CN113848659A

CN113848659A - Optical erasing assembly, writing system and control method thereof

Info

Publication number: CN113848659A
Application number: CN202111129864.XA
Authority: CN
Inventors: 薛静; 王智勇; 宋勇; 于洪俊
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: 2021-09-26
Filing date: 2021-09-26
Publication date: 2021-12-28
Anticipated expiration: 2041-09-26
Also published as: CN113848659B

Abstract

The embodiment of the application provides an optical erasing component, a writing system and a control method thereof. In the optical erasing component provided by the embodiment of the application, after the first light beam generated by the first light beam generating unit irradiates an area to be erased of the liquid crystal writing board, the first light beam can irradiate the thin film transistor positioned in the area to be erased, the thin film transistor is excited to generate the driving current, and the driving current drives the liquid crystal positioned in the area to be erased to change from the second state to the first state, so that the erasing of the writing track information displayed in the area to be erased is realized, and the erasing of the local writing track information in the liquid crystal writing board can be realized. The light emitting area and/or the light emitting intensity of the first light beam can be adjusted by arranging the light emitting adjusting unit, so that the precision of the first light beam in erasing writing track information can be improved, the erasing precision of the optical erasing assembly can be improved, and the application scene of the optical erasing assembly can be expanded.

Description

Optical erasing assembly, writing system and control method thereof

Technical Field

The application relates to the technical field of electronic writing, in particular to an optical erasing component, a writing system and a control method thereof.

Background

With the development of display technology, more and more display products, in particular electronic writing display products such as electronic writing pads, appear on the market, and users are favored because users can press and move on the screen to display handwriting matched with the pressing movement track.

However, in the electronic writing display products on the market at present, if a user needs to correct after pressing and writing, the handwriting displayed on the screen needs to be completely erased, and the use experience of the user is greatly reduced because the handwriting cannot be partially erased.

Disclosure of Invention

The application provides an optical erasing component, a writing system and a control method thereof aiming at the defects of the existing mode, and is used for solving the technical problem that handwriting cannot be erased locally in an electronic writing display product in the prior art.

In a first aspect, an embodiment of the present application provides an optical erasing assembly, including:

the first light beam generating unit is used for generating a first light beam, the first light beam is used for irradiating the area to be erased of the liquid crystal writing board, and liquid crystal in the area to be erased is changed from a second state to a first state so as to erase writing track information displayed in the area to be erased;

and the light emitting adjusting unit is used for adjusting the light emitting area and/or the light emitting intensity of the first light beam.

In a second aspect, embodiments of the present application provide a writing system, including: liquid crystal writing board the liquid crystal writing board and the optical erasing component provided in the first aspect described above;

the liquid crystal writing board comprises a first substrate and an array substrate which are oppositely arranged, and a liquid crystal layer arranged between the first substrate and the array substrate, wherein a thin film transistor and a first electrode are arranged between the array substrate and the liquid crystal layer, the thin film transistor is electrically connected with the first electrode, and a second electrode is arranged between the first substrate and the liquid crystal layer.

In a third aspect, an embodiment of the present application provides a method for controlling a writing system provided in the second aspect, including:

determining an area to be erased of the liquid crystal writing board;

the first light beam generating unit of the optical erasing component is controlled to generate a first light beam, the light emitting area and/or the light emitting intensity of the first light beam are/is adjusted through the light emitting adjusting unit, the adjusted first light beam irradiates the area to be erased, the thin film transistor located in the area to be erased generates driving current, and the driving current drives the liquid crystal located in the area to be erased to change from the second state to the first state so as to erase writing track information displayed in the area to be erased.

The beneficial technical effects brought by the technical scheme provided by the embodiment of the application comprise:

in the optical erasing assembly provided by the embodiment of the application, after the first light beam generated by the first light beam generating unit irradiates an area to be erased of the liquid crystal writing board, the first light beam can irradiate the thin film transistor positioned in the area to be erased, so that the thin film transistor is excited to generate the driving current, the driving current drives the liquid crystal positioned in the area to be erased to change from the second state to the first state, and therefore the erasing of the writing track information displayed in the area to be erased is realized, and the writing track information of other areas of the liquid crystal writing board which is not irradiated by the first light beam cannot be erased, so that the erasing of the local writing track information in the liquid crystal writing board can be realized.

Moreover, in the optical erasing component provided by the embodiment of the application, the light emitting area and/or the light emitting intensity of the first light beam can be adjusted by arranging the light emitting adjusting unit, so that the precision of the first light beam in erasing the writing track information can be improved, the erasing precision of the optical erasing component can be improved, and the application scene of the optical erasing component can be expanded.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of a first optical erasing assembly according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a frame structure of the optical erasing device shown in FIG. 1 according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a second optical erasing device according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a third optical erasing assembly according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a fourth optical erasing assembly according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of a liquid crystal writing board in a writing system according to an embodiment of the present disclosure;

fig. 7 is a flowchart illustrating a writing system control method according to an embodiment of the present application.

Description of reference numerals:

10-a first beam generating unit; 11-a first light emergent portion; 12-a second light emergent portion;

20-a luminescence adjustment unit; 21-a first light through hole; 22-control button; 221-a first sub-control button; 222-a second sub-control button; 223-third sub-control button; 224-a fourth sub-control button; 225-fifth sub-control button; 226-sixth sub-control button; 231-aperture structure;

30-a second beam generating unit; 31-a second light pass;

40-a housing;

601-a first substrate; 602-an array substrate; 603-liquid crystal layer 604-thin film transistor; 605-a first electrode; 606-second electrode.

Detailed Description

Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

The inventor of the present application has conducted research and found that most of electronic writing display products on the market at present are cholesteric liquid crystal writing boards, the cholesteric liquid crystal is a bistable liquid crystal, the cholesteric liquid crystal includes two stable states, namely Planar Texture (P state for short) and Focal cosmetic Texture (FC state for short), and both the P state and the FC state can be stable without voltage.

At present, the working principle of the cholesterol liquid crystal writing board is that when the liquid crystal writing board is in an initial state, the cholesterol liquid crystal in the liquid crystal writing board is in an FC state, and at the moment, the writing area of the liquid crystal writing board displays the color of a substrate, which is usually black; when a user presses a writing area of the liquid crystal writing board, the pressed cholesteric liquid crystal is rotated from an FC state to a P state, the cholesteric liquid crystal in the P state reflects external ambient light, so that the writing area displays the ambient light reflected by the cholesteric liquid crystal in the P state, the cholesteric liquid crystal in the P state selectively reflects green light in the ambient light, writing track information is displayed in green, and accordingly, the liquid crystal writing board can display corresponding writing track information on a screen.

However, in the current cholesteric liquid crystal writing board, if a user needs to correct after pressing and writing, an electric field needs to be applied to all cholesteric liquid crystals to restore the P-state cholesteric liquid crystals to the FC-state, that is, handwriting displayed on a screen needs to be erased completely, and cannot be erased locally, which greatly reduces the user experience.

Moreover, in current cholesterol liquid crystal clipboard, it usually sets up the frame at the liquid crystal clipboard to erase the instruction key, when needs erase, need the user to start manually and erase the instruction key, in carrying out the speech, in application scenes such as show, the size of liquid crystal clipboard is often great, in order to avoid influencing spectator's the content that shows in watching the liquid crystal clipboard, the user often needs certain distance apart from the liquid crystal clipboard, lead to erasing also having certain distance between instruction key often and the user, if need frequently erase, the user need frequently be close to the liquid crystal clipboard, this greatly reduced user's use experience.

The application provides an optical erasing component, a writing system and a control method thereof, which aim to solve the technical problems in the prior art.

The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments.

An embodiment of the present application provides an optical erasing device, a schematic structural diagram of the optical erasing device is shown in fig. 1, and the optical erasing device includes: a first light beam generation unit 10 and a light emission adjustment unit 20.

The first light beam generating unit 10 is used for generating a first light beam, the first light beam is used for irradiating the area to be erased of the liquid crystal writing board, and liquid crystal in the area to be erased is changed from a second state to a first state so as to erase writing track information displayed in the area to be erased; and a light emission adjusting unit 20 for adjusting the light emission area and/or the light emission intensity of the first light beam.

In the optical erasing assembly provided by the embodiment of the application, after the first light beam generated by the first light beam generating unit 10 irradiates the to-be-erased area of the liquid crystal writing board, the first light beam can irradiate the thin film transistor located in the to-be-erased area, so that the thin film transistor is excited to generate the driving current, the driving current drives the liquid crystal located in the to-be-erased area to change from the second state to the first state, and therefore erasing of writing track information displayed in the to-be-erased area is achieved, writing track information of other areas of the liquid crystal writing board which is not irradiated by the first light beam cannot be erased, and erasing of local writing track information in the liquid crystal writing board can be achieved.

Moreover, in the optical erasing component provided in the embodiment of the present application, the light emitting area and/or the light emitting intensity of the first light beam can be adjusted by setting the light emitting adjusting unit 20, so that the precision of the first light beam in erasing the writing track information can be improved, the erasing precision of the optical erasing component can be improved, and the application scene of the optical erasing component can be expanded.

In the embodiment of the application, the first light beam generated by the first light beam generating unit 10 can excite the thin film transistor of the irradiated liquid crystal writing board to generate a driving current, and the driving current drives the liquid crystal corresponding to the thin film transistor to change from the second state to the first state, so that the writing track information displayed in the area to be erased in the liquid crystal writing board is excited to be erased. The liquid crystal in the second state in the region of the liquid crystal writing board not incident by the first light beam is maintained in the second state, and therefore, the writing trace information is still displayed in the region, thereby enabling the erasure of the partial writing trace information in the liquid crystal writing board.

In the embodiment of the application, the light emitting area and/or the light emitting intensity of the first light beam are adjusted by the light emitting adjusting unit 20, for example, the diameter, the optical power and the like of the first light beam are adjusted by the light emitting adjusting unit 20, and the optical power of the first light beam is adjusted to enable the thin film transistor to generate a driving current meeting requirements by adjusting the diameter of the first light beam to be matched with the size of the writing track information to be erased, so that the accuracy and the speed of erasing the writing track information by the first light beam can be improved, the erasing accuracy and the speed of the optical erasing component can be further improved, and the application scene of the optical erasing component can be expanded.

Moreover, in the optical erasing component provided in the embodiment of the present application, since the erasing of the writing track information displayed in the region to be erased is realized through the first light beam generated by the first light beam generating unit 10, a user can keep a certain distance from the liquid crystal writing board, and the writing track is not required to be erased by directly contacting the liquid crystal writing board, so that the application scenario of the optical erasing component is expanded, and the use experience of the user can be ensured.

It should be noted that in the embodiments of the present application, the liquid crystal writing board is a cholesteric liquid crystal writing board, that is, the liquid crystal writing board already has cholesteric liquid crystal therein, and accordingly, in the embodiments of the present application, the first state of the liquid crystal is FC state, and the second state of the liquid crystal is P state. Alternatively, in the embodiment of the present application, the liquid crystal in the liquid crystal writing board may also be other types of bistable liquid crystal.

In the embodiment of the present application, as shown in fig. 1, the first light beam generating unit 10 is indicated by a dashed line in fig. 1 due to the shielding of the housing 40. It is understood by those skilled in the art that the light-emitting adjusting unit 20 may be an aperture structure with adjustable diameter and a light-emitting structure with adjustable light-transmitting area, and the detailed description of the specific structure and operation principle of the light-emitting adjusting unit 20 will be described later, and will not be repeated herein.

In the embodiment of the present application, the light emitting area and the light emitting intensity of the first light beam may be adjusted simultaneously by the light emitting adjusting unit 20, or the light emitting area or the light emitting intensity of the first light beam may be adjusted separately by the light emitting adjusting unit 20, so as to adjust the precision of the first light beam for erasing the writing track information.

Optionally, the light emitting intensity of the first light beam is adjusted by the light emitting adjusting unit 20, and with the increase of the light emitting intensity of the first light beam, the drive current generated by the irradiated thin film transistor is also increased, so that the erasing speed of the writing track information can be increased; along with the reduction of the light intensity of the first light beam, the drive current generated by the irradiated thin film transistor is reduced, so that the erasing speed of the writing track information can be reduced, the control of the erasing speed of the writing track information is realized, different erasing effects of the writing track information are realized, and the application scene of the optical erasing component can be expanded.

It should be noted that, as the light intensity of the first light beam decreases, the driving current generated by the irradiated thin film transistor also decreases, and by controlling the moving speed of the first light beam in the region to be erased, a part of the writing track information can be erased, and another part of the writing track information is not erased, so that the display color of the whole writing track information is reduced, and different erasing effects of the writing track information are achieved.

It is understood by those skilled in the art that when the intensity of the first light beam is reduced to a certain value, the driving current generated by the irradiated tft is not enough to drive the liquid crystal to change from the second state to the first state, and the intensity of the light beam is the threshold value at which the first light beam can generate the writing track information erasing effect.

In one embodiment of the present application, the optical erasing assembly further comprises: and a second light beam generating unit 30 for generating a second light beam, which is a collimated light beam.

In the embodiment of the present application, the second light beam generating unit 30 is configured to generate a second light beam, and the second light beam irradiates the liquid crystal writing board and is reflected or scattered by the incident area to form an indication light spot, so as to remind a viewer of paying attention to writing track information displayed at the indication light spot. Optionally, in this embodiment of the application, the second light beam is a collimated light beam, so that the divergence degree of the second light beam can be reduced, and the indication precision of the indication light spot formed by the second light beam is guaranteed.

In the embodiment of the present application, as shown in fig. 1, due to the shielding of the housing 40, the second light beam generating unit 30 is indicated by a dashed line in fig. 1.

In an embodiment of the application, the wavelength range of the first light beam does not overlap with the wavelength range of the second light beam. By the design, the second light beam can be used for indicating without causing error erasure.

In one embodiment of the present application, the wavelength of the first beam is between 485 and 550 nanometers; the wavelength of the second light beam is beyond 485-550 nanometers, so that the second light beam irradiates the liquid crystal writing board to form an indication light spot without causing the change of the liquid crystal state in the liquid crystal writing board.

For example, the wavelength of the first optical beam may include 485 nanometers and/or 550 nanometers; the first optical power range is 2500-. In the embodiment of the application, the purpose of adjusting the light emitting intensity of the first light beam can be achieved by adjusting the light power of the first light beam. Alternatively, the first light beam may include only a single wavelength of light wave, or may include multiple wavelength values of light waves at the same time. Optionally, in this embodiment of the present application, the wavelength of the first light beam is 500 nm, and the optical power of the first light beam is 3000 microwatts.

Optionally, after an irradiation test of the light waves with the same optical power and the wavelengths of 373 nm, 395 nm, 430 nm, 485 nm, 500 nm, 532 nm, 550 nm, 560 nm, 625 nm, 740 nm, 780 nm and 930 nm on the thin film transistor in the liquid crystal writing board, it is found that the light waves with the wavelengths of 485 nm, 500 nm, 532 nm and 550 nm can enable the thin film transistor to generate a driving current meeting the requirement, and therefore, in the embodiment of the present application, the wavelength range of the first light beam is determined to be 485 and 550 nm.

It should be noted that the first light beam generating unit 10 may include a light source for generating white light, and a filter is disposed to select light waves meeting the wavelength range requirement.

In the embodiment of the present application, the wavelength of the second light beam is outside the first wavelength range, thereby preventing the second light beam for indication from causing a change in the state of the liquid crystal in the liquid crystal writing board. Optionally, in this embodiment of the application, the second light beam is laser light, and the wavelength of the second light beam is between 740 and 780 nanometers, for example, the wavelength of the second light beam may include 740 nanometers and/or 780 nanometers; alternatively, the second light beam may include only a single wavelength of light wave, or may include multiple wavelength values of light waves at the same time.

Alternatively, after the irradiation test of the light waves with the wavelengths of 373 nm, 395 nm, 430 nm, 485 nm, 500 nm, 532 nm, 550 nm, 560 nm, 625 nm, 740 nm and 780 nm on the thin film transistor in the liquid crystal writing board, it is found that the light waves with the wavelengths of 740 nm and 780 nm have the smallest influence on the thin film transistor, and the light waves with the wavelengths of 740 nm and 780 nm in each light wave still have the smallest influence on the thin film transistor with the increase of the optical power, so in the embodiment of the present application, the wavelength range of the second light beam is determined to be 740-.

In the embodiment of the present application, the optical power range of the second light beam includes 900-. The second light beam does not cause the change of the liquid crystal state in the liquid crystal writing board, so that the brightness of the indicating light spot formed on the liquid crystal writing board by the second light beam can be changed by changing the optical power of the second light beam, and different use requirements are met. Meanwhile, the transmission distance of the second light beam can be increased by increasing the light power of the second light beam, namely, the distance between the optical erasing component and the liquid crystal writing board can be prolonged, so that the optical erasing component is further convenient for a user to use.

In one embodiment of the present application, the light emission adjusting unit 20 includes a first light passing hole 21 and a light blocking unit (not shown in fig. 1) cooperating with the first light passing hole 21, and the light blocking unit is used for adjusting a light emitting area of the first light beam passing through the first light passing hole 21.

In the embodiment of the present application, the light shielding unit can be a light shielding plate, and the first light passing hole 21 is shielded by the light shielding plate, so as to adjust the light emitting area of the first light beam passing through the first light passing hole 21. Alternatively, a light shielding plate is disposed between the first light passing hole 21 and the first light beam generating unit 10.

In the embodiment of the present application, as shown in fig. 1, the optical erasing assembly includes a housing 40, the housing 40 is cylindrical, the first light beam generating unit 10 and the second light beam generating unit 30 are both disposed in the housing 40, the light emitting adjusting unit 20 is disposed at one end of the cylindrical housing 40, and the light emitting adjusting unit 20 is provided with a first light passing hole 21, so that the first light beam generated by the first light beam generating unit 10 exits through the first light passing hole 21, and the light emitting area of the first light beam is adjusted by the light shielding unit. As will be appreciated by those skilled in the art, as the light-exiting area of the first light beam changes, the light-exiting intensity of the first light beam also changes.

Optionally, in the embodiment of the present application, the second light beam generated by the second light beam generating unit 30 also exits through the first light passing hole 21, and the light exiting area of the second light beam is adjusted by the light shielding unit. As will be appreciated by those skilled in the art, as the light-exiting area of the second light beam changes, the light-exiting intensity of the second light beam also changes.

In one embodiment of the present application, the light emission adjusting unit 20 is electrically connected to the first light beam generating unit 10, and is used for controlling the on and off of the first light beam generating unit 10 and/or controlling the brightness of the first light beam generated by the first light beam generating unit 10. In one particular embodiment, the lighting adjustment unit 20 may include at least one control knob 22; the control button 22 is electrically connected to the first light beam generating unit 10.

In the embodiment of the present application, as shown in fig. 2, the control knob of the light emission adjusting unit 20 is electrically connected to both the first light beam generating unit 10 and the second light beam generating unit 30. The light emission adjusting unit 20 may control the second light beam generating unit 30 to be turned on and off. In one embodiment, the illumination adjustment unit 20 includes at least one control knob 22, and the control knob 22 is electrically connected to the first light beam generation unit 10.

In the embodiment of the present application, the control button 22 may include a first sub-control button 221, and the first sub-control button 221 is electrically connected to both the first light beam generating unit 10 and the second light beam generating unit 30, and is used for controlling the on/off of the first light beam generating unit and the second light beam generating unit. Alternatively, as shown in fig. 1, the first sub-control button 221 is a solid button, one end of the first sub-control button 221 is electrically connected to both the first light beam generating device 10 and the second light beam generating device 30, and the other end protrudes from the housing 40, so that the user can trigger the first sub-control button 221.

It is understood by those skilled in the art that the first sub-control button 221 can be a push switch, a knob switch, a push-pull switch, a touch switch, a virtual key disposed on a touch screen, and the like. Alternatively, the first sub control button 221 is a knob type switch, and not only the on and off of the first light beam generation unit 10 and the second light beam generation unit 30 can be controlled by rotating the first sub control button 221, but also the brightness of the first light beam generated by the first light beam generation unit 10 and the brightness of the second light beam generated by the second light beam generation unit 30 can be controlled.

Optionally, in this embodiment of the application, in an initial state of the optical erasing device, the first switch unit 221 is triggered once, the first light beam generation unit 10 is turned on, after the first switch unit 221 is triggered once again, the first light beam generation unit 10 is turned off, and the second light beam generation unit 30 is turned on, and then after the first switch unit 221 is triggered once, the second light beam generation unit 30 is turned off.

Optionally, in an initial state of the optical erasing device, the first switch unit 221 is triggered once, the first light beam generation unit 10 is turned on, and after the first switch unit 221 is triggered once again, the first light beam generation unit 10 is turned off; in the initial state of the optical erasing device, the first switch unit 221 is triggered twice continuously, the second light beam generating unit 30 is turned on, and after the first switch unit 221 is triggered once again, the second light beam generating unit 30 is turned off.

Those skilled in the art understand that, in the embodiment of the present application, the manner of controlling the first light beam generation unit 10 and the second light beam generation unit 30 through the first switch unit 221 is not limited to the above two manners, and those skilled in the art may set different control manners according to actual requirements, and only need to ensure that the first light beam generation unit 10 and the second light beam generation unit 30 can be controlled through the first switch unit 221.

Alternatively, in the embodiment of the present application, the first switch unit 221 may have a microprocessor so as to control the first light beam generation unit 10 and the second light beam generation unit 30 according to a preset program.

In one embodiment of the present application, the light shielding unit includes an aperture structure 231, and the aperture structure 231 is used to adjust the diameter of the first light beam passing through the first light passing hole 21.

In the embodiment of the present application, as shown in fig. 3, the housing 40 is cylindrical, the first light beam generating unit 10 is disposed in the housing 50, the aperture structure 231 and the first light passing hole 21 are both disposed at the same end of the cylindrical housing 40, the first light beam exits through the first light passing hole 21 and the aperture structure 231, and the diameter of the exiting first light beam can be adjusted by adjusting the aperture structure 22.

It is understood by those skilled in the art that the specific configuration of the aperture structure 231 can be referred to as an aperture of an existing image pickup apparatus, and will not be described herein.

In one embodiment of the present application, the control button 22 includes a second sub-control button 222, a third sub-control button 223 and a fourth sub-control button 224, the second sub-control button 222 is electrically connected to the first light beam generating unit 10 for controlling the on and off of the first light beam generating unit 10 and/or controlling the brightness of the first light beam generated by the first light beam generating unit 10; the third sub-control button 223 is electrically connected to the second light beam generating unit 30, and is used for controlling the on and off of the second light beam generating unit 30 and/or controlling the brightness of the first light beam generated by the second light beam generating unit 30; the fourth sub-control button 224 is electrically connected to the aperture structure 231 for controlling the light transmission diameter of the aperture structure 231, so as to adjust the diameter of the first light beam emitted through the aperture structure 231.

Optionally, as shown in fig. 3, one end of the second sub-control button 222 is electrically connected to the first light beam generating unit 10, and the other end protrudes out of the housing 40, so that a user can trigger the second sub-control button 222 to control the first light beam generating unit 10. One end of the third sub-control button 223 is electrically connected to the aperture structure 231, and the other end protrudes out of the housing 40, so that the user can trigger the third sub-control button 223 to control the light transmission diameter of the aperture structure 231.

It is understood by those skilled in the art that the second sub control button 222 and the third sub control button 223 can be a push switch, a knob switch, a push-pull switch, a touch switch, and the like. Optionally, in this embodiment of the application, the second sub-control button 222 is a knob switch, and not only the turning on and off of the first light beam generating unit 10 can be realized by rotating the second sub-control button 222, but also the controlling of the increase or decrease of the optical power of the first light beam generated by the first light beam generating unit 10 can be realized, that is, the increase or decrease of the brightness of the first light beam generated by the first light beam generating unit 10 can be controlled.

In the embodiment of the present application, the second light beam generating unit 30 is also disposed in the housing 40, one end of the fourth sub-control button 224 is electrically connected to the second light beam generating unit 30, and the other end protrudes out of the housing 40, so that a user can trigger the fourth sub-control button 224 to control the second light beam generating unit 30. Alternatively, the second light beam generated by the second light beam generating unit 30 may exit through the first light passing hole 21 and the aperture structure 231, so that the diameter of the exiting second light beam can be adjusted by adjusting the aperture structure 231.

In one embodiment of the present application, the housing 40 is further provided with a second light passing hole 31, and the second light beam generated by the second light beam generating unit 20 exits through the second light passing hole 31. Optionally, the second light passing hole 31 is located at an end close to the first light passing hole 21 or far from the first light passing hole 21; when the second light passing hole 31 is located at an end close to the first light passing hole, the first light beam may have the same light emitting direction as the second light beam; when the second light passing hole 31 is located at an end far away from the first light passing hole, the light emitting directions of the first light beam and the second light beam may be opposite.

In the embodiment of the present application, the housing 40 is cylindrical, and as shown in fig. 3, the second light passing hole 31 is located at one end of the housing 40 close to the first light passing hole 21, that is, the second light passing hole 31 and the first light passing hole 21 are located at the same end of the housing 40.

Alternatively, as shown in fig. 4, the second light passing hole 31 is located at one end of the housing 40 away from the first light passing hole 21, i.e., the second light passing hole 31 and the first light passing hole 21 are disposed at opposite ends of the housing 40.

In one embodiment of the present application, the first light beam generating unit 10 includes a first light emergent portion 11 and a second light emergent portion 12, the first light beam is emitted from the first light emergent portion 11 and/or the second light emergent portion 12, and an area of the first light emergent portion 11 is larger than an area of the second light emergent portion 12.

In one embodiment, as shown in fig. 5, the optical erasing component may have a rectangular parallelepiped shape, the first light beam generating unit 10 includes a first light emergent portion 11 and a second light emergent portion 12, and the area of the first light emergent portion 11 is larger than that of the second light emergent portion 12. When the writing track information with a larger area needs to be erased, the first light beam is controlled to be emitted from the first light emitting part 11, so that the first light beam with a larger projection area is obtained; when the writing track information with a small area needs to be erased, the first light beam is controlled to be emitted from the second light emitting part 12, so that the first light beam with a small projection area is obtained. The light emitting control method of the first light emitting portion 14 and the second light emitting portion 15 will be described in detail later, and will not be described herein again.

Alternatively, the first light beam generating unit 10 may be disposed within the housing 40. Optionally, the first light emitting portion 11 and the second light emitting portion 12 are both provided with a plurality of light passing holes, and the light passing holes can limit light to exit at a preset angle, so that influence of large-angle light on accurate erasing is prevented. Preferably, the inner wall of the light through hole comprises a light reflecting material, and light is effectively utilized.

Alternatively, as shown in fig. 5, the first light beam generating unit 10 and the second light beam generating unit 30 may be located on two adjacent sides of the rectangular optical erasing element, so that the user can conveniently hold and control the second light beam to perform the pointing operation.

In an embodiment of the present application, as shown in fig. 5, a combined shape of a contour of the light emitting surface of the first light emitting portion 11 and a contour of the light emitting surface of the second light emitting portion 12 is a rectangle, and a contour of the second light emitting portion 12 includes one vertex of the rectangle, that is, a contour of the light emitting surface of the first light emitting portion 11 is a right-angled trapezoid, and a contour of the second light emitting portion 12 is a right-angled triangle.

Optionally, the housing 40 in the optical erasing assembly has a length of 120 mm and a width of 50 mm. Optionally, the housing 40 in the optical erasing assembly has a length of 135 mm and a width of 55 mm.

Optionally, the optical erasing assembly further includes a second light beam generating unit 30 disposed in the housing 40 and a second light passing hole 31 disposed in the housing 40, and the second light beam generated by the second light beam generating unit 30 exits through the second light passing hole 31. In the embodiment of the present application, as shown in fig. 5, one end of the housing 40 is provided with a second light passing hole 31, so that the second light beam exits through.

In one embodiment of the present application, the first light beam generating unit 10 includes light emitting subunits arranged in an array, and the control button 22 is electrically connected to the light emitting subunits for controlling the number of on and off of the light emitting subunits in the first light beam generating unit 10 and/or for controlling the light emitting brightness of the light emitting subunits.

For example, when fine erasing is required, the number of on-state light emitting sub-units in the first light beam generating unit 10 can be reduced as long as the local light emitting sub-units are on; for example, when the area to be erased is large, the number of the light-emitting sub-units in the first light beam generating unit 10 can be increased, for example, all the light-emitting sub-units can be turned on.

For another example, when the user wants to clear the content of the target position immediately, the light-emitting subunit can be controlled to emit light with higher brightness; for example, when the user wishes to fade the content of the target position, the light-emitting subunit may be controlled to emit light with a lower brightness, but the light-emitting intensity is not lower than the threshold value at which the first light beam can produce the writing track information erasing effect.

Optionally, the light emitting sub-unit is disposed within the light passing hole. Specifically, at least 2 luminous subunits are located in different light through holes, and the light through holes can enable light to be limited to exit at a preset angle, so that influence on accurate erasing by the light with a large angle is prevented. Preferably, the inner wall of the light through hole comprises a light reflecting material, and light is effectively utilized.

In one embodiment of the present application, the control button 22 comprises a first sub-control button 221, a fifth sub-control button 225 and a sixth sub-control button 226, the first sub-control button 221 is electrically connected to the first light beam generating unit 10 and the second light beam generating unit 30, and is used for controlling the on and off of the first light beam generating unit and the second light beam generating unit, and controlling the optical power of the first light beam and/or the second light beam; the fifth sub-control button 225 is electrically connected to the light emitting sub-unit corresponding to the first light emitting part 11, and controls the light emitting sub-unit to be turned on and off; the sixth sub control button 226 is electrically connected to the light emitting sub unit corresponding to the second light emitting part 12, and controls the light emitting sub unit to be turned on and off.

Alternatively, the fifth sub-control button 225 is electrically connected to the light-emitting sub-unit corresponding to the first light-emitting portion 11 to control the light-emitting sub-unit to be turned on or off, so that the light-emitting of the first light-emitting portion 11 and the light-emitting intensity of the first light beam can be controlled. The sixth sub-control button 226 is electrically connected to the light emitting sub-unit corresponding to the second light emitting portion 12 to control the light emitting sub-unit to be turned on or off, so that the light emitting of the second light emitting portion 12 and the light emitting intensity of the first light beam can be controlled.

In the embodiment of the present application, as shown in fig. 5, the first sub control knob 221, the fifth sub control knob 225, and the sixth sub control knob 226 are disposed at the other end of the housing 40. One end of the first sub-control button 221 is electrically connected to both the first light beam generating unit 10 and the second light beam generating unit 30, and the other end protrudes from the housing 40, so that the user can trigger the first control button 41.

Alternatively, the fifth sub-control button 225 may be further connected to a first light shielding plate (not shown in the figure) of the first light emergent portion 11, for driving the first light shielding plate to shield the light through hole of the first light emergent portion 11 or to release the shielding of the light through hole of the first light emergent portion 11.

The fifth sub control button 225 is mechanically connected to the first light shielding plate of the first light emitting portion 11, and the first light shielding plate can shield the light passing hole of the first light emitting portion 11 or release the shielding of the light passing hole of the first light emitting portion 11 by driving the fifth sub control button 225. In the embodiment of the present application, the fifth sub-control button 225 can be a push-type structure, a knob-type structure, a push-pull type structure, and the like.

Alternatively, the sixth sub-control button 226 may also be connected to a second light shielding plate of the second light emergent portion 12, for driving the second light shielding plate to shield the light through hole of the second light emergent portion 12 or to release the shielding of the light through hole of the second light emergent portion 12.

It is understood by those skilled in the art that the fifth sub-control button 225 may also be an electric control switch, the fifth sub-control button 225 is electrically connected to the first light shielding plate, and the electric mechanism is controlled by triggering the fifth sub-control button 225 to drive the first light shielding plate to shield the light through hole of the first light emitting portion 11 or to release the shielding of the light through hole of the first light emitting portion 11.

The sixth sub control button 226 is mechanically connected to the second light shielding plate of the second light emitting portion 12, and the second light shielding plate can shield the light passing hole of the second light emitting portion 12 or release the shielding of the light passing hole of the second light emitting portion 12 by driving the sixth sub control button 226. In the embodiment of the present application, the sixth sub-control button 226 can be a push-type structure, a knob-type structure, a push-pull type structure, and the like.

It is understood by those skilled in the art that the sixth sub-control button 226 may also be an electric control switch, the sixth sub-control button 226 is electrically connected to the first light shielding plate, and the electric mechanism is controlled to drive the second light shielding plate to shield the light through hole of the second light emitting portion 12 or to release the shielding of the light through hole of the second light emitting portion 12 by triggering the sixth sub-control button 226.

Based on the same inventive concept, the embodiment of the present application provides a writing system, which includes: an optical erasing assembly provided by the liquid crystal writing board and any of the above embodiments.

In the embodiment of the present application, as shown in fig. 6, the liquid crystal writing board includes a first substrate 601 and an array substrate 602 that are oppositely disposed, and a liquid crystal layer 603 disposed between the first substrate 601 and the array substrate 602, a thin film transistor 604 and a first electrode 605 are disposed between the array substrate 602 and the liquid crystal layer 603, the thin film transistor 604 is electrically connected to the first electrode 605, and a second electrode 606 is disposed between the first substrate 601 and the liquid crystal layer 603.

In the present embodiment, the liquid crystal layer 603 includes bistable liquid crystals, and as shown in FIG. 6, the elliptical pattern in the liquid crystal layer 603 represents bistable liquid crystals. Optionally, the bistable liquid crystal comprises a cholesteric liquid crystal.

Optionally, the liquid crystal writing board includes a first substrate 601 and an array substrate 602 which are oppositely disposed, a cholesteric liquid crystal is disposed between the first substrate 601 and the array substrate 602, a thin film transistor 604 is configured to generate a driving current under irradiation of a first light beam to drive the cholesteric liquid crystal to deflect, the thin film transistor 604 includes a gate layer, a gate insulating layer, an active layer, a source-drain structure, and a passivation layer, when the thin film transistor 604 generates the driving current under irradiation of the first light beam, an electric field is formed between a first electrode 605 and a second electrode 606 to drive the cholesteric liquid crystal between the first electrode 605 and the second electrode 606 to deflect, so that the cholesteric liquid crystal is changed from a second state to a first state, thereby erasing writing track information.

Based on the same inventive concept, the embodiment of the present application provides a control method of a writing system, a flowchart of the method is shown in fig. 7, and the method includes the following steps S701-S702:

s701, determining an area to be erased of the liquid crystal writing board.

S702, controlling a first light beam generating unit of the optical erasing component to generate a first light beam, and adjusting the light emitting area and/or the light emitting intensity of the first light beam through a light emitting adjusting unit, so that the adjusted first light beam irradiates the area to be erased, a thin film transistor located in the area to be erased generates a driving current, and the driving current drives liquid crystal located in the area to be erased to change from a second state to a first state so as to erase writing track information displayed in the area to be erased.

Optionally, the light emitting area and/or the light emitting intensity of the first light beam generated by the first light beam generating unit 10 are adjusted by the light emitting adjusting unit 20, so that the adjusted first light beam is incident to the area to be erased, and the adjusted first light beam drives the liquid crystal located in the area to be erased to change from the second state to the first state, thereby implementing the erasure of the writing track information displayed in the area to be erased.

In an embodiment of the application, the step S602 of controlling the first light beam generating unit of the optical erasing assembly to generate the first light beam, and adjusting the light emitting area and/or the light emitting intensity of the first light beam by the light emitting adjusting unit, so that the adjusted first light beam irradiates the area to be erased, the thin film transistor in the area to be erased generates the driving current, and the driving current drives the liquid crystal in the area to be erased to change from the second state to the first state, so as to erase the writing trace information displayed in the area to be erased, includes:

controlling the first light beam to be emitted from the first light emitting part 11 and the second light emitting part 12 of the light emitting adjusting unit 20 to obtain the adjusted first light beam with the first light emitting area;

or, the first light beam is controlled to be emitted from the first light emitting part 11, so as to obtain the adjusted first light beam with the second light emitting area;

or, the first light beam is controlled to be emitted from the second light emitting part 12, so as to obtain the adjusted first light beam with the third light emitting area; the second light emitting area and the third light emitting area are both smaller than the first light emitting area, and the second light emitting area is larger than the third light emitting area.

In the embodiment of the present application, for the optical erasing component shown in fig. 5, when the area to be erased is large and the writing track information is more, the first light beam is controlled to exit from the first light emitting portion 11 and the second light emitting portion 12 of the light emitting adjusting unit 20, so as to obtain the adjusted first light beam with the first light emitting area, that is, the first light emitting area is equal to the sum of the area of the first light emitting portion 11 and the area of the second light emitting portion 12, so that the first light beam of the optical erasing component has the largest light emitting area, thereby implementing the large-scale erasing of the writing track information, and improving the erasing speed of the writing track information.

Alternatively, for the optical erasing assembly shown in fig. 5, the first light beam may be further controlled from the first light emitting portion 11 to obtain the adjusted first light beam with the second light emitting area, that is, the second light emitting area is equal to the area of the first light emitting portion 11, so that the light emitting area of the first light beam is equivalent to the size of the writing track information, for example, a thick track exists in the writing track information, so that the first light beam with the second light emitting area is matched with the writing track information, the erasing precision of the writing track information can be improved while the erasing speed of the writing track information is improved, and the erroneous erasing of other writing track information can be avoided.

Optionally, for the optical erasing component shown in fig. 5, the first light beam may be further controlled to exit from the second light emitting portion 12, so as to obtain the adjusted first light beam with a third light emitting area, that is, the third light emitting area is equal to the area of the second light emitting portion 12, so that the light emitting area of the first light beam is equivalent to the size of the writing track information, for example, there is a thin track in the writing track information, so that the first light beam with the third light emitting area is matched with the writing track information, the erasing precision of the writing track information can be further improved, the erroneous erasing of other writing track information can be further avoided, and the fine erasing of the writing track information can be realized.

In one embodiment of the present application, a control method of a writing system further includes:

and determining the area to be indicated of the liquid crystal writing board.

The second light beam generating unit 30 of the optical erasing device is controlled to generate a second light beam, so that the second light beam irradiates the area to be indicated, and the second light beam is reflected or scattered by the area to be indicated to form an indication light spot.

By applying the embodiment of the application, at least the following beneficial effects can be realized:

In the optical erasing component provided in the embodiment of the application, the light emitting area and/or the light emitting intensity of the first light beam can be adjusted by arranging the light emitting adjusting unit 20, so that the precision of the first light beam in erasing the writing track information can be improved, the erasing precision of the optical erasing component can be improved, and the application scene of the optical erasing component can be expanded.

In the optical erasing component provided by the embodiment of the application, due to the fact that the first light beam generated by the first light beam generating unit 10 is used for erasing the writing track information displayed in the area to be erased, a user can keep a certain distance from the liquid crystal writing board, and the writing track is not required to be erased by directly contacting the liquid crystal writing board, so that the application scene of the optical erasing component is expanded, and the use experience of the user can be guaranteed.

Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.

Claims

1. An optical erasing assembly, comprising:

the first light beam generating unit is used for generating a first light beam, the first light beam is used for irradiating an area to be erased of the liquid crystal writing board, and liquid crystal in the area to be erased is changed from a second state to a first state so as to erase writing track information displayed in the area to be erased;

2. An optical erasing assembly as claimed in claim 1, further comprising: and the second light beam generating unit is used for generating a second light beam which is a collimated light beam.

3. The optical erasing assembly of claim 2, wherein the wavelength of the first light beam is between 485 and 550 nanometers, and the wavelength of the second light beam is outside of 485 and 550 nanometers, so that the second light beam forms an indication light spot after being irradiated on the liquid crystal writing board.

4. An optical erasing assembly as claimed in claim 2, characterized in that the second light beam is a laser.

5. An optical erasing assembly as claimed in claim 1, wherein the light-emitting adjusting unit includes a first light-passing hole and a light-shielding unit cooperating with the first light-passing hole, the light-shielding unit being configured to adjust a light-emitting area of the first light beam passing through the first light-passing hole.

6. An optical erasing assembly as claimed in claim 5, wherein the shutter unit comprises an aperture structure for adjusting the diameter of the first light beam passing through the first light passing hole.

7. The optical erasing assembly of claim 1, wherein the first light beam generating unit includes a first light emitting portion and a second light emitting portion, the first light beam is emitted from the first light emitting portion and/or the second light emitting portion, and an area of the first light emitting portion is larger than an area of the second light emitting portion.

8. An optical erasing assembly as claimed in claim 7, wherein the combined shape of the contour of the light emitting surface of the first light emitting portion and the contour of the light emitting surface of the second light emitting portion is a rectangle, and the contour of the second light emitting portion includes an apex of the rectangle.

9. An optical erasing assembly as claimed in claim 1, characterized in that the lighting adjustment unit comprises at least one control knob;

the control button is electrically connected with the first light beam generating unit and is used for controlling the opening and closing of the first light beam generating unit,

and/or controlling the brightness of the first light beam generated by the first light beam generating unit.

10. An optical erasing assembly as claimed in claim 9, wherein the first light beam generating unit includes light emitting sub-units arranged in an array, and the control button is electrically connected to the light emitting sub-units for controlling the number of on and off of the light emitting sub-units in the first light beam generating unit, and/or,

for controlling the light emitting brightness of the light emitting sub-unit.

11. An optical erasing assembly as claimed in claim 2, further comprising a housing and a second light passing hole provided in the housing, through which the second light beam generated by the second light beam generating means exits.

12. A writing system, comprising: a liquid crystal writing board and the optical erasing assembly of any one of claims 1 to 11;

the liquid crystal writing board comprises a first substrate and an array substrate which are arranged oppositely, and a liquid crystal layer between the first substrate and the array substrate, the array substrate and a thin film transistor and a first electrode are arranged between the liquid crystal layer, the thin film transistor and the first electrode are electrically connected, and a second electrode is arranged between the first substrate and the liquid crystal layer.

13. The writing system of claim 12, wherein the liquid crystal layer comprises a bistable liquid crystal.

14. A method of controlling a writing system according to claim 12 or 13, comprising:

determining an area to be erased of the liquid crystal writing board;

the method comprises the steps of controlling a first light beam generating unit of an optical erasing assembly to generate a first light beam, adjusting the light emitting area and/or the light emitting intensity of the first light beam through a light emitting adjusting unit, enabling the adjusted first light beam to irradiate the area to be erased, enabling a thin film transistor located in the area to be erased to generate driving current, and enabling the driving current to drive liquid crystals located in the area to be erased to change from a second state to a first state so as to erase writing track information displayed in the area to be erased.

15. The method as claimed in claim 14, wherein the controlling the optical erasing assembly includes generating a first light beam by a first light beam generating unit, and adjusting light emitting area and/or light emitting intensity of the first light beam by a light emitting adjusting unit, so that the adjusted first light beam irradiates the area to be erased, and a thin film transistor in the area to be erased generates a driving current, and the driving current drives liquid crystal in the area to be erased to change from a second state to a first state, so as to erase the writing trace information displayed in the area to be erased, including:

controlling the first light beam to be emitted from a first light emitting part and a second light emitting part of the light emitting adjusting unit to obtain the adjusted first light beam with a first light emitting area;

or, controlling the first light beam to be emitted from the first light emitting part to obtain the adjusted first light beam with a second light emitting area;

or, the first light beam is controlled to be emitted from the second light-emitting part, and the adjusted first light beam with a third light-emitting area is obtained; the second light emitting area and the third light emitting area are both smaller than the first light emitting area, and the second light emitting area is larger than the third light emitting area.

16. The control method of a writing system according to claim 14, further comprising:

determining a region to be indicated of the liquid crystal writing board;

and controlling a second light beam generating unit of the optical erasing assembly to generate a second light beam, so that the second light beam irradiates the area to be indicated, and the second light beam is reflected or scattered by the area to be indicated to form an indication light spot.