Display device

Abstract

The invention relates to a display device, the display device is provided with a plurality of pixel areas distributed in an array mode and comprises a porous film layer and a quantum dot material, and the porous film layer comprises first porous units and second porous units located in the pixel areas; the first porous unit is provided with a plurality of first pore channels, and the second porous unit is provided with a plurality of second pore channels; the quantum dot material comprises a first quantum dot material filled in the first pore channel and a second quantum dot material filled in the second pore channel; the first quantum dot material and the second quantum dot material are different in light emitting color; under the same current density, the optical power of the first quantum dot material is smaller than that of the second quantum dot material, and in the same pixel area, the orthographic projection area of the first porous unit in the thickness direction of the display device is larger than that of the second porous unit in the thickness direction of the display device. The service life of the quantum dot material can be prolonged, and the display effect of the display device can be improved.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display device. Background Art

[0002] Quantum dots (QD) are nanoscale semiconductor materials with quantum fluorescence effects. Under electrical or optical excitation, they can emit fluorescence of different colors, and have a series of unique optical properties such as adjustable spectra with size, narrow half-width of emission peaks, large Stokes shift, and high excitation efficiency. When applied as structures such as color films or light-emitting layers in display panels, they can endow displays with a wider color gamut.

[0003] However, due to their small size and large surface energy, quantum dot materials are prone to agglomeration, which usually occurs during the preparation or application of quantum dots. Due to the interaction between quantum dots, they aggregate together to form larger particles or agglomerates, thereby affecting the quantum effect of quantum dot materials and reducing their luminous efficiency. Secondly, the optical powers of quantum dot materials of different colors are different, resulting in different luminous efficiencies of different pixels, thus affecting the display effect. Summary of the Invention

[0004] Embodiments of this application provide a display device, which can effectively protect quantum dot materials, avoid the agglomeration of quantum dot materials, thereby extending the service life of quantum dot materials. Moreover, it can improve the luminous efficiency of the first quantum dot material with a lower optical power, making the display brightness of the first quantum dot material and the second quantum dot material more balanced during the light-emitting process, thereby improving the display effect of the display device.

[0005] To achieve the above object, this application provides a display device, which has a plurality of pixel regions distributed in an array. The display device includes:

[0006] A porous film layer, including at least one first porous unit and at least one second porous unit located in the pixel region; the first porous unit is provided with a plurality of first pores, and the second porous unit is provided with a plurality of second pores;

[0007] Quantum dot materials, including a first quantum dot material filled in the first pores and a second quantum dot material filled in the second pores; the first quantum dot material and the second quantum dot material are configured to emit light through the first pores and the second pores and have different light-emitting colors;

[0008] Among them, at the same current density, the optical power of the first quantum dot material is less than that of the second quantum dot material, and in the same pixel region, the orthographic projection area of the first porous unit in the thickness direction of the display device is greater than that of the second porous unit in the thickness direction of the display device.

[0009] In some embodiments, in the same pixel region, the ratio between the orthographic projection area of the first porous unit in the thickness direction of the display device and the orthographic projection area of the second porous unit in the thickness direction of the display device is greater than or equal to 1.5:1 and less than or equal to 3:1.

[0010] In some embodiments, in the same first porous unit, the pore diameter of the first pore channel is greater than that of the second pore channel.

[0011] In some embodiments, the first porous unit is further provided with a plurality of third pore channels filled with the first quantum dot material. The third pore channels are provided between at least two adjacent first pore channels, and both ends of the third pore channels are respectively communicated with two adjacent first pore channels.

[0012] In some embodiments, the first pore channel includes a main pore channel disposed near the light-emitting side of the display device and a plurality of branch pore channels located on the side of the main pore channel away from the light-emitting side. The branch pore channels are communicated with the main pore channel; the included angle between the extending direction of the main pore channel and the extending direction of the branch pore channels is greater than or equal to 0° and less than 90°.

[0013] In some embodiments, each pixel region includes two first sub-pixel regions, a second sub-pixel region, and a third sub-pixel region; each first sub-pixel region is provided with one first porous unit, and the second sub-pixel region is provided with one second porous unit; the areas of the second sub-pixel region and the third sub-pixel region are both smaller than the sum of the areas of the two first sub-pixel regions;

[0014] The display device further includes a light-emitting unit located in the third sub-pixel region, and the light-emitting colors of the light-emitting unit, the first quantum dot material, and the second quantum dot material are different from each other.

[0015] In some embodiments, a plurality of the pixel regions are arranged in multiple rows and multiple columns in a first direction and a second direction, and the first direction and the second direction are perpendicularly arranged;

[0016] In the same pixel region, the second sub-pixel region and one of the first sub-pixel regions are adjacent to each other in the first direction, the second sub-pixel region and the other first sub-pixel region are adjacent to each other in the second direction, the third sub-pixel region and one of the first sub-pixel regions are adjacent to each other in the first direction, and the third sub-pixel region and the other first sub-pixel region are adjacent to each other in the second direction;

[0017] Alternatively, in the same pixel region, the second sub-pixel region and the third sub-pixel region are adjacent to each other in the first direction, the two first sub-pixel regions are adjacent to each other in the first direction, one of the first sub-pixel regions is adjacent to the second sub-pixel region in the second direction, and the other first sub-pixel is adjacent to the third sub-pixel region in the second direction.

[0018] In some embodiments, the display device further includes an array substrate and a plurality of the light-emitting units disposed on the array substrate, and the light-emitting units are located between the array substrate and the porous film layer;

[0019] The light-emitting units are configured to emit light of a first color, the first quantum dot material and the second quantum dot material are configured to respectively emit light of a second color and a third color under the irradiation of the light of the first color, and the first color, the second color, and the third color are different from each other.

[0020] In some embodiments, the display device further includes an array substrate and a first electrode layer and a second electrode layer disposed on opposite sides of the porous film layer; the first electrode layer is located between the array substrate and the porous film layer and is electrically connected to the array substrate, and the second electrode layer is located on a side of the porous film layer facing away from the first electrode layer;

[0021] The first electrode layer includes a first pixel electrode and a second pixel electrode disposed in one-to-one correspondence with the first porous unit and the second porous unit.

[0022] In some embodiments, the first quantum dot material emits green light, and the second quantum dot material emits red light or blue light.

[0023] In the display device according to the embodiment of the present application, by filling the quantum dot material in the pores of the porous film layer, the quantum dot material can be effectively protected, avoiding the agglomeration of the quantum dot material, improving the water resistance and photothermal stability of the quantum dot material, and extending the service life of the quantum dot material. Since the porous film layer filled with the quantum dot material is applied to the display device, a display effect with high color gamut, high brightness and low power consumption can be achieved, and the cost of the display device can be greatly reduced, as well as the yield of the display device can be improved. Moreover, the first quantum dot material and the second quantum dot material with different optical powers under the same current density are respectively filled in the first porous unit and the second porous unit of the porous film layer, and in the same pixel region, the orthographic projection area of the first porous unit in the thickness direction of the display device is larger than the orthographic projection area of the second porous unit in the thickness direction of the display device, so that the distribution area of the first quantum dot material in the same pixel region is larger than that of the second quantum dot material, which is beneficial to improving the luminous efficiency or light conversion efficiency of the first quantum dot material, making the display brightness of the first quantum dot material and the second quantum dot material more balanced during the light emission process, thereby improving the display effect of the display device.

[0024] Other features and advantages of the present application will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative efforts.

[0026] In order to more completely understand the present application and its beneficial effects, the following description will be made in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0027] Figure 1 is a schematic structural diagram of a display device provided by an embodiment of the present application;

[0028] Figure 2 is a schematic structural diagram of another display device provided by an embodiment of the present application;

[0029] Figure 3 is a schematic structural diagram of another display device provided by an embodiment of the present application;

[0030] Figure 4 is a schematic structural diagram of another display device provided by an embodiment of the present application;

[0031] Figure 5It is a schematic three-dimensional structure diagram of a first porous unit provided by an embodiment of the present application;

[0032] Figure 6 is Figure 5 A schematic three-dimensional structure diagram of the first pore and the third pore in the first porous unit shown;

[0033] Figure 7 It is another schematic three-dimensional structure diagram of the first pore and the third pore provided by an embodiment of the present application;

[0034] Figure 8 It is a schematic diagram of pixel arrangement of a display device provided by an embodiment of the present application;

[0035] Figure 9 It is another schematic diagram of pixel arrangement of a display device provided by an embodiment of the present application.

[0036] Explanation of reference numerals: 1(1’), display device; 2, pixel region; 2a, first sub-pixel region; 2b, second sub-pixel region; 2c, third sub-pixel region; 3, porous film layer; 4, quantum dot material; 4a, first quantum dot material; 4b, second quantum dot material; 4c, third quantum dot material; 5, first porous unit; 5a, first pore; 51a, main pore; 51b, branch pore; 5b, third pore; 6, second porous unit; 6a, second pore; 7, retaining wall; 8, light-emitting unit; 9, third porous structure; 10, array substrate; 11, functional electrode layer; 11a, first functional electrode; 11b, second functional electrode; 12, substrate; 13, first electrode layer; 13a, first pixel electrode; 13b, second pixel electrode; 13c, third pixel electrode; 14, second electrode layer; 15, dielectric layer; X, first direction; Y, second direction; Z, thickness direction. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0038] When used as a luminescent material, quantum dots have the advantages of high color purity, high luminescence quantum efficiency, tunable emission color, and long service life, making them a research hotspot for novel light-emitting diode (LED) luminescent materials. Therefore, quantum dot light-emitting diodes (QLEDs) with quantum dot materials as the light-emitting layer have become the main research direction for novel display devices currently.

[0039] Quantum dots can be excited to emit light by an electric field or light irradiation. The mechanism of exciting quantum dots to emit light by an electric field is as follows: Under the action of an electric field, in devices such as quantum dot light-emitting diodes (QLEDs), the electrodes inject electrons and holes into the quantum dot layer respectively; electrons are injected from the cathode, and holes are injected from the anode; these injected carriers meet and recombine inside the quantum dots. During the recombination process, electrons transition from high energy levels to low energy levels, and the excess energy is released in the form of photons, thus achieving luminescence. The mechanism of exciting quantum dots to emit light by light irradiation is as follows: When quantum dots are irradiated with light whose photon energy is greater than their bandgap width, the quantum dots absorb the photon energy, and the electrons inside them transition from the valence band to the conduction band, leaving holes in the valence band, forming electron-hole pairs; subsequently, the electrons transition back from the conduction band to the valence band and recombine with the holes, releasing photons, generating fluorescence or phosphorescence, and achieving luminescence.

[0040] However, due to their small size and large surface energy, quantum dot materials are prone to agglomeration, and the agglomeration phenomenon usually occurs during the preparation or application of quantum dots. Due to the interaction between quantum dots, they aggregate together to form larger particles or agglomerates, thus affecting the quantum effect of quantum dot materials and resulting in a decrease in their luminescence efficiency or light conversion efficiency. Secondly, the optical powers of different quantum dot materials are different at different current densities, resulting in differences in the luminescence efficiencies of different pixel points based on quantum dot materials, thus affecting the display effect.

[0041] To solve the above problems, the present application provides a display device. Filling the quantum dot materials in a porous structure can effectively protect the quantum dot materials, improve their water resistance and photothermal stability, and can also extend the service life; meanwhile, in the display field, filling quantum dots in a porous structure can also achieve a display effect with high color gamut, high brightness, and low power consumption, thereby greatly reducing the display cost and improving the product yield. In addition, for quantum dot materials with relatively low optical power under the same current density, the present application effectively improves the luminescence efficiency or light conversion efficiency of the pixel points corresponding to the quantum dot materials by increasing the distribution range of the quantum dot materials, adopting a specific pixel distribution, and adopting a differentiated porous structure, thereby improving the display effect of the display device. Specifically, refer to the descriptions of the following several embodiments.

[0042] Such asFigures 1 to 3 As shown in the figure, an embodiment of the present application provides a display device 1, and the display device 1 has a plurality of pixel regions 2 distributed in an array. The display device 1 includes a porous film layer 3 and a quantum dot material 4. The porous film layer 3 includes at least one first porous unit 5 and at least one second porous unit 6 located in the pixel region 2. The first porous unit 5 is provided with a plurality of first channels 5a, and the second porous unit 6 is provided with a plurality of second channels 6a. The quantum dot material 4 includes a first quantum dot material 4a filled in the first channels 5a and a second quantum dot material 4b filled in the second channels 6a, and the first quantum dot material 4a and the second quantum dot material 4b are configured to emit light through the first channels 5a and the second channels 6a and have different emission colors.

[0043] Among them, under the same current density, the optical power of the first quantum dot material 4a is less than that of the second quantum dot material 4b, and in the same pixel region 2, the orthographic projection area of the first porous unit 5 in the thickness direction Z of the display device 1 is larger than the orthographic projection area of the second porous unit 6 in the thickness direction Z of the display device 1.

[0044] It should be noted that the optical power described in the embodiments of the present application refers to the work done by light per unit time, and the unit of optical power is milliwatt (mw) and decibel milliwatt (dbm). The optical power in the embodiments of the present application refers to the optical power measured in the range of 400 nm - 700 nm using an integrating sphere under the condition of a current density of 20 mA / cm 2 and an ambient temperature of 25°C. Appropriately increasing the optical power can increase the recombination probability of electron-hole pairs inside the luminescent material, so that more energy is emitted in the form of photons, and the luminous efficiency is improved.

[0045] It can be understood that at least one first porous unit 5 and at least one second porous unit 6 are distributed in each pixel region 2. The region where each first porous unit 5 is located is a sub-pixel region, and the region where each second porous unit 6 is located is another sub-pixel region. Each sub-pixel region can be used as a pixel point.

[0046] In some embodiments, the first quantum dot material 4a emits green light, and the second quantum dot material 4b emits red light or blue light, but is not limited thereto.

[0047] After research, it is found that the reasons for quantum dot aggregation include the electrostatic interaction and van der Waals force between quantum dots, as well as improper operation or inappropriate conditions during the preparation process. In order to inhibit quantum dot aggregation, the embodiments of the present application avoid quantum dot aggregation by filling the quantum dot material 4 in the channels of the porous film layer 3, thereby playing a protective role for the quantum dot material 4.

[0048] In some embodiments, the process of filling porous materials with quantum dots includes a precursor reaction and a high-temperature treatment. For example, first, through a specific chemical reaction (such as an acetal reaction), metal ions (such as Zn2+) in the reactants are released. The metal ions coordinate with the templating agent to form a precursor material of an organic coordination structure containing metal ions. Then, the precursor material of the organic coordination structure is calcined at a high temperature. During the high-temperature calcination, the metal-ion-containing functional groups generate metal oxides (such as ZnO), which are then reduced and sublimated, leaving a porous structure and a residual trace amount of quantum dot material to form a composite material.

[0049] In other embodiments, the porous film layer 3 can be prepared by any one of photolithography techniques, etching techniques, and porous film deposition techniques.

[0050] Specifically, photolithography is a comprehensive technique that combines image copying and etching. First, by means of photographic copying, the pattern of the photolithography mask is accurately copied onto the photoresist (photolithographic resist) coated on the surface of a substrate (such as a dielectric thin layer of polysilicon, silicon nitride, silicon dioxide, etc.). Then, under the protection of the photoresist, the material to be etched is selectively etched, so that the required pattern can be obtained on the material to be etched. Therefore, the required porous film layer 3 can be formed on the substrate after cleaning treatment using the photolithography process.

[0051] Etching techniques remove the unnecessary parts on the substrate by physical or chemical methods to form the required porous film layer 3. According to the process, etching can be divided into dry etching and wet etching. For example, micron- or nano-scale holes are formed on the substrate after cleaning treatment through dry etching or wet etching processes, thereby forming the porous film layer 3. Among them, dry etching mainly uses plasma or high-energy ion beams to physically or chemically react with the material surface, thereby removing the material to form the porous film layer 3. This method is suitable for the manufacture of porous structures that require high precision and vertical sidewalls. Wet etching uses a corrosive solution to chemically react with the material, thereby removing the material to form the porous film layer 3. Wet etching is usually used in application scenarios that require the manufacture of larger-sized holes or a higher etching rate.

[0052] Specifically, the porous film layer 3 can also be formed by depositing a thin film material with a porous structure (such as SiO2 or TiO2) on the substrate after cleaning treatment. These materials can be deposited on the substrate through Chemical Vapor Deposition (CVD), Physical Vapor Deposition (PVD), or other thin film deposition techniques. During the deposition process, by controlling the deposition conditions (such as temperature, pressure, gas flow rate, etc.) and subsequent processing steps (such as heat treatment, etching, etc.), a porous film layer 3 with good porosity can be formed.

[0053] In some embodiments, the included angle between the extending direction of any one of the first channel 5a and the second channel 6a and the thickness direction Z of the display device 1 is greater than or equal to 0° and less than 90°.

[0054] In some embodiments, the material of the porous film layer 3 is selected from any one or more of polysilicon, silicon nitride, silicon dioxide, and titanium dioxide. It can be understood that the material of the porous film layer 3 is selected according to the preparation method of the porous film layer 3.

[0055] In some embodiments, the quantum dot material 4 can be synthesized as needed. The quantum dot material 4 includes CdSe, PbS, etc., but is not limited thereto.

[0056] In some embodiments, the filling process of the quantum dot material 4 includes: dispersing the synthesized quantum dots in an appropriate solvent to form a uniform colloidal solution; filling the quantum dot solution into the porous film layer 3 by methods such as dip coating, spraying, or spin coating; drying and heat treating the filled sample to cure the quantum dots.

[0057] In some embodiments, a retaining wall 7 is provided between the first porous unit 5 and the second porous unit 6. The material of the retaining wall 7 includes aluminum metal, but is not limited thereto.

[0058] In the embodiments of the present application, by filling the quantum dot material 4 in the channels of the porous film layer 3, the quantum dot material 4 can be effectively protected, avoiding the agglomeration phenomenon of the quantum dot material 4, improving the water resistance and light and heat stability of the quantum dot material 4, and extending the service life of the quantum dot material 4. Since the porous film layer 3 filled with the quantum dot material 4 is applied to the display device 1, a display effect with high color gamut, high brightness, and low power consumption can be achieved, and the cost of the display device 1 can be greatly reduced, as well as the yield of the display device 1 can be improved. Moreover, the first quantum dot material 4a and the second quantum dot material 4b with different optical powers under the same current density are respectively filled in the first porous unit 5 and the second porous unit 6 of the porous film layer 3, and in the same pixel region 2, the orthographic projection area of the first porous unit 5 in the thickness direction Z of the display device 1 is larger than the orthographic projection area of the second porous unit 6 in the thickness direction Z of the display device 1, so that the distribution area of the first quantum dot material 4a in the same pixel region 2 is larger than the distribution area of the second quantum dot material 4b, which is beneficial to improving the light emitting efficiency or light conversion efficiency of the first quantum dot material 4a, making the display brightness of the first quantum dot material 4a and the second quantum dot material 4b more balanced during the light emitting process, thereby improving the display effect of the display device 1.

[0059] In some embodiments, in the same pixel region 2, the ratio of the orthographic projection area of the first porous unit 5 in the thickness direction Z of the display device 1 to the orthographic projection area of the second porous unit 6 in the thickness direction Z of the display device 1 is greater than or equal to 1.5:1 and less than or equal to 3:1.

[0060] It should be noted that in the embodiments of the present application, the orthographic projection area of the first porous unit 5 in the same pixel region 2 in the thickness direction Z of the display device 1 refers to the total area of the orthographic projections of all the first porous units 5 in the same pixel region 2 in the thickness direction Z of the display device 1, and the orthographic projection area of the second porous unit 6 in the same pixel region 2 in the thickness direction Z of the display device 1 refers to the total area of the orthographic projections of all the second porous units 6 in the same pixel region 2 in the thickness direction Z of the display device 1.

[0061] When the ratio between the total coverage area of the first porous units 5 filled with the first quantum dot material 4a and the total coverage area of the second porous units 6 filled with the second quantum dot material 4b is too small, the improvement effect on the luminous efficiency of the first quantum dot material 4a with lower optical power is insufficient, resulting in the display brightness not being able to match the luminous brightness of other quantum dot materials with higher optical power, thus unable to effectively improve the display effect. When the ratio between the total coverage area of the first porous units 5 filled with the first quantum dot material 4a and the total coverage area of the second porous units 6 filled with the second quantum dot material 4b is too small, the improvement effect on the luminous efficiency of the first quantum dot material 4a with lower optical power is excessive, resulting in its display brightness being greater than the luminous brightness of other quantum dot materials with higher optical power, thus bringing a new problem of uneven display brightness. Through research, it is found that when the ratio between the total coverage area of the first porous units 5 filled with the first quantum dot material 4a and the total coverage area of the second porous units 6 filled with the second quantum dot material 4b in the same pixel region 2 is controlled within the range of 1.5:1 to 3:1, the problem of uneven display caused by uneven optical power of the quantum dot material 4 can be effectively improved.

[0062] In a specific embodiment, in the same pixel region 2, the ratio of the orthographic projection area of the first porous unit 5 in the thickness direction Z of the display device 1 to the orthographic projection area of the second porous unit 6 in the thickness direction Z of the display device 1 is 1.5:1, 2:1, 2.5:1 or 3:1.

[0063] In some embodiments, as Figure 1 shown, in the same first porous unit 5, a plurality of first channels 5a are arranged in an array. In the same second porous unit 6, a plurality of second channels 6a are arranged in an array.

[0064] In a specific embodiment, the extending directions of the first channel 5a and the second channel 6a are the same.

[0065] In some embodiments, the aperture diameter of the first channel 5a is larger than that of the second channel 6a.

[0066] On the one hand, the first channel 5a with a larger aperture diameter provides more sufficient space for the first quantum dot material 4a, enabling it to be more evenly dispersed in the first porous unit 5, which helps to reduce the agglomeration phenomenon between quantum dots, avoid fluorescence quenching caused by agglomeration, and thus is beneficial to improving the light emission efficiency or light conversion efficiency of the first quantum dot material 4a. Moreover, the first channel 5a with a larger aperture diameter can accommodate more of the first quantum dot material 4a. Since quantum dots are the core substances for light emission, more quantum dots will have more light emission centers under excitation conditions, thereby generating a higher optical power.

[0067] On the other hand, the first channel 5a with a larger aperture diameter is conducive to more efficient transmission of electrons and holes between the first quantum dot material 4a and the surrounding environment, making the charge transmission path smoother, reducing the hindrance of charge transmission, lowering the energy loss during charge transmission, and enabling more electrons and holes to participate in the light emission process, which is thus beneficial to improving the light emission efficiency or light conversion efficiency of the first quantum dot material 4a, and further increasing the optical power of the first quantum dot material 4a.

[0068] On the other hand, when the quantum dot material emits light, certain heat will be generated. The first channel 5a with a larger aperture diameter has better heat dissipation performance, which helps to maintain the first quantum dot material 4a working at a lower temperature, enabling it to maintain a higher light emission efficiency and stability, and thus increasing the optical power of the first quantum dot material 4a.

[0069] On the other hand, when the quantum dot material emits light through the excitation of an excitation light source, the first channel 5a with a larger aperture diameter can make the excitation light more easily enter the first porous unit 5, increasing the interaction between the excitation light and the first quantum dot material 4a. Moreover, the excitation light can be reflected and scattered more times within the first channel 5a with a larger aperture diameter, increasing the propagation distance of the excitation light within the first porous unit 5, thereby improving the absorption efficiency of the first quantum dot material 4a for the excitation light, and further increasing the optical power of the first quantum dot material 4a.

[0070] For example, when multiple first channels 5a are in a honeycomb shape and have a large aperture, the filling amount of quantum dots can be increased by 30%, and the light reflection of the pore walls can enhance the secondary excitation efficiency, which is beneficial to improving the light emission efficiency or light conversion efficiency of the first quantum dot material 4a.

[0071] Therefore, in the embodiments of the present application, the channels of the first porous unit 5 and the second porous unit 6 are designed differently, which can improve the luminescence efficiency or light conversion efficiency of the first quantum dot material 4a, and make the display brightness of the sub-pixel region where the first quantum dot material 4a is located and the sub-pixel region where the second quantum dot material 4b is located balanced, thereby facilitating the improvement of the display effect of the display device 1.

[0072] In some embodiments, the aperture of the first channel 5a is 10% to 100% larger than the aperture of the second channel 6a.

[0073] In a preferred embodiment, the aperture of the first channel 5a is 20% to 50% larger than the aperture of the second channel 6a.

[0074] For example, the aperture of the first channel 5a is 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or 100% larger than the aperture of the second channel 6a, but not limited thereto.

[0075] In a specific embodiment, the angle between the extending direction of any one of the first channel 5a and the second channel 6a and the thickness direction Z of the display device 1 is equal to 0°. That is to say, the channels in the first porous unit 5 and the second porous unit 6 are both vertically oriented channels, that is, the extending directions of the first channel 5a and the second channel 6a are the same as the thickness direction Z of the display device 1. Since the vertically oriented channels can reduce the tortuosity of the carrier transport path, it is beneficial to shorten the electron-hole separation time, thereby facilitating the improvement of the luminescence efficiency or light conversion efficiency of the quantum dot material 4.

[0076] Of course, in other specific embodiments, the multiple first channels 5a and the multiple second channels 6a can be channels arranged disorderly, and the aperture of the first channel 5a is larger than the aperture of the second channel 6a. This design can also improve the light conversion efficiency of the first quantum dot material 4a to a certain extent.

[0077] In some other embodiments, as Figure 5 and Figure 6 shown, in the same first porous unit 5, the multiple first channels 5a are arranged in an array. In the same second porous unit 6, the multiple second channels 6a are arranged in an array. The extending directions of the first channel 5a and the second channel 6a are the same. The first porous unit 5 is further provided with multiple third channels 5b filled with the first quantum dot material 4a. There is a third channel 5b between at least two adjacent first channels 5a, and both ends of the third channel 5b are respectively communicated with two adjacent first channels 5a.

[0078] In some embodiments, the included angle between the extending direction of the third channel 5b and the thickness direction Z of the display device 1 is greater than 0° and less than or equal to 90°.

[0079] In a specific embodiment, any two adjacent first channels 5a in the first porous unit 5 are interconnected through at least one third channel 5b.

[0080] It can be understood that the first porous unit 5 includes the first channels 5a and the third channels 5b, while the second porous unit 6 only includes the second channels 6a. At least two adjacent first channels 5a in the first porous unit 5 are interconnected through the third channels 5b, so that the channels in the first porous unit 5 are three-dimensional interconnected channels. Compared with the second channels 6a arranged in an oriented manner, such three-dimensional interconnected channels can provide an isotropic light scattering path and can fill more quantum dot materials 4. Therefore, such three-dimensional interconnected channels can improve the light absorption density and light utilization rate. When the first quantum dot material 4a realizes color conversion and luminescence through light excitation, it is beneficial to enhance the absorption efficiency of the first quantum dot material 4a for the excitation light, thereby being beneficial to improving the light conversion efficiency. When the first quantum dot material 4a realizes luminescence through an electric field, it is beneficial to make more first quantum dot materials 4a luminesce, thereby being beneficial to improving the luminescence efficiency.

[0081] In some other embodiments, as Figure 7 shown, the first channel 5a includes a main channel 51a arranged near the light-emitting side of the display device 1 and a plurality of branch channels 51b located on the side of the main channel 51a away from the light-emitting side. The branch channels 51b are connected to the main channel 51a. The included angle between the extending direction of the main channel 51a and the extending direction of the branch channels 51b is greater than or equal to 0° and less than 90°.

[0082] Specifically, the aperture of the branch channel 51b is smaller than the aperture of the main channel 51a.

[0083] It can be understood that since the first channel 5a is composed of a main channel 51a and a plurality of branch channels 51b that are interconnected, the porosity of the first channel 5a changes in a gradient manner. For example, the porosity of the region where the main channel 51a is located is relatively low and can be used as a charge transport layer to improve the carrier mobility; while the porosity of the region where the plurality of branch channels 51b are located is relatively high (for example, greater than 80%) and can be used as a light trapping layer to extend the optical path through multiple scatterings, which is beneficial to improving the absorption efficiency and utilization efficiency of the first quantum dot material 4a for the excitation light, thereby being beneficial to improving the external quantum efficiency of the first quantum dot material 4a, and further being beneficial to improving the luminescence efficiency or light conversion efficiency.

[0084] In a specific embodiment, the branch pore channel 51b includes a main body portion and a connecting portion. The main body portion of the branch pore channel 51b has the same extending direction as the main pore channel 51a, and both are vertically oriented. The connecting portion of the branch pore channel 51b is curved and communicates with the main pore channel 51a.

[0085] Of course, in other embodiments, the porosity in the region where the first pore channel 5a is located can vary in a multi-gradient manner. For example, on the side of the branch pore channel 51b away from the main pore channel 51a, at least one lower-level branch pore channel with a smaller aperture can also be connected, so that the first pore channel 5a is distributed in a tree-root-like shape.

[0086] It can be understood that when the first pore channel 5a has a porosity distributed in a stepped manner on the basis of a three-dimensional interconnected pore channel, the second pore channel 6a can also be connected through a pore channel similar to the third pore channel 5b to form a three-dimensional interconnected pore channel. Since the pore channels in the first porous unit 5 and the second porous unit 6 are both three-dimensional interconnected pore channels, the light emission efficiency or light conversion efficiency of the first quantum dot material 4a and the second quantum dot material 4b can be improved simultaneously, increasing the overall brightness of the sub-pixel region where the first quantum dot material 4a is located and the sub-pixel region where the second quantum dot material 4b is located, which is beneficial to improving the display effect of the display device 1. At the same time, since the first pore channel 5a of the first porous unit 5 has a porosity distributed in a stepped manner, the light emission efficiency or light conversion efficiency of the first quantum dot material 4a can be further improved, making the brightness of the sub-pixel region where the first quantum dot material 4a is located and the sub-pixel region where the second quantum dot material 4b is located balanced, which is beneficial to further improving the display effect of the display device 1.

[0087] In some embodiments, the porosities of both the first pore channel 5a and the second pore channel 6a vary in a multi-gradient manner, and the number of gradient changes in the porosity of the second pore channel 6a is less than that of the first pore channel 5a. For example, the first pore channel 5a includes a first main pore channel, a plurality of first-level first branch pore channels, and a plurality of second-level first branch pore channels. Among them, the first-level branch pore channels are located between the first main pore channel and the second-level branch pore channels. Each first-level branch pore channel communicates with the main pore channel 51a, and each first-level branch pore channel communicates with at least one second-level branch pore channel. The second pore channel 6a includes a second main pore channel and a plurality of first-level second branch pore channels, and each first-level second branch pore channel communicates with the second main pore channel. That is to say, the first pore channel 5a has two levels of branch pore channels, while the second pore channel 6a only has one level of branch pore channels, so that the number of levels of the branch pore channels of the second pore channel 5a is greater than that of the second pore channel 6a, resulting in the number of gradient changes in the porosity of the second pore channel 6a being less than that of the first pore channel 5a.

[0088] Of course, when the regions of the first channel 5a and the second channel 6a have different numbers of branch channels, the specific number of branch channels of the first channel 5a and the second channel 6a is not limited in the embodiments of the present application.

[0089] Since the number of change gradients of the porosity of the second channel 6a is less than the number of change gradients of the porosity of the first channel 5a, the first porous unit 5 can further extend the optical path, thereby further improving the absorption efficiency and utilization efficiency of the first quantum dot material 4a for the excitation light, and thus more effectively improving the external quantum efficiency of the first quantum dot material 4a, and further improving the luminescence efficiency or light conversion efficiency of the first quantum dot material 4a, making the brightness of the sub-pixel region where the first quantum dot material 4a is located and the sub-pixel region where the second quantum dot material 4b is located more balanced while increasing simultaneously, which is beneficial to further improving the display effect of the display device 1.

[0090] The embodiments of the present application can not only improve the luminescence efficiency or light conversion efficiency of the first quantum dot material 4a through the differential design of the channels of the first porous unit 5 and the second porous unit 6, thereby improving the display effect of the display device 1, but also improve the light-emitting area of the first quantum dot material 4a through pixel arrangement, thereby improving the display effect of the display device 1. For specific reference, refer to the description of pixel arrangement below.

[0091] In some embodiments, such as Figure 8 and Figure 9 shown, each pixel region 2 includes two first sub-pixel regions 2a, one second sub-pixel region 2b, and one third sub-pixel region 2c. Each first sub-pixel region 2a is provided with a first porous unit 5, and the second sub-pixel region 2b is provided with a second porous unit 6. The areas of both the second sub-pixel region 2b and the third sub-pixel region 2c are smaller than the sum of the areas of the two first sub-pixel regions 2a. The display device 1 further includes a light-emitting unit 8 located in the third sub-pixel region 2c, and the light-emitting colors of the light-emitting unit 8, the first quantum dot material 4a, and the second quantum dot material 4b are different from each other.

[0092] It should be noted that the shape and size of the first sub-pixel region 2a are consistent with the shape and size of the first porous unit 5, and the shape and size of the second sub-pixel region 2b are consistent with the shape and size of the second porous unit 6.

[0093] In some embodiments, the light-emitting unit 8 includes an Organic Light-Emitting Diode (OLED) or a Light-Emitting Diode (LED), but is not limited thereto. At this time, the first quantum dot material 4a and the second quantum dot material 4b can perform color conversion luminescence under the excitation of an excitation light source, and the structures of the excitation light source and the light-emitting unit 8 can be the same or different, and the present application does not limit this.

[0094] In a specific embodiment, when the excitation light source has the same structure as the light-emitting unit 8, the light emitted by the excitation light source and the light-emitting unit 8 has the same color, and the first quantum dot material 4a and the second quantum dot material 4b emit two different colors of light under the action of the excitation light source, thereby realizing color display.

[0095] In other embodiments, such as Figure 2 As shown, the light-emitting unit 8 includes a third porous structure 9 and a third quantum dot material 4c filled in the third porous structure 9, and the light emitted by the first quantum dot material 4a, the second quantum dot material 4b, and the third quantum dot material 4c has different colors. At this time, the first quantum dot material 4a, the second quantum dot material 4b, and the third quantum dot material 4c can emit three different colors of light under the action of the excitation light source, thereby realizing color display.

[0096] In a specific embodiment, the first quantum dot material 4a emits green light, the second quantum dot material 4b emits red light, and the display unit emits blue light, but it is not limited thereto.

[0097] It should be noted that when the light-emitting unit 8 is a third porous unit filled with the third quantum dot material 4c, the structure of the third porous unit and the second porous unit 6 may be the same or different, and the pore structures of the second porous unit 6 and the third porous unit are specifically adjusted according to the difference in the optical power of the second quantum dot material 4b and the third quantum dot material 4c under the same current density.

[0098] In some embodiments, such as Figure 8 As shown, a plurality of pixel regions 2 are arranged in multiple rows and multiple columns in the first direction X and the second direction Y, and the first direction X and the second direction Y are perpendicularly arranged. In the same pixel region 2, the second sub-pixel region 2b and one of the first sub-pixel regions 2a are adjacent in the first direction X, the second sub-pixel region 2b and the other first sub-pixel region 2a are adjacent in the second direction Y, the third sub-pixel region 2c and one of the first sub-pixel regions 2a are adjacent in the first direction X, and the third sub-pixel region 2c and the other first sub-pixel region 2a are adjacent in the second direction Y.

[0099] That is to say, the two first sub-pixel regions 2a are arranged diagonally, the second sub-pixel region 2b and the third sub-pixel region 2c are arranged diagonally, the second sub-pixel region 2b is adjacent to the two first sub-pixel regions 2a in the first direction X and the second direction Y respectively, and the third sub-pixel region 2c is adjacent to the two first sub-pixel regions 2a in the first direction X and the second direction Y respectively.

[0100] In another embodiment, such as Figure 9As shown, in the same pixel region 2, the second sub-pixel region 2b and the third sub-pixel region 2c are adjacent to each other in the first direction X, and the two first sub-pixel regions 2a are adjacent to each other in the first direction X. One of the first sub-pixel regions 2a is adjacent to the second sub-pixel region 2b in the second direction Y, and the other first sub-pixel is adjacent to the third sub-pixel region 2c in the second direction Y.

[0101] In a specific embodiment, the first sub-pixel region 2a is configured to emit green light, the second sub-pixel region 2b is configured to emit red light, and the third sub-pixel region 2c is configured to emit blue light. Correspondingly, the first quantum dot material 4a is a green quantum dot material, the second quantum dot material 4b is a red quantum dot material, and the third quantum dot material 4c is a blue quantum dot material or the light-emitting unit 8 is a blue light device (such as a blue OLED or a blue LED).

[0102] That is to say, each pixel region 2 contains two green sub-pixels, one red sub-pixel, and one blue sub-pixel.

[0103] Since the optical power of the green quantum dot material 4 is lower than that of the red quantum dot material 4 under the same current density, by increasing the distribution area of the green quantum dot material 4 in the pixel region 2, it is beneficial to balance the display brightness of green light, red light, and blue light, avoid problems such as color deviation in the display, and thus improve the display effect of the display device 1. On the other hand, by increasing the proportion of green sub-pixels in the pixel region 2, the overall power consumption of the display device 1 can also be reduced, which is beneficial to reducing the display cost.

[0104] In some embodiments, the display device 1 further includes an array substrate 10 and a plurality of light-emitting units 8 disposed on the array substrate 10. The light-emitting units 8 are located between the array substrate 10 and the porous film layer 3. The light-emitting units 8 are configured to emit light of a first color, and the first quantum dot material 4a and the second quantum dot material 4b are configured to emit light of a second color and a third color respectively under the irradiation of the light of the first color, and the first color, the second color, and the third color are different from each other.

[0105] It can be understood that a light-emitting unit 8 is provided on one side of each porous unit close to the array substrate 10. The plurality of light-emitting units 8 can not only serve as the excitation light source for the quantum dot material 4 but also as the light-emitting unit 8 for the third sub-pixel region 2c.

[0106] It should be noted that the light-emitting side of the display device 1 described in the embodiments of the present application refers to the side of the porous film layer 3 facing away from the array substrate 10.

[0107] In a specific embodiment, the light of the first color is blue light, the light of the second color is green light, and the light of the third color is red light.

[0108] It can be understood that the first quantum dot material 4a emits green light under the excitation of blue light, and the second quantum dot material 4b emits red light under the excitation of blue light. Therefore, the first sub-pixel region 2a and the second sub-pixel region 2b display green and red respectively. The blue light emitted by the light-emitting unit 8 directly passes through the third sub-pixel region 2c, making the third sub-pixel region 2c display blue light.

[0109] In some embodiments, as Figure 3 shown, the display device 1 may further be provided with a functional electrode layer 11 on one side of the porous film layer 3 close to the array substrate 10 and / or on the side facing away from the array substrate 10. An electric field is provided to the quantum dot material 4 through the functional electrode layer 11 to assist in driving the quantum dot material 4 to emit light, thereby assisting in improving the light-emitting efficiency of the quantum dot material 4. For example, by providing different current densities to the first quantum dot material 4a and the second quantum dot material 4b through the functional electrode layer 11, the light conversion efficiency of the first quantum dot material 4a is improved, so that the display brightness of the first sub-pixel region 2a, the second sub-pixel region 2b, and the third sub-pixel region 2c is more balanced, and thus the display effect of the display device 1 can be improved.

[0110] In this embodiment, the functional electrode layer 11 includes a first functional electrode 11a disposed opposite to the first porous unit 5, a second functional electrode 11b disposed opposite to the second porous unit 6, and porous silica (dielectric constant ≤ 3.0) or fluorinated polymer filled between the first functional electrode 11a and the second functional electrode 11b. By filling porous silica or fluorinated polymer, the parasitic capacitance between the first functional electrode 11a and the second functional electrode 11b can be reduced, thereby reducing signal crosstalk. At the same time, the high light transmittance (> 95%) of the electrode layer can be maintained, enabling the excitation light source to efficiently pass through the electrode layer to match the light-emitting requirements of the quantum dot material 4.

[0111] In some embodiments, the display device 1 further includes a substrate 12 disposed on the side of the porous film layer 3 facing away from the array substrate 10. The material of the substrate 12 includes glass or plastic, but is not limited thereto. It can be understood that the substrate 12 plays a role in protecting the porous film layer 3.

[0112] The embodiment of the present application provides a passive light-emitting display device 1 based on a quantum dot material 4. By filling the quantum dot material 4 in the pores of the porous film layer 3, the quantum dot material 4 can be effectively protected, preventing the aggregation of the quantum dot material 4, improving the water resistance and photothermal stability of the quantum dot material 4, and extending the service life of the quantum dot material 4. Since the porous film layer 3 filled with the quantum dot material 4 is applied to the display device 1, a display effect with high color gamut, high brightness, and low power consumption can be achieved, and the cost of the display device 1 can be greatly reduced, as well as the yield of the display device 1 can be improved. Moreover, the first quantum dot material 4a and the second quantum dot material 4b with different optical powers under the same current density are respectively filled in the first porous unit 5 and the second porous unit 6 of the porous film layer 3. By differentially designing the coverage area and pore structure of the first porous unit 5 and the second porous unit 6, and combined with the pixel arrangement, the light-emitting efficiency or light conversion efficiency of the first quantum dot material 4a in the first porous unit 5 is effectively improved, making the display brightness of the sub-pixel region where the first quantum dot material 4a is located and the sub-pixel region where the second quantum dot material 4b is located balanced, thereby effectively improving the display effect of the display device 1.

[0113] As Figure 4 shown, the embodiment of the present application further provides a display device 1'. Different from the foregoing embodiment, the display device 1' further includes an array substrate 10 and a first electrode layer 13 and a second electrode layer 14 disposed on opposite sides of the porous film layer 3; the first electrode layer 13 is located between the array substrate 10 and the porous film layer 3 and is electrically connected to the array substrate 10, and the second electrode layer 14 is located on the side of the porous film layer 3 away from the first electrode layer 13. The first electrode layer 13 includes a first pixel electrode 13a and a second pixel electrode 13b that are disposed in one-to-one correspondence with the first porous unit 5 and the second porous unit 6. That is to say, the quantum dot material 4 in the embodiment of the present application emits light under the action of the electric field provided by the first electrode layer 13 and the second electrode layer 14.

[0114] In some embodiments, the display device 1' is a QLED display device.

[0115] In some embodiments, the edge of the first porous unit 5 is aligned with the edge of the first pixel electrode 13a, and the edge of the second porous unit 6 is aligned with the edge of the second pixel electrode 13b.

[0116] It can be understood that the shape and size of the first pixel electrode 13a are consistent with the shape and size of the first porous unit 5, and the shape and size of the second pixel electrode 13b are consistent with the shape of the second porous unit 6.

[0117] If the edges of the pixel electrode and the porous unit are not aligned, it may cause uneven excitation of the quantum dot material under the action of the electric field. For example, in the area where the pixel electrode is not fully covered, the quantum dot material cannot be fully excited to emit light, resulting in dark emission areas, which affects the uniformity of the display screen. Therefore, the smaller the alignment deviation between the edge of the pixel electrode and the corresponding porous unit, the more conducive it is to improving the emission uniformity of the quantum dot material in the porous unit.

[0118] It should be noted that during the actual production process, due to certain deviations in manufacturing precision, there is a certain alignment deviation between the edge of the first pixel electrode 13a and the edge of the corresponding first porous unit 5, and there is also a certain alignment deviation between the edge of the second pixel electrode 13b and the edge of the corresponding second porous unit 6. For example, the alignment deviation refers to the distance between the positive projections of the edges on the same side of the pixel electrode and the corresponding porous unit in the thickness direction of the display device.

[0119] In some embodiments, the alignment deviation between the edge of the first pixel electrode 13a and the edge of the corresponding first porous unit 5 is limited within the range of ±10%.

[0120] For high-resolution QLED display devices, due to the small pixel size, higher alignment precision is required between the edge of the pixel electrode and the edge of the porous unit, and the deviation between the two is controlled between 0 - 2 microns. For low-resolution QLED display devices or those with relatively low requirements for display precision, the alignment deviation between the edge of the pixel electrode and the edge of the porous unit is controlled between 3 - 5 microns.

[0121] In some embodiments, the ratio of the area of the first pixel electrode 13a to the area of the second pixel electrode 13b is greater than or equal to 1.5:1 and less than or equal to 3:1.

[0122] In some embodiments, the edges of the first pixel electrode 13a and the second pixel electrode 13b are rounded or ramp-shaped. By increasing the curvature radius of the pixel electrode, improving the edge of the pixel electrode, or giving the pixel electrode an optimal shape, the resistance can be effectively reduced, which helps the current to pass through the electrode more smoothly, thereby reducing the attenuation of the electrical signal, and further facilitating the improvement of the light conversion efficiency of the quantum dot material 4. For example, introducing a 50nm to 100nm arc chamfer or taper treatment at the edges of the first pixel electrode 13a and the second pixel electrode 13b to reduce the electric field peak effect, this design can reduce the edge capacitance of the first pixel electrode 13a and the second pixel electrode 13b by 10 - 15%, and suppress the signal jitter caused by electromagnetic interference, which is beneficial to improving the light emission efficiency of the quantum dot material 4.

[0123] In some embodiments, the light-emitting unit 8 includes a third porous unit and a third quantum dot material 4c filled in the third porous unit, and the lights emitted by the first quantum dot material 4a, the second quantum dot material 4b, and the third quantum dot material 4c have different colors. At this time, the first quantum dot material 4a, the second quantum dot material 4b, and the third quantum dot material 4c can emit three different colors of light under the action of an electric field, thereby realizing color display.

[0124] In some embodiments, the first electrode layer 13 further includes a third pixel electrode 13c disposed opposite to the third porous unit, and the edge of the third porous unit is aligned with the edge of the third pixel electrode 13c.

[0125] In some embodiments, the ratio between the areas of the first pixel electrode 13a and the third pixel electrode 13c is greater than or equal to 1.5:1 and less than or equal to 3:1.

[0126] In a specific embodiment, the first quantum dot material 4a emits green light, the second quantum dot material 4b emits red light, and the third quantum dot material 4c emits blue light, but is not limited thereto.

[0127] In some embodiments, the materials of the first pixel electrode 13a and the second pixel electrode 13b are selected from at least one of indium tin oxide (ITO), silver, and gold.

[0128] In some embodiments, the first pixel electrode 13a and the second pixel electrode 13b are formed by an electrode material deposition and an electrode material patterning process. For example, first, the electrode material is deposited onto a specific area of the array substrate 10 by evaporation, sputtering, or printing technology, and then the deposited electrode material is patterned using photolithography or laser etching technology to form the required electrode patterns (such as the first pixel electrode 13a and the second pixel electrode 13b) to control the energized areas of the first quantum dot material 4a and the second quantum dot material 4b.

[0129] In some embodiments, other layers, such as a protective layer, an insulating layer, etc., can be deposited on the first pixel electrode 13a and the second pixel electrode 13b as needed to further improve the performance and stability of the pixel electrodes.

[0130] In some embodiments, after obtaining the patterned first pixel electrode 13a and second pixel electrode 13b, post-treatments such as annealing and cleaning can also be performed on the first pixel electrode 13a and the second pixel electrode 13b to ensure the quality and performance of the pixel electrodes.

[0131] In some embodiments, the first pixel electrode 13a and the second pixel electrode 13b both have a Z-shaped trunk structure. The trunks of the first pixel electrode 13a and the second pixel electrode 13b are designed to be a right-angled Z-shape (width ≤ 2 μm), and the current path can be made uniform by changing the direction of the electric field distribution, so that the resistance loss caused by the local current density concentration can be reduced, and the energy loss in the signal transmission can be reduced, which is conducive to improving the luminous efficiency of the quantum dot material 4.

[0132] In other embodiments, the first pixel electrode 13a and the second pixel electrode 13b are both three-dimensional porous electrodes. For example, a through-type three-dimensional porous electrode is constructed by a template method, and the charge collection efficiency of the pixel electrode is enhanced by increasing the specific surface area, so that a parallel conductive channel is formed inside the porous film layer 3, which is conducive to shortening the charge transmission distance and reducing the interface resistance, thereby facilitating improving the luminous efficiency of the quantum dot material 4.

[0133] In some embodiments, a dielectric layer 15 is filled between the first pixel electrode 13a and the second pixel electrode 13b, such as porous silicon dioxide (dielectric constant ≤ 3.0) or fluorinated polymer. This design can reduce parasitic capacitance and thus reduce signal crosstalk.

[0134] In some embodiments, the first electrode layer 13 is an anode layer, and the second electrode layer 14 is a cathode layer, but is not limited thereto.

[0135] In some embodiments, the array substrate 10 includes a substrate layer and a driving circuit layer arranged on the substrate layer, and the first electrode layer 13 is arranged on the side of the driving circuit layer away from the substrate layer. The driving circuit layer includes a data line, a conductive film, a transistor, and a common electrode. The first pixel electrode 13a and the second pixel electrode 13b are electrically connected to the conductive film of the driving circuit layer. The data line is used to transmit a data signal, and the conductive film transmits the signal transmitted by the data line to the pixel electrode. The transistor is arranged on the conductive film, and the common electrode is connected to the transistor for leakage control. Such a structural design helps to improve the aperture ratio and light transmittance of the pixel electrode, thereby improving the display effect of the display panel.

[0136] In some embodiments, the material of the substrate layer includes glass or plastic, but is not limited thereto.

[0137] The embodiment of the present application provides an active light-emitting display device 1' based on a quantum dot material 4. By filling the quantum dot material 4 in the pores of the porous film layer 3, the quantum dot material 4 can be effectively protected, preventing the quantum dot material 4 from agglomerating, improving the water and light-thermal stability of the quantum dot material 4, and extending the service life of the quantum dot material 4. Since the porous film layer 3 filled with the quantum dot material 4 is applied in the display device 1', a display effect with high color gamut, high brightness, and low power consumption can be achieved, and the cost of the display device 1' can be greatly reduced, as well as the yield of the display device 1' can be improved. Moreover, the first quantum dot material 4a and the second quantum dot material 4b with different optical powers under the same current density are respectively filled in the first porous unit 5 and the second porous unit 6 of the porous film layer 3. By differentially designing the coverage areas and pore structures of the first porous unit 5 and the second porous unit 6, and combined with pixel arrangement, the luminous efficiency of the first quantum dot material 4a in the first porous unit 5 is effectively improved, making the display brightness of the sub-pixel region where the first quantum dot material 4a is located and the sub-pixel region where the second quantum dot material 4b is located balanced, thereby effectively improving the display effect of the display device 1'.

[0138] Of course, the porous film layer filled with the quantum dot material provided by the embodiment of the present application can also be applied to the backlight module of a liquid crystal display device. At this time, the backlight source of the backlight module emits blue light, and the porous film layer filled with the quantum dot material serves as a color conversion layer, converting the blue light into red light and green light, so that the red, green, and blue lights are mixed into white light, thereby realizing providing white backlight to the liquid crystal display panel.

[0139] It can be understood that the application of the porous film layer filled with the quantum dot material provided by the embodiment of the present application is not limited to the descriptions of the above several embodiments.

[0140] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0141] In the above embodiments, the descriptions of each embodiment have their own focuses. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0142] Among the embodiments, embodiments, and related technical features of the present application, they can be combined and replaced with each other without conflict.

[0143] The above are only the preferred embodiments of the present application, and do not impose any formal restrictions on the present application. However, any simple modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A display device, characterized in that: The display device has a plurality of pixel areas, and the display device includes: A porous membrane layer, comprising at least one first porous unit and at least one second porous unit located in the pixel area; the first porous unit is provided with a plurality of first pores, and the second porous unit is provided with a plurality of second pores; The quantum dot material includes a first quantum dot material filled in the first pore and a second quantum dot material filled in the second pore; the first quantum dot material and the second quantum dot material are configured to emit light through the first pore and the second pore with different colors of light; In which, under the same current density, the optical power of the first quantum dot material is less than the optical power of the second quantum dot material, and in the same pixel area, the orthographic projection area of ​​the first porous unit in the thickness direction of the display device is greater than the orthographic projection area of ​​the second porous unit in the thickness direction of the display device.

2. The display device according to claim 1, characterized in that In the same pixel region, a ratio between an orthographic projection area of ​​the first porous unit in the thickness direction of the display device and an orthographic projection area of ​​the second porous unit in the thickness direction of the display device is greater than or equal to 1.5:1 and less than or equal to 3:

1.

3. The display device according to claim 1, characterized in that The aperture of the first hole channel is larger than the aperture of the second hole channel.

4. The display device according to claim 1, characterized in that The first porous unit is further provided with a plurality of third channels filled with the first quantum dot material, the third channel is provided between at least two adjacent first channels, and both ends of the third channel are respectively connected with two adjacent first channels.

5. The display device according to claim 3 or 4, characterized in that: The first channel includes a main channel arranged close to the light emitting side of the display device and a plurality of branch channels located on the main channel away from the light emitting side, and the branch channels are connected to the main channel; an angle between an extension direction of the main channel and an extension direction of the branch channels is greater than or equal to 0° and less than 90°.

6. The display device according to claim 1, characterized in that: Each of the pixel regions comprises two first sub-pixel regions, one second sub-pixel region and one third sub-pixel region; each of the first sub-pixel regions is provided with one first porous unit, and each of the second sub-pixel regions is provided with one second porous unit; the areas of the second sub-pixel region and the third sub-pixel region are both smaller than the sum of the areas of the two first sub-pixel regions; The display device further includes a light emitting unit located in the third sub-pixel region, and the light emitting colors of the light emitting unit, the first quantum dot material, and the second quantum dot material are different from each other.

7. The display device according to claim 6, characterized in that: The plurality of pixel regions are arranged in a plurality of rows and columns in a first direction and a second direction, and the first direction and the second direction are arranged perpendicularly; In the same pixel region, the second sub-pixel region and one of the first sub-pixel regions are adjacently arranged in the first direction, the second sub-pixel region and another of the first sub-pixel regions are adjacently arranged in the second direction, the third sub-pixel region and one of the first sub-pixel regions are adjacently arranged in the first direction, and the third sub-pixel region and another of the first sub-pixel regions are adjacently arranged in the second direction; Alternatively, in the same pixel area, the second sub-pixel area and the third sub-pixel area are arranged adjacent to each other in the first direction, two first sub-pixel areas are arranged adjacent to each other in the first direction, one of the first sub-pixel areas is arranged adjacent to the second sub-pixel area in the second direction, and the other first sub-pixel area is arranged adjacent to the third sub-pixel area in the second direction.

8. The display device according to claim 6 or 7, characterized in that: The display device further comprises an array substrate and a plurality of light-emitting units arranged on the array substrate, wherein the light-emitting units are located between the array substrate and the porous membrane layer; The light emitting unit is configured to emit light of a first color, the first quantum dot material and the second quantum dot material are configured to emit light of a second color and light of a third color respectively under the irradiation of the first color of light, and the first color, the second color and the third color are different from each other.

9. The display device according to claim 1, characterized in that: The display device further comprises an array substrate and a first electrode layer and a second electrode layer disposed on opposite sides of the porous membrane layer; the first electrode layer is located between the array substrate and the porous membrane layer and is electrically connected to the array substrate, and the second electrode layer is located on a side of the porous membrane layer away from the first electrode layer; The first electrode layer includes a first pixel electrode and a second pixel electrode which are arranged in one-to-one correspondence with the first porous unit and the second porous unit.

10. The display device according to claim 1, characterized in that: The first quantum dot material emits green light, and the second quantum dot material emits red light or blue light.

Images