CN116185214A

CN116185214A - Erasing tool and handwriting system

Info

Publication number: CN116185214A
Application number: CN202111422024.2A
Authority: CN
Inventors: 王家星; 王修亮; 王建; 武晓娟; 袁洪亮; 宋泽宇; 毕谣; 段金帅; 葛杨; 柳峰; 陈翠玉; 韩天洋
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2023-05-30

Abstract

The application discloses an erasing tool and a handwriting system, and belongs to the technical field of display. An erasure tool, comprising: the device comprises a supporting part and an erasing part fixedly connected with the supporting part. One surface of the erasing part far away from the supporting part is an erasing surface, and the erasing surface is provided with a transition area. The area of the sensing structure arranged in the transition area, which is contacted with the display surface of the electronic handwriting board, is usually smaller, and when the transition area in the erasing surface is contacted with the display surface of the electronic handwriting board, only part of the sensing structure in the transition area is contacted with the display surface of the electronic handwriting board. Therefore, the small-area erasing of the handwriting presented by the electronic handwriting board can be realized through the partial induction structure in the transition area in the erasing surface, and the effect of the liquid crystal handwriting board during the partial erasing is effectively improved.

Description

Erasing tool and handwriting system

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to an erasing tool and a handwriting system.

Background

A handwriting board is an electronic device for realizing writing and drawing of characters. Among them, the liquid crystal handwriting board has the advantages of low power consumption and clear handwriting, and has taken up a lot of market share in recent years.

In order to be able to locally erase the writing displayed by the liquid crystal handwriting board, an infrared positioning device needs to be integrated in the liquid crystal handwriting board. When the handwriting displayed on the liquid crystal handwriting board is erased by adopting an erasing tool (such as an blackboard eraser), the contact position of the erasing tool and the liquid crystal handwriting board can be determined by an infrared positioning device so as to determine the area to be erased in the liquid crystal handwriting board. Then, the liquid crystal handwriting board can control the pixel electrode in the area to be erased so as to erase the writing trace in the area to be erased.

However, the area of the contact area between the erasing tool and the liquid crystal writing pad is generally large, resulting in poor effect when the liquid crystal writing pad is locally erased.

Disclosure of Invention

The embodiment of the application provides an erasing tool. The problem of the relatively poor effect of prior art's liquid crystal handwriting pad when carrying out the local erasure can be solved, technical scheme is as follows:

in one aspect, an erasure tool is provided, comprising: a supporting part and an erasing part fixedly connected with the supporting part;

the one side of erasing portion far away from supporting part is the face of erasing, the face of erasing has the transition district, be provided with the induction structure in the transition district of face of erasing, the induction structure is used for with the display surface contact of electronic handwriting board, so that the electronic handwriting board erase with the handwriting in the contact area of induction structure.

Optionally, a portion of the erase portion within the transition region is configured to deform upon being subjected to pressure.

Optionally, a portion of the erasing surface located in the transition area is an arc-shaped convex surface.

Optionally, the erasing surface further has a central area, a portion of the erasing surface located in the central area is a plane, and the arc-shaped convex surface is distributed around the plane.

Optionally, at least part of the erasing part is integrated with the sensing structure and is made of a material with conductivity;

alternatively, at least part of the erasing part comprises the sensing structure, and the sensing structure comprises a pressed deformation structure and a conductive layer positioned outside the pressed deformation structure.

Optionally, the sensing structure includes: a plurality of protrusions arranged in an array, a portion of the plurality of protrusions being configured to change relative positions between different protrusions upon being subjected to a pressure;

wherein, when the sensing structure comprises a pressed deformation structure, the pressed deformation structure comprises the protrusion.

Optionally, the erasing part includes: a housing, and a light source within the housing, the housing having the wiping surface.

Optionally, the light source includes: a plurality of point light sources, the erasing part further includes: a controller located within the housing, the controller being electrically connected to the respective light sources and the point light sources;

wherein the controller is configured to: and after the erasing surface is contacted with the display surface of the electronic handwriting board, controlling part of point light sources in the plurality of point light sources to emit light to the contact area of the erasing surface and the display surface of the electronic handwriting board.

Optionally, the sensing structure includes: the first touch electrodes are arranged in an array mode, and the first touch electrodes correspond to the point light sources; the controller is electrically connected with each first touch electrode;

the controller is configured to: and controlling point light sources corresponding to the first touch electrodes with signals changed in the plurality of first touch electrodes to emit light.

Optionally, the sensing structure includes: the first pressure sensors are arranged in an array mode, and the first pressure sensors correspond to the point light sources; the controller is electrically connected with each first pressure sensor; the controller is configured to: and controlling point light sources corresponding to the first pressure sensors which detect the pressing force in the plurality of first pressure sensors to emit light.

Optionally, the erasing surface further has a central area, and a sensing element is disposed in the central area of the erasing surface, and is electrically connected with the controller, and the sensing element includes: at least one second touch electrode and/or at least one second pressure sensor.

Optionally, the light emitting sides of the plurality of point light sources are attached to the inner side of the housing.

Optionally, the point light source includes: the light source comprises a light emitting device and a collimation structure positioned on the light emitting side of the light emitting device, wherein the collimation structure is used for adjusting the light emitting angle of the light emitting device so that light rays emitted by the point light source are emitted vertically from the erasing surface.

In another aspect, there is provided a handwriting system comprising: a liquid crystal writing pad and any of the above-described erasing tools.

Optionally, the electronic handwriting board includes: a first substrate and a second substrate disposed opposite to each other, and a bistable liquid crystal molecular layer between the first substrate and the second substrate;

the first substrate includes: a first substrate, and a plurality of pixel electrodes located at one side of the first substrate; the second substrate includes: a second substrate, and a common electrode at one side of the second substrate;

Wherein the electronic writing pad is configured to: after the erasing part of the erasing tool is contacted with the second substrate, determining the contact area of the erasing part and the second substrate as an area to be erased, and applying 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.

Optionally, when the erasing part and the sensing structure are integrally formed and made of a material having conductivity, the second substrate further includes: a touch electrode layer located at one side of the second substrate, and a first insulating layer located between the touch electrode layer and the common electrode, the touch electrode layer being closer to the second substrate than the common electrode;

the liquid crystal handwriting board is configured to: after the erasing part is contacted with the second substrate, the position information of the area to be erased is detected through the touch electrode layer.

Optionally, when the erasing part includes: the housing, and when being located the light source in the housing, the liquid crystal handwriting board still includes: a photosensitive component;

the liquid crystal handwriting board is configured to: after the erasing part is contacted with the second substrate and the light source emits light to the contact area of the erasing part and the second substrate, the position information of the area to be erased is detected through the photosensitive component.

The beneficial effects that technical scheme that this application embodiment provided include at least:

in summary, the erasing tool provided in the embodiment of the present application includes: the device comprises a supporting part and an erasing part fixedly connected with the supporting part. One surface of the erasing part far away from the supporting part is an erasing surface, and the erasing surface is provided with a transition area. The area of the sensing structure arranged in the transition area, which is contacted with the display surface of the electronic handwriting board, is usually smaller, and when the transition area in the erasing surface is contacted with the display surface of the electronic handwriting board, only part of the sensing structure in the transition area is contacted with the display surface of the electronic handwriting board. Therefore, the small-area erasing of the handwriting presented by the electronic handwriting board can be realized through the partial induction structure in the transition area in the erasing surface, and the effect of the liquid crystal handwriting board during the partial erasing is effectively improved.

Further, when the erase surface has not only the transition region but also the central region, the area of the central region in the erase surface is much larger than the area of the transition region. Therefore, when a user needs to erase writing on the liquid crystal handwriting board in a large area through the erasing tool, the central area in the erasing surface of the erasing tool can be contacted with the display surface of the electronic handwriting board. When a user needs to erase writing on the electronic handwriting board in a small area through the erasing tool, partial sensing structures in transition in the erasing surface of the erasing tool can be contacted with the display surface of the electronic handwriting board. Thus, the effect of the liquid crystal handwriting board when in local erasing can be further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

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

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

FIG. 3 is a schematic view of an erasing tool according to one embodiment of the present application;

FIG. 4 is a schematic diagram of another erase tool according to an embodiment of the present disclosure;

fig. 5 is a schematic distribution diagram of a plurality of sensing structures arranged in an array according to an embodiment of the present application;

FIG. 6 is a schematic diagram illustrating a distribution of a plurality of sensing structures arranged in an array according to another embodiment of the present disclosure;

FIG. 7 is a schematic distribution diagram of a plurality of sensing structures arranged in an array according to another embodiment of the present disclosure;

FIG. 8 is a partial schematic diagram of a sensing structure of an erase portion in a transition region according to an embodiment of the present application;

FIG. 9 is a schematic view of a protrusion distribution of a pressed deformation structure according to another embodiment of the present application;

FIG. 10 is a schematic illustration of the distribution of protrusions of another compression set provided in another embodiment of the present application;

FIG. 11 is a schematic illustration of the distribution of protrusions of yet another pressed deformation structure provided in another embodiment of the present application;

FIG. 12 is a schematic view of another erase tool according to an embodiment of the present disclosure;

FIG. 13 is a cross-sectional view of an erase portion at a transition area provided in an embodiment of the present application;

FIG. 14 is a cross-sectional view of another erase portion at a transition area provided in an embodiment of the present application;

fig. 15 is a schematic structural diagram of a first point light source according to an embodiment of the present application;

fig. 16 is a schematic structural view of a plurality of second point light sources according to an embodiment of the present disclosure;

fig. 17 is a schematic structural diagram of a handwriting system according to an embodiment of the present application;

fig. 18 is a schematic diagram of a film structure of a liquid crystal handwriting board provided in the present application;

FIG. 19 is a top view of a liquid crystal handwriting board according to an embodiment of the present disclosure;

fig. 20 is a schematic diagram of a film structure of a second substrate according to an embodiment of the present disclosure;

fig. 21 is a schematic diagram of a film structure of another liquid crystal handwriting board provided in the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

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

Wherein, the liquid crystal panel 01 may include: a first substrate 011 and a second substrate 012 which are disposed opposite to each other, and a liquid crystal layer 013 therebetween. The first substrate 011 typically has a plurality of pixel electrodes (not shown) 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.

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

When the liquid crystal handwriting board 00 is in the erasing mode, the erasing tool 03 moves on the liquid crystal panel 01, the liquid crystal handwriting board 00 determines the position of the erasing tool 03 on the liquid crystal panel 01 through infrared light emitted by the infrared positioning device 03, and then the area to be erased can be determined in the liquid crystal handwriting board 00. Then, the liquid crystal handwriting board can apply voltage to the pixel electrode in the area to be erased, so that a voltage difference can be formed between the pixel electrode in the area to be erased and the common electrode 1021, and further the liquid crystal molecules in the area to be erased are rearranged under the action of the voltage difference, namely, the liquid crystal molecules can be converted from a planar texture to a focal conic texture. Therefore, the liquid crystal molecules converted into the focal conic texture can transmit the incident ambient light, so that the area to be erased can display the background color with the liquid crystal handwriting board, and further the handwriting in the area to be erased is erased.

However, since the volume of the erasing tool 03 is generally large, the area of the erasing tool 03 in contact with the liquid crystal panel 00 is generally large. Therefore, the area of the area to be erased determined by the infrared positioning device 02 in the liquid crystal handwriting board 00 is also larger, so that the erasing tool 03 cannot erase writing in a smaller area in the liquid crystal handwriting board 00. Thus, the liquid crystal handwriting board 00 has poor effect when being locally erased.

Referring to fig. 3 and fig. 4, fig. 3 is a schematic structural diagram of an erasing tool according to an embodiment of the present application, and fig. 4 is a schematic structural diagram of another erasing tool according to an embodiment of the present application. The erasure tool 000 can include: a supporting portion 100, and an erasing portion 200 fixedly connected to the supporting portion 100.

Wherein the supporting portion 100 is used for supporting the erasing portion 200. For example, when a user needs to erase writing on an electronic tablet by means of the erasing tool 000, the user may hold the supporting part 100 in the erasing tool 000 so that the erasing part 200 on the supporting part 100 is in contact with the display surface of the electronic tablet.

The erasing portion 200 of the erasing tool 000 has an erasing surface, which is far away from the supporting portion 100, and the erasing surface has a transition area 202, and a sensing structure 2021 (not shown in fig. 3 and 4) is disposed in the transition area 202, and the sensing structure 2021 is used for contacting with the display surface of the electronic writing pad, so that the electronic writing pad erases writing in a contact area with the sensing structure 2021.

In the embodiment of the present application, the area of the sensing structure 2021 disposed in the transition region 202 in the erasing surface of the erasing portion 200 contacting the display surface of the electronic writing board is generally smaller, and when the transition region 202 in the erasing surface contacts the display surface of the electronic writing board, only a portion of the sensing structure 2021 in the transition region 202 contacts the display surface of the electronic writing board. To this end, a small area erasure of writing presented by the electronic tablet may be achieved by the partial sensing structure 2021 within the transition region 202 in the erasure surface.

In other possible implementations, as shown in fig. 3 and 4, the erasing surface of the erasing part 200 has not only a transition area 202 but also a central area 201. Wherein the transition zone 202 in the wiping surface may be arranged around the central zone 201. In this case, the area of the transition region 202 of the erasing surface in contact with the display surface of the electronic writing pad is much smaller than the area of the central region 201 of the erasing surface in contact with the display surface of the electronic writing pad.

In this manner, when a user needs to erase writing on an electronic tablet over a large area with the erase tool 000, the center region 201 in the erase surface of the erase tool 000 can be brought into contact with the display surface of the electronic tablet. When a user desires to erase writing on an electronic tablet with a small area through erase tool 000, a portion of sense structures 2021 within transition 202 in the erase face of erase tool 000 may be brought into contact with the display face of the electronic tablet.

In the embodiment of the present application, after the erasing part 200 of the erasing tool 000 contacts with the display surface of the electronic writing board, the electronic writing board can determine the position of the contact area between the erasing part 200 and the display surface of the electronic writing board, and determine the position of the contact area as the position of the area to be erased. And then, the electronic handwriting board can drive a corresponding control circuit according to the position of the area to be erased, so that the handwriting in the area to be erased is erased.

The electronic handwriting board may be a liquid crystal handwriting board (e.g., a light energy blackboard), an electronic whiteboard, an electronic blackboard, or the like, which has writing and erasing functions, and the present application is not limited thereto.

In the embodiment of the present application, as shown in fig. 3 and 4, when the erasing surface of the erasing tool 000 has the transition area 202 and the central area 201, in order to meet different erasing requirements of a user, a portion of the erasing surface located in the central area 201 may be a plane, and a portion of the erasing surface located in the transition area 202 may be an arc-shaped convex surface. In this way, the area of the contact between the part of the central area 201 in the erasing surface and the display surface of the electronic writing pad is larger, so that the electronic writing pad can erase the writing traces in the erasing area with larger area by one-time erasing, and the efficiency of the electronic writing pad for erasing the writing traces in a large area range is higher. The area of the transition area 202 in the erasing surface, which is in contact with the display surface of the electronic writing pad, is smaller because the part of the erasing surface, which is positioned in the transition area 202, is an arc-shaped convex surface, so that the electronic writing pad can erase writing marks in the erasing area with smaller area, and further the efficiency of the electronic writing pad for erasing writing marks in a small area range is higher.

Fig. 3 shows a case where the entire erase tool 000 is square, and fig. 4 shows a case where the entire erase tool 000 is circular. In other possible implementations, the erasure tool 000 may also be hexagonal in shape overall, and the embodiments of the present application are not limited in shape.

It should be noted that fig. 3 and 4 only show the case where the erasing surface has both the transition area 202 and the central area 201. When the wiping surface has only the transition region 202, the wiping surface may be entirely convex in an arc shape, in which case the wiping portion 200 in the wiping tool 000 may be entirely hemispherical.

In this application, the portion of the erase portion 200 within the transition region 202 is configured to deform upon being subjected to pressure. By way of example, the portion of the erase portion 200 located within the transition region 202 is capable of deforming in a direction perpendicular to the transition region 202 upon being subjected to pressure. In this manner, after the portion of the erasing part 200 located in the transition area 202 is in contact with the display surface of the electronic writing board, the user can apply different pressing forces to the erasing tool 000, so that the portion in contact with the electronic writing board is deformed to different degrees by the different pressing forces. By way of example, when the pressing force applied by the user to the erasing tool 000 is large, the deformation of the portion of the erasing part 200 located in the transition area 202 is large, and the area of the transition area 202 in contact with the display surface of the electronic writing pad is large; when the pressing force applied to the erasing tool 000 by the user is small, the portion of the erasing part 200 located in the transition area 202 is deformed less, and the area of the transition area 202 in contact with the display surface of the electronic writing pad is small. Thus, by adjusting the pressing force applied to the erasing tool 000, the contact area between the portion of the erasing part 200 located in the transition area 202 and the electronic writing pad can be changed, and the erasing effect of the electronic writing pad on writing is further improved.

In the embodiment of the present application, the erasing part 200 in the erasing tool 000 has various structures, and the embodiment of the present application is schematically illustrated by taking the following three alternative implementation manners as examples:

in a first alternative implementation, the erasure tool 000 can be adapted to an electronic tablet having a touch electrode layer.

In one possible scenario, at least a portion of the erase portion 200 (e.g., the portion where the transition region 202 is located) of the erase tool 000 is integrally formed with the sense structure 2021. For example, the sensing structure 2021 and the erasing portion 200 are made of a material having conductivity. For example, the sensing structure 2021 and the erasing portion 200 may be integrally formed using an injection molding process. For example, the sensing structure 2021 may be made of a material having conductivity such as conductive foam, conductive rubber, or conductive fiber, and having a capability of deforming when subjected to pressure. In this case, the erasing part 200 having the conductive property may be used in cooperation with the touch electrode layer in the electronic writing pad. When the electronic writing board is in the erasing mode, the erasing part 200 in the erasing tool 000 contacts with the display surface of the electronic writing board, and the capacitance in the area of the electronic writing board contacting with the erasing part 200 changes. Thus, the electronic handwriting board can determine the area with the changed capacitance as the area to be erased through the touch electrode layer.

In the embodiment of the present application, when at least part of the erasing part 200 is formed as a unitary structure with the sensing structure 2021, and the unitary structure is made of a material having conductivity, the sensing structure 2021 may include a plurality of protrusions arranged in an array. Specifically, the protrusions can be connected with each other by adopting the same material as the protrusions, and the protrusions and the materials for connecting the protrusions form an integrated structure; for example, an array of protrusions is arranged on a flexible substrate. The sensing structure 2021 comprises a plurality of protrusions arranged in an array, which are beneficial to the part of the protrusions contacted with the electronic writing pad to rebound after deformation under the action of pressing force, and restore to the shape before no force is applied.

Since there are various shapes of the protrusions in the sensing structure 2021, the embodiments of the present application will be described by taking the following three cases as examples:

in the first case, as shown in fig. 5, fig. 5 is a schematic distribution diagram of a plurality of sensing structures arranged in an array according to an embodiment of the present application. The end surface of each protrusion far from the erasing surface in the sensing structure 2021 is triangular in shape.

In the second case, as shown in fig. 6, fig. 6 is a schematic distribution diagram of a plurality of sensing structures arranged in an array according to another embodiment of the present application. The end surface of each protrusion far from the erasing surface in the sensing structure 2021 is hexagonal.

In a third case, as shown in fig. 7, fig. 7 is a schematic distribution diagram of a plurality of sensing structures arranged in an array according to another embodiment of the present application. The end faces of the sensing structures 2021, where a part of the protrusions are far from the erasing surface, are all octagonal, and the end faces of the other part of the protrusions are far from the erasing surface, are all rectangular.

It should be noted that, in other possible implementations, the end surface of the plurality of protrusions in the sensing structure 2021 away from the erasing surface may have other shapes (for example, a circle shape), and of course, a combination of a plurality of different shapes may be also possible. The embodiments of the present application are not limited in this regard.

It should be further noted that a separation groove 2022 is formed between any two adjacent sensing structures 2021, and the separation groove 2022 and the sensing structures 2021 are also manufactured by an integral molding process.

In this application, each of the protrusions in the sensing structure 2021 is at least partially configured such that the relative position between the protrusions changes upon being subjected to pressure (e.g., each protrusion approaches each other and compresses the space of the separation groove 2022 between each protrusion). In this case, after the portion of the protrusions located in the transition region 202 of the erasing part 200 is in contact with the display surface of the electronic writing board, the user may apply pressure to the erasing tool 000 so that the portion of the protrusions is in a positional relationship with the protrusions arranged around the portion of the protrusions, and thus the protrusions arranged around the portion of the protrusions are also in contact with the electronic writing board under the action of the pressing force. In this way, the user can change the contact area between the portion of the bump in the erasing part 200 located in the transition area 202 and the electronic writing pad by applying different degrees of pressing force to the erasing tool 000, thereby improving the erasing effect of the electronic writing pad on writing. Preferably, when the shape and arrangement of the protrusions are set to the above three conditions, the portion of the erasing portion 200 contacting the electronic writing pad is deformed by the pressing force and then rebounds, and returns to the shape before being stressed.

In another possible scenario, at least a portion of the erase portion 200 (e.g., the portion where the transition region 202 is located) of the erase tool 000 includes a sensing structure 2021. Referring to fig. 8, fig. 8 is a schematic view of a portion of a sensing structure of an erasing portion in a transition region, and a sensing structure 2021 in the transition region 202 may include: the pressed deformation structure 2021a and the conductive layer 2021b located outside the pressed deformation structure 2021a, and the pressed deformation structure 2021a is configured to deform after being pressed. It should be noted that, the conductive layer 2021b is located outside the deformed structure 2021a, which is understood that when the erasing operation is performed, the conductive layer 2021b is closer to the electronic writing pad than the deformed structure 2021 a. Here, the pressed deformation structure 2021a may include: the substrate B1 and the bump B2 located between the substrate B1 and the conductive layer 2021 a. The distribution of the protrusions B2 on the substrate B1 is various, and the following three cases are taken as examples in the embodiment of the present application:

in the first case, as shown in fig. 9, fig. 9 is a schematic diagram illustrating a protrusion distribution of a pressed deformation structure according to another embodiment of the present application. The end surfaces of the protrusions of the pressed deformation structure 2021a, which are away from the erasing surface, are triangular in shape.

In the second case, as shown in fig. 10, fig. 10 is a schematic diagram illustrating the distribution of protrusions of another pressed deformation structure according to another embodiment of the present application. The end surfaces of the protrusions of the pressed deformation structure 2021a away from the erasing surface are all hexagonal in shape.

In the third case, as shown in fig. 11, fig. 11 is a schematic view showing the distribution of protrusions of yet another pressed deformation structure according to another embodiment of the present application. The shape of the end surface of the part of the protrusion away from the erasing surface in the pressed deformation structure 2021a is octagonal, and the shape of the end surface of the other part of the protrusion away from the erasing surface is rectangular.

Preferably, when the shape and arrangement of the protrusions are set as cases 4 to 6, it is particularly advantageous for the portion of the erasing part 200 in contact with the electronic writing pad to rebound after being deformed by the pressing force, and to return to the shape before being unstressed.

By way of example, the base B1 and the protrusion B2 in the pressed deformation structure 2021a may be a unitary structure. For example, the substrate B1 and the protrusion B2 may each be made of an acryl material. For example, after the dividing grooves 2022 are formed by grooving the acrylic substrate B1, a plurality of projections B2 may be formed on the substrate B1. The entire substrate B1 is plate-shaped, and the plate-shaped acrylic plate can be deformed by pressing. Therefore, the substrate B1 in the pressure-receiving deformation structure 2021B can be pressure-deformed. It should be noted that, in other possible implementations, the substrate B1 and the bump B2 in the pressed deformation structure 2021B may be made of other polymers, which is not limited in this embodiment of the present application.

In this application, after the substrate B1 in the pressed deformation structure 2021B is pressed and deformed, the relative positions between the protrusions B2 arranged on the deformed portion of the substrate B1 may change, so that the contact area between the sensing structure 2021 located in the transition region 202 in the erasing portion 200 and the display surface of the electronic writing pad may change. After the pressing force applied to the substrate B1 is released, the protrusion B2 provided on the substrate B1 can contribute to the substrate B1 returning to the undeformed state.

It should be noted that, when the erasing tool 000 is adapted to an electronic writing pad having a touch electrode layer, not only the erasing portion 200 of the erasing tool 000 needs to be conductive, but also at least a portion of the supporting portion 100 of the erasing tool 000 needs to be conductive, and a conductive circuit can be formed between the supporting portion 100 and the erasing portion 200. In this way, when the user holds the supporting portion 100 to make the erasing portion 200 contact with the electronic writing pad, a conductive loop for absorbing the electric charge on the surface of the electronic writing pad can be formed between the erasing portion 200, the supporting portion 100 and the user, so that the touch electrode layer in the electronic writing pad can feel the change of the electric charge, and the area to be erased can be determined.

In a second alternative implementation, the erasure tool 000 may be adapted to an electronic tablet having photosensitive elements, or may be adapted to an electronic tablet made based on the principle of optical erasure. In this case, please refer to fig. 12, fig. 12 is a schematic structural diagram of another erasing tool provided in the embodiment of the present application. The erasing part 200 in the erasing tool 000 includes: the housing 203, and a light source 204 located within the housing, the housing 203 may have an erasing surface. The cover 203 is made of a material having light transmittance and a certain elasticity. Therefore, when the light source 204 in the housing 203 is turned on, the light emitted from the light source 204 in the housing 202 can pass through the housing 203 and exit. It should be noted that the portion of the outer surface of the casing 203 located in the transition region 202 may also be provided with a protrusion in the first alternative implementation described above, so as to facilitate the resilience of the erasing portion 200 after being stressed.

In one case, the erasing portion 200 with the light source 204 may be used in conjunction with a photosensitive element in an electronic writing pad. When the electronic writing board is in the erasing mode, after the erasing part 200 in the erasing tool 000 can be in contact with the display surface of the electronic writing board, the light source 204 in the erasing part 200 can emit light into the area in contact with the display surface of the electronic writing board, so that the electronic writing board can determine the irradiation area of the light source 204 through the photosensitive element. In this way, the electronic tablet can determine the illuminated area of the light source 204 as the area to be erased by the photosensitive component.

In another case, the erasing portion 200 having the light source 204 may be used in combination with an electronic writing pad made based on the principle of optical erasing. When the electronic writing board is in the erasing mode, after the erasing part 200 in the erasing tool 000 can be in contact with the display surface of the electronic writing board, the light source 204 in the erasing part 200 can emit light into the area in contact with the display surface of the electronic writing board, and the electronic writing board can directly erase writing in the irradiation area of the light source 204.

In this application, the light source 204 may include: the erasing part 200 may further include: a controller 204 located within the enclosure 203, the controller 204 being electrically connectable to each of the point light sources. Wherein the controller 205 is configured to: after the erasing surface is contacted with the display surface of the electronic handwriting board, a part of point light sources in the plurality of point light sources are controlled to emit light rays to the contact area of the erasing surface and the display surface of the electronic handwriting board.

By way of example, when the erasing surface in the erasing portion 200 has both the central region 201 and the transition region 202, the plurality of point light sources in the erasing portion 200 may include: the plurality of second point light sources 2041 and the plurality of first point light sources 2042, and the controller 205 in the erasing portion 200 is electrically connected to the second point light sources 2041 and the first point light sources 2042, respectively.

Wherein the controller 205 is configured to: after the central area 201 of the erasing surface contacts with the display surface of the electronic writing board, controlling the plurality of second point light sources 2041 to emit light to the central area 201; after the transition area 202 of the erasing surface contacts the display surface of the electronic writing board, a portion of the first point light sources 2042 of the plurality of first point light sources 2042 is controlled to emit light to the contact area of the transition area 202 and the display surface of the electronic writing board.

In this case, only the portion of the erasing portion 200 contacting the display surface of the electronic writing board can emit light under the control of the controller 205, so that the light source 204 in the erasing portion 200 emits light only to the contact area of the erasing portion 200 and the electronic writing board, and does not emit light to the non-contact area, thereby effectively avoiding the phenomenon that writing in the non-contact area in the electronic writing board is erased by mistake, and further improving the accuracy of erasing writing presented by the electronic writing board.

Optionally, the controller 205 is further configured to: after the central area 201 of the erasing surface is separated from the display surface of the electronic writing board, controlling the plurality of second point light sources 2041 to stop emitting light; after the transition area 202 of the erasing surface is separated from the display surface of the electronic writing board, each first point light source 2042 is controlled to stop emitting light. In this case, the controller 205 in the erasing part 200 can control the light source 204 to stop light emission as long as it determines that the erasing part 200 is separated from the electronic writing board. Thus, the problem that the light source 204 still emits light to the electronic handwriting board under the condition that the erasing part 200 is not contacted with the electronic handwriting board is effectively avoided, and the accuracy of erasing writing displayed on the electronic handwriting board is further improved.

In the present embodiment, the sensing structures 2021 disposed in the transition region 202 of the erasing surface may be generally distributed on the housing 203, that is, the housing 203 may serve as a substrate for supporting the sensing structures 2021. Moreover, the sensing structure provided on the housing 203 may have various implementation manners, and the sensing structure 2021 with different structures may have different working principles. For this reason, the embodiment of the present application will be schematically described by taking the following two cases as examples.

In the first case, please refer to fig. 13, fig. 13 is a cross-sectional view of an erasing portion at a transition area according to an embodiment of the present 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 in the transition region 202 of the housing 203 may refer to fig. 5, fig. 6 and fig. 7, which are not described herein. The plurality of first touch electrodes C1 in the sensing structure 2021 may correspond to the plurality of first point light sources 2042, for example, the plurality of first touch electrodes C1 corresponds to the plurality of first point light sources 2042 one by one; alternatively, each first touch electrode C1 corresponds to at least two first point light sources 2042; or alternatively; each first point light source 2042 corresponds to at least two first touch electrodes C1. The controller 205 may be electrically connected to the respective first touch electrodes C1, and the controller 205 may be configured to: the first point light source 2042 corresponding to the first touch electrode C1, which controls the signal change in the plurality of first touch electrodes C1, emits light.

By way of example, the erasing part 200 in the erasing tool 000 can further include: and a plurality of first touch signal lines C2 electrically connected with the first touch electrodes C1 in a one-to-one correspondence manner. The controller 205 may be electrically connected to the plurality of first touch electrodes C1 through the plurality of first touch signal lines C2.

In this case, after the electronic writing pad contacts the transition area 202 of the erasing part 200 in the erasing tool 000, the electronic writing pad absorbs a portion of the charge, so that the capacitance in the area of the erasing part 200 contacting the electronic writing pad changes, and thus, the signal on the first touch electrode C1 in the area of the erasing part 200 contacting the electronic writing pad changes. The controller 205 may determine the first touch electrode C1 with the changed signal through the plurality of first touch signal lines C2, and then, the controller 205 may control the first point light source 2042 corresponding to the first touch electrode C1 with the changed signal to emit light. Thus, after the transition area of the erasing portion 200 contacts the electronic writing pad, the first point light source 2042 in the erasing portion 200 emits light only to the contact area with the electronic writing pad.

Alternatively, if the controller 205 determines that the signal on the first touch electrode C1 with the signal change is recovered to the corresponding signal when it is not in contact through the plurality of first touch signal lines C2, the controller 205 may determine that the transition area 202 of the erasing portion 200 is separated from the electronic writing board, and the controller 205 may control the first point light source 2042 that is previously turned on to stop emitting light.

In the embodiment of the present application, the first touch electrode C1 and the first touch signal line C2 in the erasing portion 200 are made of a conductive material having light transmittance. For example, the first touch electrode C1 and the first touch signal line C2 are made of Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO) and the like. In this way, it can be ensured that the first point light source 2042 in the erasing portion 200 can normally exit from the transition zone 202.

It should be noted that, fig. 12 is an example in which the plurality of first touch electrodes C1 disposed on the transition area 202 are located on the outer side of the casing 203 (i.e. the side of the casing 203 facing away from the supporting portion 100), and in other possible implementations, the plurality of first touch electrodes C1 may also be located on the inner side of the casing 203 (i.e. the side of the casing 203 facing the hand-held portion 100), which is not limited in this embodiment of the present application.

It should be noted that, when the plurality of first touch electrodes C1 are located outside the casing 203, the protective layer 206 is further disposed on a side of the plurality of first touch electrodes C1 facing away from the casing 203.

In the second case, please refer to fig. 14, fig. 14 is a cross-sectional view of another erasing portion provided in the embodiment of the present application at the transition area. 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 in the transition region 202 of the housing 203 may refer to fig. 5, 6 and 7, which are not described herein. The plurality of first pressure sensors Z1 in the sensing structure 2021 may correspond to the plurality of first point light sources 2042, for example, the plurality of first pressure sensors Z1 corresponds to the plurality of first point light sources 2042 one to one; alternatively, each first pressure sensor Z1 corresponds to at least two first point light sources 2042; or alternatively; each first point light source 2042 corresponds to at least two first pressure sensors Z1. The controller 205 may be electrically connected to each of the first pressure sensors Z1, and the controller 205 may be configured to: the first point light source 2042 corresponding to the first pressure sensor Z1, which detects the pressing force, among the plurality of first pressure sensors Z1 is controlled to emit light.

By way of example, the first pressure sensor Z1 disposed within the transition zone 202 may include: the first electrode Z11, the piezoelectric material layer Z13, and the second electrode Z12 are stacked in 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 may apply a driving signal to the first electrode Z11, and after a certain first pressure sensor Z1 receives a pressing force, the second electrode Z12 in the first pressure sensor Z1 outputs a corresponding voltage signal under the action of the piezoelectric material layer Z13 in the first pressure sensor Z1. The controller 205 can determine the first pressure sensor Z1 subjected to the pressing force by detecting the voltage signal output from each of the second electrodes Z12.

In this case, after the electronic writing board contacts the transition region 202 of the erasing surface in the erasing tool 000, the controller 205 may determine the position of the first pressure sensor Z1 receiving the pressing force through the voltage signal output from the second electrode Z12 in each of the first pressure sensors Z1, and the position of the pressure sensor Z1 is the position of the region in the erasing part 200 contacting the electronic writing board. Thereafter, the controller 205 may control the first point light source 2042 corresponding to the portion of the first pressure sensor Z1 to emit light. Thus, after the transition area of the erasing portion 200 contacts the electronic writing pad, the first point light source 2042 in the erasing portion 200 emits light only to the contact area with the electronic writing pad.

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

In another case, the pressing force detected by the first pressure sensor Z1 needs to be positively correlated with the light intensity of the light emitted by the corresponding first point light source 2042. In this case, after the controller 205 detects the pressing force 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 light intensity according to the correspondence between the pressing force detected by the first pressure sensor Z1 and the light intensity of the light emitted by the corresponding first point light source 2042.

Alternatively, if the controller 205 determines, through the voltage signals output by the second electrodes Z12 in the first pressure sensors Z1, that the first pressure sensor Z1 that has previously received the pressing force is no longer receiving the pressing force, the controller 205 may determine that the transition area 202 of the erasing surface is separated from the electronic writing board, and the controller 205 may control the first point light source 2042 that has been previously lighted to stop lighting.

In the embodiment of the present application, the piezoelectric layer Z13 in the first pressure sensor Z1 may be made of a transparent piezoelectric material such as polyvinylidene fluoride (polyvinylidene difluoride, abbreviated as PVDF or PVF 2) and its copolymer polyvinylidene fluoride-co-trifluoroethylene (english: poly-difluoro-trifluoro ethylene), abbreviated as P (VDF-TrFE). In this way, it can be ensured that the first point light source 2042 in the erasing portion 200 can normally exit from the transition zone 202.

It should be noted that, fig. 14 is an example in which the plurality of first pressure sensors Z1 disposed in the transition area 202 are located outside the housing 203 (i.e., on the side of the housing 203 facing away from the supporting portion 100), and in other possible implementations, the plurality of first pressure sensors Z1 may also be located inside the housing 203 (i.e., on the side of the housing 203 facing the hand-held portion 100), which is not limited in this embodiment of the present application.

It should be noted that, when the plurality of first pressure sensors Z1 are located outside the housing 203, a protective layer 206 is further required to be disposed on a side of the plurality of first pressure sensors Z1 facing away from the housing 203.

In the embodiment of the present application, the controller 205 in the erasing part 200 can control the operation state of the first point light source 2042 by the above two cases. For the control manner of the controller 205 on the operating state of the second point light source 2041, a sensing element may be disposed in the central region 201 of the erasing surface, and the sensing element may be electrically connected to the controller 205. Wherein the controller 205 may determine whether the center region 201 is in contact with the electronic tablet via the sensing element. For example, after the controller 205 determines that the central region 201 of the erasing surface is in contact with the electronic writing pad through the sensing element, the controller 205 may control the second point light source 2041 to emit light; after the controller 205 determines that the center area 201 of the erasing surface is separated from the electronic writing pad by the sensing element, the controller 205 may control the second point light source 2041 to stop emitting light.

Alternatively, the sensing element may include: at least one second touch electrode and/or at least one second pressure sensor. The second touch electrode may be the same as the first touch electrode C1 in the first case, and the second pressure sensor may be opposite to the first pressure sensor Z1 in the second case. For this reason, the operation principle of the second touch electrode and the second pressure sensor will not be described.

In one exemplary implementation, a plurality of point light sources within the enclosure 203 are each attached to an inside of the enclosure 203. For example, the light emitting sides of the first point light sources 2042 of the plurality of point light sources are all directed toward the transition region 202 of the erasing surface, and the light emitting sides of the second point light sources 2041 of the plurality of point light sources are directed toward the central region 201 of the erasing surface.

For example, the first point light source 2042 and the second point light source 2041 may each be located on a flexible circuit board, and the flexible circuit board may be disposed proximate to the inside of the enclosure 203. Thus, 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 shown in fig. 12, it is ensured that the light rays emitted from the plurality of first point light sources 2042 in the housing 203 are emitted only from the transition region 202 of the housing 203, and are not emitted toward the central region 201; and it is ensured that the light emitted from the second point light source 2041 in the housing 203 is emitted only from the central region 201 of the housing 203 and does not exit toward the transition region 201. Thus, the light emitted by the erasing part 200 can be ensured to be emitted to only the erasing area contacted with the electronic handwriting board and not emitted to the non-erasing area of the electronic handwriting board, so that the erasing precision of the electronic handwriting board is ensured to be higher.

It should be noted that, a collimation structure may be set for each point light source to ensure that each point light source can perform vertical light emission through the corresponding collimation structure, so as to further improve the erasing precision of the electronic handwriting board.

In another exemplary implementation, the point light sources within the enclosure 203 include: the light emitting device comprises a light emitting device and a collimation structure positioned on the light emitting side of the light emitting device, wherein the collimation structure is used for adjusting the light emitting angle of the light emitting device so that light rays emitted by the point light source are emitted vertically from the erasing surface. In this case, the point light source in the housing 203 does not need to be attached to the inside of the housing 203.

For example, please refer to fig. 15, fig. 15 is a schematic structural diagram of a first point light source according to an embodiment of the present application. The first light emitting device L1, and a first collimating structure M1 located at the light emitting side of the first light emitting device L1, where the first collimating 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 is emitted vertically from the transition zone 202 of the erasing surface.

For example, to ensure that the light from the erasing tool 000 does not strike the non-contact area, it is desirable to ensure that the light from the point light source 2041 in the erasing tool 000 is perpendicular to the contact surface of the erasing tool 000 with the display surface contact area of the electronic writing pad. However, the light emitted by the first light emitting device L1 is generally divergent, and the light propagates in all directions. For this purpose, the first collimating structure M1 may be used to adjust the divergent light emitted by the first light emitting diode L1, so that the adjusted light can vertically exit from the transition region 202 of the erasing surface. Here, the first alignment structure M1 may be a concave mirror or a light-transmitting group formed by a plurality of lenses, which is not limited in this application.

Referring to fig. 16, fig. 16 is a schematic structural diagram of a plurality of second point light sources according to an embodiment of the present disclosure. The plurality of second point light sources 2041 in the housing 203 includes: the light sources 2041 are arranged in an array, and the light sources L2 are arranged in an array. Note that the plurality of second light emitting devices L2 in the plurality of second point light sources 2041 may emit light simultaneously under the control of the controller 205, and in this case, the plurality of second point light sources 2041 may also be referred to as a surface light source.

By way of example, since the area of the central region 201 of the erasing surface is large, the second point light source 2041 is composed of a plurality of second light emitting devices L2 arranged in an array. Similarly, in order to ensure that the light emitted from the second point light source 2041 is perpendicular to the central region 201, a concave mirror or a light-transmitting group formed by a plurality of lenses may be used as the second collimating structure M2 to adjust the light emitted from the second light emitting device L2. In this application, fig. 16 illustrates an example in which the second collimating structure M2 is a lens.

In the embodiment of the present application, the first light emitting device L1 and the second light emitting device L2 may be organic light emitting diodes (Organic Light Emitting Diode, abbreviated as OLED), quantum dot light emitting diodes (Quantum Dot Light Emitting Diodes, abbreviated as QLED), light emitting diodes (Light Emitting Diode, abbreviated as LED), micro LEDs, or the like. The embodiments of the present application are not limited in this regard.

In other possible implementations, the light source 204 in the erasing portion 200 may be composed of an optical fiber and a light emitting device. Wherein the end of the optical fiber may be directed toward the inside of the housing 203 and the light emitting device may be disposed toward the tail of the optical fiber. Thus, light emitted from the light emitting device can be emitted from the tail portion of the optical fiber toward the end portion of the optical fiber and then emitted through the housing 203.

In a third alternative implementation, the erase portion 200 of the erase tool 000 is both conductive and capable of emitting light. In this case, the erasing means 000 can be adapted to both an electronic writing pad having a touch electrode layer and an electronic writing pad having a photosensitive element, and to an electronic writing pad manufactured based on the principle of optical erasing. The structure of the erasing tool 000 and the principle of adapting to various electronic writing boards are referred to the above two alternative implementations, and are not repeated herein.

The embodiment of the application also provides a handwriting system, please refer to fig. 17, fig. 17 is a schematic structural diagram of the handwriting system provided in the embodiment of the application. The handwriting system may include: an erasure tool 000 and an electronic writing pad. By way of example, the erasure tool 000 may be any of the erasure tools 000 shown in fig. 3, 4 and 12 described above, and the electronic tablet may be an electronic tablet adapted to any of the erasure tools 000 described above. By way of example, the following embodiments are each schematically illustrated using an electronic tablet as the liquid crystal tablet 111.

The liquid crystal handwriting board 111 may include: a first substrate 010 and a second substrate 011 disposed opposite to each other, and a liquid crystal layer 012 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.

In an embodiment of the present application, bistable liquid crystal molecules in a bistable liquid crystal molecule layer are configured to: after the second substrate 011 is subjected to external pressure, the focal conic texture is changed into a planar texture. For example, when the writing tool applies a certain pressure to the second substrate 011 while the liquid crystal writing pad 111 is in the writing mode, a portion of bistable liquid crystal molecules in the liquid crystal layer 012 in the liquid crystal writing pad 111 is changed from focal conic texture to planar texture by an external pressure. In this way, the bistable liquid crystal molecules having the planar texture can reflect light (for example, green light) with a certain wavelength among the ambient light irradiated on the liquid crystal handwriting board 111, so that the liquid crystal handwriting board 111 can display the corresponding writing trace.

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

The first substrate 0101 in the first substrate 010 may be a rigid substrate. In this way, the overall rigidity of the liquid crystal handwriting board 111 can be ensured to be good. For example, the second substrate 201 may be a glass base. The second substrate 0111 in the second substrate 011 may be a flexible substrate, and the material of the second substrate 0111 may include: polyethylene terephthalate (English: polyethylene Terephthalate; abbreviated as PET). In this way, the pressure applied by the outside can be ensured to control the bistable liquid crystal molecules to be converted into a planar texture from a focal conic texture.

The materials of the pixel electrode 0102 in the first substrate 010 and the common electrode 0112 in the second substrate 011 may each include: transparent conductive material such as ITO or IZO. In this way, it is ensured that light can pass through the liquid crystal handwriting board 111.

The liquid crystal handwriting board 111 may be configured to: after the erasing part 200 of the erasing tool 000 is contacted with the second substrate 011, a region where the erasing part 200 is contacted with the second substrate 011 is determined as a region to be erased, and a pixel voltage is applied to the pixel electrode 0102 in the region to be erased, so that a voltage difference is formed between the pixel electrode 0102 and the common electrode 0112 in the region to be erased.

In embodiments of the present application, the bistable liquid crystal molecules are further configured to: after a voltage difference is formed between the pixel electrode 0102 and the common electrode 0112 in the erased pixel region, the planar texture is changed into the focal conic texture. For example, when the liquid crystal handwriting board 111 is in the erasing mode, after the erasing portion 200 of the erasing tool 000 contacts with the area of the writing trace displayed in the liquid crystal handwriting board, the liquid crystal handwriting board can determine the position of the contact area between the erasing portion 200 and the display surface of the liquid crystal handwriting board, 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 handwriting board 111 can make the voltage difference between the pixel electrode 0102 and the common electrode 0112 in the pixel area to be erased by applying the pixel voltage to the pixel electrode 0102 in the pixel area to be erased, so that the liquid crystal molecules in the area to be erased are rearranged under the action of the voltage difference, that is, the liquid crystal molecules can be converted from the planar texture into the focal conic texture. Therefore, the liquid crystal molecules converted into the focal conic texture can transmit the incident ambient light, and further the writing in the area to be erased is erased.

In the embodiment of the present application, the structure of the liquid crystal handwriting board 111 adapted to different types of erasing tools 000 is different. For this reason, the embodiments of the present application will be described below by taking two realizable modes as examples.

In a first implementation manner, when the erasing portion 200 of the erasing tool 000 and the sensing structure 2021 are integrally formed and made of a conductive material, that is, the erasing tool 000 is shown in the first alternative implementation manner in the above embodiment, please refer to fig. 18, and fig. 18 is a schematic diagram of a film structure of a liquid crystal handwriting board provided in the present application. The second substrate 011 in the liquid crystal handwriting board 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, the touch electrode layer 0113 being closer to the second substrate 0111 than the common electrode 0112.

The liquid crystal handwriting board 111 is configured to: after the erasing part 200 contacts with the second substrate 011, the position information of the area to be erased is detected by the touch electrode layer 0113.

In an embodiment of the present application, please refer to fig. 19, fig. 19 is a top view of a liquid crystal handwriting board provided in the embodiment of the present application. The touch electrode layer 0113 in the liquid crystal handwriting pad 111 may include: a plurality of touch electrode blocks 0113a. An overlapping area exists between the front projection of the touch electrode block 0113a in the touch electrode layer 0113 on the second substrate 0111 and the front projection of the at least one pixel electrode 0102 on 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 on the second substrate 0111 is located within the orthographic projection of the corresponding touch electrode block 0113a on the second substrate 0111.

In the embodiment of the present application, as shown in fig. 19, the second substrate 011 in the liquid crystal handwriting board 111 may further include: a plurality of touch signal lines Tx. The plurality of touch signal lines Tx may be electrically connected to the plurality of touch electrode blocks 0113a in a one-to-one correspondence.

For example, the liquid crystal handwriting board 111 may apply touch signals to a plurality of touch signal lines Tx at the same time. After an external object (for example, an erasing tool) contacts with the first substrate 100 in the liquid crystal handwriting board 111, the external object absorbs a part of charges in the liquid crystal handwriting board 111, so that a capacitance value between the touch electrode block 0113a and the common electrode 01112 in a contact area of the external object and the second substrate 011 changes, further, a touch signal loaded on a touch signal line Tx connected with the touch electrode block 0113a in the contact area changes, and the liquid crystal handwriting board 111 can position a contact area of the external object and the second substrate 011 by sensing the touch signal line Tx with the change of the touch signal.

For example, the front projection of the pixel electrode 0102 on the first substrate 0101 is not overlapped with the front projection of the touch signal line Tx on the first substrate 0101, so that the touch signal loaded on the touch signal line Tx is ensured not to interfere with the pixel voltage loaded on the pixel electrode 0102. In the present application, a plurality of pixel electrodes 0102 in the liquid crystal handwriting board 111 may be arranged in an array, and at least one touch signal line Tx may be arranged between two adjacent columns of pixel electrodes 0102.

In the embodiment of the present application, please refer to fig. 19 and fig. 20, fig. 20 is a schematic diagram of a film structure of a second substrate according to the embodiment of the present application. The second substrate 011 in the liquid crystal handwriting board 111 may further include: and a second insulating layer 0115 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 hole V.

Fig. 19 is a schematic illustration taking as an example that each touch signal line Tx in the second substrate 011 is electrically connected to the corresponding touch electrode block 102a through one second via V.

Note that, the materials of the touch electrode layer 0113 and the touch signal line Tx in the liquid crystal handwriting pad 111 may include: transparent conductive material such as ITO or IZO.

In this embodiment, when the liquid crystal handwriting board is in the erasing mode, the erasing portion 200 with the conductive performance may be disposed in the second substrate 011 after the second substrate 011 of the liquid crystal handwriting board 111 contacts, and by disposing the touch electrode layer 0113 in the second substrate 011, the position of the contact area between the erasing portion 200 and the second substrate 011 may be determined, so as to determine the position information of the area to be erased in the liquid crystal handwriting board 111. After that, the liquid crystal handwriting board 111 applies a pixel voltage to the pixel electrode 0102 in the region to be erased, so that a voltage difference is formed between the pixel electrode 0102 and the common electrode 0112 in the region to be erased. The liquid crystal layer molecules in the area to be erased in the liquid crystal handwriting board are rearranged under the action of the voltage difference, namely the liquid crystal molecules can be changed from a planar texture to a focal conic texture. Therefore, the liquid crystal molecules converted into focal conic textures can transmit the incident ambient light, so that the handwriting erasing function of the handwriting system in the local area can be realized.

In a second implementation, when the erasing part 200 of the erasing instrument 000 includes: referring to fig. 21, fig. 21 is a schematic diagram of a film structure of another liquid crystal handwriting board provided in the present application, when the housing 203 and the light source 204 are located in the housing 203, that is, the erasing tool 000 is a structure shown in the second alternative implementation manner in the foregoing embodiment. The liquid crystal handwriting board 111 further includes: photosensitive component 013. The liquid crystal handwriting board 111 is configured to: after the erasing part 200 is in contact with the second substrate 011, and the light source 204 emits light to the contact area of the erasing part 200 and the second substrate 011, positional information of the area to be erased is detected by the photosensitive member 013.

In the embodiment of the present application, the first substrate 010 has a plurality of pixel regions, and each pixel region may have one pixel electrode 0102 arranged therein. The photosensitive element 013 in the liquid crystal handwriting board 111 has a plurality of photosensitive elements 013a, one photosensitive element 013a corresponding to at least one pixel region, and an orthographic projection of the photosensitive element 013a on the first substrate 010 at least partially overlaps the corresponding at least one pixel region. In this application, each photosensitive element 013a in the photosensitive assembly 013 may correspond to at least one pixel region.

For example, when it is necessary to erase writing displayed on the liquid crystal writing pad 111, the writing may be erased using the erasing tool 000 capable of emitting light. After the erasing tool 000 is in contact with the second substrate 011, and the light source 204 emits light to the contact area of the erasing part 200 and the second substrate 011, the light emitted from the erasing tool 000 and transmitted through the liquid crystal writing board 111 can be sensed by the light sensitive element 013a in the light sensitive element 013, and the positional information of the area to be erased can be detected by the light sensitive element 013. The liquid crystal handwriting board 111 causes writing lines in the pixel region to be erased according to the position of the pixel region to be erased.

For example, the liquid crystal handwriting board 111 may determine the position of the pixel region corresponding to a photosensitive element 013 by sensing the light emitted by the erasing tool 000 by a certain photosensitive element 013a in the photosensitive element 013 and the corresponding relationship between the photosensitive element 013a and the pixel region. In this way, the liquid crystal handwriting board 111 can determine the position information of the light irradiated on the liquid crystal handwriting board 111 based on the position of the pixel area corresponding to the photosensitive element, so as to obtain the position information of the pixel area to be erased.

The photosensitive element 013 may be provided separately from the first substrate 010 of the liquid crystal writing board 111, or may be integrated in the first substrate 010. When the photosensitive member 013 is provided separately from the first substrate 010, the photosensitive member 013 may include: the first substrate 010 is located far away from the circuit board of the side of the second substrate 011, and a plurality of photosensitive elements 013a arranged in arrays on the circuit board, wherein the photosensitive elements 013a can be photoresistors, photodiodes or phototriodes. When the photosensitive element 013 is integrated within the first substrate 010, a plurality of photosensitive elements 013a in the photosensitive element 013 are each a photosensitive transistor, and each photosensitive transistor is distributed within one pixel region.

In this embodiment, when the liquid crystal handwriting board is in the erasing mode, after the erasing portion 200 with the light emitting performance contacts the second substrate 011 of the liquid crystal handwriting board 111, by disposing the photosensitive element 013 in the liquid crystal handwriting board 111, the position of the contact area between the erasing portion 200 and the second substrate 011 can be determined, so as to determine the position information of the area to be erased in the liquid crystal handwriting board 111. After that, the liquid crystal handwriting board 111 applies a pixel voltage to the pixel electrode 0102 in the pixel region to be erased, so that a voltage difference is formed between the pixel electrode 0102 and the common electrode 0112 in the pixel region to be erased. The liquid crystal layer molecules in the area to be erased in the liquid crystal handwriting board are rearranged under the action of the voltage difference, namely the liquid crystal molecules can be changed from a planar texture to a focal conic texture. Therefore, the liquid crystal molecules converted into focal conic textures can transmit the incident ambient light, so that the handwriting erasing function of the handwriting system in the local area can be realized.

Alternatively, when the erasing surface of the erasing part 200 is provided with pressure sensors (i.e., a first pressure sensor located in the transition region and a second pressure sensor located in the central region), since the erasing part 200 can detect different pressing forces by the pressure sensors, and the light source can be controlled to emit light rays of different light intensities according to the different pressing forces, for example, the pressing force detected by the pressure sensors can be positively correlated with the light intensity of the light rays emitted by the light source. Therefore, when the liquid crystal handwriting board is in the erasing mode, the user can apply different pressing forces to the erasing part 200 of the erasing tool 000, so that the light source in the erasing part can emit light rays with different light intensities, and further different erasing effects can be realized on the erasing area by the liquid crystal handwriting board 111.

For example, the liquid crystal handwriting board 111 can also detect the light intensity of the light emitted from the erasing part 200 through the photosensitive member 013, and can apply different pixel voltages to the pixel electrode 0102 in the area to be erased according to the light intensity of the light emitted from the erasing part 200. For example, when the light intensity detected by the liquid crystal handwriting board 111 through the photosensitive component 013 is strong, the pixel voltage is applied to the pixel electrode 0102 in the area to be erased by the liquid crystal handwriting board 111, and at this time, the erasing degree of the writing trace in the area to be erased is high; when the light intensity detected by the liquid crystal handwriting board 111 through the photosensitive component 013 is weak, the pixel voltage applied by the liquid crystal handwriting board 111 to the pixel electrode 0102 in the area to be erased is small, and at this time, the erasing degree of the writing trace in the area to be erased is low.

In this way, the user can erase writing on the liquid crystal writing pad 111 to different extents by applying different pressing forces to the erasing tool 000.

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

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

The foregoing description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, since it is intended that all modifications, equivalents, improvements, etc. that fall within the spirit and scope of the invention.

Claims

1. An erasure tool, comprising: a supporting part and an erasing part fixedly connected with the supporting part;

2. The erase tool of claim 1, wherein a portion of the erase portion within the transition region is configured to deform upon being subjected to pressure.

3. The erase tool of claim 1, wherein a portion of the erase surface within the transition region is arcuate convex.

4. The erase tool of claim 3, wherein the erase surface further has a central region, a portion of the erase surface within the central region being planar, the arcuate convex surface being distributed about the planar surface.

5. The erasing tool as recited in any one of claims 1 to 4 wherein at least a portion of the erasing portion is integrally formed with the sensing structure and is made of a material having electrical conductivity;

6. The erase tool of claim 5, wherein the sensing structure includes: a plurality of protrusions arranged in an array, a portion of the plurality of protrusions being configured to change relative positions between different protrusions upon being subjected to a pressure;

7. The erase tool of any one of claims 1 to 4, wherein the erase portion includes: a housing, and a light source within the housing, the housing having the wiping surface.

8. The erasure tool of claim 7 wherein the light source comprises: a plurality of point light sources, the erasing part further includes: a controller located within the housing, the controller being electrically connected to each of the point light sources;

9. The erase tool of claim 8, wherein the sensing structure includes: the first touch electrodes are arranged in an array mode, and the first touch electrodes correspond to the point light sources; the controller is electrically connected with each first touch electrode;

10. The erase tool of claim 8, wherein the sensing structure includes: the first pressure sensors are arranged in an array mode, and the first pressure sensors correspond to the point light sources; the controller is electrically connected with each first pressure sensor;

the controller is configured to: and controlling point light sources corresponding to the first pressure sensors which detect the pressing force in the plurality of first pressure sensors to emit light.

11. The erase tool of any one of claims 8 to 10, wherein the erase surface further has a central region, a sensing element disposed within the central region of the erase surface, 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.

12. The eraser tool according to any one of claims 8 to 10, wherein the light emitting sides of the plurality of point light sources are attached to the inner side of the casing.

13. The erasing tool as recited in any one of claims 8 to 10, wherein the point light source includes: the light source comprises a light emitting device and a collimation structure positioned on the light emitting side of the light emitting device, wherein the collimation structure is used for adjusting the light emitting angle of the light emitting device so that light rays emitted by the point light source are emitted vertically from the erasing surface.

14. A handwriting system, comprising: an electronic writing pad and an erasing instrument according to any one of claims 1 to 13.

15. The handwriting system of claim 14 wherein the electronic handwriting pad comprises: a first substrate and a second substrate disposed opposite to each other, and a bistable liquid crystal molecular layer between the first substrate and the second substrate;

16. The handwriting system according to claim 15, wherein when said erasing portion is of unitary construction with said sensing structure and is made of a material having conductivity, said second substrate further comprises: a touch electrode layer located at one side of the second substrate, and a first insulating layer located between the touch electrode layer and the common electrode, the touch electrode layer being closer to the second substrate than the common electrode;

17. The handwriting system according to claim 15, wherein when said erasing section comprises: the housing, and when being located the light source in the housing, the liquid crystal handwriting board still includes: a photosensitive component;