KR20090058888A

KR20090058888A - Liquid crystal display device for image scanner

Info

Publication number: KR20090058888A
Application number: KR1020070125685A
Authority: KR
Inventors: 백흠일
Original assignee: 엘지디스플레이 주식회사
Priority date: 2007-12-05
Filing date: 2007-12-05
Publication date: 2009-06-10

Abstract

The present invention relates to a liquid crystal display device having a scanner function. In the liquid crystal display according to the present invention, a plurality of pixels consisting of red, green, and blue sub-pixels are arranged in a matrix form, and the first pixel (m, n ), Adjacent pixels based on the first pixel (m, n) are respectively a second pixel (m, n + 1), a third pixel (m + 1, n), and a fourth pixel (m + 1, n +). After defining one unit block divided by 1), at least one photo sensor is arranged in each of the four pixels included in each unit block, where m and n are each positive integers.

The photosensor is characterized by consisting of a capacitor for accumulating the optical voltage in proportion to the amount of light, a switching element for outputting the optical voltage stored in the capacitor and a switching element for controlling the output of the optical voltage to the external circuit.

Description

Liquid crystal display with scanner function {LIQUID CRYSTAL DISPLAY DEVICE FOR IMAGE SCANNER}

The present invention relates to a liquid crystal display device having a scanner function.

A typical liquid crystal display device (LCD) displays an image corresponding to the video data by adjusting the light transmittance of the liquid crystal according to the video data. Such a liquid crystal display device can increase the size of the screen beyond the limit while reducing the thickness. In addition, the liquid crystal display device can be made slimmer and lighter. In this respect, the liquid crystal display device is used as a display device of a computer or a display device of a television receiver in place of a cathode ray tube display device.

In the liquid crystal display, a pixel driving signal (or voltage) according to a gray scale value is applied to each of the liquid crystal cells arranged in a matrix form. The liquid crystal molecules included in the liquid crystal cell are aligned in a direction corresponding to a potential difference between the pixel driving signal and the reference voltage (or common voltage). The amount of light passing through the liquid crystal cell is adjusted according to the alignment direction of the liquid crystal molecules, so that an image is displayed.

Recently, the liquid crystal display device for displaying an image has been developed into a multifunctional device. In particular, a liquid crystal display device having a function of a scanner is added by adding an array for light sensing to an array for display. It is proposed.

When the scanner-integrated liquid crystal display is driven in a scanner mode, the scanner generates an optical voltage according to the received light amount and stores the optical voltage in an optical voltage storage capacitor, and outputs the stored optical voltage to an external circuit according to a scan signal to scan in the external circuit. The external circuit is normally driven in order of reading the image scan result by comparing with the reference voltage for reading, wherein the external circuit unit resets the reset voltage at the same level as the reference voltage together with the input of the optical voltage while the scan signal is applied. Outputting the photovoltage storage capacitor charges the photovoltage storage capacitor to an arbitrary voltage level.

However, the conventional scanner-integrated liquid crystal display device has a photo sensor formed in each of the red, green, and blue subpixels of the liquid crystal display panel, thereby reducing the area of the subpixels displaying an image.

Since the photo sensors for the scanner function occupy 40% or more of the aperture ratio of each sub-pixel, the image quality of the liquid crystal display is degraded, and power consumption is large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device having a scanner function that can be implemented as a multi-function display device so that the liquid crystal display device can maximize the area displayed while serving as a scanner.

In the liquid crystal display device having a scanner function according to the present invention for achieving the above object, a plurality of pixels consisting of red, green and blue sub-pixels are arranged in a matrix form, m-th row and n-th column of the pixels The pixels that intersect the first pixel (m, n), and adjacent pixels based on the first pixel (m, n) are respectively the second pixel (m, n + 1) and the third pixel (m + 1, n). After defining one unit block by dividing into fourth pixels m + 1 and n + 1, at least one photo sensor is disposed in each of the four pixels included in each unit block, where m, n is each a positive integer)

In addition, in the liquid crystal display device having a scanner function according to the present invention, a plurality of pixels composed of red, green, and blue sub-pixels are arranged in a matrix form, and the pixels in which the m-th row and the n-th column intersect are removed. Adjacent pixels based on one pixel (m, n), the first pixel (m, n) are respectively the second pixel (m, n + 1), the third pixel (m, n + 2), and the fourth pixel ( m, n + 3, fifth pixel (m + 1, n), sixth pixel (m + 1, n + 1), seventh pixel (m + 1, n + 2), eighth pixel (m + 1, n + 3, ninth pixel (m + 2, n), tenth pixel (m + 2, n + 1), eleventh pixel (m + 2, n + 2), twelfth pixel (m + 2, n + 3, thirteenth pixel (m + 3, n), fourteenth pixel (m + 3, n + 1), fifteenth pixel (m + 3, n + 2), sixteenth pixel (m + After defining one unit block by dividing 3, n + 3), at least one photo sensor is disposed in each of 16 pixels included in the unit block (where m and n are each positive integers).

The photosensor may include a capacitor configured to accumulate an optical voltage in proportion to an amount of light, a switching element for outputting an optical voltage stored in the capacitor, and a switching element for controlling output of the optical voltage to an external circuit.

As described in detail above, the present invention has an effect of having a scanner function while securing an opening area by selectively placing a photosensor in a sub pixel area of the liquid crystal display.

In addition, the present invention has the effect that can implement the same color image while using fewer photosensors than conventional.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. First, it should be noted that the same components or parts in the drawings represent the same reference numerals as much as possible. In describing the embodiments, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the gist of the embodiments.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a system block diagram of a liquid crystal display device having a scanner function according to the present invention.

Referring to FIG. 1, a liquid crystal display device having a scanner according to an exemplary embodiment of the present invention may include a gate driver 12 and a data driver 14 electrically connected to a liquid crystal display panel 10; A timing controller 16 for controlling the operation of these drivers 12 and 14; A read circuit unit 17 for reading the optical data signal charged from the photosensor disposed in the sub-pixel area of the liquid crystal display panel 10 and a memory 18 for storing the optical data read from the read circuit unit 17; Equipped.

In the liquid crystal display panel 10, a plurality of sub pixel regions arranged in an active matrix form are distinguished by crossing gate lines GL1 to GLn and data lines DL1 to DLm. Liquid crystal pixels are formed in each of the plurality of pixel regions. In addition, between the gate lines GL1 to GLn, driving voltage lines DRVL1 to DRVLn and bias lines BL1 to BLm are respectively used to drive the photosensors disposed in the sub-pixel region. And a readout line for reading optical data stored in the photosensor disposed in the sub-pixel area while being parallel to the data lines DL1 to DLm, and arranged to cross each of the data lines DL1 to DLm. ROL1 to ROLm are arranged.

The gate driver 12 sequentially enables a plurality of gate lines GL1 to GLn for one frame (period of one vertical synchronizing signal) sequentially by a predetermined period (for example, one horizontal synchronizing signal). . To this end, the gate driver 12 generates a plurality of gate signals having exclusively enable pulses which are sequentially shifted for each period of the horizontal synchronization signal. The gate enable pulse included in each of the plurality of gate signals has the same width as the period of the horizontal synchronization signal. The enable pulse included in each of the plurality of gate signals is generated once every frame period. To generate these multiple gate signals, the gate driver 12 responds to gate control signals GCS from the timing controller 16. The gate control signals GCS include a gate start pulse GSP and at least one gate clock GSC. The gate start pulse GSP maintains a specific logic (for example, high logic) corresponding to a period of one horizontal sync signal from a start point of a frame period.

Whenever one of the plurality of gate lines GL1 to GLn is enabled, the data driver 14 corresponds to the number of data lines DL1 to DLm (that is, the number of liquid crystal pixels arranged in one gate line). Generate pixel driving signals corresponding to the number). Each of these one-line pixel data signals is supplied to corresponding liquid crystal pixels on the liquid crystal display panel 10 via corresponding data lines DL. Each of the liquid crystal pixels arranged on the gate line GL passes an amount of light corresponding to a voltage level of a corresponding pixel driving signal. In order to generate the pixel drive signal for one line, the data driver 14 generates one line of pixel data VDd for each period of the enable pulse included in the gate signal in response to the data control signal DCS. Enter sequentially. The data driver 14 simultaneously converts the pixel data VDd for one line input sequentially into an analog pixel drive signal.

The timing controller 16 inputs the synchronization signals SYNC from an external video source (for example, an image demodulation module included in a television receiver or a graphics module included in a computer system) not shown. The sync signals SYNC include a data clock Dclk, a data enable signal DE, a horizontal sync signal Hsync, a vertical sync signal Vsync, and the like. The timing controller 16 uses the synchronization signals SYNC to allow the gate driver 12 to sequentially scan the gate lines GL1 to GLn on the liquid crystal display panel 10 every frame. Generate gate control signals GCS necessary to generate the gate signal. In addition, the timing controller 16 sequentially inputs one line of pixel data VDd for each period in which the data driver 12 enables the gate line GL, and sequentially inputs the pixel data of one line. Generates data control signals DCS necessary for converting (VDd) into an analog form pixel data signal. Further, the timing controller 16 inputs a pixel data stream VDi divided in units of frames (one image unit) from a video source. The timing controller 16 divides the pixel data stream VDi for each frame into the pixel data stream VDd for each line, and divides the pixel data stream VDd for the divided line to the data driver 14. Supply.

In addition, in the photosensors disposed on the liquid crystal display panel 10, an optical data signal (photovoltage signal) stored in each sub-pixel unit in which the photosensors are arranged may be output as the readout lines ROL1 and ..ROLm. Read by the read circuit unit 17. Then, it stores in the memory 18. The optical data values stored in the memory 18 are treated as separate data signals for use in the liquid crystal display panel 10 by the timing controller 16 and displayed on the liquid crystal display panel 10. This is used when the liquid crystal display operates in the scan mode and displays on the liquid crystal display panel 10 the optical voltage (data signal) obtained by the scan driving in the sub-pixel in which the photo sensor is arranged.

2 is a circuit diagram of a sub pixel of a liquid crystal display device having a scanner function according to the present invention.

As shown in FIG. 2, in the liquid crystal display having the scanner function provided by the present invention, switching to the display mode and the scanner mode is performed in a circuit to perform separate and distinct operations. The display unit 20 for displaying an image in a region partitioned by the data line DLm and the gate lines GLn and GLn + 1, and performs a light sensing according to the driving of the scanner and generates a voltage generated by the light sensing result. And a photo-sensing unit 22 for storing the voltage, and a switching unit 23 for controlling the output of the voltage generated and stored by the photo-sensing unit 22 to the external readout circuit unit 17. do. The photo sensing unit 22 and the switching unit 23 form one photo sensor unit 25.

The display unit 20 has a sub pixel structure for liquid crystal display for displaying an image using liquid crystal LC, and the sub pixel may be any one of red, green, and blue sub pixels. Referring to the specific operation of the sub-pixel having the photo-sensing unit 22 shown in the drawing, the data is switched and controlled by the scan signal Vg (n + 1) applied from the n + 1th gate line GLn + 1. A first switching device T1 outputting the data Vd (m) received from the line DLm, and a first switching device connected to the first switching device T1 to store the data Vd (m). A capacitor Cst1 and a liquid crystal capacitor Clc connected to the first switching element T1 and performing image display corresponding to the input data using the liquid crystal LC are included.

The photo-sensing unit 22 stores a second switching device T2 that outputs a voltage in proportion to the amount of received light, and a voltage (hereinafter, referred to as an “optical voltage”) output from the second switching device T2. It is comprised including two capacitors Cst2. In this case, since the second switching element T2 is a sensing thin film transistor that outputs an optical voltage proportional to the amount of light received, the gate terminal is connected to the bias line BLn to drive the bias voltage Vbias of the DC level. This is applied and the source terminal is connected to the driving voltage line DRVLn so that the driving voltage Vdrv of the DC level is continuously applied. The biasing voltage Vbias is a sensing operation while the photosensitive sensor maintains a normal off state, so 0 V or negative voltage when the second switching element T2 is N type or 0 V when P type. Or a positive voltage. In addition, the driving voltage Vdrv continuously supplies a voltage of a predetermined level (usually about 10V) to the second switching device T2 so that the second switching device T2 outputs a voltage proportional to the amount of light received. It serves as a voltage supply source, and may be referred to as a voltage supply source that provides an optical voltage to the second capacitor Cst2.

The switching unit 23 allows the third switching device T3 to output the optical voltage stored in the second capacitor Cst2 of the photo-sensing unit 22 to the readout circuit unit 17 through the readout line ROLn. It is connected to the n-th gate line (GLn) is controlled by the scan signal (Vg (n)) and outputs the optical voltage to the read circuit unit 17. In this case, although not shown, the n-th gate line GLn is a gate line that is shared with the first switching device T1 of the display unit of the n-th pixel of the upper portion.

The read circuit 17 receives the optical voltage stored in the second capacitor Cst2 of the photo-sensing unit 22 provided in each pixel through the readout line ROLn, and the reference voltage Vref for scan reading. The voltage difference is interpreted as a scan result of the pixel, and the voltage difference between the optical voltage and the reference voltage is used as data applied to the display unit 20 and stored in the memory for display.

The optical data stored in the memory is a circuit unit having an algorithm, and may be preferably embedded in a timing controller of the liquid crystal display device. When the difference between the optical voltage and the reference voltage Vref is 0, the readout circuit 17 may interpret the image of the scan object corresponding to the corresponding pixel as black.

As described above, in the pixel structure of the liquid crystal display device having the scanner according to the embodiment of the present invention, all the switching elements are configured as N type thin film transistors, but may be configured as P type thin film transistors according to necessity and application.

3A and 3B are diagrams for describing a scan driving method of a liquid crystal display device having a scanner function according to the present invention.

2 and 3A, the scanner mode driving of the liquid crystal display of the present invention divides the effective time of the scan signal sequentially applied to the respective gate lines GLn and GLn + 1 to store the optical voltage of each pixel. And a second time (1) for outputting the optical voltage stored in the capacitor to the read circuit unit 17 (Fig. 2) and a second time (2) for outputting a reset voltage from the read circuit unit to the optical voltage storage capacitor. . Thereafter, during the third time (③) during which the scan signal is not applied, the scanner operation is performed by configuring the optical voltage to be charged with the optical voltage storage capacitor again.

Referring to FIGS. 2 and 3B, another scanner mode driving of the liquid crystal display of the present invention may be performed in a first time within about one frame driving time (or may be longer than one frame driving time) immediately after switching to the scanner mode. (I) prior to driving to simultaneously apply the first voltage V1 of the same voltage level as the reference voltage Vref of the read circuit section 17 of FIG. 2 to the second capacitor Cst2 of each pixel. After a period of 2 hours (2) passes, a sequential scan signal is applied to each gate line (Gn, Gn + 1) to drive a normal scanner.

In this case, the second time given to the driving timing (2) is a delay time or an integrated circuit which appears according to an operating characteristic of the readout circuit unit 17 (FIG. 2), which is generally manufactured as an integrated circuit chip (IC chip). Depending on the type of chip, the second time ② may not appear. Of course, the driving of simultaneously applying the first voltage V1 of the same voltage level as the reference voltage Vref of the read circuit unit 17 to the second capacitor Cst2 of each pixel includes two or more gate lines. It is also possible to sequentially perform a plurality of groups defined as one group.

Next, driving of the scanner after the first time (1) and the second time (2) will be described. Scan signals Vg (n) and Vg (n + 1) are applied to the respective gate lines GLn and GLn + 1. ) Is sequentially applied, and the third switching element T3 of the switching unit 23 of FIG. 2 is kept on during the scan signal applying time. In this case, a third time of dividing the time for which the scan signal is applied and transmitting the optical voltage stored in the second capacitor Cst2 of the photo sensing unit 22 to the readout circuit unit 17 through the readout line ROL is performed. Time ③ and a fourth time ④ of applying the first voltage V1 from the readout circuit 17 through the readout line RO to reset the second capacitor Cst2 thereafter. Drive by dividing by.

Finally, during the fifth time (5) when the scan signal is not applied, the optical voltage output by the light sensing of the second switching element T2 of the photo sensing unit 22 is stored in the second capacitor Cst2.

4A and 4B are layout views of a photo sensor disposed in a sub pixel area of a liquid crystal display apparatus having a scanner function according to the present invention.

As shown in FIG. 4A, in the present invention, the photosensor is not disposed in each of the subpixels (red, green, and blue subpixels) of the liquid crystal display panel, and the subpixels are disposed according to a predetermined design condition regarding the photosensor arrangement. Optionally place the photosensor.

The red (R), green (G), and blue (B) subpixels are defined as one pixel, and these four pixels are designed such that one photosensor is disposed in an adjacent unit block. As shown in the figure, a pixel corresponding to any m rows and n columns of a plurality of pixels arranged in a matrix form is called a first pixel (m, n) and is horizontally aligned with the first pixel (m, n). An adjacent pixel is referred to as a second pixel (m, n + 1), a pixel adjacent to the first pixel (m, n) in a vertical direction is referred to as a third pixel (m + 1, n), and a third pixel (m) A pixel adjacent to + 1, n in the horizontal direction and adjacent to the second pixel m, n + 1 in the vertical direction is defined as a fourth pixel m + 1, n + 1. , n is each a positive integer)

As described above, four pixels are defined as one block, and then a first photosensor Pr (m, n) is disposed on the red (R) subpixel of the first pixel (m, n), and the second pixel is disposed. The second photosensor Pg (m, n + 1) is disposed in the green subpixel of (m, n + 1), and the third photosensor Pg (m + 1, n) is disposed, and the fourth photosensor Pb (m + 1, n + 1) is disposed in the blue subpixel of the fourth pixel m + 1, n + 1. However, the photosensors may be disposed in two or sub-pixels corresponding to each pixel area.

By arranging the photosensors according to the above rules, an arrangement structure of the photosensors as shown in FIG. 4B can be obtained. Each of Pr, Pg, and Pb represents a photosensor disposed in red, green, and blue subpixels, Pr represents a photosensor in a red subpixel of each subpixel, Pg represents a green subpixel, and Pb represents a Photosensors are disposed on the blue sub-pixels.

Although the blue pixel data is received in the region Pb22 corresponding to the blue sub-pixel in FIG. 4B, the green pixel data in the (2, 2) -th pixel region is determined by Pg22 = (Pg12 + Pg21 + Pg23 + Pg32) / 4. You can get the value. In addition, the red pixel data value in the (2, 2) -th pixel region can be inferred with Pr22 = (Pr11 + Pr13 + Pr31 + Pr33) / 4. Such a method is obtained by a de mosaic method applied in the field of a known CCD or CMOS imaging device.

In the present invention, as shown in the figure, the photo sensor is disposed only in some sub pixel areas of the sub pixels of the pixel area, and the pixel data value of the sub pixel area in which the photosensor is not arranged using the pixel data obtained by the scanner operation. Can be obtained.

5A and 5B are layout views of a photo sensor disposed in a sub pixel area of a liquid crystal display having a scanner function according to another exemplary embodiment of the present invention.

Referring to FIG. 5A, in another embodiment of the present invention, the red (R), green (G), and blue (B) sub-pixels are defined as one pixel, and these 16 pixels are each one in an adjacent unit block. The photosensor is designed to be arranged. As shown in the figure, one pixel is referred to as a first pixel (m, n), and a pixel adjacent in the horizontal direction to the first pixel (m, n) is referred to as a second pixel (m, n + 1). And a third pixel (m, n + 2) horizontally adjacent to the second pixel (m, n + 1) and a fourth pixel (m) adjacent to the third pixel (m, n + 2). , n + 3).

In the same manner as described above, the fifth pixel (m + 1, n), the sixth pixel (m + 1, n + 1), the seventh pixel (m + 1, n + 2), and the eighth pixel (m + 1, n + 3, a ninth pixel (m + 2, n), a tenth pixel (m + 2, n + 1), an eleventh pixel (m + 2, n + 2), a twelfth pixel (m + 2, n + 3, thirteenth pixel (m + 3, n), fourteenth pixel (m + 3, n + 1), fifteenth pixel (m + 3, n + 2), and sixteenth pixel (m + 3, n + 3), where m and n are each positive integers.

As such, the first photosensor Pr (m, n) is disposed in the red (R) subpixel of the first pixel m, n for the 16 pixel blocks, and the second pixel m, n + The second photosensor Pg (m, n + 1) is disposed in the green subpixel of 1), and the third photosensor Pb (m, n) is disposed in the blue subpixel of the third pixel m, n + 2. +2)), and the fourth photosensor Pg (m, n + 3) is disposed in the green sub-pixels of the fourth pixel m, n + 3, respectively.

In this manner, the blue sub-pixel of the fifth photosensor Pg (m + 1, n) and the sixth pixel m + 1, n + 1 are connected to the green sub-pixel of the fifth pixel m + 1, n. A sixth photosensor Pb (m + 1, n + 1) on the pixel and a seventh photosensor Pg (m + 1, n + 2 on the green sub-pixel of the seventh pixel m + 1, n + 2. ), The red sub-pixels of the eighth pixel (m + 1, n + 3) and the blue sub-pixels of the eighth photosensor Pr (m + 1, n + 3) and the ninth pixel (m + 2, n). The ninth photosensor Pb (m + 2, n) on the pixel, and the tenth photosensor Pg (m + 2, n + 1) on the green sub-pixel of the tenth pixel m + 2, n + 1. And a green subpixel of the eleventh photo sensor Pr (m + 2, n + 2) and a twelfth pixel (m + 2, n + 3) to a red subpixel of the eleventh pixel (m + 2, n + 2). The twelfth photosensor Pg (m + 2, n + 3), the thirteenth photosensor Pg (m + 3, n), and the thirteenth photosensor Pg (m + 3, n) 15th photo sensor Pr (m + 3, n + 1) to the red subpixel of the pixel m + 3, n + 1 and 15th to the green subpixel of the fifteenth pixel m + 3, n + 2 The sixteenth photosen on the blue sub-pixel of the photosensor Pg (m + 3, n + 2) and the sixteenth pixel (m + 3, n + 3). And placing a (Pb (m + 3, n + 3)). However, it is possible to place a photosensor in two or sub-pixel corresponding to the pixel regions in each pixel region.

By arranging the photosensors according to the above rules, an arrangement structure of the photosensors as shown in FIG. 5B can be obtained. Each of Pr, Pg, and Pb is a pixel having red, green, and blue subpixels as one unit, and Pr is a photo sensor disposed on a red subpixel, and Pg is a green subpixel and Pb Photosensors are disposed on the blue sub-pixels.

Further, when the photosensors are arranged as described above, only one photosensor is disposed in the vertical pixel direction (m column direction) in the red sub-pixel and the blue sub-pixel around the 16 pixels. Accordingly, the photosensors are arranged in units of four color-sensitive red subpixels and blue subpixels to improve image quality in the display mode.

5b is different from the arrangement of the photosensor 4b.

By using the photosensor disposed in the green sub-pixel area, the green pixel data value in the (2, 2) -th pixel area may be obtained. The green pixel data values are obtained for all the pixels in which the photosensors are arranged in the green subpixels according to the formula Pg22 = (Pg12 + Pg21 + Pg23 + Pg32) / 4.

Using the green pixel data obtained as described above, red and blue pixel data values in the remaining pixel areas are obtained.

The principle to find is as follows.

Pr22 = Pg22 * {(Pr11 / Pg11) + (Pr33 / Pg33)} / 2

Pr23 = Pg23 * {(Pr24 / Pg24) + (Pr33 / Pg33)} / 2

Pb21 = Pg21 * {(Pb31 / Pg31) + (Pb22 / Pg22)} / 2

Pb33 = Pg33 * {(Pb44 / Pg44) + (Pb22 / Pg22)} / 2

In the present invention, as shown in the figure, the photo sensor is disposed only in some sub pixel areas of the sub pixels of the pixel area, and the pixel data of the sub pixel area where the photosensor is not arranged is obtained using the pixel data obtained by the scanner operation. Can be.

Therefore, there is an advantage that the scanner function can be completely performed while ensuring the display area of the liquid crystal display device as much as possible.

* Description of the symbols for the main parts of the drawings *

10 liquid crystal display panel 12 gate driver

14: Data Driver 16: Timing Controller

17: read circuit 18: memory

Claims

A plurality of pixels consisting of red, green and blue sub pixels are arranged in a matrix form,

The first pixel (m, n) and the pixels adjacent to each other based on the first pixel (m, n) of the pixel where the m-th row and the n-th column of the pixels intersect, respectively, the second pixel (m, n + 1). After defining one unit block by dividing into a third pixel (m + 1, n) and a fourth pixel (m + 1, n + 1), at least one or more of each of the four pixels included in each unit block Place the photosensor, where m and n are each positive integers

The photosensor has a scanner function comprising a capacitor for accumulating the optical voltage in proportion to the amount of light, a switching element for outputting the optical voltage stored in the capacitor, and a switching element for controlling the output of the optical voltage to an external circuit. LCD display device.

The liquid crystal display of claim 1, wherein the photosensor is disposed only in any one of red, green, and blue sub-pixels of each pixel.

The photo sensor of claim 1, wherein the photosensor is disposed only in the red sub-pixels in the pixel areas of the m-th row and the n-th column, and the photosensor is disposed only in the green sub-pixels in the pixel areas of the m-th row and the n + 1 th column. The photosensor is disposed only in the green subpixels in the pixel areas of the m + 1th row and the nth column, and the photosensors are disposed only in the blue subpixels in the pixels of the m + 1th row and the n + 1th column. Liquid crystal display device having a scanner function.

The first pixel (m, n) and the pixels adjacent to each other based on the first pixel (m, n) are the second pixels (m and n + 1), respectively. , Third pixel (m, n + 2), fourth pixel (m, n + 3), fifth pixel (m + 1, n), sixth pixel (m + 1, n + 1), seventh pixel (m + 1, n + 2), eighth pixel (m + 1, n + 3), ninth pixel (m + 2, n), tenth pixel (m + 2, n + 1), eleventh pixel (m + 2, n + 2), twelfth pixel (m + 2, n + 3), thirteenth pixel (m + 3, n), fourteenth pixel (m + 3, n + 1), fifteenth pixel After defining one unit block by dividing into (m + 3, n + 2) and the sixteenth pixel (m + 3, n + 3), at least one photo sensor is attached to each of the 16 pixels included in the unit block. Where m and n are each positive integers

Wherein the photosensor comprises a capacitor configured to accumulate an optical voltage in proportion to an amount of light, a switching element for outputting an optical voltage stored in the capacitor, and a switching element for controlling output of an optical voltage to an external circuit. Liquid crystal display device having a function.

The liquid crystal display device according to claim 4, wherein the photosensor is disposed only in any one of red, green, and blue sub-pixels of each pixel.

The red (R) subpixel of the first pixel (m, n), the green subpixel of the second pixel (m, n + 1), and the third pixel (m, n + 2). ), A blue sub pixel of the fourth pixel (m, n + 3), a green sub pixel of the fifth pixel (m + 1, n), and a sixth pixel (m + 1, n + 1). ) Blue sub-pixel, the green sub-pixel of the seventh pixel (m + 1, n + 2), the red sub-pixel of the eighth pixel (m + 1, n + 3), and the ninth pixel (m + 2). , blue subpixel of n, green subpixel of tenth pixel m + 2, n + 1, red subpixel of eleventh pixel m + 2, n + 2, and twelfth pixel m. A green sub-pixel of + 2, n + 3, a green sub-pixel of the thirteenth pixel (m + 3, n), a red sub-pixel of the fourteenth pixel (m + 3, n + 1), and the fifteenth pixel and a photosensor is disposed in each of the green subpixels (m + 3, n + 2) and the blue subpixels of the sixteenth pixel (m + 3, n + 3).