KR100995570B1 - Liquid crystal display device and liquid crystal display system - Google Patents

Abstract

A liquid crystal display and a liquid crystal display system including the same for improving the recognition rate of light are disclosed. The light sensing liquid crystal display includes a pixel, a light sensing unit, a liquid crystal, and a color filter. The color filter of the portion of the color filter corresponding to the light sensing unit is opened or thinly formed to minimize the loss of the sensing light supplied from the light pen. have. Therefore, a large amount of sensing light is incident on the light sensing unit, thereby improving the light recognition rate and improving the reliability of the light sensing liquid crystal display system. Since the light pen emitting the sensing light to the liquid crystal display generates the sensing light by using the image light emitted from the light sensing liquid crystal display panel, the number of components of the light pen can be greatly reduced, and the volume and weight of the light pen Can also be reduced.

Photosensitive liquid crystal display panel, color filter, light pen, photosensitive liquid crystal display system

Description

Liquid crystal display and liquid crystal display system including the same {LIQUID CRYSTAL DISPLAY DEVICE AND LIQUID CRYSTAL DISPLAY SYSTEM}

1 is a conceptual diagram illustrating a liquid crystal display according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the liquid crystal display shown in FIG. 1.

3 is an equivalent circuit diagram of the pixel illustrated in FIG. 1.

4 is an equivalent circuit diagram of a pixel including a light sensing unit among the pixels shown in FIG. 1.

5 is a cross-sectional view of a liquid crystal display device according to a second embodiment of the present invention.

6 is a cross-sectional view of a liquid crystal display device according to a third embodiment of the present invention.

7 is a cross-sectional view of the light pen according to the fourth embodiment of the present invention.

8 is a conceptual diagram illustrating a liquid crystal display system according to a fifth embodiment of the present invention.

The present invention relates to a liquid crystal display device and a liquid crystal display system including the same, and more particularly to a liquid crystal display device for improving the optical recognition rate of the light sensing unit by minimizing the loss of light incident on the light sensing unit from the outside, and including the same It relates to a liquid crystal display system.

In general, a display device receives an electrical signal from an information processing device and converts the signal into an image. In other words, the conventional display device and the information processing device were only capable of one-way communication. Therefore, the operator needs a separate data input device, for example, a keyboard, a keypad, a mouse, etc., to input new information into the information processing device.

Some of the recently developed display apparatuses have a function of reconstructing an image by outputting data input by an operator to a screen on which an image is displayed to an information processing apparatus. In other words, this means that the bidirectional communication between the display device and the information processing device is enabled.

The conventional display device further includes a touch screen panel for bidirectional communication between the display device and the information processing device. The touch screen panel recognizes the pressure applied by the operator's hand or touch pen and outputs the position data to the information processing apparatus. The information processing apparatus processes the position data input from the display apparatus to output a new image signal to the display apparatus, and the display apparatus displays the new image corresponding to the image signal.

However, due to the touch panel, the display device has a problem in that thickness and weight are increased. In addition, a display device using a touch panel has a problem that is unsuitable for expressing precise characters or pictures.                         

Recently, a light sensing liquid crystal display device that detects light input by an operator to output a location information signal and communicates bidirectionally with an information processing device has been developed. Such a photosensitive liquid crystal display has a built-in photosensitive sensor that detects light and outputs a signal having position information together with pixels displaying an image.

The light sensor detects the light input by the operator and outputs a signal that can be recognized by the information processing device, and the output signal is transmitted to the information processing device. The information processing apparatus outputs a new image signal to the photosensitive liquid crystal display in response to the signal input from the photosensitive liquid crystal display, and the photosensitive liquid crystal display displays the new image by the image signal.

On the other hand, a light pen is required to apply light to a liquid crystal display having a pixel and a light sensing sensor. The light pen has a light source for generating high brightness light. A red light emitting diode having a high optical recognition rate is used as a light source of the light pen, and the light emitting diode is disposed at one end of the light pen facing the liquid crystal display.

However, in the conventional photosensitive liquid crystal display device, a considerable amount of light emitted from the light pen is lost while passing through the color filter and the organic layer protecting the pixels and the photosensitive sensors, and enter the photosensitive sensor. The amount of light entering is reduced. As a result, there is a problem in that the sensing sensitivity of the photosensitive sensors is lowered and the photosensitive liquid crystal display is malfunctioning.

In addition, since parts such as a light emitting diode and a power supply unit are built in the light pen for applying light to the light sensing unit, the production cost is increased, and the light pen has a weight and a volume. In addition, since the power supply unit for supplying power to the light emitting diode is a consumable part, there is a need to frequently replace the power supply unit.

Accordingly, the present invention has been made in view of such a conventional problem, and a first object of the present invention is to minimize the loss of light applied from the outside by a color filter, an organic film, etc. to improve the optical recognition rate of the photosensitive sensor. To provide.

A second object of the present invention is to provide a light sensing liquid crystal display system having a light pen and a light sensing liquid crystal display panel reflecting a part of the image light emitted from the light sensing liquid crystal display device back into the light sensing liquid crystal display panel.

In order to realize the first object of the present invention, the present invention is arranged in a matrix form on a first substrate for transmitting light, on a first substrate, and connected to a pixel voltage applying device and a pixel voltage applying device for outputting a pixel voltage. Pixels including a pixel electrode to which a pixel voltage is applied, a light sensing unit formed in a predetermined portion of the pixel and outputting a signal having position information in response to light applied from the outside, and overlapping with the first substrate, A second substrate, a first substrate, and a second substrate including a color filter formed at a portion corresponding to the pixels and a light inflow portion formed at a portion corresponding to the light detector of the color filter to prevent loss of light applied to the light detector; A liquid crystal display panel including liquid crystal disposed between substrates is provided.                     

A second object of the present invention includes a first substrate for transmitting light, a pixel voltage applying device arranged in a matrix form on the first substrate and outputting pixel voltage, and a pixel electrode connected to the pixel voltage applying device to receive the pixel voltage. Pixels formed on a predetermined portion of the pixel, a light sensing unit configured to output a signal having position information in response to light applied from the outside, and overlapped with the first substrate, and formed on a portion corresponding to each pixel A color filter and a liquid crystal disposed between the first substrate and the second substrate and a second substrate including a light inlet formed on a portion corresponding to the light sensing unit of the color filter to prevent the loss of light applied to the light sensing unit; The liquid crystal display device generates light by sensing light required for driving the light sensing unit and emits the light to the light sensing liquid crystal display panel. Provided is a light sensing liquid crystal display system including a driving module for changing image arrays to generate image light.

According to the present invention, a pixel voltage applying device is formed by removing the color filter of the portion corresponding to the second TFT or making the thickness of the color filter of the portion corresponding to the second TFT thinner than the color filter of the other portion. The amount of light incident on the second TFT is increased by removing the organic film of the portion of the organic film covering the light sensing unit corresponding to the second TFT.

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

Embodiments of Liquid Crystal Display

Example 1

1 is a conceptual diagram illustrating a liquid crystal display according to a first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the photosensitive liquid crystal display shown in FIG. 1.

1 and 2, the liquid crystal display device 1 may include a first substrate 10, a second substrate 20, a liquid crystal 30, a pixel 100, a common electrode 200, and a light sensing unit ( 300).

The first substrate 10 and the second substrate 20 are transparent glass substrates through which light can be transmitted, and the first substrate 10 and the second substrate 20 are disposed to face each other. The sealing member 40 for disposing the liquid crystal 30 on the edge portion of the first substrate 10 and the second substrate 20 in a state where the first substrate 10 and the second substrate 20 face each other. Is placed.

The liquid crystal 30 is interposed between the first substrate 10 and the second substrate 20. The liquid crystal 30 has both an electrical property whose arrangement is changed by an electric field and an optical characteristic that changes the light transmittance of light passing through the liquid crystal 30 in response to the arrangement.

The pixel 100 and the common electrode 200 are used to change the transmittance of light passing through the liquid crystal 30. The pixel 100 is disposed on the first substrate 10, and the common electrode 200 is second. It is disposed on the substrate 20.

3 is an equivalent circuit diagram of the pixel illustrated in FIG. 1.

2 and 3, a plurality of pixels 100 are disposed in a matrix form on the first substrate 10. For example, 1024 × 768 × 3 pixels 100 are formed on the first substrate 10 of the liquid crystal display device 1 having a resolution of 1024 × 768 and performing full-color display. Each pixel 100 includes a pixel voltage applying device 110 and a pixel electrode 120.

Referring to FIG. 3, the pixel voltage applying device 110 applies a pixel voltage necessary for displaying an image to the pixel electrode 120. The pixel voltage applying device 110 includes a gate line 112, a data line 114, and a first thin film transistor (TFT) 116. The gate lines 112 extend in the first direction on the first substrate 10, and 768 in the second direction are arranged in parallel. The gate line 112 is made of aluminum or an aluminum alloy having excellent electrical characteristics.

The data line 114 is insulated from the gate line 112, extends in the second direction so as to vertically intersect the gate line 112, and 1024 × 3 pieces are arranged in a parallel manner in the first direction. The data line 114 is made of aluminum or an aluminum alloy having excellent electrical characteristics.

One first TFT 116 is formed for each portion where the gate line 112 and the data line 114 intersect. The first TFT 116 is composed of a gate electrode G, a source electrode S, a channel layer C, and a drain electrode D. FIG. The gate electrode G of the first TFT 116 is commonly connected to the gate line 112, and the source electrode S of the first TFT 116 is commonly connected to the data line 114. The drain electrode D of the first TFT 116 is connected to the pixel electrode 120.

2 and 3, the pixel electrode 120 is formed on the surface of the organic layer 130 covering the pixel voltage applying device 110, and the position of the pixel electrode 120 is positioned on the gate line 112 and the data line 114. It is an area surrounded by. The pixel electrode 120 is connected to the drain electrode D of the first TFT 116 through a first contact hole 132 formed in a portion of the organic layer 130 corresponding to the first TFT 116. The pixel electrode 120 is made of indium tin oxide (ITO) or indium zinc oxide (IZO) that is transparent and conductive.

Referring back to FIGS. 1 and 2, the common electrode 200 is formed on a surface of the second substrate 20 facing the pixel electrode 120. The common electrode 200 is formed over the entire surface of the second substrate 20 and a common voltage is applied. The common electrode 200 is made of a thin film of indium oxide or zinc indium oxide which is transparent and conductive.

The color filters 210 are disposed between the common electrode 200 and the second substrate 20 to correspond to the pixels 100. The color filters 210 include a red color filter 212 through which light of a red wavelength passes, a green color filter 214 through which light of a green wavelength passes, and a blue color filter 216 through which light of a blue wavelength passes.

4 is an equivalent circuit diagram of a pixel including a light sensing unit among the pixels shown in FIG. 1.

2 and 4, the light detector 300 includes a first sensor line 310, a second sensor line 320, a second TFT 330, and a third TFT 340.

The first sensor line 310 is formed to be long in the second direction of the first substrate 10 spaced apart from the data line 114 by a predetermined distance. The first sensor line 310 is formed on the same layer as the data line 114 and is electrically insulated from the gate line 112.

The second sensor line 320 is formed to be long in the first direction of the first substrate 10 spaced apart from the gate line 112 by a predetermined distance. The second sensor line 320 is formed on the same layer as the gate line 112 and is electrically insulated from the data line 114 and the first sensor line 310.

The second TFT 330 and the third TFT 340 are disposed for each pixel 100 together with the first TFT 116, or 1024 × 768 × 3 pixels 100 formed on the first substrate 10. Are disposed only on the plurality of selected pixels 100.

2 and 4, the second TFT 330 is formed at the intersection of the data line 114 and the second sensor line 320. The second TFT 330 is composed of a gate electrode G, a source electrode S, a channel layer C, and a drain electrode D. The gate electrode G of the second TFT 330 is commonly connected to the second sensor line 320. The channel layer C of the second TFT 330 is disposed on the top surface of the gate electrode G of the second TFT 330 in an insulated state from the gate electrode G of the second TFT 330. The channel consists of a layer (C) is preferably an amorphous silicon thin film (amorphous silicon film) and an n ⁺ amorphous silicon thin film (n ⁺ amorphous silicon film) disposed on the upper surface of the amorphous silicon thin film of a TFT 2 (330). The n ⁺ amorphous silicon thin film is formed in two parts on the surface of the amorphous silicon thin film. The channel layer C of the second TFT 330 formed as described above generates photovoltaic power that electrically conducts the source electrode S of the second TFT 330 and the drain electrode D of the second TFT in response to light. Generate. The source electrode S of the second TFT 330 is in contact with one of two divided n ⁺ amorphous silicon thin films and is commonly connected to the data line 114. The drain electrode portion D of the second TFT 330 is in contact with the other one of the two divided n ⁺ amorphous silicon thin films and is connected to the third TFT 340. The second TFT 330 is driven in response to light provided from the outside.

The third TFT 340 also includes a gate electrode G, a source electrode S, a channel layer C, and a drain electrode D. The gate electrode G of the third TFT 340 is commonly connected to the gate line 112, and the source electrode S of the third TFT 340 is connected to the drain electrode D of the second TFT 330. Connected. The drain electrode D of the third TFT 340 is commonly connected to the first sensor line 310. The third TFT 340 is driven by the driving of the second TFT 330 to output a predetermined signal having positional information to the first sensor line 310.

A sufficient amount of light must be incident on the second TFT 330 to drive the second TFT 330 to output a predetermined signal having positional information to the first sensor line 310. Referring to FIG. 2, in the present exemplary embodiment, the second contact hole 134 is formed in a portion of the organic layer 130 covering the photosensitive unit 300 together with the pixel voltage applying device 110 to correspond to the second TFT 330. ) Is formed to open the organic layer 130. The second contact hole 134 is formed together when the first contact hole 132 is formed.

When the organic layer 130 of the portion corresponding to the second TFT 330 is opened as in the present embodiment, the light applied from the outside does not pass through the organic layer 130, but directly the channel of the second TFT 330. Flows into layer (C). Therefore, since light applied from the outside is not lost by the organic layer 130, a sufficient amount of light flows into the channel layer C of the second TFT 330 to drive the second TFT 330.                     

Reference numeral 140 in FIG. 2 denotes a light blocking film for preventing light incident from the outside from entering the first and third TFTs 116 and 340 so that the first and third TFTs 116 and 340 react to the light. to be.

Example 2

5 is a cross-sectional view of a photosensitive liquid crystal display panel according to a second embodiment of the present invention. The photosensitive liquid crystal display device according to the present embodiment is the same as the photosensitive liquid crystal display device of Example 1 except for the color filter of the first embodiment. Therefore, the same members are denoted by the same reference numerals as those in the first embodiment, and duplicated descriptions thereof will be omitted.

Referring to FIG. 5, a common electrode and a color filter are disposed on the second substrate.

The common electrode 200 is formed on a surface of the second substrate 20 facing the pixel electrode 120. The common electrode 200 is formed over the entire surface of the second substrate 20 and a common voltage is applied. The common electrode 200 is made of a thin film of indium oxide or zinc indium oxide which is transparent and conductive.

The color filter 210 is disposed between the common electrode 200 and the second substrate 20. The color filter 210 includes a red color filter 212 through which light of a red wavelength passes, a green color filter 214 through which light of a green wavelength passes, and a blue color filter 216 through which light of a blue wavelength passes. Among the red color filter 212, the green color filter 214, and the blue color filter 216, the color filter 210 corresponding to the second TFT 330 of the light sensing unit 300 includes the second TFT 330. A light inlet 220 is formed to minimize the loss of light introduced into the channel layer C. The light inlet 220 is locally formed only at a portion of the color filter 210 that corresponds to the second TFT 330. The light inlet 220 may be formed at a portion corresponding to the second TFT 330 rather than a thickness of the color filter 210 at a portion corresponding to the first TFT 116, the pixel electrode 120, and the third TFT 340. It is formed by controlling the thickness of the color filter 210 thin.

That is, a pigment of a color selected from among red, green and blue pigments, for example, a pigment of red color, is applied to the second substrate 20, and a second photosensitive material is applied onto the applied red pigment. The photosensitive material of the portion corresponding to the TFT 330 is slit-exposed. Then, the red color filters 212 are formed on the second substrate, and the light inlet 220 having a thickness smaller than that of other portions is formed in the portion where the slit exposure is performed among the red color filters 212.

As such, when the thickness of the red color filter 212 in the portion corresponding to the second TFT 330 is formed to be thinner than the thickness of the color filter 210 in the other portion, it has green and blue wavelengths among the light input from the outside. A portion of the light that has not passed through the red color filter 212 having a general thickness may pass through the light inlet 220. The light passing through the light inlet 220 is directly incident on the channel layer C of the second TFT 330 through the second contact hole 134 formed in the organic layer 130. Therefore, when the light inlet 220 is formed, a larger amount of light is incident on the second TFT 330 than in the first embodiment, so that the optical recognition rate of the second TFT 330 is higher than in the first embodiment.

Example 3

6 is a cross-sectional view of a photosensitive liquid crystal display panel according to a third embodiment of the present invention. The photosensitive liquid crystal display device according to the present embodiment is the same as the photosensitive liquid crystal display device of Embodiment 2 except for the light inflow portion in Embodiment 2. Therefore, the same members are denoted by the same reference numerals as those in the second embodiment, and duplicated descriptions thereof will be omitted.

Referring to FIG. 6, a common electrode and a color filter are disposed on the second substrate.

The color filter 210 is formed with a light inlet 220 to minimize the loss of light flowing into the channel layer C of the second TFT 330. The light inlet 220 is formed at a portion of the color filter 210 that corresponds to the second TFT 330. The light inlet 220 is formed by locally removing the color filter 210 such that a portion corresponding to the second TFT 330 of the color filter is opened. When the light inlet 220 is formed by removing the color filter 210 as described above, light having a specific wavelength among light introduced from the outside may also be introduced into the second TFT 330. Therefore, the light incident to the inside of the second substrate 20 is not lost by the color filter 210 and the organic layer 130 and flows directly into the channel layer C of the second TFT 330. Therefore, since a larger amount of light is incident on the second TFT 330 than in the second embodiment, the optical recognition rate of the second TFT 330 is also higher than in the second embodiment.

Example of a light pen

Example 4

7 is a cross-sectional view of the light pen according to the fourth embodiment of the present invention.

The light pen 400 is a device for applying light required for driving the second TFT 330 into the photosensitive liquid crystal display panel 1 described in the first to third embodiments. Referring to FIG. 7, the light pen 400 includes a body 410 and a light converter 420.

The light conversion unit 420 has a disc shape and is disposed on the body 410. In the present embodiment, the light conversion unit 420 is disposed at the end of the body 410 having a tip shape. The light converter 420 converts the image light 530a into the sensing light 530b. The image light 510a is incident on the light conversion unit 420 as light emitted from the photosensitive liquid crystal display panel 1. The sensing light 530b is emitted from the light conversion unit 420 toward the photosensitive liquid crystal display panel 1. In this case, the sensing light 530b and the image light 530a have different directions.

The light conversion unit 420 is made of a metal having high light reflectance, for example, aluminum, aluminum alloy, or the like.

The body 410 has a pen shape. In this embodiment, the body 410 is fixed to the light conversion unit 420. The body 410 may be manufactured in a wide variety of shapes according to the user's taste and use. In this embodiment, in order to further reduce the volume and weight of the light pen 400, the empty space 110 is formed inside the body 410.

According to the present exemplary embodiment, the light pen 400 intercepts a part of the image light 530a emitted from the photosensitive liquid crystal display panel 1 to generate the sensing light 530b for driving the second TFT 330. In this way, the light pen 400 does not need to consume energy to generate the sensing light 510b. Therefore, the number of components of the light pen 400 can be greatly reduced, and the volume and weight of the light pen 400 can also be reduced.                     

In order to drive the light sensing unit of the light sensing liquid crystal display device described in Embodiments 1 to 3, a light pen having a light emitting diode installed at the tip of the body may be used as in the prior art.

Optical Sensing Liquid Crystal Display System

Example 5

8 is a conceptual diagram illustrating a light sensing liquid crystal display system according to a fifth embodiment of the present invention.

Referring to FIG. 8, the photosensitive liquid crystal display system 500 includes a photosensitive liquid crystal display panel 1, a light pen 400, a detection signal processing unit 510, a driving module 520, and a backlight unit 230. Include.

Since the photosensitive liquid crystal display panel 1 has been described in detail in the first to third embodiments of the photosensitive liquid crystal display panel, a redundant description thereof will be omitted. The photosensitive liquid crystal display panel 1 may use any of the photosensitive liquid crystal display panels described in Embodiments 1 to 3, but in this embodiment, the photosensitive liquid crystal display panel 1 shown in Embodiment 3 is used. ) Was applied.

Since the light pen 400 is also described in detail in the fourth embodiment of the light pen, a duplicate description thereof will be omitted.

The sensing signal processing unit 510 is connected to the first sensor line 310. The detection signal processing unit 510 generates position data to which light is input by a signal output from the first sensor line 310.

The driving module 520 is electrically connected to the photosensitive liquid crystal display panel 1, the sensing signal processing unit 510, and the backlight unit 530. The driving module 520 applies various signals necessary for driving the photosensitive liquid crystal display panel 1 through the gate line 112, the data line 114, and the second sensor line 320, and the backlight unit 530. To control.

Although not shown, the driving module 520 may include a gate driver, a data driver, a driving voltage generator connected to the gate driver, a gray voltage generator connected to the data driver, a light source controller connected to the backlight assembly 530, and a signal controller for controlling them. Include.

The gate driver is connected to each gate line 112, and applies a gate driving signal to the gate line 112. The gate driving signal is generated in the driving voltage generator.

The data driver is connected to each data line 114 and selects and applies a gray voltage to the data line 114. The gray voltage is generated in the gray voltage generator.

The light source controller controls the backlight unit 530 that supplies light to the liquid crystal display panel 1.

The signal controller receives a video signal from an external information processing apparatus and controls a gate driver, a data driver, a driving voltage generator, and a gray voltage generator.

The backlight unit 530 is disposed to face the first substrate 10 and generates light.

The operation of the photosensitive liquid crystal display system configured as described above is as follows.                     

The data driver of the driving module 250 outputs the gray voltage applied from the gray voltage generator to each data line 112. At the same time, the gate driver sequentially applies the gate driving signal from the first gate line 112 according to the control signal output from the signal controller to turn on all the first TFTs 116 connected to the gate line 112. Accordingly, a driving voltage is applied from the drain electrode D of the first TFT 116 connected to the data line 114 intersecting the gate line 112 to which the gate driving signal is applied. The signal controller repeats this process for a limited time of one frame.

After the elapse of one frame, the pixel voltage is applied to all the pixel electrodes 120 formed on the first substrate 10, and the liquid crystal 30 includes the pixel voltage and the common electrode 200 of the second substrate 20. It is arranged by the common voltage applied to. Then, the image light 530a is generated while the light generated from the backlight unit 530 passes through the liquid crystal 30. The image light 530a passes through the second substrate 20 and is incident to the eyes of the worker.

Meanwhile, an operator senses the light 530b on the second TFT 330 of the light detector 300 using the light converter 420 of the light pen 400 to control the image generated by the image light 530a. ).

The sensing light 530b supplied from the light conversion unit 420 may include the light inflow unit 220 and the second TFT 330 formed by opening the color filter 210 corresponding to the second TFT 330. The light is incident on the channel layer C of the second TFT 330 through the second contact hole 134 formed in the corresponding portion. Since the light incident through the light inlet 220 and the second contact hole 134 and into the second TFT 330 is hardly lost, a large amount of light enters the channel layer C of the second TFT 330. do. Thus, the optical recognition rate of the second TFT 330 is increased to drive the second TFT 330.

When the second TFT 330 is driven, the first signal provided to the source electrode S of the second TFT 330 through the data line 114 is output to the drain electrode D of the second TFT 330. . The first signal is a data driving voltage applied to the pixel electrode 120 via the first TFT 116.

Thereafter, the third TFT 340 is driven by the second signal provided to the gate line 112. When the third TFT 340 is driven, the first signal output from the drain electrode D of the second TFT 330 is provided to the source electrode S of the third TFT 340. Therefore, the first signal is output to the first sensor line 310 through the drain electrode D of the third TFT 340. Here, the second signal is a gate driving voltage applied to the gate electrode G of the first TFT 116.

The first signal input to the first sensor line 310 is processed by the sensing signal processing unit and then output to the driving module 520. The driving module 520 outputs a processing signal to an external information processing apparatus. Then, the external information processing apparatus processes the processing signal and outputs a new video signal to the driving module 520. The photosensitive liquid crystal display panel 1, which receives the image signal output from the driving module 520, displays a new image.

As described in detail above, by opening or thinning the color filter of the portion corresponding to the portion where the light sensing unit is formed and opening the organic film of the portion corresponding to the second TFT, loss of the sensing light supplied from the light pen is reduced. Minimization improves the sensing sensitivity of the light detector. Therefore, there is an effect that can improve the reliability of the photosensitive liquid crystal display system.

In addition, since the light pen generates sensing light by using the image light emitted from the photosensitive liquid crystal display panel, the number of components of the light pen can be greatly reduced, and the volume and weight of the light pen can be reduced.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (9)

A first substrate transmitting light; Pixels arranged in a matrix form on the first substrate and including a pixel voltage applying device for outputting pixel voltage and a pixel electrode connected to the pixel voltage applying device to receive the pixel voltage; A light sensing unit formed on a predetermined portion of the pixel and outputting a signal having position information in response to light applied from the outside; A second substrate disposed to face the first substrate, the second substrate including a color filter formed at a portion corresponding to each of the pixels and a light inlet formed by opening a portion of the color filter corresponding to the light sensing unit; And And a liquid crystal disposed between the first substrate and the second substrate. The apparatus of claim 1, wherein the pixel voltage applying device is A plurality of gate lines formed along a first direction of the first substrate; A plurality of data lines formed along a second direction of the first substrate perpendicularly crossing the gate lines; And And a first thin film transistor connected to the gate line, the data line, and the pixel electrode. The method of claim 2, wherein the light detecting unit A second thin film transistor connected to the data line and driven by light applied from the outside to output a first signal provided to the data line; A third thin film transistor connected to the second thin film transistor and the gate line and outputting the first signal provided from the second thin film transistor in response to a second signal provided to the gate line; And And a first sensor line spaced apart from the data line along the second direction and connected to the third thin film transistor to receive the first signal and output position information. . The method of claim 3, wherein the first substrate further comprises an organic layer covering the pixel voltage applying device and the light sensing unit, and a portion of the organic layer corresponding to the second thin film transistor is lost of light incident to the second TFT. The liquid crystal display device, characterized in that the opening to prevent the. The liquid crystal display device according to claim 4, wherein the light inflow portion has a color filter thickness of a portion of the color filter corresponding to the second TFT is thinner than a color filter of another portion. The liquid crystal display of claim 4, wherein the light inlet is formed by disposing the color filter in a portion corresponding to each pixel except for a portion corresponding to the second TFT. Pixels including a first substrate for transmitting light, a pixel voltage applying device arranged in a matrix form on the first substrate, and a pixel electrode connected to the pixel voltage applying device to receive the pixel voltage. A light sensing unit formed at a predetermined portion of the pixel and outputting a signal having position information in response to light applied from the outside; and overlapping with the first substrate and formed at a portion corresponding to each of the pixels A liquid crystal display including a second filter including a color filter and a light inflow unit formed by opening a portion corresponding to the light sensing unit of the color filter, and a liquid crystal disposed between the first and second substrates; A light pen which generates sensing light necessary for driving the light sensing unit and emits the light to the light sensing liquid crystal display panel; And And a driving module for changing the arrangement of the liquid crystal by the signal having the positional information to generate image light. The liquid crystal display system of claim 7, wherein the light pen includes a body and a light conversion unit disposed at an end of the body and reflecting a part of the image light incident from the outside to generate the sensing light. The liquid crystal display system of claim 7, further comprising a backlight unit disposed at a portion facing the first substrate and configured to generate light required by the photosensitive liquid crystal display panel.

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