CN112596319B - Light-operated color display device and display method thereof - Google Patents

Light-operated color display device and display method thereof Download PDF

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CN112596319B
CN112596319B CN202110014126.4A CN202110014126A CN112596319B CN 112596319 B CN112596319 B CN 112596319B CN 202110014126 A CN202110014126 A CN 202110014126A CN 112596319 B CN112596319 B CN 112596319B
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color
light
microcapsule
pixel
thin film
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CN112596319A (en
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张愉
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F1/16757—Microcapsules
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F1/1676—Electrodes
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F1/1677—Structural association of cells with optical devices, e.g. reflectors or illuminating devices
    • 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 
    • G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1685—Operation of cells; Circuit arrangements affecting the entire cell

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  • Optics & Photonics (AREA)
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Abstract

The application provides a light-operated color display device and a display method thereof, the light-operated color display device is provided with a photosensitive thin film transistor below each sub-pixel microcapsule, and the on-off states of a first photosensitive thin film transistor, a second photosensitive thin film transistor and a third photosensitive thin film transistor are controlled through external light, so that the electric fields at the top and the bottom of the first color sub-pixel microcapsule, the second color sub-pixel microcapsule and the third color sub-pixel microcapsule are changed to realize the light emission of the color sub-pixel microcapsule, and the problems that the traditional light-operated color display device is difficult to realize color writing and cannot realize remote fixed-point writing are solved.

Description

Light-operated color display device and display method thereof
Technical Field
The application relates to the technical field of display, in particular to a light-operated color display device and a display method thereof.
Background
The electronic paper (E-paper) is a novel display material, is a bistable display technology based on the electrophoresis principle, has wide application, has the superior performances of ultralow energy consumption, thinness like paper, flexibility and the like of books, can express characters and pictures through black and white and light depth changes of colors, and has very similar display effect to real paper books. At present, electronic paper display screens are widely applied to the fields of electronic readers (electronic books), electronic price boards, smart cards, watches, mobile phones, industrial instruments, dynamic display billboards, medium products and the like.
In the research field of the existing electronic paper, the most widely applied electronic paper technology is the electrophoretic display technology at present, and characters and images distinguished by human eyes can be formed by changing black and white colors through the movement of electrophoretic particles under the action of an electric field, and the electrophoretic technology has some defects, such as the aggregation of electrophoretic particles influences the particle density to cause deviation of the display effect. However, most of the electronic paper on the market still has black and white colors, and related reports are rarely made on color writing. In addition, the magnetic writing has the defects that the magnetic writing can only be performed in a short range, and the magnetic writing cannot be performed in a long range in some special application scenes such as intelligent blackboards. Therefore, it is necessary to develop a color, light-controlled display device.
Disclosure of Invention
In order to solve the above problems, the present invention provides a light-operated color display device and a display method thereof, which aims to solve the problems that the existing display device, such as electronic paper, is difficult to implement color writing and cannot implement remote fixed-point writing.
In one aspect, the present invention provides a light-operated color display device comprising
An upper electrode plate;
the light control circuit comprises a plurality of first photosensitive thin film transistors, a plurality of second photosensitive thin film transistors and a plurality of third photosensitive thin film transistors; and
a microcapsule electrophoretic display layer disposed between the upper electrode plate and the lower electrode plate, comprising: a plurality of first color sub-pixel microcapsules, a plurality of second color sub-pixel microcapsules, and a plurality of third color sub-pixel microcapsules;
wherein the first, second and third photosensitive thin film transistors have a variability in threshold switching voltage under photosensitive conditions; the first photosensitive thin film transistor controls a voltage signal received by the first color sub-pixel microcapsule; the second photosensitive thin film transistor controls a voltage signal received by the second color sub-pixel microcapsule; the third photosensitive thin film transistor controls a voltage signal borne by the third color sub-pixel microcapsule, and by utilizing the characteristic that the leakage current of the photosensitive thin film transistor is increased under the irradiation of external light, a circuit is conducted under the condition that the input voltage is higher than the threshold switch voltage, a junction voltage is generated between the upper electrode plate and the lower electrode plate, and the sub-pixel microcapsule generates light with a specific wavelength under the action of an electric field.
In some embodiments, the first color sub-pixel microcapsule comprises: a microcapsule shell, and first color charged particles and light-shielding charged particles within the microcapsule shell;
the second color sub-pixel microcapsule includes: a microcapsule shell, and second color charged particles and light-shielding charged particles within the microcapsule shell;
the third color sub-pixel microcapsule comprising: a microcapsule shell, and third color charged particles and light-shielding charged particles within the microcapsule shell.
In some embodiments, the charges of the color charged particles and the light-shielding charged particles are opposite.
The first color charged particles, the second color charged particles and the third color charged particles play a role of emitting light in the light-controlled color display device, and the light-shielding charged particles play a role of shielding light in the light-controlled color display device.
In some embodiments, the microcapsule shells of the first color sub-pixel microcapsule, the second color sub-pixel microcapsule and the third color sub-pixel microcapsule further comprise an electrophoretic display liquid only passing blue light, the lower electrode plate is provided with a blue backlight source at one side departing from the upper electrode plate, so that the first color charged particles, the second color charged particles and the third color charged particles emit light under the excitation of the blue backlight source, when the charged particles of the color are above the microcapsule shell and the light-shielding charged particles are below the microcapsule shell, the charged particles of the color can emit light under the excitation of a blue backlight source, the sub-pixel microcapsules of the color emit light, when the charged particles of the color and the light-shielding charged particles are uniformly dispersed in the microcapsule shell, the sub-pixel microcapsule of the color does not emit light.
In some embodiments, the microcapsule shells of the first, second, and third color sub-pixel microcapsules are all colorless and transparent; the size of the microcapsule is 5 μm to 1000 μm, specifically 10 μm to 800 μm, 100 μm to 500 μm, such as 5 μm, 10 μm, 30 μm, 50 μm, 100 μm, 200 μm, 400 μm, 600 μm, 800 μm, 1000 μm, etc.
In some embodiments, the first color charged particles are a first color quantum dot charged material or/and a down-converting nanoparticle material; the second color charged particles are a second color quantum dot charged material or/and a down-conversion nanoparticle material; the third color charged particles are third color quantum dot charged materials or/and down-conversion nanoparticle materials.
In some embodiments, the first color charged particle is a red quantum dot charged material comprising red quantum dots and ligands on the surface of the quantum dots; the second color charged particles are green quantum dot charged materials and comprise green quantum dots and ligands on the surfaces of the quantum dots; the third color charged particles are blue quantum dot charged materials and comprise blue quantum dots and ligands on the surfaces of the quantum dots, and the ligands are used for enabling the surfaces of the quantum dots to be positively or negatively charged.
In some embodiments, the ligand is a negatively charged oleic acid.
In some embodiments, the light-blocking charged particles are negatively charged black particles, such as: carbon black or copper chromite, etc., which are surface-modified by a chemical or physical method.
In some embodiments, the red quantum dot material is one or a combination of zinc sulfide, zinc oxide, gallium nitride, zinc selenide, cadmium sulfide, gallium selenide, cadmium selenide, zinc telluride, cadmium telluride, gallium arsenide, indium phosphide and lead telluride with wavelength at 685nm corresponding to the peak of the luminescence spectrum; the green quantum dot material is one or the combination of zinc sulfide, zinc oxide, gallium nitride, zinc selenide, cadmium sulfide, gallium selenide, cadmium selenide, zinc telluride, cadmium telluride, gallium arsenide, indium phosphide and lead telluride with the wavelength of 506-582nm corresponding to the peak of the luminescence spectrum; the blue quantum dot material is one or the combination of zinc sulfide, zinc oxide, gallium nitride, zinc selenide, cadmium sulfide, gallium selenide, cadmium selenide, zinc telluride, cadmium telluride, gallium arsenide, indium phosphide and lead telluride with the wavelength of 408-492nm corresponding to the peak of the luminescence spectrum.
In some embodiments, the particle size of the red quantum dot material, the green quantum dot material and the blue quantum dot material is between 2nm and 20nm, and specifically, may be 2nm, 5nm, 8nm, 10nm, 12nm, 15nm, 18nm, 20nm, and the like.
In some embodiments, the active layer of the light control thin film transistor is made of a photosensitive material.
In another aspect, the present invention provides a display method of controlling a color display apparatus, the method including: and controlling the on-off states of the first photosensitive thin film transistor, the second photosensitive thin film transistor and the third photosensitive thin film transistor through external light, so that the electric fields at the top and the bottom of the first color sub-pixel microcapsule, the second color sub-pixel microcapsule and the third color sub-pixel microcapsule are changed, and the light emission of the color sub-pixel microcapsule is realized.
In some embodiments, the controlling the switching states of the first, second, and third photosensitive thin film transistors by an external light includes:
under the illumination condition, after voltage is input, the first photosensitive thin film transistor, the second photosensitive thin film transistor and the third photosensitive thin film transistor are turned on, and voltage is generated between the upper electrode plate and the lower electrode plate;
the threshold switching voltage of the first photosensitive thin film transistor, the second photosensitive thin film transistor and the third photosensitive thin film transistor under the condition of external light irradiation is V1The threshold switching voltage in the absence of external light irradiation is V2The input voltage is V3In which V is3Size range of V1≤V3≤V2。
In some embodiments, V2Is 3V, V1is-5V.
In some embodiments, said varying the electric field at the top and bottom of said first, second and third color sub-pixel microcapsules to achieve light emission of said color sub-pixel microcapsules comprises:
when an electric field with the same charge as the color charged particles is applied to the top of the sub-pixel microcapsule and an electric field with the opposite charge to the color charged particles is applied to the bottom of the sub-pixel microcapsule, the color charged particles are gathered at the bottom of the color sub-pixel microcapsule, the shading charged particles are gathered at the top of the color sub-pixel microcapsule, and the color sub-pixel microcapsule does not emit light;
when an electric field opposite to the charges of the color charged particles is applied to the top of the color sub-pixel microcapsule and an electric field with the same charges of the color charged particles is applied to the bottom of the color sub-pixel microcapsule, the color charged particles are gathered at the top of the color sub-pixel microcapsule, the shading charged particles are gathered at the bottom of the color sub-pixel microcapsule, and the color sub-pixel microcapsule does not emit light;
when no voltage is applied to the top and the bottom of the color sub-pixel microcapsule, the color charged particles and the light-shielding charged particles are uniformly dispersed, and the color sub-pixel microcapsule does not emit light.
In some embodiments, the ambient light is laser light.
According to the light-operated color display device, the photosensitive thin film transistor is arranged below the color sub-pixel microcapsule, and the on-off states of the first photosensitive thin film transistor, the second photosensitive thin film transistor and the third photosensitive thin film transistor are controlled through external light, so that electric fields at the top and the bottom of the first color sub-pixel microcapsule, the second color sub-pixel microcapsule and the third color sub-pixel microcapsule are changed to realize the light emission of the color sub-pixel microcapsule, and the problems that the traditional light-operated color display device, such as electronic paper, is difficult to realize color writing and cannot realize remote fixed-point writing are solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a graph of electrical curves of a photosensitive TFT under dark and illuminated conditions according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a light-operated color display device provided in an embodiment of the present invention in an unlit condition;
fig. 3 is a schematic structural diagram of a light-operated color display device under illumination conditions provided in an embodiment of the present application.
Wherein the reference numbers indicate:
11-a lower electrode plate; 121-a first photosensitive thin film transistor; 122-a second photosensitive thin film transistor; 123-a third photosensitive thin film transistor; 13-electrophoretic display liquid; 14-light-shielding charged particles; 151-first color charged particles; 152-charged particles of a second color; 153-third color charged particles; 16-an upper electrode plate; 17-a backlight source; 18-a microcapsule shell; 19-first color sub-pixel microcapsules; 20-second color sub-pixel microcapsules; 21-third color sub-pixel microcapsules.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Most of the electronic paper on the market still has black and white colors, and related reports are rarely made on color writing. In addition, the magnetic writing at present has the defects that the magnetic writing can only be operated in a short range, and the long-range fixed-point writing cannot be realized in some special application scenes such as intelligent blackboards and the like.
To solve the above problems, embodiments of the present invention provide a light-controlled color display device and a display method thereof. The following are detailed below.
First, referring to fig. 1-3, an embodiment of the present invention provides a light-controlled color display device, as shown in fig. 1, including an upper electrode plate 16, a lower electrode plate 11, and a microcapsule electrophoretic display layer disposed between the upper electrode plate 16 and the lower electrode plate 11. The lower electrode plate 11 is provided with a light control circuit, and the light control circuit includes a plurality of first photosensitive thin film transistors 121, a plurality of second photosensitive thin film transistors 122, and a plurality of third photosensitive thin film transistors 123.
Wherein the microcapsule electrophoretic display layer comprises: a plurality of first-color sub-pixel microcapsules 19, a plurality of second-color sub-pixel microcapsules 20, and a plurality of third-color sub-pixel microcapsules 21;
the first photo-sensitive thin film transistor 121, the second photo-sensitive thin film transistor 122 and the third photo-sensitive thin film transistor 123 have a threshold switching voltage variability under a photo-sensing condition.
The first photosensitive thin film transistor 121 controls the voltage signal received by the first color sub-pixel microcapsule 19; the second photosensitive thin film transistor 122 controls the voltage signal received by the second color sub-pixel microcapsule 20; the third photosensitive thin film transistor 123 controls the voltage signal received by the third color sub-pixel microcapsule 21.
Specifically, the upper electrode plate 16 is made of a transparent material, so that the photosensitive thin film transistor can sufficiently absorb external light.
Specifically, the active layer of the photosensitive thin film transistor is made of a photosensitive material, so that the photosensitive thin film transistor can be regulated by light, and the variability of threshold voltage is realized.
Specifically, the light-operated color display device is electronic paper.
In one embodiment, the light control circuit includes a plurality of sensing signal lines and a plurality of scanning signal lines, and a plurality of switching thin film transistors and a plurality of photosensitive thin film transistors, the above signal lines and transistors form a plurality of sub-light control circuits distributed in an array, each sub-light control circuit corresponds to one sub-pixel microcapsule, and the sub-pixel microcapsule is one of a first color sub-pixel microcapsule 19, a second color sub-pixel microcapsule 20, and a third color sub-pixel microcapsule 21.
In the embodiment of the present invention, the display principle of the light-operated color display device is as follows: as shown in fig. 1, a graph of a current (a) and a voltage (V) of the photosensitive tft under dark regulation (dark) and ambient light (photo), wherein the leakage current of the photosensitive tft under ambient light increases according to an embodiment of the present invention, and a circuit is turned on when the threshold switching voltage is higher than the threshold switching voltage by using the characteristic that the leakage current of the photosensitive tft increases under ambient light, so that the switching tft is turned on. A voltage is generated between the upper electrode plate 16 and the lower electrode plate 11, and the sub-pixel microcapsules generate light with a specific wavelength under the action of an electric field.
In the light-operated color display device provided by the invention, the photosensitive thin film transistors are arranged below the color sub-pixel microcapsules, and the on-off states of the first photosensitive thin film transistor 121, the second photosensitive thin film transistor 122 and the third photosensitive thin film transistor 123 are controlled by external light, so that the electric fields at the top and the bottom of the first color sub-pixel microcapsule 19, the second color sub-pixel microcapsule 20 and the third color sub-pixel microcapsule 21 are changed to realize the light emission of the color sub-pixel microcapsules, and the problems that the traditional light-operated color display device, such as electronic paper, is difficult to realize color writing and cannot realize remote fixed-point writing are solved.
In another specific embodiment of the present invention, on the basis of the above embodiment, the first color sub-pixel microcapsule 19 includes: a microcapsule shell 18, and the first color charged particles 151 and the light-shielding charged particles 14 inside the microcapsule shell 18;
the second color sub-pixel microcapsule 20 includes: a microcapsule shell 18, and second color charged particles 152 and light-shielding charged particles 14 within the microcapsule shell 18;
the third color sub-pixel microcapsule 21 includes: a microcapsule shell 18, and third color charged particles 153 and light-shielding charged particles 14 inside the microcapsule shell 18.
The first color charged particles 151, the second color charged particles 152, and the third color charged particles 153 have different charges from the light-shielding charged particles 14, for example: when the first color charged particles 151, the second color charged particles 152, and the third color charged particles 153 are charged with positive charges, the light-shielding charged particles 14 are charged with negative charges, and when the first color charged particles 151, the second color charged particles 152, and the third color charged particles 153 are charged with negative charges, the light-shielding charged particles 14 are charged with positive charges. The light-shielding charged particles 14 contained in the first color sub-pixel micro capsule 19, the second color sub-pixel micro capsule 20, and the third color sub-pixel micro capsule 21 may be the same or different in kind.
Preferably, the ratio of the volume content of the light-shielding charged particles 14 to the volume content of the color charged particles is 1: 1.
the mass or volume content ratio of the light-shielding charged particles 14 and the color charged particles in the microcapsule shell 18 is not particularly limited as long as the light-shielding charged particles 14 do not affect the light emission of the color charged particles under the voltage.
In the embodiment of the present invention, the first color charged particles 151, the second color charged particles 152, and the third color charged particles 153 play a role of emitting light in the light-controlled color display device, and the light-shielding charged particles 14 play a role of shielding light in the light-controlled color display device. By providing two different kinds of charged particles in the microcapsule shell 18, the positional relationship of the two kinds of charged particles in the microcapsule shell 18 can be changed by a voltage, and the light emission of the color sub-pixel microcapsule can be realized.
In some embodiments, the electrophoretic display liquid 13 only passing blue light is further included in the microcapsule shell 18 of the first color sub-pixel microcapsule 19, the second color sub-pixel microcapsule 20 and the third color sub-pixel microcapsule 21, the lower electrode plate 11 is provided with a blue backlight 17 at a side facing away from the upper electrode plate 16, so that the first color charged particles 151, the second color charged particles 152 and the third color charged particles 153 emit light under excitation of the blue backlight 17, when the color charged particles are above the microcapsule shell 18 and the light-shielding charged particles 14 are below the microcapsule shell 18, the color charged particles will emit light under excitation of the blue backlight 17, the color sub-pixel microcapsules emit light, when the color charged particles and the light-shielding charged particles 14 are uniformly dispersed in the microcapsule shell 18, the sub-pixel microcapsules of said color do not emit light.
For better understanding of the above embodiments of the present invention, the following two cases are taken as examples and specifically described:
in the first case, the first color charged particles 151, the second color charged particles 152, and the third color charged particles 153 are positively charged, and the light-shielding charged particles 14 are negatively charged. When the upper electrode plate 16 is a cathode and the lower electrode plate 11 is an anode, the charged particles of the three colors are gathered at the upper end of the microcapsule shell 18, and the light-shielding charged particles 14 are gathered at the lower end of the microcapsule shell 18, and excited by the backlight source 17, so that the light emission of the color sub-pixel microcapsule can be realized.
In the second case, the first color charged particles 151, the second color charged particles 152, and the third color charged particles 153 are negatively charged, and the light-shielding charged particles 14 are positively charged. When the upper electrode plate 16 is an anode and the lower electrode plate 11 is a cathode, the charged particles of the three colors are gathered at the upper end of the microcapsule shell 18, and the light-shielding charged particles 14 are gathered at the lower end of the microcapsule shell 18, and excited by the backlight source 17, so that the light emission of the color sub-pixel microcapsule can be realized.
As shown in fig. 3, the light-shielding charged particles 14 and the first color charged particles 151 are distributed in the microcapsule shell 18 under the illumination condition of the first color sub-pixel microcapsule 19 by the electric field of the upper and lower electrode plates, and the arrows represent the external light source.
According to the invention, the blue light is used as the backlight source 17, so that the luminous flux can be greatly improved, the energy utilization rate and the brightness are further increased, the brightness of the colored electronic paper is improved, and the problem of insufficient brightness caused by that most of light is absorbed by the colored dye in the traditional light-operated color display device technology is solved.
In some embodiments, the microcapsule shells 18 of the first color sub-pixel microcapsule 19, the second color sub-pixel microcapsule 20, and the third color sub-pixel microcapsule 21 are all colorless and transparent; the microcapsules have a size of 5 μm to 1000 μm, 10 μm to 800 μm, 100 μm and 500 μm, for example 5 μm, 10 μm, 30 μm, 50 μm, 100 μm, 200 μm, 400 μm, 600 μm, 800 μm, 1000 μm and the like.
In some embodiments, the first color charged particles 151 are a first color quantum dot charged material or/and a down-converting nanoparticle material; the second color charged particles 152 are a second color quantum dot charged material or/and a down-conversion nanoparticle material; the third color charged particles 153 are third color quantum dot charged materials or/and down-conversion nanoparticle materials.
Quantum Dots (QDs), referred to as nanoparticles (i.e., nanocrystals), are semiconductor structures having a nanometer unit size, and QDs have a zero-dimensional structure that can be converted to different colors including red, green, and blue depending on the size of the QD. In an embodiment of the present invention, the first color charged particles 151 are red quantum dot charged materials, including red quantum dots and ligands on the surfaces of the red quantum dots; the second color charged particles 152 are green quantum dot charged materials, and include green quantum dots and ligands on the surfaces of the quantum dots; the third color charged particles 153 are blue quantum dot charged materials, and include blue quantum dots and ligands on the surfaces of the blue quantum dots, and the ligands are used for positively or negatively charging the surfaces of the quantum dots.
Specifically, the particle diameters of the red quantum dot material, the green quantum dot material and the blue quantum dot material in the above embodiments are between 2nm and 20nm, specifically, may be 2nm, 5nm, 8nm, 10nm, 12nm, 15nm, 18nm, 20nm, and the like, and in a specific embodiment, is between 5nm and 15 nm. The ligand is negatively charged oleic acid and the light-blocking charged particles 14 are negatively charged black particles, such as: carbon black or copper chromite, etc., which are surface-modified by a chemical or physical method.
In some embodiments, the red quantum dot material is one or a combination of zinc sulfide, zinc oxide, gallium nitride, zinc selenide, cadmium sulfide, gallium selenide, cadmium selenide, zinc telluride, cadmium telluride, gallium arsenide, indium phosphide and lead telluride with wavelength at 685nm corresponding to the peak of the luminescence spectrum; the green quantum dot material is one or the combination of zinc sulfide, zinc oxide, gallium nitride, zinc selenide, cadmium sulfide, gallium selenide, cadmium selenide, zinc telluride, cadmium telluride, gallium arsenide, indium phosphide and lead telluride with the wavelength of 506-582nm corresponding to the peak of the luminescence spectrum; the blue quantum dot material is one or the combination of zinc sulfide, zinc oxide, gallium nitride, zinc selenide, cadmium sulfide, gallium selenide, cadmium selenide, zinc telluride, cadmium telluride, gallium arsenide, indium phosphide and lead telluride with the wavelength of 408-one-shot 492nm corresponding to the peak of the luminescence spectrum.
The quantum dot is a semiconductor nano material with high luminous efficiency, and the invention combines the quantum dot with the microcapsule electrophoretic display technology, controls the color of the color sub-pixel microcapsule by controlling the direction of voltage, and combines the color to form light with required color, thereby further being capable of manufacturing a light-operated color display device with excellent property; meanwhile, under the excitation of blue light as a backlight source 17, the quantum dots serving as the luminescent material can also widen the color gamut and increase the visual angle; in addition, the quantum dots exist in a liquid environment, and compared with the traditional film forming technology, the service life and the luminous efficiency are improved.
It should be noted that, in the above-mentioned embodiment of the light-operated color display device, only the above-mentioned structure is described, and it should be understood that, in addition to the above-mentioned structure, the light-operated color display device of the embodiment of the present invention may further include any other necessary structures of the light-operated color display device, such as an adhesive layer, a protective film, etc., as required, which is the same as the prior art, and is omitted here.
In addition, on the basis of the above embodiment of the light-operated color display device, the present invention also provides a display method of the light-operated color display device, the method including: the light emission of the color sub-pixel microcapsules is realized by controlling the on-off state of the first photosensitive thin film transistor 121, the second photosensitive thin film transistor 122 and the third photosensitive thin film transistor 123 through the external light, so that the electric fields at the top and the bottom of the first color sub-pixel microcapsule 19, the second color sub-pixel microcapsule 20 and the third color sub-pixel microcapsule 21 are changed.
By adopting the display method of the light-operated color display device described in the above embodiment, it is possible to solve the problems that the conventional light-operated color display device is difficult to implement color writing and cannot implement remote writing.
On the basis of the above embodiments, in an embodiment of the present invention, the controlling the switching states of the first tft 121, the second tft 122, and the third tft 123 by external light includes:
under the illumination condition, after the voltage is input, the first light sensing thin film transistor 121, the second light sensing thin film transistor 122 and the third light sensing thin film transistor 123 are turned on, and the voltage is generated between the upper electrode plate 16 and the lower electrode plate 11.
The threshold switching voltage of the first photosensitive thin film transistor 121, the second photosensitive thin film transistor 122 and the third photosensitive thin film transistor 123 under the condition of external light irradiation is V1The threshold switching voltage in the absence of external light irradiation is V2The input voltage is V3Wherein the range is V1≤V3≤V2。
In particular, V2Is 3V, V1is-5V.
Specifically, the changing the electric fields at the top and the bottom of the first color sub-pixel microcapsule 19, the second color sub-pixel microcapsule 20, and the third color sub-pixel microcapsule 21 to realize the light emission of the color sub-pixel microcapsules includes:
when an electric field with the same charge as the charged color particles is applied to the top of the sub-pixel microcapsule and an electric field with the opposite charge to the charged color particles is applied to the bottom of the sub-pixel microcapsule, the charged color particles gather at the bottom of the sub-pixel microcapsule, the light-shielding charged particles 14 gather at the top of the sub-pixel microcapsule, and the sub-pixel microcapsule does not emit light;
when an electric field opposite to the charged charges of the color charged particles is applied to the top of the color sub-pixel microcapsule and an electric field with the same charged charges of the color charged particles is applied to the bottom of the color sub-pixel microcapsule, the color charged particles are gathered at the top of the color sub-pixel microcapsule, the light-shielding charged particles 14 are gathered at the bottom of the color sub-pixel microcapsule, and the color sub-pixel microcapsule does not emit light;
when no voltage is applied to the top and bottom of the color sub-pixel microcapsule, the color charged particles and the light-shielding charged particles 14 are uniformly dispersed, and the color sub-pixel microcapsule does not emit light.
In some embodiments, the external light is laser light, and in a preferred embodiment of the present invention, the illumination intensity of the laser light is 3mw or more, and in a specific embodiment, in a range of 3mw to 12 mw.
On the basis of the foregoing embodiment, in another embodiment of the present invention, a display method capable of adjusting the brightness of light of an optically controlled color display device is further provided, and specifically, the number of the color charged particles gathered at the top of the color sub-pixel microcapsule is adjusted by adjusting the magnitude of the input voltage, so as to realize the controllable brightness of light.
In the above embodiments, the descriptions of the embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again.
The present invention provides a light-operated color display device and a display method thereof, which are described in detail, and the present invention is illustrated in principle and embodiments by applying specific examples, and the above description of the embodiments is only provided to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A light-operated color display device is characterized by comprising
An upper electrode plate;
the light control circuit comprises a plurality of first photosensitive thin film transistors, a plurality of second photosensitive thin film transistors and a plurality of third photosensitive thin film transistors; and
a microcapsule electrophoretic display layer disposed between the upper electrode plate and the lower electrode plate, comprising: a plurality of first color sub-pixel microcapsules, a plurality of second color sub-pixel microcapsules, and a plurality of third color sub-pixel microcapsules;
wherein the first, second and third photosensitive thin film transistors have a variability in threshold switching voltage under photosensitive conditions; the first photosensitive thin film transistor controls a voltage signal received by the first color sub-pixel microcapsule; the second photosensitive thin film transistor controls a voltage signal received by the second color sub-pixel microcapsule; and the third photosensitive thin film transistor controls a voltage signal borne by the third color sub-pixel microcapsule.
2. The light-controlled color display device according to claim 1,
the first color sub-pixel microcapsule includes: a microcapsule shell, and first color charged particles and light-shielding charged particles within the microcapsule shell;
the second color sub-pixel microcapsule includes: a microcapsule shell, and second color charged particles and light-shielding charged particles within the microcapsule shell;
the third color sub-pixel microcapsule comprising: a microcapsule shell, and third color charged particles and light-shielding charged particles within the microcapsule shell.
3. The light-controlled color display device according to claim 2, wherein the light-shielding charged particles are negatively charged black particles.
4. The light-operated color display device according to claim 2, wherein the microcapsule shells of the first, second and third color sub-pixel microcapsules further comprise an electrophoretic display liquid which passes only blue light, and the lower electrode plate is provided with a blue backlight source at a side facing away from the upper electrode plate.
5. The light-controlled color display device according to claim 2, wherein the first color charged particles are a first color quantum dot charged material or/and a down-converting nanoparticle material; the second color charged particles are a second color quantum dot charged material or/and a down-conversion nanoparticle material; the third color charged particles are third color quantum dot charged materials or/and down-conversion nanoparticle materials.
6. The light-operated color display device according to claim 1, wherein the first, second and third color sub-pixel microcapsules have a diameter of 5 μm to 1000 μm.
7. The light-operated color display device according to claim 1, wherein the photosensitive thin film transistor comprises an active layer made of a photosensitive material.
8. A display method of a light-operated color display device according to any one of claims 1 to 7, characterized in that the method comprises: and controlling the on-off states of the first photosensitive thin film transistor, the second photosensitive thin film transistor and the third photosensitive thin film transistor through external light, so that the electric fields at the top and the bottom of the first color sub-pixel microcapsule, the second color sub-pixel microcapsule and the third color sub-pixel microcapsule are changed, and the light emission of the color sub-pixel microcapsule is realized.
9. The method according to claim 8, wherein the controlling the switching states of the first, second and third light-sensitive thin film transistors by external light comprises:
under the illumination condition, after voltage is input, the first photosensitive thin film transistor, the second photosensitive thin film transistor and the third photosensitive thin film transistor are turned on, and voltage is generated between the upper electrode plate and the lower electrode plate;
the threshold switching voltage of the first photosensitive thin film transistor, the second photosensitive thin film transistor and the third photosensitive thin film transistor under the condition of external light irradiation is V1The threshold switching voltage in the absence of external light irradiation is V2The input voltage is V3Said V is3Size range of V1≤V3≤V2。
10. The display method according to claim 8, wherein the external light is laser light.
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CN101527118A (en) * 2007-09-27 2009-09-09 统宝光电股份有限公司 Display device capable of sensing ambient light
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