the first display device PNL1 and the second display device PNL2 described above detects the opening and closing of the screen unit, for example, when the present invention is applied to a screen folding mobile phone having two screens. A display mode selection signal for displaying only the second display device while the screen portion is folded, and displaying different images simultaneously on the first display device and the second display device with the screen portion open. It can be configured to generate a signal. At this time, even if the display data displayed on the first display device PNL1 and the second display device PNL2 is divided into regions of the frame memory in correspondence with the first display device PNL1 and the second display device PNL2, the second display device PNL2 A memory for storing display data to be displayed on may be provided separately from the frame memory.
    [50] 4 is a block diagram illustrating an exemplary configuration of a control device in the image display device according to the present invention. Reference code CTL is a display control device, which incorporates a display mode control circuit DMC, and displays various signals such as display data from a central processing unit (CPU) constituting a system of an applied device, and various timing signals including a reference clock. The CS is input to control the display of the image display device. Reference numeral M denotes a graphics memory (GRAM: frame memory) and stores display data from the central processing unit (CPU). The reference code TG generates various timings required for display on the first display device and the second display device based on a reference clock input from a central processing unit (CPU), etc. on the basis of the reference frequency signal generated by the originating circuit OSC. The timing generator circuit, LVG, is a voltage generator circuit for driving liquid crystal, GDR is a scan line driver circuit, and DDR is a signal line driver circuit. Reference numeral G denotes a scan line driving voltage output, and reference numeral D denotes a signal line driving voltage output, and corresponds to a waveform indicated by the same reference numerals in FIGS. 2 and 3.
    [51] The display mode selection signal MCS supplies a command signal for driving the second display device in the frame inversion mode described in FIG. 2 to the display mode control circuit DMC in the form of folding the screen portion. In addition, when the image is displayed only on the first display device or simultaneously on the first display device and the second display device with the screen portion open, the line inversion mode is selected. In the case where an image is displayed only on the first display device with the screen portion open, it can be realized by supplying a "black" signal to the second display device or by separately installing a switch to stop the display of the second display device. have. The display mode selection signal MCS may be inputted to the central processing unit (CPU) to provide the display mode selection signal to the display control device CTL as part of various signals CS.
    [52] The display mode control circuit DMC receives the display mode selection signal MCS to set the read address of the graphics memory M, and outputs display data for each display mode to the signal line driver circuit DDR. On the other hand, the display mode control circuit DMC generates a timing signal in the frame inversion mode or the line inversion mode in the timing generation circuit TG in accordance with the selected display mode, so that the voltage in the display mode corresponding to the scan line driver circuit GDR and the voltage generation circuit LVG is reduced. Feed the level. The signal line driver circuit DDR supplies the display voltage required in the signal line based on the display data from the graphics memory GRAM and the voltage level from the voltage generation circuit LVG. Further, the scan line driver circuit GDR supplies the scan voltage necessary for the scan line based on the timing signal from the timing generator circuit TG and the voltage level from the voltage generator circuit LVG.
    [53] As described above, according to the present embodiment, the configuration can be simplified by using one signal line driver circuit for driving each of the first and second display devices, and the display mode of the second display device composed of fewer signal lines can be obtained. The low power consumption is realized by setting the frame inversion driving mode.
    [54] 5 is a plan view schematically illustrating a configuration of another embodiment of the image display device according to the present invention. The same reference numerals as in FIG. 1 correspond to the same functional parts. In the image display device described in FIG. 1, the scan line driver circuit GDR is embedded in the same semiconductor chip as the signal line driver circuit DDR. However, in the present embodiment, the first display device PNL1 includes the scan line driver circuit GDR as an independent semiconductor chip. The substrate SUB1m was mounted in parallel with the signal line driver circuit DDR. The scanning line from the scanning line driver circuit GDR is disposed along one side in the y direction of the first substrate SUB1m of the first display device PNL1, and the first display of the second display device PNL2 is disposed in the second display device PNL2 via the flexible printed circuit board FPC1. It is arrange | positioned along one side of the y direction of the board | substrate SUB1s. Since other configurations and operations are the same as in the above embodiment, repeated descriptions are omitted.
    [55] Also in this embodiment, the configuration can be simplified by using one signal line driver circuit for driving each of the first and second display devices, and the display mode of the second display device composed of fewer signal lines can be frame inverted and driven. By using the mode, low power consumption is realized.
    [56] 6 is a plan view schematically illustrating a configuration of another embodiment of the image display device according to the present invention. The same reference numerals as in FIG. 1 correspond to the same functional parts. In this embodiment, the scan line driver circuit GDR in FIG. 5 is mounted on one side in the y direction of the first substrate SUB1m constituting the first display device PNL1. The scanning line from the scanning line driver circuit GDR is disposed along one side in the y direction of the first substrate SUB1m of the first display device PNL1, and the first display of the second display device PNL2 is disposed in the second display device PNL2 via the flexible printed circuit board FPC1. It is arrange | positioned along one side of the y direction of the board | substrate SUB1s. Since other configurations and operations are the same as in the above embodiment, repeated descriptions are omitted.
    [57] Also in this embodiment, the configuration can be simplified by using one signal line driver circuit for driving each of the first and second display devices, and the display mode of the second display device composed of fewer signal lines can be frame inverted and driven. By using the mode, low power consumption is realized.
    [58] 7 is a plan view schematically illustrating a configuration of another embodiment of the image display device according to the present invention. The same reference numerals as in FIG. 1 correspond to the same functional parts. In this embodiment, the scan line driver circuit GDR is divided into two parts, the first scan line driver circuit GDR1 and the second scan line driver circuit GDR2, and mounted on two opposite sides in the y direction of the first substrate SUB1m constituting the first display device PNL1. It was. For the first display device PNL1, the scan line from the first scan line driver circuit GDR1 is disposed along one side of the first direction SUB1m in the y direction of the first display device PNL1, and the scan line from the second scan line driver circuit GDR2. Is disposed along one side of the other side in the y direction of the first substrate SUB1m of the first display device PNL1. Scan lines in the first display device PNL1 are alternately formed in the display area.
    [59] The scanning line to the second display device PNL2 is disposed along one side of the first direction SUB1s of the second display device PNL2 via the flexible printed circuit board FPC1 from the first scanning line drive circuit GDR1. Since other configurations and operations are the same as in the above embodiment, repeated descriptions are omitted.
    [60] According to the present embodiment, the configuration can be simplified by using one signal line driver circuit for driving each of the first and second display devices, and the display mode of the second display device composed of fewer signal lines is frame inverted drive. By using the mode, low power consumption is realized, and the display area of the first display device PNL1 can be arranged in the center of the first substrate SUB1m, so that the application device can be easily mounted in the center of the display unit.
    [61] 8 is an exploded perspective view illustrating a configuration example of a liquid crystal display module using the liquid crystal display device according to the present invention. The liquid crystal display device used for this liquid crystal display module corresponds to what was demonstrated in FIG. In Fig. 8, a main display area ARm composed of a plurality of pixels having a thin film transistor connected to the intersection of the scan line and the signal line is formed on the first substrate SUB1m of the first display device PNL1, and the scan line driver circuit GDR and the signal line driver circuit are formed. DDR is installed. The color filter CF and the common electrode (not shown) are formed on the main surface (inner surface) of the second substrate SUB2m of the first display device PNL1. The liquid crystal layer is sealed between the first substrate SUB1m and the second substrate SUB1s. Moreover, the optical compensation sheet OPS which consists of a 1st polarizing plate POL1, a diffusion sheet, and a prism sheet is provided in the back surface of 1st board | substrate SUB1m. Moreover, the polarizing plate POL2 is provided also in the upper surface of 2nd board | substrate SUB2m.
    [62] The scanning line driver circuit GDR and the signal line driver circuit DDR are mounted around the first substrate SUBm1, one end of the flexible printed circuit board FPC2 is connected to the mounting side of the signal line driver circuit DDR, and the other terminal TM is not shown. (Such as a central computing device). On the back of the optical compensation sheet OPS, an illuminating device (back light) composed of a light source such as a light emitting diode LEDA and a light guide plate CLB is disposed. These components are integrated in the lower case CAS and the upper case SHC to form a liquid crystal display module.
    [63] On the other hand, on one side of the first display device PNL1, the second display device PNL2 is connected to the flexible printed circuit board FPC1. The structure of the second display device PNL2 is also similar to that of the main panel PNL1, and sub-display areas ARs formed of a plurality of pixels having thin film transistors are formed at the intersections of the scan lines and the signal lines. The second display device PNL2 does not have to be a full color display like the first display device, and it is also possible to have a monochrome display. The scanning line and the signal line are configured as described in the above embodiment. The liquid crystal display module configured as described above is used as a display means of a cellular phone or a portable information terminal, but any so-called electronic device having two screen displays can be applied.
    [64] FIG. 9 is a plan view for explaining the appearance of a configuration example of a liquid crystal display module using the liquid crystal display device according to the present invention, and shows a state in which the developed view described in FIG. 8 is assembled. The first display device PNL1 is formed of the first substrate SUB1m and the second substrate SUB2m, and the scanning line driver circuit GDR and the signal line driver circuit DDR, each of which is a semiconductor chip, are mounted around the main display area ARm. Electronic components such as HA resistors and capacitors and power supply circuit chips may be mounted on the flexible printed circuit board FPC2.
    [65] The second display device PNL2 is connected to the first display device PNL1 with the flexible printed circuit board FPC1 as described in the above embodiment. The second display device PNL2 can be used, for example, for use in simple data display such as a standby display, a clock display, or an e-mail reception display in a mobile phone having the first display device PNL1 as the main display screen. Do. In the above-described embodiment, the signal lines of the second display device having a small number of signal lines are extended to one side of the area where the first display device is joined, but the present invention is not limited thereto. It is also possible to extend the signal line in the area to the second display device. It is also possible to form a first display device and a second display device on the same substrate to form an image display device of two screen displays. In this case, the flexible printed circuit board which connects the two display devices in each said embodiment becomes unnecessary.
    [66] In the above embodiment, the liquid crystal display device is taken as an example, but the present invention is not limited thereto, and the organic EL display device which displays an image by the pixel selection method similar to the liquid crystal display device, and other active matrix display devices are similarly applied. Applicable
    [67] As described above, according to the present invention, in an image display apparatus for driving two display apparatuses having different number of signal lines by a common driving circuit, the two display apparatuses may be selected alternatively or simultaneously to display an image. Since the vertical smear generated in the display device with more signal lines when suppressed is suppressed, high quality image display can be provided, and an image display device can be provided that realizes lower power consumption.
    权利要求:
    Claims (14)
    [1" claim-type="Currently amended] A plurality of first scan lines and a plurality of first signal lines are arranged in a matrix on the substrate,
    A first display device having a plurality of first pixels having a first switching element connected to an intersection of the first scan line and the first signal line;
    A plurality of second scan lines and a plurality of second signal lines are arranged in a matrix on the substrate,
    A second display device having a plurality of second pixels having a second switching element connected to an intersection of the second scan line and the second signal line;
    A display control device for controlling display operations of the first display device and the second display device;
    The number of the second signal lines of the second display device is less than the number of the first signal lines of the first display device,
    The second signal line of the second display device is connected to the first signal line of the first display device,
    The display control device displays an image by driving the first display device in a first display mode, and displays the image by driving either the first display mode or a drive in a second display mode. Image display device for displaying.
    [2" claim-type="Currently amended] The method of claim 1,
    The first display mode is a line inversion mode,
    And the second display mode is a frame inversion mode.
    [3" claim-type="Currently amended] The method of claim 2,
    The display control device drives the first display device in a line inversion mode when displaying an image on the first display device, and sets the second display device in a frame inversion mode when displaying an image only on the second display device. An image display device driven by.
    [4" claim-type="Currently amended] The method of claim 3,
    And the display control device drives the first and second display devices together in a line inversion mode when displaying an image on both the first display device and the second display device.
    [5" claim-type="Currently amended] The method of claim 1,
    The display control device has a display mode control circuit,
    An image display apparatus which controls a display mode by said display mode control circuit.
    [6" claim-type="Currently amended] The method according to any one of claims 1 to 5,
    And the display control device has an image memory having a display data capacity displayed at least on the first display device.
    [7" claim-type="Currently amended] The method of claim 1,
    The first panel and the second panel are mounted in a device that can bend mechanically at at least one place,
    The said 1st panel and the said 2nd panel are arrange | positioned at the said bending point boundary,
    In the state where the device is bent, the first panel is disposed on an invisible portion,
    The image display apparatus which arrange | positioned the said 2nd panel in the visible part in the state which the said apparatus was bent.
    [8" claim-type="Currently amended] The method of claim 7, wherein
    And the second panel is driven in a frame inversion mode while the device is bent.
    [9" claim-type="Currently amended] The method of claim 7, wherein
    And the first panel is driven in a line inversion mode when the device is opened and the first panel is in a visible state.
    [10" claim-type="Currently amended] A substrate having a plurality of first scanning lines extending in a first direction and arranged in a second direction crossing the first direction and a plurality of first signal lines extending in the second direction and arranged in the first direction; A first display panel having:
    A plurality of second scanning lines extending in the first direction and less than the first scanning lines arranged in the second direction, and connected with the first signal lines extending in the second direction and arranged in the first direction A second display panel having a substrate on which a plurality of second signal lines are formed, the second signal line being smaller than the first signal line;
    A scan line driver circuit for supplying a scan signal to the first scan line and the second scan line, a signal line driver circuit for supplying a signal to the first signal line and the second signal line;
    An image memory having a display data capacity displayed on at least the first display panel;
    A display control device configured to control a display operation of the first display panel and the second display panel;
    The display control device,
    When the image is displayed only on the first display panel, the first display panel is driven in the first mode. When the image is displayed only on the second display panel, the second display panel is driven in the second mode.
    And displaying each of the first and second display panels together in a first mode when displaying an image on both the first display panel and the second display panel.
    [11" claim-type="Currently amended] The method of claim 10,
    The first mode is a line inversion mode,
    And the second mode is a frame inversion mode.
    [12" claim-type="Currently amended] The method according to claim 10 or 11, wherein
    The display control device has a display mode control circuit,
    An image display device which controls a display mode by the display mode control circuit.
    [13" claim-type="Currently amended] An image display device having a first panel and a second panel,
    The first panel has a plurality of signal lines and a plurality of scanning lines arranged to intersect the plurality of signal lines,
    The second panel has a plurality of signal lines and a plurality of scanning lines arranged to intersect the plurality of signal lines,
    At least two signal lines of the plurality of signal lines of the first panel and the second panel are electrically extended and disposed on each panel,
    The number of signal lines of the second panel is less than the number of first signal lines,
    The first panel is driven in one mode,
    And the second panel can be driven in another mode besides the mode of the first panel.
    [14" claim-type="Currently amended] The method of claim 11,
    The one mode is a line inversion mode,
    And the other mode is a frame inversion mode.
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    同族专利:
    公开号 | 公开日
    TWI254901B|2006-05-11|
    CN1501345A|2004-06-02|
    US7336252B2|2008-02-26|
    JP2004163790A|2004-06-10|
    US20080150870A1|2008-06-26|
    US7956835B2|2011-06-07|
    US20040140947A1|2004-07-22|
    TW200419518A|2004-10-01|
    JP4256665B2|2009-04-22|
    KR100601240B1|2006-07-19|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2002-11-15|Priority to JP2002331668A
    2002-11-15|Priority to JPJP-P-2002-00331668
    2003-11-14|Application filed by 가부시키가이샤 히타치 디스프레이즈
    2004-05-20|Publication of KR20040042901A
    2006-07-19|Application granted
    2006-07-19|Publication of KR100601240B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP2002331668A|JP4256665B2|2002-11-15|2002-11-15|Image display device|
    JPJP-P-2002-00331668|2002-11-15|
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