Liquid crystal handwriting board, handwriting device and handwriting system

Abstract

A liquid crystal writing tablet (000), a handwriting device (001), and a handwriting system (111) are disclosed. The liquid crystal writing tablet (000) includes a first substrate (100) and a second substrate (200) disposed opposite to each other, and a liquid crystal layer (300) located between the first substrate (100) and the second substrate (200). The first substrate (100) includes a first substrate (101), and an electromagnetic touch layer (102) and a pixel electrode layer (103) located on one side of the first substrate (101). The electromagnetic touch layer (102) in the liquid crystal writing tablet (000) has electromagnetic signal lines (1021) connected in series, and the electromagnetic signal lines (1021) connected in series can form a coil structure (1021).

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a liquid crystal writing tablet, a handwriting device, and a handwriting system. Background Technology

[0002] A handwriting tablet is an electronic device used for writing and drawing. Among them, LCD handwriting tablets have the advantages of low power consumption and clear handwriting, and have gained a significant market share in recent years.

[0003] To enable partial erasure of handwriting displayed on an LCD handwriting tablet, an infrared positioning device needs to be integrated into the tablet. When using an erasing tool (e.g., a hard eraser) to erase the handwriting, the infrared positioning device can determine the tool's position on the tablet, thus identifying the area to be erased. The tablet can then control the pixel electrodes within that area to erase the handwriting.

[0004] However, integrating an infrared positioning device into an LCD handwriting tablet results in a larger overall thickness of the tablet. Summary of the Invention

[0005] This application provides a liquid crystal writing tablet, a handwriting device, and a handwriting system. It solves the problem of excessive thickness in existing liquid crystal writing tablets. The technical solution is as follows:

[0006] On one hand, a liquid crystal writing tablet is provided, comprising: a first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer located between the first substrate and the second substrate, the liquid crystal layer comprising bistable liquid crystal molecules; the first substrate comprises: a first substrate, and an electromagnetic touch layer and a pixel electrode layer located on one side of the first substrate, the electromagnetic touch layer having a plurality of electromagnetic signal lines, each of two adjacent electromagnetic signal lines being connected in series.

[0007] The second substrate includes: a second substrate and a common electrode layer located on one side of the second substrate.

[0008] Optionally, the first substrate further includes: a plurality of first connection structures and a plurality of second connection structures, wherein the plurality of first connection structures are distributed on one side of the plurality of electromagnetic signal lines, and the plurality of second connection structures are distributed on the other side of the plurality of electromagnetic signal lines;

[0009] Wherein, one end of the first electromagnetic signal line is electrically connected to one end of the second electromagnetic signal line through the first connection structure, and the other end is electrically connected to one end of the third electromagnetic signal line through the second connection structure. The first electromagnetic signal line is one of the plurality of electromagnetic signal lines, and the second electromagnetic signal line is one of the plurality of electromagnetic signal lines located on one side of the first electromagnetic signal line. The third electromagnetic signal line is one of the plurality of electromagnetic signal lines located on the side of the first electromagnetic signal line away from the second signal line.

[0010] Both the first connection structure and the second connection structure are switches.

[0011] Optionally, the first substrate further includes: multiple data lines and multiple gate lines, wherein the multiple electromagnetic signal lines in the electromagnetic touch layer are at least one of the multiple data lines and the multiple gate lines.

[0012] Optionally, the switch includes a first pole, a second pole, and a control pole, wherein the control pole is used to turn on the first pole and the second pole when a conduction signal is received;

[0013] Wherein, the first pole and the second pole are respectively electrically connected to the ends of the two electromagnetic signal lines;

[0014] The first substrate further includes: at least two switch control lines, wherein one of the at least two switch control lines is electrically connected to at least a portion of the control electrode of the first connection structure, and the other switch control line is electrically connected to at least a portion of the control electrode of the second connection structure;

[0015] When the at least two switch control lines open both the first connection structure and the second connection structure, the electromagnetic signal lines electrically connected to the first connection structure and the second connection structure are connected in series.

[0016] Optionally, the at least two switch control lines include N sets of switch control lines, where N is an integer greater than 1;

[0017] A set of the switch control lines includes: a switch control line for electrically connecting to the control electrode of at least a portion of the first connection structure, and a switch control line for electrically connecting to the control electrode of at least a portion of the second connection structure;

[0018] The control electrodes of adjacent first connection structures are electrically connected to different groups of switch control lines; the control electrodes of adjacent second connection structures are electrically connected to different groups of switch control lines.

[0019] Optionally, the liquid crystal handwriting tablet includes: N adjacent first connection structures and N adjacent second connection structures;

[0020] Among them, N adjacent first connection structures are electrically connected to different groups of switch control lines, and N adjacent second connection structures are electrically connected to different groups of switch control lines.

[0021] Optionally, in at least a portion of the LCD handwriting pad, N adjacent first connection structures are arranged at equal intervals, and N adjacent second connection structures are arranged at equal intervals.

[0022] Optionally, the at least two switch control lines include two switch control lines arranged on the same layer;

[0023] Of the two switch control lines, one switch control line is electrically connected to the control electrode of all the first connection structures, and the other switch control line is electrically connected to the control electrode of all the second connection structures.

[0024] Optionally, the electromagnetic touch layer is located on the side of the first substrate closer to the second substrate. The electromagnetic touch layer in the first substrate has two layers. The electromagnetic signal lines in one layer of the electromagnetic touch layer are the data lines, and the electromagnetic signal lines in the other layer of the electromagnetic touch layer are the gate lines. The data lines extend along a first direction, and the gate lines extend along a second direction. The first direction and the second direction are different.

[0025] The at least two switch control lines include: two first switch control lines and two second switch control lines, wherein the extension direction of the first switch control lines is the second direction, and the extension direction of the second switch control lines is the first direction.

[0026] Among the multiple data lines, the data line that serves as the electromagnetic signal line is a multiplexed data line; among the multiple gate lines, the gate line that serves as the electromagnetic signal line is a multiplexed gate line;

[0027] The plurality of data lines are arranged between two first switch control lines, and the first switch control lines are electrically connected to the control electrode of a switch used to connect two adjacent multiplexed data lines; the plurality of gate lines are arranged between two second switch control lines, and the second switch control lines are electrically connected to the control electrode of a switch used to connect two adjacent multiplexed gate lines.

[0028] Optionally, at least one of the multiplexed data line and the multiplexed gate line has: a plurality of electromagnetic enhancement portions and a plurality of connecting portions electrically connected to each other, wherein the plurality of electromagnetic enhancement portions and the plurality of connecting portions are arranged alternately.

[0029] Optionally, when the multiplexed data line has the plurality of electromagnetic enhancement portions and the plurality of connection portions, the orthographic projection of a portion of the gate line on the first substrate is located within the area enclosed by the orthographic projection of the electromagnetic enhancement portion of the multiplexed data line on the first substrate.

[0030] And / or, when the multiplexed gate line has the plurality of electromagnetic enhancement portions and the plurality of connection portions, the orthographic projection of a portion of the data line onto the first substrate lies within the area enclosed by the orthographic projection of the electromagnetic enhancement portion of the multiplexed gate line onto the first substrate.

[0031] Optionally, the electromagnetic enhancement part is a ring-shaped part or a U-shaped part.

[0032] Optionally, the first substrate has a plurality of sub-pixel regions arranged in an array;

[0033] At least one of the multiplexed data line and the multiplexed gate line has: a plurality of first extensions and a plurality of second extensions that are electrically connected to each other, the plurality of first extensions and the plurality of second extensions being arranged alternately with their ends grounded, and the extension direction of the first extensions intersecting the extension direction of the second extensions;

[0034] Wherein, any two adjacent first extensions and the second extension between the two adjacent first extensions form a bending structure, and the area enclosed by the bending structure partially surrounds at least a portion of the area within a sub-pixel region.

[0035] Optionally, the two electromagnetic touch layers are: a first electromagnetic touch layer and a second electromagnetic touch layer, both of which have two signal ports.

[0036] The two signal ports in the first electromagnetic touch layer are insulated from the two signal ports in the second electromagnetic touch layer, and the two signal ports in the first electromagnetic touch layer are both signal input ports, while the two signal ports in the second electromagnetic touch layer are both signal output ports.

[0037] Alternatively, the two signal ports in the first electromagnetic touch layer are electrically connected to the two signal ports in the second electromagnetic touch layer, and both the two signal ports in the first electromagnetic touch layer and the two signal ports in the second electromagnetic touch layer are signal output ports.

[0038] Optionally, when the two signal ports in the first electromagnetic touch layer are electrically connected to the two signal ports in the second electromagnetic touch layer respectively, the two ends of one first switch control line are electrically connected to one end of the two second switch control lines respectively, and the two ends of one second switch control line are electrically connected to one end of the two first switch control lines respectively.

[0039] Optionally, the data lines in at least a portion of the liquid crystal handwriting pad are all multiplexed data lines, and / or the gate lines in at least a portion of the liquid crystal handwriting pad are all multiplexed gate lines.

[0040] Optionally, the multiple electromagnetic signal lines are divided into two groups, the two groups of electromagnetic signal lines are arranged in different layers, and the two ends of one electromagnetic signal line in one group are respectively electrically connected to two electromagnetic signal lines in the other group.

[0041] The first substrate has multiple sub-pixel regions arranged in an array;

[0042] Each electromagnetic signal line comprises multiple signal segments connected in sequence. A portion of the signal segments is parallel to the row arrangement of the multiple sub-pixel regions, and another portion of the signal segments is parallel to the column arrangement of the multiple sub-pixel regions.

[0043] Wherein, after one end of one electromagnetic signal line in one group of electromagnetic signal lines is electrically connected to one end of one electromagnetic signal line in another group of electromagnetic signal lines, these two electromagnetic signal lines can form at least one sub-pixel region.

[0044] Optionally, one of the electromagnetic signal lines in a set of electromagnetic signal lines partially surrounds at least one of the sub-pixel regions.

[0045] Optionally, the first substrate further includes: multiple data lines and multiple gate lines, wherein the electromagnetic signal lines are disposed on a different layer from the data lines and on a different layer from the gate lines;

[0046] The electromagnetic touch layer is located on the side of the first substrate closer to the second substrate, the electromagnetic signal line has an insulating layer on the side away from the first substrate, and the pixel electrode layer is located on the side of the insulating layer away from the first substrate.

[0047] Alternatively, the electromagnetic touch layer is located on the side of the first substrate opposite to the second substrate.

[0048] Optionally, the first substrate further includes: a plurality of driving transistors, and the pixel electrode layer has a plurality of pixel electrodes electrically connected to the plurality of driving transistors in a one-to-one correspondence.

[0049] Optionally, the first substrate or the second substrate is a flexible substrate, and the flexible substrate is located on the writing side of the liquid crystal writing tablet.

[0050] On the other hand, a handwriting device is provided, comprising: any of the above-described liquid crystal handwriting tablets, and a control component electrically connected to the liquid crystal handwriting tablets;

[0051] The control component is configured to: when the LCD handwriting tablet is in erase mode, determine the position information of the area to be erased through the electromagnetic touch layer, and apply a pixel voltage to the pixel electrode in the area to be erased, so as to form a voltage difference between the pixel electrode in the area to be erased and the common electrode layer.

[0052] Optionally, the control component is configured to: when the LCD handwriting pad is in erase mode, acquire a first sensing signal output by the electromagnetic touch layer, and determine the position information of the area to be erased based on the first sensing signal and the correspondence between the touch position and the sensing signal recorded by the control component.

[0053] Optionally, the control component is configured to: when the LCD handwriting tablet is in writing mode, determine the position information of the writing strokes through the electromagnetic touch layer, and generate image information corresponding to the writing strokes;

[0054] The control component is further configured to: when the LCD handwriting tablet is in writing mode, acquire a second sensing signal output by the electromagnetic touch layer, and determine the position information of the writing strokes based on the second sensing signal and the correspondence.

[0055] Optionally, the handwriting device further includes a switch electrically connected to the control component, the switch being configured to control the liquid crystal handwriting tablet to switch between the erasing mode and the writing mode.

[0056] In another aspect, a handwriting system is provided, comprising: an erasing tool and any of the handwriting devices described above, wherein the erasing tool has a first coil structure.

[0057] Optionally, the handwriting system further includes a handwriting tool having a second coil structure.

[0058] The beneficial effects of the technical solutions provided in this application include at least the following:

[0059] A liquid crystal writing tablet includes: a first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer located between the two. Because the electromagnetic touch layer in the liquid crystal writing tablet has interconnected electromagnetic signal lines, and these interconnected electromagnetic signal lines can form a coil structure, this coil structure can cooperate with the first coil structure in the erasing tool or the second coil structure in the writing tool. This allows the control components in the writing device to determine the position information of the erasing tool or the writing tool on the liquid crystal writing tablet after the liquid crystal writing tablet is integrated into the writing device. In this way, the writing device can realize the function of partial erasing or saving of handwriting. Thus, this application eliminates the need for an infrared positioning device in the liquid crystal writing tablet; the electromagnetic touch layer integrated in the first substrate alone can realize the function of partial erasing or saving of handwriting, effectively reducing the overall thickness of the liquid crystal writing tablet and the width of its bezel, resulting in a higher screen-to-body ratio. Attached Figure Description

[0060] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0061] Figure 1 This is a top view of a liquid crystal handwriting tablet provided by related technologies;

[0062] Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the LCD handwriting tablet at point A-A'.

[0063] Figure 3 This is a schematic diagram of the structure of a liquid crystal handwriting tablet provided in an embodiment of this application;

[0064] Figure 4 This is a top view of an electromagnetic touch layer provided in an embodiment of this application;

[0065] Figure 5 This is a schematic diagram of the structure of a handwriting device provided in an embodiment of this application;

[0066] Figure 6 This is a top view of a first substrate provided in this application;

[0067] Figure 7 This is a top view of another first substrate provided in this application;

[0068] Figure 8 This is a top view of yet another first substrate provided in this application;

[0069] Figure 9 yes Figure 8 The diagram shows the structure at point A-A';

[0070] Figure 10 This is a schematic diagram of the timing signals loaded on the first switch opening control line and the second switch opening control line according to an embodiment of this application;

[0071] Figure 11 This is a top view of yet another first substrate provided in this application;

[0072] Figure 12 This is a top view of a gate line in a first substrate provided in this application;

[0073] Figure 13 This is a top view of data lines and gate lines in a first substrate provided in this application;

[0074] Figure 14 This is a top view of a data line in a first substrate provided in this application;

[0075] Figure 15 This is a top view of the data lines and gate lines in another first substrate provided in this application;

[0076] Figure 16 This is a top view of another first substrate provided in this application;

[0077] Figure 17 It is a kind of Figure 15 The diagram shows the membrane structure at point B-B'.

[0078] Figure 18 It is another kind Figure 16 The schematic diagram of the membrane structure at point B-B' is shown.

[0079] Figure 19 This is a schematic diagram of the structure of a handwriting system provided in an embodiment of this application;

[0080] Figure 20 This is a schematic diagram of another handwriting system provided in an embodiment of this application. Detailed Implementation

[0081] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0082] Please refer to the relevant technologies. Figure 1 and Figure 2 , Figure 1 This is a top view of a liquid crystal writing tablet provided by related technologies. Figure 2 yes Figure 1The diagram shows a cross-sectional view of the LCD handwriting tablet at point A-A'. The LCD handwriting tablet 00 typically includes: an LCD panel 01 and an infrared positioning device 02.

[0083] The liquid crystal panel 01 may include: a first substrate 011 and a second substrate 012 disposed opposite to each other, and a liquid crystal layer 013 located between the two. The first substrate 011 typically has a plurality of pixel electrodes (not shown in the figure) arranged in an array, the second substrate 012 has a planar common electrode 0121, and the liquid crystal molecules in the liquid crystal layer 013 may be bistable liquid crystal molecules.

[0084] The infrared positioning device 02 in the LCD handwriting tablet 00 is located around the periphery of the LCD panel 01, and is higher than the display surface of the LCD panel 01. The infrared positioning device 02 can emit infrared light so that the LCD handwriting tablet 00 can locate the position of external objects (e.g., handwriting tools or erasing tools) on the LCD handwriting tablet 00 through the infrared light emitted by the infrared positioning device 02.

[0085] When the LCD handwriting tablet 00 is in writing mode, a handwriting tool (e.g., a stylus) can apply pressure to the LCD panel 01, causing some liquid crystal molecules in the liquid crystal layer 013 of the LCD panel 01 to change from a focal conical texture to a planar texture under the action of external pressure. In this way, the liquid crystal molecules that have changed to a planar texture can reflect light of a certain wavelength (e.g., green light) from the incoming ambient light, allowing the LCD handwriting tablet 00 to display handwriting. Furthermore, during the writing process, the movement trajectory of the handwriting tool can be determined by the infrared positioning device 02 to ensure that the LCD handwriting tablet 00 can generate image information corresponding to the handwriting based on this movement trajectory. Subsequently, the LCD handwriting tablet 00 can send this image information to other display devices (e.g., a computer or mobile phone) so that other display devices can also display the handwriting on the LCD handwriting tablet 00.

[0086] When the LCD writing tablet 00 is in erase mode, an erasing tool (e.g., a flat eraser) moves on the LCD writing tablet 00. The LCD writing tablet 00 determines the position of the erasing tool on the LCD panel 01 using infrared light emitted by the infrared positioning device 02, thereby identifying the area to be erased within the LCD writing tablet 00. Then, the LCD writing tablet applies a voltage to the pixel electrodes in the area to be erased, creating a voltage difference between the pixel electrodes and the common electrode 0121. This causes the liquid crystal molecules in the area to be erased to rearrange under the influence of this voltage difference, transforming the liquid crystal molecules from a planar texture to a focal conical texture. This transformed focal conical texture allows the liquid crystal molecules to transmit ambient light, enabling the area to be erased to display a background color (e.g., black or dark green), thus erasing the written handwriting within the area.

[0087] However, when the infrared positioning device 02 is integrated into the LCD handwriting tablet 00, the infrared positioning device 02 needs to be higher than the display surface of the LCD panel 01 in order to ensure that the infrared positioning device 02 works normally, resulting in a larger thickness of the LCD handwriting tablet 00 and a lower screen ratio.

[0088] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a liquid crystal writing tablet provided in an embodiment of this application. The liquid crystal writing tablet 000 may include: a first substrate 100 and a second substrate 200 disposed opposite to each other, and a liquid crystal layer 300 located between the first substrate 100 and the second substrate 200, the liquid crystal layer 300 comprising bistable liquid crystal molecules. Here, the liquid crystal layer 300 is a bistable liquid crystal molecule layer.

[0089] The first substrate 100 in the liquid crystal handwriting tablet 000 may include: a first substrate 101, and an electromagnetic touch layer 102 and a pixel electrode layer 103 located on one side of the first substrate 101. For example, the electromagnetic touch layer 102 is closer to the first substrate 101 than the pixel electrode layer 103. Here, the pixel electrode layer 103 has a plurality of pixel electrodes 103a. Figure 3 (Not marked in the original text, but marked in the subsequent attached figures).

[0090] In this application, for a clearer view of the structure of the electromagnetic touch layer, please refer to... Figure 4 , Figure 4 This is a top view of an electromagnetic touch layer provided in an embodiment of this application. The electromagnetic touch layer 102 has multiple electromagnetic signal lines 1021, with each pair of adjacent electromagnetic signal lines 1021 connected in series. Here, each pair of adjacent electromagnetic signal lines 1021 are connected in series with each other, and the electromagnetic signal lines 1021 connected in series can form a coil structure, which can generate an electromagnetic field after an electromagnetic signal is applied to it.

[0091] The second substrate 200 may include a second substrate 201 and a common electrode layer 202 located on one side of the second substrate 201. Here, the common electrode layer 202 has a common electrode 2021.

[0092] In this application, either the first substrate 101 or the second substrate 201 can be a flexible substrate. The flexible substrate is located on the writing side of the liquid crystal writing tablet 000. Here, the writing side of the liquid crystal writing tablet 000 refers to the side of the liquid crystal writing tablet 000 where it is displayed. Thus, when a user applies pressure to the flexible substrate on the writing side of the liquid crystal writing tablet 000, the bistable liquid crystal molecules in the liquid crystal layer 300 change from a focal conic texture to a planar texture, thereby enabling the liquid crystal writing tablet 000 to display handwriting. For example, this embodiment uses the second substrate 201 as a flexible substrate for illustrative purposes.

[0093] In the embodiments of this application, when Figure 3 When the LCD handwriting pad shown is integrated into the handwriting device, please refer to... Figure 5 , Figure 5 This is a schematic diagram of a handwriting device provided in an embodiment of this application. The handwriting device 001 may include: a liquid crystal handwriting tablet 000 and a control component 010. The liquid crystal handwriting tablet 000 may be... Figure 3 The control component 010 of the illustrated LCD handwriting tablet can be electrically connected to the LCD handwriting tablet 000. Here, the control component can be electrically connected to the electromagnetic touch layer 102, pixel electrode layer 103, and common electrode layer 202 in the LCD handwriting tablet 000.

[0094] Thus, the control component 010 can be configured to: when the LCD handwriting tablet 000 is in the erasure mode, determine the position information of the area to be erased through the electromagnetic touch layer 102, and apply a pixel voltage to the pixel electrode 103a in the area to be erased, so that a voltage difference is formed between the pixel electrode 103a in the area to be erased and the common electrode layer 202.

[0095] In this embodiment of the application, the control component 010 can also be configured to: when the liquid crystal handwriting tablet 000 is in writing mode, the electromagnetic touch layer 102 can determine the position information of the writing strokes and generate image information corresponding to the writing strokes.

[0096] It should be noted that the handwriting device 001 may also include: a switch electrically connected to the control component 010. Figure 5 (Not shown in the image), the switch can be configured to control the LCD handwriting pad 000 to switch between erase mode and writing mode.

[0097] When the liquid crystal writing tablet is in writing mode, a writing tool (e.g., a stylus) can be used to write on the liquid crystal writing tablet 000. If the writing tool comes into contact with the second substrate 200 in the liquid crystal writing tablet 000 and a certain pressure is applied to the second substrate 200, some of the bistable liquid crystal molecules in the liquid crystal layer 300 of the liquid crystal writing tablet 000 will change from a focal conical texture to a planar texture under the action of external pressure. In this way, the planar textured bistable liquid crystal molecules can reflect light of a certain wavelength (e.g., green light) from the ambient light shining on the liquid crystal writing tablet 000, so that the liquid crystal writing tablet 000 can display the corresponding handwriting.

[0098] When the LCD handwriting tablet is in erase mode, the handwriting displayed on the LCD handwriting tablet 000 can be erased using an erasing tool (e.g., a board eraser). The erasing tool has a first coil structure. Since the electromagnetic touch layer 102 in the LCD handwriting tablet 000 has interconnected electromagnetic signal lines 1021, and these interconnected electromagnetic signal lines 1021 can form a coil structure, when an electromagnetic signal is applied to either this coil structure or the first coil structure of the erasing tool, the coil structure with the applied electromagnetic signal can generate an electromagnetic field. Thus, when the erasing tool contacts the second substrate 200 in the LCD handwriting tablet 000, the other coil structure (i.e., the coil structure without an applied electromagnetic signal) can generate an induced current under the influence of the electromagnetic field. The control component 010 in the handwriting device 001 can determine the position information of the erasing tool on the LCD handwriting tablet 000 based on this induced current; this position of the erasing tool on the LCD handwriting tablet 000 is the position of the area to be erased. Subsequently, the control component 010 can apply a voltage to the pixel electrode within the area to be erased based on the position information of the area to be erased, so that a voltage difference can be formed between the pixel electrode and the common electrode 2021 within the area to be erased. Under the action of this voltage difference, the liquid crystal molecules in the area to be erased in the liquid crystal writing pad 000 rearrange themselves, that is, the liquid crystal molecules can change from a planar texture to a focal cone texture, thereby enabling the handwriting device to erase writing marks in a local area.

[0099] If the handwriting tool has a second coil structure, the liquid crystal handwriting tablet 000 can also save the handwriting. Since the electromagnetic touch layer 102 in the liquid crystal handwriting tablet 000 has interconnected electromagnetic signal lines 1021, and these interconnected electromagnetic signal lines 1021 can form a coil structure, when an electromagnetic signal is applied to either this coil structure or the second coil structure of the handwriting tool, the coil structure with the applied electromagnetic signal can generate an electromagnetic field. Thus, when the handwriting tool comes into contact with the second substrate 200 in the liquid crystal handwriting tablet 000, the other coil structure (i.e., the coil structure without an applied electromagnetic signal) can generate an induced current under the influence of the electromagnetic field. The control component 010 in the handwriting device 001 can determine the position information of the handwriting tool on the liquid crystal handwriting tablet 000 based on this induced current. Thus, during the writing process using the handwriting tool, the control component 010 can determine the position information of the handwriting tool in contact with the second substrate 200 through the electromagnetic touch layer 102, thereby determining the position information of the writing strokes and generating image information corresponding to the writing strokes. This allows the handwriting device 001 to achieve the function of saving the writing strokes. Subsequently, the control component 010 can send the image information to other display devices (e.g., computers or mobile phones) so that other display devices can also display the writing strokes on the liquid crystal handwriting tablet 000.

[0100] In this embodiment, since the electromagnetic touch layer 102 in the liquid crystal handwriting tablet 000 can form a coil structure, it can cooperate with the first coil structure in the erasing tool or the second coil structure in the handwriting tool. This allows the control component 010 in the handwriting device 001 to determine the position information of the erasing tool or handwriting tool on the liquid crystal handwriting tablet 000 after the liquid crystal handwriting tablet 000 is integrated into the handwriting device 001. Therefore, the handwriting device can achieve partial erasure or preservation of handwriting. Thus, compared to the use of infrared positioning devices for erasing or preserving handwriting in related technologies, this application eliminates the need for an infrared positioning device in the liquid crystal handwriting tablet 000, effectively reducing the overall thickness of the liquid crystal handwriting tablet 000 and increasing its screen-to-body ratio.

[0101] In summary, the liquid crystal writing tablet provided in this application includes: a first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer located between the two. Since the electromagnetic touch layer in the liquid crystal writing tablet has interconnected electromagnetic signal lines, and these interconnected electromagnetic signal lines can form a coil structure, this coil structure can cooperate with the first coil structure in the erasing tool or the second coil structure in the writing tool. This allows the control components in the writing device to determine the position information of the erasing tool or the writing tool on the liquid crystal writing tablet after the liquid crystal writing tablet is integrated into the writing device. Thus, the writing device can achieve the function of partially erasing or saving handwriting. Therefore, this application does not require an infrared positioning device in the liquid crystal writing tablet; only the electromagnetic touch layer integrated in the first substrate is needed to achieve the function of partially erasing or saving handwriting, effectively reducing the overall thickness of the liquid crystal writing tablet and the width of its bezel, resulting in a higher screen-to-body ratio.

[0102] In this application embodiment, the electromagnetic touch layer 102 in the first substrate 100 has various structures. This application embodiment illustrates the following two optional implementation methods:

[0103] For the first optional implementation method, please refer to... Figure 6 , Figure 6 This is a top view of a first substrate provided in this application. The first substrate 100 in the liquid crystal handwriting tablet 000 may further include: a plurality of first connection structures 104 and a plurality of second connection structures 105, wherein the plurality of first connection structures 104 are distributed on one side of a plurality of electromagnetic signal lines 1021, and the plurality of second connection structures 105 are distributed on the other side of the plurality of electromagnetic signal lines 1021. Here, the liquid crystal handwriting tablet 000 has a display area 00a and a peripheral area 00b located around the display area 00a. The plurality of first connection structures 104 and the plurality of second connection structures 105 are all located within the peripheral area 00b of the liquid crystal handwriting tablet 000.

[0104] In this configuration, one end of the first electromagnetic signal line 1021a is electrically connected to one end of the second electromagnetic signal line 1021b via a first connecting structure 104, and the other end is electrically connected to one end of the third electromagnetic signal line 1021c via a second connecting structure 105. Here, the first electromagnetic signal line 1021a is any one of the multiple electromagnetic signal lines 1021, the second electromagnetic signal line 1021b is the electromagnetic signal line located on the side of the first electromagnetic signal line 1021a, and the third electromagnetic signal line 1021c is the electromagnetic signal line located on the side of the first electromagnetic signal line 1021a away from the second electromagnetic signal line 1021b. Both the first connecting structure 104 and the second connecting structure 105 are switches. Thus, when the switches are open, the multiple electromagnetic signal lines 1021 in the first substrate 100 can be connected in series through multiple first connecting structures 104 and multiple second connecting structures 105, allowing the interconnected electromagnetic signal lines 1021 to form a coil structure. When the switch is closed, the multiple electromagnetic signal lines 1021 in the first substrate 100 are not electrically connected and will not form a coil structure.

[0105] In this application, there are various ways to connect the multiple electromagnetic signal lines 1021 to the connection structure. This application embodiment only illustrates the following two optional connection methods as examples:

[0106] The first optional connection method, such as Figure 6 As shown, the first electromagnetic signal line 1021a, the second electromagnetic signal line 1021b, and the third electromagnetic signal line 1021c can be three adjacent electromagnetic signal lines 1021. In this way, any two adjacent electromagnetic signal lines 1021 can be connected in series by the first connecting structure 104 or the second connecting structure 105.

[0107] For the second optional connection method, please refer to [link / reference]. Figure 7 , Figure 7 This is a top view of a first substrate provided in this application. The first electromagnetic signal line 1021a, the second electromagnetic signal line 1021b, and the third electromagnetic signal line 1021c can be non-adjacent electromagnetic signal lines 1021. For example, at least one electromagnetic signal line 1021 is located between any two of the first electromagnetic signal lines 1021a, the second electromagnetic signal line 1021b, and the third electromagnetic signal line 1021c. In one possible implementation, such as... Figure 7As shown, the odd-numbered rows of electromagnetic signal lines 1021 in the plurality of electromagnetic signal lines 1021 can be connected in series with each other through the first connecting structure 104 and the second connecting structure 105, and / or, the even-numbered rows of electromagnetic signal lines 1021 in the plurality of electromagnetic signal lines 1021 can be connected in series with each other through the first connecting structure 104 and the second connecting structure 105. In other possible implementations, the first electromagnetic signal line 1021a, the second electromagnetic signal line 1021b, and the third electromagnetic signal line 1021c can also have other arrangements. This application embodiment does not limit this.

[0108] In the embodiments of this application, please refer to Figure 8 and Figure 9 , Figure 8 This is a top view of yet another first substrate provided in this application. Figure 9 yes Figure 8 The diagram shows the structure at point A-A'. The first substrate 100 in the liquid crystal handwriting tablet 000 may further include: multiple data lines 106 and multiple gate lines 107. The data lines 106 extend along a first direction, and the gate lines 107 extend along a second direction, which are different from each other. Here, the extension direction of the data lines 106 and the gate lines 107 refers to their overall extension direction. For example, the extension direction of the data lines 106 may be perpendicular to the extension direction of the gate lines 107. The multiple electromagnetic signal lines 1021 within the electromagnetic touch layer 102 are at least one of the multiple data lines 106 and the multiple gate lines 107.

[0109] In this configuration, the LCD handwriting tablet 000 does not require additional metal traces as electromagnetic signal lines 1021. The electromagnetic signal line 1021 can reuse at least one of multiple data lines 106 and multiple gate lines 107, simplifying the manufacturing process of the LCD handwriting tablet 000 and reducing manufacturing costs. Here, the data lines 106 and gate lines 107 are arranged in different layers. It should be noted that in the embodiments of this application, the arrangement of two conductive structures in different layers refers to the presence of an insulating layer between the two conductive layers containing these two conductive structures. For example, as follows: Figure 8 As shown, the conductive layer to which the multiple data lines 106 belong is not the same conductive layer as the conductive layer to which the gate line 107 belongs, and there is an insulating layer between the conductive layer to which the multiple data lines 106 belong and the conductive layer to which the gate line 107 belongs.

[0110] It should also be noted that, Figure 8This illustration uses the example where both data line 106 and gate line 107 are used as electromagnetic signal lines 1021. In this case, the electromagnetic touch layer 102 is located on the side of the first substrate 101 near the second substrate 200. The electromagnetic touch layer 102 within the first substrate 100 has two layers: one layer contains electromagnetic signal lines 1021 that are data lines 106, and the other layer contains electromagnetic signal lines 1021 that are gate lines 107. In other possible implementations, the electromagnetic touch layer 102 can also have only one layer, where the electromagnetic signal lines 1021 can be either gate lines 107 or data lines 106. This embodiment does not limit this.

[0111] In this embodiment, the switch may include a first electrode, a second electrode, and a control electrode. The control electrode is used to turn on the first and second electrodes when a conduction signal is received. Here, when a high-level voltage is applied to the control electrode, the first and second electrodes can be turned on to open the switch; when a low-level voltage is applied to the control electrode, the first and second electrodes can be de-conducted to close the switch. For example, the switch may be a thin-film transistor. In this case, the control electrode is the gate of the thin-film transistor, and the first and second electrodes are the source and drain of the thin-film transistor, respectively. In other possible implementations, the switch may also be a switching circuit composed of multiple thin-film transistors. This embodiment does not limit this. This application only illustrates the example of a switch being a thin-film transistor.

[0112] It should be noted that the thin-film transistor can be either a top-gate thin-film transistor or a bottom-gate thin-film transistor, and the embodiments of this application do not limit this. Figure 9 The thin-film transistor shown is an example of a bottom-gate thin-film transistor. It should also be noted that, for the convenience of describing the embodiments below, the switch will be collectively referred to as thin-film transistor T1.

[0113] The first and second poles of the switch are electrically connected to the ends of two adjacent electromagnetic signal lines 1021, respectively. The first substrate 100 may further include at least two switch control lines 108, wherein one switch control line 108 is at least partially electrically connected to the control electrode of the first connection structure 104, and the other switch control line 108 is electrically connected to at least partially the control electrode of the second connection structure 105. Here, at least two switch control lines 108 are electrically connected to the control electrodes of multiple switches. Thus, the LCD handwriting tablet 000 can turn on the first and second poles of the switches via multiple switch control lines 108, thereby turning on or off multiple electromagnetic signal lines 1021. It should be noted that the two switch control lines 108 can be electrically connected. Thus, the LCD handwriting tablet 000 can simultaneously control the two switch control lines 108 to turn on or off via a controller.

[0114] In the embodiments of this application, such as Figure 6 and Figure 7 As shown, when at least two switch control lines 108 open both the first connection structure 104 and the second connection structure 105, the electromagnetic signal lines 1021 electrically connected to the first connection structure 104 and the second connection structure 105 are connected in series. When at least two switch control lines 108 close both the first connection structure 104 and the second connection structure 105, the electromagnetic signal lines 1021 electrically connected to the first connection structure 104 and the second connection structure 105 are not electrically connected.

[0115] In this configuration, when at least two switch control lines 108 are loaded with a first level for turning on the switches, all switches are in the on state. Thus, multiple electromagnetic signal lines 1021 can be connected in series through the thin-film transistors T1, forming a coil structure. This coil structure can then be coordinated with the first coil structure within the erasing tool or the second coil structure within the writing tool to achieve the positioning function of the erasing tool or the writing tool.

[0116] When at least two switch control lines 108 are loaded with the second level for turning off the switches, each switch is in the off state, so there is no electrical connection between the electromagnetic signal lines 1021. This allows multiple data lines 106 and multiple gate lines 107 to function normally, enabling the erasure of handwriting displayed on the LCD handwriting pad 000.

[0117] In this embodiment, at least two switch control lines 108 may include N groups of switch control lines, where N is an integer greater than 1. Each group of switch control lines 108 may include: one switch control line 108 for electrical connection to the control electrode of at least a portion of the first connection structure 104, and one switch control line 108 for electrical connection to the control electrode of at least a portion of the second connection structure 105. The control electrodes of adjacent first connection structures 104 are electrically connected to different groups of switch control lines 108, and the control electrodes of adjacent second connection structures 105 are electrically connected to different groups of switch control lines 108.

[0118] In this application, as Figure 7 As shown, the LCD handwriting tablet 000 may include: N adjacent first connection structures 104 and N adjacent second connection structures 105.

[0119] In this configuration, N adjacent first connection structures 104 are electrically connected to different groups of switch control lines 108, and N adjacent second connection structures 105 are electrically connected to different groups of switch control lines 108. Thus, different groups of switch control lines 108 can control their corresponding electromagnetic signal lines 1021 through the connection structures. For example, when there are two groups of switch control lines 108 in the first substrate 100, one switch control line 108 in one group is electrically connected to the control electrode of the odd-numbered row of the first connection structure 104, and the other switch control line 108 is electrically connected to the control electrode of the odd-numbered row of the second connection structure 105. Similarly, in the other group of switch control lines 108, one switch control line 108 is electrically connected to the control electrode of the even-numbered row of the first connection structure 104, and the other switch control line 108 is electrically connected to the control electrode of the even-numbered row of the second connection structure 105. Thus, when a set of switch control lines 108 turns on both the first connection structure 104 and the second connection structure 105 in the odd-numbered rows, the electromagnetic signal lines 1021 in the odd-numbered rows are connected in series, allowing them to form a coil structure. When another set of switch control lines 108 turns on both the first connection structure 104 and the second connection structure 105 in the even-numbered rows, the electromagnetic signal lines 1021 in the even-numbered rows are connected in series, allowing them to form a coil structure. This allows multiple coil structures to be formed within the first substrate 100, and each coil structure has low resistance, which is more conducive to subsequent electromagnetic touch control.

[0120] In this embodiment, the N sets of switch control lines 108 can be electrically connected to the same controller, allowing the LCD handwriting tablet 000 to control each set of switch control lines 108 through a single controller. Alternatively, each of the N sets of switch control lines 108 can be electrically connected to a separate controller, allowing the LCD handwriting tablet 000 to control the corresponding set of switch control lines 108 through different controllers. For example, the LCD handwriting tablet 000 can adjust the resistance of the coil structure in the first substrate 100 through each controller. Thus, the LCD handwriting tablet 000 can adjust the positioning accuracy of subsequent electromagnetic touch by adjusting the resistance of the coil structure.

[0121] In this application, in at least a portion of the LCD handwriting tablet 000, N adjacent first connection structures 104 are arranged at equal intervals, and N adjacent second connection structures 105 are arranged at equal intervals.

[0122] It should be noted that, in Figure 7 In the illustrated case, the electromagnetic signal lines 1021 in the even-numbered rows can form a coil structure with two signal ports. The electromagnetic signal lines 1021 in the odd-numbered rows can also form a coil structure with two signal ports. These signal ports can be used partly as signal input ports and partly as signal output ports. For example, the signal ports of the coil structure formed by the even-numbered rows of electromagnetic signal lines 1021 can be used as signal input ports, and the signal ports of the coil structure formed by the odd-numbered rows of electromagnetic signal lines 1021 can be used as signal output ports. Thus, the LCD handwriting tablet 000 can determine the position information of the erasing tool or handwriting tool on the LCD handwriting tablet 000 using the first method in the following embodiments.

[0123] In the embodiments of this application, such as Figure 6 As shown, at least two switch control lines 108 may include two switch control lines 108 arranged on the same layer. Of the two switch control lines 108, one switch control line 108 is electrically connected to the control electrode of all first connection structures 104, and the other switch control line 108 is electrically connected to the control electrode of all second connection structures 105. In this way, this set of switch control lines 108 can control all connection structures in the display panel, so that each electromagnetic signal line 1021 forms a coil structure.

[0124] It should be noted that the data line 1021 serving as an electromagnetic signal line among the multiple data lines 106 can be called a multiplexed data line, and the gate line 107 serving as an electromagnetic signal line 1021 among the multiple gate lines 107 can be called a multiplexed gate line. Here, a multiplexed data line refers to a data line among the multiple data lines 106 that can both form a coil structure as an electromagnetic signal line 1021 and function as a data line 106 for erasing operations on the LCD handwriting tablet 000. A multiplexed gate line refers to a gate line among the multiple gate lines 107 that can both form a coil structure as an electromagnetic signal line 1021 and function as a gate line 107 for erasing operations on the LCD handwriting tablet 000. Here, the data lines 106 in at least a portion of the LCD handwriting tablet 000 are all multiplexed data lines, and / or, the gate lines 107 in at least a portion of the LCD handwriting tablet 000 are all multiplexed gate lines. For example, multiple multiplexed data lines and multiple multiplexed gate lines are evenly distributed within display area 00a.

[0125] It should also be noted that the embodiments of this application are illustrated by taking as an example that all data lines 106 in the first substrate 100 are multiplexed data lines and all gate lines 107 are multiplexed gate lines. In other possible implementations, some data lines 106 in the first substrate 100 may be multiplexed data lines, and / or some gate lines 107 in the first substrate 100 may be multiplexed gate lines. The embodiments of this application do not limit this.

[0126] In this application, as Figure 8 As shown, at least two switch control lines 108 in the first substrate 100 may include two first switch control lines 1081 and two second switch control lines 1082. The extension direction of the first switch control lines 1081 is a second direction, that is, parallel to the extension direction of the gate line 107. The extension direction of the second switch control lines 1082 is a first direction, that is, parallel to the extension direction of the data line 106.

[0127] Multiple data lines 106 are arranged between two first switch control lines 1081, and the first switch control lines 1081 are electrically connected to the control electrode of a switch used to connect two adjacent multiplexed data lines; multiple gate lines 107 are arranged between two second switch control lines 1082, and the second switch control lines 1082 are electrically connected to the control electrode of a switch used to connect two adjacent multiplexed gate lines. Thus, the electromagnetic touch layer 102, where the electromagnetic signal line 1021 is the data line, can be controlled to operate via the two first switch control lines 1081; and the electromagnetic touch layer 102, where the electromagnetic signal line 1021 is the gate line, can be controlled to operate via the two second switch control lines 1082.

[0128] In this embodiment, the two electromagnetic touch layers 102 in the liquid crystal handwriting tablet 000 are a first electromagnetic touch layer and a second electromagnetic touch layer. It should be noted that, for ease of description below, the first electromagnetic touch layer is defined as the layer where the electromagnetic signal line 1021 is the gate line, and the second electromagnetic touch layer is defined as the layer where the electromagnetic signal line 1021 is the data line. In possible implementations, the first and second electromagnetic touch layers can be interchanged, and this embodiment does not limit this.

[0129] After integrating the LCD handwriting tablet 000 into the handwriting device 001, the handwriting device 001 can cooperate with the first coil structure within the erasing tool to position the erasing tool, or cooperate with the second coil structure within the handwriting tool to position the handwriting tool. When positioning the erasing tool or handwriting tool is required, the electromagnetic signal lines 1021 within the first electromagnetic touch layer need to be connected in series to form a coil structure within the first electromagnetic touch layer, and the electromagnetic signal lines 1021 within the second electromagnetic touch layer need to be connected in series to form a coil structure within the second electromagnetic touch layer. Furthermore, electromagnetic signals need to be applied to the first or second electromagnetic touch layer, or induction signals need to be received through the first and / or second electromagnetic touch layers.

[0130] Therefore, both the first and second electromagnetic touch layers have two signal ports. These signal ports can be used partly as signal input ports and partly as signal output ports, or both simultaneously as signal output ports. Therefore, embodiments of this application provide the following two methods for determining the position information of an erasing tool or handwriting tool on the liquid crystal handwriting pad 000:

[0131] In the first method, the two signal ports (A1, A2) in the first electromagnetic touch layer are insulated from the two signal ports (B1, B2) in the second electromagnetic touch layer, and the two signal ports (A1, A2) in the first electromagnetic touch layer are both signal input ports, while the two signal ports (B1, B2) in the second electromagnetic touch layer are both signal output ports.

[0132] In this configuration, neither the first coil structure of the erasing tool nor the second coil structure of the writing tool are connected to electromagnetic signals. That is, both the erasing and writing tools are passively driven, and neither the first nor second coil structure actively generates an electromagnetic field. By simultaneously connecting two signal ports (A1, A2) within the first electromagnetic touch layer to electromagnetic signals, the coil structure within the first electromagnetic touch layer can generate an electromagnetic field. When the LCD handwriting pad 000 is in erase mode and the erasing tool moves on the LCD handwriting pad 000, an induced current can be generated within the first coil structure of the erasing tool, thereby generating a new electromagnetic field. Under the influence of this new electromagnetic field, the coil structure within the second electromagnetic touch layer can generate an induced signal, which is output through the two signal ports (B1, B2) within the second electromagnetic touch layer. The subsequent control component 010 can determine the position information of the erasing tool on the LCD handwriting pad based on the induced signals output from the two signal ports (B1, B2) within the second electromagnetic touch layer. It should be noted that, for ease of explanation, the embodiments of this application are illustrated using the example of determining the position information of the erasing tool. The method for determining the position information of the writing tool is basically the same as that for determining the position information of the erasing tool, and will not be repeated here.

[0133] For example, please refer to Figure 10 , Figure 10 This is a schematic diagram of the timing signals loaded on the first switch on control line and the second switch on control line according to an embodiment of this application. Here, the handwriting device 001 can simultaneously apply a second scan signal to the two second switch on control lines 1082 and simultaneously apply a first scan signal to the two first switch on control lines 1081. When the liquid crystal handwriting tablet 000 is in erase mode, the first scan signal and the second scan signal applied by the handwriting device 001 can be applied in two stages: a positioning stage P1 and an erasure stage P2.

[0134] In the positioning phase P1, both the first and second scanning signals are periodic signals composed of multiple overlapping first and second level signals, with one of them being a first level and the other a second level. That is, when the first scanning signal is at the first level, the second scanning signal is at the second level; and when the first scanning signal is at the second level, the second scanning signal is at the first level. Here, when both the second and first scanning signals are at the first and second levels, a coil structure can be formed in the first electromagnetic touch layer, but not in the second electromagnetic touch layer. Electromagnetic signals need to be simultaneously input to both signal ports (A1, A2) of the first electromagnetic touch layer; this phase can be called the driving phase H1. When both the second and first scanning signals are at the second and first levels, a coil structure cannot be formed in the first electromagnetic touch layer, but it can be formed in the second electromagnetic touch layer. Induction signals need to be simultaneously received through both signal ports (B1, B2) of the second electromagnetic touch layer; this phase can be called the induction phase H2. Thus, within the positioning phase P1, by setting up multiple alternating driving phases H1 and multiple sensing phases H2, the position of the erasing tool can be located.

[0135] During the erasure phase P2, both the first and second scan signals are constant signals; for example, both the first and second scan signals are at the second level. This ensures that all switches are in the off state, allowing multiple data lines 106 and multiple gate lines 107 to function normally. Subsequently, during the erasure phase P2, by controlling the multiple data lines 106 and multiple gate lines 107, partial erasure of the writing marks in the area in contact with the erasure tool can be achieved.

[0136] It should be noted that the first level and the second level only represent that the signal level has two states, and do not mean that the first level or the second level has a specific value throughout the text. For example, when the thin-film transistors T1 are all N-type switching transistors, the first level can represent a high level, and the second level can represent a low level. Here, the N-type switching transistor is turned on when the gate is high and turned off when the gate is low.

[0137] In this scenario, when the LCD handwriting tablet 000 is in erase mode and a passively driven eraser is used, firstly, during the driving phase H1 of the positioning phase P1, the handwriting device 001 loads a first level second scan signal onto the two second switch control lines 1082, and a second level first scan signal onto the two first switch control lines 1081. This allows multiple multiplexed gate lines within the first electromagnetic touch layer to be connected in series to form a coil structure, while multiple multiplexed data lines within the second electromagnetic touch layer are not connected in series. Simultaneously, electromagnetic signals are input to the two signal ports (A1, A2) within the first electromagnetic touch layer, causing the coil structure within the first electromagnetic touch layer to generate an electromagnetic field. Subsequently, when the eraser moves on the LCD handwriting tablet, an induced current is generated within the first coil structure of the eraser, and this first coil structure generates a new electromagnetic field. Then, in the sensing stage H2 of the positioning stage P1, the handwriting device 001 loads a second scan signal at a second level onto the two second switch control lines 1082, and a first scan signal at a first level onto the two first switch control lines 1081. In this way, multiple multiplexed data lines in the second electromagnetic touch layer can be connected in series to form a coil structure, while multiple multiplexed gate lines in the first electromagnetic touch layer will not be connected in series. Thus, under the influence of the new electromagnetic field generated in the first coil structure of the erasing tool, this coil structure generates an induction signal, which is output through two signal ports (B1, B2) in the second electromagnetic touch layer. The subsequent control component 010 can determine the position information of the erasing tool on the LCD handwriting pad 000 based on the induction signals output from the two signal ports (B1, B2) in the second electromagnetic touch layer.

[0138] In this embodiment, after the liquid crystal handwriting tablet 000 determines the position information of the erasing tool, during the erasing stage P2, the first scan signal loaded by the handwriting device 001 onto the two first switch control lines 1081 is at a second level, and the second scan signal loaded onto the two second switch control lines 1082 is at a second level. That is, there is no electrical connection between the electromagnetic signal lines 1021 in the liquid crystal handwriting tablet 000, and the multiple data lines 106 and multiple gate lines 107 can work normally. In this way, the control component 010 can apply voltage to the pixel electrode in the area to be erased according to the position information of the area to be erased, so that the writing in the area to be erased is erased.

[0139] In this application, after the LCD handwriting tablet 000 determines the position information of the erasing tool, the LCD handwriting tablet 000 ensures relatively accurate position information of the erasing tool on the LCD handwriting tablet 000 by setting multiple alternately distributed driving stages H1 and multiple sensing stages H2 within the potential stage P1. Correspondingly, when the LCD handwriting tablet 000 is in writing mode, the position information of the writing tool on the LCD handwriting tablet 000 can also be determined relatively accurately. Subsequently, the control component 010 can generate better image information corresponding to the writing based on the detailed position information of the writing.

[0140] It should be noted that the LCD handwriting tablet 000 can first record the sensing signals output by the second electromagnetic touch layer at various locations within the LCD handwriting tablet 000 using a standard passively driven auxiliary tool with a coil structure (e.g., a stylus or eraser). That is, the correspondence between the position of the auxiliary tool on the LCD handwriting tablet 000 and the sensing signal generated at that position can be obtained. Here, the standard passively driven auxiliary tool with a coil structure refers to a reference tool suitable for the LCD handwriting tablet 000 to operate through the electromagnetic touch layer. Thus, when the erasing tool or writing tool moves on the LCD handwriting tablet 000, the LCD handwriting tablet 000 can determine the position information of the erasing tool or writing tool on the LCD handwriting tablet 000 based on the sensing signals output by the two signal ports (B1, B2) within the second electromagnetic touch layer and the previously determined correspondence.

[0141] It should also be noted that the portion of the first substrate 100 located within the peripheral region 00b further includes a bonding region. The bonding region has multiple gate line driving units F1 and multiple data line driving units F2. The gate line driving units F1 are used to bond with the gate line driving chip. Thus, the LCD handwriting tablet 000 can apply electrical signals to multiple gate lines 107 via the gate line driving units F1. The data line driving units F2 are used to bond with the data line driving chip. Thus, the LCD handwriting tablet 000 can apply electrical signals to multiple data lines 106 via the data line driving units F2. Here, the two signal ports (A1, A2) within the first electromagnetic touch layer can be electrically connected to the gate line driving units F1, enabling the LCD handwriting tablet 000 to apply electromagnetic signals to the signal ports (A1, A2) via the gate line driving units F1. The two signal ports (B1, B2) in the second electromagnetic touch layer can be electrically connected to the data line driving unit F2, so that the LCD handwriting tablet 000 can apply electromagnetic signals to the signal ports (B1, B2) through the data line driving unit F2.

[0142] For the second method, please refer to... Figure 11 , Figure 11This is a top view of another first substrate provided in this application. Two signal ports (A1, A2) in the first electromagnetic touch layer are electrically connected to two signal ports (B1, B2) in the second electromagnetic touch layer, and both the two signal ports (A1, A2) in the first electromagnetic touch layer and the two signal ports (B1, B2) in the second electromagnetic touch layer are signal output ports.

[0143] In this configuration, both the first coil structure of the erasing tool and the second coil structure of the writing tool are connected to electromagnetic signals. That is, both the erasing and writing tools are actively driven, and the first and second coil structures actively generate electromagnetic fields. The handwriting device 001 loads a first level second scan signal onto the two second switch control lines 1082 and a first level first scan signal onto the two first switch control lines 1081, connecting multiple multiplexed gate lines in the first electromagnetic touch layer and multiple multiplexed data lines in the second electromagnetic touch layer in series to form a coil structure. When the erasing tool moves on the LCD handwriting pad, the electromagnetic field generated by the first coil structure of the erasing tool induces a signal within this coil structure. This induced signal is output through signal ports (A1, B1) and signal ports (A2, B2). The subsequent control component 010 can determine the position information of the erasing tool on the LCD handwriting pad based on the induced signals output from these two signal ports (A1, B1) and signal ports (A2, B2). It should be noted that, for ease of explanation, the embodiments of this application are illustrated by taking the determination of the position information of the erasing tool as an example. The method for determining the position information of the writing tool is basically the same as the method for determining the position information of the erasing tool, and will not be repeated here.

[0144] In this application, when multiple multiplexed gate lines in the first electromagnetic touch layer and multiple multiplexed data lines in the second electromagnetic touch layer are connected in series, the coil structure formed in the liquid crystal writing tablet 000 is a three-dimensional coil. Thus, when the erasing tool moves on the liquid crystal writing tablet, the electromagnetic field generated by the first coil structure of the erasing tool allows for a larger induced current within this three-dimensional coil structure, resulting in stronger induced signals output from signal ports (A1, B1) and (A2, B2). This makes the position information of the erasing tool on the liquid crystal writing tablet 000 determined by the subsequent control component 010 more accurate, thereby improving the local erasing effect of the liquid crystal writing tablet 000. Correspondingly, when the liquid crystal writing tablet 000 is in writing mode, the position information of the writing tool on the liquid crystal writing tablet 000 can also be determined more accurately, resulting in better preservation of handwriting by the liquid crystal writing tablet 000.

[0145] In this embodiment, after the liquid crystal handwriting tablet 000 determines the position information of the erasing tool, the handwriting device 001 loads a first scan signal at a second level onto the two first switch control lines 1081, and a second scan signal at a second level onto the two second switch control lines 1082. That is, the electromagnetic signal lines 1021 in the liquid crystal handwriting tablet 000 are not electrically connected, and the multiple data lines 106 and multiple gate lines 107 can operate normally. Thus, the control component 010 can apply voltage to the pixel electrodes within the area to be erased based on the position information of the area to be erased, so that the writing in the area is erased.

[0146] It should be noted that the LCD handwriting tablet 000 can first record the sensing signals output by the first and second electromagnetic touch layers at various locations on the LCD handwriting tablet 000 using a standard actively driven auxiliary tool with a coil structure (e.g., a stylus or eraser). That is, the correspondence between the position of the auxiliary tool on the LCD handwriting tablet 000 and the sensing signal generated at that position can be obtained. Here, the standard actively driven auxiliary tool with a coil structure refers to a reference tool that conforms to the operation of the LCD handwriting tablet 000 through the electromagnetic touch layer. Thus, when the erasing tool or writing tool moves on the LCD handwriting tablet 000, the LCD handwriting tablet 000 can determine the position information of the erasing tool or writing tool on the LCD handwriting tablet 000 based on the sensing signals output from the two signal ports (A1, B1) and (A2, B2) and the previously determined correspondence.

[0147] In the embodiments of this application, such as Figure 11 As shown, when the two signal ports (A1, A2) in the first electromagnetic touch layer are electrically connected to the two signal ports (B1, B2) in the second electromagnetic touch layer, in one possible implementation, both ends of a first switch control line 1081 are electrically connected to one end of two second switch control lines 1082, and both ends of a second switch control line 1082 are electrically connected to one end of two first switch control lines 1081. In this way, the LCD handwriting tablet 000 can simultaneously apply electrical signals to the two second switch control lines 1082 and the two first switch control lines 1081 in the first substrate 100 through a single power port. This simplifies the circuitry of the multiple switch control lines 108 in the first substrate 100.

[0148] In another possible implementation, one end of a first switch control line 1081 is electrically connected to the end of an adjacent second switch control line 1082 closest to the first switch control line 1081, while the other end of the first switch control line 1081 is not electrically connected to the second switch control line 1082. In this way, the LCD handwriting tablet 000 can simultaneously apply electrical signals to one second switch control line 1082 and one first switch control line 1081 in the first substrate 100 through a single power port. This simplifies the circuitry of the multiple switch control lines 108 in the first substrate 100.

[0149] It should be noted that the first switch control line 1081 and the second switch control line 1082 may not be connected as shown in the diagram. Figure 11 The closed ring shown can have multiple openings. These openings can be electrically connected to control components in the handwriting device. Thus, the control components can apply voltage to the first switch control line 1081 and the second switch control line 1082 in the first substrate 100 through these openings. This ensures that both switches electrically connected to the first switch control line 1081 and the second switch control line 1082 can be turned on.

[0150] It should also be noted that after the LCD handwriting tablet 000 determines the position information of the erasing tool, the voltage applied to the pixel electrodes in the LCD handwriting tablet 000 is usually relatively large. Thus, during the process of the LCD handwriting tablet 000 determining the position information of the erasing tool, although voltages are applied to the two second switch control lines 1082 and the two first switch control lines 1081, the multiple array-arranged driving thin-film transistors connected to the gate line 107 and data line 106 in the LCD handwriting tablet 000 will not be turned on. This ensures that the handwriting displayed on the LCD handwriting tablet 000 will not be affected during the positioning process using multiplexed gate lines and multiplexed data lines.

[0151] Regarding the two methods for determining the position information of the erasing tool or handwriting tool on the liquid crystal handwriting tablet 000, there are various routing options for the multiplexed gate lines and multiplexed data lines in the first substrate 100. This embodiment will illustrate these options using the following two routing options as examples:

[0152] For the first optional routing option, please refer to [link / reference]. Figure 12 and Figure 13 , Figure 12 This is a top view of a gate line in a first substrate provided in this application. Figure 13 This is a top view of a data line and a gate line in a first substrate provided in this application. At least one of the multiplexed data line and the multiplexed gate line has: a plurality of electromagnetic enhancement portions O and a plurality of connecting portions L that are electrically connected to each other, and the plurality of electromagnetic enhancement portions O and the plurality of connecting portions L are arranged alternately.

[0153] In this embodiment, the electromagnetic enhancement portion O can be a ring-shaped portion or a U-shaped portion. Here, Figure 12 This explanation will take the case where the electromagnetic reinforcement part O is a ring-shaped part as an example. It should be noted that... Figure 12 The example described uses a multiplexed grid line composed of multiple ring-shaped electromagnetic enhancement sections O and multiple connecting sections L. In other possible implementations, the multiplexed data line is composed of multiple ring-shaped electromagnetic enhancement sections O and multiple connecting sections L, or both the multiplexed data line and the multiplexed grid line can have multiple ring-shaped electromagnetic enhancement sections O and multiple connecting sections L. This application does not limit this aspect.

[0154] In this application, since the multiple multiplexed gate lines 107 in the first electromagnetic touch layer have multiple electromagnetic enhancement portions O and multiple connection portions L, the coil structure formed by the multiple multiplexed gate lines 107 in the first electromagnetic touch layer can generate a stronger electromagnetic field, or this coil structure can generate a larger induced current.

[0155] For example, when the LCD handwriting pad 000 uses the first method to determine the position information of the erasing tool or handwriting tool on the LCD handwriting pad 000, during the driving stage H1 in the positioning stage P1, the passively driven erasing tool or passively driven handwriting tool moves on the LCD handwriting pad. Because the multiple multiplexed gate lines in the first electromagnetic touch layer have multiple electromagnetic enhancement parts O and multiple connection parts L, the electromagnetic field generated by the coil structure in the first electromagnetic touch layer is stronger. This results in a larger induced current generated by the first coil structure in the erasing tool or the second coil structure in the handwriting tool, further strengthening the new electromagnetic field generated by the coil structure in the erasing tool or handwriting tool. Thus, during the sensing stage H2 in the positioning stage P1, the multiple multiplexed data lines in the second electromagnetic touch layer generate a stronger induced signal under the influence of this new electromagnetic field. This makes the position information of the erasing tool or handwriting tool on the LCD handwriting pad 000 more accurate.

[0156] In this application, when the multiplexed data line has multiple electromagnetic enhancement portions O and multiple connection portions L, the orthographic projection of a portion of the gate line 107 on the first substrate 101 is located within the area enclosed by the orthographic projection of the electromagnetic enhancement portion O of the multiplexed data line on the first substrate 101.

[0157] And / or, when the multiplexed gate line has multiple electromagnetic enhancement portions O and multiple connection portions L, the orthographic projection of a portion of the data line 106 onto the first substrate 101 lies within the region enclosed by the orthographic projection of the electromagnetic enhancement portions O of the multiplexed gate line onto the first substrate 101. Here, Figure 13 Therefore, the multiplexed grid line has multiple electromagnetic enhancement parts O and multiple connection parts L, and the multiplexed data line is... Figure 8The arrangement shown is illustrated as an example. It should be noted that when the electromagnetic enhancement section O is U-shaped, the length of the U-shaped section in the first direction is greater than half the distance between two adjacent multiplexed grid lines. This ensures that the coil structure formed by the multiplexed grid lines with U-shaped sections can generate a stronger electromagnetic field, or that this coil structure can generate a larger induced current.

[0158] In this configuration, the overlap area between the orthographic projections of the multiplexed data lines and the orthographic projections of the multiplexed gate lines on the first substrate 101 is small. Consequently, the parasitic capacitance generated by the multiplexed data lines and multiplexed gate lines in the liquid crystal writing tablet 000 is small. Therefore, after the liquid crystal writing tablet 000 determines the position information of the erasing tool, because the parasitic capacitance generated by the multiplexed data lines and multiplexed gate lines in the liquid crystal writing tablet 000 is small, the voltage applied by the control component 010 to the pixel electrodes in the area to be erased through multiple multiplexed data lines and multiple multiplexed gate lines is less affected by the parasitic capacitance, resulting in better local erasing performance of the liquid crystal writing tablet 000.

[0159] For the second optional routing option, please refer to [link / reference]. Figure 14 and Figure 15 , Figure 14 This is a top view of a data line in a first substrate provided in this application. Figure 15 This is a top view of data lines and gate lines in another first substrate provided in this application. The first substrate 100 has a plurality of sub-pixel regions 100a arranged in an array. For example, any two adjacent gate lines 107 and any two adjacent data lines 106 can form a sub-pixel region.

[0160] At least one of the multiplexed data line 106 and the multiplexed gate line 107 has a plurality of first extensions Y1 and a plurality of second extensions Y2 that are electrically connected to each other. The plurality of first extensions Y1 and the plurality of second extensions Y2 are arranged alternately with their ends grounded, and the extension directions of the first extensions Y1 and the second extensions Y2 intersect each other. Here, the extension direction of the first extensions Y1 is perpendicular to the extension direction of the gate line 107, and the extension direction of the second extensions Y2 is parallel to the extension direction of the gate line 107.

[0161] In this configuration, any two adjacent first extensions Y1 and the second extension Y2 between any two adjacent first extensions Y1 on the same signal line (multiplexed data line 106 or multiplexed gate line 107) form a bent structure. The area enclosed by the bent structure semi-encloses at least a portion of a sub-pixel region 100a. Here, the bent structure forms a semi-enclosed area along the three end-to-end connecting sides of the sub-pixel region 100a. Figure 15 Therefore, the multiplexed data line has multiple first extensions Y1 and multiple second extensions Y2, and the multiplexed gate line is Figure 8The arrangement shown is illustrated as an example. In other possible implementations, the multiplexed gate line may have multiple first extensions Y1 and multiple second extensions Y2, or both the multiplexed data line and the multiplexed gate line may have multiple first extensions Y1 and multiple second extensions Y2. This application does not limit this aspect.

[0162] In the embodiments of this application, such as Figure 15 As shown, because the multiple multiplexed data lines within the second electromagnetic touch layer have a bent structure, the coil structure formed by these multiple multiplexed data lines can generate a stronger electromagnetic field, or this coil structure can generate a larger induced current.

[0163] For example, when the LCD handwriting pad 000 uses the first method to determine the position information of the erasing tool or handwriting tool on the LCD handwriting pad 000, during the driving stage H1 in the positioning stage P1, the passively driven erasing tool or passively driven handwriting tool moves on the LCD handwriting pad. The electromagnetic field generated by the coil structure in the first electromagnetic touch layer causes the induced current generated by the first coil structure in the erasing tool or the second coil structure in the handwriting tool, which in turn causes a new electromagnetic field generated by the coil structure in the erasing tool or handwriting tool. Thus, during the sensing stage H2 in the positioning stage P1, because the multiple multiplexed data lines in the second electromagnetic touch layer have multiple bending structures, the coil structure in the second electromagnetic touch layer generates a stronger induced signal under the action of this new electromagnetic field. This makes the position information of the erasing tool or handwriting tool on the LCD handwriting pad 000 more accurate.

[0164] For the second optional implementation method, please refer to... Figure 16 and Figure 17 , Figure 16 This is a top view of another first substrate provided in this application. Figure 17 It is a kind of Figure 16 The diagram shows the film structure at point B-B'. The multiple electromagnetic signal lines 1021 in the electromagnetic touch layer 102 are divided into two groups, which are arranged in different layers. The two ends of one electromagnetic signal line 1021 in one group 1021d are electrically connected to two electromagnetic signal lines 1021 in the other group 1021e. Here, the two ends of one electromagnetic signal line 1021 in one group 1021d are electrically connected to two electromagnetic signal lines 1021 in the other group 1021e through a via V. In this way, the two groups of electromagnetic signal lines 1021 in the electromagnetic touch layer 102 can be connected in series to form a coil structure.

[0165] For example, the first substrate 100 has a plurality of sub-pixel regions 100a arranged in an array. Each electromagnetic signal line 1021 comprises a plurality of signal segments connected in series. A portion of these signal segments J1 is parallel to the row arrangement of the plurality of sub-pixel regions 100a, while another portion J2 is parallel to the column arrangement of the plurality of sub-pixel regions 100a. Here, a sub-pixel region 100a can be a minimum erasure region.

[0166] In this application embodiment, there are multiple ways to arrange the electromagnetic signal lines. This application embodiment only uses the following two optional arrangement methods as examples for illustrative purposes:

[0167] In the first optional arrangement, one end of one electromagnetic signal line 1021 in one set of electromagnetic signal lines 1021d is electrically connected to one end of one electromagnetic signal line 1021 in another set of electromagnetic signal lines 1021e. These two electromagnetic signal lines 1021 can then form at least one sub-pixel region 100a. Here, the smaller the region formed by these two electromagnetic signal lines 1021, the better the positioning accuracy of the liquid crystal handwriting tablet 000 through the electromagnetic touch layer. In this application, Figure 16 This illustrates the case where the two electromagnetic signal lines 1021 can form a sub-pixel region 100a.

[0168] In a second optional arrangement, one electromagnetic signal line 1021 within one set of electromagnetic signal lines (1021d, 1021e) partially encloses at least one sub-pixel region 100a. Here, the electromagnetic signal line 102 has at least one bent structure, and the area enclosed by the bent structure partially encloses at least one sub-pixel region 100a. The bent structure can form the partially enclosed area along three end-to-end sides of the sub-pixel region 100a.

[0169] In this application, the sensing method for determining the position information of the erasing tool or writing tool on the liquid crystal writing tablet 000 can refer to the second method described above, and will not be repeated in this embodiment. It should be noted that when the two sets of electromagnetic signal lines 1021 in the electromagnetic touch layer 102 are connected in series, the coil structure formed in the liquid crystal writing tablet 000 is a three-dimensional coil. Thus, when the erasing tool moves on the liquid crystal writing tablet, the electromagnetic field generated by the first coil structure of the erasing tool can induce a larger current within this three-dimensional coil structure, thereby making the sensing signal output from the electromagnetic touch layer 102 stronger. This makes the position information of the erasing tool on the liquid crystal writing tablet 000 determined by the subsequent control component 010 more accurate, resulting in a better local erasing effect on the liquid crystal writing tablet 000. Correspondingly, when the liquid crystal writing tablet 000 is in writing mode, the position information of the writing tool on the liquid crystal writing tablet 000 can also be determined more accurately, resulting in better preservation of handwriting on the liquid crystal writing tablet 000.

[0170] In the embodiments of this application, such as Figure 17 As shown, the first substrate 100 may further include multiple data lines 106 and multiple gate lines 107. The electromagnetic signal line 1021 is disposed on a different layer from the data lines 106 and also on a different layer from the gate lines 107. That is, the electromagnetic signal line 1021 is not multiplexed with the gate lines 107 or the data lines 106 in the first substrate 100.

[0171] In this application, the electromagnetic touch layer 102 can be positioned in various structures within the first substrate 100. This embodiment will only illustrate the following two structures as examples:

[0172] The first structure, such as Figure 17 As shown, the electromagnetic touch layer 102 is located on the side of the first substrate 101 closer to the second substrate 201. Here, the first substrate 100 may further include: a first planarization layer 1010 located between the data line 106 and a set of electromagnetic signal lines 1021e; a second planarization layer 1011 located between the set of electromagnetic signal lines 1021e and a set of electromagnetic signal lines 1021d; and a third planarization layer 1012 located between the set of electromagnetic signal lines 1021d and the pixel electrode layer 103. The second planarization layer 1011 has vias V1 for connecting the electromagnetic signal lines in these two sets of electromagnetic signal lines. Here, the pixel electrode layer 103 is located on the side of the set of electromagnetic signal lines 1021d facing away from the first substrate 101. In this way, the pixel electrode layer 103 can be closer to the common electrode layer 202 within the second substrate 200 of the liquid crystal handwriting tablet 000, making it easier for the liquid crystal molecules between the pixel electrode layer 103 and the common electrode layer 202 to deflect under the action of an electric field.

[0173] For the second structure, please refer to... Figure 18 , Figure 18 It is another kind Figure 16 The diagram shows the film structure at point B-B'. The electromagnetic touch layer 102 is located on the side of the first substrate 101 facing away from the second substrate 201. Here, the first substrate 100 may further include: a fourth planarization layer 1013 between the first substrate 101 and a set of electromagnetic signal lines 1021d; a fifth planarization layer 1014 between a set of electromagnetic signal lines 1021e and a set of electromagnetic signal lines 1021d; and a sixth planarization layer 1015 located on the side of the fifth planarization layer 1014 facing away from the first substrate 101. Here, the fifth planarization layer 1014 has a via V2 for connecting the electromagnetic signal lines in the two sets of electromagnetic signal lines.

[0174] Regarding the two optional implementation methods mentioned above, such as Figure 13 , Figure 15 , Figure 17 and Figure 18 As shown, the first substrate 100 in the liquid crystal handwriting tablet 000 may further include: a plurality of driving transistors T2, and a pixel electrode layer 103 having a plurality of pixel electrodes 103a electrically connected to the plurality of driving transistors T2 in a one-to-one correspondence. Here, the driving transistor T2 may include: a gate T2a, a first electrode T2b, a second electrode T2c, and an active layer T2d. The first electrode T2b and the second electrode T2c are both connected to the active layer T2d, and the active layer T2d is insulated from the gate T2a. For example, the active layer T2d and the gate T2a can be insulated from each other by a gate insulating layer 109. For example, the above... Figure 13 and Figure 15 The thin-film transistor shown is the driving transistor T2.

[0175] The embodiments in this application are illustrated using the example of the gate T2a of the driving transistor T2 being closer to the substrate 1012 relative to the active layer T2d, i.e., the driving transistor T2 is a bottom-gate type transistor. In other possible implementations, the driving transistor T2 can also be a top-gate type transistor, which is not limited in this application. It should also be noted that the first electrode T2b of the driving transistor T2 can be one of the source and drain, and the second electrode T2c can be the other of the source and drain. For example, the first electrode T2b of the driving transistor T2 is electrically connected to the pixel electrode 103a through a via.

[0176] It should be noted that the gate line 107 in the first substrate 100 can be disposed in the same layer and made of the same material as the gate T2a in the driving transistor T2. That is, the gate line 107 and the gate T2a in the driving transistor T2 are obtained through a single patterning process. The data line 106 can be disposed in the same layer and made of the same material as the first electrode T2b and the second electrode T2c in the driving transistor T2. That is, the data line 106 and the first electrode T2b and the second electrode T2c in the driving transistor T2 are obtained through a single patterning process.

[0177] It should also be noted that the multiple driving transistors T2 and multiple thin-film transistors T1 in the LCD handwriting tablet 000 are arranged on the same layer. For example, the gate T2a in the driving transistor T2 and the gate in the thin-film transistor T1 are obtained through a single patterning process; the active layer T2d in the driving transistor T2 and the active layer in the thin-film transistor T1 are obtained through a single patterning process; the first electrode T2b and the second electrode T2c in the driving transistor T2, and the first electrode and the second electrode in the thin-film transistor T1, are obtained through a single patterning process. This single patterning process, as well as the single patterning process in the above embodiments, includes: photoresist coating, exposure, development, etching, and photoresist stripping.

[0178] In summary, the liquid crystal writing tablet provided in this application includes: a first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer located between the two. Since the electromagnetic touch layer in the liquid crystal writing tablet has interconnected electromagnetic signal lines, and these interconnected electromagnetic signal lines can form a coil structure, this coil structure can cooperate with the first coil structure in the erasing tool or the second coil structure in the writing tool. This allows the control components in the writing device to determine the position information of the erasing tool or the writing tool on the liquid crystal writing tablet after the liquid crystal writing tablet is integrated into the writing device. Thus, the writing device can achieve the function of partially erasing or saving handwriting. Therefore, this application does not require an infrared positioning device in the liquid crystal writing tablet; only the electromagnetic touch layer integrated in the first substrate is needed to achieve the function of partially erasing or saving handwriting, effectively reducing the overall thickness of the liquid crystal writing tablet and the width of its bezel, resulting in a higher screen-to-body ratio.

[0179] This application also provides a handwriting device, such as... Figure 5As shown, the handwriting device may include: a liquid crystal handwriting tablet 000, and a control component 010 electrically connected to the liquid crystal handwriting tablet 000. The liquid crystal handwriting tablet 000 may be the liquid crystal handwriting tablet described in the above embodiment. The control component 010 is configured to: when the liquid crystal handwriting tablet 000 is in erase mode, acquire a first sensing signal output by the electromagnetic touch layer, and determine the position information of the area to be erased based on the first sensing signal and the correspondence between the touch position and the sensing signal recorded by the control component; when the liquid crystal handwriting tablet 000 is in writing mode, acquire a second sensing signal output by the electromagnetic touch layer, and determine the position information of the written handwriting based on the second sensing signal and the correspondence.

[0180] For details on the specific structure and working principle of the handwriting device, please refer to the corresponding content in the above embodiments. This application will not repeat these details in its embodiments.

[0181] This application also provides a control method for a handwriting device. This handwriting device can be the handwriting device provided in the above embodiments. The control method for this handwriting device may include: when the liquid crystal handwriting tablet is in erase mode, determining the position information of the area to be erased through an electromagnetic touch layer, and applying a pixel voltage to the pixel electrode in the area to be erased to create a voltage difference between the pixel electrode and the common electrode layer in the area to be erased; when the liquid crystal handwriting tablet is in writing mode, determining the position information of the writing strokes through an electromagnetic touch layer, and generating image information corresponding to the writing strokes.

[0182] For the specific principles of the control method for the handwriting device, please refer to the corresponding content in the above embodiments. This application will not repeat these details in the embodiments.

[0183] This application also provides a handwriting system, please refer to... Figure 19 , Figure 19 This is a schematic diagram of a handwriting system provided in an embodiment of this application. The handwriting system may include an erasing tool 111 and a handwriting device 001. The erasing tool 111 has a first coil structure. The liquid crystal handwriting tablet 000 may be the liquid crystal handwriting tablet described in the above embodiment; for example, the liquid crystal handwriting tablet 000 may be... Figure 3 , Figure 8 , Figure 11 , Figure 13 , Figure 15 or Figure 16 The LCD handwriting tablet is shown. The erasing tool 111 can be either the actively driven erasing tool or the passively driven erasing tool described above.

[0184] In this embodiment of the application, when the erasing tool is an actively driven erasing tool, the LCD handwriting tablet 000 can be... Figure 11The specific erasing principle and process of the LCD handwriting tablet shown are described in the corresponding content of the above embodiments, and will not be repeated here. When the erasing tool is a passively driven erasing tool, the LCD handwriting tablet 000 can be... Figure 8 For the specific erasing principle and process of the liquid crystal handwriting tablet shown, please refer to the corresponding content in the above embodiments, which will not be repeated here.

[0185] Please refer to the following in this application: Figure 20 , Figure 20 This is a schematic diagram of another handwriting system provided in an embodiment of this application. The handwriting system 111 may further include a handwriting tool 222, which has a second coil structure. The liquid crystal handwriting tablet 000 may be the liquid crystal handwriting tablet described in the above embodiment; for example, the liquid crystal handwriting tablet 000 may be... Figure 3 , Figure 8 , Figure 11 , Figure 13 , Figure 15 or Figure 16 The liquid crystal handwriting tablet is shown. The handwriting tool 222 can be either the actively driven handwriting tool or the passively driven handwriting tool described above.

[0186] In this embodiment of the application, when the handwriting tool is an actively driven handwriting tool, the liquid crystal handwriting tablet 000 can be... Figure 11 The specific principle and process of saving handwriting on the LCD handwriting tablet shown are described in the corresponding content of the above embodiments, and will not be repeated here. When the handwriting tool is a passively driven handwriting tool, the LCD handwriting tablet 000 can be... Figure 8 The principle and process of saving handwriting on the LCD handwriting tablet shown are described in the corresponding content of the above embodiments, and will not be repeated here.

[0187] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0188] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0189] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A liquid crystal handwriting pad, characterized by, include: A first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer located between the first substrate and the second substrate, the liquid crystal layer comprising bistable liquid crystal molecules; The first substrate includes: a first substrate, and an electromagnetic touch layer and a pixel electrode layer located on one side of the first substrate. The electromagnetic touch layer has multiple electromagnetic signal lines, and each pair of adjacent electromagnetic signal lines are connected in series. The second substrate includes: a second substrate, and a common electrode layer located on one side of the second substrate; The first substrate further includes: multiple data lines and multiple gate lines; the multiple electromagnetic signal lines in the electromagnetic touch layer are at least one of the multiple data lines and the multiple gate lines; Among the multiple data lines, the data line that serves as the electromagnetic signal line is a multiplexed data line; among the multiple gate lines, the gate line that serves as the electromagnetic signal line is a multiplexed gate line; At least one of the multiplexed data line and the multiplexed gate line has: a plurality of electromagnetic enhancement parts and a plurality of connecting parts that are electrically connected to each other, wherein the plurality of electromagnetic enhancement parts and the plurality of connecting parts are arranged alternately.

2. The liquid crystal handwriting tablet according to claim 1, characterized in that, The first substrate further includes: a plurality of first connection structures and a plurality of second connection structures, wherein the plurality of first connection structures are distributed on one side of the plurality of electromagnetic signal lines and the plurality of second connection structures are distributed on the other side of the plurality of electromagnetic signal lines; Wherein, one end of the first electromagnetic signal line is electrically connected to one end of the second electromagnetic signal line through the first connecting structure, and the other end is electrically connected to one end of the third electromagnetic signal line through the second connecting structure. The first electromagnetic signal line is one of the plurality of electromagnetic signal lines, the second electromagnetic signal line is one of the plurality of electromagnetic signal lines located on one side of the first electromagnetic signal line, and the third electromagnetic signal line is one of the plurality of electromagnetic signal lines located on the side of the first electromagnetic signal line away from the second electromagnetic signal line. Both the first connection structure and the second connection structure are switches.

3. The liquid crystal handwriting tablet according to claim 2, characterized in that, The switch includes a first pole, a second pole, and a control pole, wherein the control pole is used to turn on the first pole and the second pole when a conduction signal is received; Wherein, the first pole and the second pole are respectively electrically connected to the ends of the two electromagnetic signal lines; The first substrate further includes: at least two switch control lines, wherein one of the at least two switch control lines is electrically connected to at least a portion of the control electrode of the first connection structure, and the other switch control line is electrically connected to at least a portion of the control electrode of the second connection structure; When the at least two switch control lines open both the first connection structure and the second connection structure, the electromagnetic signal lines electrically connected to the first connection structure and the second connection structure are connected in series.

4. The liquid crystal handwriting tablet according to claim 3, characterized in that, The at least two switch control lines include N sets of switch control lines, where N is an integer greater than 1; A set of the switch control lines includes: a switch control line for electrically connecting to the control electrode of at least a portion of the first connection structure, and a switch control line for electrically connecting to the control electrode of at least a portion of the second connection structure; The control electrodes of adjacent first connection structures are electrically connected to different groups of switch control lines; the control electrodes of adjacent second connection structures are electrically connected to different groups of switch control lines.

5. The liquid crystal handwriting tablet according to claim 4, characterized in that, The LCD handwriting tablet includes: N adjacent first connection structures and N adjacent second connection structures; Among them, N adjacent first connection structures are electrically connected to different groups of switch control lines, and N adjacent second connection structures are electrically connected to different groups of switch control lines.

6. The liquid crystal handwriting tablet according to claim 5, characterized in that, In at least a portion of the LCD handwriting pad, N adjacent first connection structures are arranged at equal intervals, and N adjacent second connection structures are arranged at equal intervals.

7. The liquid crystal handwriting tablet according to claim 3, characterized in that, The at least two switch control lines include two switch control lines arranged on the same layer; Of the two switch control lines, one switch control line is electrically connected to the control electrode of all the first connection structures, and the other switch control line is electrically connected to the control electrode of all the second connection structures.

8. The liquid crystal handwriting tablet according to claim 3, characterized in that, The electromagnetic touch layer is located on the side of the first substrate closer to the second substrate. The electromagnetic touch layer in the first substrate has two layers. The electromagnetic signal lines in one layer of the electromagnetic touch layer are the data lines, and the electromagnetic signal lines in the other layer of the electromagnetic touch layer are the gate lines. The data lines extend along a first direction, and the gate lines extend along a second direction. The first direction and the second direction are different. The at least two switch control lines include: two first switch control lines and two second switch control lines, wherein the extension direction of the first switch control lines is the second direction, and the extension direction of the second switch control lines is the first direction; The plurality of data lines are arranged between two first switch control lines, and the first switch control lines are electrically connected to the control electrode of a switch used to connect two adjacent multiplexed data lines; the plurality of gate lines are arranged between two second switch control lines, and the second switch control lines are electrically connected to the control electrode of a switch used to connect two adjacent multiplexed gate lines.

9. The liquid crystal handwriting tablet according to claim 8, characterized in that, When the multiplexed data line has the plurality of electromagnetic enhancement portions and the plurality of connection portions, the orthographic projection of a portion of the gate line on the first substrate is located within the area enclosed by the orthographic projection of the electromagnetic enhancement portion of the multiplexed data line on the first substrate; And / or, when the multiplexed gate line has the plurality of electromagnetic enhancement portions and the plurality of connection portions, the orthographic projection of a portion of the data line onto the first substrate lies within the area enclosed by the orthographic projection of the electromagnetic enhancement portion of the multiplexed gate line onto the first substrate.

10. The liquid crystal handwriting tablet according to claim 9, characterized in that, The electromagnetic enhancement part is a ring-shaped part or a U-shaped part.

11. The liquid crystal handwriting tablet according to claim 8, characterized in that, The first substrate has multiple sub-pixel regions arranged in an array; At least one of the multiplexed data line and the multiplexed gate line has: a plurality of first extensions and a plurality of second extensions that are electrically connected to each other, the plurality of first extensions and the plurality of second extensions being arranged alternately with their ends grounded, and the extension direction of the first extensions intersecting the extension direction of the second extensions; Wherein, any two adjacent first extensions and the second extension between the two adjacent first extensions form a bending structure, and the area enclosed by the bending structure partially surrounds at least a portion of the area within a sub-pixel region.

12. The liquid crystal writing tablet according to any one of claims 8 to 11, characterized in that, The two electromagnetic touch layers are: a first electromagnetic touch layer and a second electromagnetic touch layer, both of which have two signal ports; The two signal ports in the first electromagnetic touch layer are insulated from the two signal ports in the second electromagnetic touch layer, and the two signal ports in the first electromagnetic touch layer are both signal input ports, while the two signal ports in the second electromagnetic touch layer are both signal output ports. Alternatively, the two signal ports in the first electromagnetic touch layer are electrically connected to the two signal ports in the second electromagnetic touch layer, and both the two signal ports in the first electromagnetic touch layer and the two signal ports in the second electromagnetic touch layer are signal output ports.

13. The liquid crystal handwriting tablet according to claim 12, characterized in that, When the two signal ports in the first electromagnetic touch layer are electrically connected to the two signal ports in the second electromagnetic touch layer, the two ends of one first switch control line are electrically connected to one end of the two second switch control lines, and the two ends of one second switch control line are electrically connected to one end of the two first switch control lines.

14. The liquid crystal writing tablet according to any one of claims 8 to 11, characterized in that, In at least a portion of the area of ​​the LCD handwriting pad, the data lines are all multiplexed data lines, and / or, in at least a portion of the area of ​​the LCD handwriting pad, the gate lines are all multiplexed gate lines.

15. A liquid crystal handwriting tablet, characterized in that, include: A first substrate and a second substrate disposed opposite to each other, and a liquid crystal layer located between the first substrate and the second substrate, the liquid crystal layer comprising bistable liquid crystal molecules; The first substrate includes: a first substrate, and an electromagnetic touch layer and a pixel electrode layer located on one side of the first substrate. The electromagnetic touch layer has multiple electromagnetic signal lines, and each pair of adjacent electromagnetic signal lines are connected in series. The second substrate includes: a second substrate, and a common electrode layer located on one side of the second substrate; The multiple electromagnetic signal lines are divided into two groups, and the two groups of electromagnetic signal lines are arranged in different layers. The two ends of one electromagnetic signal line in one group are respectively electrically connected to two electromagnetic signal lines in the other group. The first substrate has multiple sub-pixel regions arranged in an array; Each electromagnetic signal line comprises multiple signal segments connected in sequence. A portion of the signal segments is parallel to the row arrangement of the multiple sub-pixel regions, and another portion of the signal segments is parallel to the column arrangement of the multiple sub-pixel regions. Wherein, after one end of one electromagnetic signal line in one group of electromagnetic signal lines is electrically connected to one end of one electromagnetic signal line in another group of electromagnetic signal lines, these two electromagnetic signal lines can form at least one sub-pixel region.

16. The liquid crystal handwriting tablet according to claim 15, characterized in that, One of the electromagnetic signal lines in a group of electromagnetic signal lines partially surrounds at least one of the sub-pixel regions.

17. The liquid crystal handwriting tablet according to claim 16, characterized in that, The first substrate further includes: multiple data lines and multiple gate lines, wherein the electromagnetic signal lines are disposed on a different layer from the data lines and on a different layer from the gate lines; The electromagnetic touch layer is located on the side of the first substrate closer to the second substrate, the electromagnetic signal line has an insulating layer on the side away from the first substrate, and the pixel electrode layer is located on the side of the insulating layer away from the first substrate. Alternatively, the electromagnetic touch layer is located on the side of the first substrate opposite to the second substrate.

18. The liquid crystal handwriting tablet according to any one of claims 1-11, 13, and 15-17, characterized in that, The first substrate further includes: a plurality of driving transistors, and the pixel electrode layer has a plurality of pixel electrodes electrically connected to the plurality of driving transistors in a one-to-one correspondence.

19. The liquid crystal handwriting tablet according to claim 18, characterized in that, The first substrate or the second substrate is a flexible substrate, and the flexible substrate is located on the writing side of the liquid crystal writing tablet.

20. A handwriting device, characterized in that, include: The liquid crystal writing tablet according to any one of claims 1 to 19, and the control component electrically connected to the liquid crystal writing tablet; The control component is configured to: when the LCD handwriting tablet is in erase mode, determine the position information of the area to be erased through the electromagnetic touch layer, and apply a pixel voltage to the pixel electrode in the area to be erased, so as to form a voltage difference between the pixel electrode in the area to be erased and the common electrode layer.

21. The handwriting device according to claim 20, characterized in that, The control component is configured to: when the LCD handwriting pad is in erase mode, acquire a first sensing signal output by the electromagnetic touch layer, and determine the position information of the area to be erased based on the first sensing signal and the correspondence between the touch position and the sensing signal recorded by the control component.

22. The handwriting device according to claim 21, characterized in that, The control component is configured to: when the LCD handwriting tablet is in writing mode, determine the position information of the writing strokes through the electromagnetic touch layer, and generate image information corresponding to the writing strokes; The control component is further configured to: when the LCD handwriting tablet is in writing mode, acquire a second sensing signal output by the electromagnetic touch layer, and determine the position information of the writing strokes based on the second sensing signal and the correspondence.

23. The handwriting device according to claim 22, characterized in that, The handwriting device further includes a switch electrically connected to the control component, the switch being configured to control the LCD handwriting tablet to switch between the erase mode and the writing mode.

24. A handwriting system, characterized in that, include: The erasing tool and the handwriting device according to any one of claims 20 to 23, wherein the erasing tool has a first coil structure.

25. The handwriting system according to claim 24, characterized in that, The handwriting system further includes a handwriting tool having a second coil structure.

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