CN113759585B - Optical erasing member and optical erasing wavelength determining method thereof - Google Patents

Optical erasing member and optical erasing wavelength determining method thereof Download PDF

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CN113759585B
CN113759585B CN202110974486.9A CN202110974486A CN113759585B CN 113759585 B CN113759585 B CN 113759585B CN 202110974486 A CN202110974486 A CN 202110974486A CN 113759585 B CN113759585 B CN 113759585B
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light
wavelength
optical
erasing
light emitting
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CN113759585A (en
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李清波
杨猛训
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Shandong Lanbeisite Educational Equipment Group
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The invention belongs to the technical field of liquid crystal writing board erasure, and provides an optical erasing member and an optical erasing member erasure wavelength determining method, wherein the optical erasing member comprises a control unit and a light emitting component, the control unit is communicated with a liquid crystal writing device, the light emitting component comprises at least two groups of light emitting elements with different light emitting wavelengths or at least one group of light emitting elements with adjustable light emitting wavelengths, and the control unit can control the on-off of the light emitting elements or adjust the wavelength of the light emitting elements; the wavelength determining method comprises the following steps: controlling the light emitting components of the light erasing member to emit light with the same intensity and different wavelengths; acquiring the sum of induced currents of all TFTs in the illumination area, which are caused by the luminescence of the optical erasing member; selecting the wavelength corresponding to the maximum sum of the TFT induced currents as the wavelength of the erasing light source of the optical erasing member; according to the invention, the luminous wavelength is adjusted in a self-adaptive manner according to the acquired illumination induction current, so that the optimal erasure of each TFT bistable liquid crystal writing device or each batch of TFT bistable liquid crystal writing devices is realized.

Description

Optical erasing member and optical erasing wavelength determining method thereof
Technical Field
The invention belongs to the technical field of liquid crystal writing board erasing, and particularly relates to an optical erasing member and an optical wavelength determining method for erasing the optical erasing member.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The invention patent of the patent number CN112684618B discloses a technical scheme for realizing local erasure of a liquid crystal writing device by utilizing illumination, wherein the scheme comprises a conductive layer, a bistable liquid crystal layer and a basal layer which are sequentially arranged from top to bottom; a plurality of pixel units are arranged on the basal layer in an array manner, and each pixel unit is internally provided with a pixel electrode and a thin film field effect transistor (TFT) connected with the pixel electrode; applying a set control voltage to the gate of the TFT and a set input voltage to the source of the TFT, so that the TFT is in a critical state; applying a set voltage to the conductive layer; at this time, the erasing device (hereinafter referred to as an optical erasing member) applies illumination within a set intensity range to the region to be erased, so that the TFT in the region receiving the illumination is turned on, thereby inputting a set voltage to the corresponding pixel electrode, and when the voltage between the pixel electrode and the conductive layer is charged until reaching the erasing voltage of the liquid crystal, the local erasing can be realized.
The existing optical erasing member configured by the TFT bistable liquid crystal writing device can only provide light with one wavelength, the sensitivity of the TFT bistable liquid crystal writing devices with different process parameters to the light with different wavelengths is different, the existing optical erasing member can only rely on human experience to carry out experiments to determine the appropriate light emitting wavelength of the optical erasing member, however, the optimal light erasing wavelength among all TFT bistable liquid crystal writing devices or among all batches of TFT bistable liquid crystal writing devices is inconsistent, when the same light emitting wavelength is adopted, the optimal erasing of all TFT bistable liquid crystal writing devices cannot be realized, and the user experience is reduced.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides an optical erasing member and an optical erasing member erasing light wavelength determining method, which are used for adaptively adjusting the light emitting wavelength according to the magnitude of an illumination induction current value, so that the optimal erasing effect of each TFT bistable liquid crystal writing device is ensured.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in order to achieve the above object, according to a first aspect of the present invention, there is provided a light-erasing member comprising a control unit and a light-emitting assembly, wherein the control unit communicates with a liquid crystal writing device,
the light emitting assembly includes: at least two groups of light-emitting elements with different light-emitting wavelengths or at least one group of light-emitting elements with adjustable light-emitting wavelengths;
the control unit is capable of controlling the switching of the light emitting element or adjusting the wavelength of the light emitting element.
According to a second aspect of the present invention, there is provided a method for determining a wavelength of light erased by an optical eraser, comprising:
controlling the light erasing member to emit light with different wavelengths and the same intensity;
acquiring the sum of induced currents of all TFTs in the illumination area, which are caused by the luminescence of the optical erasing member;
the wavelength corresponding to the maximum sum of the TFT induced currents is selected as the wavelength of the erasing light source of the optical erase member.
According to a third aspect of the present invention, there is provided an optical eraser erasing optical wavelength determining system comprising:
a light emission control module configured to: controlling the light erasing member to emit light with different wavelengths and the same intensity;
a current acquisition module configured to: acquiring the sum of induced currents of all TFTs in the illumination area, which are caused by the luminescence of the optical erasing member;
a wavelength determination module configured to: the wavelength corresponding to the maximum sum of the TFT induced currents is selected as the wavelength of the erasing light source of the optical erase member.
According to a fourth aspect of the present invention, there is provided a controller that loads and executes the above-described optical eraser erasure wavelength determining method.
According to a fifth aspect of the present invention, there is provided a liquid crystal writing apparatus comprising the above optical eraser.
According to a sixth aspect of the present invention, there is provided a liquid crystal writing apparatus comprising the controller described above.
According to a seventh aspect of the present invention, there is provided a liquid crystal writing apparatus comprising the above optical eraser and the above controller, the control unit of the optical eraser being in communication with the controller.
According to an eighth aspect of the present invention, there is provided a liquid crystal writing apparatus, which uses the above-described optical eraser erasing light wavelength determining method to determine an optimal erasing light wavelength of an optical eraser.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a light-emitting component of a light erasing member, comprising: the control unit can control the on-off of the light-emitting elements or adjust the wavelength of the light-emitting elements, and adaptively adjust the light-emitting wavelength or select the light-emitting elements according to the obtained illumination induction current, so that the optimal erasing effect of each TFT bistable liquid crystal writing device is ensured, and the user experience is improved.
Additional aspects of the invention 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 invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a schematic diagram of TFT connection provided in embodiment 1 of the present invention.
Fig. 2 is a second schematic TFT connection diagram according to embodiment 1 of the present invention.
Fig. 3 is a flow chart of a method for determining optimal erasing light of a liquid crystal writing device according to embodiment 1 of the present invention.
Fig. 4 is a schematic diagram of a light-induced current detection circuit according to embodiment 1 of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Example 1:
embodiment 1 of the present invention provides an optical eraser, comprising a control unit and a light emitting assembly, wherein the control unit communicates with a liquid crystal writing device,
the light emitting assembly includes: at least two groups of light-emitting elements with different light-emitting wavelengths or at least one group of light-emitting elements with adjustable light-emitting wavelengths;
the control unit is capable of controlling the switching of the light emitting element or adjusting the wavelength of the light emitting element.
In this embodiment, the light-emitting elements of 7 colors, respectively, are set on the light-erasing member, and are respectively purple, blue, emerald, yellow-green, yellow, orange and red; firstly, a certain light-emitting element is turned on by the light erasing member, for example, a purple light-emitting element is turned on firstly, the erasing area is irradiated with preset light intensity, and the sum of all TFT illumination induction currents in the illumination area caused by the independent light emission of the light erasing member is detected; and turning off the purple light-emitting element, turning on the blue light-emitting element, carrying out the sum of all the TFT illumination induced currents in the illumination area again, sequentially detecting the illumination induced currents of the light-emitting elements with the rest colors, and taking the light-emitting element corresponding to the sum of all the TFT illumination induced currents in the maximum illumination area as an optimal light-emitting element, wherein the light-emitting wavelength corresponding to the light-emitting element is an optimal wavelength.
Of course, it is understood that, in other embodiments, a person skilled in the art may sequentially perform the switching of the light emitting elements of the respective colors in other orders and obtain the corresponding induced currents, so long as the sum of the maximum induced currents can be obtained for the light emitting elements of the respective colors.
It will be appreciated that in other embodiments, more light emitting elements of colors, such as 8, 9 or more, or more than two may be provided on the light erasing member, and those skilled in the art may select the light erasing member according to specific working conditions, which will not be described herein.
It can be understood that in other embodiments, the light erasing member is provided with a light emitting element with an adjustable light emitting wavelength, and under the same light emitting intensity, light with different wavelengths or different wavelength ranges is sequentially performed, and the sum of the magnitudes of all TFT light induced currents in the corresponding light area is detected, and the light erasing member light emitting wavelength corresponding to the sum of the magnitudes of all TFT light induced currents in the maximum light area is the optimal erasing light wavelength, so that the light erasing effect is best.
Example 2:
embodiment 2 of the present disclosure provides a method for determining an erasing wavelength of an optical erasing member, where the liquid crystal writing device includes: the conducting layer, the bistable liquid crystal layer and the basal layer are sequentially arranged from top to bottom, wherein the conducting layer can be not divided, a plurality of pixel units are integrated on the basal layer, the pixel units are arranged in an array mode, a pixel electrode and a TFT (thin film transistor) connected with the pixel electrode are arranged in each pixel unit, and the TFT can be conducted to provide voltage for the pixel electrode connected with the pixel electrode.
Specifically, as shown in fig. 1 and 2, wiring schematic diagrams of TFTs are respectively given. In fig. 1, the first plate represents a pixel electrode region to which TFTs on the base layer are connected; the second plate represents a conductive layer; the drain electrode of the TFT can be connected with the storage capacitors, the lead-out electrode wire of each storage capacitor is connected with the lead-out electrode wire of the conducting layer, and the TFT is turned on to charge the storage capacitors.
In fig. 1, the storage capacitor C is used to prevent voltage abrupt change, and it is of course possible to implement the function of the storage capacitor C by using a distributed capacitance formed between the conductive layer and the base layer, and in this case, the storage capacitor C may be omitted, as shown in fig. 2.
Light induced current of the thin film field effect transistor TFT:
I=f(light-transmitting area of light-transmitting opening, channel material and process, storage capacitor C, light-receiving intensity)
It can be seen that the light-induced current of the TFT is determined by the light-transmitting area of the light-transmitting opening, the channel material and process, the storage capacitor C and the intensity of the received light, and the different channel materials and processes correspond to different sensitive wavelengths.
The determining method, as shown in fig. 3, includes:
controlling the light emitting components of the light erase tool of example 1 to emit light of different wavelengths having the same intensity;
acquiring the sum of induced currents of all TFTs in the illumination area, which are caused by the luminescence of the optical erasing member;
the wavelength corresponding to the maximum sum of the TFT induced currents is selected as the wavelength of the erasing light source of the optical erase member.
The photo-induced current is obtained by first applying a high potential V to the gate G of the TFT as shown in FIG. 4 H And causes the switch S to close, V DC =V COM Then, the switch S is turned on to give the gate G of the TFT a control point V g ，V s When the TFT is simultaneously subjected to light erase member illumination and environment illumination, illumination induced current of the TFT is caused by the light erase member illumination and the environment illuminationI 3 (i.e., the third illumination induced current) is:
Figure 165304DEST_PATH_IMAGE001
when the illumination of the light erasing member is turned off, the change of the ambient illumination intensity is negligible, and the TFT illumination induced current caused by the ambient light aloneI 2 (i.e., the second illumination induced current) is:
Figure 635600DEST_PATH_IMAGE002
the light induced current of the TFT caused by the light of the light erase member aloneI 1 (i.e., the first light induced current) is:
Figure 100079DEST_PATH_IMAGE003
in the present embodiment of the present invention,
Figure 706641DEST_PATH_IMAGE004
and->
Figure 903267DEST_PATH_IMAGE005
All are R 1 The voltage across it is equal to R 2 Series voltage dividing resistor R 3 So that R is 2 And R is R 3 The voltage between the two is within the readable range of the processor by reading R 2 And R is R 3 The voltage between them can be obtained->
Figure 64121DEST_PATH_IMAGE004
And->
Figure 66712DEST_PATH_IMAGE005
。
Dependent on the light-induced current of the individual TFTs in the illuminated area caused by the light of the light-erasing member aloneI 1 SelectingI 1 The wavelength corresponding to the maximum is used as the wavelength of the erasing light source of the optical erasing member.
In this embodiment, the critical state is specifically: applying a set voltage to the conductive layer, and applying a set control voltage and an input voltage to the TFT electrode respectively; when receiving illumination with set illumination intensity, the TFT is turned on; and when the TFT is not irradiated by the illumination with the set illumination intensity, the TFT is in an off state.
It can be understood that the circuit diagram shown in fig. 4 of the present embodiment is only a preferred example, and a person skilled in the art may select the circuit diagram according to specific working conditions to implement calculation of the TFT light sensing current, so long as the person skilled in the art can quickly obtain a corresponding current detection value, and select the circuit diagram according to specific working conditions, which is not described herein again.
It will be appreciated that in other embodiments, the sum of the induced currents caused by the illumination of the light emitting assembly may also be generated directly when the light eraser emits light to the illuminated area when no ambient light is completely illuminated.
Example 3:
embodiment 3 of the present invention provides an optical wavelength determining system for erasing an optical erasing member, including:
a light emission control module configured to: controlling the light erasing member to emit light with different wavelengths and the same intensity;
a current acquisition module configured to: acquiring the sum of induced currents of all TFTs in the illumination area, which are caused by the luminescence of the optical erasing member;
a wavelength determination module configured to: the wavelength corresponding to the maximum sum of the TFT induced currents is selected as the wavelength of the erasing light source of the optical erase member.
Example 4:
embodiment 4 of the present invention provides a controller that loads and executes the optical wavelength determination method for optical eraser described in embodiment 2.
Example 5:
embodiment 5 of the present invention provides a liquid crystal writing apparatus comprising the optical eraser of embodiment 1.
Example 6:
embodiment 6 of the present invention provides a liquid crystal writing apparatus comprising the controller of embodiment 4.
Example 7:
embodiment 7 of the present invention provides a liquid crystal writing apparatus, comprising the optical erase tool of embodiment 1 and the controller of embodiment 4, wherein the control unit of the optical erase tool is in communication with the controller.
Example 8:
embodiment 8 of the present invention provides a liquid crystal writing apparatus, which uses the method for determining the erasing light wavelength of the optical erasing member described in embodiment 2 to determine the optimal erasing light wavelength of the optical erasing member.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A light erasing member comprising a control unit and a light emitting assembly, wherein the control unit is in communication with a liquid crystal writing device, characterized in that,
the light emitting assembly includes: at least two groups of light-emitting elements with different light-emitting wavelengths or at least one group of light-emitting elements with adjustable light-emitting wavelengths;
the control unit can control the switch of the light emitting element or adjust the wavelength of the light emitting element, obtain the sum of induced currents of all TFTs in the illumination area under different light emitting wavelengths, which are caused by the light emission of the light erasing member, and select the wavelength corresponding to the maximum sum of the induced currents of the TFTs as the wavelength of the erasing light source of the light erasing member.
2. A method for determining the wavelength of an erasing light of an optical erasing member, comprising:
controlling the light erasing member to emit light with different wavelengths and the same intensity;
acquiring the sum of induced currents of all TFTs in the illumination area under different light-emitting wavelengths, wherein the induced currents are caused by the light emission of the light erasing member;
the wavelength corresponding to the maximum sum of the TFT induced currents is selected as the wavelength of the erasing light source of the optical erase member.
3. The method for determining the wavelength of light erased by an optical eraser according to claim 2,
the sum of the induced currents caused by the luminescence of the luminescence component is as follows: the difference between the sum of all TFT light-induced currents generated when the light emitting component emits light and ambient light is simultaneously irradiated to the illumination area and the sum of all TFT light-induced currents generated when the ambient light is solely irradiated to the illumination area.
4. The method for determining the wavelength of light erased by an optical eraser according to claim 2,
the sum of the induced currents caused by the luminescence of the luminescence component is as follows: when no ambient light is irradiated, the light is emitted by the light erasing member and directly irradiated onto the TFT.
5. An optical eraser erasure wavelength determining system, comprising:
a light emission control module configured to: controlling the light erasing member to emit light with different wavelengths and the same intensity;
a current acquisition module configured to: acquiring the sum of induced currents of all TFTs in the illumination area under different light-emitting wavelengths, wherein the induced currents are caused by the light emission of the light erasing member;
a wavelength determination module configured to: the wavelength corresponding to the maximum sum of the TFT induced currents is selected as the wavelength of the erasing light source of the optical erase member.
6. A controller that loads and performs the optical eraser erasure wavelength determining method according to any of claims 2 to 4.
7. A liquid crystal writing apparatus comprising the optical eraser of claim 1.
8. A liquid crystal writing apparatus comprising the controller of claim 6.
9. A liquid crystal writing apparatus comprising the optical erase element of claim 1 in communication with the controller of claim 6, the control unit of the optical erase element in communication with the controller.
10. A liquid crystal writing apparatus characterized by using the optical eraser erasure wavelength determining method according to any one of claims 2 to 4 to determine an optimal erasure wavelength of an optical eraser.
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CN109782505A (en) * 2017-11-14 2019-05-21 北京大学 A kind of reflective film and preparation method thereof with light erasing function
CN113284471A (en) * 2021-06-28 2021-08-20 山东蓝贝思特教装集团股份有限公司 Local erasing control method and system for liquid crystal writing device based on illumination erasing

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Publication number Priority date Publication date Assignee Title
JPH10161589A (en) * 1996-11-29 1998-06-19 Sanyo Electric Co Ltd Driving method of flat display device
CN1584649A (en) * 2004-06-03 2005-02-23 清华大学 Light label scraping wave filter based on optical fibre environment
WO2009018399A2 (en) * 2007-07-31 2009-02-05 Kent Displays Incorporated Selectively erasable electronic writing tablet
CN109782505A (en) * 2017-11-14 2019-05-21 北京大学 A kind of reflective film and preparation method thereof with light erasing function
CN208538095U (en) * 2018-05-08 2019-02-22 深圳市德安里科技有限公司 A kind of erasing apparatus and display system
CN113284471A (en) * 2021-06-28 2021-08-20 山东蓝贝思特教装集团股份有限公司 Local erasing control method and system for liquid crystal writing device based on illumination erasing

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