Erasing tool and handwriting system

Abstract

The application discloses an erasing tool and a handwriting system, and belongs to the technical field of display. The erasing tool comprises a supporting part and an erasing part fixedly connected with the supporting part. One side of the erasing part away from the supporting part is an erasing surface, and the erasing surface has a transition area. The area of the sensing structure arranged in the transition area and contacting with the display surface of the electronic handwriting board is usually small, and only part of the sensing structure in the transition area contacts with the display surface of the electronic handwriting board when the transition area of the erasing surface contacts with the display surface of the electronic handwriting board. Therefore, the part of the sensing structure in the transition area of the erasing surface can realize small-area erasing of the writing traces presented by the electronic handwriting board, and effectively improves the effect of the liquid crystal handwriting board in local erasing.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to an erasing tool 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 displayed on the LCD handwriting tablet, the infrared positioning device can determine the contact position between the tool and the tablet, thus identifying the area to be erased. The tablet can then control the pixel electrodes within the erasable area to remove the handwriting.

[0004] However, the contact area between the erasing tool and the LCD writing tablet is usually large, resulting in poor performance when the LCD writing tablet is used for localized erasing. Summary of the Invention

[0005] This application provides an erasing tool. It solves the problem of poor local erasing performance in existing LCD handwriting tablets. The technical solution is as follows:

[0006] On the one hand, an erasing tool is provided, comprising: a support portion, and an erasing portion fixedly connected to the support portion;

[0007] The side of the erasing part away from the support part is the erasing surface. The erasing surface has a transition area. A sensing structure is provided in the transition area of ​​the erasing surface. The sensing structure is used to contact the display surface of the electronic writing tablet so that the electronic writing tablet erases the writing marks in the contact area with the sensing structure.

[0008] Optionally, the portion of the erasing section located within the transition zone is configured to deform upon being subjected to pressure.

[0009] Optionally, the portion of the erasing surface located within the transition zone is an arc-shaped convex surface.

[0010] Optionally, the erasing surface further has a central area, the portion of the erasing surface located within the central area being a plane, and the arc-shaped convex surface being distributed around the plane.

[0011] Optionally, at least a portion of the erasing portion is integral with the sensing structure and is made of a conductive material;

[0012] Alternatively, at least a portion of the erasing portion may include the sensing structure, which includes a pressure-deformed structure and a conductive layer located outside the pressure-deformed structure.

[0013] Optionally, the sensing structure includes: a plurality of protrusions arranged in an array, wherein some of the protrusions are configured to change the relative positions of the different protrusions after being subjected to pressure;

[0014] Wherein, when the sensing structure includes a pressure-deformed structure, the pressure-deformed structure includes the protrusion.

[0015] Optionally, the erasing unit includes: a housing, and a light source located within the housing, the housing having the erasing surface.

[0016] Optionally, the light source includes: a plurality of point light sources, and the erasing unit further includes: a controller located inside the housing, the controller being electrically connected to each of the light sources and the point light sources respectively;

[0017] The controller is configured to, after the erasing surface comes into contact with the display surface of the electronic writing tablet, control a portion of the multiple point light sources to emit light toward the contact area between the erasing surface and the display surface of the electronic writing tablet.

[0018] Optionally, the sensing structure includes: a plurality of first touch electrodes arranged in an array, the plurality of first touch electrodes corresponding to the plurality of point light sources; and the controller being electrically connected to each of the first touch electrodes.

[0019] The controller is configured to control the point light source corresponding to the first touch electrode whose signal changes among the plurality of first touch electrodes to emit light.

[0020] Optionally, the sensing structure includes: a plurality of first pressure sensors arranged in an array, the plurality of first pressure sensors corresponding to the plurality of point light sources; the controller being electrically connected to each of the first pressure sensors; the controller being configured to: control the point light source corresponding to the first pressure sensor among the plurality of first pressure sensors that detects the applied pressure to emit light.

[0021] Optionally, the erasing surface further has a central region, in which a sensing element is disposed, the sensing element being electrically connected to the controller, the sensing element including: at least one second touch electrode and / or at least one second pressure sensor.

[0022] Optionally, the light-emitting sides of the plurality of point light sources are all attached to the inner side of the housing.

[0023] Optionally, the point light source includes: a light-emitting device, and a collimation structure located on the light-emitting side of the light-emitting device, the collimation structure being used to adjust the light-emitting angle of the light-emitting device so that the light emitted by the point light source is emitted perpendicularly from the erasing surface.

[0024] On the other hand, a handwriting system is provided, including: a liquid crystal handwriting tablet and any of the erasure tools described above.

[0025] Optionally, the electronic writing tablet includes: a first substrate and a second substrate disposed opposite to each other, and a bistable liquid crystal molecule layer located between the first substrate and the second substrate;

[0026] The first substrate includes: a first substrate and a plurality of pixel electrodes located on one side of the first substrate; the second substrate includes: a second substrate and a common electrode located on one side of the second substrate;

[0027] The electronic handwriting tablet is configured such that, after the erasing part of the erasing tool contacts the second substrate, the area in contact between the erasing part and the second substrate is defined as the area to be erased, and a pixel voltage is applied to the pixel electrode in the area to be erased, so that a voltage difference is formed between the pixel electrode in the area to be erased and the common electrode.

[0028] Optionally, when the erasing portion and the sensing structure are integrally formed and made of a conductive material, the second substrate further includes: a touch electrode layer located on one side of the second substrate, and a first insulating layer located between the touch electrode layer and the common electrode, wherein the touch electrode layer is closer to the second substrate than the common electrode;

[0029] The liquid crystal writing tablet is configured to detect the position information of the area to be erased through the touch electrode layer after the erasing part contacts the second substrate.

[0030] Optionally, when the erasing part includes a housing and a light source located within the housing, the liquid crystal writing tablet further includes a photosensitive component;

[0031] The liquid crystal writing tablet is configured such that, after the erasing part contacts the second substrate and the light source emits light to the contact area between the erasing part and the second substrate, the position information of the area to be erased is detected by the photosensitive component.

[0032] The beneficial effects of the technical solutions provided in this application include at least the following:

[0033] In summary, the erasing tool provided in this application includes a support portion and an erasing portion fixedly connected to the support portion. The side of the erasing portion away from the support portion is the erasing surface, which has a transition zone. The contact area between the sensing structure in the transition zone and the display surface of the electronic writing tablet is typically small, and when the transition zone in the erasing surface contacts the display surface of the electronic writing tablet, only a portion of the sensing structure in the transition zone contacts the display surface. Therefore, by using the partial sensing structure in the transition zone of the erasing surface, a small area of ​​writing on the electronic writing tablet can be erased, effectively improving the effect of local erasing on the liquid crystal writing tablet.

[0034] Furthermore, when the erasing surface has both a transition area and a central area, the area of ​​the central area is much larger than the area of ​​the transition area. Therefore, when a user needs to erase a large area of ​​writing on the LCD writing tablet using the erasing tool, the central area of ​​the erasing tool's erasing surface can be made to contact the display surface of the electronic writing tablet. When a user needs to erase a small area of ​​writing on the electronic writing tablet using the erasing tool, the sensing structure within the transition area of ​​the erasing tool's erasing surface can be made to contact the display surface of the electronic writing tablet. This further improves the effectiveness of partial erasing on the LCD writing tablet. Attached Figure Description

[0035] 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.

[0036] Figure 1 This is a top view of a liquid crystal handwriting tablet provided by related technologies;

[0037] Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the LCD handwriting tablet at point A-A'.

[0038] Figure 3 This is a schematic diagram of the structure of an erasing tool provided in an embodiment of this application;

[0039] Figure 4 This is a schematic diagram of another erasing tool provided in an embodiment of this application;

[0040] Figure 5 This is a schematic diagram of the distribution of multiple sensing structures arranged in an array according to an embodiment of this application;

[0041] Figure 6This is a schematic diagram of the distribution of multiple sensing structures arranged in an array according to an embodiment of this application;

[0042] Figure 7 This is a schematic diagram showing the distribution of multiple sensing structures arranged in an array, as provided in another embodiment of this application.

[0043] Figure 8 This is a partial schematic diagram of a sensing structure with the erasing part located in the transition zone, provided in an embodiment of this application;

[0044] Figure 9 This is a schematic diagram of the protrusion distribution of a compressive deformation structure provided in another embodiment of this application;

[0045] Figure 10 This is a schematic diagram showing the distribution of protrusions in another compression deformation structure provided in another embodiment of this application;

[0046] Figure 11 This is a schematic diagram showing the distribution of protrusions in another embodiment of the compressive deformation structure provided in this application;

[0047] Figure 12 This is a schematic diagram of another erasing tool provided in an embodiment of this application;

[0048] Figure 13 This is a cross-sectional view of an erasing section at the transition zone provided in an embodiment of this application;

[0049] Figure 14 This is a cross-sectional view of another erasing section at the transition zone provided in an embodiment of this application;

[0050] Figure 15 This is a schematic diagram of the structure of a first point light source provided in an embodiment of this application;

[0051] Figure 16 This is a schematic diagram of a structure of multiple second point light sources provided in an embodiment of this application;

[0052] Figure 17 This is a schematic diagram of the structure of a handwriting system provided in an embodiment of this application;

[0053] Figure 18 This is a schematic diagram of the film layer structure of a liquid crystal handwriting tablet provided in this application;

[0054] Figure 19 This is a top view of a liquid crystal handwriting tablet provided in this application;

[0055] Figure 20 This is a schematic diagram of the film structure of a second substrate provided in an embodiment of this application;

[0056] Figure 21This is a schematic diagram of the film layer structure of another liquid crystal handwriting tablet provided in this application. Detailed Implementation

[0057] 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.

[0058] 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 1 The 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.

[0059] 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.

[0060] 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., writing instruments or erasing instruments) on the LCD handwriting tablet 00 through the infrared light emitted by the infrared positioning device 02.

[0061] When the LCD writing tablet 00 is in erase mode, the eraser tool 03 moves on the LCD panel 01. The LCD writing tablet 00 determines the position of the eraser tool 03 on the LCD panel 01 using infrared light emitted by the infrared positioning device 03, 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 1021. 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 the same color as the background of the LCD writing tablet, thus erasing the written handwriting within the area.

[0062] However, since the erasing tool 03 is typically large, the contact area between it and the LCD writing tablet 00 is also typically large. Therefore, the area to be erased, determined by the infrared positioning device 02, is also large, making it difficult for the erasing tool 03 to erase writing in smaller areas of the LCD writing tablet 00. Consequently, the effect of localized erasing on the LCD writing tablet 00 is poor.

[0063] Please refer to Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of an erasing tool provided in an embodiment of this application. Figure 4 This is a schematic diagram of another erasing tool provided in an embodiment of this application. The erasing tool 000 may include: a support portion 100, and an erasing portion 200 fixedly connected to the support portion 100.

[0064] The support part 100 is used to support the erasing part 200. For example, when a user needs to erase the handwriting on the electronic writing tablet using the erasing tool 000, the user can hold the support part 100 of the erasing tool 000 so that the erasing part 200 on the support part 100 comes into contact with the display surface of the electronic writing tablet.

[0065] The wiping part 200 of the wiping tool 000 has a wiping surface on the side away from the support part 100. The wiping surface has a transition area 202, and a sensing structure 2021 is provided in the transition area 202. Figure 3 and Figure 4 (Not shown in the image), the sensing structure 2021 is used to contact the display surface of the electronic writing tablet so that the electronic writing tablet can erase the writing marks in the contact area with the sensing structure 2021.

[0066] In this embodiment, the contact area between the sensing structure 2021 disposed in the transition area 202 of the erasing surface of the erasing unit 200 and the display surface of the electronic writing tablet is typically small. Furthermore, when the transition area 202 of the erasing surface contacts the display surface of the electronic writing tablet, only a portion of the sensing structure 2021 within the transition area 202 contacts the display surface. Therefore, by using only a portion of the sensing structure 2021 within the transition area 202 of the erasing surface, a small area of ​​the handwriting displayed on the electronic writing tablet can be erased.

[0067] In other possible implementations, such as Figure 3 and Figure 4As shown, the erasing surface of the erasing unit 200 includes not only a transition area 202 but also a central area 201. The transition area 202 in the erasing surface can be arranged around the central area 201. In this case, the area of ​​contact between the transition area 202 of the erasing surface and the display surface of the electronic writing tablet is much smaller than the area of ​​contact between the central area 201 of the erasing surface and the display surface of the electronic writing tablet.

[0068] Thus, when a user needs to erase a large area of ​​writing on the electronic writing tablet using the erasing tool 000, the central area 201 of the erasing surface of the erasing tool 000 can be brought into contact with the display surface of the electronic writing tablet. When a user needs to erase a small area of ​​writing on the electronic writing tablet using the erasing tool 000, a portion of the sensing structure 2021 within the transition 202 of the erasing surface of the erasing tool 000 can be brought into contact with the display surface of the electronic writing tablet.

[0069] In this embodiment, after the erasing part 200 of the erasing tool 000 contacts the display surface of the electronic writing tablet, the electronic writing tablet can determine the position of the contact area between the erasing part 200 and the display surface of the electronic writing tablet, and determine the position of this contact area as the position of the area to be erased. Then, the electronic writing tablet can drive the corresponding control circuit according to the position of the area to be erased, thereby erasing the writing in the area to be erased.

[0070] It should be noted that the electronic writing tablet can be an LCD writing tablet (e.g., a light-powered blackboard), an electronic whiteboard, or an electronic blackboard, etc., which have writing and erasing functions. This application does not limit this.

[0071] In summary, the erasing tool provided in this application includes a support portion and an erasing portion fixedly connected to the support portion. The side of the erasing portion away from the support portion is the erasing surface, which has a transition zone. The contact area between the sensing structure in the transition zone and the display surface of the electronic writing tablet is typically small, and when the transition zone in the erasing surface contacts the display surface of the electronic writing tablet, only a portion of the sensing structure in the transition zone contacts the display surface. Therefore, by using the partial sensing structure in the transition zone of the erasing surface, a small area of ​​writing on the electronic writing tablet can be erased, effectively improving the effect of local erasing on the liquid crystal writing tablet.

[0072] Furthermore, when the erasing surface has both a transition area and a central area, the area of ​​the central area is much larger than the area of ​​the transition area. Therefore, when a user needs to erase a large area of ​​writing on the LCD writing tablet using the erasing tool, the central area of ​​the erasing tool's erasing surface can be made to contact the display surface of the electronic writing tablet. When a user needs to erase a small area of ​​writing on the electronic writing tablet using the erasing tool, the sensing structure within the transition area of ​​the erasing tool's erasing surface can be made to contact the display surface of the electronic writing tablet. This further improves the effectiveness of partial erasing on the LCD writing tablet.

[0073] In the embodiments of this application, such as Figure 3 and Figure 4 As shown, when the erasing surface of the erasing tool 000 has a transition area 202 and a central area 201, to meet different erasing needs of users, the portion of the erasing surface located in the central area 201 can be flat, while the portion located in the transition area 202 can be an arc-shaped convex surface. This results in a larger contact area between the portion in the central area 201 and the display surface of the electronic writing tablet, allowing the electronic writing tablet to erase writing within a large area in a single erase, thus increasing its efficiency in erasing large areas. Conversely, because the portion in the transition area 202 is an arc-shaped convex surface, the contact area between the transition area 202 and the display surface of the electronic writing tablet is smaller, allowing the electronic writing tablet to erase writing within a smaller area, thus increasing its efficiency in erasing small areas.

[0074] It should be noted that, Figure 3 This shows the eraser tool 000 as having a square shape. Figure 4 The erasing tool 000 shown is generally circular. In other possible implementations, the erasing tool 000 may also be generally hexagonal; the embodiments of this application do not limit the shape of the erasing tool.

[0075] It should also be noted that, Figure 3 and Figure 4 Only the case where the erasing surface has both a transition area 202 and a central area 201 is shown. When the erasing surface only has a transition area 202, the erasing surface can be an overall arc-shaped convex surface. In this case, the erasing part 200 in the erasing tool 000 can be an overall hemispherical shape.

[0076] In this application, the portion of the erasing part 200 located within the transition zone 202 is configured to deform upon being subjected to pressure. For example, the portion of the erasing part 200 located within the transition zone 202 can deform in a direction perpendicular to the transition zone 202 upon being subjected to pressure. Thus, after the portion of the erasing part 200 located within the transition zone 202 contacts the display surface of the electronic writing tablet, the user can apply different pressures to the erasing tool 000, causing the portion in contact with the electronic writing tablet to deform to different degrees under different pressures. For example, when the user applies greater pressure to the erasing tool 000, the portion of the erasing part 200 located within the transition zone 202 undergoes greater deformation, and the contact area between the transition zone 202 and the display surface of the electronic writing tablet is larger; conversely, when the user applies less pressure to the erasing tool 000, the portion of the erasing part 200 located within the transition zone 202 undergoes less deformation, and the contact area between the transition zone 202 and the display surface of the electronic writing tablet is smaller. In this way, by adjusting the pressure applied to the erasing tool 000, the user can change the contact area between the part of the erasing section 200 located in the transition zone 202 and the electronic writing tablet, further improving the erasing effect of the electronic writing tablet on the handwriting.

[0077] In this application embodiment, the erasing part 200 in the erasing tool 000 has various structures. This application embodiment illustrates the following three optional implementation methods as examples:

[0078] The first optional implementation method is that the erasing tool 000 can be adapted to an electronic handwriting tablet with a touch electrode layer.

[0079] In one possible scenario, at least a portion of the erasing section 200 in the erasing tool 000 (e.g., the portion containing the transition region 202) is integrally formed with the sensing structure 2021. For example, the sensing structure 2021 and the erasing section 200 may be made of a conductive material. For instance, the sensing structure 2021 and the erasing section 200 may be integrally formed using an injection molding process. For example, the sensing structure 2021 may be made of a conductive material such as conductive foam, conductive rubber, or conductive fibers, which is capable of deformation under pressure. In this case, the conductive erasing section 200 can be used in conjunction with the touch electrode layer in the electronic writing tablet. When the electronic writing tablet is in erasing mode, the erasing section 200 in the erasing tool 000 contacts the display surface of the electronic writing tablet, causing a change in capacitance in the area of ​​the electronic writing tablet in contact with the erasing section 200. Thus, the electronic writing tablet can identify the area where capacitance changes as the area to be erased via the touch electrode layer.

[0080] In this embodiment, when at least a portion of the erasing part 200 is integrally formed with the sensing structure 2021, and this integral structure is made of a conductive material, the sensing structure 2021 may include a plurality of arrayed protrusions. Specifically, the protrusions may be connected to each other using the same material as the protrusions, and the protrusions and the material connecting the protrusions form an integral structure; for example, the protrusions are arrayed on a flexible substrate. The sensing structure 2021 including a plurality of arrayed protrusions facilitates the rebound of the protrusions in contact with the electronic writing tablet after deformation under pressure, restoring them to their shape before being subjected to force.

[0081] Since the protrusions in the sensing structure 2021 can have various shapes, this application will illustrate the following three cases as examples:

[0082] The first case, such as Figure 5 As shown, Figure 5 This is a schematic diagram of the distribution of multiple sensing structures arranged in an array according to an embodiment of this application. In the sensing structure 2021, the end face of each protrusion away from the erasing surface is triangular in shape.

[0083] The second scenario, such as Figure 6 As shown, Figure 6 This is a schematic diagram of the distribution of multiple sensing structures arranged in an array according to an embodiment of this application. In the sensing structure 2021, the end face of each protrusion away from the erasing surface is hexagonal.

[0084] The third scenario, such as Figure 7 As shown, Figure 7 This is a schematic diagram of the distribution of multiple sensing structures arranged in an array according to an embodiment of this application. In the sensing structure 2021, the end face of some protrusions away from the erasing surface is octagonal, and the end face of another protrusion away from the erasing surface is rectangular.

[0085] It should be noted that in other possible implementations, the shape of the end faces of the multiple protrusions in the sensing structure 2021 away from the erasing surface can also be other shapes (e.g., circular), or of course, a combination of multiple different shapes. This application embodiment does not limit this.

[0086] It should also be noted that there is a separating groove 2022 between any two adjacent sensing structures 2021, and the separating groove 2022 and the sensing structure 2021 are also made by an integral molding process.

[0087] In this application, at least some of the protrusions in the sensing structure 2021 are configured such that their relative positions change when pressure is applied (e.g., the protrusions move closer to each other and compress the space of the partition groove 2022 between them). In this case, after the portion of the protrusion located in the transition zone 202 of the erasing section 200 contacts the display surface of the electronic writing tablet, the user can apply pressure to the erasing tool 000, causing the positional relationship between this portion of the protrusion and the surrounding ring of protrusions to also contact the electronic writing tablet under the action of the pressure. In this way, the user can change the contact area between the portion of the protrusion located in the transition zone 202 of the erasing section 200 and the electronic writing tablet by applying different degrees of pressure to the erasing tool 000, thereby improving the erasing effect of the writing on the electronic writing tablet. Preferably, when the shape and arrangement of the protrusions are set to the above three conditions, it is beneficial for the part of the erasing part 200 that contacts the electronic writing tablet to spring back after being deformed under pressure, and return to the shape before being subjected to force.

[0088] In another possible scenario, at least a portion of the erasing section 200 in the erasing tool 000 (e.g., the portion where the transition region 202 is located) includes a sensing structure 2021. Please refer to [reference needed]. Figure 8 , Figure 8 This is a partial schematic diagram of a sensing structure with an erasing part located in a transition region, according to an embodiment of this application. The sensing structure 2021 within the transition region 202 may include: a pressure-deformed structure 2021a and a conductive layer 2021b located outside the pressure-deformed structure 2021a, wherein the pressure-deformed structure 2021a is configured to deform under pressure. It should be noted that the conductive layer 2021b being located outside the pressure-deformed structure 2021a can be understood as the conductive layer 2021b being closer to the electronic writing pad than the pressure-deformed structure 2021a during the erasing operation. Here, the pressure-deformed structure 2021a may include: a substrate B1 and a protrusion B2 located between the substrate B1 and the conductive layer 2021a. The distribution of the protrusion B2 on the substrate B1 can vary; this embodiment will illustrate this with the following three examples:

[0089] The first case, such as Figure 9 As shown, Figure 9 This is a schematic diagram of the protrusion distribution of a pressure-deformed structure according to another embodiment of this application. In the pressure-deformed structure 2021a, the end face of each protrusion away from the erasing surface is triangular in shape.

[0090] The second scenario, such as Figure 10 As shown, Figure 10This is a schematic diagram showing the distribution of protrusions in another embodiment of the pressure-deformation structure provided in this application. In the pressure-deformation structure 2021a, the end face of each protrusion away from the erasing surface is hexagonal.

[0091] The third scenario, such as Figure 11 As shown, Figure 11 This is a schematic diagram showing the distribution of protrusions in another embodiment of the pressure-deformed structure provided in this application. In the pressure-deformed structure 2021a, some of the protrusions have octagonal shapes on their ends away from the erasing surface, while the other protrusions have rectangular shapes on their ends away from the erasing surface.

[0092] Preferably, when the shape and arrangement of the protrusions are set to cases 4-6, it is particularly beneficial that the part of the erasing part 200 that contacts the electronic writing tablet will spring back after being deformed under pressure, and return to the shape before being subjected to force.

[0093] For example, the substrate B1 and protrusion B2 in the pressure-deformation structure 2021a can be an integral structure. For instance, both substrate B1 and protrusion B2 can be made of acrylic material. For example, grooves can be etched into the acrylic substrate B1 to form partition grooves 2022, thereby forming multiple protrusions B2 on substrate B1. Since substrate B1 is generally plate-shaped, and plate-shaped acrylic sheets can be deformed under pressure, substrate B1 in the pressure-deformation structure 2021b can be deformed under pressure. It should be noted that in other possible implementations, substrate B1 and protrusion B2 in the pressure-deformation structure 2021b can also be made of other polymers, and this application embodiment does not limit this.

[0094] In this application, after the substrate B1 in the pressure-deformed structure 2021b is subjected to pressure deformation, the relative positions of the protrusions B2 arranged on the deformed portion of the substrate B1 change, thereby changing the contact area between the sensing structure 2021 located in the transition region 202 of the erasure section 200 and the display surface of the electronic writing tablet. Furthermore, after the pressure applied to the substrate B1 is released, the protrusions B2 provided on the substrate B1 help the substrate B1 return to its undeformed state.

[0095] It should be noted that when the erasing tool 000 is adapted to an electronic writing tablet with a touch electrode layer, not only must the erasing part 200 in the erasing tool 000 be conductive, but the support part 100 in the erasing tool 000 must also be at least partially conductive, and a conductive circuit can be formed between the support part 100 and the erasing part 200. In this way, when the user holds the support part 100 and brings the erasing part 200 into contact with the electronic writing tablet, a conductive circuit can be formed between the erasing part 200, the support part 100, and the user to absorb the charge on the surface of the electronic writing tablet. This allows the touch electrode layer in the electronic writing tablet to sense the charge change and determine the area that needs to be erased.

[0096] The second optional implementation method allows the eraser tool 000 to be adapted to electronic writing tablets with photosensitive components, or to electronic writing tablets based on the principle of light erasure. In this case, please refer to... Figure 12 , Figure 12 This is a schematic diagram of another erasing tool provided in this application embodiment. The erasing part 200 in the erasing tool 000 includes: a housing 203 and a light source 204 located inside the housing. The housing 203 may have an erasing surface. The housing 203 is made of a material that is translucent and has a certain degree of elasticity. Therefore, when the light source 204 inside the housing 203 is turned on, the light emitted by the light source 204 inside the housing 202 can pass through the housing 203 and exit. It should be noted that the portion of the outer surface of the housing 203 located within the transition zone 202 may also be provided with protrusions as described in the first optional implementation, to facilitate the rebound of the erasing part 200 after being subjected to force.

[0097] In one scenario, the erasing unit 200 with the light source 204 can be used in conjunction with the photosensitive component in the electronic writing tablet. When the electronic writing tablet is in erasing mode, after the erasing unit 200 in the erasing tool 000 comes into contact with the display surface of the electronic writing tablet, the light source 204 in the erasing unit 200 emits light into the area in contact with the display surface of the electronic writing tablet, allowing the electronic writing tablet to determine the area illuminated by the light source 204 through the photosensitive component. In this way, the electronic writing tablet can determine the area illuminated by the light source 204 as the area to be erased through the photosensitive component.

[0098] In another scenario, the erasing unit 200 with the light source 204 can be used in conjunction with an electronic writing tablet based on the principle of light erasure. When the electronic writing tablet is in erasure mode, after the erasing unit 200 in the erasure tool 000 comes into contact with the display surface of the electronic writing tablet, the light source 204 in the erasure unit 200 can emit light into the area in contact with the display surface of the electronic writing tablet, and the electronic writing tablet can directly erase the writing marks in the area illuminated by the light source 204.

[0099] In this application, the light source 204 may include multiple point light sources, and the erasing unit 200 may further include a controller 204 located within the housing 203, the controller 204 being electrically connected to each point light source. The controller 205 is configured to, after the erasing surface contacts the display surface of the electronic writing tablet, control a portion of the multiple point light sources to emit light towards the contact area between the erasing surface and the display surface of the electronic writing tablet.

[0100] For example, when the erasing surface in the erasing unit 200 has both a central area 201 and a transition area 202, the multiple point light sources in the erasing unit 200 may include multiple second point light sources 2041 and multiple first point light sources 2042, and the controller 205 in the erasing unit 200 is electrically connected to the second point light sources 2041 and the first point light sources 2042 respectively.

[0101] The controller 205 is configured to: after the center area 201 of the erasable surface comes into contact with the display surface of the electronic writing tablet, control a plurality of second point light sources 2041 to emit light toward the center area 201; and after the transition area 202 of the erasable surface comes into contact with the display surface of the electronic writing tablet, control a portion of the plurality of first point light sources 2042 to emit light toward the contact area between the transition area 202 and the display surface of the electronic writing tablet.

[0102] In this case, the controller 205 can control only the part of the erasing unit 200 that is in contact with the display surface of the electronic writing tablet to emit light. This means that the light source 204 in the erasing unit 200 will only emit light to the contact area between the erasing unit 200 and the electronic writing tablet, and will not emit light to the non-contact area. This effectively avoids the phenomenon of writing marks in the non-contact area of ​​the electronic writing tablet being accidentally erased, thereby improving the accuracy of erasing the writing marks displayed on the electronic writing tablet.

[0103] Optionally, the controller 205 is also configured to: control multiple second point light sources 2041 to stop emitting light after the center area 201 of the erasing surface separates from the display surface of the electronic writing tablet; and control each first point light source 2042 to stop emitting light after the transition area 202 of the erasing surface separates from the display surface of the electronic writing tablet. In this case, the controller 205 in the erasing unit 200 can control the light sources 204 to stop emitting light as soon as it determines that the erasing unit 200 is separated from the electronic writing tablet. This effectively avoids the problem of the light source 204 still emitting light to the electronic writing tablet when the erasing unit 200 is not in contact with the electronic writing tablet, further improving the accuracy of erasing the writing on the electronic writing tablet.

[0104] In this embodiment, the sensing structure 2021 disposed within the transition region 202 of the erasing surface can typically be distributed on the housing 203; that is, the housing 203 can serve as a substrate for supporting the sensing structure 2021. Furthermore, the sensing structure disposed on the housing 203 can be implemented in various ways, and the working principles of different sensing structures 2021 vary. Therefore, this embodiment will illustrate this with the following two examples.

[0105] For the first scenario, please refer to... Figure 13 , Figure 13 This is a cross-sectional view of an erasing section at the transition region provided in an embodiment of this application. The sensing structure 2021 may include a plurality of first touch electrodes C1 arranged in an array. The arrangement of the plurality of first touch electrodes C1 within the transition region 202 of the housing 203 can be referred to... Figure 5 , Figure 6 and Figure 7 This application will not elaborate further on this. The plurality of first touch electrodes C1 in the sensing structure 2021 can correspond to a plurality of first point light sources 2042. For example, the plurality of first touch electrodes C1 can correspond one-to-one with the plurality of first point light sources 2042; or, each first touch electrode C1 can correspond to at least two first point light sources 2042; or, each first point light source 2042 can correspond to at least two first touch electrodes C1. The controller 205 can be electrically connected to each of the first touch electrodes C1. The controller 205 can be configured to control the first point light source 2042 corresponding to the first touch electrode C1 whose signal changes among the plurality of first touch electrodes C1 to emit light.

[0106] For example, the erasing unit 200 in the erasing tool 000 may further include a plurality of first touch signal lines C2 that are electrically connected to the plurality of first touch electrodes C1 in a one-to-one correspondence. The controller 205 may be electrically connected to the plurality of first touch electrodes C1 via the plurality of first touch signal lines C2.

[0107] In this situation, after the electronic writing tablet comes into contact with the transition area 202 of the erasing section 200 in the erasing tool 000, the electronic writing tablet absorbs a portion of the charge, causing a change in the capacitance of the area in the erasing section 200 that is in contact with the electronic writing tablet. This results in a change in the signal on the first touch electrode C1 in the area of ​​the erasing section 200 that is in contact with the electronic writing tablet. The controller 205 can identify the first touch electrode C1 whose signal has changed through multiple first touch signal lines C2. Then, the controller 205 can control the first point light source 2042 corresponding to this first touch electrode C1 whose signal has changed to emit light. Thus, after the transition area of ​​the erasing section 200 comes into contact with the electronic writing tablet, the first point light source 2042 in the erasing section 200 will only emit light towards the area in contact with the electronic writing tablet.

[0108] Optionally, if the controller 205 determines through multiple first touch signal lines C2 that the signal on the first touch electrode C1 that has undergone a signal change has recovered to the corresponding signal when it is not in contact, then the controller 205 can determine that the transition area 202 of the erasure section 200 is separated from the electronic writing tablet, and the controller 205 can control the previously lit first point light source 2042 to stop emitting light.

[0109] In this embodiment, both the first touch electrode C1 and the first touch signal line C2 in the erasure unit 200 are made of a conductive material with light transmittance. For example, both the first touch electrode C1 and the first touch signal line C2 are made of indium tin oxide (ITO) or indium zinc oxide (IZO). This ensures that the first point light source 2042 in the erasure unit 200 can normally emit light from the transition region 202.

[0110] It should be noted that, Figure 12 The example described is based on the case where the plurality of first touch electrodes C1 provided on the transition area 202 are located on the outer side of the cover 203 (that is, on the side of the cover 203 away from the support portion 100). In other possible implementations, the plurality of first touch electrodes C1 may also be located on the inner side of the cover 203 (that is, on the side of the cover 203 closer to the handheld portion 100). This application embodiment does not limit this.

[0111] It should also be noted that when multiple first touch electrodes C1 are located on the outside of the cover 203, a protective layer 206 is also required on the side of the multiple first touch electrodes C1 that is away from the cover 203.

[0112] For the second scenario, please refer to [the relevant documentation / reference]. Figure 14 , Figure 14 This is a cross-sectional view of another erasing section provided in this application embodiment at the transition region. The sensing structure 2021 may include a plurality of first pressure sensors Z1 arranged in an array. The arrangement of the plurality of first pressure sensors Z1 within the transition region 202 of the housing 203 can be referred to... Figure 5 , Figure 6 and Figure 7This application will not elaborate further on this. The plurality of first pressure sensors Z1 in the sensing structure 2021 can correspond to a plurality of first point light sources 2042. For example, the plurality of first pressure sensors Z1 can correspond one-to-one with the plurality of first point light sources 2042; or, each first pressure sensor Z1 can correspond to at least two first point light sources 2042; or, each first point light source 2042 can correspond to at least two first pressure sensors Z1. The controller 205 can be electrically connected to each of the first pressure sensors Z1. The controller 205 can be configured to control the first point light source 2042 corresponding to the first pressure sensor Z1 that detects pressure to emit light.

[0113] For example, the first pressure sensor Z1 disposed within the transition region 202 may include: a first electrode Z11, a piezoelectric material layer Z13, and a second electrode Z12 stacked along a direction perpendicular to and away from the erasing surface. The first electrode Z11 and the second electrode Z12 of each first pressure sensor Z1 are electrically connected to the controller 205. The controller 205 can apply a drive signal to the first electrode Z11. When a first pressure sensor Z1 is pressed, under the action of the piezoelectric material layer Z13 in that first pressure sensor Z1, the second electrode Z12 in that first pressure sensor Z1 will output a corresponding voltage signal. The controller 205 can determine the first pressure sensor Z1 that has been pressed by detecting the voltage signals output by each second electrode Z12.

[0114] In this situation, after the electronic writing tablet comes into contact with the transition area 202 of the erasing surface in the erasing tool 000, the controller 205 can determine the position of the first pressure sensor Z1 subjected to pressure by the voltage signal output from the second electrode Z12 in each of the first pressure sensors Z1. The position of the pressure sensor Z1 is the position of the area in the erasing unit 200 that contacts the electronic writing tablet. Then, the controller 205 can control the first point light source 2042 corresponding to this part of the first pressure sensor Z1 to emit light. Thus, after the transition area of ​​the erasing unit 200 contacts the electronic writing tablet, the first point light source 2042 in the erasing unit 200 will only emit light towards the area in contact with the electronic writing tablet.

[0115] In one scenario, after the controller 205 detects the pressing pressure through the first pressure sensor Z1, if the controller 205 determines that the pressing pressure detected by the first pressure sensor Z1 is greater than a preset pressure threshold, then the controller 205 can control the corresponding first point light source 2042 to emit light with a fixed intensity.

[0116] In another scenario, the pressure detected by the first pressure sensor Z1 needs to be positively correlated with the light intensity emitted by the corresponding first point light source 2042. In this case, after the controller 205 detects the pressure through the first pressure sensor Z1, the controller 205 needs to control the corresponding first point light source 2042 to emit light of the corresponding intensity based on the correspondence between the pressure detected by the first pressure sensor Z1 and the light intensity emitted by the corresponding first point light source 2042.

[0117] Optionally, if the controller 205 determines, through the voltage signal output by the second electrode Z12 in each of the first pressure sensors Z1, that the first pressure sensor Z1 that was previously pressed is no longer pressed, then the controller 205 can determine that the transition area 202 of the erasing surface is separated from the electronic writing tablet, and the controller 205 can control the first point light source 2042 that was previously lit to stop emitting light.

[0118] In this embodiment, the piezoelectric layer Z13 in the first pressure sensor Z1 can be composed of transparent piezoelectric materials such as polyvinylidene fluoride (PVDF or PVF2) and its copolymer poly(vinylidene-difluoride-trifluoroethylene) (P(VDF-TrFE)). This ensures that the first point light source 2042 in the erasure section 200 can normally exit from the transition region 202.

[0119] It should be noted that, Figure 14 The example described is based on the case where the multiple first pressure sensors Z1 disposed in the transition zone 202 are located on the outside of the cover 203 (that is, on the side of the cover 203 away from the support portion 100). In other possible implementations, the multiple first pressure sensors Z1 may also be located on the inside of the cover 203 (that is, on the side of the cover 203 closer to the handheld portion 100). This application embodiment does not limit this.

[0120] It should also be noted that when multiple first pressure sensors Z1 are located outside the cover 203, a protective layer 206 is also required on the side of the multiple first pressure sensors Z1 away from the cover 203.

[0121] In this embodiment, the controller 205 in the erasure unit 200 can control the operating state of the first point light source 2042 in the two situations described above. Regarding the controller 205's control of the operating state of the second point light source 2041, a sensing element can be provided in the central area 201 of the erasure surface, and this sensing element can be electrically connected to the controller 205. The controller 205 can determine whether the central area 201 is in contact with the electronic writing tablet using the sensing element. For example, after the controller 205 determines through the sensing element that the central area 201 of the erasure surface is in contact with the electronic writing tablet, the controller 205 can control the second point light source 2041 to emit light; after the controller 205 determines through the sensing element that the central area 201 of the erasure surface has separated from the electronic writing tablet, the controller 205 can control the second point light source 2041 to stop emitting light.

[0122] Optionally, the sensing element may include at least one second touch electrode and / or at least one second pressure sensor. The second touch electrode may operate on the same principle as the first touch electrode C1 in the first scenario described above, and the second pressure sensor may operate on the same principle as the first pressure sensor Z1 in the second scenario described above. Therefore, this application will not further describe the operating principles of the second touch electrode and the second pressure sensor.

[0123] In one exemplary implementation, multiple point light sources within the housing 203 are all attached to the inner side of the housing 203. For example, the light-emitting sides of multiple first point light sources 2042 among the multiple point light sources are all facing the transition region 202 of the erasing surface, and the light-emitting sides of multiple second point light sources 2041 among the multiple point light sources are facing the central region 201 of the erasing surface.

[0124] For example, both the first point light source 2042 and the second point light source 2041 can be located on the flexible circuit board, and the flexible circuit board can be positioned close to the inner side of the housing 203. In this way, the first point light source 2042 and the second point light source 2041 on the flexible circuit board can be attached to the inner side of the housing 203. In this case, as... Figure 12 As shown, this design ensures that the light emitted by the multiple first point light sources 2042 within the housing 203 exits only from the transition area 202 of the housing 203 and does not exit towards the central area 201; similarly, it ensures that the light emitted by the second point light source 2041 within the housing 203 exits only from the central area 201 of the housing 203 and does not exit towards the transition area 201. Thus, it ensures that the light emitted by the erasing unit 200 only targets the erasing area in contact with the electronic writing tablet and does not target the non-erasing area of ​​the electronic writing tablet, thereby ensuring high erasing accuracy of the electronic writing tablet.

[0125] It should be noted that a collimation structure can be set for each point light source to ensure that each point light source can emit light perpendicularly through the corresponding collimation structure, thereby further improving the erasing accuracy of the electronic writing tablet.

[0126] In another exemplary implementation, the point light source within the housing 203 includes a light-emitting device and a collimation structure located on the light-emitting side of the light-emitting device. The collimation structure is used to adjust the light-emitting angle of the light-emitting device so that the light emitted by the point light source exits perpendicularly from the erasing surface. In this case, the point light source within the housing 203 does not need to be attached to the inner side of the housing 203.

[0127] For example, please refer to Figure 15 , Figure 15 This is a schematic diagram of the structure of a first point light source provided in an embodiment of this application. It includes a first light-emitting device L1 and a first collimation structure M1 located on the light-emitting side of the first light-emitting device L1. The first collimation structure M1 is used to adjust the light-emitting angle of the first light-emitting device L1 so that the light emitted by the first point light source 2042 exits perpendicularly from the transition area 202 of the erasing surface.

[0128] For example, to ensure that the light emitted by the erasing tool 000 does not shine onto the non-contact area, it is necessary to ensure that the light emitted by the point light source 2041 in the erasing tool 000 is perpendicular to the contact surface between the erasing tool 000 and the display surface of the electronic writing tablet. However, the light emitted by the first light-emitting device L1 is usually divergent and propagates in various directions. Therefore, a first collimation structure M1 can be used to adjust the divergent light emitted by the first light-emitting diode L1, so that the adjusted light can be emitted perpendicularly from the transition area 202 of the erasing surface. Here, the first collimation structure M1 can be a concave reflector or a light-transmitting group composed of multiple lenses; this application does not limit this.

[0129] Please refer to Figure 16 , Figure 16 This is a schematic diagram of a plurality of second point light sources provided in an embodiment of this application. The plurality of second point light sources 2041 in the housing 203 include: a plurality of second light-emitting devices L2 arranged in an array, and a second collimation structure M2 located on the light-emitting side of the plurality of second light-emitting devices L2. The second collimation structure M2 is used to adjust the light-emitting angle of the plurality of second light-emitting devices L2 so that the light emitted by the plurality of second point light sources 2041 is emitted perpendicularly from the central region 201. It should be noted that the plurality of second light-emitting devices L2 in the plurality of second point light sources 2041 can emit light simultaneously under the control of the controller 205. In this case, the plurality of second point light sources 2041 can also be referred to as surface light sources.

[0130] For example, since the central area 201 of the erasing surface has a large area, the second point light source 2041 is composed of multiple arrayed second light-emitting devices L2. Similarly, to ensure that the light emitted from the second point light source 2041 is perpendicular to the central area 201, a concave reflector or a light-transmitting group composed of multiple lenses can be used as the second collimation structure M2 to adjust the light emitted by the second light-emitting devices L2. In this application, Figure 16 This explanation uses the second collimation structure M2 as an example, which is a lens.

[0131] In the embodiments of this application, the first light-emitting device L1 and the second light-emitting device L2 can both be organic light-emitting diodes (OLEDs), quantum dot light-emitting diodes (QLEDs), light-emitting diodes (LEDs), or micro LEDs, etc. This application does not limit the specific type of light-emitting device.

[0132] In other possible implementations, the light source 204 in the erasure unit 200 can be composed of an optical fiber and a light-emitting device. The end of the optical fiber can face inwards towards the housing 203, and the light-emitting device can face towards the tail of the optical fiber. In this way, the light emitted by the light-emitting device can travel from the tail of the optical fiber to the end of the optical fiber, and then pass through the housing 203 before exiting.

[0133] In a third optional implementation, the erasing part 200 of the erasing tool 000 is both conductive and capable of emitting light. In this case, the erasing tool 000 can be adapted to electronic writing tablets with touch electrode layers, electronic writing tablets with photosensitive components, and electronic writing tablets based on the principle of light erasure. For the structure of the erasing tool 000 and its principle of adaptation to various electronic writing tablets, please refer to the two optional implementations mentioned above; this application will not elaborate further.

[0134] In summary, the erasing tool provided in this application includes a support portion and an erasing portion fixedly connected to the support portion. The side of the erasing portion away from the support portion is the erasing surface, which has a transition zone. The contact area between the sensing structure in the transition zone and the display surface of the electronic writing tablet is typically small, and when the transition zone in the erasing surface contacts the display surface of the electronic writing tablet, only a portion of the sensing structure in the transition zone contacts the display surface. Therefore, by using the partial sensing structure in the transition zone of the erasing surface, a small area of ​​writing on the electronic writing tablet can be erased, effectively improving the effect of local erasing on the liquid crystal writing tablet.

[0135] Furthermore, when the erasing surface has both a transition area and a central area, the area of ​​the central area is much larger than the area of ​​the transition area. Therefore, when a user needs to erase a large area of ​​writing on the LCD writing tablet using the erasing tool, the central area of ​​the erasing tool's erasing surface can be made to contact the display surface of the electronic writing tablet. When a user needs to erase a small area of ​​writing on the electronic writing tablet using the erasing tool, the sensing structure within the transition area of ​​the erasing tool's erasing surface can be made to contact the display surface of the electronic writing tablet. This further improves the effectiveness of partial erasing on the LCD writing tablet.

[0136] This application also provides a handwriting system, please refer to... Figure 17 , Figure 17 This is a schematic diagram of a handwriting system provided in an embodiment of this application. The handwriting system may include: an erasing tool 000 and an electronic writing tablet. For example, the erasing tool 000 may be the one described above. Figure 3 , Figure 4 and Figure 12 For any of the erasure tools 000 shown, the electronic writing tablet can be an electronic writing tablet adapted to any of the erasure tools 000 described above. For example, the following embodiments are illustrated using a liquid crystal writing tablet 111 as an example.

[0137] The liquid crystal writing tablet 111 may include: a first substrate 010 and a second substrate 011 disposed opposite to each other, and a liquid crystal layer 012 located between the first substrate 010 and the second substrate 011. The liquid crystal layer 012 may be a bistable liquid crystal molecule layer, that is, the liquid crystal molecules in the liquid crystal layer 012 are bistable liquid crystal molecules.

[0138] In this embodiment, the bistable liquid crystal molecules in the bistable liquid crystal layer are configured such that, after the second substrate 011 is subjected to external pressure, they change from a focal conic texture to a planar texture. For example, when the liquid crystal writing tablet 111 is in writing mode, if a writing tool applies a certain pressure to the second substrate 011, some of the bistable liquid crystal molecules in the liquid crystal layer 012 of the liquid crystal writing tablet 111 change from a focal conic 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 illuminating the liquid crystal writing tablet 111, so that the liquid crystal writing tablet 111 can display the corresponding handwriting.

[0139] The first substrate 010 in the liquid crystal handwriting tablet 111 may include: a first substrate 0101 and a plurality of pixel electrodes 0102 located on one side of the first substrate 010; the second substrate 011 in the liquid crystal handwriting tablet 111 may include: a second substrate 0111 and a common electrode 0112 located on one side of the second substrate 0111.

[0140] The first substrate 0101 in the first substrate 010 can be a rigid substrate. This ensures good overall rigidity of the liquid crystal writing tablet 111. For example, the second substrate 201 can be a glass substrate. The second substrate 0111 in the second substrate 011 can be a flexible substrate, and the material of the second substrate 0111 can include polyethylene terephthalate (PET). This ensures that the applied pressure can control the bistable liquid crystal molecules to change from a focal cone texture to a planar texture.

[0141] The materials of the pixel electrode 0102 in the first substrate 010 and the common electrode 0112 in the second substrate 011 can both include transparent conductive materials such as ITO or IZO. This ensures that light can pass through the liquid crystal handwriting tablet 111.

[0142] The LCD handwriting tablet 111 can be configured such that: after the erasing part 200 of the erasing tool 000 contacts the second substrate 011, the area in contact between the erasing part 200 and the second substrate 011 is defined as the area to be erased, and a pixel voltage is applied to the pixel electrode 0102 in the area to be erased, so that a voltage difference is formed between the pixel electrode 0102 and the common electrode 0112 in the area to be erased.

[0143] In this embodiment, the bistable liquid crystal molecules are further configured to transform from a planar texture to a focal conical texture after a voltage difference is formed between the pixel electrode 0102 and the common electrode 0112 in the erased pixel area. For example, when the liquid crystal writing tablet 111 is in erase mode, if the erasing part 200 of the erasing tool 000 contacts the area of ​​the writing on the liquid crystal writing tablet, the liquid crystal writing tablet can determine the position of the contact area between the erasing part 200 and the display surface of the liquid crystal writing tablet, and determine the position of the contact area as the position of the area to be erased. After determining the position information of the area to be erased, the liquid crystal writing tablet 111 can apply a pixel voltage to the pixel electrode 0102 in the pixel area to be erased, causing a voltage difference to be formed between the pixel electrode 0102 and the common electrode 0112 in the pixel area to be erased, thereby causing the liquid crystal molecules in the area to be erased to rearrange under the action of the voltage difference, that is, the liquid crystal molecules can transform from a planar texture to a focal conical texture. In this way, the liquid crystal molecules that have transformed into a focal cone texture can transmit ambient light, thereby erasing the writing marks in the area to be erased.

[0144] In the embodiments of this application, the structures of the liquid crystal writing tablets 111 adapted to different types of erasing tools 000 vary. Therefore, the embodiments of this application will describe the following two possible implementation methods as examples.

[0145] In the first possible implementation, when the erasing part 200 of the erasing tool 000 and the sensing structure 2021 are an integral structure and made of a conductive material, that is, when the erasing tool 000 has the structure shown in the first optional implementation of the above embodiments, please refer to... Figure 18 , Figure 18 This is a schematic diagram of the film layer structure of a liquid crystal handwriting tablet provided in this application. The second substrate 011 in the liquid crystal handwriting tablet 111 further includes: a touch electrode layer 0113 located on one side of the second substrate 0111, and a first insulating layer 0114 located between the touch electrode layer 0113 and the common electrode 0112, wherein the touch electrode layer 0113 is closer to the second substrate 0111 than the common electrode 0112.

[0146] The LCD handwriting tablet 111 is configured to detect the position information of the area to be erased by the touch electrode layer 0113 after the erasing part 200 contacts the second substrate 011.

[0147] In the embodiments of this application, please refer to Figure 19 , Figure 19This is a top view of a liquid crystal writing tablet provided in this application. The touch electrode layer 0113 in the liquid crystal writing tablet 111 may include a plurality of touch electrode blocks 0113a. The orthographic projection of the touch electrode block 0113a in the touch electrode layer 0113 onto the second substrate 0111 overlaps with the orthographic projection of at least one pixel electrode 0102 onto the second substrate 0111. For example, each touch electrode block 0113a may correspond to at least one pixel electrode 0102, and the orthographic projection of each pixel electrode 0102 onto the second substrate 0111 is located within the orthographic projection of the corresponding touch electrode block 0113a onto the second substrate 0111.

[0148] In the embodiments of this application, such as Figure 19 As shown, the second substrate 011 in the liquid crystal handwriting tablet 111 may further include: multiple touch signal lines Tx. The multiple touch signal lines Tx can be electrically connected to multiple touch electrode blocks 0113a in a one-to-one correspondence.

[0149] For example, the liquid crystal writing tablet 111 can simultaneously apply touch signals to multiple touch signal lines Tx. After an external object (e.g., an erasing tool) comes into contact with the first substrate 100 in the liquid crystal writing tablet 111, the external object absorbs a portion of the charge in the liquid crystal writing tablet 111, causing a change in the capacitance between the touch electrode block 0113a and the common electrode 01112 in the contact area between the external object and the second substrate 011. This, in turn, causes a change in the touch signal loaded on the touch signal line Tx connected to the touch electrode block 0113a in the contact area. The liquid crystal writing tablet 111 can locate the position of the contact area between the external object and the second substrate 011 by sensing the touch signal line Tx where the touch signal changes.

[0150] For example, the orthographic projection of pixel electrode 0102 on the first substrate 0101 does not coincide with the orthographic projection of touch signal line Tx on the first substrate 0101, ensuring that the touch signal loaded on touch signal line Tx will not interfere with the pixel voltage loaded on pixel electrode 0102. In this application, multiple pixel electrodes 0102 in the liquid crystal handwriting tablet 111 can be arranged in an array, and at least one touch signal line Tx can be arranged between two adjacent columns of pixel electrodes 0102.

[0151] In the embodiments of this application, please refer to Figure 19 and Figure 20 , Figure 20This is a schematic diagram of the film layer structure of a second substrate provided in an embodiment of this application. The second substrate 011 in the liquid crystal handwriting tablet 111 may further include a second insulating layer 0115 located between the second substrate 0111 and the touch electrode layer 0113, wherein the second insulating layer 0115 has a plurality of vias V. The touch signal line Tx is electrically connected to the corresponding touch electrode block 102a through at least one via V.

[0152] Example, Figure 19 The following is a schematic illustration using the example of each touch signal line Tx in the second substrate 011 being electrically connected to the corresponding touch electrode block 102a through a second via V.

[0153] It should be noted that the materials of the touch electrode layer 0113 and the touch signal line Tx in the LCD handwriting tablet 111 can include transparent conductive materials such as ITO or IZO.

[0154] In this embodiment, when the liquid crystal writing tablet is in erase mode, the conductive erasing part 200 can contact the second substrate 011 of the liquid crystal writing tablet 111. By providing a touch electrode layer 0113 in the second substrate 011, the position of the contact area between the erasing part 200 and the second substrate 011 can be determined, thereby determining the position information of the area to be erased in the liquid crystal writing tablet 111. Then, the liquid crystal writing tablet 111 applies a pixel voltage to the pixel electrode 0102 in the area to be erased, creating a voltage difference between the pixel electrode 0102 and the common electrode 0112 in 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 tablet rearrange, that is, the liquid crystal molecules can change from a planar texture to a focal conic texture. In this way, the liquid crystal molecules that have changed to a focal conic texture can transmit incident ambient light, thereby enabling the handwriting system to erase handwriting in a local area.

[0155] In the second possible implementation, when the erasing part 200 of the erasing tool 000 includes a housing 203 and a light source 204 located within the housing 203, that is, the erasing tool 000 has the structure shown in the second optional implementation of the above embodiments. Please refer to [reference needed]. Figure 21 , Figure 21 This is a schematic diagram of the film layer structure of another liquid crystal writing tablet provided in this application. The liquid crystal writing tablet 111 also includes a photosensitive component 013. The liquid crystal writing tablet 111 is configured such that after the erasing part 200 contacts the second substrate 011 and the light source 204 emits light to the contact area between the erasing part 200 and the second substrate 011, the photosensitive component 013 detects the position information of the area to be erased.

[0156] In this embodiment, the first substrate 010 has multiple pixel regions, and each pixel region may have a pixel electrode 0102 arranged therein. The photosensitive component 013 in the liquid crystal handwriting tablet 111 has multiple photosensitive elements 013a, each photosensitive element 013a corresponding to at least one pixel region, and the orthographic projection of the photosensitive element 013a on the first substrate 010 at least partially overlaps with the corresponding at least one pixel region. In this application, each photosensitive element 013a in the photosensitive component 013 may correspond to at least one pixel region.

[0157] For example, when it is necessary to erase the handwriting displayed on the LCD handwriting pad 111, an erasing tool 000 capable of emitting light can be used to erase the handwriting. After the erasing tool 000 contacts the second substrate 011, and the light source 204 emits light towards the contact area between the erasing part 200 and the second substrate 011, the photosensitive element 013a in the photosensitive component 013 can sense the light emitted by the erasing tool 000 and transmitted through the LCD handwriting pad 111, and detect the position information of the area to be erased through the photosensitive component 013. The LCD handwriting pad 111 erases the handwriting in the pixel area to be erased according to the position of the pixel area to be erased.

[0158] For example, the LCD handwriting tablet 111 can sense the light emitted by the erasing tool 000 through a photosensitive element 013a in the photosensitive assembly 013, and determine the position of the pixel area corresponding to that photosensitive element by using the correspondence between the photosensitive element 013a and the pixel area. Thus, based on the position of the pixel area corresponding to that photosensitive element, the LCD handwriting tablet 111 can determine the position information of the light illuminating the LCD handwriting tablet 111, thereby obtaining the position information of the pixel area to be erased.

[0159] It should be noted that the photosensitive component 013 can be separately disposed from the first substrate 010 in the liquid crystal handwriting tablet 111, or it can be integrated into the first substrate 010. When the photosensitive component 013 is separately disposed from the first substrate 010, the photosensitive component 013 may include: a circuit board located on the side of the first substrate 010 away from the second substrate 011, and a plurality of photosensitive elements 013a arranged in an array on the circuit board, wherein the photosensitive elements 013a can be photoresistors, photodiodes, or phototransistors. When the photosensitive component 013 is integrated into the first substrate 010, the plurality of photosensitive elements 013a in the photosensitive component 013 are all phototransistors, and each phototransistor is distributed within a pixel area.

[0160] In this embodiment, when the liquid crystal writing tablet is in erase mode, the erasing part 200 with light-emitting properties can contact the second substrate 011 of the liquid crystal writing tablet 111. By providing a photosensitive component 013 in the liquid crystal writing tablet 111, the position of the contact area between the erasing part 200 and the second substrate 011 can be determined, thereby determining the position information of the area to be erased in the liquid crystal writing tablet 111. Then, the liquid crystal writing tablet 111 applies a pixel voltage to the pixel electrode 0102 in the pixel area to be erased, creating a voltage difference between the pixel electrode 0102 and the common electrode 0112 in the pixel 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 tablet rearrange, that is, the liquid crystal molecules can change from a planar texture to a focal conic texture. In this way, the liquid crystal molecules that have changed to a focal conic texture can transmit incident ambient light, thereby realizing the erasing function of handwriting in a local area by the handwriting system.

[0161] Optionally, when a pressure sensor (i.e., a first pressure sensor located in the transition zone and a second pressure sensor located in the central zone) is provided within the erasing surface of the erasing unit 200, the erasing unit 200 can detect different pressing pressures through the pressure sensors and control the light source to emit light of different intensities according to different pressing pressures. For example, the pressing pressure detected by the pressure sensor can be positively correlated with the light intensity emitted by the light source. Therefore, when the LCD handwriting tablet is in erasing mode, the user can apply different pressing pressures to the erasing unit 200 of the erasing tool 000, so that the light source in the erasing unit can emit light of different intensities, thereby enabling the LCD handwriting tablet 111 to achieve different erasing effects on the erasing area.

[0162] For example, the liquid crystal writing tablet 111 can also detect the light intensity emitted by the erasing section 200 through the photosensitive component 013, and can apply different pixel voltages to the pixel electrodes 0102 in the erasing area according to the light intensity emitted by the erasing section 200. For example, when the light intensity detected by the liquid crystal writing tablet 111 through the photosensitive component 013 is strong, the liquid crystal writing tablet 111 applies a larger pixel voltage to the pixel electrodes 0102 in the erasing area, and at this time, the degree of erasure of the writing in the erasing area is higher; when the light intensity detected by the liquid crystal writing tablet 111 through the photosensitive component 013 is weak, the liquid crystal writing tablet 111 applies a smaller pixel voltage to the pixel electrodes 0102 in the erasing area, and at this time, the degree of erasure of the writing in the erasing area is lower.

[0163] In this way, by applying different pressures to the erasing tool 000, users can erase the handwriting displayed on the LCD handwriting tablet 111 to different degrees.

[0164] 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.

[0165] 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.

[0166] 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. An erasing tool, characterized in that, include: A support portion, and an erasing portion fixedly connected to the support portion; The side of the erasing part away from the support part is the erasing surface. The erasing surface has a transition area. A sensing structure is provided in the transition area of ​​the erasing surface. The sensing structure is used to contact the display surface of the electronic writing tablet so that the electronic writing tablet can erase the writing marks in the contact area with the sensing structure. The eraser surface has an arc-shaped convex surface within the transition zone; the eraser surface also has a central area, and the portion of the eraser surface within the central area is a plane, with the arc-shaped convex surface distributed around the plane; the contact area between the transition zone and the display surface of the electronic writing tablet is smaller than the contact area between the central area and the display surface of the electronic writing tablet; when the transition zone contacts the display surface of the electronic writing tablet, a portion of the sensing structure within the transition zone contacts the display surface of the electronic writing tablet.

2. The erasing tool according to claim 1, characterized in that, The portion of the erasing section located within the transition zone is configured to deform upon being subjected to pressure.

3. The erasing tool according to any one of claims 1 to 2, characterized in that, At least a portion of the erasing portion is integral with the sensing structure and is made of a conductive material; Alternatively, at least a portion of the erasing portion may include the sensing structure, which includes a pressure-deformed structure and a conductive layer located outside the pressure-deformed structure.

4. The erasing tool according to claim 3, characterized in that, The sensing structure includes: a plurality of protrusions arranged in an array, wherein some of the protrusions are configured to change the relative positions of the different protrusions after being subjected to pressure; Wherein, when the sensing structure includes a pressure-deformed structure, the pressure-deformed structure includes the protrusion.

5. The erasing tool according to any one of claims 1 to 2, characterized in that, The wiping unit includes: a housing, and a light source located inside the housing, the housing having the wiping surface.

6. The erasing tool according to claim 5, characterized in that, The light source includes: multiple point light sources, and the erasing unit further includes: a controller located inside the housing, the controller being electrically connected to each of the point light sources; The controller is configured to, after the erasing surface comes into contact with the display surface of the electronic writing tablet, control a portion of the multiple point light sources to emit light toward the contact area between the erasing surface and the display surface of the electronic writing tablet.

7. The erasing tool according to claim 6, characterized in that, The sensing structure includes: a plurality of first touch electrodes arranged in an array, the plurality of first touch electrodes corresponding to the plurality of point light sources; and the controller being electrically connected to each of the first touch electrodes. The controller is configured to control the point light source corresponding to the first touch electrode whose signal changes among the plurality of first touch electrodes to emit light.

8. The erasing tool according to claim 6, characterized in that, The sensing structure includes: a plurality of first pressure sensors arranged in an array, the plurality of first pressure sensors corresponding to the plurality of point light sources; and the controller being electrically connected to each of the first pressure sensors. The controller is configured to control the point light source corresponding to the first pressure sensor among the plurality of first pressure sensors that detects the pressing pressure to emit light.

9. The erasing tool according to any one of claims 6 to 8, characterized in that, The erasing surface also has a central region, in which a sensing element is disposed. The sensing element is electrically connected to the controller, and the sensing element includes: at least one second touch electrode and / or at least one second pressure sensor.

10. The erasing tool according to any one of claims 6 to 8, characterized in that, The light-emitting sides of the multiple point light sources are all attached to the inner side of the housing.

11. The erasing tool according to any one of claims 6 to 8, characterized in that, The point light source includes: a light-emitting device, and a collimation structure located on the light-emitting side of the light-emitting device. The collimation structure is used to adjust the light-emitting angle of the light-emitting device so that the light emitted by the point light source is emitted perpendicularly from the erasing surface.

12. A handwriting system, characterized in that, include: The electronic writing tablet and the erasing tool according to any one of claims 1 to 11.

13. The handwriting system according to claim 12, characterized in that, The electronic handwriting tablet includes: a first substrate and a second substrate disposed opposite to each other, and a bistable liquid crystal molecule layer located between the first substrate and the second substrate; The first substrate includes: a first substrate and a plurality of pixel electrodes located on one side of the first substrate; the second substrate includes: a second substrate and a common electrode located on one side of the second substrate; The electronic handwriting tablet is configured such that, after the erasing part of the erasing tool contacts the second substrate, the area in contact between the erasing part and the second substrate is defined as the area to be erased, and a pixel voltage is applied to the pixel electrode in the area to be erased, so that a voltage difference is formed between the pixel electrode in the area to be erased and the common electrode.

14. The handwriting system according to claim 13, characterized in that, When the erasing part and the sensing structure are integrally formed and made of a conductive material, the second substrate further includes: a touch electrode layer located on one side of the second substrate, and a first insulating layer located between the touch electrode layer and the common electrode, wherein the touch electrode layer is closer to the second substrate than the common electrode; The electronic writing tablet is configured to detect the position information of the area to be erased through the touch electrode layer after the erasing part contacts the second substrate.

15. The handwriting system according to claim 13, characterized in that, When the erasing unit includes a housing and a light source located within the housing, the electronic writing tablet further includes a photosensitive component; The electronic writing tablet is configured such that, after the erasing part contacts the second substrate and the light source emits light to the contact area between the erasing part and the second substrate, the photosensitive component detects the position information of the area to be erased.

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