CN113848662A

CN113848662A - Liquid crystal handwriting board and control method thereof

Info

Publication number: CN113848662A
Application number: CN202111338356.2A
Authority: CN
Inventors: 王家星; 王修亮; 韩天洋; 武晓娟; 袁洪亮; 王建; 毕谣; 段金帅; 葛杨; 柳峰; 陈翠玉
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2021-12-28
Anticipated expiration: 2041-11-12
Also published as: CN113848662B

Abstract

The application discloses a liquid crystal handwriting board and a control method thereof, and belongs to the technical field of display. Liquid crystal handwriting panel includes: liquid crystal display panel, photosensitive component and control assembly. The light intensity of the ambient light transmitted from the area of the liquid crystal panel where the handwriting is present is different from the light intensity of the ambient light transmitted from the area of the liquid crystal panel where the handwriting is not present. Therefore, after photosensitive element sensing to the light intensity of the ambient light that sees through from each pixel region, control assembly can distinguish the region that has the handwriting and the region that does not have the handwriting based on the light intensity of the ambient light that sees through from each pixel region, and then makes control assembly can generate the image information who corresponds with the handwriting.

Description

Liquid crystal handwriting board and control method thereof

Technical Field

The application relates to the technical field of display, in particular to a liquid crystal handwriting board and a control method thereof.

Background

A handwriting pad is an electronic device for implementing writing and drawing of characters. The liquid crystal handwriting board has the advantages of low power consumption and clear handwriting, and the liquid crystal handwriting board is more and more widely applied in recent years.

In order to store the handwriting on the liquid crystal handwriting board, an infrared positioning device needs to be integrated in the liquid crystal handwriting board. The liquid crystal handwriting board can detect the moving track of the writing tool on the liquid crystal handwriting board according to the infrared positioning device, and then the liquid crystal handwriting board can realize the storage function of the handwriting.

However, the infrared positioning device in the liquid crystal handwriting board has low positioning accuracy, so that the liquid crystal handwriting board is very easy to generate a misrecognition phenomenon, and further the effect of storing the handwriting by the liquid crystal handwriting board is poor.

Disclosure of Invention

The embodiment of the application provides a liquid crystal handwriting board and a control method thereof. The problem that the effect of storing the handwriting by the liquid crystal handwriting board in the prior art is poor can be solved, and the technical scheme is as follows:

in one aspect, a liquid crystal writing pad is provided, including: the method comprises the following steps: the liquid crystal display device comprises a liquid crystal panel, a photosensitive assembly and a control assembly;

the liquid crystal panel has a plurality of pixel regions arranged in an array, and includes: the liquid crystal display panel comprises an array substrate, a flexible substrate and a liquid crystal layer, wherein the array substrate and the flexible substrate are oppositely arranged, and the liquid crystal layer is positioned between the array substrate and the flexible substrate;

the photosensitive component comprises a plurality of photosensitive elements, one photosensitive element corresponds to at least one pixel region, and the orthographic projection of the photosensitive elements on the liquid crystal panel at least partially overlaps with the corresponding at least one pixel region;

the control component is electrically connected with the liquid crystal panel and the photosensitive component respectively, and is configured to: and detecting the light intensity of the ambient light irradiating each pixel area through the photosensitive assembly, and generating image information corresponding to the handwriting based on the light intensity.

Optionally, the photosensitive element is integrated in the liquid crystal panel, and the photosensitive element includes: the first photosensitive transistors correspond to the pixel regions one by one, and are positioned in the corresponding pixel regions;

the photosensitive assembly further includes: the first sensing signal line corresponds to at least one first photosensitive transistor, the first sensing signal line is electrically connected with each corresponding first photosensitive transistor, and the first sensing signal line is further electrically connected with the control component.

Optionally, the photosensitive assembly further includes: a plurality of first photosensitive signal lines, one of which is electrically connected to the first electrode of each first photosensitive transistor in a row of the pixel regions, and the first photosensitive signal line is further electrically connected to the control component;

the second poles of the first phototransistors corresponding to one first sensing signal line are connected in series, and one first sensing signal line is electrically connected with the current output ends of the first phototransistors.

Optionally, the photosensitive assembly further includes: a first transfer electrode electrically connected to the second pole of the first phototransistor;

the plurality of first photosensitive transistors corresponding to one first sensing signal line are arranged in a plurality of rows and a plurality of columns, one row of first switching electrodes electrically connected with the second poles of the first photosensitive transistors in one row are connected in series through a first connecting line, and one column of first switching electrodes electrically connected with the second poles of the first photosensitive transistors in one column are connected in series through a second connecting line;

the current output terminals of a plurality of the first phototransistors corresponding to one of the first sensing signal lines are: one of a plurality of first transfer electrodes electrically connected to second poles of the plurality of first phototransistors.

Optionally, the first connection line and the gate of the first phototransistor are arranged in the same layer and made of the same material;

the first sensing signal line, the first photosensitive signal line and the second connecting line are arranged in the same layer as the first pole and the second pole of the first photosensitive transistor and are made of the same material.

Optionally, the liquid crystal layer includes: a layer of bistable liquid crystal molecules;

the bistable liquid crystal molecules in the bistable liquid crystal molecule layer are configured to: after the liquid crystal panel is subjected to external pressure, the focal conic texture is converted into a plane texture; the voltage difference in the pixel area to be erased in the liquid crystal handwriting board changes from a plane texture into a focal conic texture

Optionally, the liquid crystal handwriting board further includes: the environment light detection assembly is electrically connected with the control assembly;

the control component is further configured to: detecting first light intensity of ambient light after the ambient light penetrates through a first test area in the liquid crystal panel through the ambient light detection assembly to determine a first preset light intensity range, and/or detecting second light intensity of the ambient light after the ambient light penetrates through a second test area in the liquid crystal panel through the ambient light detection assembly to determine a second preset light intensity range, wherein the first test area is an area corresponding to handwriting displayed in the liquid crystal panel, and the second test area is an area corresponding to the handwriting not displayed in the liquid crystal panel;

the control component is further configured to: the method comprises the steps of detecting light intensity of ambient light irradiating each pixel area through the photosensitive assembly, determining the pixel area with the light intensity within a first preset light intensity range as a first area with writing handwriting, and/or determining the pixel area with the light intensity within a second preset light intensity range as a second area without writing handwriting, and generating image information corresponding to the writing handwriting based on position information of the first area and/or position information of the second area.

Optionally, the ambient light detection assembly is integrated in the liquid crystal panel, and the ambient light detection assembly includes: a plurality of first test transistors in series within the first test area, and a plurality of second test transistors in series within the second test area.

Optionally, the plurality of first test transistors and the plurality of second test transistors correspond to each other one to one;

the grid electrode of one first test transistor is electrically connected with the grid electrode of the corresponding second test transistor through one test grid line;

the first poles of the first test transistors are connected in series through a first test signal line, and the second poles of the first test transistors are connected in series through a second test signal line;

the first poles of the second test transistors are connected in series through a third test signal line, and the second poles of the first test transistors are connected in series through a fourth test signal line.

Optionally, the liquid crystal layer includes a bistable liquid crystal molecular layer, the first test transistor and the second test transistor are integrated in the array substrate, the bistable liquid crystal molecules in the first test region are in a planar texture, and the bistable liquid crystal molecules in the second test region are in a focal conic texture.

Optionally, the array substrate includes: a pixel electrode located in the pixel region, the flexible substrate including: a common electrode;

the control component is further configured to: and detecting the position information of the target light irradiated on the liquid crystal panel through the photosensitive assembly to determine the position information of the pixel area to be erased, and applying pixel voltage to the pixel electrode in the pixel area to be erased so as to form a voltage difference between the pixel electrode in the pixel area to be erased and the common electrode.

Optionally, the photosensitive element is integrated in the liquid crystal panel, and the photosensitive element includes: the second photosensitive transistors correspond to the pixel regions one by one, and are positioned in the corresponding pixel regions;

the photosensitive assembly further includes: and one of the second sensing signal lines corresponds to at least one of the second phototransistors, the second sensing signal line is electrically connected with each corresponding second phototransistor, and the second sensing signal line is also electrically connected with the control component.

Optionally, the array substrate further includes: a driving transistor electrically connected to the pixel electrode, when the photosensitive element includes: and when the first photosensitive transistor and the second photosensitive transistor are used, the driving transistor, the first photosensitive transistor and the second photosensitive transistor are arranged in the same layer.

Optionally, the photosensitive element is located on a side of the array substrate facing away from the flexible substrate;

the photosensitive element includes: the circuit board, and be located a plurality of light-sensitive elements on the circuit board, a plurality of light-sensitive elements all with the circuit board electricity is connected, just the circuit board with control assembly electricity is connected.

In another aspect, a method for controlling a liquid crystal handwriting pad is provided, where the method is applied to the liquid crystal handwriting pad, and the method includes:

detecting the light intensity of the ambient light irradiating each pixel region through the photosensitive assembly;

and generating image information corresponding to the handwriting based on the light intensity of the ambient light irradiating each pixel area.

Optionally, the liquid crystal panel includes: array substrate and flexible substrate that relative setting, the array substrate includes: a pixel electrode located in the pixel region, the flexible substrate including: a common electrode; the method further comprises the following steps:

and detecting the position information of the target light irradiated on the liquid crystal panel through the photosensitive assembly to determine the position information of the pixel area to be erased, and applying pixel voltage to the pixel electrode in the pixel area to be erased so as to form a voltage difference between the pixel electrode in the pixel area to be erased and the common electrode.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

a liquid crystal handwriting panel comprising: liquid crystal display panel, photosensitive component and control assembly. The light intensity of the ambient light transmitted from the area of the liquid crystal panel where the handwriting is present is different from the light intensity of the ambient light transmitted from the area of the liquid crystal panel where the handwriting is not present. Therefore, after photosensitive element sensing to the light intensity of the ambient light that sees through from each pixel region, control assembly can distinguish the region that has the handwriting and the region that does not have the handwriting based on the light intensity of the ambient light that sees through from each pixel region, and then makes control assembly can generate the image information who corresponds with the handwriting. The photosensitive components do not need to protrude out of the display surface of the liquid crystal panel and do not need to be distributed around the liquid crystal panel, so that the thickness of the liquid crystal handwriting board can be effectively reduced, and the screen occupation ratio of the liquid crystal handwriting board is improved. And when the mode of detecting the ambient light through the photosensitive assembly realizes the storage of the handwriting, the accuracy of storing the handwriting can be improved, and the effect of storing the handwriting by the liquid crystal handwriting board is better. Simultaneously, writing the in-process, need not to let photosensitive element continuously work, only need when having the save demand let photosensitive element work can, the effectual consumption that reduces the liquid crystal handwriting pad, and can guarantee that all writing handwriting that present on the liquid crystal handwriting pad all can be preserved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a top view of a liquid crystal writing pad provided in the related art;

FIG. 2 is a cross-sectional view of the liquid crystal writing pad shown in FIG. 1 at A-A';

FIG. 3 is a schematic structural diagram of a liquid crystal handwriting board provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of another liquid crystal handwriting board provided in the present application;

fig. 5 is a top view of the array substrate shown in fig. 4;

FIG. 6 is a schematic diagram illustrating a distribution of a plurality of first sensing signal lines according to an embodiment of the present disclosure;

FIG. 7 is a schematic view of a film structure of the array substrate shown in FIG. 5 at A-A';

fig. 8 is a top view of another array substrate shown in fig. 4;

FIG. 9 is a schematic diagram illustrating a distribution of a plurality of second sensing signal lines according to an embodiment of the present disclosure;

FIG. 10 is a schematic view of a film structure of the array substrate shown in FIG. 8 at B-B';

fig. 11 is a plan view of still another array substrate shown in fig. 4;

fig. 12 is a top view of still another array substrate shown in fig. 4;

FIG. 13 is a schematic structural diagram of another liquid crystal handwriting pad provided in the present application;

fig. 14 is a top view of an array substrate, a black matrix and a photosensitive element stacked according to an embodiment of the present disclosure;

fig. 15 is a top view of a black matrix in the structure shown in fig. 14;

FIG. 16 is a top view of a photosensitive element in the configuration shown in FIG. 14;

FIG. 17 is a top view of an array substrate in the liquid crystal writing pad shown in FIG. 13;

FIG. 18 is a schematic view of a film structure of the array substrate shown in FIG. 17 at C-C';

FIG. 19 is a schematic view of another film structure of the array substrate shown in FIG. 17 at C-C';

FIG. 20 is a schematic diagram of a film structure of a photosensitive element according to an embodiment of the present disclosure;

FIG. 21 is a top view of an ambient light detection assembly on a liquid crystal writing pad according to an embodiment of the present application;

fig. 22 is a schematic structural diagram of an ambient light detection assembly according to an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In the related art, please refer to fig. 1 and fig. 2, fig. 1 is a top view of a liquid crystal writing pad provided in the related art, and fig. 2 is a cross-sectional view of the liquid crystal writing pad shown in fig. 1 at a-a'. Liquid crystal tablet 00 may generally include: a liquid crystal panel 01 and an infrared positioning device 02.

Among them, the liquid crystal panel 01 may include: the liquid crystal display panel includes an array substrate 011 and a flexible substrate 012 disposed opposite to each other, and a liquid crystal layer 013 interposed therebetween. The array substrate 011 generally has a plurality of pixel electrodes (not shown) arranged in an array, the flexible substrate 012 has a planar common electrode 0121, and the liquid crystal molecules in the liquid crystal layer 013 can be bistable liquid crystal molecules.

The infrared positioning device 02 in the liquid crystal handwriting board 00 is positioned at the periphery of the liquid crystal panel 01 for a circle, and the infrared positioning device 02 is higher than the display surface of the liquid crystal panel 01. The infrared positioning device 02 may emit an infrared light so that the liquid crystal writing pad 00 may position the position of an external object (e.g., a writing tool or an erasing tool) on the liquid crystal writing pad 00 by emitting the infrared light by the infrared positioning device 02.

When the liquid crystal writing pad 00 is in a writing mode, a writing tool 03 (e.g., a writing pen) may apply pressure to the liquid crystal panel 01, so that a portion of liquid crystal molecules in a liquid crystal layer 013 in the liquid crystal panel 01 is changed from a focal conic texture to a planar texture by the external pressure. In this way, the liquid crystal molecules converted into the planar texture can reflect light with a certain wavelength (for example, green light) in the incident ambient light, so that the liquid crystal writing pad 00 can display writing. In addition, in the writing process of the writing tool 03, the moving track of the writing tool 03 can be determined through the infrared positioning device 02, so that the liquid crystal writing pad 00 can generate image information corresponding to the writing handwriting based on the moving track. Subsequently, the liquid crystal writing pad 00 may send the image information to another display device (e.g., a computer or a mobile phone), so that the other display device can also display the writing on the liquid crystal writing pad 00.

However, when the infrared positioning device 02 is integrated in the liquid crystal writing pad 00, the infrared positioning device 02 needs to be higher than the display surface of the liquid crystal panel 01 to ensure that the infrared positioning device 02 can normally operate, which results in a relatively large thickness and a relatively low screen occupation ratio of the liquid crystal writing pad 00.

Moreover, the infrared positioning device 02 has low recognition accuracy. For example, when the user writes with the writing tool 03, the hand of the user is easily recognized as the writing tool 03 by mistake by the infrared positioning device 02, and thus the infrared positioning device 02 also generates image information corresponding to the handwriting based on the movement trajectory of the hand. Thus, the effect of storing the handwriting by the liquid crystal handwriting board 00 is poor.

Meanwhile, if all the handwriting on the liquid crystal handwriting board 00 is to be stored, the infrared positioning device 02 needs to be kept in an on state all the time in the whole writing process. Thus, the power consumption of the liquid crystal writing pad 00 is large.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a liquid crystal handwriting board according to an embodiment of the present application. The liquid crystal handwriting pad 000 may include:

a liquid crystal panel 100, a photosensitive element 200, and a control element 300.

The liquid crystal panel 100 has a plurality of pixel regions 101a (not shown in fig. 3, but shown in fig. 5) arranged in an array. For example, the liquid crystal panel 100 may include: the array substrate 101 and the flexible substrate 102 are oppositely arranged. The array substrate 101 may have a plurality of gate lines and a plurality of data lines, an extending direction of the gate lines is perpendicular to an extending direction of the data lines, and any two adjacent gate lines and any two adjacent data lines can enclose a pixel region 101 a.

In the embodiment of the present application, the liquid crystal panel 100 may further include: and a liquid crystal layer 103 between the array substrate 101 and the flexible substrate 102. The liquid crystal layer 103 may be a bistable liquid crystal molecular layer, that is, the liquid crystal molecules in the liquid crystal layer 103 are bistable liquid crystal molecules. Illustratively, the bistable liquid crystal molecules are configured to: when the liquid crystal panel 100 in the liquid crystal handwriting board 000 is subjected to external pressure, the focal conic texture is changed into the planar texture. For example, when a user writes on the liquid crystal handwriting board 000 by a writing tool, the user may apply pressure to the liquid crystal panel 100 by the writing tool, so that the bistable liquid crystal molecules in the area of the liquid crystal panel 000 subjected to the pressure are transformed from the focal conic texture to the planar texture. In this case, the bistable liquid crystal molecules with planar texture can reflect light (e.g., green light) with a certain wavelength from the ambient light irradiated on the liquid crystal panel 100, so that the liquid crystal handwriting board 000 can display corresponding handwriting.

The photosensitive element 200 has a plurality of photosensitive elements 200a, one photosensitive element 200a corresponds to at least one pixel region 101a, and an orthographic projection of the photosensitive element 200a on the liquid crystal panel 100 at least partially overlaps the corresponding at least one pixel region 101 a. In the present application, each of the photosensitive elements 200a in the photosensitive assembly 200 may correspond to at least one pixel region 101 a.

The control unit 300 is electrically connected to the liquid crystal panel 100 and the photosensitive unit 200, respectively. For example, the control component 300 may be electrically connected to each pixel region 101a in the liquid crystal panel 100, and the control component 300 may also be electrically connected to each photosensitive element 200a in the photosensitive component 200.

Wherein the control component 300 may be configured to: the light intensity of the ambient light irradiated in each pixel region 101a in the liquid crystal panel 100 is detected by the photosensitive element 200, and image information corresponding to the handwriting is generated based on the light intensity of the ambient light irradiated in each pixel region 101a in the liquid crystal panel 100.

In the liquid crystal panel 100, the bistable liquid crystal molecules in the area where the writing is present are in a planar texture, and the bistable liquid crystal molecules in the area where the writing is not present are in a focal conic texture. The bistable liquid crystal molecules in the planar texture can reflect light with a certain wavelength in ambient light, and the bistable liquid crystal molecules in the focal conic texture can transmit all the ambient light. In this way, the light intensity of the ambient light transmitted through the area of the liquid crystal panel 100 where the handwriting is present is different from the light intensity of the ambient light transmitted through the area of the liquid crystal panel 100 where the handwriting is not present. Like this, after photosensitive element 200 sensing to the light intensity of the ambient light that sees through from each pixel region, control assembly can distinguish the region that has the handwriting and the region that does not have the handwriting based on the light intensity of the ambient light that sees through from each pixel region, and then makes control assembly can generate the image information who corresponds with the handwriting.

In this embodiment, after a certain photosensitive element 200a in the photosensitive element 200 senses the light intensity of the ambient light, the control element 300 may determine the light intensity sensed by the photosensitive element 200a as the light intensity of the ambient light after the ambient light is transmitted from the pixel region 101a corresponding to the photosensitive element 200a according to the corresponding relationship between the photosensitive element 200a and the pixel region 101a in the photosensitive element 200. In this way, the control component 300 can determine whether writing handwriting exists in the pixel region 101a corresponding to the photosensitive element 200a through the light intensity sensed by the photosensitive element 200 a.

For example, when the control component 300 determines that the light intensity sensed by a certain photosensitive element 200a is within a first preset light intensity range, the control component may determine that writing handwriting exists in the pixel region 101a corresponding to the photosensitive element 200 a. Wherein, the first preset light intensity range is: the light intensity range of the ambient light after being transmitted from the area where the handwriting is present in the liquid crystal panel 100.

When the control component 300 determines that the light intensity sensed by a certain photosensitive element 200a is within the second preset light intensity range, the control component may determine that no writing handwriting exists in the pixel region 101a corresponding to the photosensitive element 200 a. Wherein the second preset light intensity range is: the light intensity range of the ambient light after being transmitted from the area where no handwriting is present in the liquid crystal panel 100.

In this case, the control component 300 may detect the light intensity of the ambient light irradiating each pixel region through the photosensitive component, determine the pixel region having the light intensity within a first preset light intensity range as a first region where the handwriting exists, and/or determine the pixel region having the light intensity within a second preset light intensity range as a second region where the handwriting does not exist, and generate image information corresponding to the handwriting based on the position information of the first region and/or the position information of the second region.

To sum up, the liquid crystal handwriting panel provided by the embodiment of the application comprises: liquid crystal display panel, photosensitive component and control assembly. The light intensity of the ambient light transmitted from the area of the liquid crystal panel where the handwriting is present is different from the light intensity of the ambient light transmitted from the area of the liquid crystal panel where the handwriting is not present. Therefore, after photosensitive element sensing to the light intensity of the ambient light that sees through from each pixel region, control assembly can distinguish the region that has the handwriting and the region that does not have the handwriting based on the light intensity of the ambient light that sees through from each pixel region, and then makes control assembly can generate the image information who corresponds with the handwriting. The photosensitive components do not need to protrude out of the display surface of the liquid crystal panel and do not need to be distributed around the liquid crystal panel, so that the thickness of the liquid crystal handwriting board can be effectively reduced, and the screen occupation ratio of the liquid crystal handwriting board is improved. And when the mode of detecting the ambient light through the photosensitive assembly realizes the storage of the handwriting, the accuracy of storing the handwriting can be improved, and the effect of storing the handwriting by the liquid crystal handwriting board is better. Simultaneously, writing the in-process, need not to let photosensitive element continuously work, only need when having the save demand let photosensitive element work can, the effectual consumption that reduces the liquid crystal handwriting pad, and can guarantee that all writing handwriting that present on the liquid crystal handwriting pad all can be preserved.

In the embodiment of the present application, as shown in fig. 3, the array substrate in the liquid crystal handwriting board 000 may include a pixel electrode 1011 located in the pixel region 101 a. For example, one pixel electrode 1011 may be disposed in each pixel region 101a of the array substrate 101, and the pixel electrode 1011 may be a block-shaped electrode.

The flexible substrate 102 in the liquid crystal panel 100 has a common electrode 1021, and the common electrode 1021 in the flexible substrate 102 may be a planar electrode, that is, the common electrode 1021 is a full-layer electrode.

The control member 300 may be electrically connected to each pixel electrode 1011 in the liquid crystal panel 100. Wherein the control component 300 may be configured to: the position information of the target light irradiated on the liquid crystal panel 100 is detected by the photosensitive element 200 to determine the position information of the pixel area 101a to be erased, and a pixel voltage is applied to the pixel electrode 1011 in the pixel area 101a to be erased, so that a voltage difference is formed between the pixel electrode 1011 and the common electrode 1021 in the pixel area 101a to be erased.

In the embodiment of the present application, when the writing displayed on the liquid crystal writing pad 000 needs to be erased, an erasing tool capable of emitting the target light may be used to erase the writing. After the erasing tool emits the target light to the liquid crystal panel 100, the photosensitive element 200a in the photosensitive element 200 may sense the target light emitted by the erasing tool and transmitted through the liquid crystal panel 100, and determine the position of the target light irradiated on the liquid crystal panel 100 through the control element 300, where the position of the light irradiated on the liquid crystal panel 000 is the position of the pixel region to be erased. The control component 300 causes the handwriting in the pixel area to be erased according to the position of the pixel area to be erased.

For example, the control component 300 may determine the position of the pixel region 101a corresponding to a certain photosensitive element 200a in the photosensitive component 200 by sensing the target light emitted by the erasing tool and the corresponding relationship between the photosensitive element 200a and the pixel region 101 a. Thus, the control component 300 can determine the position information of the pixel region 101a to be erased by the light irradiated on the liquid crystal panel 100 based on the position of the pixel region 101a corresponding to the photosensitive element.

In this way, the lcd handwriting board 000 can detect the position information of the pixel area to be erased through the photosensitive element 200, and then, the lcd handwriting board 000 can apply the pixel voltage to the pixel electrode 1011 in the pixel area 101a to be erased through the control element 300, so that a voltage difference is formed between the pixel electrode 1011 and the common electrode 1021 in the pixel area 101a to be erased. Illustratively, the bistable liquid crystal molecules are further configured to: after a voltage difference is formed between the pixel electrode 1011 and the common electrode 1021 in the erased pixel region 101a, the planar texture is changed into the focal conic texture. For example, when a user erases the liquid crystal handwriting pad 000 by using an erasing tool capable of emitting light, the user may emit target light to the liquid crystal panel 100 by using the erasing tool, so that the control component 300 may determine the pixel area 101a to be erased, and apply a pixel voltage to the pixel electrode 1011 in the pixel area 101a to be erased, so that a voltage difference is formed between the pixel electrode and the common electrode 1021, thereby restoring the bistable liquid crystal molecules in the pixel area 101a to be erased in the liquid crystal panel 000 from the planar texture to the focal conic texture. In this way, the bistable liquid crystal molecules in the focal conic texture can transmit the ambient light irradiated on the liquid crystal panel 100, so as to erase the writing in the pixel region 101a to be erased.

It should be noted that, in order to make the photosensitive element 200 distinguish the target light from the ambient light, it is necessary to ensure that the light intensity of the target light is much greater than that of the ambient light. And because the photosensitive element 200 is generally located on the side of the liquid crystal layer 103 in the liquid crystal panel 100 away from the flexible substrate 102. Therefore, the object light generally needs to pass through the liquid crystal layer 103 and then be emitted to the photosensitive element 200. When the bistable liquid crystal molecules in the liquid crystal panel 000 are in the planar texture, the bistable liquid crystal molecules can reflect green light, and therefore, in order to allow the target light to normally pass through the bistable liquid crystal molecules in the planar texture, it is necessary to ensure that the target light is light of a color other than the color of the green light. For example, the target light may be white light, red light, blue light, or the like.

In the embodiment of the present application, there are various structures of the photosensitive element 200 in the liquid crystal handwriting board 000, and the embodiment of the present application is schematically illustrated by taking the following two alternative implementation manners as examples:

referring to fig. 4, fig. 4 is a schematic structural diagram of another liquid crystal handwriting board according to another implementation manner of the present application. The photosensitive elements 200 in the lc handwriting pad 000 can be integrated into the lc panel 100, so that the thickness of the lc handwriting pad 000 can be further reduced.

In the embodiment of the present application, the photosensitive element 200a in the photosensitive assembly 200 may include: a first phototransistor 201 and a second phototransistor 202. The plurality of first phototransistors 201 correspond to the plurality of pixel regions 101a one to one, and the first phototransistors 201 are located in the corresponding pixel regions 101 a; the plurality of second photo transistors 202 are in one-to-one correspondence with the plurality of pixel regions 101a, and the second photo transistors 202 are located in the corresponding pixel regions 101 a.

Illustratively, the first phototransistor 201 is configured to sense the light intensity of the ambient light transmitted from each pixel region, and distinguish between a region where writing is present and a region where writing is not present by the control component 300, thereby generating image information corresponding to the writing.

The second phototransistor 202 is used for sensing the target light emitted by the erasing tool and transmitted through the liquid crystal panel 100, and determining the position of the target light irradiated on the liquid crystal panel 100 through the control component 300, thereby determining the position information of the pixel region 101a to be erased.

It should be noted that, since the driving transistor 1016 electrically connected to the pixel electrode 1011 is usually disposed in the array substrate 101 of the liquid crystal panel 100, in order to simplify the manufacturing difficulty of the liquid crystal panel, the first phototransistor 201 and the second phototransistor 202 in the photosensitive element 200 may be integrated in the array substrate 101 of the liquid crystal panel 100. It should be noted that, because the control component in the liquid crystal handwriting board 000 can sense the light intensity of the external light through the first photo transistor 201, and can also sense the light intensity of the external light through the second photo transistor 202. Therefore, the first phototransistor 201 and the second phototransistor 202 can be combined to be a transistor, which reduces the manufacturing cost of the liquid crystal writing pad 000 and improves the integration of the liquid crystal writing pad 000.

The following embodiments will schematically illustrate the operation of the first phototransistor 201 and the second phototransistor 202 in the following two aspects:

in a first aspect, referring to fig. 5, fig. 5 is a top view of the array substrate shown in fig. 4. The photosensitive elements 200 in the lc handwriting pad 000 may further include: the plurality of first sensing signal lines S1, one first sensing signal line S1 corresponds to at least one first phototransistor 201, the first sensing signal line S1 is electrically connected to each corresponding first phototransistor 201, and the first sensing signal line S1 is further electrically connected to the control device 300.

In the embodiment of the present application, after the first phototransistor 201 is irradiated by the ambient light with different light intensities, the magnitude of the current generated by the first phototransistor 201 is different, and the current generated by the first phototransistor 201 under the irradiation of the ambient light can be transmitted to the control component 300 through the first sensing signal line S1 electrically connected to the first phototransistor 201, so that the control component 300 can determine the light intensity of the ambient light irradiated on the first phototransistor 201 based on the corresponding relationship between the current and the light intensity. The intensity of the ambient light impinging on the first phototransistor 201 is: the intensity of the ambient light passing through the pixel region 101a where the first phototransistor 201 is located.

In the present application, each of the first sensing signal lines S1 corresponds to a plurality of first phototransistors 201 corresponding to the first phototransistors 201. The number of the first photo transistors 201 corresponding to each of the first sensing signal lines S1 is the same. In this case, referring to fig. 6, fig. 6 is a distribution diagram of a plurality of first sensing signal lines according to an embodiment of the present disclosure, a plurality of pixel regions where a plurality of first photo transistors 201 corresponding to one first sensing signal line S1 are located can form one photosensitive region 201a, and the size of each photosensitive region 201a is the same. For example, the plurality of pixel regions in each photosensitive region 201a may be arranged in three rows and three columns. The number of the first sensing signal lines S1 is the same as the number of the photosensitive regions 201a, and each of the first sensing lines 204 may be electrically connected to a respective first phototransistor 201 in the photosensitive region 201 a.

For example, since handwriting when a user writes on the liquid crystal handwriting board 000 by a writing tool is generally wide, the width of the pixel area 101a is generally small. Therefore, in order to improve the accuracy of saving handwriting, one photosensitive area 201a may be composed of a plurality of pixel areas 101 a. After any one of the pixel regions 101a receives the irradiation of the ambient light, the light can be detected by the corresponding first phototransistor 201, so that the writing script displayed in the region formed by the pixel regions 101a can be saved. In the liquid crystal handwriting board 000, the size of a single photosensitive area 201a can be adjusted by adjusting the corresponding relationship between the plurality of first sensing lines 204 and the plurality of first phototransistors 201, so as to adjust and control the size of the minimum storage area.

Optionally, the first phototransistor 201 in the photosensitive element 200 includes: the semiconductor device includes a gate, a first pole, a second pole and an active layer. The first pole and the second pole are both in lap joint with the active layer, and a grid insulating layer is arranged between the active layer and the grid. It should be noted that the first pole of the first phototransistor 201 may be one of a source and a drain, and the second pole may be the other of the source and the drain. The first phototransistor 201 may be a bottom gate TFT or a top gate TFT, which is not limited in this embodiment.

The photosensitive element 200 in the liquid crystal handwriting pad 000 further includes: a plurality of first photosensitive signal lines L1, a first photosensitive signal line L1 is electrically connected to the first electrode of each first photosensitive transistor 201 in a column of pixel regions 101a, and the first photosensitive signal line L1 is further electrically connected to the control element 300.

One first sensing signal line S1 is connected in series with the second pole of the corresponding first photo transistors 201, and one first sensing signal line S1 is electrically connected with the current output terminal 2011 of the corresponding first photo transistors 201.

The photosensitive element 200 further includes: a plurality of first gate lines G1, a first gate line G1 is electrically connected to the gate of each first phototransistor 201 in a row of pixel regions 101a, and the first gate line G1 is also electrically connected to the control element 300.

In the embodiment of the present application, when the writing handwriting presented on the liquid crystal writing pad 000 needs to be stored, the first phototransistor 201 in the liquid crystal writing pad 000 needs to be in an operating state. In this case, the control assembly 300 may apply a gate voltage to the first gate line G1 and a data voltage to the first light-sensitive signal line L1. Under the irradiation of the ambient light, the number of hole-electron pairs in the active layer of the first phototransistor 201 increases, so that the leakage current in the first phototransistor 201 increases, that is, the first and second poles of the first phototransistor 201 are turned on, and the first photo-sensitive signal line L1 can apply the data voltage to the first sensing signal line S1 through the first and second poles of the first phototransistor 201. Thus, the control component 300 can determine the intensity of the ambient light impinging on the first phototransistor 201 by detecting the magnitude of the current of the electrical signal transmitted through the first sensing signal line S1.

It should be noted that, since one first sensing signal line S1 is connected in series with the second poles of the plurality of first phototransistors 201. Therefore, after the first sensing signal line S1 is electrically connected to the current output terminals 2011 of the plurality of first phototransistors 201, the current of the electrical signal transmitted by the first phototransistors 201 is the total current outputted by the second terminals of the plurality of first phototransistors 201 after the ambient light irradiates the plurality of first phototransistors 201. Thus, the control component 300 can determine the intensity of the ambient light irradiating on each of the first photo-transistors 201 according to the current of the electrical signal transmitted through the first sensing signal line S1 and the number of the first photo-transistors 201 corresponding to the first sensing signal line S1.

In the embodiment of the present application, please refer to fig. 5 and 7, and fig. 7 is a schematic diagram of a film structure of the array substrate shown in fig. 5 at a-a'. The photosensitive element 200 in the liquid crystal handwriting pad 000 further includes: a first switching electrode 201' electrically connected to a second pole of the first phototransistor 201.

The plurality of first photo-transistors 201 corresponding to one first sensing signal line S1 are arranged in a plurality of rows and columns, a row of first transfer electrodes 201 'electrically connected to the second poles of the row of first photo-transistors 201 are connected in series by a first connection line 2012, and a column of first transfer electrodes 201' electrically connected to the second poles of the column of first photo-transistors 201 are connected in series by a second connection line 2013.

The current output 2011 of the first photo-transistors 201 corresponding to one first sensing signal line S1 is: one of a plurality of first transfer electrodes 201' electrically connected to the second poles of the plurality of first photo transistors 201. It should be noted that the current output 2011 of the plurality of first phototransistors 201 corresponding to one first sensing signal line S1 refers to: the plurality of first phototransistors 201 are the convergence ends of the current transmitted under the irradiation of the ambient light, and for this reason, the first switching electrode 201 'positioned at the lower left corner among the plurality of first switching electrodes 201' in fig. 5 is the current output end 2011.

In this case, by configuring one first transfer electrode 201 ' electrically connected to the second pole of each first phototransistor 201, the overlapping area when electrically connected to the second pole of the first phototransistor 201 can be increased, and one row of first transfer electrodes 201 ' is connected in series through the first connection line 2012, and one column of first transfer electrodes 201 ' is connected in series through the second connection line 2013, so as to be connected in series with one first sensing signal line S1 and the second poles of the corresponding plurality of first phototransistors 201. In addition, the first sensing signal line S1 may be electrically connected to the second poles of the corresponding first phototransistors 201 through the first transfer electrode 201', so that the electrical connection between the first sensing signal line S1 and the second poles of the corresponding first phototransistors 201 is simplified.

For example, in the array substrate 101, the first switching electrode 201 'may be disposed on the same layer and have the same material as the pixel electrode 1011, and the pixel electrode 1011 and the first switching electrode 201' may be insulated from each other by the slit d 1; the extending direction of the first connecting line 2012 may be parallel to the extending direction of the first gate line G1, so that the first connecting line 2012, the first gate line G1 and the gate electrode of the first phototransistor 201 are disposed in the same layer and have the same material; the extending direction of the second connection line 2013 may be parallel to the extending direction of the first photo-sensitive signal line L1, so that the second connection line 2013, the first photo-sensitive signal line L1 and the first and second electrodes in the first photo-transistor 201 are disposed at the same layer and have the same material.

In the present application, a first insulating layer 1014 exists between the first relay electrode 201' and the second pole of the first phototransistor 201, and the first insulating layer 1014 has a plurality of first vias V1. Among the plurality of first vias V1, a portion of the first vias V1 is used to connect the first switching electrode 201 'with the second pole in the first phototransistor 201, and another portion of the first vias V1 is used to connect the first switching electrode 201' with the second connection line 2013.

A gate insulating layer 1013 is present between the active layer and the gate of the first phototransistor 201, and the gate insulating layer 1013 and the first insulating layer 1014 have a second via V2 communicating with each other. The second via V2 is used to connect the first switching electrode 201' and the first connection line 2012.

It should be noted that, in the above-mentioned embodiment and the following embodiments, a part and another part are disposed in the same layer and the same material means: the two portions are formed by a single patterning process. For example, the pixel electrode 1011 and the first transfer electrode 201' are formed by a single patterning process. Here, the one-time patterning process means: photoresist coating, exposure, development, etching and photoresist stripping.

In the embodiment of the present application, when the writing trace displayed on the liquid crystal writing pad 000 needs to be stored, the control component 300 in the liquid crystal writing pad 000 may determine the magnitude of the current generated by each of the first photo transistors 201 under the irradiation of the ambient light through the current of the electrical signal transmitted through each of the first sensing signal lines S1 and the number of the first photo transistors 201 corresponding to the first sensing signal line S1. Then, the control component 300 further distinguishes an area where the writing trace exists and an area where the writing trace does not exist on the liquid crystal handwriting board 000 according to the current magnitude on each first phototransistor 201 and the intensity of the ambient light corresponding to the current magnitude, so as to generate image information corresponding to the writing trace.

Referring to fig. 8, fig. 8 is a top view of another array substrate shown in fig. 4. The photosensitive elements 200 in the lc handwriting pad 000 may further include: the plurality of second sensing signal lines S2, one second sensing signal line S2 corresponds to at least one second phototransistor 202, the second sensing signal line S2 is electrically connected to each corresponding second phototransistor 202, and the second sensing signal line S2 is further electrically connected to the control device 300.

In the embodiment of the present application, when the writing on the liquid crystal writing pad 000 needs to be erased, an erasing tool capable of emitting the target light needs to be used to erase the writing. After a second photo transistor 202 in the photo sensor device 200 receives the target light, the second photo transistor 202 generates a current, and the current generated by the second photo transistor 202 can be transmitted to the control device 300 through the second sensing signal line S2 electrically connected thereto, so that the control device 300 can determine the pixel region 101a where the second photo transistor 202 is located as the pixel region to be erased.

In the present application, each of the second sensing signal lines S2 corresponds to a plurality of second photo transistors 202. The number of the second photo transistors 202 corresponding to each of the second sensing signal lines S2 is the same. In this case, referring to fig. 9, fig. 9 is a distribution diagram of a plurality of second sensing signal lines provided in the embodiment of the present application, a plurality of pixel regions where a plurality of second photo transistors 202 corresponding to one second sensing signal line S2 are located can form one positioning region 202a, and the size of each positioning region 202a is the same. For example, the plurality of pixel regions in each positioning region 202a may be arranged in three rows and three columns. Wherein the number of the plurality of second sensing signal lines S2 is the same as the number of the plurality of positioning regions 202a, and each second sensing signal line S2 may be electrically connected to a respective second phototransistor 202 in the positioning region 202 a.

For example, since handwriting when a user writes on the liquid crystal handwriting board 000 by a writing tool is generally wide, the width of the pixel area 101a is generally small. Therefore, in order to improve the accuracy of recognizing the position of the area where the written handwriting exists, one positioning area 202a may be composed of a plurality of pixel areas 101 a. After any one of the pixel regions 101a receives the irradiation of the target light, it can be detected by the corresponding second phototransistor 202, so that the writing pen existing in the region composed of the pixel regions 101a can be erased. In the liquid crystal handwriting board 000, the size of the single positioning area 202a can be adjusted by adjusting the corresponding relationship between the plurality of second sensing lines S2 and the plurality of first photo-transistors 202, so as to adjust and control the size of the minimum erasing area.

Optionally, the second phototransistor 202 in the photosensitive element 200 also has a gate, a first pole, a second pole and an active layer, and for the specific structure of the second phototransistor 202, reference is made to the first phototransistor 201, which is not described herein again.

The photosensitive element 200 in the liquid crystal handwriting pad 000 further includes: a plurality of second photo-sensitive signal lines L2, a second photo-sensitive signal line L2 is electrically connected to the first electrode of each second photo-transistor 202 in a column of pixel regions 101a, and the second photo-sensitive signal line L2 is further electrically connected to the control element 300.

One second sensing signal line S2 is connected in series with the second pole of the corresponding second photo transistors 202, and one second sensing signal line S2 is electrically connected with the current output terminal 2021 of the second photo transistors 202.

The photosensitive element 200 also includes: a plurality of second gate lines G2, one second gate line G2 is electrically connected to the gate of each first phototransistor 201 in a row of pixel regions 101a, and the second gate line G2 is also electrically connected to the control element 300.

In the embodiment of the present application, when the writing handwriting presented on the liquid crystal writing pad 000 needs to be erased, the second phototransistor 202 in the liquid crystal writing pad 000 needs to be in an operating state. In this case, the control assembly 300 may apply a gate voltage to the second gate line G2 and a data voltage to the second light-sensitive signal line L2. Under irradiation of the target light, the number of hole-electron pairs in the active layer of the second phototransistor 202 increases, so that the first and second poles of the second phototransistor 202 are turned on, and the second photo-sensitive signal line L2 can apply the data voltage to the second sensing signal line S2 through the first and second poles of the second phototransistor 202. Thus, the control element 300 can determine that the target light irradiates the pixel area to be erased corresponding to the second phototransistor 202 by detecting the current level of the electrical signal transmitted by the second sensing signal line S2.

In the embodiment of the present application, please refer to fig. 8 and 10, and fig. 10 is a schematic diagram of a film structure of the array substrate shown in fig. 8 at B-B'. The photosensitive element 200 in the liquid crystal writing pad 000 also includes: a second transfer electrode 202' electrically connected to a second pole of the second phototransistor 202.

The plurality of second photo-transistors 202 corresponding to one second sensing signal line S2 are also arranged in a plurality of rows and columns, and a row of second transfer electrodes 202 'electrically connected to the second poles of a row of second photo-transistors 202 are connected in series by a third connection line 2022, and a column of first transfer electrodes 202' electrically connected to the second poles of a column of second photo-transistors 202 are connected in series by a fourth connection line 2023.

The second plurality of phototransistors 202 also have a current output terminal 2021, wherein the current output terminal 2021 is: one of a plurality of second transfer electrodes 202' electrically connected to a second pole of the plurality of second photo transistors 202. It should be noted that the current output terminals 2021 of the plurality of second phototransistors 202 corresponding to one second sensing signal line S2 refer to: the second photo-transistor 202 is a current sink for the current transmitted by the target light, and for this purpose, the second switching electrode 202 'located at the lower right corner in the second switching electrodes 202' in fig. 8 is a current output end 2021.

In this case, by configuring each second phototransistor 202 with a second via electrode 202 ' electrically connected to the second pole thereof and connecting a row of second via electrodes 202 ' in series through a third connection line 2022 and a column of second via electrodes 202 ' in series through a fourth connection line 2023, it is convenient to connect one second sensing signal line S2 in series with the second poles of the corresponding plurality of second phototransistors 202. In addition, the second sensing signal line S2 can also be electrically connected to the second poles of the corresponding second phototransistors 202 through the second through electrode 202', which simplifies the electrical connection between the second sensing signal line S2 and the second poles of the corresponding second phototransistors 202.

For example, in the array substrate 101, the second through electrode 202 'may be disposed on the same layer and have the same material as the pixel electrode 1011, and the pixel electrode 1011 and the second through electrode 202' may be insulated from each other by the slit d 2; the extending direction of the third connection line 2022 may be parallel to the extending direction of the second gate line G2, such that the second connection line 2022, the second gate line G2 and the gate of the second phototransistor 202 are disposed in the same layer and have the same material; the extending direction of the fourth connection line 2023 may be parallel to the extending direction of the second photo-sensitive signal line L2, such that the fourth connection line 2023, the second photo-sensitive signal line L2 and the first and second electrodes of the second photo-transistor 202 are disposed at the same layer and have the same material.

In the present application, a first insulating layer 1014 exists between the second transfer electrode 202' and the second pole of the second phototransistor 202, and the first insulating layer 1014 has a plurality of third vias V3. Among the plurality of third vias V3, a portion of the third vias V3 is used to connect the second via electrode 202 'and the second pole of the second phototransistor 202, and another portion of the third vias V3 is used to connect the second via electrode 202' and the fourth connecting line 2023.

A gate insulating layer 1013 is present between the active layer and the gate of the second phototransistor 202, and the gate insulating layer 1013 and the first insulating layer 1014 have a fourth via V4 communicating with each other. The fourth via V4 is used to connect the second via electrode 202' and the third connection line 2022.

In the embodiment of the application, when the writing trace on the liquid crystal writing pad 000 needs to be erased, the control component 300 in the liquid crystal writing pad 000 may determine, through the magnitude of the current of the electrical signal transmitted on each second sensing signal line S2, that the target light is irradiated on the pixel area where each second phototransistor 202 is located, and further may determine the position information of the pixel area where the target light is irradiated as the position information of the pixel area to be erased.

In the above two aspects, the extending direction of the first photosensitive signal line L1 is parallel to the extending direction of the second photosensitive signal line L2, and the extending direction of the first gate line G1 is parallel to the extending direction of the second gate line G2. In order to simplify the wiring difficulty, it is necessary to ensure that the extending direction of the first sensing signal line S1 is perpendicular to the extending direction of the second sensing signal line S2. For example, the extending direction of the first sensing signal line S1 may be parallel to the extending direction of the first photosensitive signal line L1, and the extending direction of the second sensing signal line S2 is parallel to the extending direction of the second gate line G2, so that the first sensing signal line S1 and the first photosensitive signal line L1 may be disposed in the same layer and have the same material, and the second sensing signal line S2 and the second gate line G2 are disposed in the same layer and have the same material.

In the present application, please refer to fig. 11 and 12, in which fig. 11 is a top view of another array substrate shown in fig. 4, and fig. 12 is a top view of still another array substrate shown in fig. 4. The array substrate 101 in the liquid crystal handwriting board 000 further includes: and a driving transistor 1016 electrically connected to the pixel electrode 1011. When the photosensitive element 200 includes: the driving transistor 1016, the first phototransistor 201, and the second phototransistor 202 are disposed in the same layer in the case of the first phototransistor 201 and the second phototransistor 202. That is, the driving transistor 1016, the first phototransistor 201, and the second phototransistor 202 are formed at the same time.

In the embodiment, the first electrode of the driving transistor 1016 is electrically connected to the data line D, the second electrode of the driving transistor 1016 is electrically connected to the pixel electrode 1011, and the gate electrode of the driving transistor 1016 is electrically connected to the third gate line G3. In this way, when the liquid crystal writing pad 000 is in the erasing mode, and after the control component 300 senses the position information of the to-be-erased area in the liquid crystal writing pad 000 through each of the second sensing signal lines S2 electrically connected thereto, the control component 300 may apply corresponding electrical signals to the third gate line G3 and the data line D, so that a pixel voltage may be applied to the pixel electrode 1011 in the pixel area to be erased, and a voltage difference may be formed between the pixel electrode 1011 and the common electrode 1021 in the pixel area to be erased, so as to implement the function of erasing the writing displayed on the liquid crystal writing pad 000.

In the embodiment of the application, at least two of the three processes, which are storage processes of the writing corresponding to the liquid crystal handwriting board 000, a positioning process of a pixel area where the writing to be erased is located, and an erasing process of the writing in the pixel area to be erased, are independent processes, and for example, the three processes may be three independent processes. Thus, the first phototransistor 201, the second phototransistor 202, and the drive transistor 1016 need not be operated simultaneously. In this case, at least two of the first to third gate lines G1, G2 and G3 may be multiplexed, and at least two of the first to third gate lines L1, L2 and D may be multiplexed. Thus, the number of signal lines of the array substrate 101 in the liquid crystal handwriting board 000 is effectively reduced.

For example, in one case, as shown in fig. 11, it shows a case where the second photosensitive signal line L2 and the data line D are multiplexed, and the first gate line G1 and the third gate line G3 are multiplexed. In another case, as shown in fig. 12, it shows a case where the first photosensitive signal line L1, the second photosensitive signal line L2, and the data line D are all multiplexed, and the first gate line G1, the second gate line G2, and the third gate line G3 are all multiplexed.

In the embodiment of the present application, as shown in fig. 7 and 10, the array substrate 101 may further include: the first substrate 1012 and the pixel electrode 1011 may be located on a side of the first substrate 1012 facing the flexible substrate 102. The array substrate 101 may further include: and a second insulating layer 1015 on a side of the pixel electrode 1011 remote from the first substrate 1012. In this way, when the array substrate 101 and the flexible substrate 102 are disposed opposite to each other, since the device environment is not a dust-free environment, a foreign object may occur between the array substrate 101 and the flexible substrate 102, and the second insulating layer 1015 may be used to prevent the foreign object located between the array substrate 101 and the flexible substrate 102, thereby preventing the performance of the liquid crystal tablet 000 from being affected by the foreign object located between the array substrate 101 and the flexible substrate 102.

The array substrate 101 may further include: and the black film layer 1017 is positioned on the side of the first substrate 1012 away from the flexible substrate 102. The black film layer 1017 is used to absorb the external light object light passing through the liquid crystal layer 103, so that it presents a black background.

Referring to fig. 13, fig. 13 is a schematic structural diagram of another liquid crystal handwriting board according to the implementation of the present application. The photosensitive element 200 in the liquid crystal handwriting board 000 may be located on a side of the array substrate 101 away from the flexible substrate 102, that is, the photosensitive element 200 faces a side opposite to the display surface of the liquid crystal panel 100.

The photosensitive element 200 may include: a circuit board 203, and a plurality of photosensors 200a located on the circuit board 203. The photosensitive elements 200a in the photosensitive assembly 200 can be electrically connected to the circuit board 203, and the circuit board 203 can be electrically connected to the control assembly 300. The control component 300 can monitor the parameters of the photosensitive elements 200a through the circuit board 203.

In this embodiment of the application, when the writing traces appearing on the liquid crystal panel 100 need to be stored, the control component 300 needs to detect the intensity of the received ambient light through each photosensitive element 200a on the circuit board 203, so that the control component 300 can distinguish the area where the writing traces exist and the area where the writing traces do not exist, and further generate the image information corresponding to the writing traces. When the writing handwriting presented on the liquid crystal panel 100 needs to be erased, the control component 300 needs to determine the position of the target light irradiated on the liquid crystal panel 100 through each photosensitive element 200a on the circuit board 203, and further determine the position information of the pixel region 101a to be erased.

Optionally, each photosensitive element 200a in the photosensitive assembly 200 may be a photo resistor, a photo diode, a photo transistor, or the like.

In this case, the photosensitive element 200 can be attached to the side of the array substrate 101 away from the flexible substrate 102, and it is necessary to ensure that the plurality of photosensitive elements 200a in the photosensitive element 200 face the array substrate 101, so as to ensure that the ambient light passing through the liquid crystal panel 100 can enter the photosensitive elements 200 a. It should be noted that the Circuit Board 203 in the photosensitive assembly 200 may be a Printed Circuit Board (PCB) or a Flexible Circuit Board (FPC).

For example, a Surface Mount Technology (SMT) process may be used to connect the plurality of photosensors 200a in the photosensor assembly 200 to the circuit board 203. For example, a plurality of solder pastes may be printed on the circuit board 203; then, the multiple photosensitive elements 200a are transferred onto the circuit board 203, so that the multiple photosensitive elements 200a and the multiple solder pastes are in one-to-one corresponding contact; then, reflow soldering is performed on the circuit board so that each photosensitive element 200a is electrically connected with the circuit board 203 through corresponding solder paste; finally, the circuit board 203 having the plurality of photosensors 200a is optically inspected using an Automatic Optical Inspection (AOI) system.

In this embodiment, the liquid crystal handwriting board 000 may further include: and a black matrix 400. The black matrix 400 in the liquid crystal writing pad 000 is located between the plurality of pixel electrodes 1011 of the array substrate 101 and the plurality of photosensitive elements 201 of the photosensitive element 200.

As shown in fig. 14, 15 and 16, fig. 14 is a top view of a stacked array substrate, black matrix and photosensitive element according to an embodiment of the present disclosure, fig. 15 is a top view of the black matrix in the structure shown in fig. 14, and fig. 16 is a top view of the photosensitive element in the structure shown in fig. 14. The black matrix 400 in the liquid crystal writing pad 000 has a plurality of light passing holes 401. A plurality of light-passing holes 401 in the black matrix 400 correspond to the plurality of pixel regions 101a of the array substrate 101 one to one, and an orthogonal projection of each light-passing hole 401 on the array substrate 101 is located in the corresponding pixel region 101 a. Since each photosensitive element 201 in the photosensitive element 200 corresponds to at least one pixel region 101a, at least one light-passing hole 401 in the black matrix 400 corresponds to one photosensitive element 201 in the photosensitive element 200, and an orthogonal projection of each light-passing hole 401 on the array substrate 101 and an orthogonal projection of the corresponding photosensitive element 201 on the array substrate 101 are located to at least partially overlap.

In this case, the target light directed to each pixel region 101a of the array substrate 101 in the liquid crystal panel 100 may sequentially pass through the corresponding light passing hole 401 and then be directed to the corresponding photosensitive element 201 in the photosensitive element 200, so as to ensure that the photosensitive element 200 can sense the target light directed to any one pixel region 101a through the plurality of photosensitive elements 201.

Fig. 14 schematically illustrates an example in which the shape of each light transmitting hole 401 in the black matrix 400 is a square. In other possible implementations, the shape of each light passing hole 401 in the black matrix 400 may also be a circle, a rectangle, or another shape, which is not limited in this embodiment of the application.

Optionally, the area of the orthographic projection of the light-passing hole 401 in the black matrix 400 on the array substrate 101 cannot be too small, so as to ensure that the target light can normally pass through the light-passing hole 401 and then enter the photosensitive element 201. The orthographic projection area of the light-transmitting hole 401 in the black matrix 400 on the array substrate 101 cannot be too large, so that when the bistable liquid crystal molecules in the liquid crystal handwriting board 000 present a focal conic texture, external light (ambient light or target light) can pass through the liquid crystal layer 103 and be absorbed by the black matrix 400, and the liquid crystal handwriting board presents a black background. For example, the area of the orthographic projection of the light passing hole 401 in the black matrix 400 on the array substrate 101 accounts for 5% to 20% of the area of the corresponding pixel region 101 a. For example, assuming that the size of the pixel region 101a of the array substrate 101 is 1mm × 1mm (millimeter), and the percentage of the area of the orthogonal projection of the light-passing hole 401 on the array substrate 101 in the present application to the area of the corresponding pixel region 101a is 10%, the size of the light-passing hole 401 in the black matrix 400 is 0.1mm × 0.1 mm.

In the embodiment of the present application, in the target direction, the arrangement direction of any two adjacent light-passing holes 401, of the at least two light-passing holes 401 corresponding to the at least two adjacent pixel regions 101a, intersects with the target direction. For example, the arrangement direction of the two light-passing holes 401 corresponding to any two adjacent pixel regions 101a intersects with the target direction. The target direction is an arrangement direction of a row of pixel regions 101a, and the arrangement direction of the row of pixel regions 101a may be a row arrangement direction of the pixel regions, a column arrangement direction of the pixel regions, or an oblique arrangement direction of the pixel regions. Therefore, the plurality of light through holes 401 in the black matrix 400 can be distributed in a disordered manner, so as to avoid the problem that the light through holes 401 in the black matrix 400 show bright lines after light leakage occurs at the back of the liquid crystal panel 000 when the light through holes are arranged in a row or a column.

Optionally, the plurality of light-passing holes 401 in the black matrix 400 includes at least one light-passing hole group, and the distribution positions of orthographic projections of the light-passing holes 401 in the light-passing hole group on the array substrate 101 in the corresponding pixel regions 101a are different. In this application, when the plurality of light transmission holes 401 in the black matrix 400 are divided into a plurality of light transmission hole groups, the arrangement of the light transmission holes 401 in each light transmission hole group may be the same. For example, 36 light-passing holes 401 corresponding to each 36 pixel regions 101a may form a light-passing hole group, and the 36 pixel regions 101a may be arranged in six rows and six columns. The positions of orthographic projections of the respective light-passing holes 401 in each light-passing hole group on the array substrate 101 within the corresponding pixel regions 101a are different. By dividing the plurality of light passing holes 401 in groups, the manufacturing difficulty of the black matrix 400 can be effectively reduced.

Alternatively, referring to fig. 17 and 18, fig. 17 is a top view of an array substrate in the liquid crystal handwriting board shown in fig. 13, and fig. 18 is a schematic diagram of a film structure of the array substrate shown in fig. 17 at a position C-C'. The array substrate 101 in the liquid crystal panel 100 may include: a first substrate 1012, and a plurality of pixel electrodes 1011 and a plurality of driving transistors 1016 on the first substrate 1012. The plurality of pixel electrodes 1011 and the plurality of driving transistors 1016 in the array substrate 101 are electrically connected in a one-to-one correspondence.

In the embodiment of the present application, there are various positions of the black matrix 400 in the liquid crystal handwriting board 000, and the embodiment of the present application is schematically described by taking as an example an implementation corresponding to the following two cases.

In the first case, as shown in fig. 18, the black matrix 400 in the liquid crystal writing pad 000 is located on the side of the first substrate 1012 in the array substrate 101 facing away from the flexible substrate 102.

In the second case, as shown in fig. 19, fig. 19 is another schematic diagram of the film structure of the array substrate shown in fig. 17 at C-C'. The black matrix 400 in the liquid crystal handwriting board 000 is located on the side of the first substrate 1012 facing the flexible substrate 102 in the array substrate 101. In this case, since the black matrix 400 also has a certain conductive property, the third insulating layer 1018 needs to be provided between the black matrix 400 and the driving transistors 1016 in order to avoid a short circuit phenomenon in the driving transistors 1016 on the first substrate 1012. For example, the third insulating layer 1018 may be a transparent insulating layer, so that the black matrix 400 can be insulated from the driving transistor 1016 without affecting the light of the target emitted to the photosensitive element 200 through the light passing hole 401 in the black matrix 400.

In the embodiment of the present application, the processes for forming the black matrix 400 on the first substrate 1012 in the above two cases may be: a screen printing process or a patterning process.

When the black matrix 400 is formed on the first substrate 1012 by using a screen printing process, a layer of black ink may be printed on the first substrate 1012 by using a screen printing apparatus, and the black matrix 400 may be obtained by drying the black ink.

When the black matrix 400 is formed on the first substrate 1012 by a patterning process, a black thin film may be formed on the first substrate 1012 by any of various methods such as deposition, coating, sputtering, and the like, and then the black thin film may be subjected to an exposure process and a development process to obtain the black matrix 400.

In the embodiment of the present application, the black matrix 400 in the liquid crystal handwriting board 000 can replace the black aluminum honeycomb board in the conventional liquid crystal handwriting board, and the thickness of the black matrix 400 is smaller than that of the black aluminum honeycomb board. Therefore, the liquid crystal handwriting board 000 provided by the embodiment of the application has a smaller thickness and a smaller weight.

It should be noted that the black matrix 400 in the liquid crystal writing pad 000 may be integrated not only in the array substrate 101 but also in the photosensitive element 200. For example, as shown in fig. 20, fig. 20 is a schematic view of a film structure of a photosensitive element according to an embodiment of the present disclosure. The photosensitive assembly 200 may further include: a flat layer 204 on a side of the plurality of photosensitive elements 200a away from the circuit board 203, and the black matrix 400 in the liquid crystal writing pad 000 may be on a side of the flat layer 204 away from the circuit board 203. The planarization layer 204 can be a transparent insulating layer, so that the planarization layer 204 can improve the planarization of the photosensitive element toward the array substrate 101 to ensure the planarization of the black matrix 400, and the black matrix 400 and the photosensitive element 201 can be insulated without affecting the light of the target emitted to the photosensitive element 200 through the light hole 401 in the black matrix 400.

It should be noted that, as shown in fig. 17, the structure and the operation principle of the driving transistor 1016 in the array substrate 101 refer to the first alternative implementation, which is not described in detail in this application.

In the embodiment of the present application, please refer to fig. 21, and fig. 21 is a top view of an ambient light detection assembly on a liquid crystal handwriting board according to the embodiment of the present application. The liquid crystal handwriting board 000 further includes: the ambient light detection assembly 500, the ambient light detection assembly 500 is electrically connected to the control assembly 300. In the present application, the ambient light of the environment where the liquid crystal handwriting pad 000 is located can be detected through the ambient light detecting component 500, so that the control component 300 can distinguish the area where the handwriting is written and the area where the handwriting is not written under different environments, and then can generate the image information corresponding to the handwriting under different environments.

For example, the number of the ambient light detection assemblies 500 in the liquid crystal handwriting board 000 may be multiple, and the detection accuracy of the ambient light of the environment where the liquid crystal handwriting board 000 is located may be improved by the multiple ambient light detection assemblies 500. It should be noted that the plurality of ambient light detection assemblies 500 may be distributed in the display area of the liquid crystal handwriting board 000, or may be distributed in the non-display area at the periphery of the display area of the liquid crystal handwriting board 000. Moreover, the plurality of ambient light detecting elements 500 may be uniformly distributed around the liquid crystal writing pad 000.

In the present application, the control assembly 300 is further configured to: the first light intensity after the ambient light penetrates through the first test area Q1 in the liquid crystal panel 100 is detected by the ambient light detection assembly 500 to determine a first preset light intensity range, and/or the second light intensity after the ambient light penetrates through the second test area Q2 in the liquid crystal panel 100 is detected by the ambient light detection assembly 500 to determine a second preset light intensity range, wherein the first test area Q1 is an area corresponding to the written handwriting presented in the liquid crystal panel 100, and the second test area Q2 is an area corresponding to the written handwriting not presented in the liquid crystal panel 100.

For example, when a plurality of ambient light detection assemblies 500 are distributed within the display area of liquid crystal handwriting pad 000, first test area Q1 may be an area of bistable liquid crystal molecules in liquid crystal handwriting pad 000 that exhibit a planar texture. Second test area Q2 may be an area of bistable liquid crystal molecules in liquid crystal handwriting pad 000 where the bistable liquid crystal molecules exhibit a focal conic texture. In other possible implementations, the bistable liquid crystal molecules in the first test area Q1 and the second test area Q2 may be in a focal conic texture, but an optical filter capable of filtering light with a specific wavelength (for example, the wavelength of green light) in the ambient light is added to the first test area Q1, so that the process of transmitting the ambient light from the liquid crystal layer with the optical filter is equivalent to the process of transmitting the ambient light from the area of the bistable liquid crystal molecules in the liquid crystal layer with a planar texture. It should be noted that, when a plurality of ambient light detection assemblies 500 may be distributed in the display area of the liquid crystal writing pad 000, the pixel electrodes cannot be disposed in the first test area Q1 and the second test area Q2.

When the plurality of ambient light detection assemblies 500 are distributed in the non-display area of the liquid crystal handwriting board 000, the first test area Q1 and the second test area Q2 do not have a liquid crystal layer, a filter capable of filtering light with a specified wavelength (for example, the wavelength of the green light) in the ambient light may be disposed in the first test area Q1, and a filter may not be disposed in the second test area Q2. Thus, the intensity of the ambient light after being emitted to the first test area Q1 is equivalent to the intensity of the ambient light after being emitted from the area of the bistable liquid crystal molecules in the liquid crystal layer, which have a planar texture; the intensity of the ambient light after it strikes the second test area Q2 is equivalent to the intensity of the ambient light after it emerges from the liquid crystal layer as a region of bi-stable liquid crystal molecules in a focal conic texture.

In the present application, the ambient light detecting assembly 500 may be integrated into the liquid crystal panel 100, or may be located outside the liquid crystal panel 100. The embodiments of the present application take the following two exemplary implementations as examples:

in the first exemplary implementation manner, when the ambient light detection assembly 500 is integrated in the liquid crystal panel 100, the photosensitive assembly 200 in the liquid crystal writing pad may also be integrated in the liquid crystal panel 100, that is, the structure of the photosensitive assembly 200 is the structure in the first optional implementation manner described above. Referring to fig. 22, fig. 22 is a schematic structural diagram of an ambient light detection assembly according to an embodiment of the present disclosure. The ambient light detection assembly 500 includes: a plurality of first test transistors 501 in series located within a first test region Q1, and a plurality of second test transistors 502 in series located within a second test region Q2.

In this embodiment, after the ambient light irradiates the first test area Q1 of the liquid crystal writing pad 000, the plurality of first test transistors 501 connected in series in the first test area Q1 all generate a current signal, the control component 300 may obtain the current generated after the single first test transistor 501 is irradiated by the ambient light according to the total current generated by the plurality of first test transistors 501 connected in series and the number of the plurality of first test transistors 501 connected in series, and obtain the first light intensity when the ambient light irradiates the first test area Q1 by combining the corresponding relationship between the current magnitude and the light intensity. Similarly, a second intensity of ambient light impinging on the second test area Q2 may also be obtained. The control module 300 may then determine a first predetermined light intensity range in the above embodiment based on the first light intensity, and determine a second predetermined light intensity range in the above embodiment based on the second light intensity. It should be noted that the first light intensity may be within a first predetermined light intensity range, for example, the first light intensity may be a light intensity corresponding to a median value within the first predetermined light intensity range.

Optionally, the plurality of first test transistors 501 and the plurality of second test transistors 502 correspond to each other one by one, a gate of one first test transistor 501 is electrically connected to a gate of the corresponding second test transistor 502 through one test gate line C, first poles of the plurality of first test transistors 501 are connected in series through a first test signal line C1, second poles of the plurality of first test transistors 501 are connected in series through a second test signal line C2, first poles of the plurality of second test transistors 502 are connected in series through a third test signal line C3, and second poles of the plurality of first test transistors 502 are connected in series through a fourth test signal line C4. Here, the control assembly 300 may be electrically connected to the test gate line C, the first test signal line C1, the second test signal line C2, the third test signal line C3, and the fourth test signal line C4, respectively.

For example, when the ambient light detecting assembly 500 is in an operating state, the control assembly 300 needs to simultaneously load corresponding electrical signals to the test gate line C, the first test signal line C1 and the third test signal line C3, and respectively determine the first preset light intensity range and the second preset light intensity range through the currents of the electrical signals transmitted through the second test signal line C2 and the fourth test signal line C4.

In the second exemplary implementation manner, when the ambient light detection assembly 500 is located on the side of the array substrate 201 away from the flexible substrate 202, the photosensitive assembly 200 in the liquid crystal handwriting board may also be located on the side of the array substrate 201 away from the flexible substrate 202, that is, the structure of the photosensitive assembly 200 is the structure in the second optional implementation manner. In this case, the ambient light detecting assembly 500 and the photosensitive assembly 200 may be integrated into one assembly, that is, the photosensitive elements for detecting ambient light may be separately disposed on the circuit board 203, and the photosensitive elements for detecting ambient light need to be distributed around the plurality of photosensitive elements 200a arranged in an array.

Optionally, the flexible substrate 102 in the liquid crystal panel 100 includes: a second substrate 1022, and a common electrode 1021 on the second substrate 1022 in the flexible substrate 102. A constant common voltage (e.g., 0 v) may be applied to the common electrode 1021, so that a voltage difference can be ensured between the pixel electrode 1011 and the common electrode. The second substrate 1022 may be a flexible substrate, and the material of the second substrate 1022 may include: polyethylene Terephthalate (abbreviated as PET).

In the embodiment of the present application, the materials of the pixel electrode 1011 in the array substrate 101 and the common electrode 1021 in the flexible substrate 102 may include: indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO), and the like. Thus, it is ensured that the target light can pass through the liquid crystal panel 100 and then be emitted to the photosensitive element 200.

Optionally, in order to ensure that the power consumption of the liquid crystal handwriting board 000 is low, a control switch and a switch may be disposed in the liquid crystal handwriting board 000. The control switch and the switch can be electrically connected to the control component 300, the control switch is used for storing the handwriting displayed on the liquid crystal handwriting board 000, and the switch is used for controlling the liquid crystal handwriting board 000 to switch between the erasing mode and the writing mode.

When the liquid crystal handwriting board 000 is in a writing mode, the control component 300 and the photosensitive component 200 are both in a non-working state, and at this time, the liquid crystal handwriting board 000 does not need to supply power to the control component 300 and the photosensitive component 200; when the liquid crystal handwriting board 000 is in the erasing mode, the control component 300 and the photosensitive component 200 are both in the working state, and at this time, the liquid crystal handwriting board 000 needs to supply power to the control component 300 and the photosensitive component 200. Therefore, only when the liquid crystal handwriting board 000 is in the erasing mode, the liquid crystal handwriting board 000 needs to consume electric energy, and the power consumption of the liquid crystal handwriting board 000 is effectively reduced.

In the process that the user writes through liquid crystal handwriting board 000, when the writing that appears on liquid crystal panel 000 is required to be preserved, the user can trigger control switch to let control switch send corresponding instruction to control assembly 300, make can generate the image information that corresponds with the writing under control assembly 300 and photosensitive assembly 200's the mating reaction.

The embodiment of the application also provides a control method of the liquid crystal handwriting board, which is applied to the liquid crystal handwriting panel in the embodiment. The liquid crystal handwriting panel is exemplified by the liquid crystal handwriting panel shown in fig. 3, 4 or 13. The control method of the liquid crystal handwriting board can comprise the following steps: detecting the light intensity of the ambient light irradiating each pixel area through a photosensitive assembly; and generating image information corresponding to the handwriting based on the light intensity of the ambient light irradiating each pixel area.

Optionally, the method for controlling the liquid crystal handwriting board further includes: the position information of the target light irradiated on the liquid crystal panel is detected through the photosensitive assembly so as to determine the position information of the pixel area to be erased, and pixel voltage is applied to the pixel electrode in the pixel area to be erased, so that a voltage difference is formed between the pixel electrode and the common electrode in the pixel area to be erased.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working principle of the control method of the liquid crystal handwriting board described above may refer to the corresponding part in the structural embodiment of the liquid crystal handwriting panel, and is not described herein again.

It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may also be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or there can be more than one intermediate layer or element. Like reference numerals refer to like elements throughout.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.

Claims

1. A liquid crystal writing pad, comprising: the liquid crystal display device comprises a liquid crystal panel, a photosensitive assembly and a control assembly;

2. The liquid crystal writing pad of claim 1, wherein the photosensitive component is integrated within the liquid crystal panel, the photosensitive element comprising: the first photosensitive transistors correspond to the pixel regions one by one, and are positioned in the corresponding pixel regions;

3. The liquid crystal writing pad of claim 2, wherein the photosensitive assembly further comprises: a plurality of first photosensitive signal lines, one of which is electrically connected to the first electrode of each first photosensitive transistor in a row of the pixel regions, and the first photosensitive signal line is further electrically connected to the control component;

4. The liquid crystal writing pad of claim 3, wherein the photosensitive assembly further comprises: a first transfer electrode electrically connected to the second pole of the first phototransistor;

5. The liquid crystal handwriting board according to claim 4, wherein the first connecting line and the gate of the first phototransistor are arranged in the same layer and are made of the same material;

6. The liquid crystal writing pad of any one of claims 1 to 5, wherein the liquid crystal layer comprises: a layer of bistable liquid crystal molecules;

the bistable liquid crystal molecules in the bistable liquid crystal molecule layer are configured to: after the liquid crystal panel is subjected to external pressure, the focal conic texture is converted into a plane texture; under the action of voltage difference, the pixel area to be erased in the liquid crystal handwriting board is changed from a plane texture into a focal conic texture.

7. The liquid crystal writing pad of any one of claims 1 to 5, further comprising: the environment light detection assembly is electrically connected with the control assembly;

8. The liquid crystal writing pad of claim 7, wherein the ambient light detection assembly is integrated within the liquid crystal panel, the ambient light detection assembly comprising: a plurality of first test transistors in series within the first test area, and a plurality of second test transistors in series within the second test area.

9. The liquid crystal writing pad of claim 8, wherein a plurality of the first test transistors and a plurality of the second test transistors are in one-to-one correspondence;

10. The liquid crystal handwriting pad of claim 9, wherein said liquid crystal layer comprises a layer of bistable liquid crystal molecules, said first test transistor and said second test transistor are integrated within said array substrate, bistable liquid crystal molecules within said first test zone are in a planar texture, bistable liquid crystal molecules within said second test zone are in a focal conic texture.

11. The liquid crystal writing pad of claim 10, wherein the array substrate comprises: a pixel electrode located in the pixel region, the flexible substrate including: a common electrode;

12. The liquid crystal writing pad of claim 11, wherein the photosensitive component is integrated within the liquid crystal panel, the photosensitive element comprising: the second photosensitive transistors correspond to the pixel regions one by one, and are positioned in the corresponding pixel regions;

13. The liquid crystal writing pad of claim 12, wherein the array substrate further comprises: a driving transistor electrically connected to the pixel electrode, when the photosensitive element includes: and when the first photosensitive transistor and the second photosensitive transistor are used, the driving transistor, the first photosensitive transistor and the second photosensitive transistor are arranged in the same layer.

14. The liquid crystal writing pad of claim 1, wherein the photosensitive element is located on a side of the array substrate facing away from the flexible substrate;

15. A method for controlling a liquid crystal writing pad, which is applied to the liquid crystal writing pad of any one of claims 1 to 14, the method comprising:

16. The method of claim 15, wherein the liquid crystal panel comprises: array substrate and flexible substrate that relative setting, the array substrate includes: a pixel electrode located in the pixel region, the flexible substrate including: a common electrode; the method further comprises the following steps: