Writing board, method for driving the same, and writing device

Abstract

A writing board, a driving method of the writing board and a writing device, the writing board comprising a first substrate, a second substrate, a bistable liquid crystal layer, a photosensitive device and a processing module, the first substrate and the second substrate are oppositely arranged, the second substrate is used for receiving a writing pressure and displaying a writing trace; the bistable liquid crystal layer is arranged between the first substrate and the second substrate and is used for state transformation; the photosensitive device is used for receiving light rays from the second substrate and outputting an electrical signal; the processing module is electrically connected with the photosensitive device, the processing module is used for receiving and recording the electrical signal, and the state transformation of the bistable liquid crystal layer is controlled to restore the writing trace. In the application, the writing trace of the writing board can be saved or reset, the problem that the writing trace of the writing board cannot be restored can be solved, the practicability of the writing board is improved, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of writing devices, in particular to a writing board, a driving method of the writing board and a writing device. BACKGROUND

[0002] The writing board is a product that can meet the writing requirements of users, and has the advantages of portability, clear display of writing traces and repeated writing.

[0003] The existing writing board mainly uses a bistable liquid crystal layer to realize the effect of displaying writing traces, but the writing traces of the writing board are displayed only once and cannot be restored after being erased. SUMMARY

[0004] The purpose of the present application is to provide a writing board, a driving method of the writing board and a writing device, and to solve the problem that the writing traces of the writing board cannot be restored.

[0005] To achieve the purpose of the present application, the present application provides the following technical solutions:

[0006] In a first aspect, the present application provides a writing board, comprising a first substrate, a second substrate, a bistable liquid crystal layer, a photosensitive device and a processing module, the second substrate is arranged opposite to the first substrate, and the second substrate is used for receiving a writing pressure and displaying writing traces; the bistable liquid crystal layer is arranged between the first substrate and the second substrate; the photosensitive device is used for receiving light rays that are incident from the second substrate and pass through the bistable liquid crystal layer, and outputting an electrical signal; the processing module is electrically connected with the photosensitive device, and the processing module is used for receiving and recording the electrical signal and controlling state transformation of the bistable liquid crystal layer to restore the writing traces.

[0007] In an embodiment, the processing module is further used for outputting the electrical signal, and the electrical signal controls the state transformation of the bistable liquid crystal layer to restore the writing traces, or the processing module is further used for converting the electrical signal into a control signal and outputting the control signal, and the control signal is used for controlling the state transformation of the bistable liquid crystal layer to restore the writing traces.

[0008] In an embodiment, the writing board comprises a driving circuit and a plurality of pixels arranged in an array, and the plurality of pixels are used for displaying the writing traces; the driving circuit is electrically connected with the processing module and the plurality of pixels, the signal output by the processing module is output to the driving circuit, and the driving circuit is used for driving the state transformation of the bistable liquid crystal layer.

[0009] In one embodiment, the first substrate comprises a plurality of scan lines and a plurality of data lines, the plurality of scan lines extend along a first direction, the plurality of data lines extend along a second direction, the first direction intersects the second direction, each of the pixels is connected with one of the scan lines and one of the data lines, the pixel comprises a pixel electrode and a thin film transistor disposed in the first substrate, a gate of the thin film transistor is electrically connected with the scan line, a source of the thin film transistor is electrically connected with the data line, and a drain of the thin film transistor is electrically connected with the pixel electrode; the second substrate comprises a common electrode, and the driving circuit is configured to provide a voltage difference between the pixel electrode and the common electrode.

[0010] In one embodiment, the first substrate comprises a first substrate, an insulating layer and a light shielding layer disposed in sequence, the light shielding layer is disposed on a side of the insulating layer away from the first substrate, and a surface of the first substrate away from the insulating layer faces the second substrate, and the photosensitive device is disposed in the insulating layer.

[0011] In one embodiment, the second substrate and the first substrate are opposite in a third direction, and in an orthographic projection in the third direction, at least part of the photosensitive device is located outside the thin film transistor, and the third direction intersects both the first direction and the second direction.

[0012] In one embodiment, the second substrate comprises a second substrate, a light shielding member and an insulating layer disposed in sequence, at least part of the insulating layer is disposed on a side of the light shielding member away from the second substrate, and a surface of the insulating layer away from the second substrate faces the first substrate, and the photosensitive device is disposed in the insulating layer.

[0013] In one embodiment, the second substrate and the first substrate are opposite in a third direction, and in an orthographic projection in the third direction, the light shielding member shields at least part of the thin film transistor, and the third direction intersects both the first direction and the second direction.

[0014] In one embodiment, the writing board comprises two writing boards, the first substrates of the two writing boards are opposite and connected, the writing board comprises a connector, the connector is electrically connected with the processing module, and the connectors of the two writing boards are electrically connected.

[0015] In a second aspect, the present application further provides a driving method of a writing board, applied to the writing board of any one of the first aspect, the driving method of the writing board comprising:

[0016] The second substrate is provided with a writing pressure to display a writing trace, the photosensitive device receives light from the second substrate and passing through the bistable liquid crystal layer, and outputs an electric signal to the processing module, and the processing module receives and records the electric signal;

[0017] The driving circuit provides a first voltage difference to the bistable liquid crystal layer, so that the state of the bistable liquid crystal layer subjected to the writing pressure is changed to the state before the writing pressure is applied, to erase the writing trace.

[0018] The processing module outputs the electric signal as a control signal, and the driving circuit provides a second voltage difference to the bistable liquid crystal layer according to the control signal, to control the state change of the bistable liquid crystal layer to restore the writing trace.

[0019] In a third aspect, the application further provides a writing device, comprising a housing and the writing board according to any one of the first aspect.

[0020] By providing the bistable liquid crystal layer, the photosensitive device and the processing module, when the writing board is subjected to the writing pressure, the state of the bistable liquid crystal layer subjected to the writing pressure is changed, and the light is reflected to display the writing trace on the writing board. At this time, the photosensitive device receives the light scattered or reflected by the bistable liquid crystal layer and outputs an electric signal, and the processing module receives and records the electric signal to memorize the writing trace on the writing board. When the writing trace needs to be restored, the bistable liquid crystal layer changes its state according to the control signal output by the processing module based on the recorded electric signal, to restore the writing trace. The problem that the writing trace on the writing board cannot be restored or stored is solved, and the practicability of the writing board is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0022] Figure 1 is a schematic view of a writing device of an embodiment;

[0023] Figure 2 is a cross-sectional view of a writing state of a writing board of an embodiment;

[0024] Figure 3 is a cross-sectional view of a non-writing state of a writing board of an embodiment;

[0025] Figure 4 is a top view of part of a first substrate of another embodiment;

[0026] Figure 5 is a side sectional view of a non-writing state of a writing board of another embodiment;

[0027] Figure 6 is a side sectional view of a writing state of a writing board of another embodiment;

[0028] Figure 7 is a schematic view of a writing device of another embodiment;

[0029] Figure 8 is a flow chart of a driving method of a writing board;

[0030] Figure 9 is a partial structural schematic view of a writing board of an embodiment.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 100 - writing device;

[0033] 10 - writing board, 11 - second substrate, 111 - common electrode, 112 - second substrate, 113 - light shielding member, 12 - first substrate, 121 - first substrate, 122 - scan line, 123 - data line, 124 - pixel electrode, 125 - thin film transistor, 1251 - gate, 1252 - source, 1253 - drain, 126 - gate insulating layer, 127 - source insulating layer, 128 - light shielding layer, 13 - bistable liquid crystal layer, 14 - photosensitive device, 141 - photosensitive scan line, 142 - photosensitive data line, 143 - first insulating layer, 144 - second insulating layer, 15 - pixel, 16 - connector, 17 - processing module, 18 - driving circuit;

[0034] X - first direction, Y - second direction, Z - third direction. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or there can be an intervening component. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be an intervening component.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of the terms "and / or" includes a combination of one or more of the associated listed items, in any of their possible permutations.

[0038] Some embodiments of the present application will now be described in detail in connection with the accompanying drawings. The following embodiments and features are not mutually exclusive and can be combined with each other.

[0039] Please refer to Figure 1 The writing device 100 provided by the embodiments of the present application comprises a shell (not shown in the figure) and the writing board 10 in the embodiments of the present application, and the writing board 10 is accommodated in the shell.

[0040] Optionally, the writing device 100 can be a children's drawing board, an office whiteboard, a drawing board, a display terminal, a mobile terminal, etc., and the specific type is not limited. The writing on the writing board 10 can be written by a handwriting device, or can be directly written by a finger, and the specific type is not limited.

[0041] Optionally, the connection mode of the shell and the writing board 10 can be adhesion, clamping, screwing, magnetic attraction, etc., and the specific type is not limited. The shape of the writing board 10 can be square, circular, rectangular, trapezoidal, irregular, etc., and the shape of the shell corresponds to the writing board 10, and the specific type is not limited.

[0042] The writing device 100 in the embodiments of the present application, by adopting the writing board 10 in the embodiments of the present application, the writing on the writing board 10 can be saved or restored, solving the problem that the writing on the writing board 10 cannot be restored, improving the practicability of the writing board 10, and improving the user experience.

[0043] The writing board 10 in the embodiments of the present application will be described in detail below.

[0044] First, define the direction. Please refer to Figure 2 The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0045] Please refer to Figure 2 and Figure 9The embodiment of the present application provides a writing board 10, which comprises a second substrate 11, a first substrate 12, a bistable liquid crystal layer 13, a photosensitive device 14 and a processing module 17. The second substrate 11 is used for receiving writing pressure and displaying writing traces. The first substrate 12 is arranged opposite to the second substrate 11. The bistable liquid crystal layer 13 is arranged between the second substrate 11 and the first substrate 12 and is used for transmitting light, for example, reflecting or refracting light incident on the second substrate 11.

[0046] Optionally, the second substrate 11 and the first substrate 12 are opposite in the third direction Z. The second substrate 11 and the first substrate 12 both comprise a transparent substrate commonly used in the field, which can be a transparent plastic substrate or a transparent insulating substrate, and the specific limitation is not made. In an embodiment, the transparent substrate is a polymethyl methacrylate (PMMA) plate. It can be understood that the thickness of the transparent substrate can be set according to requirements, and the embodiment of the present application does not make additional limitations. The first substrate 12 can be an array substrate commonly used in the field, and the specific limitation is not made.

[0047] Optionally, the second substrate 11, the first substrate 12 and the bistable liquid crystal layer 13 can be square, circular, rectangular, trapezoidal, irregular or the like, and the sizes of the three can be completely same or slightly different, and the specific limitation is not made. In an embodiment, the shapes and sizes of the second substrate 11, the first substrate 12 and the bistable liquid crystal layer 13 are all set to be same, which is beneficial to stack the writing board 10 as a regular shape.

[0048] The bistable liquid crystal has been widely used in the writing board 10. The bistable liquid crystal has two texture states of reflection state (Planar Texture, P state) and scattering state (Focal Conic Texture, FC state), and the two texture states can be converted to each other under the action of a certain electric field, and can be maintained in one of the texture states without voltage maintenance. Therefore, the bistable liquid crystal writing board 10 can greatly save power. When the bistable liquid crystal is in the reflection state, the bistable liquid crystal can reflect a certain waveband of visible light to make the display panel display color.

[0049] In the natural state, i.e. the unpowered state, the liquid crystal molecules are in the scattering state, and can transmit the ambient light, so that the area not subjected to the pressure can present the same color as the first substrate 12, which can be used as the background color of the writing board 10; in the state subjected to the pressure, the liquid crystal molecules at the position subjected to the pressure are converted from the scattering state to the reflecting state under the action of the external pressure, and the liquid crystal molecules in the reflecting state can reflect the light of certain wavelength in the ambient light, i.e. the position subjected to the pressure presents the writing content, which can also be understood as the handwriting; in the state subjected to the corresponding control of the control signal, the liquid crystal molecules at the erasing position are converted from the reflecting state to the scattering state, and present the same color as the first substrate 12 again, i.e. the background color, thus having the erasing effect.

[0050] Optionally, the photosensitive device 14 is a photosensitive sensor commonly used in the art, such as a photosensitive diode, a photosensitive triode, etc., and the specific type is not limited. Referring to Figure 9 The photosensitive device 14 is used to receive the light from the second substrate 11 and passing through the bistable liquid crystal layer 13 and output an electric signal, and the processing module 17 is electrically connected with the photosensitive device 14, and the processing module 17 is used to receive and record the electric signal, and the driving module (such as a driving circuit, etc.) of the writing board controls the state transformation of the bistable liquid crystal layer 13 according to the signal of the processing module to restore the handwriting.

[0051] Optionally, the photosensitive device 14 is arranged in the second substrate 11, or the photosensitive device 14 is arranged in the first substrate 12, or the photosensitive device 14 is arranged in the bistable liquid crystal layer 13, and the above modes are all possible. The processing module 17 and the photosensitive device 14 can be integrated or separately arranged, and the processing module 17 and the photosensitive device 14 are electrically connected, and the specific type is not limited.

[0052] When the writing board 10 is subjected to the pressure, the photosensitive device 14 receives the light scattered or reflected from the second substrate 11 and passing through the bistable liquid crystal layer 13, and outputs the light signals at the position subjected to the pressure and the position not subjected to the pressure as different electric signals, and the processing module 17 receives the electric signals and records them. When it is necessary to restore the handwriting, the processing module 17 outputs the recorded signals, and the driving circuit controls the state transformation of the bistable liquid crystal layer 13 according to the output signals to restore the handwriting.

[0053] Optionally, the processing module 17 directly outputs the recorded electric signals, and the electric signals control the state transformation of the bistable liquid crystal layer 13 to restore the handwriting; or the processing module 17 is also used to convert the electric signals into control signals and output them, and the control signals are used to control the state transformation of the bistable liquid crystal layer 13 to restore the handwriting, and the above modes are all possible, and the specific type is not limited.

[0054] The writing board 10 in the embodiment of the application, by setting the bistable liquid crystal layer 13, the photosensitive device 14 and the processing module 17, when the writing board 10 is subjected to the writing pressure, the bistable liquid crystal layer 13 at the position subjected to the writing pressure changes state, and the reflected light makes the writing board 10 display the writing at the position subjected to the writing pressure. At this time, the photosensitive device 14 receives the light scattered or reflected by the bistable liquid crystal layer 13 and outputs the electrical signal, and the processing module 17 receives the electrical signal and stores it to memorize the writing on the writing board 10. When the writing needs to be restored, the bistable liquid crystal layer 13 changes state according to the signal output by the processing module 17 from the stored electrical signal, and the writing is restored, which can solve the problem that the writing on the writing board 10 cannot be restored or stored, and improve the practicability of the writing board 10.

[0055] Optionally, as shown in Figure 1 and Figure 9 The writing board 10 includes the driving circuit 18 and the plurality of pixels 15 arranged in an array, the plurality of pixels 15 are used to display the writing, the driving circuit 18 is electrically connected with the processing module 17 and the plurality of pixels 15, the signal output by the processing module 17 is output to the driving circuit 18, and the driving circuit 18 is used to drive the bistable liquid crystal layer 13 to change state.

[0056] Optionally, the plurality of pixels 15 arranged in an array can be an integrated structure or a split structure, and the plurality of pixels 15 are connected with each other, and the specific connection is not limited.

[0057] Optionally, each pixel 15 includes the second substrate 11, the first substrate 12, the bistable liquid crystal layer 13, the photosensitive device 14 and the processing module 17, the second substrate 11, the first substrate 12 and the bistable liquid crystal layer 13 of the plurality of pixels 15 jointly form the second substrate 11, the first substrate 12 and the bistable liquid crystal layer 13 of the writing board 10. The photosensitive device 14 is a plurality of, and each pixel 15 is provided with one photosensitive device 14, and the specific position is not limited. The processing module 17 can be one or a plurality of, when the processing module 17 is one, the photosensitive device 14 of each pixel 15 is electrically connected with the processing module 17; when the processing module 17 is a plurality of, each pixel 15 is provided with the processing module 17, the photosensitive device 14 of each pixel 15 is electrically connected with the processing module 17, and the specific connection is not limited.

[0058] In an embodiment, the processing module 17 converts the electrical signal into a control signal and outputs, the processing module 17 includes a storage unit and a processing unit. The storage unit is used to store the electrical signal, and the processing unit is used to extract the electrical signal from the storage unit, process and output as a control signal and output to the driving circuit 18.

[0059] Optionally, the driving circuit 18 is arranged on the second substrate 11 or the first substrate 12, which is not limited. The storage unit of the processing module 17 is configured to receive and store the electrical signal output by the photosensitive device 14, and the processing unit of the processing module 17 is configured to convert the electrical signal into a control signal and output the control signal to the driving circuit 18. The driving circuit 18 is electrically connected to the processing module 17 to receive the control signal, and the driving circuit 18 is electrically connected to the plurality of pixels 15, so that the state of the bistable liquid crystal layer 13 in each pixel 15 can be transformed according to the control signal to achieve erasing or restoring of the writing.

[0060] By arranging the writing board 10 to include the driving circuit 18 and the plurality of pixels 15 arranged in an array, the storage unit of the processing module 17 is configured to store the electrical signal, the processing unit of the processing module 17 is configured to convert the electrical signal into a control signal and output the control signal to the driving circuit 18, and the driving circuit 18 is configured to transform the state of the bistable liquid crystal layer 13 in each pixel 15, so that the writing can be restored, and the bistable liquid crystal layer 13 in each pixel 15 can be precisely driven.

[0061] Optionally, as shown in Figure 2 、 Figure 3 and Figure 4 , the first substrate 12 includes a plurality of scan lines 122 and a plurality of data lines 123, the plurality of scan lines 122 extend along the first direction X, and the plurality of data lines 123 extend along the second direction Y. Each pixel 15 is connected to one scan line 122 and one data line 123. The pixel 15 includes a pixel electrode 124 arranged in the first substrate 12, the second substrate 11 includes a common electrode 111, and the driving circuit 18 is configured to provide a voltage difference between the pixel electrode 124 and the common electrode 111.

[0062] Optionally, the pixel 15 is defined between two adjacent scan lines 122 and two adjacent data lines 123.

[0063] Optionally, the first substrate 12 includes a plurality of scan lines 122 and a plurality of data lines 123, the plurality of scan lines 122 are parallel to each other and arranged at equal distances, and the plurality of data lines 123 are parallel to each other and arranged at equal distances. In the orthogonal projection along the third direction Z, the plurality of scan lines 122 and the plurality of data lines 123 are vertically staggered, and each adjacent two scan lines 122 and two data lines 123 form a pixel 15. The plurality of scan lines 122 and the plurality of data lines 123 form a plurality of pixels 15, and the plurality of pixels 15 collectively constitute an effective display area of the writing board 10.

[0064] Optionally, the first substrate 12 of each pixel 15 is provided with a pixel electrode 124 and a thin film transistor 125, the gate 1251 of the thin film transistor 125 is electrically connected with the scan line 122, the source 1252 of the thin film transistor 125 is electrically connected with the data line 123, and the drain 1253 of the thin film transistor 125 is electrically connected with the pixel electrode 124.

[0065] Optionally, as shown in Figure 3 The first substrate 12 includes a first substrate 121, and the first substrate 12 further includes a gate insulating layer 126 and a source insulating layer 127 arranged on the first substrate 121 in sequence. The first substrate 121 is a main support structure, a plurality of scan lines 122 are distributed on the first substrate 121 at equal intervals along a first direction X, the gate insulating layer 126 covers the scan lines 122, a plurality of data lines 123 are distributed above the gate insulating layer 126 along a second direction Y, the data lines 123 are covered with the source insulating layer 127, the pixel electrode 124 is arranged above the source insulating layer 127, and the thin film transistor 125 is located in each pixel 15 and used for controlling the display of each pixel 15.

[0066] Optionally, the scan line 122 is used for controlling the signal flow of the source 1252 to the drain 1253 and the pixel electrode 124, the data line 123 is used for inputting the signal to the pixel electrode 124 through the driving chip, the gate insulating layer 126 is used for insulating the scan line 122 from the data line 123, and the source insulating layer 127 is used for protecting the thin film transistor 125.

[0067] Optionally, the pixel electrode 124 and the common electrode 111 can both be transparent electrodes commonly used in the field, which can be ITO (indium tin oxide) electrodes, AZO (aluminum-doped zinc oxide) electrodes, etc., without specific limitation.

[0068] By arranging a plurality of pixels 15 between the plurality of scan lines 122 and the plurality of data lines 123 in the first substrate 12, arranging the pixel electrode 124 in the pixel 15, and providing the driving circuit 18 for providing a voltage difference between the pixel electrode 124 and the common electrode 111 of each pixel 15, the state transformation of the bistable liquid crystal layer 13 can be driven, and the erasing and restoring of the writing can be realized.

[0069] Optionally, as shown in Figure 5 The first substrate 12 further includes the first substrate 121, an insulating layer, and a light shielding layer 128 arranged in sequence, the light shielding layer 128 is arranged on the side of the insulating layer away from the first substrate 121, and the surface of the first substrate 121 away from the insulating layer faces the second substrate 11, and the photosensitive device 14 is arranged in the insulating layer.

[0070] Optionally, in one embodiment, as shown in Figure 5As shown, the photosensitive device 14 is arranged in the first substrate 12, and is arranged on the side of the first substrate 121 away from the thin film transistor 125 and the pixel electrode 124, so as to avoid the photosensitive device 14 occupying the area of the first substrate 121 facing the first substrate 12, and affecting the light-emitting area of the pixel 15. At the same time, since the thin film transistor 125 is a light-proof device, in the orthographic projection in the third direction Z, at least part of the photosensitive device 14 is exposed to the thin film transistor 125, so as to facilitate receiving the light from the second substrate 11 and passing through the bistable liquid crystal layer 13.

[0071] Optionally, as shown in the figure, Figure 4 As shown, the first substrate 12 further includes a plurality of photosensitive scanning lines 141 and a plurality of photosensitive data lines 142, the plurality of photosensitive scanning lines 141 and the plurality of photosensitive data lines 142 are arranged on the side of the first substrate 121 away from the first substrate 12, the plurality of photosensitive scanning lines 141 are arranged in a similar manner to the scanning lines 122, and the plurality of photosensitive data lines 142 are arranged in a similar manner to the data lines 123, and details are referred to the foregoing, and will not be described herein.

[0072] Optionally, as shown in the figure, Figure 5 As shown, the insulating layer includes a first insulating layer 143 and a second insulating layer 144, and the second insulating layer 144 is arranged on the surface of the first insulating layer 143 away from the first substrate 121. The first insulating layer 143 is used to insulate the photosensitive scanning lines 141 and the photosensitive data lines 142, and the second insulating layer 144 covers the photosensitive data lines 142, and is used to protect the photosensitive device 14.

[0073] Optionally, the material of the light-shielding layer 128 can be magnesium oxide, aluminum oxide, silver oxide, etc., and the specific material is not limited.

[0074] By arranging the first substrate 12 to further include the light-shielding layer 128, the light-shielding layer 128 is arranged on the side of the insulating layer away from the first substrate 121, and the photosensitive device 14 is arranged in the insulating layer, so that the light-shielding layer 128 can avoid external light from entering and affecting the photosensitive device 14, and improve the identification accuracy of the photosensitive device 14.

[0075] In another embodiment, as shown in the figure, Figure 3 As shown, the second substrate 11 includes a second substrate 112, a light-shielding member, and an insulating layer arranged in sequence, at least part of the insulating layer is arranged on the side of the light-shielding member 113 away from the second substrate 112, and the surface of the insulating layer away from the second substrate 112 faces the first substrate 12, and the photosensitive device 14 is arranged in the insulating layer of the light-shielding member 113.

[0076] Optionally, the second substrate 11 further comprises a plurality of photosensitive scanning lines 141 and a plurality of photosensitive data lines 142, which are arranged on the side of the second substrate 112 facing the first substrate 12. The photosensitive scanning lines 141 and the scanning lines 122 are arranged in the same manner as described above, and thus will not be described again.

[0077] Optionally, the light shielding member 113 can be made of magnesium oxide, aluminum oxide, silver oxide, etc. without limitation. Optionally, the number of the light shielding member 113 corresponds to the photosensitive device 14, and the light shielding member 113 is arranged corresponding to the photosensitive device 14 in the insulating layer, i.e., in the Z direction, the light shielding member 113 shields the photosensitive device 14 to avoid the influence of the incident light on the photosensitive device 14.

[0078] Similarly, the insulating layer comprises a first insulating layer 143 and a second insulating layer 144, the second insulating layer 144 is arranged on the surface of the first insulating layer 143 away from the light shielding member 113, the first insulating layer 143 is used to insulate the photosensitive scanning lines 141 and the photosensitive data lines 142, and the second insulating layer 144 covers the photosensitive data lines 142 to protect the photosensitive device 14.

[0079] By arranging at least part of the insulating layer on the side of the light shielding member 113 away from the second substrate 112, and arranging the surface of the insulating layer away from the second substrate 112 to face the first substrate 12, the light shielding member 113 can avoid the influence of the light incident from the second substrate 11 on the normal operation of the photosensitive device 14, and improve the recognition accuracy of the photosensitive device 14.

[0080] Optionally, as shown in Figure 3 in the third direction Z, the photosensitive device 14 shields at least part of the thin film transistor 125. In one embodiment, the photosensitive device 14 is arranged opposite to the thin film transistor 125 in the third direction Z, which can reduce the area of the photosensitive device 14 and the thin film transistor 125 in the third direction Z, and increase the light-emitting area of the pixel 15, thereby improving the light-emitting efficiency.

[0081] When the photosensitive device 14 is arranged in the second substrate 11, without applying writing pressure, as shown in Figure 3 the bistable liquid crystal layer 13 of the pixel 15 is in a scattering state, the writing board 10 presents a background color, the photosensitive device 14 is not irradiated by light, and is in an off state without emitting an electrical signal. The processing module 17 recognizes this place as an unwritten state, and records the state of the pixel 15 as 0. When the writing pressure is applied to the writing board 10, as shown in Figure 2 the bistable liquid crystal layer 13 of the pixel 15 under pressure is converted from the scattering state to the reflective state under the action of external pressure. The liquid crystal molecules in the reflective state can reflect certain wavelengths of light in the incident ambient light, so that the writing board 10 can display the written characters. The reflected light is reflected to the photosensitive device 14, and the photosensitive device 14 is irradiated by the reflected light, and is in an on state to emit an electrical signal. The processing module 17 recognizes this place as a written state, and records the state of the pixel 15 as 1.Figure 2 As shown in A1, the light rays in the unwritten area are as follows: Figure 2 As shown in A2. When the reflected light A1 shines on the photosensitive device 14, the photosensitive device 14 generates charge carriers under the illumination of the reflected light, causing the device to conduct and emit an electrical signal. The processing module 17 reads the corresponding electrical signal and identifies that this is a writing state, records it as 1, and realizes the conversion of the current writing handwriting into data storage of 0 and 1.

[0082] When restoring the handwriting, the processing module 17 outputs a corresponding electrical signal or control signal based on the stored data, and drives the bistable liquid crystal layer 13 of the pixel 15 to undergo a corresponding state change based on the electrical signal or control signal, thereby realizing the restoration of the handwriting.

[0083] When the photosensitive device 14 is disposed on the first substrate 12, and no writing pressure is applied, such as Figure 5 As shown, the bistable liquid crystal layer 13 of pixel 15 is in a scattering state, and the writing pad 10 displays the background color. Light can pass through the bistable liquid crystal layer 13 of pixel 15 and illuminate the photosensitive device 14. Under the illumination of the reflected light, the photosensitive device 14 generates charge carriers, causing the device to conduct and emit an electrical signal. The processing module 17 reads the corresponding electrical signal and identifies this as an unwritten state, recording it as 1. When writing pressure is applied to the writing pad 10, such as Figure 6 As shown, the bistable liquid crystal layer 13 of pixel 15 at the pressure point changes from a scattering state to a reflecting state under external pressure. The liquid crystal molecules in the reflecting state can reflect light of a certain wavelength in the incident ambient light, allowing the writing board 10 to display handwriting. At this time, the reflected light cannot reach the photosensitive device 14, and the photosensitive device 14 is in a closed state without light and does not emit an electrical signal. The processing module 17 recognizes this as a writing state and records the state of pixel 15 as 0, thus converting the current handwriting into data storage of 0 and 1.

[0084] When restoring the handwriting, the processing module 17 outputs a corresponding electrical signal or control signal based on the stored data, and drives the bistable liquid crystal layer 13 of the pixel 15 to undergo a corresponding state change based on the electrical signal or control signal, thereby realizing the restoration of the handwriting.

[0085] Optional, such as Figure 7 As shown, in one embodiment, there are two writing boards 10, and the first substrates 12 of the two writing boards 10 are opposite to each other and connected.

[0086] Optionally, the first substrates 12 of the two writing boards 10 can be connected by means of adhesive, snap-fit, screw, magnetic connection, etc., without any specific limitation.

[0087] By setting two writing boards 10, the first substrates 12 of the two writing boards 10 are opposite and connected, and the second substrates 11 of the two writing boards 10 are used to receive writing pressure, so that double-side writing can be realized, and the practicability of the writing board 10 is improved.

[0088] Optionally, as shown in Figure 7 The writing board 10 includes a connector 16, the connector 16 is electrically connected with the processing module 17, and the connectors 16 of the two writing boards 10 are electrically connected.

[0089] Optionally, the connector 16 is used for realizing data intercommunication between the two writing boards 10, and the connectors 16 of the two writing boards 10 can be connected through plug-in connection, clamping connection, magnetic attraction connection and the like, and the specific mode is not limited.

[0090] The two writing boards 10 are connected through the connector 16, the handwriting data of one writing board 10 after writing can be transmitted to the other writing board 10, and is converted into an electric signal for display in the writing board 10, so that the function of double-side handwriting can be further realized, and the practicability of the writing board 10 is improved.

[0091] Please refer to Figure 8 The application also provides a driving method of the writing board 10, which is applied to the writing board 10 in the application, and the driving method of the writing board 10 includes the following steps.

[0092] In step S10, writing pressure is provided to the second substrate 11 to display handwriting, the photosensitive device 14 receives light rays from the second substrate 11 and passing through the bistable liquid crystal layer 13, and outputs an electric signal to the processing module 17, and the processing module 17 receives and records the electric signal;

[0093] In step S20, the driving circuit 18 provides a first voltage difference to the bistable liquid crystal layer 13, so that the state of the bistable liquid crystal layer 13 subjected to the writing pressure is transformed into the state before the writing pressure is subjected, to erase the handwriting.

[0094] In step S30, the processing module 17 outputs the electric signal as a control signal, and the driving circuit 18 provides a second voltage difference to the bistable liquid crystal layer 13 according to the control signal, to control the state transformation of the bistable liquid crystal layer 13 to restore the handwriting.

[0095] In another embodiment, when step S30 is performed, the processing module 17 directly outputs the electric signal, and the driving circuit 18 provides the second voltage difference to the bistable liquid crystal layer 13 according to the electric signal, to control the state transformation of the bistable liquid crystal layer 13 to restore the handwriting.

[0096] The step S10 is executed, that is, a writing action, the writing board 10 displays the writing, and the processing module 17 stores the electrical signal after receiving the electrical signal. The step S20 is executed, that is, an erasing action of the writing board 10, the writing displayed on the writing board 10 can be erased.

[0097] The steps S10 to S30 are executed in sequence, that is, a restoring action of the writing board 10, the writing on the writing board 10 is converted into an electrical signal and stored when writing, and after the writing on the writing board 10 is erased, the writing can be restored according to the stored electrical signal.

[0098] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the drawings described, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0099] The above only discloses one preferred embodiment of the present application, of course cannot limit the scope of the present application, and those skilled in the art can understand that all or part of the above-mentioned embodiments can be implemented, and equivalent changes made according to the claims of the present application still belong to the scope of the present application.

Claims

1. A writing board, characterized by The writing board comprises: a first substrate; a second substrate, which is arranged opposite to the first substrate and is used for receiving writing pressure and displaying writing; a bistable liquid crystal layer, which is arranged between the first substrate and the second substrate; a photosensitive device, which is used for receiving light from the second substrate and passing through the bistable liquid crystal layer and outputting an electrical signal; a processing module, which is electrically connected with the photosensitive device, and is used for receiving and recording the electrical signal and controlling state transformation of the bistable liquid crystal layer to restore the writing. The first substrate is provided with a pixel electrode and a thin film transistor, the second substrate comprises a common electrode, and a voltage difference is formed between the pixel electrode and the common electrode; the second substrate comprises a second substrate, a light shielding member and an insulating layer arranged in sequence, at least part of the insulating layer is arranged on a side of the light shielding member away from the second substrate, and a surface of the insulating layer away from the second substrate faces the first substrate, and the photosensitive device is arranged in the insulating layer.

2. The writing tablet according to claim 1, wherein The processing module is further used for outputting the electrical signal, the electrical signal controls state transformation of the bistable liquid crystal layer to restore the writing, or the processing module is further used for converting the electrical signal into a control signal and outputting the control signal, the control signal is used for controlling state transformation of the bistable liquid crystal layer to restore the writing.

3. The writing tablet of claim 1, wherein The writing board comprises a driving circuit and a plurality of pixels arranged in an array, the plurality of pixels are used for displaying the writing; the driving circuit is electrically connected with the processing module and the plurality of pixels, a signal output by the processing module is output to the driving circuit, and the driving circuit is used for driving state transformation of the bistable liquid crystal layer.

4. The writing tablet according to claim 3, wherein The first substrate comprises a plurality of scanning lines and a plurality of data lines, the plurality of scanning lines extend along a first direction, the plurality of data lines extend along a second direction, the first direction intersects the second direction, each pixel is connected with a scanning line and a data line, the pixel comprises the pixel electrode and the thin film transistor arranged in the first substrate, a gate of the thin film transistor is electrically connected with the scanning line, a source of the thin film transistor is electrically connected with the data line, a drain of the thin film transistor is electrically connected with the pixel electrode, and the driving circuit is used for providing a voltage difference between the pixel electrode and the common electrode.

5. The writing tablet of claim 4, wherein The second substrate and the first substrate are opposite in a third direction, and in an orthographic projection in the third direction, the light shielding member shields at least part of the thin film transistor, and the third direction intersects both the first direction and the second direction.

6. A writing tablet according to any one of claims 1 to 5, wherein The writing board is two, the first substrates of the two writing boards are opposite and connected, the writing board comprises a connector, the connector is electrically connected with the processing module, and the connectors of the two writing boards are electrically connected.

7. A method of driving a writing board, characterized by, The driving method of the writing board of any one of claims 1 to 6 comprises: The second substrate is provided with a writing pressure to display a writing, the photosensitive device receives light from the second substrate and passing through the bistable liquid crystal layer, and outputs an electrical signal to the processing module, the processing module receives and records the electrical signal; The driving circuit provides a first voltage difference to the bistable liquid crystal layer, so that the state of the bistable liquid crystal layer subjected to the writing pressure is transformed to the state before the writing pressure, to erase the writing; The processing module outputs the electrical signal as a control signal, the driving circuit provides a second voltage difference to the bistable liquid crystal layer according to the control signal, to control the state transformation of the bistable liquid crystal layer to restore the writing.

8. A writing device, characterized by A writing board as claimed in any one of claims 1 to 6 is housed in a housing.

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