CN113759585A - Optical erasing piece and optical erasing optical wavelength determining method thereof - Google Patents
Optical erasing piece and optical erasing optical wavelength determining method thereof Download PDFInfo
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- CN113759585A CN113759585A CN202110974486.9A CN202110974486A CN113759585A CN 113759585 A CN113759585 A CN 113759585A CN 202110974486 A CN202110974486 A CN 202110974486A CN 113759585 A CN113759585 A CN 113759585A
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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
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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
-
- 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 erasing, and provides an optical erasing piece and an optical erasing optical wavelength determining method of the optical erasing piece, wherein the optical erasing piece comprises a control unit and a light-emitting assembly, the control unit is communicated with a liquid crystal writing device, the light-emitting assembly 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 wavelengths of the light-emitting elements; the wavelength determination method comprises the following steps: controlling the light emitting components of the optical erasing piece to emit light with different wavelengths with the same intensity; acquiring the sum of induced currents of all TFTs in an illumination area, which are caused by the light emission of the optical erasing part; selecting the wavelength corresponding to the maximum sum of the TFT induced currents as the wavelength of an erasing light source of the optical erasing piece; the invention adaptively adjusts the light-emitting wavelength according to the obtained illumination induced current, and realizes the optimal erasing of each TFT bistable liquid crystal writing device or each batch of TFT bistable liquid crystal writing devices.
Description
Technical Field
The invention belongs to the technical field of liquid crystal writing board erasing, and particularly relates to an optical erasing piece and an optical erasing wavelength determining method of the optical erasing piece.
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 patent number CN112684618B discloses a technical scheme for realizing local erasing of a liquid crystal writing device by illumination, which comprises a conductive layer, a bistable liquid crystal layer and a substrate layer sequentially arranged from top to bottom; a plurality of pixel units are arranged on the basal layer in an array mode, and each pixel unit is internally provided with a pixel electrode and a thin film field effect transistor TFT (TFT for short) connected with the pixel electrode; applying a set control voltage to the gate electrode of the TFT and applying a set input voltage to the source electrode of the TFT so that the TFT is in a critical state; applying a set voltage to the conductive layer; at this time, an erasing device (hereinafter referred to as an optical erasing member) applies light within a set intensity range to an area to be erased, so that the TFT in the area receiving the light is turned on, a set voltage is input to the corresponding pixel electrode, and when the voltage between the pixel electrode and the conductive layer reaches an erasing voltage of the liquid crystal, partial erasing can be performed.
At present, a light erasing piece configured on the TFT bistable liquid crystal writing device can only provide light with one wavelength, the sensitivity of the TFT bistable liquid crystal writing device with different process parameters to light with different wavelengths is different, at present, a proper light erasing piece light-emitting wavelength can only be determined by testing through human experience, however, the optimal light erasing wavelength among the TFT bistable liquid crystal writing devices or among all batches of TFT bistable liquid crystal writing devices is not consistent, when the same light-emitting wavelength is adopted, the optimal erasing of each TFT bistable liquid crystal writing device 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 piece and an optical erasing wavelength determining method of the optical erasing piece, wherein the light emitting wavelength is adjusted in a self-adaptive manner according to the 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 purpose, the 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 an optical 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 can control the switching of the light emitting elements or adjust the wavelength of the light emitting elements.
According to a second aspect of the present invention, there is provided an optical erasing member erasing light wavelength determining method, including:
controlling the optical erasing piece to emit light with the same intensity and different wavelengths;
acquiring the sum of induced currents of all TFTs in an illumination area, which are caused by the light emission of the optical erasing part;
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 erasing member.
According to a third aspect of the present invention, there is provided an optical erasing member erasing optical wavelength determining system comprising:
a light emission control module configured to: controlling the optical erasing piece to emit light with the same intensity and different wavelengths;
a current acquisition module configured to: acquiring the sum of induced currents of all TFTs in an illumination area, which are caused by the light emission of the optical erasing part;
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 erasing member.
According to a fourth aspect of the present invention, there is provided a controller that loads and executes the optical erasing light wavelength determining method described above.
According to a fifth aspect of the present invention, there is provided a liquid crystal writing apparatus comprising the above-described optical erasing member.
According to a sixth aspect of the present invention, there is provided a liquid crystal writing apparatus comprising the above-described controller.
According to a seventh aspect of the present invention, there is provided a liquid crystal writing apparatus comprising the above-described optical erasing member and the above-described controller, the control unit of the optical erasing member being in communication with the controller.
According to an eighth aspect of the present invention, there is provided a liquid crystal writing apparatus using the above-described optical erasing light wavelength determining method to determine an optimum erasing light wavelength of the optical erasing member.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a light emitting component of an optical erasing piece, which comprises: the control unit can control the on-off of the light-emitting elements or adjust the wavelength of the light-emitting elements, and the light-emitting wavelength can be adjusted or the light-emitting elements can be selected in a self-adaptive mode according to the obtained illumination induced current, so that the optimal erasing effect of each TFT bistable liquid crystal writing device is guaranteed, and the user experience is improved.
Advantages of 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 incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a first TFT connection diagram provided in embodiment 1 of the present invention.
Fig. 2 is a second schematic connection diagram of a TFT provided in embodiment 1 of the present invention.
Fig. 3 is a flowchart illustrating a method for determining an optimal erasing light of a liquid crystal writing apparatus according to embodiment 1 of the present invention.
Fig. 4 is a schematic diagram of an illuminated induced current detection circuit provided in embodiment 1 of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. 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 invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1:
embodiment 1 of the present invention provides an optical erasing member comprising a control unit and a light emitting element, wherein the control unit is in communication 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 can control the switching of the light emitting elements or adjust the wavelength of the light emitting elements.
In this embodiment, light emitting elements of 7 colors, which are purple, blue, emerald green, yellow, orange, and red, respectively, are provided on the optical erasing member; the light erasing piece firstly turns on a certain light emitting element, for example, a purple light emitting element is firstly turned on, the purple light emitting element irradiates an erasing area with preset light intensity, and the sum of the sizes of all TFT illumination induced currents in an illumination area caused by the independent light emission of the light erasing piece is detected; turning off the purple light-emitting element, turning on the blue light-emitting element, adding the sum of the illumination induction currents of all the TFTs in the illumination area again, sequentially detecting the illumination induction currents of the light-emitting elements of the rest colors, and taking the light-emitting element corresponding to the sum of the illumination induction currents of all the TFTs in the maximum illumination area as the optimal light-emitting element, wherein the light-emitting wavelength corresponding to the light-emitting element is the optimal wavelength.
Of course, it can be understood that, in some other embodiments, a person skilled in the art may sequentially open and close the light emitting elements of each color in other orders and obtain the corresponding induced currents, as long as the light emitting elements of the color corresponding to the sum of the maximum induced currents can be obtained.
It is understood that in other embodiments, more light emitting elements, such as 8, 9 or more light emitting elements, or other numbers greater than or equal to two light emitting elements, may be disposed on the optical erasing member, and those skilled in the art may select the light emitting elements according to specific conditions, which is not described herein again.
It can be understood that, in some other embodiments, the light erasing member is provided with a light emitting element with adjustable light emitting wavelength, and sequentially performs illumination with different wavelengths or different wavelength ranges under the same light emitting intensity, and detects the sum of the magnitudes of all TFT illumination induced currents in the corresponding illumination area, and the light emitting wavelength of the light erasing member corresponding to the sum of the magnitudes of all TFT illumination induced currents in the maximum illumination area is the optimal light erasing wavelength, so that the best effect is obtained when performing light erasing with this wavelength.
Example 2:
the embodiment 2 of the present disclosure provides a method for determining an erasing light wavelength of an optical erasing member, and a liquid crystal writing device to which the present embodiment is applied includes: the liquid crystal display panel comprises a conducting layer, a bistable liquid crystal layer and a substrate layer which are sequentially arranged from top to bottom, wherein the conducting layer can be not divided, a plurality of pixel units are integrated on the substrate layer, the pixel units are arranged in an array mode, a pixel electrode and a TFT connected with the pixel electrode are arranged in each pixel unit, and the TFT can provide voltage for the pixel electrode connected with the TFT in a conducting mode.
Specifically, as shown in fig. 1 and fig. 2, wiring diagrams of the TFT are respectively given. In fig. 1, the first plate represents a pixel electrode region to which the TFT is connected on the base layer; the second plate represents a conductive layer; the drain electrode of the TFT can be also connected with a storage capacitor, the leading-out electrode wire of each storage capacitor is connected with the leading-out electrode wire of the conducting layer, and the TFT is switched on to charge the storage capacitors.
In fig. 1, the storage capacitor C functions to prevent voltage abrupt change, but it is also possible to realize the function of the storage capacitor C by using a distributed capacitance formed between the conductive layer and the underlying 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(area of light-transmitting opening, channel material and Process, storage capacitor C, intensity of light)
It can be seen that the light induced current of the TFT is determined by the area of the light-transmitting opening, the channel material and process, the storage capacitor C and the light intensity, and 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 optical erasing member described in the embodiment 1 to emit light with different wavelengths with the same intensity;
acquiring the sum of induced currents of all TFTs in an illumination area, which are caused by the light emission of the optical erasing part;
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 erasing member.
Obtaining the photo induced current by first applying a high potential V to the gate G of the TFT as shown in FIG. 4HAnd causes switch S to close, VDC=VCOMThen, the switch S is opened to give the gate G of the TFT a control point Vg，VsGrounding, wherein the TFT is in a critical state, and when the TFT is simultaneously illuminated by the light erasing part and the ambient light, the light induced current of the TFT caused by the light erasing part and the ambient lightI 3 (i.e., the third illumination induced current) is:
when the light of the light erasing part is closed, the change of the intensity of the ambient light can be ignored, and the TFT light induced current caused by the ambient light alone is at the momentI 2 (i.e., the second illumination induced current) is:
the photo induced current of the TFT caused by the light of the photo erasing member aloneI 1 (i.e., the first illumination induced current) is:
in the present embodiment, the first and second electrodes are,
and
are all R1Voltage across, through and R2Series-connected voltage-dividing resistor R3So that R is2And R3In the readable range of the processor by reading R2And R3A voltage in between can be obtained
And
。
induced current according to light irradiation of each TFT in the light irradiation region caused by light irradiation of the light erasing member aloneI 1 SelectingI 1 The wavelength corresponding to the maximum is taken as the wavelength of the erasing light source of the optical erasing piece.
In this embodiment, the critical state specifically includes: 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 conducted; and when not irradiated by the light of the set light intensity, the TFT is in the off state.
It can be understood that the circuit diagram shown in fig. 4 of this embodiment is only a preferred example, and a person skilled in the art may select the circuit diagram according to a specific working condition to calculate the TFT illumination induced current, as long as a corresponding current detection value can be obtained quickly, and a person skilled in the art may select the circuit diagram according to a specific working condition, which is not described herein again.
It is understood that in some other embodiments, the sum of the induced currents caused by the light emitting component emitting light can also be generated directly when the light erasing member emits light to the illumination area when no ambient light is irradiated completely.
Example 3:
embodiment 3 of the present invention provides an optical erasing element erasing optical wavelength determining system, including:
a light emission control module configured to: controlling the optical erasing piece to emit light with the same intensity and different wavelengths;
a current acquisition module configured to: acquiring the sum of induced currents of all TFTs in an illumination area, which are caused by the light emission of the optical erasing part;
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 erasing member.
Example 4:
embodiment 4 of the present invention provides a controller, where the controller loads and executes the optical erasing wavelength determining method of the optical erasing member described in embodiment 2.
Example 5:
embodiment 5 of the present invention provides a liquid crystal writing apparatus including the optical erasing member described in embodiment 1.
Example 6:
embodiment 6 of the present invention provides a liquid crystal writing apparatus including the controller described in embodiment 4.
Example 7:
embodiment 7 of the present invention provides a liquid crystal writing apparatus comprising the optical erasing member described in embodiment 1 and the controller described in embodiment 4, the control unit of the optical erasing member being in communication with the controller.
Example 8:
embodiment 8 of the present invention provides a liquid crystal writing apparatus that determines an optimal erasing light wavelength of an optical erasing member by using the optical erasing member erasing light wavelength determining method described in embodiment 2.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An optical erasing member comprising a control unit and a light emitting assembly, wherein the control unit is in communication 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 can control the switching of the light emitting elements or adjust the wavelength of the light emitting elements.
2. An optical erasing light wavelength determining method of an optical erasing member is characterized by comprising the following steps:
controlling the optical erasing piece to emit light with the same intensity and different wavelengths;
acquiring the sum of induced currents of all TFTs in an illumination area, which are caused by the light emission of the optical erasing part;
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 erasing member.
3. The liquid crystal writing apparatus optimum erasing light determining method of claim 2,
the sum of induced currents caused by the light emitting component emitting light is as follows: the difference value of the sum of all TFT illumination induced currents generated when the light-emitting component emits light and the ambient light simultaneously irradiates the illumination area and the sum of all TFT illumination induced currents generated when the ambient light singly irradiates the illumination area.
4. The liquid crystal writing apparatus optimum erasing light determining method of claim 2,
the sum of induced currents caused by the light emitting component emitting light is as follows: when no ambient light is irradiated, the light emitted by the light erasing part is directly irradiated on the TFT.
5. An optical erase wavelength determination system for an optical erase member, comprising:
a light emission control module configured to: controlling the optical erasing piece to emit light with the same intensity and different wavelengths;
a current acquisition module configured to: acquiring the sum of induced currents of all TFTs in an illumination area, which are caused by the light emission of the optical erasing part;
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 erasing member.
6. A controller, wherein the controller loads and executes the optical erasing light wavelength determining method of any one of claims 2 to 4.
7. A liquid crystal writing instrument comprising the optical erasing member of claim 1.
8. A liquid crystal writing apparatus comprising the controller of claim 6.
9. A liquid crystal writing instrument comprising the optical erasing member of claim 1 and the controller of claim 6, the control unit of the optical erasing member being in communication with the controller.
10. A liquid crystal writing apparatus, characterized in that the optical erasing light wavelength determining method of any one of claims 2 to 4 is used to determine the optimum erasing light wavelength of the optical erasing member.
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2021
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| JPH10161589A (en) * | 1996-11-29 | 1998-06-19 | Sanyo Electric Co Ltd | Driving method of flat display device |
| US20040262612A1 (en) * | 2003-03-26 | 2004-12-30 | Video Display Corporation | Electron-beam-addressed active-matrix spatial light modulator |
| CN1584649A (en) * | 2004-06-03 | 2005-02-23 | 清华大学 | Light label scraping wave filter based on optical fibre environment |
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