WO2020253329A1

WO2020253329A1 - Display panel and display device

Info

Publication number: WO2020253329A1
Application number: PCT/CN2020/083351
Authority: WO
Inventors: 闫光; 吴长晏; 尤娟娟; 林奕呈; 王玲; 杨栋芳
Original assignee: 京东方科技集团股份有限公司
Priority date: 2019-06-18
Filing date: 2020-04-03
Publication date: 2020-12-24
Also published as: CN110224012B; CN110224012A

Abstract

Provided are a display panel and a display device. The display panel comprises: a substrate; an ultraviolet light emitting device, the ultraviolet light emitting device being disposed on one side of the substrate; a first photonic crystal layer, the first photonic crystal layer being provided on the side of the ultraviolet light emitting device away from the substrate and being configured to transmit ultraviolet light and reflect visible light; a plurality of color conversion layers, the plurality of color conversion layers being provided at intervals on the side of the first photonic crystal layer away from the substrate and being configured to convert ultraviolet light into visible light of different colors; and a second photonic crystal layer, the second photonic crystal layer being provided on the side of the color conversion layers away from the substrate and being configured to transmit visible light and reflect ultraviolet light.

Description

Display panel and display device

Cross references to related applications

This application claims the priority of Chinese Patent Application No. 201910527185.4 filed on June 18, 2019, and the full text is incorporated herein by reference.

Technical field

The present disclosure relates to the field of display technology, and in particular, to a display panel and a display device.

Background technique

OLED is an active light emitting display device, so it has unparalleled ultra-high contrast and ultra-fast response speed. The small-size OLED products prepared by the fine metal mask method use the modulation effect of the optical resonator to facilitate low power consumption and high color gamut, but this method cannot achieve stable mass production of large-size OLED products. Therefore, the large-size OLED products currently mass-produced all adopt the method of white light OLED plus color filter, which makes the power consumption and color gamut have great deficiencies. The use of blue OLED plus green and red quantum dot color conversion layer can improve the above problems, but blue OLED must adopt a structure with a strong optical resonator (reflective electrode on one side and transflective with high reflectivity on one side) Electrode) in order to improve the emission intensity and color purity of blue light, and the above-mentioned strong optical modulation effect makes the viewing angle characteristics very poor, and the problem of visual role deviation is more serious.

Therefore, current OLED display devices still need to be improved.

Summary of the invention

The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an objective of some aspects or embodiments of the present disclosure is to provide a display panel with low power consumption, high color gamut, or good viewing angle characteristics.

In one aspect of the present disclosure, the present disclosure provides a display panel. According to an embodiment of the present disclosure, the display panel includes: a substrate; an ultraviolet light emitting structure, the ultraviolet light emitting structure is arranged on one side of the substrate; a first photonic crystal layer, the first photonic crystal layer is arranged on the ultraviolet The light-emitting structure is on the side far away from the substrate for transmitting ultraviolet light and reflecting visible light; a plurality of color conversion layers, the plurality of color conversion layers are arranged at intervals on the side of the first photonic crystal layer away from the substrate, The second photonic crystal layer is used to convert ultraviolet light into visible light of different colors; the second photonic crystal layer is arranged on the side of the color conversion layer away from the substrate, and is used to transmit visible light and reflect ultraviolet light.

In some embodiments, the plurality of color conversion layers are arranged at intervals on the surface of the first photonic crystal layer away from the substrate.

According to an embodiment of the present disclosure, the center wavelength of the emission spectrum of the ultraviolet light-emitting structure is 380-430 nm.

According to an embodiment of the present disclosure, the ultraviolet light emitting structure includes: a plurality of first electrodes, the plurality of first electrodes are arranged at intervals on one side of the substrate, and the orthographic projection of each color conversion layer on the substrate Cover an orthographic projection of the first electrode on the substrate; an ultraviolet light-emitting layer, the ultraviolet light-emitting layer is arranged on the side of the first electrode away from the substrate; a second electrode, the second electrode is arranged On the side of the ultraviolet light-emitting layer away from the substrate.

According to an embodiment of the present disclosure, one of the first electrode and the second electrode is a reflective electrode, and the other of the first electrode and the second electrode is a transflective electrode.

According to an embodiment of the present disclosure, the transmittance of the first photonic crystal layer to ultraviolet light is greater than or equal to 80%, and the reflectivity to visible light is greater than or equal to 85%; the reflectivity of the second photonic crystal layer to ultraviolet light is greater than Equal to 85%, and the transmittance of visible light is greater than or equal to 80%.

According to an embodiment of the present disclosure, the transmittance of the first photonic crystal layer to ultraviolet light is greater than or equal to 90%, and the reflectance of visible light is greater than or equal to 95%; the reflectivity of the second photonic crystal layer to ultraviolet light is greater than Equal to 95%, and the transmittance of visible light is greater than or equal to 90%.

According to an embodiment of the present disclosure, the first photonic crystal layer and the second photonic crystal layer are two-dimensional photonic crystals.

According to an embodiment of the present disclosure, the first photonic crystal layer and the second photonic crystal layer each independently include a plurality of alternately stacked inorganic layers and organic layers, and satisfy at least one of the following conditions: the organic The refractive index of the layer and the inorganic layer are independently 1.3 to 2.4; the material of the inorganic layer includes at least one of SiNx, SiO ₂ , SiC, Al ₂ O ₃ , ZnS, and ZnO; Materials include polyvinylpyrrolidone, polyvinyl alcohol, 8-hydroxyquinoline aluminum, N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4' -At least one of diamine and HAT-CN. In some embodiments, the refractive index of the organic layer is different from the refractive index of the inorganic layer.

According to an embodiment of the present disclosure, the material of the color conversion layer includes quantum dots or quantum rods.

According to an embodiment of the present disclosure, the display panel further includes at least one of a first protective layer, a second protective layer, a planarization layer, and a color filter layer, wherein the first protective layer is disposed on the first protective layer. The photonic crystal layer is close to the surface of the substrate, the second protective layer is disposed on the surface of the second photonic crystal layer close to the substrate, and the planarization layer is disposed on the color conversion layer away from the substrate And cover the color conversion layer, and the color filter layer is disposed on the side of the second photonic crystal layer away from the substrate.

In the display panel, the ultraviolet light-emitting structure can emit ultraviolet light, and the ultraviolet light passes through the first photonic crystal layer, the color conversion layer and the second photonic crystal layer in sequence, and is converted into visible light of different colors for displaying images. According to the embodiments of the present disclosure, one or more of the following can be achieved: high ultraviolet light conversion efficiency, high light utilization rate, high visible light emission intensity, not only high color gamut and low energy consumption, but also converted different colors The visible light conforms to the Lambertian distribution, the viewing angle is uniform, and the display quality is high.

In another aspect of the present disclosure, the present disclosure provides a method of manufacturing the aforementioned display panel. According to an embodiment of the present disclosure, the method includes: forming an ultraviolet light emitting structure on one side of a substrate; forming a first photonic crystal layer on a side of the ultraviolet light emitting structure away from the substrate; and forming a first photonic crystal layer away from the first photonic crystal layer. A plurality of color conversion layers are formed on the surface of the substrate, and a second photonic crystal layer is formed on the side of the color conversion layer away from the substrate.

According to an embodiment of the present disclosure, the method further includes at least one of forming a first protective layer, forming a second protective layer, forming a planarization layer, and forming a color filter layer.

Through this method, the aforementioned display panel can be prepared quickly and conveniently, and the steps are simple, the operation is easy, there are no harsh requirements on technical personnel and equipment, and industrial production is easy to realize.

In another aspect of the present disclosure, the present disclosure provides a display device. According to an embodiment of the present disclosure, the display device includes the display panel according to any aspect or embodiment of the present disclosure.

The display device has a high color gamut, low energy consumption, and good viewing angle uniformity, does not have problems such as visual role deviation, and has high display quality.

Description of the drawings

FIG. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure.

FIG. 2 is a schematic structural diagram of a display panel according to another embodiment of the present disclosure.

3 is a schematic diagram of the emission spectrum, the transmission spectrum and the reflection spectrum of the first photonic crystal layer and the second photonic crystal layer of an ultraviolet light emitting device according to an embodiment of the present disclosure.

FIG. 4 is a schematic structural diagram of a display panel according to another embodiment of the present disclosure.

FIG. 5 is a schematic structural diagram of a display panel according to another embodiment of the present disclosure.

FIG. 6 is a schematic structural diagram of a display panel according to another embodiment of the present disclosure.

FIG. 7 is a schematic structural diagram of a display panel according to another embodiment of the present disclosure.

Detailed ways

The embodiments of the present disclosure are described in detail below. The embodiments described below are exemplary, and are only used to explain the present disclosure, but should not be construed as limiting the present disclosure. Where specific techniques or conditions are not indicated in the examples, the procedures shall be carried out in accordance with the techniques or conditions described in the literature in the field or in accordance with the product specification. The reagents or instruments used without the manufacturer's indication are all conventional products that are commercially available.

In one aspect of the present disclosure, the present disclosure provides a display panel. According to an embodiment of the present disclosure, referring to FIG. 1, the display panel includes: a substrate 10; an ultraviolet light emitting device 20, the ultraviolet light emitting device 20 is disposed on one side of the substrate 10; a first photonic crystal layer 30, the second A photonic crystal layer 30 is arranged on the side of the ultraviolet light-emitting device 20 away from the substrate 10 for transmitting ultraviolet light and reflecting visible light; a plurality of color conversion layers 40, and a plurality of the color conversion layers 40 are arranged at intervals The first photonic crystal layer 30 is on the surface away from the substrate 10 and is used to convert ultraviolet light into visible light of different colors; the second photonic crystal layer 50 is disposed on the color conversion layer The side 40 away from the substrate 10 is used to transmit visible light and reflect ultraviolet light. In the display panel, the ultraviolet light-emitting device can emit ultraviolet light, and the first photonic crystal layer can allow the above-mentioned ultraviolet light to pass through and reach the color conversion layer with a higher transmittance, and can reflect stray visible light in the opposite direction. Under the action of the color conversion layer, the ultraviolet light is converted into visible light of different colors and irradiated to the second photonic crystal layer. The second photonic crystal layer can reflect the unconverted ultraviolet light to the color conversion layer for secondary use. The high transmittance allows the converted visible light to be transmitted, and the transmitted visible light can be effectively displayed. The light utilization rate is high, the visible light emission intensity is large, not only the color gamut is high, the energy consumption is low, but also the converted visible light of different colors It conforms to Lambertian distribution, has good viewing angle uniformity and high display quality.

It should be noted that in this article, the Lambertian distribution refers to the uniform reflection of incident energy in all directions, that is, the incident energy is centered at the incident point, and the phenomenon of isotropic reflection energy to the surroundings in the entire hemispherical space is called diffuse reflection. Also called isotropic reflection; or a phenomenon in which the light source centers on itself and emits energy isotropically to the surroundings in the entire hemispherical space.

According to the embodiments of the present disclosure, the specific structure of the substrate is not particularly limited, and those skilled in the art can flexibly choose according to actual needs. In some specific embodiments, the substrate may include a substrate and a circuit structure provided on the substrate (such as thin film transistors). Etc.), the substrate can be a glass substrate, a polymer substrate, etc., and the circuit structure can be set according to actual needs, which will not be repeated here.

According to the embodiments of the present disclosure, the structure of the ultraviolet light emitting device is not particularly limited, as long as it can effectively emit ultraviolet light of different brightness, and display can be realized after conversion. In some specific embodiments, referring to FIG. 2, the ultraviolet light emitting device 20 may include a plurality of first electrodes 21, an ultraviolet light emitting layer 22, and a second electrode 23, wherein the plurality of first electrodes 21 are provided on the surface of the substrate 10, each The orthographic projection of a color conversion layer 40 on the substrate 10 covers an orthographic projection of the first electrode 21 on the substrate 10; the ultraviolet light-emitting layer 22 is arranged on the side of the first electrode 21 away from the substrate 10, The two electrodes 23 are arranged on the surface of the ultraviolet light-emitting layer 22 away from the substrate 10. Therefore, different voltages can be applied to the light-emitting layer through the plurality of first electrodes 21, so that the ultraviolet light-emitting layer emits ultraviolet light of different brightness, and then converted to obtain visible light of different brightness that meets the display requirements, and effectively realizes the display function.

According to some specific embodiments of the present disclosure, one of the first electrode and the second electrode is a reflective electrode, and the other of the first electrode and the second electrode is a semi-transmissive and semi-reverse electrode. Therefore, the ultraviolet light-emitting device can have a strong resonant cavity effect, thereby obtaining better color purity and higher light extraction efficiency, and the visible light emission after passing through the color conversion layer belongs to photoluminescence, isotropic, conforming to Lambertian Distribution, will not adversely affect the viewing angle characteristics.

According to some specific embodiments of the present disclosure, the above-mentioned reflective electrode includes at least a metal layer (such as Ag, Al, silver alloy, aluminum alloy, etc.) of total reflection (reflectivity ≥90%), and may further include a transparent conductive metal oxide ( Such as ITO, etc.) layer; the above-mentioned transmissive electrode can be a metal (e.g. Ag, Mg, magnesium-silver alloy, etc.), and its thickness can be 8-20nm (e.g. 8nm, 9nm, 10nm, 11nm, 12nm, 13nm, 14nm, 15nm) , 16nm, 17nm, 18nm, 19nm, 20nm, etc.). According to other specific embodiments of the present disclosure, the above-mentioned ultraviolet light-emitting device may further include a carrier transport layer, such as an electron injection layer, an electron transport layer, a hole injection layer, a hole transport layer, etc., which may be specifically arranged on the first electrode And the ultraviolet light-emitting layer or between the second electrode and the ultraviolet light-emitting layer, thereby improving the luminous efficiency and display effect.

According to some specific embodiments of the present disclosure, the ultraviolet light emitting device includes a first electrode/MoO ₃ (thickness 5-8nm)/TAPC (4,4'-cyclohexylbis[N,N-bis(4-methyl Phenyl) aniline], thickness 20-30nm, as a hole transport layer)/CBP (4,4-bis(9-carbazole)biphenyl, thickness 25-30nm, as ultraviolet light-emitting layer)/Bphen(4,7 -Diphenyl-1,10-phenanthroline, thickness 25～35nm, as electron transport layer)/LiQ (8-hydroxyquinoline-lithium, thickness 1nm, as electron injection layer)/second electrode, of which, One electrode includes laminated Al/Pd/ITO with an optional thickness of 1-2nm (ie Al/Pd or Al/Pd/ITO with a thickness of 1-2nm), and the second electrode is a metal electrode, which can be a simple metal or The alloy is specifically a magnesium-silver alloy (Mg:Ag=9:1) with a thickness of 15 nm.

According to an embodiment of the present disclosure, the center wavelength of the emission spectrum of the ultraviolet light-emitting device is 380-430 nm (specifically, 380 nm, 390 nm, 400 nm, 410 nm, 420 nm, 430 nm, etc.). As a result, it is beneficial to increase the emission intensity of ultraviolet light and increase the light conversion efficiency, and reduce the energy consumption of the display panel.

According to an embodiment of the present disclosure, a photonic crystal refers to an artificial periodic dielectric structure with Photonic Band-Gap (PBG) characteristics, and is sometimes referred to as a PBG photonic crystal structure. This structure is a periodic structure that can control the propagation of electromagnetic waves. Using PBG/EBG (EBG is the abbreviation of Electromagnetic Band Gap, that is, electromagnetic field band gap) can realize the penetration or reflection of certain specific wavelengths.

According to an embodiment of the present disclosure, the transmittance of the first photonic crystal layer to ultraviolet light is greater than or equal to 80% (specifically, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%). %, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, etc.), the reflectance of visible light is greater than or equal to 85% (specifically, 85 %, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, etc.); the second photonic crystal layer The reflectance of ultraviolet light is greater than or equal to 85% (specifically, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97 %, 98%, etc.), the transmittance of visible light is greater than or equal to 80% (specifically 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, etc.). As a result, the ultraviolet light emitted by the ultraviolet light-emitting device can pass through the first photonic crystal layer with high efficiency, improve the utilization rate of light, and can reflect other stray light to avoid affecting the display effect, and the second photonic crystal layer can make the ultraviolet The light is reused after reflection, the light utilization rate is high, and the converted visible light can be emitted efficiently to ensure a good display effect. In some specific embodiments, the emission spectra of the ultraviolet light emitting device (UV-OLED), the transmission and reflection spectra of the first photonic crystal layer (PBG1) and the second photonic crystal layer (PBG2) can refer to FIG. 3.

In some embodiments, an ultraviolet absorbing layer may be added to absorb undesired ultraviolet light, for example, to absorb ultraviolet light passing through the second photonic crystal layer and to transmit visible light.

According to some specific embodiments of the present disclosure, the transmittance of the first photonic crystal layer to ultraviolet light is greater than or equal to 90%, and the reflectivity of visible light is greater than or equal to 95%; the second photonic crystal layer reflects ultraviolet light The rate is greater than or equal to 95%, and the transmittance of visible light is greater than or equal to 90%. Therefore, the light utilization efficiency of the display panel is higher, and the display effect is better.

According to an embodiment of the present disclosure, the first photonic crystal layer and the second photonic crystal layer are two-dimensional photonic crystals. Specifically, a two-dimensional photonic crystal refers to a photonic crystal in which dielectric materials with different dielectric constants are arranged periodically in a two-dimensional space. According to some specific embodiments of the present disclosure, the first photonic crystal layer and the second photonic crystal layer each independently include a plurality of alternately stacked inorganic layers and organic layers, and meet at least one of the following conditions: The refractive index of the organic layer and the inorganic layer are independently 1.3 to 2.4 (specifically, such as 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, etc.); The material of the layer includes at least one of SiNx (ie silicon nitride), SiO ₂ , SiC, Al ₂ O ₃ , ZnS and ZnO; the material of the organic layer includes polyvinylpyrrolidone, polyvinyl alcohol, 8-hydroxyquine At least one of morpholino aluminum, N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine, and HAT-CN.

Therefore, through the above-mentioned inorganic layer and organic layer with different dielectric constants stacked, by adjusting the refractive index, dielectric constant, thickness, etc., the transmission and reflection effects of light of different wavelengths can be realized, and the inorganic layer and the organic layer It has a good effect of blocking water and oxygen, and also improves the reliability of the display panel; and the number, material, thickness and refractive index of the specific organic and inorganic layers can be based on the actual required reflection or transmission wavelength and reflectivity And the transmittance can be adjusted flexibly, so I won’t repeat it here.

In some embodiments, the refractive index of the organic layer is set to be different from the refractive index of the inorganic layer. For example, the refractive index of the organic layer may be set to 1.3, and the refractive index of the inorganic layer may be set to 1.7. Alternatively, the refractive index of the organic layer may be set to 1.7, and the refractive index of the inorganic layer may be set to 1.3.

In some specific embodiments, the first photonic crystal layer may include alternately arranged silicon nitride layers and silicon carbide layers. The specific structure and film thickness may be: SiNx (0.7 microns)/SiC (1.0 microns)/SiNx (0.7 microns) )/SiC (1.0 microns)/SiNx (1.0 microns); the second photonic crystal layer may also include alternately arranged silicon nitride layers and silicon carbide layers, the specific structure and film thickness may be: SiNx (0.6 microns)/SiC (1.0 microns)/SiNx (0.6 microns)/SiC (1.0 microns)/SiNx (1.0 microns). Therefore, the transmittance of the first photonic crystal layer to ultraviolet light is greater than or equal to 90%, and the reflectivity of visible light is greater than or equal to 95%, and the reflectivity of the second photonic crystal layer to ultraviolet light is greater than or equal to 95%, which is greater than or equal to 95% of visible light. The transmittance is greater than or equal to 90%.

Those skilled in the art can understand that in order to realize the display function, the color conversion layer may include multiple color conversion layers of different colors arranged according to a certain rule, for example, may include three color conversion layers of red, green, and blue. The distribution method may include, but is not limited to, the color conversion layers of each color are distributed in rows or columns, and the color conversion layers in rows or columns may be periodically arranged in the order of red, green, and blue.

According to an embodiment of the present disclosure, the material of the color conversion layer may include quantum dots or quantum rods. Specifically, a quantum dot is an important low-dimensional semiconductor material, and its three dimensions are not more than twice the exciton Bohr radius of the corresponding semiconductor material. Quantum dots are generally spherical or quasi-spherical, and their diameter is often between 2-20 nm. Common quantum dots are composed of IV, II-VI, IV-VI or III-V elements, including but not limited to silicon quantum dots, germanium quantum dots, cadmium sulfide quantum dots, cadmium selenide quantum dots, cadmium telluride quantum dots Dots, zinc selenide quantum dots, lead sulfide quantum dots, lead selenide quantum dots, indium phosphide quantum dots and indium arsenide quantum dots, etc., by applying a certain electric field or light pressure to the quantum dots, they will emit specific frequencies The frequency of the emitted light will change with the size of this semiconductor, so the color of the light emitted can be controlled by adjusting the size of this nano-semiconductor. Thus, the ultraviolet light can be effectively converted into visible light with a predetermined color required for display by using quantum dots or quantum rods of different materials and sizes, and the light conversion efficiency is high, the color purity is high, and the display effect is good.

According to an embodiment of the present disclosure, referring to FIG. 4, the display panel may further include: a first protective layer 60 disposed on the surface of the first photonic crystal layer 30 close to the substrate 10. Therefore, the first protective layer 60 can separate the first photonic crystal layer from the second electrode 23 in the ultraviolet light emitting device, avoid the mutual influence of the materials of the first photonic crystal layer and the second electrode, and ensure the reliability of the display panel. Sex.

According to an embodiment of the present disclosure, referring to FIG. 5, the display panel may further include: a second protective layer 70 disposed on the surface of the second photonic crystal 50 layer close to the substrate 10. Therefore, the second protective layer can separate the second photonic crystal layer and the color conversion layer, avoid the mutual influence of the materials of the second photonic crystal layer and the color conversion layer, and ensure the reliability of the display panel.

Specifically, the material of the first protection layer 60 and the second protection layer 70 can be at least one of SiNx (ie silicon nitride), SiO ₂ and SiC, respectively. Therefore, the protection effect is good, the material source is wide, the price is low, and it can be conveniently prepared by conventional semiconductor technology.

According to an embodiment of the present disclosure, referring to FIG. 6, the display panel may further include: a planarization layer 80 disposed on a side of the color conversion layer 40 away from the substrate 10 and covering the Color conversion layer 40. As a result, the planarization layer can form a flat surface, which is beneficial to the subsequent preparation of the second protective layer or the second photonic crystal layer, and avoids the large step difference causing the second protective layer or the second photonic crystal layer to break and other defects, and ensure The reliability of the display panel increases the service life.

Specifically, the material of the planarization layer 80 may be at least one of polymethyl methacrylate, polyimide, and silicone materials. Therefore, the material sources are wide, the cost is low, and the display panel will not be negatively affected, and the preparation is easy.

According to an embodiment of the present disclosure, referring to FIG. 7, the display panel may further include: a color filter layer 90 disposed on a side of the second photonic crystal layer 50 away from the substrate 10. As a result, the color purity of the converted visible light can be further improved, stray light interference can be avoided, and the display quality of the display panel can be effectively improved. Those skilled in the art can understand that, in order to effectively achieve display, the color filter layer 90 may include a plurality of color filters 91 of different colors arranged at intervals, and each color filter is arranged corresponding to a color conversion layer (ie, one The orthographic projection of the color filter on the substrate covers the orthographic projection of a color conversion layer on the substrate), and the color of the correspondingly arranged color filter is consistent with the color of the color conversion layer.

In another aspect of the present disclosure, the present disclosure provides a method of manufacturing the aforementioned display panel. According to an embodiment of the present disclosure, the method includes: forming an ultraviolet light emitting device on one side of a substrate; forming a first photonic crystal layer on a side of the ultraviolet light emitting device away from the substrate; and forming a first photonic crystal layer away from the first photonic crystal layer. A plurality of color conversion layers are formed on the surface of the substrate, and a second photonic crystal layer is formed on the side of the color conversion layer away from the substrate. Through this method, the aforementioned display panel can be prepared quickly and conveniently, and the steps are simple, the operation is easy, there are no harsh requirements on technical personnel and equipment, and industrial production is easy to realize.

According to the embodiments of the present disclosure, the specific manufacturing method of the substrate is not particularly limited, and can be carried out according to conventional techniques. For example, a circuit structure (such as the substrate) can be formed on the substrate by deposition (such as chemical vapor deposition or physical vapor deposition) and photolithography. Thin film transistors, etc.), specifically, taking the gate in a thin film transistor as an example, a whole electrode layer can be deposited on the substrate, then a photoresist layer is formed on the electrode layer, and then the photoresist layer is sequentially exposed And developing to obtain a patterned photoresist, then etch the electrode layer that is not covered by the patterned photoresist (such as wet etching or dry etching), and finally remove the patterned photoresist. A gate of a predetermined shape is obtained. The manufacturing methods of other structures can be the same, and will not be repeated here.

According to the embodiments of the present disclosure, the ultraviolet light emitting device can also be performed through the above-mentioned deposition and photolithography processes. Specifically, the first electrode may be formed through the above-mentioned deposition and photolithography processes, and then the ultraviolet light-emitting layer and the second electrode may be formed through the deposition process in sequence. Two electrodes. In some specific embodiments, the ultraviolet light-emitting layer can also be formed by inkjet printing. Therefore, the process is relatively mature, the processing yield is high, and it is easy to realize large-scale production.

According to an embodiment of the present disclosure, the first photonic crystal layer and the second photonic crystal layer may be formed using the same method. In some specific embodiments, when the first photonic crystal layer and the second photonic crystal layer are three-dimensional photonic crystals, they can be stacked through dielectric rods, precision mechanical drilling, colloidal particle self-organized growth, colloidal solution self-organized growth, and semiconductor technology. It can be prepared in one or more ways, and the specific steps and parameters can be carried out in accordance with the conventional process, and will not be repeated here. In other specific embodiments, the first photonic crystal layer and the second photonic crystal layer are two-dimensional photonic crystals. In this case, they include a plurality of organic layers and inorganic layers alternately stacked. Among them, the inorganic layer can be deposited by chemical vapor deposition ( CVD) process, the organic layer can be prepared by evaporation or printing process. Therefore, the operation is simple, easy to implement, feasible, and cost-effective.

According to the embodiment of the present disclosure, the color conversion layer can be prepared by a printing process. Specifically, the material forming the color conversion layer can be formulated into ink, and then the color conversion layer of different colors can be printed sequentially by a printing device. The specific operation steps are as follows: Parameters, etc. can be carried out in accordance with the conventional printing process, and will not be repeated here.

According to an embodiment of the present disclosure, the method further includes at least one of the following steps: forming a first protective layer, forming a second protective layer, forming a planarization layer, and forming a color filter layer. Specifically, the first protective layer and the second protective layer may be formed by the above-mentioned deposition process, or they may be patterned by the above-mentioned photolithography process as required; the planarization layer may be formed by the above-mentioned deposition process (such as evaporation) or printing. The color filter layer can be formed by the above-mentioned deposition and photolithography process, or formed by a printing process. Among them, color filters of different colors can be formed step by step. For example, in some specific embodiments, the first The entire color resist layer of one color is then patterned through a photolithography process to obtain a color filter of the first color, and then repeat the above steps to form a second color color filter and a third color color filter in sequence Light sheets, etc.; in other embodiments, color filters of different colors can be formed directly through a printing process.

In yet another aspect of the present disclosure, the present disclosure provides a display device. According to an embodiment of the present disclosure, the display device includes the aforementioned display panel. The display device has a high color gamut, low energy consumption, and good viewing angle uniformity, does not have problems such as visual role deviation, and has high display quality.

According to the embodiments of the present disclosure, the specific type of the display device is not particularly limited. For example, it may include mobile phones, computer monitors, tablet computers, televisions, game consoles, wearable devices, etc. Of course, those skilled in the art can understand that, except For the display panel described above, the display device also includes the necessary structures and components of a conventional display device. Taking a mobile phone as an example, it may also include a touch screen, a fingerprint recognition module, a camera module, a motherboard, a storage, a housing, Structures and components of batteries, etc., will not be repeated here.

In the description of the present disclosure, it should be understood that the terms “first” and “second” are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present disclosure, "plurality" means two or more than two unless specifically defined otherwise.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean specific features described in conjunction with the embodiment or example , Structures, materials or characteristics are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples and the features of the different embodiments or examples described in this specification without contradicting each other.

Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present disclosure. A person of ordinary skill in the art can comment on the foregoing within the scope of the present disclosure. The embodiment undergoes changes, modifications, substitutions and modifications.

Claims

A display panel including:

Substrate

An ultraviolet light emitting structure, the ultraviolet light emitting structure is disposed on one side of the substrate;

A first photonic crystal layer, where the first photonic crystal layer is disposed on a side of the ultraviolet light-emitting structure away from the substrate and used to transmit ultraviolet light and reflect visible light;

A plurality of color conversion layers, the plurality of color conversion layers are arranged at intervals on a side of the first photonic crystal layer away from the substrate, and are used for converting ultraviolet light into visible light of different colors;

The second photonic crystal layer is arranged on the side of the color conversion layer away from the substrate and used to transmit visible light and reflect ultraviolet light.
The display panel of claim 1, wherein the center wavelength of the emission spectrum of the ultraviolet light-emitting structure is 380-430 nm.
The display panel of claim 1, wherein the ultraviolet light emitting structure comprises:

A plurality of first electrodes, the plurality of first electrodes are arranged at intervals on one side of the substrate, and the orthographic projection of each color conversion layer on the substrate covers an orthographic projection of the first electrode on the substrate projection;

An ultraviolet light-emitting layer for emitting ultraviolet light, and the ultraviolet light-emitting layer is disposed on a side of the first electrode away from the substrate;

The second electrode, the second electrode is arranged on a side of the ultraviolet light-emitting layer away from the substrate.
3. The display panel according to claim 3, wherein one of the first electrode and the second electrode that is far from the first photonic crystal layer is a reflective electrode, and the first electrode and the second electrode The other is a semi-transparent and semi-reverse electrode.
The display panel of claim 1, wherein the transmittance of the first photonic crystal layer to ultraviolet light is greater than or equal to 80%, and the reflectance of visible light is greater than or equal to 85%;

The reflectivity of the second photonic crystal layer to ultraviolet light is greater than or equal to 85%, and the transmittance of visible light is greater than or equal to 80%.
5. The display panel of claim 5, wherein the transmittance of the first photonic crystal layer to ultraviolet light is greater than or equal to 90%, and the reflectance of visible light is greater than or equal to 95%;

The reflectance of the second photonic crystal layer to ultraviolet light is greater than or equal to 95%, and the transmittance of visible light is greater than or equal to 90%.
The display panel of claim 1, wherein the first photonic crystal layer and the second photonic crystal layer are two-dimensional photonic crystals.
8. The display panel according to claim 7, wherein the first photonic crystal layer and the second photonic crystal layer each comprise a plurality of inorganic layers and organic layers alternately stacked, and satisfy at least one of the following conditions:

The ranges of the refractive index of the organic layer and the inorganic layer are respectively 1.3 to 2.4;

The material of the inorganic layer includes at least one of SiNx, SiO 2 , SiC, Al 2 O 3 , ZnS and ZnO;

The material of the organic layer includes polyvinylpyrrolidone, polyvinyl alcohol, 8-hydroxyquinoline aluminum, N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl -At least one of 4,4'-diamine and HAT-CN.
The display panel of claim 1, wherein the material of the color conversion layer includes quantum dots or quantum rods.
The display panel of claim 1, wherein the plurality of color conversion layers are arranged on a surface of the first photonic crystal layer away from the substrate at intervals.
The display panel according to claim 1, further comprising at least one of the following:

A first protective layer, the first protective layer is disposed on the surface of the first photonic crystal layer close to the substrate,

A second protective layer, the second protective layer is disposed on the surface of the second photonic crystal layer close to the substrate,

A planarization layer, the planarization layer is disposed on a side of the color conversion layer away from the substrate and covers the color conversion layer, and

A color filter layer, the color filter layer is arranged on a side of the second photonic crystal layer away from the substrate.
A method of manufacturing a display panel includes:

Forming an ultraviolet light emitting structure on one side of the substrate;

Forming a first photonic crystal layer on the side of the ultraviolet light emitting structure away from the substrate, the first photonic crystal layer being used to transmit ultraviolet light and reflect visible light;

Forming a plurality of color conversion layers arranged at intervals on the side of the first photonic crystal layer away from the substrate, and the color conversion layers are used to convert ultraviolet light into visible light of different colors;

A second photonic crystal layer is formed on the side of the color conversion layer away from the substrate, and the second photonic crystal layer is used to transmit visible light and reflect ultraviolet light.
The method of claim 12, further comprising forming at least one of:

A first protective layer, the first protective layer is disposed on the surface of the first photonic crystal layer close to the substrate,

A second protective layer, the second protective layer is disposed on the surface of the second photonic crystal layer close to the substrate,

A planarization layer, the planarization layer is disposed on a side of the color conversion layer away from the substrate and covers the color conversion layer, and

A color filter layer, the color filter layer is arranged on a side of the second photonic crystal layer away from the substrate.
A display device comprising the display panel according to any one of claims 1-11.