CN110955093A - Display panel, preparation method thereof and display device - Google Patents
Display panel, preparation method thereof and display device Download PDFInfo
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- CN110955093A CN110955093A CN201911323131.2A CN201911323131A CN110955093A CN 110955093 A CN110955093 A CN 110955093A CN 201911323131 A CN201911323131 A CN 201911323131A CN 110955093 A CN110955093 A CN 110955093A
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- G—PHYSICS
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- 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
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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
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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
- G02F1/1675—Constructional details
- G02F1/16755—Substrates
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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
- G02F1/1675—Constructional details
- G02F1/1679—Gaskets; Spacers; Sealing of cells; Filling or closing of cells
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The embodiment of the invention provides a display panel, a preparation method thereof and a display device. The display panel comprises a first substrate and a second substrate which are oppositely arranged, and a color display layer arranged between the first substrate and the second substrate, wherein the color display layer comprises a dispersion medium, and optical crystal particles and black particles suspended in the dispersion medium, and the color display layer is used for displaying a black state or displaying a set color in a set gray scale. The invention adopts the color display layer comprising the optical crystal particles and the black particles, realizes color display and switching between a black state and a color state by controlling the arrangement distance of the optical crystal particles, and effectively solves the problem that the existing electronic paper can not realize color display.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a preparation method thereof and a display device.
Background
With the development of display technologies, users have higher requirements for display products, and a large number of new display technologies, such as Electronic Paper (E-Paper) displays, have emerged in recent years. The electronic paper display device is a general name of a technology, is an ultrathin and ultralight display screen, has a display effect close to a natural paper effect, is free from reading fatigue, and has the characteristics of comfortable reading, ultrathin, light weight, flexibility, ultralow power consumption and the like. The electronic paper display device has the working principle that two layers of transparent films are provided with two kinds of grains with static electricity, the two kinds of grains are respectively provided with positive static electricity and negative static electricity, and the positions of the grains are moved by utilizing positive and negative electrodes arranged outside the films according to the principle that homopolar repulsion and heteropolar attraction are utilized to arrange the grains into a character shape or a figure.
At present, the electronic paper cannot realize full-color display, and the popularization and application of the electronic paper technology are greatly reduced. Therefore, how to realize full-color display of electronic paper is a technical problem to be solved urgently in the field.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a display panel, a manufacturing method thereof, and a display device, so as to solve the problem that the existing electronic paper cannot realize color display.
In order to solve the above technical problem, an embodiment of the present invention provides a display panel including a first substrate and a second substrate which are oppositely disposed, and a color display layer disposed between the first substrate and the second substrate, wherein the color display layer includes a dispersion medium, and a photo crystal particle and a black particle suspended in the dispersion medium, and the color display layer is used for displaying a black state or displaying a set color in a set gray scale.
Optionally, the photonic crystal particles include photonic crystal particles and a magnetic film wrapping the photonic crystal particles.
Optionally, the diameter of the photonic crystal particle is 1 μm to 3 μm, the thickness of the magnetic film is 20nm to 50nm, and the diameter of the black particle is 1nm to 10 nm.
Optionally, the photonic crystal particles comprise polystyrene microspheres and titanium dioxide wrapping the polystyrene microspheres; the material of the magnetic film comprises ferroferric oxide Fe3O4Or RFe2And R is one or more of terbium Tb, dysprosium Dy and samarium Sm.
Optionally, the first substrate includes a first base and a display driving layer disposed on a side of the first base facing the second substrate; the second substrate comprises a second base and a display definition layer arranged on one side of the second base facing the first substrate; the color display layer is arranged between the display driving layer and the display definition layer, the color display layer further comprises a plurality of isolation columns for isolating a plurality of display units and a magnetic layer arranged on the side walls of the isolation columns, and the magnetic layer is used for adsorbing the optical crystal particles in an initial state.
Optionally, in the display unit, the display driving layer includes a first electrode and a second electrode, and the display definition layer includes a black matrix for shielding the adsorbed photonic crystal particles; or, in the display unit, the display driving layer includes a first electrode, and the display defining layer includes a second electrode and a black matrix for shielding the adsorbed photonic crystal particles.
Optionally, the black matrix forms a non-display area of the display unit, and an area outside the black matrix forms a display area of the display unit; the first electrode and the second electrode are used for forming an electric field, and the electric field drives the optical crystal particles to move from the non-display area to the display area and to be arranged in the display area at a set interval, so that the display area displays a set color at a set gray scale.
Optionally, the set color comprises red, green or blue.
Optionally, the display definition layer further comprises a flat layer disposed between the black matrices.
The embodiment of the invention also provides a display device which comprises the display panel.
The embodiment of the invention also provides a preparation method of the display panel, which comprises the following steps:
preparing a first substrate including a color display layer, and preparing a second substrate; the color display layer comprises a dispersion medium, and optical crystal particles and black particles suspended in the dispersion medium, and is used for displaying a black state or displaying a set color in a set gray scale;
and aligning and pressing the first substrate and the second substrate.
Optionally, preparing a first substrate comprising a color display layer comprises:
forming a display driving layer on a first substrate;
forming a plurality of isolation columns for isolating a plurality of display units on the display driving layer;
forming a magnetic layer on the side wall of the isolation column;
and dripping a color display solution in a space surrounded by the isolation columns, wherein the color display solution comprises a dispersion medium, and optical crystal particles and black particles suspended in the dispersion medium.
Optionally, the photonic crystal particles include photonic crystal particles and a magnetic film wrapping the photonic crystal particles.
Optionally, the diameter of the photonic crystal particle is 1 μm to 3 μm, the thickness of the magnetic film is 20nm to 50nm, and the diameter of the black particle is 1nm to 10 nm.
Optionally, the photonic crystal particles comprise polystyrene microspheres and titanium dioxide wrapping the polystyrene microspheres; the material of the magnetic film comprises ferroferric oxide or RFe2And R is one or more of terbium Tb, dysprosium Dy and samarium Sm.
The embodiment of the invention provides a display panel, a preparation method thereof and a display device, wherein a color display layer comprising optical crystal particles and black particles is adopted, and the arrangement distance of the optical crystal particles is controlled, so that not only is color display realized, but also the switching between a black state and a color state is realized, and the problem that the existing electronic paper cannot realize color display is effectively solved.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings 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 example serve to explain the principles of the invention and not to limit the invention. The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
FIG. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic structural diagram of a photonic crystal particle according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a display panel according to a first embodiment of the present invention;
FIG. 5 is a diagram of a photo die showing red color according to a first embodiment of the present invention;
FIG. 6 is a diagram of a photonic crystal device showing green color according to a first embodiment of the present invention;
FIG. 7 is a diagram of a photonic crystal device showing blue color according to a first embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating a display driving layer according to a first embodiment of the present invention;
FIG. 9 is a schematic view showing the first embodiment of the present invention after forming the spacers and the magnetic layer;
FIG. 10 is a diagram illustrating a display definition layer according to a first embodiment of the present invention;
FIG. 11 is a schematic structural diagram of a display panel according to a second embodiment of the present invention;
fig. 12 is a diagram of a photo-crystal device showing red, green and blue colors according to a second embodiment of the present invention.
Description of reference numerals:
1-photonic crystal particles; 2-a magnetic film; 10 — a first substrate;
20 — a second substrate; 30-display driving layer; 31-a thin film transistor;
32 — a first electrode; 33 — a second electrode; 40-display definition layer;
41-a flat layer; 42-black matrix; 50-color display layer;
51-an isolation column; 52-magnetic layer; 53-photonic particles;
54-black particles; 100-a display unit; 200 — isolation matrix.
Detailed Description
The following describes embodiments with reference to the drawings. Note that the embodiments may be implemented in a plurality of different forms. Those skilled in the art can easily understand the fact that the modes and contents can be changed into various forms without departing from the spirit and scope of the present invention. Therefore, the present invention should not be construed as being limited to the description of the following embodiments.
In the drawings, the size of each component, the thickness of layers, or regions may be exaggerated for clarity. Therefore, the present invention is not necessarily limited to the dimensions, and the shapes and sizes of the respective members in the drawings do not reflect actual proportions. In addition, the drawings schematically show desirable examples, and one embodiment of the present invention is not limited to the shapes, numerical values, and the like shown in the drawings.
The ordinal numbers such as "first", "second", "third", and the like in the present specification are provided for avoiding confusion among the constituent elements, and are not limited in number.
In this specification, for convenience, terms indicating orientation or positional relationship such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are used to explain positional relationship of constituent elements with reference to the drawings, only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. The positional relationship of the components is changed as appropriate in accordance with the direction in which each component is described. Therefore, the words described in the specification are not limited to the words described in the specification, and may be replaced as appropriate.
In this specification, a transistor refers to an element including at least three terminals, i.e., a gate electrode, a drain electrode, and a source electrode. The transistor has a channel region between a drain electrode (drain electrode terminal, drain region, or drain electrode) and a source electrode (source electrode terminal, source region, or source electrode), and current can flow through the drain electrode, the channel region, and the source electrode. Note that in this specification, a channel region refers to a region where current mainly flows.
In the case of using transistors of opposite polarities, or in the case of changing the direction of current flow during circuit operation, the functions of the "source electrode" and the "drain electrode" may be interchanged. Therefore, in this specification, "source electrode" and "drain electrode" may be exchanged with each other.
In this specification, "electrically connected" includes a case where constituent elements are connected together by an element having some kind of electrical action. The "element having a certain electric function" is not particularly limited as long as it can transmit and receive an electric signal between connected components. Examples of the "element having some kind of electric function" include not only an electrode and a wiring but also a switching element such as a transistor, a resistor, an inductor, a capacitor, other elements having various functions, and the like.
In the present specification, "parallel" means a state in which an angle formed by two straight lines is-10 ° or more and 10 ° or less, and therefore, includes a state in which the angle is-5 ° or more and 5 ° or less. The term "perpendicular" refers to a state in which the angle formed by two straight lines is 80 ° or more and 100 ° or less, and therefore includes a state in which the angle is 85 ° or more and 95 ° or less.
In the present specification, "film" and "layer" may be interchanged with each other. For example, the "conductive layer" may be sometimes replaced with a "conductive film". Similarly, the "insulating film" may be replaced with an "insulating layer".
In order to solve the problem that the existing electronic paper cannot realize color display, the embodiment of the invention provides a novel display technology, and full-color display is formed by utilizing photonic crystal photonic particles and black particles. Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and fig. 2 is a sectional view taken along a direction a-a in fig. 1. As shown in fig. 1, the main structure of the display panel includes a plurality of display cells 100 and a barrier matrix 200 in a plane parallel to the display panel, the plurality of display cells 100 being arranged in a matrix manner, each display cell 100 being for displaying a black state or displaying a set color in a set gray scale, the barrier matrix 200 being disposed between the display cells 100 for separating adjacent display cells 100. The set colors may be red R, green G and blue B, each display unit 100 is used as a sub-pixel, and three display units 100 respectively displaying RGB form a pixel, so as to realize black state or color display. As shown in fig. 2, the display panel includes a first substrate 10 and a second substrate 20 disposed opposite to each other in a plane perpendicular to the display panel, a display driving layer 30 disposed on a surface of the first substrate 10 facing the second substrate 20, a display defining layer 40 disposed on a surface of the second substrate 20 facing the first substrate 10, a plurality of display cells 100 and an isolation matrix 200 disposed between the display driving layer 30 and the display defining layer 40, the isolation matrix 200 disposed between the display cells 100. The first substrate 10 and the display driving layer 30 serve as a first substrate, the second substrate 20 and the display defining layer 40 serve as a first substrate, the display unit 100 and the isolation matrix 200 serve as a color display layer, and the display unit 100 is used for displaying a black state or displaying a set color in a set gray scale.
Each display unit 100 includes a dispersion medium, and photo crystal particles and black particles suspended in the dispersion medium, the black particles are used for realizing black state display of the display unit, and the photo crystal particles are used for realizing the display unit to set gray level display set colors such as red R, green G or blue B by changing an arrangement pitch. Therefore, the color display layer of the embodiment of the invention is the light emitting control layer for realizing light emitting control based on the arrangement of the optical crystal particles and the black particles. Specifically, for a display area, when the black particles are suspended in the display area, the light cannot normally pass through the display area, and the display area is in a black state; when the optical crystal particles are suspended in the display area, the arrangement of the optical crystal particles with different intervals can realize the reflection of light rays with different wavelengths, and the display area presents corresponding red, green or blue.
Photonic crystals refer to a special lattice structure that reacts to light, as do semiconductor materials that periodically exhibit ions at lattice nodes (sites where atoms are located), and photonic crystals are materials that periodically exhibit low refractive index (e.g., artificially created air holes) at certain locations in high refractive index materials. Since a periodic structure formed by alternately arranging materials with high and low refractive indexes can generate a photonic Band Gap (Band Gap), similar to a forbidden Band in a semiconductor, the photonic crystal can modulate electromagnetic waves with corresponding wavelengths. When electromagnetic waves are transmitted in a photonic crystal structure, the electromagnetic waves are modulated due to Bragg scattering, energy of the electromagnetic waves forms an energy band structure, a band gap, namely a photonic band gap, is formed between the energy band and the energy band, all photons with energy in the photonic band gap cannot enter the photonic crystal, and distances between the periodically arranged low-refractive-index sites in the photonic crystal are the same, so that the photonic crystal with the periodically arranged low-refractive-index sites at a certain distance only generates an energy band effect on the light waves with certain frequency. That is, only light of a certain frequency is completely inhibited from propagating in a photonic crystal having a certain periodic distance.
The embodiment of the invention utilizes the characteristic of the photonic crystal, arranges the color display layer comprising the photonic crystal particles, controls the movement of the photonic crystal particles by applying an electric field and realizes the arrangement of different intervals, and selectively reflects light rays with corresponding wavelengths by the arrangement of different intervals to realize the display of different colors. For example, the smaller the distance between the photo crystal particles, the smaller the wavelength of the light selectively reflected by the photo crystal particles, and when the wavelength of the light selectively reflected is between 450nm and 490nm, the display unit in which the photo crystal particles are located displays blue. The distance between the optical crystal particles is increased, so that the wavelength of the light selectively reflected by the optical crystal particles is increased, and when the wavelength of the light selectively reflected is between 620nm and 770nm, the display unit in which the optical crystal particles are positioned presents red display. Similarly, when the wavelength of the selected reflected light is between 490nm and 580nm, the display unit is in green display.
Fig. 3 is a schematic structural diagram of a photonic crystal particle according to an embodiment of the present invention. As shown in fig. 3, the photonic crystal particles according to the embodiment of the present invention are photonic crystals having magnetic properties, and the photonic crystal particles 1 serving as cores are wrapped with the magnetic film 2 serving as shells in a shell-core structure. The photonic crystal particles 1 are spherical, have the diameter of 1-3 mu m, and can be prepared by one or more of a self-assembly method, an etching method and a suspension coating method. Wherein the photonic crystal particle 1 is also of a shell-core structure, the material of the core comprises Polystyrene (PS) microspheres, and the material of the shell comprises titanium dioxide (TiO)2). For example, Polystyrene (PS) microspheres with the diameter of 1-2 μm are adopted to prepare three-dimensional photonic crystals by a vertical deposition self-assembly method, and a certain proportion of titanium dioxide material (TiO) is filled at the same time2) The modification is performed so that the whole becomes electronegative. The magnetic film 2 is used as a magnetic wrapping layer of a shell-core structure, is of a transparent film structure, has the thickness of 20 nm-50 nm, and can be prepared by a deposition method in a photonic crystal particle solution or a spin coating method. The magnetic film 2 can adopt ferroferric oxide Fe3O4Or RFe2Alloy and other materials, wherein R is one or more of terbium Tb, dysprosium Dy and samarium Sm. The black particles in the embodiment of the invention are spherical, have the diameter of 1 nm-10 nm and can be prepared by adopting nigrosine or black pigments such as carbon black and the like.
The display panel provided by the embodiment of the invention can be realized in various ways, and the technical scheme of the embodiment of the invention is described in detail through specific embodiments.
Fig. 4 is a schematic structural diagram of a display panel according to a first embodiment of the present invention, which illustrates a structure of a display unit in a plane perpendicular to the display panel. As shown in fig. 4, the display panel of the present embodiment includes a first substrate 10 and a second substrate 20, a display driving layer 30 disposed on a surface of the first substrate 10 facing the second substrate 20, a display defining layer 40 disposed on a surface of the second substrate 20 facing the first substrate 10, and a color display layer 50 disposed between the display driving layer 30 and the display defining layer 40, the color display layer 50 being used to display a black state or display a set color in a set gray scale under the control of the display driving layer 30. The main structure of the display driving layer 30 includes a thin film transistor 31, a first electrode 32 and a second electrode 33, the display defining layer 40 includes a flat layer 41 and a black matrix 42, and the color display layer 50 includes an isolation pillar 51 separating adjacent display cells, a magnetic layer 52 disposed on a sidewall of the isolation pillar 51, a dispersion medium (not shown) disposed in an enclosed space defined by the isolation pillar 51, and photo crystal particles 53 and black particles 54 suspended in the dispersion medium. Wherein the spacers 51 of the plurality of display units together constitute an isolation matrix.
The present embodiment shows that the driving layer 30 includes a thin film transistor 31, a first electrode 32, and a second electrode 33, where the thin film transistor 31 specifically includes: a first insulating layer disposed on the first substrate 10, an active layer disposed on the first insulating layer, a second insulating layer covering the active layer, a gate line (not shown) and a gate electrode disposed on the second insulating layer, a third insulating layer covering the gate line and the gate electrode, a data line (not shown), a source electrode and a drain electrode disposed on the third insulating layer, and a fourth insulating layer covering the data line, the source electrode and the drain electrode. The first electrode 32 and the second electrode 33 are disposed on the fourth insulating layer, and the first electrode 32 is connected to the drain electrode through the via hole. When the gate line outputs a turn-on signal, the number of the data line output by the data line is input to the first electrode 32 through the thin film transistor 31, so that the first electrode 32 and the second electrode 33 form a horizontal electric field which drives the movement of the photonic particles 53 and is arranged in a specified manner. In this embodiment, the first electrode 32 is a stripe electrode, the second electrode 33 may be a stripe electrode or a planar electrode, and a horizontal electric field is formed between the first electrode 32 and the second electrode 33. In practical implementation, the first electrode 32 and the second electrode 33 may be disposed in the same layer, formed through the same patterning process, or disposed in different structural layers, and the embodiment is not limited in this respect.
The present embodiment shows that the definition layer 40 includes a flat layer 41 and a black matrix 42. The black matrix 42 is disposed on the second substrate 20 at both sides of the display unit, has light-impermeability, and forms a non-display region at both sides of the display unit. The planarization layer 41 is also disposed on the second substrate 20 between the black matrices 42, has light transmittance, and forms a display region in the middle of the display unit. In actual implementation, the flat layer 41 may not be provided, and the flat layer 41 is provided between the black matrices 42 in this embodiment, so that a flat transition in the region between the black matrices 42 can be ensured.
The isolation column 51 of the present embodiment is used as a defining structure between different display units, and is used as a supporting structure after two substrates are paired with each other, and the isolation column 51 separates adjacent display units and forms a closed space between the two substrates. The spacers 51 of all display cells together form an isolation matrix in a plane parallel to the display panel, the isolation matrix defining a plurality of display cells arranged in a matrix. In the plane perpendicular to the display panel, the cross section of the isolated columns 51 may be rectangular, trapezoidal, etc., and a closed space is formed between adjacent isolated columns 51, and the dispersion medium, the optical crystal particles 53 and the black particles 54 are disposed in the closed space to form a display unit. In this embodiment, the isolation pillars 51 may be made of an elastic polymer or the like by exposure and development. The magnetic layer 52 of the present embodiment is disposed on the sidewall of the isolation pillar 51 and is prepared by a coating method, and the magnetic layer 52 is used for adsorbing the photo-crystal particles 53 in an initial state, so that the photo-crystal particles 53 are gathered in a non-display region adjacent to the isolation pillar 51. The dispersion medium of this embodiment is in a liquid state, and is disposed in the closed space formed by the isolation column 51, the optical crystal particles 53 and the black particles 54 are suspended in the dispersion medium, the surface of the optical crystal particles 53 has a magnetic film, and the magnetic film of the optical crystal particles 53 is opposite to the magnetism of the magnetic layer on the side wall of the isolation column 51. In addition, the entirety of the photo crystal particles 53 exhibits electronegativity.
As shown in fig. 4, in the initial state, the photo crystal particles 53 with the magnetic film are attracted by the magnetic layer 52 on the sidewall of the spacer 51 and attracted to the vicinity of the magnetic layer 52, and the photo crystal particles 53 are not visible from the outside because the region where the photo crystal particles 53 are collected is the non-display region blocked by the black matrix 42. The photo crystal particles 53 are gathered in the non-display area, so that the black particles 54 with smaller diameter are extruded to the display area in the middle part and are dissociated in the display area, and because the black particles 54 have light-tight property, light cannot penetrate through the black particles, the light source is shielded, so that the display area displays a black state, and the initial black state display of the display panel is realized.
In the energized state, by changing the horizontal electric field formed by the first electrode 32 and the second electrode 33, the photo crystal particles 53 (the photo crystal particles 53 are entirely negatively charged) can be controlled to be detached from the magnetic layer 52 and move from the non-display region to the display region, and the movement of the photo crystal particles 53 causes the black particles 54 having a small diameter to be expelled to the peripheral non-display region. The non-display area where the black particles 54 are located is blocked by the black matrix 42, and thus the black particles 54 are not seen from the outside. By adjusting the electric field intensity, the arrangement pitch of the photonic crystal particles 53 in the display region can be controlled, and red, green, and blue display can be realized. The optical crystal particles can be seen as microspherical charged particles, under the drive of a horizontal electric field, the charged particles can move along the direction of the electric field, namely, the charged particles move directionally and are arranged in order, and because the optical crystal particles are microstructures of which the dielectric constants periodically change in the space according to the order of wavelength, the reflection of the optical crystal particles is mainly influenced by the distance among the optical crystal particles, and the optical crystal particles reflect light with the matched wavelength to obtain color display. Meanwhile, the display gray scale is influenced by the reflection intensity of the photonic crystal particles, and the larger the number of the photonic crystal particles is, the larger the reflection intensity of light is, so that the number of the photonic crystal particles can be controlled by controlling the size of the electric field, and further the transmittance of the display unit is controlled, so that the display unit displays the set color in the set gray scale. Fig. 5 is a diagram illustrating a photo-crystal according to the first embodiment of the present invention showing red, fig. 6 is a diagram illustrating a photo-crystal according to the first embodiment of the present invention showing green, and fig. 7 is a diagram illustrating a photo-crystal according to the first embodiment of the present invention showing blue. The electric field intensity of the horizontal electric field formed between the first electrode 32 and the second electrode 33 can be adjusted by adjusting the voltage inputted to the first electrode 32 through the thin film transistor, thereby driving the electro-optic crystal particles to move and to be arranged at a set pitch. As shown in fig. 5, the distance between the optical crystal particles is large, the optical crystal particles selectively reflect light in the wavelength range of 620nm to 770nm, and the display unit emits red light to show red color. As shown in fig. 6, the distance between the optical crystal particles is medium, the optical crystal particles selectively reflect light with a wavelength range of 490nm to 580nm, and the display unit emits green light to show green. As shown in fig. 7, the distance between the photo crystal particles is small, the photo crystal particles selectively reflect light with a wavelength range of 450nm to 490nm, and the display unit emits blue light to show blue color. Therefore, the arrangement distance of the optical crystal particles can be controlled by adjusting the electric field applied to the optical crystal particles through the display driving layer, the display of three primary colors of red, green and blue can be realized, the switching between a black state and a color can be realized, the electronic paper can be used as electronic paper, the full-color display of the electronic paper can be realized, and the problem that the existing electronic paper cannot realize the color display is solved. It should be noted that fig. 5 to 7 are merely exemplary illustrations regarding the distances between the photo-crystal particles, and in displaying a set color with a set gray scale, the non-display region may have a portion of the photo-crystal particles, and the display region may have a portion of the black particles.
Currently, Liquid Crystal Display (LCD) technology and Organic Light Emitting Diode (OLED) technology are mainly used in color Display devices. The liquid crystal display device consists of an array substrate, a color film substrate and a liquid crystal layer filled between the array substrate and the color film substrate, and the array substrate controls the deflection of liquid crystal so that white light passes through a color film layer on the color film substrate to form light with different colors. The organic light emitting diode display device consists of a circuit driving layer, a light emitting structure layer and a magnetic film, wherein the light emitting structure layer is excited to emit light by voltage transmitted by the circuit driving layer, so that the realization modes of displaying white light + color films, red, green and blue light emitting materials and the like in full color are realized. Due to the limitations of low luminous efficiency and short service life of blue light materials, the prior art mainly adopts a white light + color film mode to realize full-color display. According to the characteristics of the existing display, a color film layer is manufactured by adding a corresponding color film process in order to realize full-color display. Because 3 times of mask exposure process is needed for manufacturing the color film layer of the photoresist material, and corresponding photoresist materials are continuously developed to improve the color gamut and transmittance of the photoresist material, the existing preparation process for realizing full-color display has higher difficulty and higher preparation cost. According to the technical scheme for realizing color display, the arrangement distance of the optical crystal particles is controlled by adjusting the size of the electric field, so that the optical crystal particles reflect light rays with different wavelengths in white light, when a color display layer forms red, green and blue three-primary-color display, the color display layer can be used as a novel color film scheme of a display device to replace a color film layer adopting a light resistance material in the existing display device, and can also be used as a substitute scheme of a white light source and RBG, and the color display device is simple and convenient in preparation process, low in preparation cost, high in transmittance and good in application value.
The technical solution of this embodiment is further described below by the manufacturing process of the array substrate of this embodiment. The "patterning process" in this embodiment includes processes of depositing a film, coating a photoresist, exposing a mask, developing, etching, and stripping the photoresist, and is a well-established manufacturing process in the related art. The deposition may be performed by a known process such as sputtering, evaporation, chemical vapor deposition, etc., the coating may be performed by a known coating process, and the etching may be performed by a known method, which is not particularly limited herein. In the description of the present embodiment, it is to be understood that "thin film" refers to a layer of a material deposited or coated on a substrate. The "thin film" may also be referred to as a "layer" if it does not require a patterning process or a photolithography process throughout the fabrication process. If a patterning process or a photolithography process is required for the "thin film" in the entire manufacturing process, the "thin film" is referred to as a "thin film" before the patterning process, and the "layer" after the patterning process. The "layer" after the patterning process or the photolithography process includes at least one "pattern".
The manufacturing process of the display panel of the embodiment mainly comprises two parts, wherein the first part comprises a substrate and a color display layer, and the second part comprises two substrates which are aligned and pressed (box alignment). The preparation of the substrate comprises the preparation of a first substrate and the preparation of a second substrate, and the preparation of the first substrate and the preparation of the second substrate do not have the sequence requirement and can be carried out simultaneously. And the alignment and lamination are performed after the first substrate and the second substrate are prepared. The following describes the two parts of the process.
First, preparation of the first substrate in the first part
The first substrate of the present embodiment includes a first substrate 10 and a display driving layer 30 disposed on the first substrate 10, and a main structure of the display driving layer 30 includes a thin film transistor 31, a first electrode 32, and a second electrode 33. The process of forming the display driving layer 30 according to the present embodiment may employ a well-established process of fabricating an LCD or an OLED, which is substantially the same as a process of fabricating a driving circuit including a thin film transistor in an existing LCD or OLED. For example, the process of forming the display driving layer 30 may include:
(1) a first insulating film and an active film are sequentially deposited on the first substrate 10, and the active film is patterned through a patterning process to form a first insulating layer covering the first substrate 10 and an active layer pattern disposed on the first insulating layer. And then, depositing a second insulating film and a first metal film in sequence, and patterning the first metal film through a patterning process to form a second insulating layer covering the active layer pattern, and a gate line and a gate electrode pattern arranged on the second insulating layer, wherein the gate electrode is connected with the gate line. And then, taking the gate electrode as a mask, and carrying out ion implantation treatment on the active layer which is not shielded by the gate electrode, so that doped regions are formed on two sides of the active layer. And then depositing a third insulating film, and patterning the third insulating film through a patterning process to form a third insulating layer pattern covering the gate line and the gate electrode, wherein the third insulating layer is provided with 2 first via holes, and the 2 first via holes are respectively exposed out of the doped regions at two sides of the active layer. And then, depositing a second metal film, patterning the second metal film through a patterning process to form a data line, a source electrode and a drain electrode which are arranged on the third insulating layer, wherein the source electrode and the drain electrode are respectively connected with the doping area of the active layer through 2 first through holes, and a conductive channel is formed between the source electrode and the drain electrode. The active layer, the gate electrode, the source electrode, and the drain electrode constitute a Thin Film Transistor (TFT) 31. And depositing a fourth insulating film, and patterning the fourth insulating film by a patterning process to form a fourth insulating layer pattern covering the data line, the source electrode and the drain electrode, wherein a second through hole is formed in the fourth insulating layer and exposes the drain electrode. Subsequently, a transparent conductive film is deposited and patterned through a patterning process to form a first electrode 32 and a second electrode 33 disposed on the fourth insulating layer, and the first electrode 32 is connected to the drain electrode of the thin film transistor 31 through the second via hole, as shown in fig. 8.
The first substrate may be a transparent glass substrate, a quartz substrate, a plastic substrate, or a flexible substrate. The active thin film can be made of various materials such as amorphous indium gallium zinc Oxide material a-IGZO, zinc oxynitride ZnON, indium zinc tin Oxide IZTO, amorphous silicon a-Si, polycrystalline silicon p-Si, hexathiophene, polythiophene and the like, that is, the embodiment is simultaneously suitable for thin film transistors manufactured based on Oxide technology, silicon technology and organic matter technology. Preferably, the active thin film of this embodiment is an amorphous Silicon thin film, and the amorphous Silicon thin film is processed by a laser method, so that the amorphous Silicon thin film is crystallized into a polysilicon thin film, so as to form a Low Temperature Polysilicon (LTPS) thin film transistor. The LTPS thin film transistor has various advantages, and the electron mobility of the LTPS thin film transistor can reach 200cm2More than V-sec, not only can effectively reduce the area of the thin film transistor and improve the aperture ratio, but also can improve the display brightness and simultaneously reduce the whole power consumption. The first metal film and the second metal film may be made of metal materials, such as silver Ag, copper Cu, aluminum Al, molybdenum Mo, and the like, or alloy materials of the above metals, and may be of a single-layer structure or a multi-layer composite structure, and deposited by a magnetron sputtering method (Sputter). The first insulating film, the second insulating film, the third insulating film, and the fourth insulating film may be formed of silicon oxide SiOx, silicon nitride SiNx, silicon oxynitride SiON, or the like, or may be formed of aluminum oxide AlOx, hafnium oxide HfOx, tantalum oxide TaOx, or the like, and may be formed of a single layer, a multilayer, or a composite layer, and may be formed by Chemical Vapor Deposition (CVD) or Plasma Enhanced Chemical Vapor Deposition (PECVD). Generally, the first insulating layer is called Buffer (Buffer)The transparent conductive film may be formed of indium tin oxide ITO, indium zinc oxide IZO, or amorphous indium tin oxide α -ITO, etc., which may be single-layered, multi-layered, or composite-layered, deposited by a magnetron sputtering method (Sputter).
(2) Forming an isolation matrix pattern, specifically, coating an elastic polymer film on a first substrate on which the pattern is formed, exposing and developing through a mask, forming a plurality of isolation columns 51 patterns arranged at intervals on the display driving layer, wherein the isolation columns 51 isolate a plurality of display units arranged in a matrix, and the isolation columns 51 of all the display units form the isolation matrix pattern. Subsequently, on the first substrate on which the foregoing pattern is formed, a magnetic thin film is coated, and then exposed and developed through a mask, a pattern of a magnetic layer 52 is formed on the sidewall of the spacer 51, and the magnetic layer 52 covers the surface of the spacer 51 facing the inside, as shown in fig. 9. Thus, the first substrate is completed.
Second, preparation of the second substrate in the first part
The second substrate of this embodiment includes a second base 20 and a display defining layer 40 disposed on the second base 20, and the display defining layer 40 includes a flat layer 41 and a black matrix 42. The process of forming the display defining layer 40 may be a mature process of manufacturing an existing LCD, and the manufacturing process is substantially the same as the process of manufacturing a color film substrate in the existing LCD. For example, the process of forming the display definition layer 40 may include:
a black matrix 42 pattern is formed on the second substrate 20 by coating a blocking film on the second substrate 20, and then exposing and developing through a mask. Subsequently, on the second substrate on which the aforementioned pattern is formed, a flat film is coated, and then exposed and developed through a mask, and a flat layer 41 pattern is formed on the second substrate 20, as shown in fig. 10. Wherein the flat layer 41 is located between the black matrixes 42, and the thickness of the flat layer 41 and the thickness of the black matrixes 42 are the same relative to the surface of the second substrate 20, i.e. the flat layer 41 and the black matrixes 42 have flat surfaces. The shading film can be made of Black Matrix (BM) material, such as carbon black or black pigment, and has opacity, and the flat film is made of transparent resin material, such as photoresist. Thus, the preparation of the second substrate is completed.
Three, counterpoint pressfitting treatment
After the first substrate and the second substrate are prepared, firstly, a color display solution is dripped into a closed space surrounded by the first substrate isolation columns, and the color display solution comprises a liquid dispersion medium, and optical crystal particles and black particles suspended in the dispersion medium. Then, the edge of the first substrate is coated with the sealant, and the end of the isolation pillar 51 of the first substrate is coated with the sealant. And then, the second substrate is turned over, the display definition layer of the second substrate faces the first substrate, the first substrate and the second substrate are relatively close to each other to be aligned and laminated, the frame sealing glue and the sealing glue are cured through ultraviolet irradiation and/or heating treatment, and the first substrate and the second substrate are fixedly connected together to finish the preparation of the display panel.
It should be noted that the above preparation process is only an exemplary one. In practical implementation, the color display solution may be dispensed during the preparation of the first substrate, the spacer columns may also be disposed on the second substrate, and the frame sealing adhesive may also be disposed on the second substrate, and the preparation sequence may be adjusted according to actual needs, and is not specifically limited herein.
It can be seen through this embodiment display panel's structure and preparation process that this embodiment is through setting up the colored display layer including brilliant particle and black particle, adopts the display drive layer to exert the range of electric field control brilliant particle and realize red, green, blue and black state and show, simple structure, easily preparation has not only realized colored display, can realize black state and colored switching moreover, has effectively solved the problem that current electronic paper can not realize colored display. Compared with the existing black-and-white display electronic paper, the embodiment can realize color display of different gray scales, greatly improves the application range of the electronic paper technology, and is beneficial to popularization of the electronic paper technology. Furthermore, the display panel prepared by the embodiment does not need to adopt a new process and introduce new materials, does not need to change the existing process equipment, and has the advantages of good process compatibility, high process realizability, low preparation process difficulty, low preparation cost and good application prospect.
Fig. 11 is a schematic structural diagram of a display panel according to a second embodiment of the present invention, which is an extension of the display panel according to the first embodiment. The main structure of the display panel of the present embodiment is substantially the same as that of the first embodiment, and includes a first substrate 10 and a second substrate 20, a display driving layer 30 disposed on a surface of the first substrate 10 facing the second substrate 20, a display defining layer 40 disposed on a surface of the second substrate 20 facing the first substrate 10, and a color display layer 50 disposed between the display driving layer 30 and the display defining layer 40. As shown in fig. 11, unlike the foregoing first embodiment, the display driving layer 30 of the present embodiment includes a thin film transistor 31 and a first electrode 32, the display defining layer 40 includes a flat layer 41 and a black matrix 42, and a second electrode 33 provided on the flat layer 41 and the black matrix 42, and the color display layer 50 is used to display a black state or to display a set color in a set gray scale under the control of the display driving layer 30 and the display defining layer 40. That is, the present embodiment disposes the second electrode 33 on the second substrate 20 side, and a vertical electric field is formed between the first electrode 32 and the second electrode 33.
In this embodiment, the second electrode 33 is a planar electrode and is connected to a common electrode line. In the display definition layer 40, the second electrode 33 may be disposed on the second substrate 20, and the planarization layer 41 and the black matrix 42 may be disposed on the second electrode 33, or the planarization layer 41 and the black matrix 42 may be disposed on the second substrate 20, and the second electrode 33 may be disposed on the planarization layer 41 and the black matrix 42. In this embodiment, the structures of the thin film transistor 31 and the first electrode 32 in the display driving layer 30 and the structure of the color display layer are the same as those in the first embodiment, and are not described again here. The manufacturing process of the display panel of this embodiment is substantially the same as that of the first embodiment, except that the second electrode is not formed when the first substrate is manufactured, and the flow of forming the second electrode is added when the second substrate is manufactured.
As shown in fig. 11, in the initial state, the photo crystal particles 53 with the magnetic film are attracted by the magnetic layer 52 on the sidewall of the spacer 51 and attracted to the vicinity of the magnetic layer 52, and the photo crystal particles 53 are not visible from the outside because the region where the photo crystal particles 53 are collected is the non-display region blocked by the black matrix 42. The photo crystal particles 53 are gathered in the non-display area, so that the black particles 54 with smaller diameter are squeezed to the display area in the middle, and because the black particles 54 have opacity, light cannot penetrate through, so that the display area displays a black state, and the initial black state display of the display panel is realized.
In the energized state, by changing the vertical electric field formed by the first electrode 32 and the second electrode 33, the photonic crystal particles 53 (the whole photonic crystal particles 53 exhibit electronegativity) can be controlled to be detached from the magnetic layer 52 and move from the non-display region to the display region, and the movement of the photonic crystal particles 53 causes the black particles 54 having a small diameter to be expelled to the peripheral non-display region. The non-display area where the black particles 54 are located is blocked by the black matrix 42, and thus the black particles 54 are not seen from the outside. By adjusting the electric field intensity, the arrangement pitch of the photonic crystal particles 53 in the display region can be controlled, and red, green, and blue display can be realized. Fig. 12 is a diagram of a photo-crystal device showing red, green and blue colors according to a second embodiment of the present invention. The arrangement distance of the optical crystal particles and the distance between the optical crystal particles are further controlled by adjusting the vertical electric field form and the electric field intensity between the first electrode 32 and the second electrode 33. As shown in fig. 12, when the distance between the photo dies is controlled to be larger, the display unit emits red light to show red color. When the spacing between the optical crystal particles is controlled to be equal, the display unit emits green light and presents green. When the distance between the photo crystal particles is controlled to be smaller, the display unit emits blue light and presents blue. Thus, the arrangement distance of the optical crystal particles can be controlled by adjusting the electric field applied to the optical crystal particles through the display driving layer, and not only can the display of three primary colors of red, green and blue be realized, but also the switching between the black state and the color can be realized.
The embodiment also achieves the technical effects of the first embodiment, not only achieves color display, but also achieves switching between black and color, and effectively solves the problem that the existing electronic paper cannot achieve color display.
Based on the technical concept of the foregoing embodiment, the embodiment of the invention also provides a preparation method of the display panel. The preparation method of the display panel comprises the following steps:
preparing a first substrate including a color display layer, and preparing a second substrate; the color display layer comprises a dispersion medium, and optical crystal particles and black particles suspended in the dispersion medium, and is used for displaying a black state or displaying a set color in a set gray scale; (ii) a
And aligning and pressing the first substrate and the second substrate.
Wherein preparing a first substrate including a color display layer includes:
forming a display driving layer on a first substrate;
forming a plurality of isolation columns for isolating a plurality of display units on the display driving layer;
forming a magnetic layer on the side wall of the isolation column;
and dripping a color display solution in a closed space surrounded by the isolation columns, wherein the color display solution comprises a dispersion medium, and optical crystal particles and black particles suspended in the dispersion medium.
Wherein preparing the second substrate comprises: a display definition layer is formed on the second substrate.
The display driving layer comprises a first electrode and a second electrode, and the display definition layer comprises a black matrix; or, the display driving layer comprises a first electrode, and the display defining layer comprises a second electrode and a black matrix.
Wherein the display definition layer further comprises a planarization layer disposed between the black matrices.
Wherein the photonic crystal particles comprise photonic crystal particles and magnetic films wrapping the photonic crystal particles.
The diameter of the photonic crystal particles is 1-3 mu m, the thickness of the magnetic film is 20-50 nm, and the diameter of the black particles is 1-10 nm.
The photonic crystal particles comprise polystyrene microspheres and titanium dioxide wrapping the polystyrene microspheres; the material of the magnetic film comprises ferroferric oxide or RFe2The alloy R is Tb, Dy, Tb, or Dy,One or more of samarium Sm.
The specific process of manufacturing the display panel has been described in detail in the foregoing embodiments, and is not described herein again.
The embodiment of the invention provides a preparation method of a display panel, which is characterized in that a color display layer comprising optical crystal particles and black particles is arranged, and the arrangement distance of the optical crystal particles is controlled, so that not only is color display realized, but also black state and color switching is realized, and the problem that the existing electronic paper cannot realize color display is effectively solved. Furthermore, the preparation method provided by the embodiment of the invention does not need to adopt a new process, introduce new materials or change the existing process equipment, and has the advantages of good process compatibility, high process realizability, low preparation process difficulty, low preparation cost and good application prospect.
The embodiment of the invention also provides a display device which comprises the display panel of the embodiment. The display device may be: any product or component with a display function, such as electronic paper, an electronic label, an electronic sign, an electronic billboard, and the like.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (15)
1. The display panel is characterized by comprising a first substrate and a second substrate which are oppositely arranged, and a color display layer arranged between the first substrate and the second substrate, wherein the color display layer comprises a dispersion medium, and optical crystal particles and black particles suspended in the dispersion medium, and the color display layer is used for displaying a black state or displaying a set color in a set gray scale.
2. The display panel according to claim 2, wherein the photonic crystal particles comprise photonic crystal particles and a magnetic film wrapping the photonic crystal particles.
3. The display panel according to claim 2, wherein the photonic crystal particles have a diameter of 1 μm to 3 μm, the magnetic film has a thickness of 20nm to 50nm, and the black particles have a diameter of 1nm to 10 nm.
4. The display panel according to claim 2, wherein the photonic crystal particles comprise polystyrene microspheres and titanium dioxide wrapping the polystyrene microspheres; the material of the magnetic film comprises ferroferric oxide Fe3O4Or RFe2And R is one or more of terbium Tb, dysprosium Dy and samarium Sm.
5. The display panel according to any one of claims 1 to 4, wherein the first substrate comprises a first base and a display driving layer disposed on a side of the first base facing the second substrate; the second substrate comprises a second base and a display definition layer arranged on one side of the second base facing the first substrate; the color display layer is arranged between the display driving layer and the display definition layer, the color display layer further comprises a plurality of isolation columns for isolating a plurality of display units and a magnetic layer arranged on the side walls of the isolation columns, and the magnetic layer is used for adsorbing the optical crystal particles in an initial state.
6. The display panel according to claim 5, wherein the display driving layer includes a first electrode and a second electrode, and the display definition layer includes a black matrix for shielding the adsorbed photonic crystal particles, within the display unit; or, in the display unit, the display driving layer includes a first electrode, and the display defining layer includes a second electrode and a black matrix for shielding the adsorbed photonic crystal particles.
7. The display panel according to claim 6, wherein the black matrix forms a non-display region of the display unit, and a region other than the black matrix forms a display region of the display unit; the first electrode and the second electrode are used for forming an electric field, and the electric field drives the optical crystal particles to move from the non-display area to the display area and to be arranged in the display area at a set interval, so that the display area displays a set color at a set gray scale.
8. The display panel according to claim 7, wherein the set color comprises red, green or blue.
9. The display panel according to claim 5, wherein the display definition layer further comprises a planarization layer, and the planarization layer is disposed between the black matrices.
10. A display device comprising the display panel according to any one of claims 1 to 9.
11. A method for manufacturing a display panel, comprising:
preparing a first substrate including a color display layer, and preparing a second substrate; the color display layer comprises a dispersion medium, and optical crystal particles and black particles suspended in the dispersion medium, and is used for displaying a black state or displaying a set color in a set gray scale;
and aligning and pressing the first substrate and the second substrate.
12. The method of claim 11, wherein preparing the first substrate including the color display layer comprises:
forming a display driving layer on a first substrate;
forming a plurality of isolation columns for isolating a plurality of display units on the display driving layer;
forming a magnetic layer on the side wall of the isolation column;
and dripping a color display solution in a space surrounded by the isolation columns, wherein the color display solution comprises a dispersion medium, and optical crystal particles and black particles suspended in the dispersion medium.
13. The production method according to claim 11 or 12, wherein the photonic crystal particles include photonic crystal particles and a magnetic film wrapping the photonic crystal particles.
14. The method of claim 13, wherein the photonic crystal particles have a diameter of 1 μm to 3 μm, the magnetic film has a thickness of 20nm to 50nm, and the black particles have a diameter of 1nm to 10 nm.
15. The method of claim 13, wherein the photonic crystal particles comprise polystyrene microspheres and titanium dioxide coating the polystyrene microspheres; the material of the magnetic film comprises ferroferric oxide or RFe2And R is one or more of terbium Tb, dysprosium Dy and samarium Sm.
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