A display panel and display device

Abstract

This application belongs to the field of display technology and relates to a display panel, including a light-emitting module and a brightness adjustment device. The brightness adjustment device is disposed on the light-emitting side of the light-emitting module. The brightness adjustment device includes a plurality of adjustment units, and the light-emitting module includes a plurality of pixel units, with at least one pixel unit corresponding to at least one adjustment unit. This application also relates to a display device. The technical solution provided by this application can achieve consistent light emission brightness of the display panel, thereby improving the display effect.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically, to a display panel and a display device. Background Technology

[0002] In recent years, with the rapid development of display technology, quantum dot light-emitting devices (QLEDs) using quantum dot (QDs) materials as the light-emitting layer have received widespread attention. Colloidal quantum dots have attracted widespread attention due to their unique properties such as high quantum efficiency, high color purity, low-cost solution processability, and easily tunable emission wavelength. They are considered to be an alternative light-emitting material for next-generation lighting and display applications.

[0003] However, quantum dot light-emitting devices generally exhibit positive aging. As usage time increases, significant brightness differences may occur between different pixels in a quantum dot light-emitting display panel. Due to this poor consistency, it is impossible to adjust the driving current between different pixels using a pre-set driver program to achieve uniform brightness. This results in uneven brightness across different areas of the display panel, affecting the display effect. Summary of the Invention

[0004] This application provides a display panel that adopts the following technical solution:

[0005] It includes a light-emitting module and a brightness adjustment device, wherein the brightness adjustment device is disposed on the light-emitting side of the light-emitting module;

[0006] The brightness adjustment device includes several adjustment units, and the light-emitting module includes several pixel units, with at least one pixel unit corresponding to at least one adjustment unit.

[0007] To address the aforementioned technical problems, this application also provides a display device, including the display panel described above.

[0008] Compared with the prior art, the display panel of this application can adjust the light emission ratio and improve the display effect. Attached Figure Description

[0009] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the structure of one embodiment of the display panel provided in this application;

[0011] Figure 2 This is a schematic diagram of the liquid crystal molecule layer arrangement and light emission provided in this application;

[0012] Figure 3 This is a schematic diagram of the structure of the display panel provided in Embodiment 1 of this application;

[0013] Figure 4 This is a schematic diagram of the structure of the display panel provided in Embodiment 2 of this application;

[0014] Figure 5 This is a graph showing the relationship between light output ratio and voltage, provided in an embodiment of this application. Detailed Implementation

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0016] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0017] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0018] Assuming each pixel in the light-emitting module has an initial brightness of 1000 nits under a fixed drive current I, due to forward aging, the efficiency changes of each pixel vary significantly. After a period of use, some pixels may have a brightness of 2000 nits under drive current I, while others may have a brightness of 1500 nits. Because the consistency of forward aging of each pixel is poor, it is impossible to predict its brightness change in advance, and therefore it is impossible to change the drive current through a preset driver program to maintain consistent brightness across all pixels.

[0019] To address the aforementioned technical problems, this application provides a display panel, see [link to relevant documentation]. Figure 1As shown, the display panel includes a light-emitting module 100 and a brightness adjustment device 200. The brightness adjustment device 200 is disposed on the light-emitting side of the light-emitting module 100. The brightness adjustment device 200 includes a plurality of adjustment units 210. The light-emitting module 100 includes a plurality of pixel units. At least one pixel unit is disposed corresponding to at least one adjustment unit 210.

[0020] In this context, the light-emitting side of the light-emitting module 100 refers to the side of the light-emitting module 100 that emits light outwards. In some embodiments, when a top-emitting light-emitting device is disposed within the light-emitting module, the light-emitting side of the light-emitting module refers to the top of the light-emitting device, and the light-emitting direction is from the bottom of the light-emitting device to the top of the light-emitting device.

[0021] In some embodiments, each adjustment unit 210 independently includes a first polarizer 211, a first conductor 212, a liquid crystal molecule layer 213, a second conductor 214, and a second polarizer 215 stacked sequentially; the first polarizer 211 is disposed on the light-emitting side of the pixel unit, and the polarization directions of the first polarizer 211 and the second polarizer 215 are parallel to each other.

[0022] In this embodiment, the first conductor 212 and the second conductor 214 are arranged opposite to each other. In addition, in order to ensure that the polarization directions of the first polarizer 211 and the second polarizer 215 are parallel to each other, the first polarizer 211 and the second polarizer 215 can be placed in the same direction.

[0023] In some embodiments, the adjustment unit 210 corresponds one-to-one with the pixel unit, that is, one adjustment unit 210 corresponds to one pixel unit, and the orthographic projection of each adjustment unit 210 coincides with the orthographic projection of the corresponding pixel unit. By adjusting the brightness of the corresponding pixel unit through each adjustment unit 210, the display brightness of the display panel is made uniform and consistent.

[0024] See Figure 2 As shown, the natural light 001 emitted by the light-emitting module 100 first passes through the first polarizer 211 of the brightness adjustment device 200 to become polarized light in a specific direction. The polarized light then passes through the liquid crystal molecular layer 213 to reach the second polarizer 215. When no electric field is applied to the first conductor 212 and the second conductor 214, as... Figure 2 (a) The liquid crystal molecules in the liquid crystal layer 213 tend to maintain their natural twisted state. This arrangement changes the polarization direction of the light passing through the liquid crystal layer 213, so that when it reaches the second polarizer 215, its polarization direction is perpendicular to the polarization direction of the second polarizer 215. Therefore, the light 001 emitted by the light-emitting module 100 cannot be emitted at all. When a certain electric field is applied to the first conductor 212 and the second conductor 214, such as Figure 2(b) The liquid crystal molecules in the liquid crystal molecular layer 213 will rearrange to align with the direction of the electric field lines. At this time, the polarization direction of the light passing through the liquid crystal molecular layer 213 does not change, so it can pass smoothly through the second polarizer 215 and be emitted to the outside.

[0025] In other words, by cooperating with the first polarizer 211, the first conductor 212, the liquid crystal molecule layer 213, the second conductor 214, and the second polarizer 215, the magnitude of the electric field between the first conductor 212 and the second conductor 214 can be controlled, the degree of rearrangement of the liquid crystal molecules in the liquid crystal molecule layer 213 can be changed, and the proportion of light emitted by the light-emitting module 100 to the outside can be controlled, thereby adjusting the light output brightness of the brighter pixel unit to be the same as that of the darker pixel unit.

[0026] In some embodiments, the light-emitting module 100 includes a substrate 101 and a pixel defining layer 102 disposed on the substrate 101. The pixel defining layer 102 has a plurality of pixel openings 1021, and pixel units are disposed within the pixel openings 1021. The forward projection of a first conductor 212 on the substrate 101 at least partially overlaps with the forward projection of the pixel opening 1021 on the substrate 101; the forward projection of a second conductor 214 on the substrate 101 at least partially overlaps with the forward projection of the pixel opening 1021 on the substrate 101. The pixel openings 1021 are printed areas, and the area between every two pixel openings 1021 is a non-printed area.

[0027] The conductor and its forward projection on the substrate 101 at least partially overlap with the forward projection of the pixel opening 1021 on the substrate 101, which allows the liquid crystal molecules corresponding to the pixel opening 1021 to be under the influence of an electric field, which helps to deflect the liquid crystal molecules.

[0028] Optionally, the forward projection of the first conductor 212 on the substrate 101 is located within the forward projection of the pixel opening 1021 on the substrate 101, and the forward projection of the second conductor 214 on the substrate 101 is located within the forward projection of the pixel opening 1021 on the substrate 101.

[0029] In this embodiment, the forward projection of the conductor on the substrate 101 is located within the forward projection of the pixel opening 1021 on the substrate 101, which allows all the liquid crystal molecules corresponding to the pixel opening 1021 to be under the action of a uniform electric field, so that the deflection angle of the liquid crystal molecules is consistent, and the brightness of the light emitted from the same pixel unit will be uniform.

[0030] In this embodiment, the pixel opening 1021 can serve as a functional layer ink reservoir, allowing the printed functional layer ink to be deposited and dried layer by layer. This prevents excessive ink diffusion at the edges, helps to form clearer pixel boundaries, improves the uniformity of film formation and device performance, and effectively prevents the adhesion and penetration of water molecules, thereby improving the reliability and stability of the device.

[0031] In some embodiments, the adjustment unit 210 further includes a driving module 201 and / or a brightness acquisition module 202. The driving module 201 is used to apply a voltage signal to drive the first conductor 212 and the second conductor 214 to generate an electric field. The brightness acquisition module 202 is used to acquire the light emission brightness of the pixel unit. The driving module 201 and the brightness acquisition module 202 are disposed on the first polarizer 211.

[0032] The forward projection of the brightness acquisition module 202 on the substrate 101 is located within the forward projection of the pixel opening 1021 on the substrate 101. Preferably, the sum of the forward projections of the brightness acquisition module 202 and the first conductor 212 on the substrate 101 is not less than the forward projection of the pixel opening 1021 on the substrate 101.

[0033] In one specific embodiment, the brightness acquisition module 202 can be located on the side of the first polarizer 211 near the light-emitting module 100, and the forward projection of the brightness acquisition module 202 on the substrate 101 is located inside the forward projection of the pixel opening 1021 on the substrate 101. The brightness acquisition module 202 and the pixel unit are each connected to a power supply via a circuit. After power is applied, the light emitted by the pixel unit illuminates the brightness acquisition module 202, and the brightness acquisition module 202 acquires the brightness of the pixel unit.

[0034] In one specific example, the driving module 201 may be located on the side of the first polarizer 211 close to the light-emitting module 100, and the forward projection of the driving module 201 is located on the pixel defining layer 102. The forward projection area of ​​the brightness acquisition module 202 is smaller than the forward projection area of ​​the first conductor 212.

[0035] It should be understood that the size of the area of ​​the first conductor 212 determines the size of the light-emitting area. The brightness acquisition module 202 needs to collect light, but this part of the brightness acquisition module 202 cannot emit light. In order to ensure the light-emitting area, the area of ​​the first conductor 212 should be as large as possible, and the area of ​​the brightness acquisition module 202 should be as small as possible.

[0036] In this embodiment, the brightness acquisition module 202 can acquire and feedback the light emission brightness of each pixel unit of the light emission module 100. The driving module 201 controls the magnitude of the electric field between the first conductor 212 and the second conductor 214 according to the light emission brightness fed back by the brightness acquisition module 202, changes the degree of rearrangement of the liquid crystal molecule layer 213, and controls the proportion of light emitted by the light emission module 100 to be emitted to the outside, thereby adjusting the light emission brightness of the brighter pixel to be the same as that of the darker pixel. For example, after the light-emitting module 100 has been used for a period of time, some pixels have a brightness of 2000 nits under the driving current I, while other pixels have a brightness of 1500 nits under the driving current I. With a fixed driving current I, the driving module 201 controls the magnitude of the electric field between the first conductor 212 and the second conductor 214, changes the degree of rearrangement of the liquid crystal molecule layer 213, so that the pixels with a brightness of 1500 nits emit 100% light and the pixels with a brightness of 2000 nits emit 75% light, so that the brightness of the entire display panel is 1500 nits.

[0037] In some embodiments, the first polarizer 211 and the second polarizer 215 are each independently selected from at least one of the following: an absorption-type linear polarizer, a high-density polyethylene linear polarizer, a grating-type linear polarizer, a stacked linear polarizer, a metal linear polarizer, a chemically stained linear polarizer, and a polycrystalline silicon linear polarizer.

[0038] In some embodiments, the first conductor 212 is a first electrode, and the second conductor 214 is a second electrode. The first electrode and the second electrode are each independently selected from at least one of transparent metal oxide, graphene, and carbon nanotubes. The transparent metal oxide is selected from at least one of indium tin oxide, zinc oxide, tin oxide, titanium dioxide, zirconium oxide, magnesium oxide, beryllium oxide, aluminum oxide, and yttrium oxide; and / or,

[0039] In some embodiments, the forward projection of the first conductor 212 on the substrate 101 completely overlaps with the forward projection of the second conductor 214 on the substrate 101.

[0040] In some embodiments, the liquid crystal molecules of the liquid crystal molecule layer 213 are selected from twisted nematic liquid crystals.

[0041] In some embodiments, the driving module 201 is selected from at least one of amorphous silicon thin-film transistors, polycrystalline silicon thin-film transistors, and oxide thin-film transistors.

[0042] In some embodiments, the brightness acquisition module 202 is selected from at least one of a photoresistor, a photodiode, a photomultiplier tube, and a phototransistor.

[0043] In some embodiments, see Figure 1As shown, the pixel unit includes an anode 103 and a cathode 104 disposed opposite to each other, and a light-emitting layer 105 and / or a hole functional layer 106 and / or an electronic functional layer 107 disposed between the anode 103 and the cathode 104.

[0044] The light-emitting layer 105 is disposed between the anode 103 and the cathode 104, the hole functional layer 106 is disposed between the anode 103 and the light-emitting layer 105, and the electron functional layer 107 is disposed between the light-emitting layer 105 and the cathode 104.

[0045] In some embodiments, the hole functional layer 106 may be a hole injection layer 1061, a hole transport layer 1062, or a stacked hole injection layer 1061 and a hole transport layer 1062, wherein the hole injection layer 1061 is adjacent to the anode 103.

[0046] In some embodiments, the electronic functional layer 107 may be an electron transport layer 1071, an electron injection layer (not shown in the figure), or a stacked electron injection layer and an electron transport layer 1071, wherein the electron injection layer is adjacent to the cathode 104.

[0047] In some embodiments, the material of the light-emitting layer includes one or more of organic light-emitting materials and quantum dots, wherein the organic light-emitting material is selected from 4,4'-bis(N-carbazole)-1,1'-biphenyl:tris[2-(p-tolyl)pyridinium(III), 4,4',4”-tris(carbazole-9-yl)triphenylamine:tris[2-(p-tolyl)pyridinium, diaromatic anthracene derivatives, stilbene aromatic derivatives, pyrene derivatives, fluorene derivatives, TBPe fluorescent materials, TTPX fluorescent materials, TBRb fluorescent materials, and DBP fluorescent materials. The quantum dots are selected from one or more of the following: optical materials, delayed fluorescence materials, TTA materials, thermally activated delayed materials, polymers containing BN covalent bonds, hybrid localized charge transfer excited-state materials, excitopolymer luminescent materials, polyacetylene and its derivatives, poly(p-phenylene) and its derivatives, polythiophene and its derivatives, and polyfluorene and its derivatives. The quantum dots include one or more of single-component quantum dots, core-shell quantum dots, inorganic perovskite quantum dots, organic perovskite quantum dots, and organic-inorganic hybrid perovskite quantum dots. The core-shell quantum dots include one or more shells. The materials of the single-component quantum dots, the core of the core-shell quantum dots, and the shell of the core-shell quantum dots are each independently selected from at least one of group II-VI compounds, group III-VI compounds, group III-V compounds, group IV-VI compounds, or group I-III-VI compounds. Specifically, the group II-VI compounds are selected from CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, CdSeS, CdSeTe, and CdS. Te, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnS e. One or more of HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe and HgZnSTe,The group III-V compounds are selected from one or more of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, and InAlPSb, and the group III-VI compounds are selected from one or more of In2S3, In2Se3, InGaS3, and InGaSe3. The group IV-VI compounds are selected from one or more of SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, and SnPbSTe. The group I-III-VI compounds are selected from AgInS, AgInS2, and CuI. The inorganic perovskite quantum dots are selected from one or more of nS, CuInS2, AgGaS2, CuGaS2, CuGaO2, AgGaO2, AgAlO2, AgInGaS2, and CuInGaS2, with the general structural formula QJT3 for the inorganic perovskite quantum dots, the general structural formula GJT3 for the organic-inorganic hybrid perovskite quantum dots, and the general structural formula LJT3 for the organic perovskite quantum dots. J is a divalent metal cation, and each occurrence of J is independently selected from Pb. 2+ Sn 2+ Cu 2+ Ni 2+ Cd 2+ Cr 2+ Mn 2+ Co 2+ Fe 2+ 、Ge 2+ Yb 2+ And one or more of Eu2+, where T is independently selected from one or more of Cl-, Br-, and I- each time it appears, and Q is Cs. + G is selected from CH3(CH2). n-2 NH3 + Or [NH3(CH2)nNH3] 2+ , n≥2, L is selected from formamidinyl.

[0048] In some embodiments, the hole functional layer includes a hole injection layer and / or a hole transport layer. The hole injection layer is made of at least one material selected from poly(3,4-vinyldioxythiophene):poly(styrenesulfonic acid), copper phthalocyanine, titanium phthalocyanine, 4,4',4'-tris(N-3-methylphenyl-N-phenylamino)triphenylamine, 4,4',4'-tris[2-naphthylphenylamino]triphenylamine, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone, 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazabenzophenanthrene, transition metal oxides, or transition metal chalcogenides. The transition metal oxide is selected from NiO. x MoO x WO x CrO x or CuO x At least one of the following, wherein the transition metal chalcogenide compound is selected from MoS x MoSe x WS x 、WSe x or CuS x At least one of the following; and / or, the material of the hole transport layer is selected from poly(9,9-dioctylfluorene-CO-N-(4-butylphenyl)diphenylamine), 3-hexyl-substituted polythiophene, poly(9-vinylcarbazole), poly[bis(4-phenyl)(4-butylphenyl)amine], poly(N,N'-bis(4-butylphenyl)-N,N'-diphenyl-1,4-phenylenediamine-CO-9,9-dioctylfluorene), 4,4',4”-tris(carbazole-9-yl)triphenylamine, 4,4'- At least one of the following: bis(9-carbazole)biphenyl, N,N'-diphenyl-N,N'-di(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine, N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine, poly(3,4-ethylenedioxythiophene): poly(styrene sulfonic acid), doped or undoped graphene, C60, NiO, MoO3, WO3, V2O5, CrO3, CuO, or p-type gallium nitride.

[0049] In some embodiments, the HOMO level of the hole transport layer is 5.0–6.0 eV, and the hole mobility is 10-1. -5 ~10 - 3 cm 2 / Vs.

[0050] In some embodiments, the electronic functional layer includes an electron injection layer and / or an electron transport layer, wherein the materials of the electron transport layer and the electron injection layer independently include at least one of inorganic materials and organic materials, respectively; the inorganic materials are selected from one or more of doped or undoped zinc oxide, barium oxide, aluminum oxide, titanium oxide, tin oxide, tantalum oxide, zirconium oxide, nickel oxide, lithium titanium oxide, zinc aluminum oxide, zinc manganese oxide, zinc tin oxide, lithium zinc oxide, indium tin oxide, cadmium sulfide, zinc sulfide, molybdenum sulfide, tungsten sulfide, copper sulfide, zinc tin sulfide, indium phosphide, gallium phosphide, copper indium sulfide, copper gallium sulfide, and barium titanate, and the doped elements include one or more of aluminum, magnesium, lithium, manganese, yttrium, lanthanum, copper, nickel, zirconium, cerium, and gadolinium.

[0051] In some embodiments, the anode is a metallic material with a reflectivity ≥90%, including a doped metal oxide electrode, a composite electrode, a single-element metal electrode, or an alloy electrode. The doped metal oxide electrode material includes one or more of indium-doped tin oxide, zinc-doped tin oxide, fluorine-doped tin oxide, antimony-doped tin oxide, aluminum-doped zinc oxide, gallium-doped zinc oxide, indium-doped zinc oxide, magnesium-doped zinc oxide, aluminum-doped magnesium oxide, and cadmium-doped zinc oxide. The composite electrode includes AZO / Ag / AZO, AZO / APC / AZO, ITO / Ag / ITO, ITO / APC / ITO, IZO / Ag / IZO, and IZO. The metal element electrode is made of one or more of Ag, Ni, Pt, Au, Ir, Cu, Mo, Al, Ca, Mg, and Ba, and the alloy electrode includes an Au:Mg alloy electrode or an Ag:Mg alloy electrode.

[0052] In some embodiments, the cathode is a transparent electrode, selected from transparent metal oxide electrodes, graphene electrodes, carbon nanotube electrodes, elemental metal electrodes, or alloy electrodes. The transparent metal oxide electrode is selected from one or more of indium tin oxide, zinc oxide, tin oxide, titanium dioxide, zirconium oxide, magnesium oxide, beryllium oxide, aluminum oxide, and yttrium oxide. The material of the elemental metal electrode includes one or more of Ag, Ni, Pt, Au, Ir, Cu, Mo, Al, Ca, Mg, and Ba. The alloy electrode includes an Au:Mg alloy electrode or an Ag:Mg alloy electrode.

[0053] In some embodiments, the pixel defining layer is made of a hydrophobic material selected from at least one of polyamide, polyimide, polysiloxane, polymethyl methacrylate, polybutyl methacrylate, polycyclohexyl methacrylate, polystyrene, polyisoprene, polyhexafluoropropylene, fluorinated poly(p-xylene), fluorinated polysiloxane, fluorinated polyimide, and fluorinated polyamide.

[0054] In some embodiments, the substrate 101 is a TFT array backplane, the anode 103 is disposed on the TFT array backplane, and the anode 103 is connected to the drain of the TFT array backplane.

[0055] In this embodiment, the TFT array backplane includes a substrate 1011 and a TFT device 1012. The substrate 1011 can be a rigid glass substrate or a flexible substrate. The glass substrate includes soda-lime glass, borosilicate glass or quartz substrate; the flexible substrate includes PET substrate or PI substrate.

[0056] In some embodiments, see Figure 1 As shown, the display panel also includes a planarization layer 300 and / or an encapsulation layer 400. The planarization layer 300 is disposed between the light-emitting module 100 and the brightness adjustment device 200, and the encapsulation layer 400 is disposed on the brightness adjustment device 200.

[0057] Below the planarization layer 300 is an uneven pixel defining layer 102, and above the planarization layer 300 is a first polarizer 211. If the polarizer is directly placed on the uneven pixel defining layer 102, the light waves passing through the polarizer may be subjected to different degrees of polarization filtering in different areas, thereby affecting the overall polarization effect and the uniformity of light intensity distribution. Therefore, this application sets a planarization layer 300 between the light-emitting module 100 and the brightness adjustment device 200 to planarize the surface unevenness caused by the pixel defining layer 102, provide a flat surface foundation for the placement of the first polarizer 211, reduce the scattering and absorption loss of light inside the device, and improve the polarization effect.

[0058] In this embodiment, the encapsulation layer 400 can effectively isolate moisture, oxygen, pollutants and other harmful substances in the external environment, preventing them from corroding the light-emitting material, thereby extending the service life of the display panel. In addition, it can optimize the propagation path of light inside the device, reduce light scattering and absorption loss, and improve the display effect.

[0059] In some embodiments, the material of the planarization layer 300 is selected from at least one of transparent polyimide, polymethyl methacrylate, polybutyl methacrylate, polycyclohexyl methacrylate, polystyrene, polyethylene, polypropylene, polyhexafluoropropylene, polyethylene terephthalate, and polyethylene naphthalate.

[0060] In some embodiments, the encapsulation layer 400 is an alternating stacked structure of inorganic material / organic material / inorganic material, wherein the organic material is selected from at least one of epoxy resin, phenolic resin, polyester, and organosilicon, and the inorganic material is selected from at least one of silicon oxide, aluminum oxide, zinc oxide, magnesium oxide, titanium oxide, zirconium oxide, silicon nitride, and aluminum nitride.

[0061] The following specific embodiments will be used to illustrate the contents of this application in more detail and to further elaborate on this application, but these embodiments are by no means intended to limit this application.

[0062] Example 1

[0063] This embodiment provides a display panel, the preparation method of which is as follows:

[0064] Step 1: Select a glass substrate and clean it using a glass cleaning machine (including a UV module, a cleaning brush module, a high-pressure water module, a water-air two-fluid module, an ultrasonic module, and a drying module).

[0065] Step 2: Using magnetron sputtering, chemical vapor deposition and photolithography, IGZO TFTs and ITO / Ag / ITO (10 / 100 / 10nm) composite anodes are fabricated on a glass substrate, and the composite anodes are connected to the drain of the TFTs.

[0066] Step 3: On the IGZO TFT glass substrate with composite anode, a polyimide adhesive is coated to form a pixel boundary layer, and the pixel boundary layer is patterned using a photolithography process to form pixel openings.

[0067] Step four: Print PEDOT:PSS ink into the pixel openings using inkjet printing technology, and then pass through 10... -3 The solvent was removed using a vacuum drying process with Pa300s, followed by annealing at 150°C for 30 minutes to form a hole injection layer. TFB ink was then printed onto the hole injection layer using 10... -3 The solvent was removed by vacuum drying at 300 Pa, followed by annealing at 200°C for 30 min to form a hole transport layer; CdSe quantum dot ink was then printed on the hole transport layer using 10 -3 The solvent was removed by vacuum drying at 300 Pa for 10 minutes, followed by annealing at 100°C for 10 minutes to form a quantum dot luminescent layer. ZnO ink was then printed onto the quantum dot luminescent layer using 10... -3 The solvent is removed by vacuum drying at 300 Pa for 10 min, and then annealed at 100 °C for 10 min to form an electron-hole transport layer.

[0068] Step 5: On the electron transport layer, Ag is deposited by thermal evaporation at a vacuum degree of 3x10⁻⁶. -4 Pa, with a velocity of 1 angstrom / second and a thickness of 20 nm, forms a cathode.

[0069] Step 6: Use inkjet printing to print polyimide ink on the cathode, allow it to stand and level, and then cure it with ultraviolet light to form a flat layer.

[0070] Step 7: An iodine-based polarizer, consisting of iodine molecules bonded to polyvinyl alcohol, is deposited on the planarization layer to form a first polarizer. Then, ITO is deposited on the first polarizer at the position corresponding to the pixel opening to form a first electrode. A photodiode is then placed on the first polarizer to form a brightness acquisition module. Note that the sum of the projected areas of the first electrode and the brightness acquisition module covers the entire pixel opening. An amorphous silicon thin-film transistor is then placed on the first polarizer at the position corresponding to the non-pixel opening to form a driving module.

[0071] Step 8: Select an iodine-based polarizer in which iodine molecules are combined with polyvinyl alcohol as the second polarizer, and deposit ITO on the second polarizer to form the second electrode.

[0072] Step nine: Invert the second polarizer with the second electrode onto the first polarizer with the first electrode, and ensure that the orthogonal projection of the first electrode and the second electrode are completely superimposed through optical precision alignment.

[0073] Step 10: Liquid crystal molecular material is injected into the gap between the first polarizer and the second polarizer to form a liquid crystal molecular layer.

[0074] Step 11: Prepare a silicon oxide / epoxy resin / silicon oxide encapsulation layer on the second polarizer to complete the device fabrication.

[0075] In this embodiment, see Figure 3 As shown, taking the illumination of three pixels as an example, under the driving current I1, the brightness L of pixel A of the light-emitting module 100 is... 001 =1000 nits, the brightness L of pixel B 002 =1000 nits, the brightness L of pixel C 003 =1000 nits, at this time the brightness collected by the brightness acquisition module 202 corresponding to each pixel is consistent. The driving module 201 corresponding to each pixel receives the signal sent by the brightness acquisition module 202 and controls the voltage between the first electrode 212 and the second electrode 214 corresponding to each pixel to be V1, so that the liquid crystal molecules of the liquid crystal molecule layer 213 are completely aligned along the electric field lines. Therefore, the light emitted by pixels A, B and C of the light-emitting module 100 can all be emitted, and the brightness is E respectively. 001 E 002 E 003 And E 001 =E 002 =E 003 At this time, the brightness distribution of the luminous display panel appears uniform to the user's eye.

[0076] Example 2

[0077] The display panel provided in this embodiment uses the same materials and is prepared in the same way as the display panel in Embodiment 1.

[0078] The difference is: see Figure 4 As shown, taking the illumination of three pixels as an example, under the driving current I1, the brightness L of pixel A of the light-emitting module 100 is... 001 =1000 nits, the brightness L of pixel B 002 =1500 nits, the brightness L of pixel C 003 =1800 nits, at this point the brightness collected by the brightness acquisition module 202 for each pixel is inconsistent. The driving module 201 for each pixel receives the signal from the brightness acquisition module 202 and controls the voltage between the first electrode and the second electrode for each pixel to be V. A V B V C And V A >V B >V C This causes the liquid crystal molecules corresponding to pixels C, B, and A to sequentially increase their deflection angles, controlling the light emitted by pixel A to be 100% emitted, the light emitted by pixel B to be 66.7% emitted, and the light emitted by pixel C to be 55.6% emitted, with emitted brightness values ​​of E respectively. 001 =L 001 ×100%, E 002 =L 002 ×66.67%, E 003 =L 003 ×55.56%, therefore E 001 =E 002 =E 003 At this time, the user's eye perceives the brightness distribution of the light-emitting display panel as uniform, thus offsetting the L... 001 L 002 L 003 The problem of inconsistent brightness.

[0079] In this embodiment, the relationship between the light emission ratio of the brightness adjustment device 200 and the voltage V between the first electrode and the second electrode is as follows: Figure 5 As shown.

[0080] In Example 1, since the brightness of all three pixels is 1000 nits, the light emission ratio of the brightness adjustment device 200 is kept at 100%. At this time, the voltage between the first and second electrodes is set to 6V, allowing the liquid crystal molecules to align completely along the electric field lines. In Example 2, light emission ratios of 100%, 66.67%, and 55.56% are required. Therefore, based on the curve, V... A=6V, V B =3.366V, V C =3.105V, thereby controlling the electric field between the first electrode and the second electrode through the driving module 201, changing the degree of rearrangement of the liquid crystal molecules in the liquid crystal molecule layer 213, and thus controlling the light emission ratio.

[0081] This demonstrates that the display panel of this application can adjust the light emission ratio according to the actual light emission brightness of each pixel unit through the adjustment unit of the brightness adjustment device, so that the light emission brightness is consistent and the display effect is improved.

[0082] This application also provides a display device, which includes the display panel provided in the embodiments of this application.

[0083] The display panel of this application has the function of adjusting the light emission ratio according to the actual light emission brightness of each pixel unit through the adjustment unit of the brightness adjustment device, thereby adjusting the pixel brightness. Correspondingly, the display device can also adjust the light emission ratio according to the actual light emission brightness of each pixel unit through the adjustment unit of the brightness adjustment device, so that the light emission brightness is consistent and the display effect is improved.

[0084] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A display panel, characterized by, It includes a light-emitting module and a brightness adjustment device, wherein the brightness adjustment device is disposed on the light-emitting side of the light-emitting module; The brightness adjustment device includes several adjustment units, and the light-emitting module includes several pixel units, with at least one pixel unit corresponding to at least one adjustment unit.

2. The display panel according to claim 1, characterized in that, The adjustment unit includes a first polarizer, a first conductor, a liquid crystal molecule layer, a second conductor, and a second polarizer stacked sequentially; the first polarizer is disposed on the light-emitting side of the pixel unit, and the polarization directions of the first polarizer and the second polarizer are parallel to each other; and / or, The adjustment unit corresponds one-to-one with the pixel unit.

3. The display panel according to claim 2, characterized in that, The light-emitting module includes a substrate and a pixel defining layer disposed on the substrate. The pixel defining layer has a plurality of pixel openings, and the pixel unit is disposed in the pixel opening. The forward projection of the first conductor on the substrate and the forward projection of the pixel opening on the substrate at least partially overlap. The forward projection of the second conductor on the substrate at least partially overlaps with the forward projection of the pixel opening on the substrate.

4. The display panel according to claim 1, characterized in that, The adjustment unit further includes a driving module and / or a brightness acquisition module. The driving module is used to apply a voltage signal to drive the first conductor and the second conductor to generate an electric field. The brightness acquisition module is used to acquire the luminous brightness of the pixel unit. The forward projection of the brightness acquisition module on the substrate is located within the forward projection of the pixel opening on the substrate. Optionally, the sum of the forward projections of the brightness acquisition module and the first conductor on the substrate is not less than the forward projection of the pixel opening on the substrate.

5. The display panel according to claim 4, characterized in that, The first polarizer and the second polarizer are each independently selected from at least one of the following: absorption-type linear polarizer, high-density polyethylene linear polarizer, grating-type linear polarizer, stacked linear polarizer, metal linear polarizer, chemically stained linear polarizer, and polycrystalline silicon linear polarizer; and / or, The first conductor uses a first electrode, and the second conductor uses a second electrode. The first electrode and the second electrode are each independently selected from at least one of transparent metal oxides, graphene, and carbon nanotubes. The transparent metal oxide is selected from at least one of indium tin oxide, zinc oxide, tin oxide, titanium dioxide, zirconium oxide, magnesium oxide, beryllium oxide, aluminum oxide, and yttrium oxide; and / or, The forward projection of the first conductor on the substrate completely overlaps with the forward projection of the second conductor on the substrate; and / or, The liquid crystal molecules in the liquid crystal molecular layer are selected from twisted nematic liquid crystals; and / or, The driving module is selected from at least one of amorphous silicon thin-film transistors, polycrystalline silicon thin-film transistors, and oxide thin-film transistors; and / or, The brightness acquisition module is selected from at least one of photoresistors, photodiodes, photomultiplier tubes, and phototransistors.

6. The display panel according to claim 3, characterized in that, The pixel unit includes an anode and a cathode disposed opposite to each other, and a light-emitting layer and a hole functional layer and / or an electronic functional layer disposed between the anode and the cathode; The light-emitting layer is disposed between the anode and the cathode, the hole functional layer is disposed between the anode and the light-emitting layer, and the electron functional layer is disposed between the light-emitting layer and the cathode; The material of the light-emitting layer includes one or more of organic light-emitting materials and quantum dots. The organic light-emitting materials are selected from 4,4'-bis(N-carbazole)-1,1'-biphenyl:tris[2-(p-tolyl)pyridinium(III), 4,4',4”-tris(carbazole-9-yl)triphenylamine:tris[2-(p-tolyl)pyridinium, diaromatic anthracene derivatives, stilbene aromatic derivatives, pyrene derivatives, fluorene derivatives, TBPe fluorescent materials, TTPX fluorescent materials, TBRb fluorescent materials, DBP fluorescent materials, and extended... The quantum dots are selected from one or more of the following: delayed fluorescence materials, TTA materials, thermally activated delayed materials, polymers containing BN covalent bonds, hybrid localized charge transfer excited-state materials, excitopolymer luminescent materials, polyacetylene and its derivatives, poly(p-phenylene) and its derivatives, polythiophene and its derivatives, and polyfluorene and its derivatives. The quantum dots include one or more of single-component quantum dots, core-shell quantum dots, inorganic perovskite quantum dots, organic perovskite quantum dots, and organic-inorganic hybrid perovskite quantum dots. The core-shell quantum dots include one or more shells. The materials of the single-component quantum dots, the core of the core-shell quantum dots, and the shell of the core-shell quantum dots are each independently selected from at least one of group II-VI compounds, group III-VI compounds, group III-V compounds, group IV-VI compounds, or group I-III-VI compounds. Specifically, the group II-VI compounds are selected from CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, CdSeS, CdSeTe, and CdST. e. ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnS e. One or more of HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe and HgZnSTe,The group III-V compounds are selected from one or more of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, and InAlPSb, and the group III-VI compounds are selected from one or more of In2S3, In2Se3, InGaS3, and InGaSe3. The group IV-VI compounds are selected from one or more of SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, and SnPbSTe. The group I-III-VI compounds are selected from AgInS, AgInS2, and CuI. The inorganic perovskite quantum dots are selected from one or more of nS, CuInS2, AgGaS2, CuGaS2, CuGaO2, AgGaO2, AgAlO2, AgInGaS2, and CuInGaS2, with the general structural formula QJT3 for the inorganic perovskite quantum dots, the general structural formula GJT3 for the organic-inorganic hybrid perovskite quantum dots, and the general structural formula LJT3 for the organic perovskite quantum dots. J is a divalent metal cation, and each occurrence of J is independently selected from Pb. 2+ Sn 2+ Cu 2+ Ni 2+ Cd 2+ Cr 2+ Mn 2+ Co 2+ Fe 2+ 、Ge 2+ Yb 2+ and Eu 2+ One or more of these, where T is independently selected from one or more of Cl-, Br-, and I- each time it appears, and Q is Cs. + G is selected from CH3(CH2)n-2NH3 + Or [NH3(CH2)nNH3] 2+ n≥2, L is selected from formamidinyl; and / or, The hole functional layer includes a hole injection layer and / or a hole transport layer. The hole injection layer is made of at least one material selected from poly(3,4-vinyldioxythiophene):poly(styrene sulfonic acid), copper phthalocyanine, titanium phthalocyanine, 4,4',4'-tris(N-3-methylphenyl-N-phenylamino)triphenylamine, 4,4',4'-tris[2-naphthylphenylamino]triphenylamine, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanodimethyl-p-benzoquinone, 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazabenzophenanthrene, transition metal oxides, or transition metal chalcogenides. The transition metal oxide is selected from NiO. x MoO x WO x CrO x or CuO x At least one of the following, wherein the transition metal chalcogenide compound is selected from MoS x MoSe x WS x 、WSe x or CuS x At least one of them; and / or, The HOMO level of the hole transport layer is 5.0–6.0 eV, and the hole mobility is 10-1. -5 ~10 -3 cm 2 / Vs; and or, The hole transport layer is made of materials selected from poly(9,9-dioctylfluorene-CO-N-(4-butylphenyl)diphenylamine), 3-hexyl-substituted polythiophene, poly(9-vinylcarbazole), poly[bis(4-phenyl)(4-butylphenyl)amine], poly(N,N'-bis(4-butylphenyl)-N,N'-diphenyl-1,4-phenylenediamine-CO-9,9-dioctylfluorene), 4,4',4”-tris(carbazole-9-yl)triphenylamine, and 4,4'-bis(9-carbazole). At least one of the following: biphenyl, N,N'-diphenyl-N,N'-di(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine, N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine, poly(3,4-vinyldioxythiophene):poly(styrenesulfonic acid), doped or undoped graphene, C60, NiO, MoO3, WO3, V2O5, CrO3, CuO, or p-type gallium nitride; and / or, The electronic functional layer includes an electron injection layer and / or an electron transport layer, wherein the materials of the electron transport layer and the electron injection layer independently include at least one of inorganic materials and organic materials, respectively; the inorganic materials are selected from one or more of the following: doped or undoped zinc oxide, barium oxide, aluminum oxide, titanium oxide, tin oxide, tantalum oxide, zirconium oxide, nickel oxide, lithium titanium oxide, zinc aluminum oxide, zinc manganese oxide, zinc tin oxide, zinc lithium oxide, indium tin oxide, cadmium sulfide, zinc sulfide, molybdenum sulfide, tungsten sulfide, copper sulfide, zinc tin sulfide, indium phosphide, gallium phosphide, copper indium sulfide, copper gallium sulfide, and barium titanate; and the doped elements include one or more of the following: aluminum, magnesium, lithium, manganese, yttrium, lanthanum, copper, nickel, zirconium, cerium, and gadolinium.

7. The display panel according to claim 6, characterized in that, The anode is a metallic material with a reflectivity ≥90%, including a doped metal oxide electrode, a composite electrode, a single-element metal electrode, or an alloy electrode. The doped metal oxide electrode material includes one or more of the following: indium-doped tin oxide, zinc-doped tin oxide, fluorine-doped tin oxide, antimony-doped tin oxide, aluminum-doped zinc oxide, gallium-doped zinc oxide, indium-doped zinc oxide, magnesium-doped zinc oxide, aluminum-doped magnesium oxide, and cadmium-doped zinc oxide. The composite electrode includes AZO / Ag / AZO, AZO / APC / AZO, ITO / Ag / ITO, ITO / APC / ITO, IZO / Ag / IZO, and IZO / APC / ... The metal element electrodes are made of one or more of the following materials: IZO, ZnO / Ag / ZnO, ZnO / APC / ZnO, TiO2 / Ag / TiO2, TiO2 / APC / TiO2, ZnS / Ag / ZnS, ZnS / Al / ZnS, Ca / Al, LiF / Ca, LiF / Al, BaF2 / Al, CsF / Al, CaCO3 / Al, or BaF2 / Ca / Al. The alloy electrodes include Au:Mg alloy electrodes or Ag:Mg alloy electrodes; and / or... The cathode is a transparent electrode, selected from transparent metal oxide electrodes, graphene electrodes, carbon nanotube electrodes, elemental metal electrodes, or alloy electrodes. The transparent metal oxide electrode is selected from one or more of indium tin oxide, zinc oxide, tin oxide, titanium dioxide, zirconium oxide, magnesium oxide, beryllium oxide, aluminum oxide, and yttrium oxide. The elemental metal electrode is made of one or more of Ag, Ni, Pt, Au, Ir, Cu, Mo, Al, Ca, Mg, and Ba. The alloy electrode includes an Au:Mg alloy electrode or an Ag:Mg alloy electrode; and / or... The pixel defining layer is made of a hydrophobic material selected from at least one of polyamide, polyimide, polysiloxane, polymethyl methacrylate, polybutyl methacrylate, polycyclohexyl methacrylate, polystyrene, polyisoprene, polyhexafluoropropylene, fluorinated poly(p-xylene), fluorinated polysiloxane, fluorinated polyimide, and fluorinated polyamide.

8. The display panel according to claim 3, characterized in that, The substrate is a TFT array backplane, the anode is disposed on the TFT array backplane, and the anode is connected to the drain of the TFT array backplane.

9. The display panel according to any one of claims 3 to 8, characterized in that, The display panel further includes a planarization layer and / or an encapsulation layer, wherein the planarization layer is disposed between the light-emitting module and the brightness adjustment device, and the encapsulation layer is disposed on the brightness adjustment device; The material of the planarization layer is selected from at least one of transparent polyimide, polymethyl methacrylate, polybutyl methacrylate, polycyclohexyl methacrylate, polystyrene, polyethylene, polypropylene, polyhexafluoropropylene, polyethylene terephthalate, and polyethylene naphthalate; and / or, The encapsulation layer is an alternating stacked structure of inorganic / organic / inorganic materials. The organic materials are selected from at least one of epoxy resins, phenolic resins, polyesters, and organosilicon resins. The inorganic materials are selected from at least one of silicon oxide, aluminum oxide, zinc oxide, magnesium oxide, titanium oxide, zirconium oxide, silicon nitride, and aluminum nitride.

10. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 9.

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