Handwriting pad and control method thereof, handwriting pad substrate and manufacturing method thereof

Abstract

The embodiment of the invention provides a handwriting board, a control method thereof, a handwriting board substrate and a manufacturing method thereof. The handwriting board comprises a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate and the second substrate are oppositely arranged; the liquid crystal layer is arranged between the first substrate and the second substrate; the first substrate comprises a plurality of first electrodes arranged in an array; each first electrode comprises a positioning electrode and an erasing electrode; the positioning electrode and the erasing electrode in each first electrode are arranged on the same layer; wherein the positioning electrodes are arranged at the first corners of the first electrodes, and the erasing electrodes are arranged on the two sides, away from the first corners, of the positioning electrodes in a surrounding mode. According to the embodiment of the invention, the positioning electrode is used for accurately positioning the position of the touch operation, and the erasing electrode is used for erasing the liquid crystal, so that the local erasing function of the handwriting board is efficiently realized.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of display devices, and in particular to a handwriting tablet and a control method thereof, a handwriting tablet substrate and a manufacturing method thereof. Background Art

[0002] The handwriting tablet can record and display handwritten handwriting and patterns through pressure touch sensing. The current LCD handwriting tablet can realize writing and drawing with low power consumption, environmental protection and portability, and can be reused after erasing. In addition to full-screen erasing, related technologies also propose partial erasing of handwriting tablets. With the popularity of large-size handwriting tablets, users often need to modify local handwriting and patterns. Therefore, the current user demand for partial erasing of handwriting tablets is gradually increasing. However, in order to realize the partial erasing function, the current handwriting tablets often greatly increase the size and weight of the handwriting device, which will also cause a significant increase in costs, and the user's operating experience needs to be further improved.

[0003] It should be noted that the information distinguishing the invention in the above background technology is only configured to enhance the understanding of the background of the invention, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the invention

[0004] The embodiments of the present application provide a handwriting tablet and a control method thereof, a handwriting tablet substrate and a manufacturing method thereof, aiming to efficiently realize the local erasing function of the handwriting tablet.

[0005] In one aspect, an embodiment of the present application provides a handwriting tablet, comprising: a first substrate and a second substrate arranged opposite to each other, and a liquid crystal layer between the first substrate and the second substrate;

[0006] The first substrate comprises: a plurality of first electrodes arranged in an array; each of the first electrodes comprises: a positioning electrode and an erasing electrode;

[0007] The positioning electrode in each of the first electrodes is arranged in the same layer as the erasing electrode;

[0008] The positioning electrode is arranged at a first corner of each of the first electrodes, and the erasing electrode is arranged around two sides of the positioning electrode away from the first corner.

[0009] Optionally, the liquid crystal layer includes: liquid crystal molecules;

[0010] The positioning electrode is configured to collect touch operation signals;

[0011] The erasing electrode is configured to control the liquid crystal molecules on one side of the erasing electrode at the touch position to be in a scattering state when powered on.

[0012] Optionally, it further includes: a control unit; the first substrate further includes: a plurality of thin film transistor switches; the thin film transistor switches are electrically connected to the erasing electrodes one by one;

[0013] The control unit is configured to control the thin film transistor switch electrically connected to the erasing electrode located at the touch position to be turned on according to the touch operation signal.

[0014] Optionally, the second substrate includes: a second electrode;

[0015] The first substrate further comprises: a first protective substrate located on a side of the first electrode away from the liquid crystal layer; the first protective substrate has a preset elastic modulus along a normal direction of the first substrate;

[0016] The positioning electrode is further configured to provide a sensing signal, and to collect the touch operation signal based on a change in the sensing signal when the first protective substrate is deformed.

[0017] Optionally, the second substrate comprises: a second electrode and a second protective substrate located on a side of the second electrode away from the liquid crystal layer; the second protective substrate has a preset elastic modulus along a normal direction of the second substrate;

[0018] The positioning electrode is further configured to provide a sensing signal, and to collect the touch operation signal based on a change in the sensing signal when the second protective substrate is deformed.

[0019] Optionally, the first substrate further comprises: a plurality of thin film transistor switches, mutually insulated and overlapped first metal lines and second metal lines, mutually insulated and overlapped data lines and gate lines; wherein the first metal lines, the second metal lines, the data lines and the gate lines form a plurality of grids, and the first electrodes are disposed in each of the grids;

[0020] Wherein, the erasing electrode is electrically connected to the gate line and the data line respectively through the thin film transistor switch, and the positioning electrode is electrically connected to the first metal line and the second metal line respectively.

[0021] Optionally, it further comprises: a passivation layer disposed between the first electrode and the gate line; the passivation layer is provided with a first via hole and a second via hole;

[0022] The erasing electrode extends and is electrically connected to the gate line and the data line respectively through the first via hole, and the positioning electrode extends and is electrically connected to the first metal line through the second via hole.

[0023] Optionally, it further comprises: a gate insulating layer, wherein the second metal line and the gate line are arranged in the gate insulating layer; the gate insulating layer is provided with a third via hole connected to the second via hole;

[0024] The positioning electrode extends and sequentially passes through the second via hole and the third via hole to be electrically connected to the second metal wire.

[0025] Optionally, the length of the erasing electrode is between 4 and 5 times the length of the positioning electrode.

[0026] Compared with the prior art, the advantages of the embodiments of the present application are:

[0027] In the embodiment of the present application, an arrayed combination of positioning electrodes and erasing electrodes are set in a substrate on one side of the handwriting board. The positioning electrode can be used to locate the area of ​​the handwriting board that needs to be erased, and the erasing electrode can be used to erase the display state of the liquid crystal molecules on one side, so that the erased area displays a blank screen, which can achieve a quick response to the erasing demand of the handwriting board, thereby achieving low-cost, efficient and convenient local erasing of the handwriting board. The positioning electrode is set on the same layer as the erasing electrode, and the positioning electrode is set at the first corner. While maintaining low cost, the area of ​​the erasing electrode can be minimized to reduce the impact on the erasing effect, which helps to further reduce the production cost of the handwriting board with local erasing function and improve the user experience.

[0028] In another aspect, the present application also provides a control method of a handwriting tablet, which is applied to the handwriting tablet in the above embodiment, including:

[0029] The positioning electrodes collect touch operation signals;

[0030] The erasing electrode located at the touch position is energized to control the liquid crystal molecules located on one side of the current erasing electrode to be in a scattering state.

[0031] Compared with the prior art, the advantages of the above embodiment are:

[0032] Compared with the prior art, the control method of the handwriting tablet provided in the embodiment of the present application is applied to the handwriting tablet in the above implementation, has all the advantages of the above handwriting tablet, and can achieve a quick response to local erasure.

[0033] In another aspect, the present application also provides a handwriting tablet substrate, including:

[0034] substrate substrate;

[0035] A gate insulating layer located on one side of the base substrate, wherein a gate line and a second metal line are arranged in the gate insulating layer;

[0036] A passivation layer located on a side of the gate insulation layer away from the base substrate, wherein a first metal line and a data line are arranged in the passivation layer;

[0037] A plurality of first electrodes arranged in an array on a side of the passivation layer away from the gate insulating layer, each of the first electrodes comprising: a positioning electrode and an erasing electrode;

[0038] The positioning electrode in each of the first electrodes is arranged in the same layer as the erasing electrode, the positioning electrode is arranged at a first corner of each of the first electrodes, and the erasing electrode is arranged around two sides of the positioning electrode away from the first corner.

[0039] Compared with the prior art, the advantages of the embodiments of the present application are:

[0040] The handwriting tablet substrate provided in the present application can be used to manufacture a handwriting tablet. Not only can the positioning electrodes be used to collect touch operation signals and the erasing electrodes be used to erase the display state of liquid crystal molecules, but the positioning electrodes and the erasing electrodes can also be arranged in the same layer in the substrate, effectively saving materials and manufacturing processes, and reducing the coupling between metal components, thereby further improving the component performance of the handwriting tablet.

[0041] In another aspect, the present application also provides a method for manufacturing a handwriting tablet substrate, comprising:

[0042] providing a substrate base plate;

[0043] A gate insulating layer is manufactured on one side of the base substrate, wherein a gate line and a second metal line are arranged in the gate insulating layer;

[0044] A passivation layer is formed on a side of the gate insulation layer away from the base substrate, wherein a first metal line and a data line are arranged in the passivation layer;

[0045] A plurality of first electrodes arranged in an array are fabricated on a side of the passivation layer away from the gate insulating layer, each of the first electrodes comprising: a positioning electrode and an erasing electrode;

[0046] The positioning electrode in each of the first electrodes is arranged in the same layer as the erasing electrode, the positioning electrode is arranged at a first corner of each of the first electrodes, and the erasing electrode is arranged around two sides of the positioning electrode away from the first corner.

[0047] Compared with the prior art, the method for manufacturing a handwriting tablet substrate provided in the embodiment of the present application has all the advantages of the above-mentioned handwriting tablets, and can also be manufactured through the process within the substrate, effectively reducing the manufacturing cost of a handwriting tablet that can achieve partial erasure. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this application. The technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0049] Figure 1 A schematic cross-sectional structure diagram of a handwriting tablet in an embodiment provided by the present application is shown.

[0050] Figure 2 A front schematic diagram of a handwriting tablet substrate in an embodiment provided in the present application is shown.

[0051] Figure 3 A first cross-sectional structural schematic diagram of a handwriting tablet substrate in an embodiment provided in the present application is shown.

[0052] Figure 4 A second cross-sectional structural schematic diagram of a handwriting tablet substrate in an embodiment provided in the present application is shown.

[0053] Figure 5 A schematic diagram of the direction structure of a handwriting board in an embodiment provided by the present application is shown.

[0054] Figure 6 A schematic diagram of the direction structure of a handwriting board in another embodiment provided by the present application is shown.

[0055] Figure 7 A flowchart of a method for controlling a handwriting board in an embodiment provided by the present application is shown.

[0056] Figure 8 A flowchart of the steps of a method for manufacturing a handwriting tablet substrate in an embodiment provided by the present application is shown. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0058] In order to realize the partial erasing function of the handwriting tablet, the related technology uses positioning means such as infrared positioning, uses infrared detectors set around the whole machine of the handwriting device to determine the designated erasing position, and then applies an electric field in the corresponding erasing area to achieve the effect of partial erasing. However, the handwriting tablet that realizes the partial erasing function by using the above positioning means not only has low positioning accuracy, but also has a heavy structure and high cost. Due to the slow response speed, the user's handwriting tablet experience needs to be improved.

[0059] In view of the above problems, the embodiments of the present application provide a handwriting tablet and a control method thereof, a handwriting tablet substrate and a manufacturing method thereof, aiming to efficiently realize the local erasing function of the handwriting tablet.

[0060] The embodiments of the present application are described below with reference to the accompanying drawings.

[0061] Reference Figure 1 , Figure 1 FIG. 2 shows a schematic cross-sectional structure diagram of a handwriting board in an embodiment provided by the present application. Figure 1 As shown, an embodiment of the present application provides a handwriting tablet, including: a first substrate 10 and a second substrate 20 arranged opposite to each other, and a liquid crystal layer 30 between the first substrate 10 and the second substrate 20 .

[0062] The first substrate 10 and the second substrate 20 may be arranged in a box, and the liquid crystal layer 30 is arranged in the box.

[0063] The first substrate 10 includes: a plurality of first electrodes 110 arranged in an array. Each first electrode 110 includes: a positioning electrode 111 and an erasing electrode 112 .

[0064] In order to save materials and manufacturing processes and reduce coupling between metal components, the present embodiment considers setting the positioning electrode 111 and the erasing electrode 112 in the same layer. To this end, in the present embodiment, the positioning electrode 111 and the erasing electrode 112 in each first electrode 110 are set in the same layer.

[0065] Furthermore, in an optional example, the positioning electrode 111 and the erasing electrode 112 can be manufactured in the same process.

[0066] The positioning electrode 111 is disposed at a first corner of each first electrode 110 , and the erasing electrode 112 is disposed around two sides of the positioning electrode 111 away from the first corner.

[0067] In an optional example, the first electrodes can be arranged one by one in a plurality of orthogonal grids, and the first angle is an angle in the same direction in each orthogonal grid. In some optional embodiments, the handwriting board can also include a plurality of thin film transistor switches. The thin film transistor switch 120 can be arranged at a second angle of each first electrode 110, and the first angle and the second angle can be diagonally opposite.

[0068] Through the above-mentioned embodiments, the thin film transistor switches 120 and the positioning electrodes 111 can be dispersed and arranged to the greatest extent in each grid of the first electrode 110 array, so that when the erasing electrode 112 is arranged in the same layer as the positioning electrode 111, it can also have the maximum range of radiation control on the state of the liquid crystal molecules 301 on one side of the grid, thereby reducing or avoiding the situation where the handwriting board is not erased cleanly.

[0069] In some optional embodiments, the liquid crystal layer 30 includes: liquid crystal molecules 301 .

[0070] In some optional embodiments, the liquid crystal layer 30 may be a bistable liquid crystal layer 30 , and the liquid crystal molecules 301 may be bistable liquid crystal molecules 301 .

[0071] Specifically, the bistable liquid crystal layer 30 may include two states: a reflective state and a scattering state.

[0072] The reflective state means that the liquid crystal molecules in the designated area of ​​the liquid crystal layer 30 are arranged in the same direction. In the reflective state, light can be orderly reflected by the liquid crystal layer, thereby realizing the display of colored patterns, such as green.

[0073] The scattering state refers to the disordered arrangement of liquid crystal molecules in a specified area of ​​the liquid crystal layer 30. In the scattering state, light can only be scattered randomly through the liquid crystal layer, so that only the color of the background at the bottom of the liquid crystal layer, such as black, can be displayed.

[0074] When the handwriting board is erased, the bistable liquid crystal layer 30 is in a scattering state, and the handwriting board is in a blank state in the erased area, and no handwriting or pattern is displayed. When the handwriting board is touched, the bistable liquid crystal layer 30 in the pressed and touched area remains in a reflective state, and the handwriting board can record and write in the touched area, and display handwriting or pattern.

[0075] In some optional embodiments, the handwriting board can display black in a blank state and can display green in a writing state.

[0076] like Figure 5 or Figure 6As shown, further, in order to display black in a blank state, in some optional embodiments, the handwriting board can be provided with a black substrate film layer 402 on the side facing away from the touch cover. Specifically, the black substrate film layer 402 can be provided on the side of the glass substrate away from the liquid crystal layer.

[0077] The black substrate film layer 402 may include an organic ink material.

[0078] For example, Figure 5 As shown, when the first substrate is used as the upper substrate, the black substrate film layer 402 can be arranged on a side of the second protective substrate away from the liquid crystal layer.

[0079] In another example, Figure 6 As shown, when the second substrate is used as the upper substrate, the black substrate film layer 402 can be arranged on a side of the first protective substrate away from the liquid crystal layer.

[0080] Furthermore, in order to display the required color in the writing state, in an optional example, liquid crystal molecules with corresponding characteristics can be pre-set in the handwriting board, and any color including the three primary colors of RGB can be displayed by using the molecular structure characteristics of the liquid crystal molecules themselves, so as to display handwriting or patterns with corresponding colors. Exemplarily, the liquid crystal molecules can include: green liquid crystal molecules that reflect green light.

[0081] Furthermore, in order to display multiple colors in the writing state, in an optional example, a variety of liquid crystal molecules with different characteristics and corresponding electric drive components can be arranged in the handwriting board. For example, three sub-liquid crystal layers corresponding to RGB colors are stacked, and the three primary colors of RGB are displayed respectively by controlling the deflection of the multiple liquid crystal molecules, thereby displaying colorful handwriting or patterns through the combination of colors.

[0082] In some optional embodiments, the first substrate 10 may include a plurality of grids arranged in an array, and the first electrodes 110 are disposed one by one in each grid. The grids may include: orthogonal grids.

[0083] Through the above-mentioned embodiment, the grid arrangement of the erasing electrodes and the positioning electrodes is used to help improve the positioning accuracy of the erasing area, and also to help achieve segmented erasing, and reduce or avoid the occurrence of missed erasing through a more stable erasing voltage.

[0084] Further, in an optional example, the positioning electrodes 111 and the erasing electrodes 112 in each first electrode 110 may be arranged in the same layer and in the same orthogonal grid.

[0085] The positioning electrode 111 is configured to collect touch operation signals.

[0086] In some optional embodiments, the positioning electrode 111 may be configured to collect a touch operation signal pressed at the position of the handwriting board where the positioning electrode 111 is located.

[0087] In an optional example, in the erasing mode, the positioning electrode 111 may continuously input a periodic sensing signal.

[0088] In an optional example, under the influence of the pressure touch operation of the handwriting tablet, the first substrate 10 or the second substrate 20 is deformed at the position of the pressure touch operation, and the capacitance or voltage difference between the positioning electrode 111 at this position and the second substrate 20 changes, causing the sensing signal to change according to the change in capacitance or voltage difference caused by the pressure touch operation, so that the positioning electrode 111 at this position collects the touch operation signal.

[0089] The erasing electrode 112 is configured to control the liquid crystal molecules 301 on one side of the erasing electrode 112 at the touch position to be in a scattering state when powered on.

[0090] In some optional embodiments, the erasing electrode 112 may form an electric field with the second substrate 20 to change the state of the liquid crystal molecules 301 so that the liquid crystal molecules 301 between the erasing electrode 112 and the second substrate 20 are in a scattering state.

[0091] Furthermore, the erasing electrode 112 in the first electrode 110 may occupy a larger area, so that the electric field formed by the erasing electrode 112 and the second substrate 20 may radiate and affect the state of the liquid crystal molecules 301 between the entire first electrode and the second substrate 20 .

[0092] In an optional example, in the erasing mode, the positioning electrode 111 obtains the touch operation signal of the touch position, and then energizes the erasing electrode 112 at the touch position, so that an electric field is formed between the erasing electrode 112 at the touch position and the second substrate 20, thereby controlling the state of the liquid crystal molecules 301 at the touch position, so that the touch position is partially erased.

[0093] Through the above-mentioned embodiments, an arrayed combination of positioning electrodes and erasing electrodes is set in a substrate on one side of the handwriting board. The positioning electrode can be used to locate the handwriting board area that needs to be erased, and the erasing electrode can be used to erase the display state of the liquid crystal molecules on one side, so that the erased area displays a blank screen, which can achieve a quick response to the erasing demand of the handwriting board, thereby realizing low-cost, efficient and convenient local erasing of the handwriting board. The positioning electrode and the erasing electrode are set on the same layer, and the positioning electrode is set at the first corner. While maintaining low cost, the area of ​​the erasing electrode can be minimized to reduce the impact on the erasing effect, which helps to further reduce the production cost of the handwriting board with local erasing function and improve the user experience.

[0094] Furthermore, in some optional embodiments, an erase mode switch may be provided in the handwriting board. When the erase mode switch is turned on, the positioning electrode 111 receives a sensing signal, thereby positioning the touch position to be erased.

[0095] Through the above embodiment, in the erasing mode, the capacitance change between the first substrate 10 and the second substrate 20 caused by the user pressing the handwriting board can be converted into a voltage signal, and presented in the change of the sensing signal with the periodic sensing model output, so that the integrated circuit obtains and records the erasing area, instructs the erasing electrode 112 at the corresponding position to power on, and controls the liquid crystal molecules 301 to deflect to the scattering state, so as to achieve partial erasing of the handwriting board. The above embodiment can embed the positioning method into the handwriting board substrate, realize the positioning of the erasing area, and can quickly respond to complete the partial erasing, without the need for a complex whole machine structure to cooperate with the use, greatly reducing the weight and volume of the whole machine of the handwriting board with partial erasing function.

[0096] The present application considers using integrated circuits to process signals, and, in order to facilitate signal control, also considers using thin film transistors (TFTs) to control the power supply of the erase electrode 112. To this end, in an optional embodiment, the present application also provides a handwriting board, including: a control unit (not shown in the figure).

[0097] In an optional implementation, the control unit may be disposed on a side of the first substrate or the second substrate away from the liquid crystal layer, and specifically may be disposed on the back side of the touch cover of the handwriting board.

[0098] Reference Figure 2 , Figure 2 FIG. 2 shows a front view of a handwriting board substrate in an embodiment provided by the present application. Figure 2 As shown, the first substrate 10 further includes: a plurality of thin film transistor switches 120. The thin film transistor switches 120 are electrically connected to the erasing electrodes 112 in a one-to-one correspondence.

[0099] The thin film transistor switches 120 may correspond one-to-one to each of the first electrodes 110 , and may also correspond one-to-one to the positioning electrodes 111 .

[0100] In an alternative example, see Figure 2The first substrate 10 may include a plurality of orthogonal grids, which may be formed by insulating overlaps of a plurality of data lines 151, gate lines 152, first metal lines 141, and second metal lines 142. The first electrode 110 may be in a block shape, and one first electrode 110 and one thin-film transistor switch 120 may be provided in each orthogonal grid. Therefore, one erasing electrode 112, one positioning electrode 111, and one thin-film transistor switch 120 may be provided in each orthogonal grid, and the erasing electrode 112 may be electrically connected to the source electrode 121 of the thin-film transistor switch 120. Among them, the drain electrode 122 of the thin-film transistor switch 120 may be electrically connected to the data line 151, and the gate electrode 124 of the thin-film transistor switch 120 may be electrically connected to the gate line 152, so that the erasing electrode 112 is electrically connected to the gate line 152 and the data line 151 respectively through the thin-film transistor switch 120.

[0101] The control unit is configured to control the thin-film transistor switch 120 electrically connected to the erasing electrode 112 located at the touch position to turn on according to the touch operation signal.

[0102] In this embodiment, the positioning electrode 111 located at the touch position is affected by the touch operation, can generate and collect the touch operation signal, the thin-film transistor switch 120 at the touch position is also turned on accordingly, and the erasing electrode 112 at the touch position is electrified, so that the liquid crystal molecules 301 at the touch position are affected by the electric field, and the liquid crystal deflection state is in a scattering state.

[0103] In the embodiment of the present application, the touch position can be accurate to each grid where each first electrode 110 is located.

[0104] The embodiment of the present application considers setting an electrode in the second substrate 20 to accurately sense the touch operation for erasing the writing board.

[0105] Refer to Figure 5 , Figure 5 shows a schematic diagram of the direction structure of a writing board in an embodiment provided by the present application. As Figure 5 shown, further, considering that the second electrode 210 is set as the common electrode on the front in the second substrate 20 and the device complexity is reduced, a touch cover plate can be set in the second substrate 20. For this purpose, in an optional embodiment, the present application further provides a writing board, wherein the second substrate 20 includes: a second electrode 210.

[0106] The first substrate 10 further includes: a first protective substrate 130 on the side of the first electrode 110 away from the liquid crystal layer 30. The first protective substrate 130 has a preset elastic modulus along the normal direction of the first substrate 10.

[0107] The first protective substrate 130 serves as an upward touch cover and may be made of a flexible thermoplastic polyester (Polyethylene terephthalate, PET) material.

[0108] The positioning electrode 111 is further configured to provide a sensing signal, and to collect a touch operation signal based on a change in the sensing signal when the first protective substrate 130 is deformed.

[0109] In an optional example, the sensing signal may be a periodic square wave signal, and the positioning electrode 111 may transmit the collected touch operation signal to the control unit during period intervals.

[0110] The sensing signal changes according to the change of the capacitance between the positioning electrode 111 and the second electrode 210 , and the capacitance between the positioning electrode 111 and the second electrode 210 changes according to the deformation of the first protective substrate 130 .

[0111] Exemplarily, when the first protective substrate 130 is a PET soft film used as a touch cover, under the pressure of a touch operation, the first protective substrate 130 is deformed, the distance between the first substrate 10 and the second substrate 20 at the touch position is reduced, the capacitance changes, and the voltage also decreases accordingly. The voltage signal is transmitted to the control unit via the first metal wire 141 or the second metal wire 142, and the touch position is recorded as an erasing area. The erasing area may include a grid where multiple first electrodes 110 are located.

[0112] The specific capacitance change can be found in formula (1):

[0113] C=εS / 4πkd=Q / U (1)

[0114] Wherein, C is the capacitance between the positioning electrode 111 and the second electrode 210. d is the distance between the positioning electrode 111 and the second electrode 210, which can be roughly regarded as the distance between the first substrate 10 and the second substrate 20. ε is the dielectric constant, which is determined according to the material properties of the electrode. S is the facing area between the positioning electrode and the second electrode. k is the electrostatic force constant. Q is the charge. U is the voltage.

[0115] The entire touch partial erasing process may specifically include: when the handwriting board is in the erasing mode, the common voltage of the area where the finger presses on the second substrate 20 is mutually capacitive with the positioning voltage of the first substrate 10 below, causing a change in capacitance, and the sensing signal is led out through the first metal line 141 or the second metal line 142, and the control unit obtains the position where the finger presses, and records the position as the erasing area. The integrated circuit in the control unit gives a signal to turn on the thin film transistor switch 120 at the corresponding touch position, and the erasing of the liquid crystal display at the position is completed under the action of the electric field provided by the erasing electrode 112.

[0116] Reference Figure 6 , Figure 6 FIG. 2 shows a schematic diagram of the direction structure of a handwriting board in another embodiment provided by the present application. Figure 6 As shown, the present application can also set the touch cover in the first substrate 10. To this end, in an optional embodiment, the present application also provides a handwriting tablet, and the second substrate 20 includes: a second electrode 210 and a second protective substrate 230 located on a side of the second electrode 210 away from the liquid crystal layer 30. The second protective substrate 230 has a preset elastic modulus along the normal direction of the second substrate 20.

[0117] The second protective substrate 230 serves as an upward touch cover and may be made of a flexible thermoplastic polyester material.

[0118] The positioning electrode 111 is further configured to provide a sensing signal, and to collect a touch operation signal based on a change in the sensing signal when the second protective substrate 230 is deformed.

[0119] The sensing signal changes according to the change of the capacitance between the positioning electrode 111 and the second electrode 210 , and the capacitance between the positioning electrode 111 and the second electrode 210 changes according to the deformation of the second protection substrate 230 .

[0120] In the embodiment of the present application, a second protective substrate 230 can be set in the first substrate 10 as an upward touch cover plate, so that the working principle of the positioning electrode 111 and the erasing electrode 112 can refer to the above embodiment of setting a touch cover plate in the second substrate 20, which can specifically include: when the handwriting board is in the erasing mode, the positioning voltage of the area where the finger presses on the first substrate 10 is mutually capacitive with the common voltage of the second substrate 20 below, causing a change in capacitance, and the sensing signal is led out through the first metal line 141 or the second metal line 142, and the control unit obtains the position where the finger is pressed, and records the position as the erasing area. The integrated circuit in the control unit gives a signal to turn on the thin film transistor switch 120 of the corresponding touch position, and the erasing of the liquid crystal display at the position is completed under the action of the electric field provided by the erasing electrode 112.

[0121] In some optional embodiments, when either the first substrate 10 or the second substrate 20 is provided with a flexible protective cover for obtaining a touch operation signal by deformation, the other substrate may be provided with a base substrate on a surface facing away from the liquid crystal layer 30. The base substrate may be made of glass or organic glass.

[0122] The present application considers setting up a gate line 152 and a data line 151, and realizing the power-on control of the erase electrode 112 by controlling the on-off of the thin film transistor switch 120. The present application also considers using a metal wire to enable the positioning electrode 111 to transmit a sensing signal in the erase mode. To this end, in an optional embodiment, the present application also provides a handwriting board, and the first substrate 10 also includes: a plurality of thin film transistor switches 120, a first metal line 141 and a second metal line 142 that are insulated and overlapped from each other, and a data line 151 and a gate line 152 that are insulated and overlapped from each other.

[0123] In some optional embodiments, the first metal line 141 and the data line 151 may extend along the first direction, and the second metal line 142 and the gate line 152 may extend along the second direction.

[0124] like Figure 2 As shown, in some optional embodiments, a first metal line 141 and a data line 151 extending along the first direction may be disposed between every two adjacent first electrodes 110 , or a second metal line 142 and a gate line 152 extending along the second direction may be disposed.

[0125] Further, in some optional embodiments, the first direction and the second direction may be perpendicular to each other.

[0126] The erasing electrode 112 is electrically connected to the gate line 152 and the data line 151 through the thin film transistor switch 120 , and the positioning electrode 111 is electrically connected to the first metal line 141 and the second metal line 142 .

[0127] Among them, Figure 2 As shown, the first metal lines, the second metal lines, the data lines and the gate lines form a plurality of grids, and a first electrode is disposed in each grid.

[0128] In an optional implementation, in any grid, the erasing electrode is located on a side of the positioning electrode away from the first metal line 141 electrically connected to the positioning electrode and away from a side of the second metal line 142 electrically connected to the positioning electrode.

[0129] In an optional implementation, in any grid, the erase electrode is located on a side of the thin film transistor switch 120 away from the data line 151 electrically connected to the thin film transistor switch 120 and away from a side of the gate line 152 electrically connected to the thin film transistor switch 120 .

[0130] Reference Figure 3 , Figure 3 FIG. 1 shows a first cross-sectional structural diagram of a handwriting board substrate in an embodiment provided by the present application. Figure 3As shown, in the embodiment of the present application, the first metal line 141 and the data line 151 can be set by using the passivation layer 160 (PVX), and vias can be set accordingly to achieve electrical connection between components. To this end, in an optional embodiment, the present application also provides a handwriting board, further comprising: a passivation layer 160, which is set between the first electrode 110 and the gate line 152. The passivation layer 160 is provided with a first via 161 and a second via 162.

[0131] The erase electrode 112 extends and is electrically connected to the gate line 152 and the data line 151 through the first via hole 161 , respectively. The positioning electrode 111 extends and is electrically connected to the first metal line 141 through the second via hole 162 .

[0132] Reference Figure 4 , Figure 4 FIG. 2 shows a second cross-sectional structural diagram of a handwriting tablet substrate in an embodiment provided by the present application. Figure 4 As shown, further, in the embodiment of the present application, the gate line 152 and the second metal line 142 can be set by using the gate insulation layer 170 (GI), and vias can be set accordingly to achieve electrical connection between components. To this end, in an optional embodiment, the present application also provides a handwriting tablet, further comprising: a gate insulation layer 170, and the second metal line 142 and the gate line 152 are set in the gate insulation layer 170. The gate insulation layer 170 is provided with a third via 171 connected to the second via 162.

[0133] The positioning electrode 111 extends and sequentially passes through the second via hole 162 and the third via hole 171 to be electrically connected to the second metal wire 142 .

[0134] In order to further ensure the local erasing capability of the handwriting board and reduce or avoid the situation where the handwriting board is not erased cleanly, the embodiment of the present application can also control the area of ​​the erasing electrode 112. To this end, in an optional implementation, the present application also provides a handwriting board, and the length of the erasing electrode 112 is between 4 and 5 times the length of the positioning electrode 111.

[0135] In the embodiment of the present application, the area of ​​a target object such as an electrode or a thin film transistor switch 120 may refer to the orthographic projection area of ​​the target object on the first substrate 10 or the second substrate 20 .

[0136] In an optional implementation, the total area of ​​the thin film transistor switch 120, the erasing electrode 112 and the positioning electrode 111 may be approximately equal to the area of ​​one grid. Exemplarily, the total size of the thin film transistor switch 120, the erasing electrode 112 and the positioning electrode 111 may be approximately 1 mm*1 mm, the positioning electrode 111 may be approximately 0.20 mm*0.20 mm, the positioning electrode 111 may be between one quarter and one fifth of the length of the erasing electrode 112, and the size of the thin film transistor switch 120 may be approximately 40 μm*25 μm.

[0137] Reference Figure 7 , Figure 7 FIG. 1 is a flowchart showing a method for controlling a handwriting board in an embodiment of the present application. Figure 7 As shown, based on the same inventive concept, the embodiment of the present application further provides a control method of a handwriting board, which is applied to the handwriting board in the above embodiment, comprising:

[0138] Step S601 : The positioning electrodes 111 collect touch operation signals.

[0139] In step S602 , the erasing electrode 112 at the touch position is energized to control the liquid crystal molecules 301 at one side of the current erasing electrode 112 to be in a scattering state.

[0140] Combination Figure 2 , Figure 3 and Figure 4 As shown, based on the same inventive concept, the embodiment of the present application further provides a handwriting tablet substrate, including:

[0141] Substrate substrate. Figure 3 As shown, the handwriting tablet substrate may include a first substrate, and the base substrate may be a first protective substrate 130 .

[0142] The gate insulating layer 170 is located on one side of the substrate, and the gate line 152 and the second metal line 142 are disposed in the gate insulating layer 170 .

[0143] Among them, Figure 4 As shown, the gate insulating layer 170 may further include: a third via hole 171 .

[0144] The passivation layer 160 is located on a side of the gate insulating layer 170 away from the base substrate, and the first metal line 141 and the data line 151 are disposed in the passivation layer 160 .

[0145] The passivation layer 160 may further include: a first via hole 161 and a second via hole 162 .

[0146] A plurality of first electrodes 110 are arranged in an array on a side of the passivation layer 160 away from the gate insulating layer 170 . Each of the first electrodes 110 includes a positioning electrode 111 and an erasing electrode 112 .

[0147] The positioning electrode 111 may extend to the second via hole 162 and the third via hole 171 , and the erasing electrode 112 may extend to the first via hole 161 .

[0148] The positioning electrode 111 and the erasing electrode 112 in each first electrode 110 are arranged in the same layer. The positioning electrode is arranged at a first corner of each first electrode, and the erasing electrodes are arranged around the positioning electrode on both sides away from the first corner.

[0149] Reference Figure 8 , Figure 8 FIG. 1 is a flowchart showing a method for manufacturing a handwriting tablet substrate in an embodiment of the present application. Figure 8 As shown, based on the same inventive concept, the embodiment of the present application also provides a method for manufacturing a handwriting tablet substrate, comprising:

[0150] Step S801, providing a base substrate.

[0151] Step S802 , a gate insulating layer 170 is manufactured on one side of the base substrate, and a gate line 152 and a second metal line 142 are disposed in the gate insulating layer 170 .

[0152] The gate line 152 and the second metal line 142 can be obtained by deposition at the same time.

[0153] The method may further include: manufacturing a third via hole 171 in the gate insulating layer 170 .

[0154] Step S803 , forming a passivation layer 160 on a side of the gate insulating layer 170 away from the base substrate, wherein the first metal line 141 and the data line 151 are disposed in the passivation layer 160 .

[0155] The first metal line 141 and the data line 151 can be obtained by deposition at the same time.

[0156] The method may further include: manufacturing a first via hole 161 and a second via hole 162 in the passivation layer 160 .

[0157] The first via hole 161 , the second via hole 162 , and the third via hole 171 in the embodiment of the present application can be obtained by a 6MASK or 7MASK process.

[0158] Step S801 : A plurality of first electrodes 110 arranged in an array are manufactured on a side of the passivation layer 160 away from the gate insulating layer 170 . Each first electrode 110 includes a positioning electrode 111 and an erasing electrode 112 .

[0159] The positioning electrode 111 may extend to the second via hole 162 and the third via hole 171 , and the erasing electrode 112 may extend to the first via hole 161 .

[0160] The positioning electrode 111 and the erasing electrode 112 in each first electrode 110 are arranged in the same layer. The positioning electrode is arranged at a first corner of each first electrode, and the erasing electrodes are arranged around the positioning electrode on both sides away from the first corner.

[0161] Based on the same inventive concept, an embodiment of the present application also provides a handwriting device, including: a handwriting tablet in the above embodiment, or a handwriting tablet substrate in the above embodiment, or a handwriting tablet substrate manufactured using the manufacturing method of the handwriting tablet substrate in the above embodiment.

[0162] Exemplarily, the handwriting device may include: a liquid crystal handwriting drawing device, a teaching device for demonstration via a handwriting board, etc.

[0163] As for the method embodiment or the handwriting tablet substrate embodiment, since they are basically similar to the handwriting tablet embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the handwriting tablet embodiment.

[0164] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0165] It should be noted that, unless otherwise clearly specified and limited, the drawings in the specification of this application are only used to illustrate and aid understanding, and the dimensions in the drawings cannot be used as a limitation on the contents of this application.

[0166] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0167] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only configured for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0168] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0169] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0170] In this application, the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or terminal device including the element.

[0171] It should be noted that, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0172] In the description of this application, unless otherwise specified, "same layer" means that two or more defined objects are in the same layer position in a stacking relationship, or are completely or partially in the same horizontal plane in the thickness direction of the stacking relationship.

[0173] Finally, it should be noted that specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only configured to help understand the technical solution and its core ideas of the present application. Although the preferred embodiments of the present application have been described, once the technical personnel in the field know the basic creative concepts, they can make additional changes and modifications to these embodiments. Therefore, the attached claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

Claims

1. A handwriting tablet, It is characterized in that include: A first substrate and a second substrate arranged opposite to each other, and a liquid crystal layer between the first substrate and the second substrate; The first substrate comprises: a plurality of first electrodes arranged in an array; each of the first electrodes comprises: a positioning electrode and an erasing electrode; The positioning electrode in each of the first electrodes is arranged in the same layer as the erasing electrode; The positioning electrode is arranged at a first corner of each of the first electrodes, and the erasing electrode is arranged around two sides of the positioning electrode away from the first corner.

2. The handwriting tablet according to claim 1, It is characterized in that The liquid crystal layer includes: liquid crystal molecules; The positioning electrode is configured to collect touch operation signals; The erasing electrode is configured to control the liquid crystal molecules on one side of the erasing electrode at the touch position to be in a scattering state when powered on.

3. The handwriting tablet according to claim 2, It is characterized in that Also includes: Control unit; The first substrate further comprises: a plurality of thin film transistor switches; the thin film transistor switches are electrically connected to the erasing electrodes one by one; The control unit is configured to control the thin film transistor switch electrically connected to the erasing electrode located at the touch position to be turned on according to the touch operation signal.

4. The handwriting tablet according to claim 23, It is characterized in that The second substrate includes: a second electrode; The first substrate further comprises: a first protective substrate located on a side of the first electrode away from the liquid crystal layer; the first protective substrate has a preset elastic modulus along a normal direction of the first substrate; The positioning electrode is further configured to provide a sensing signal, and to collect the touch operation signal based on a change in the sensing signal when the first protective substrate is deformed.

5. The handwriting tablet according to claim 3, It is characterized in that The second substrate comprises: a second electrode and a second protective substrate located on a side of the second electrode away from the liquid crystal layer; the second protective substrate has a preset elastic modulus along a normal direction of the second substrate; The positioning electrode is further configured to provide a sensing signal, and to collect the touch operation signal based on a change in the sensing signal when the second protective substrate is deformed.

6. The handwriting tablet according to claim 1, It is characterized in that The first substrate further comprises: a plurality of thin film transistor switches, mutually insulated and overlapped first and second metal lines, mutually insulated and overlapped data lines and gate lines; wherein the first metal lines, the second metal lines, the data lines and the gate lines form a plurality of grids, and the first electrodes are disposed in each of the grids; Wherein, the erasing electrode is electrically connected to the gate line and the data line respectively through the thin film transistor switch, and the positioning electrode is electrically connected to the first metal line and the second metal line respectively.

7. The handwriting tablet according to claim 6, It is characterized in that Also includes: A passivation layer is provided between the first electrode and the gate line; the passivation layer is provided with a first via hole and a second via hole; The erasing electrode extends to the first via hole and is electrically connected to the gate line and the data line respectively through the first via hole, and the positioning electrode extends to the second via hole and is electrically connected to the first metal line through the second via hole.

8. The handwriting tablet according to claim 7, It is characterized in that Also includes: a gate insulating layer, wherein the second metal line and the gate line are arranged in the gate insulating layer; and the gate insulating layer is provided with a third via hole connected to the second via hole; The positioning electrode extends and sequentially passes through the second via hole and the third via hole to be electrically connected to the second metal wire.

9. The handwriting tablet according to any one of claims 1 to 8, It is characterized in that The length of the erasing electrode is between 4 and 5 times the length of the positioning electrode.

10. A method for controlling a handwriting board, It is characterized in that The handwriting tablet according to any one of claims 1 to 9 comprises: The positioning electrodes collect touch operation signals; The erasing electrode located at the touch position is energized to control the liquid crystal molecules located on one side of the current erasing electrode to be in a scattering state.

11. A handwriting tablet substrate, It is characterized in that include: substrate substrate; A gate insulating layer located on one side of the base substrate, wherein a gate line and a second metal line are arranged in the gate insulating layer; A passivation layer located on a side of the gate insulation layer away from the base substrate, wherein a first metal line and a data line are arranged in the passivation layer; A plurality of first electrodes arranged in an array on a side of the passivation layer away from the gate insulating layer, each of the first electrodes comprising: a positioning electrode and an erasing electrode; The positioning electrode in each of the first electrodes is arranged in the same layer as the erasing electrode, the positioning electrode is arranged at a first corner of each of the first electrodes, and the erasing electrode is arranged around two sides of the positioning electrode away from the first corner.

12. A method for manufacturing a handwriting tablet substrate, It is characterized in that include: providing a substrate base plate; A gate insulating layer is manufactured on one side of the base substrate, wherein a gate line and a second metal line are arranged in the gate insulating layer; A passivation layer is formed on a side of the gate insulation layer away from the base substrate, wherein a first metal line and a data line are arranged in the passivation layer; A plurality of first electrodes arranged in an array are fabricated on a side of the passivation layer away from the gate insulating layer, each of the first electrodes comprising: a positioning electrode and an erasing electrode; The positioning electrode in each of the first electrodes is arranged in the same layer as the erasing electrode, the positioning electrode is arranged at a first corner of each of the first electrodes, and the erasing electrode is arranged around two sides of the positioning electrode away from the first corner.

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