Display panel, manufacturing method thereof, and display device

Abstract

The present application discloses a display panel, a preparation method thereof, and a display device, wherein the display panel includes a light-emitting substrate; a retaining wall layer, including a plurality of annular sub-retaining walls, an annular sub-retaining wall having an opening; a color conversion layer, including a plurality of color conversion films, at least part of the openings being provided with the color conversion films; the retaining wall layer includes a plurality of first annular sub-retaining walls, a plurality of second annular sub-retaining walls, and a plurality of third annular sub-retaining walls; a first annular sub-retaining wall is arranged around a first color sub-pixel region, the first annular sub-retaining wall reflects the first color light and absorbs the second color light and the third color light; a second annular sub-retaining wall is arranged around a second color sub-pixel region, the second annular sub-retaining wall reflects the second color light and absorbs the first color light and the third color light; a third annular sub-retaining wall is arranged around a third color sub-pixel region, the third annular sub-retaining wall reflects the third color light and absorbs the first color light and the second color light.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel, a preparation method thereof, and a display device. Background Art

[0002] Quantum dot display technology has the advantages of high color gamut and wide viewing angle. Among them, the solution of quantum dot color filter with blue micro light-emitting diodes or blue organic light-emitting diodes has great advantages in brightness viewing angle, chromaticity viewing angle and color gamut. In particular, the theoretical color gamut can reach more than 95% of the BT2020 standard.

[0003] However, in actual applications, the wide viewing angle of quantum dot pixels can cause severe crosstalk, reducing the contrast and color gamut of the overall display device. To improve crosstalk, black light-absorbing barrier structures are usually placed between pixels to absorb light from adjacent pixels. Red, green, and blue barrier layers are also used above the quantum dot pixels to further improve the color gamut and prevent the impact of ambient light on display contrast. However, the black light-absorbing barrier structure absorbs light from the sides of the quantum dot layer, causing a significant drop in the brightness of the overall device, resulting in low brightness and low energy efficiency. Summary of the Invention

[0004] The present invention provides a display panel, a manufacturing method thereof, and a display device. The display panel can solve the problems of low display brightness and high power consumption.

[0005] To solve the above problems, in a first aspect, the present invention provides a display panel, comprising a plurality of first color sub-pixel regions, a plurality of second color sub-pixel regions, and a plurality of third color sub-pixel regions, the display panel comprising:

[0006] light-emitting substrate;

[0007] A retaining wall layer is provided on the light-emitting substrate and includes a plurality of adjacent annular sub-retaining walls, wherein one of the annular sub-retaining walls has an opening;

[0008] a color conversion layer, disposed on the light-emitting substrate, comprising a plurality of color conversion films, wherein the color conversion films are disposed in at least a portion of the openings;

[0009] The plurality of annular sub-retaining walls include a plurality of first annular sub-retaining walls, a plurality of second annular sub-retaining walls and a plurality of third annular sub-retaining walls;

[0010] A first annular sub-blocking wall is disposed around a first color sub-pixel region, and the first annular sub-blocking wall reflects the first color light and absorbs the second color light and the third color light;

[0011] A second annular sub-blocking wall is disposed around a second color sub-pixel region, and the second annular sub-blocking wall reflects the second color light and absorbs the first color light and the third color light.

[0012] The third annular sub-blocking wall is disposed around the third color sub-pixel region, and the third annular sub-blocking wall reflects the third color light and absorbs the first color light and the second color light.

[0013] In the display panel provided by an embodiment of the present invention, the first annular sub-blocking wall includes a first photonic crystal, the second annular sub-blocking wall includes a second photonic crystal, and the third annular sub-blocking wall includes a third photonic crystal.

[0014] In the display panel provided in one embodiment of the present invention, the first photonic crystal includes a plurality of first nanoparticles in an ordered close packing, the second photonic crystal includes a plurality of second nanoparticles in an ordered close packing, and the third photonic crystal includes a plurality of third nanoparticles in an ordered close packing.

[0015] In the display panel provided by one embodiment of the present invention, the first nanoparticles, the second nanoparticles, and the third nanoparticles have a hollow structure.

[0016] In the display panel provided by one embodiment of the present invention, the hollow diameter of the first nanoparticles is larger than the hollow diameter of the second nanoparticles, and the hollow diameter of the second nanoparticles is larger than the hollow diameter of the third nanoparticles;

[0017] The wall thickness of the first nanoparticle is equal to the wall thickness of the second nanoparticle, and the wall thickness of the second nanoparticle is equal to the wall thickness of the third nanoparticle.

[0018] In the display panel provided by an embodiment of the present invention, materials of the first nanoparticles, the second nanoparticles, and the third nanoparticles are independently selected from polystyrene, polymethyl methacrylate polycarbonate, titanium dioxide, silicon dioxide, zirconium dioxide, aluminum oxide, and gallium oxide.

[0019] In the display panel provided in one embodiment of the present invention, the first photonic crystal also includes a first photoresist resin filled in the gaps between each of the first nanoparticles, the second photonic crystal also includes a second photoresist resin filled in the gaps between each of the second nanoparticles, and the third photonic crystal also includes a third photoresist resin filled in the gaps between each of the third nanoparticles.

[0020] In a second aspect, the present invention further provides a method for manufacturing a display panel, wherein the display panel includes a plurality of first color sub-pixel regions, a plurality of second color sub-pixel regions, and a plurality of third color sub-pixel regions, and the method for manufacturing the display panel includes:

[0021] S10: providing a light-emitting substrate;

[0022] S20: forming a barrier layer on the light-emitting substrate, wherein forming the barrier layer includes forming a plurality of adjacent annular sub-barriers, wherein one of the annular sub-barriers has an opening, wherein forming the plurality of annular sub-barriers includes forming a plurality of first annular sub-barriers, a plurality of second annular sub-barriers, and a plurality of third annular sub-barriers; one of the first annular sub-barriers is arranged around a first color sub-pixel region, the first annular sub-barrier reflects the first color light and absorbs the second color light and the third color light; one of the second annular sub-barriers is arranged around a second color sub-pixel region, the second annular sub-barrier reflects the second color light and absorbs the first color light and the third color light; one of the third annular sub-barriers is arranged around a third color sub-pixel region, the third annular sub-barrier reflects the third color light and absorbs the first color light and the second color light;

[0023] S30: forming a color conversion layer on the light-emitting substrate, wherein the color conversion layer includes a plurality of color conversion films, and the color conversion films are formed in at least a portion of the openings.

[0024] In the method for manufacturing a display panel provided in one embodiment of the present invention, in S20, the step of forming a plurality of the first annular sub-retaining walls includes:

[0025] forming a first nanoparticle accumulation film, wherein the first nanoparticle accumulation film includes a plurality of first nanoparticles in an ordered and densely packed state;

[0026] forming a first photoresist resin film on the first nanoparticle accumulation film, and allowing the film to stand to obtain a first photonic crystal film;

[0027] patterning the first photonic crystal film to obtain the first annular sub-blocking wall;

[0028] The steps of forming a plurality of the second annular sub-retaining walls include:

[0029] forming a second nanoparticle stacking film, wherein the second nanoparticle stacking film includes a plurality of second nanoparticles in an ordered close-packed state;

[0030] forming a second photoresist resin film on the second nanoparticle accumulation film, and allowing the film to stand to obtain a second photonic crystal film;

[0031] patterning the second photonic crystal film to obtain the second annular sub-blocking wall;

[0032] The steps of forming a plurality of third annular sub-retaining walls include:

[0033] forming a third nanoparticle stacking film, wherein the third nanoparticle stacking film includes a plurality of third nanoparticles in an ordered and densely packed state;

[0034] forming a third photoresist resin film on the third nanoparticle accumulation film, and allowing the film to stand to obtain a third photonic crystal film;

[0035] The third photonic crystal film is patterned to obtain the third annular sub-blocking wall.

[0036] In a third aspect, the present invention provides a display device, comprising the above-mentioned display panel.

[0037] Beneficial effect: An embodiment of the present invention provides a display panel, a preparation method thereof, and a display device, by setting the barrier layer in the display panel to a structure that can selectively reflect light, specifically setting the barrier layer to include a first annular sub-barrier surrounding the first color sub-pixel area, a second annular sub-barrier surrounding the second color sub-pixel area, and a third annular sub-barrier surrounding the third color sub-pixel area, and further setting the first annular sub-barrier to selectively reflect only the first color light, the second annular sub-barrier to selectively reflect only the second color light, and the third annular sub-barrier to selectively reflect only the third color light, thereby improving the problem of light crosstalk between adjacent sub-pixels while avoiding light being absorbed and lost by the barrier layer, thereby effectively improving the display brightness of the display panel and reducing the power consumption of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 is a schematic diagram of a cross-sectional structure of a display panel provided by an embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of a planar structure of a display panel provided by an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the planar structure of a retaining wall in a display panel provided by an embodiment of the present invention;

[0042] Figure 4 This is a schematic structural diagram of a first photonic crystal included in a retaining wall of a display panel provided by an embodiment of the present invention;

[0043] Figure 5is a text flow diagram of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0044] Figures 6a-6i It is a structural flow diagram of a method for manufacturing a display panel provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0047] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to make and use the invention. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art will recognize that the invention can be practiced without these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0048] An embodiment of the present invention provides a display panel, which is combined with Figure 1-Figure 3 Provide detailed explanation.

[0049] See Figure 1 , the display panel includes a light-emitting substrate 110, a barrier layer 120 and a quantum dot color conversion layer 130;

[0050] See Figure 2 The display panel includes a plurality of spaced-apart sub-pixel areas PA and a non-pixel area NA located between adjacent sub-pixel areas PA. The plurality of sub-pixel areas PA include a plurality of first color sub-pixel areas PA1, a plurality of second color sub-pixel areas PA2, and a plurality of third color sub-pixel areas PA3. The sub-pixel areas PA are arranged in sequence according to display requirements.

[0051] The light-emitting substrate 110 includes a first substrate 111 and a plurality of light-emitting devices 112 disposed on the first substrate 111. Each light-emitting device 112 is correspondingly disposed in one sub-pixel area PA. Typically, the light-emitting substrate 110 further includes an encapsulation layer 113 disposed on each light-emitting device 112.

[0052] The barrier layer 120 is disposed on the light emitting substrate 110 and is correspondingly disposed in the non-pixel area NA. Figure 3 , comprising a plurality of annular sub-retaining walls 120a arranged adjacent to each other in sequence, wherein one of the annular sub-retaining walls 120a is arranged around a corresponding one of the sub-pixel areas PA, and one of the annular sub-retaining walls 120a has an opening A. Further, the plurality of annular sub-retaining walls 120a include a plurality of first annular sub-retaining walls 121, a plurality of second annular sub-retaining walls 122, and a plurality of third annular sub-retaining walls 123;

[0053] The first annular sub-blocking wall 121 is disposed around a corresponding first color sub-pixel area PA1, that is, the first annular sub-blocking wall 121 has a first opening A1 disposed corresponding to the first color sub-pixel area PA1;

[0054] A second annular sub-blocking wall 122 is disposed around a corresponding second color sub-pixel area PA2, that is, a second annular sub-blocking wall 122 has a second opening A2 disposed corresponding to the second color sub-pixel area PA2;

[0055] The third annular sub-blocking wall 123 is disposed around a corresponding third color sub-pixel area PA3, that is, the first annular sub-blocking wall 121 has a third opening A3 disposed corresponding to the third color sub-pixel area PA3;

[0056] The color conversion layer 130 is disposed on the light-emitting substrate 110 and correspondingly disposed in the openings A of the barrier layer 120. The color conversion layer 130 includes a plurality of color conversion films 130a. The color conversion films 130a are disposed in at least a portion of the openings A in the barrier layer 120. The color conversion films 130a are configured to receive light emitted by the corresponding light-emitting devices 112 in the light-emitting substrate 110 and convert the light into light of corresponding colors through the principle of photoluminescence, thereby achieving color display.

[0057] Furthermore, the first annular sub-blocking wall 121 reflects the first color light and absorbs the second color light and the third color light, the second annular sub-blocking wall 122 reflects the second color light and absorbs the first color light and the third color light, and the third annular sub-blocking wall 123 reflects the third color light and absorbs the first color light and the second color light.

[0058] In the display panel provided in an embodiment of the present invention, the barrier layer 120 is set to a structure that can selectively reflect light, specifically, the barrier layer 120 is set to include a first annular sub-barrier 121 surrounding the first color sub-pixel area PA1, a second annular sub-barrier 122 surrounding the second color sub-pixel area PA2, and a third annular sub-barrier 123 surrounding the third color sub-pixel area PA3, and the first annular sub-barrier 121 is further set to selectively reflect only the first color light, the second annular sub-barrier 122 is set to selectively reflect only the second color light, and the third annular sub-barrier 123 is set to selectively reflect only the third color light, thereby improving the problem of light crosstalk between adjacent sub-pixels while avoiding light being absorbed and lost by the barrier layer 120, thereby effectively improving the display brightness of the display panel and reducing the power consumption of the display panel.

[0059] In some embodiments, the first color sub-pixel region PA1 is a blue sub-pixel region, the second color sub-pixel region PA2 is a green sub-pixel region, and the third color sub-pixel region PA3 is a red sub-pixel region;

[0060] Correspondingly, the first annular sub-blocking wall 121 reflects blue light and absorbs red and green light, the second annular sub-blocking wall 122 reflects green light and absorbs blue and red light, and the third annular sub-blocking wall 123 reflects red light and absorbs green and blue light.

[0061] In some embodiments, each of the light-emitting devices 112 is a blue light-emitting device. For example, each of the light-emitting devices 112 is a blue organic light-emitting diode, or each of the light-emitting devices 112 is a blue micro light-emitting diode. Correspondingly, the color conversion layer 130 includes a plurality of red light color conversion films 131 and a plurality of green light color conversion films 132. One of the red light color conversion films 131 is arranged in the third opening A3 of the corresponding third annular sub-blocking wall 123, and one of the green light color conversion films 132 is arranged in the second opening A2 of the corresponding second annular sub-blocking wall 122.

[0062] In some embodiments, the material of the color conversion layer 130 includes a quantum dot material, the red light color conversion film 131 includes a red light quantum dot material, and the green light color conversion film 132 includes a green light quantum dot material.

[0063] In some embodiments, photonic crystals with wavelength selectivity are used as the main material of the barrier layer 120 to selectively reflect light of corresponding wavelength bands.

[0064] Specifically, the first annular sub-blocking wall 121 includes a first photonic crystal, and the structure of the first photonic crystal is correspondingly designed so that the first photonic crystal can reflect the first color light and absorb the second color light and the third color light;

[0065] The second annular sub-blocking wall includes a second photonic crystal, and the structure of the second photonic crystal is correspondingly designed so that the second photonic crystal can reflect the second color light and absorb the first color light and the third color light;

[0066] The third annular sub-blocking wall includes a third photonic crystal, and by correspondingly designing the structure of the third photonic crystal, the third photonic crystal can reflect the first color light and absorb the second color light and the third color light.

[0067] The photonic crystal described in the embodiments of the present invention is a structure formed by arranging two materials with different dielectric constants in a spatially periodic arrangement. This spatially periodic arrangement of dielectric constants gives the photonic crystal a photonic band gap. When the frequency of light falls within the photonic band gap, the light cannot propagate through the photonic crystal, resulting in selective light reflection.

[0068] In some embodiments, the first photonic crystal includes a plurality of first nanoparticles in an ordered close packing, the second photonic crystal includes a plurality of second nanoparticles in an ordered close packing, and the third photonic crystal includes a plurality of third nanoparticles in an ordered close packing. For example, the microstructure of the first photonic crystal can be referred to Figure 4A plurality of the first nanoparticles 124 are arranged to form a hexagonal close-packed face-centered cubic structure. Such periodically arranged nanoparticles are a necessary condition for the generation of a photonic bandgap.

[0069] Furthermore, the design principle is described as follows:

[0070] According to Bragg's law, λ=2D√(n 2 -sin2θ), where D is the radius of the nanoparticle, n is the average refractive index of the photonic crystal, θ is the angle between the incident light and the interface, and λ is the photon band gap position, that is, the peak position of selective reflection. It can be seen that the photon band gap, that is, the peak position of selective reflection, can be adjusted by adjusting two types of parameters: one is to adjust the refractive index of the photonic crystal, and the other is to adjust the radius of the nanoparticle;

[0071] Therefore, according to the above principle, by selecting the materials, refractive index and particle size of the first, second and third nanoparticles respectively, the first, second and third photonic crystals can selectively reflect light of different wavelengths.

[0072] In some embodiments, the first nanoparticles, the second nanoparticles and the third nanoparticles have a hollow structure. In this way, the materials of the first nanoparticles, the second nanoparticles and the third nanoparticles can be set to be the same, and the first photonic crystal, the second photonic crystal and the third photonic crystal can achieve their respective required selective reflection peak positions only by adjusting the hollow size and wall thickness of the first nanoparticles, the second nanoparticles and the third nanoparticles respectively.

[0073] Illustratively, the first nanoparticles, the second nanoparticles, and the third nanoparticles are all hollow silicon dioxide nanoparticles.

[0074] Table 1 below exemplarily shows the reflection peak data of photonic crystals composed of hollow silicon dioxide nanoparticles of different sizes:

[0075] Table 1

[0076] D / nm THK / nm λ / nm 160 100 437 170 50 448 170 100 464 180 30 455 180 50 473 180 100 490 200 10 461 200 50 521 200 100 542 220 10 504 220 50 570 220 100 594 250 10 569 250 30 615 250 50 641 270 10 611 270 20 639 280 5 615 280 10 633

[0077] Wherein, D is the radius of the silica nanoparticles, and THK is the wall thickness of the silica nanoparticles. By comprehensively adjusting the radius and wall thickness of the silica nanoparticles, a series of photonic crystals with different reflection peak positions can be constructed. It can be seen that by using silica nanoparticles of different sizes, the reflection peak positions of a series of photonic crystals constructed can cover the entire visible light band, thereby achieving the above-mentioned embodiment of the present invention, in which different annular sub-retaining walls are set to selectively reflect only light of corresponding colors.

[0078] In some embodiments, on the basis of setting the first nanoparticles, the second nanoparticles, and the third nanoparticles to be hollow structures, the wall thicknesses of the first nanoparticles, the second nanoparticles, and the third nanoparticles can be further set to be the same, and only by adjusting the hollow diameters of the first nanoparticles, the second nanoparticles, and the third nanoparticles, the first photonic crystal, the second photonic crystal, and the third photonic crystal can achieve their respective desired selective reflection peak positions;

[0079] Specifically, the hollow diameter of the first nanoparticle is greater than the hollow diameter of the second nanoparticle, the hollow diameter of the second nanoparticle is greater than the hollow diameter of the third nanoparticle, and the wall thickness of the first nanoparticle is equal to the wall thickness of the second nanoparticle, and the wall thickness of the second nanoparticle is equal to the wall thickness of the third nanoparticle.

[0080] In some embodiments, according to actual design requirements, the radius of the first nanoparticle, the second nanoparticle and the third nanoparticle is independently set to 160nm~200nm, and the wall thickness of the first nanoparticle, the second nanoparticle and the third nanoparticle is set to 5nm~100nm.

[0081] In some embodiments, the materials of the first nanoparticles, the second nanoparticles, and the third nanoparticles are independently selected from polystyrene, polymethyl methacrylate, polycarbonate, titanium dioxide, silicon dioxide, zirconium dioxide, aluminum oxide, and gallium oxide, wherein the materials of the first nanoparticles, the second nanoparticles, and the third nanoparticles can be set to be the same or different, depending on the actual process requirements.

[0082] In some embodiments, the first photonic crystal further includes a first photoresist resin filled in the gaps between the first nanoparticles, the second photonic crystal further includes a second photoresist resin filled in the gaps between the second nanoparticles, and the third photonic crystal further includes a third photoresist resin filled in the gaps between the third nanoparticles. For example, see Figure 4The first photonic crystal further includes a first photoresist resin 125 filling the gaps between the first nanoparticles 124;

[0083] By further filling the gaps between the nanoparticles with corresponding photoresist resins, on the one hand, the densely packed structure formed by the nanoparticles in the photonic crystal is fixed by the photoresist resin, so that the photonic crystal structure can be maintained stable, that is, each photonic crystal has good mechanical properties and optical stability. On the other hand, by adding the photoresist resin, the retaining wall layer with a predetermined pattern can be formed through a patterning process.

[0084] In some embodiments, the materials of the first photoresist resin, the second photoresist resin, and the third photoresist resin are independently selected from at least one of polyurethane acrylate resin and acrylic resin. Depending on actual needs, the materials of the first photoresist resin, the second photoresist resin, and the third photoresist resin are the same or different.

[0085] Furthermore, in this embodiment, the average refractive index of the photonic crystal depends on the refractive index of the nanoparticles and the photoresist resin, and can be specifically calculated by the following formula:

[0086] n 2 =f 纳米粒子 *n 2 纳米粒子 +f 光刻胶树脂 *n 2 光刻胶树脂 ;

[0087] Where n is the average refractive index of the photonic crystal, f 纳米粒子 is the volume fraction of nanoparticles, n 纳米粒子 is the refractive index of the nanoparticles, f 光刻胶树脂 is the volume ratio of photoresist resin, n 光刻胶树脂 is the refractive index of the photoresist resin;

[0088] Furthermore, when the nanoparticles are hollow, the refractive index of the nanoparticles can be calculated using the following formula:

[0089] n 2 =f air *n 2 air +f 壳层 *n 2 壳层 ;

[0090] Among them, f air is the volume ratio of the hollow area, n air is the refractive index of air, f 壳层 is the volume fraction of the shell, n壳层 is the refractive index of the shell.

[0091] In some embodiments, the display panel further includes a color resist layer 140 disposed on the barrier layer 120 and the color conversion layer 130 , and a second substrate 150 disposed on the color resist layer 140 ;

[0092] The color resist layer 140 includes a plurality of red color resists, a plurality of blue color resists, and a plurality of green color resists, wherein one red color resist covers a corresponding red sub-pixel area, one green color resist covers a corresponding green sub-pixel area, and one blue color resist covers a corresponding blue sub-pixel area.

[0093] The display panel provided by the present invention is further described below with reference to a specific embodiment.

[0094] The first annular sub-retaining wall is configured as follows: it is composed of a first photonic crystal that selectively reflects blue light:

[0095] Hollow silica nanoparticles with a hollow diameter of 185nm and a wall thickness of 20nm are arranged to form a hexagonal close-packed face-centered cubic structure, and a photoresist resin with a refractive index of 1.48 is further selected to fill the gap area between each nanoparticle. The first photonic crystal formed in this way can selectively reflect blue light, and its reflection peak is located at 450nm.

[0096] The second annular sub-retaining wall is configured as follows: it is composed of a second photonic crystal that selectively reflects green light.

[0097] Hollow silica nanoparticles with a hollow diameter of 220nm and a wall thickness of 20nm are arranged to form a hexagonal close-packed face-centered cubic structure, and a photoresist resin with a refractive index of 1.48 is further selected to fill the gap area between each nanoparticle. The second photonic crystal formed in this way can selectively reflect green light, and its reflection peak is located at 529nm.

[0098] The third annular sub-retaining wall is configured as follows: it is composed of a second photonic crystal that selectively reflects green light.

[0099] Hollow silica nanoparticles with a hollow diameter of 260nm and a wall thickness of 20nm are arranged to form a hexagonal close-packed face-centered cubic structure, and a photoresist resin with a refractive index of 1.48 is further selected to fill the gap area between each nanoparticle. The third photonic crystal formed in this way can selectively reflect green light, and its reflection peak is located at 630nm.

[0100] Another embodiment of the present invention further provides a method for manufacturing a display panel, wherein the display panel includes a plurality of first color sub-pixel regions, a plurality of second color sub-pixel regions, and a plurality of third color sub-pixel regions. Figure 5 , the method for preparing the display panel includes:

[0101] S10: providing a light-emitting substrate;

[0102] S20: forming a barrier layer on the light-emitting substrate, wherein forming the barrier layer includes forming a plurality of adjacent annular sub-barriers, wherein one of the annular sub-barriers has an opening, wherein forming the plurality of annular sub-barriers includes forming a plurality of first annular sub-barriers, a plurality of second annular sub-barriers, and a plurality of third annular sub-barriers; one of the first annular sub-barriers is arranged around a first color sub-pixel region, the first annular sub-barrier reflects the first color light and absorbs the second color light and the third color light; one of the second annular sub-barriers is arranged around a second color sub-pixel region, the second annular sub-barrier reflects the second color light and absorbs the first color light and the third color light; one of the third annular sub-barriers is arranged around a third color sub-pixel region, the third annular sub-barrier reflects the third color light and absorbs the first color light and the second color light;

[0103] S30: forming a color conversion layer on the light-emitting substrate, wherein the color conversion layer includes a plurality of color conversion films, and the color conversion films are formed in at least a portion of the openings.

[0104] Combine as follows Figures 6a-6h To elaborate further:

[0105] See also Figure 6a , providing a light-emitting substrate 110, the light-emitting substrate 110 including a first substrate 111, a plurality of light-emitting devices 112 disposed on the first substrate 111, and an encapsulation layer 113 disposed on each of the light-emitting devices 112;

[0106] See also Figure 6h , forming a barrier layer 120 on the light emitting substrate 110, see Figure 6i, forming the retaining wall layer 120 includes forming a plurality of adjacently arranged annular sub-retaining walls 120a, one of the annular sub-retaining walls 120a having an opening A, wherein forming the plurality of annular sub-retaining walls 120a includes forming a plurality of first annular sub-retaining walls 121, a plurality of second annular sub-retaining walls 122, and a plurality of third annular sub-retaining walls 123; one of the first annular sub-retaining walls 121 is arranged around a first color sub-pixel region and has a first opening A1, and the first annular sub-retaining wall 121 reflects the first color light and absorbs the second color light and the third color light; one of the second annular sub-retaining walls 122 is arranged around a second color sub-pixel region and has a second opening A2, and the second annular sub-retaining wall 122 reflects the second color light and absorbs the first color light and the third color light; one of the third annular sub-retaining walls 123 is arranged around a third color sub-pixel region and has a third opening A3, and the third annular sub-retaining wall reflects the third color light and absorbs the first color light and the second color light;

[0107] See also Figure 6h A color conversion layer 130 is formed on the light-emitting substrate 110, and the color conversion layer 130 includes a plurality of color conversion films 130a. The color conversion film 130a is formed in at least a portion of the opening A. Exemplarily, when each of the light-emitting devices 112 is a blue light-emitting device, the color conversion layer 130 includes a plurality of red light color conversion films 131 and a plurality of green light color conversion films 132. One of the red light color conversion films 131 is arranged in the third opening A3 of the corresponding third annular sub-blocking wall 123, and one of the green light color conversion films 132 is arranged in the second opening A2 of the corresponding second annular sub-blocking wall 122.

[0108] In some embodiments, the first annular sub-retaining wall 121 includes a first photonic crystal, the second annular sub-retaining wall includes a second photonic crystal, and the third annular sub-retaining wall includes a third photonic crystal. Specific steps for forming the retaining wall 120 are described as follows:

[0109] See also Figure 6b , providing a second substrate 150 , and forming a color resist layer 140 on the second substrate 150 ;

[0110] Furthermore, the steps of the first annular sub-retaining wall 121 include the following:

[0111] See also Figure 6b , forming a first nanoparticle accumulation film 121a on the color resist layer 140, wherein the first nanoparticle accumulation film 121a includes a plurality of first nanoparticles in an ordered and densely packed state;

[0112] See also Figure 6c, coating a first photoresist resin film 121b on the first nanoparticle accumulation film 121a;

[0113] See also Figure 6d , standing for 5-30 minutes to allow the first photoresist resin to fill the gap area between each of the first nanoparticles, thereby obtaining a first photonic crystal film 121c;

[0114] See also Figure 6e , patterning the first photonic crystal film 121c to obtain the first annular sub-blocking wall 121;

[0115] Furthermore, the second annular sub-retaining wall 122 and the third annular sub-retaining wall 123 are sequentially formed according to the steps similar to those for forming the first annular sub-retaining wall 121;

[0116] The steps of forming a plurality of the second annular sub-retaining walls 122 include:

[0117] forming a second nanoparticle stacking film, wherein the second nanoparticle stacking film includes a plurality of second nanoparticles in an ordered close-packed state;

[0118] forming a second photoresist resin film on the second nanoparticle accumulation film, and allowing the film to stand to obtain a second photonic crystal film;

[0119] patterning the second photonic crystal film to obtain the second annular sub-blocking wall;

[0120] The steps of forming a plurality of the third annular sub-retaining walls 123 include:

[0121] forming a third nanoparticle stacking film, wherein the third nanoparticle stacking film includes a plurality of third nanoparticles in an ordered and densely packed state;

[0122] forming a third photoresist resin film on the third nanoparticle accumulation film, and allowing the film to stand to obtain a third photonic crystal film;

[0123] patterning the third photonic crystal film to obtain the third annular sub-blocking wall;

[0124] The structure after forming each of the first annular sub-retaining walls 121, each of the second annular sub-retaining walls 122 and each of the third annular sub-retaining walls 123 is shown in FIG. Figure 6f , thus completing the preparation of the retaining wall layer 120;

[0125] See also Figure 6g Then, the color conversion layer 130 is formed on the color resist layer 140 , wherein the color conversion layer 130 includes a plurality of color conversion films 130 a , and the color conversion films 130 a are formed in at least a portion of the opening A;

[0126] See also Figure 6h The second substrate 150 formed with the color resist layer 140 , the barrier layer 120 and the color conversion layer 130 is assembled onto the light emitting substrate 110 to prepare the display panel.

[0127] In some embodiments, the first nanoparticle stacking film, the second nanoparticle stacking film, and the third nanoparticle stacking film are formed using a conventional gravity sedimentation self-assembly process so that the nanoparticles are arranged to form a hexagonal close-packed face-centered cubic structure, thereby achieving selective reflection of light in a specific wavelength band.

[0128] Another embodiment of the present invention further provides a display device, which includes the display panel provided by the above embodiment. The display device includes but is not limited to a mobile phone, a smart watch, a tablet computer, a laptop computer, a television, etc.

[0129] The above is a detailed introduction to a display panel, a preparation method, and a display device provided by an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, based on the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A display panel, characterized in that: The display panel includes a plurality of first color sub-pixel areas, a plurality of second color sub-pixel areas, and a plurality of third color sub-pixel areas. The display panel includes: light-emitting substrate; A retaining wall layer is provided on the light-emitting substrate and includes a plurality of adjacent annular sub-retaining walls, wherein one of the annular sub-retaining walls has an opening; a color conversion layer, disposed on the light-emitting substrate, comprising a plurality of color conversion films, wherein the color conversion films are disposed in at least a portion of the openings; The plurality of annular sub-retaining walls include a plurality of first annular sub-retaining walls, a plurality of second annular sub-retaining walls and a plurality of third annular sub-retaining walls; A first annular sub-blocking wall is disposed around a first color sub-pixel region, and the first annular sub-blocking wall reflects the first color light and absorbs the second color light and the third color light; A second annular sub-blocking wall is disposed around a second color sub-pixel region, and the second annular sub-blocking wall reflects the second color light and absorbs the first color light and the third color light. The third annular sub-blocking wall is disposed around the third color sub-pixel region, and the third annular sub-blocking wall reflects the third color light and absorbs the first color light and the second color light.

2. The display panel according to claim 1, wherein: The first annular sub-blocking wall includes a first photonic crystal, the second annular sub-blocking wall includes a second photonic crystal, and the third annular sub-blocking wall includes a third photonic crystal.

3. The display panel according to claim 2, wherein: The first photonic crystal includes a plurality of first nanoparticles in an ordered close-packed state, the second photonic crystal includes a plurality of second nanoparticles in an ordered close-packed state, and the third photonic crystal includes a plurality of third nanoparticles in an ordered close-packed state.

4. The display panel according to claim 3, wherein: The first nanoparticles, the second nanoparticles, and the third nanoparticles have a hollow structure.

5. The display panel according to claim 4, wherein: The hollow diameter of the first nanoparticle is larger than the hollow diameter of the second nanoparticle, and the hollow diameter of the second nanoparticle is larger than the hollow diameter of the third nanoparticle; The wall thickness of the first nanoparticle is equal to the wall thickness of the second nanoparticle, and the wall thickness of the second nanoparticle is equal to the wall thickness of the third nanoparticle.

6. The display panel according to claim 3, wherein: Materials of the first nanoparticles, the second nanoparticles, and the third nanoparticles are independently selected from polystyrene, polymethyl methacrylate polycarbonate, titanium dioxide, silicon dioxide, zirconium dioxide, aluminum oxide, and gallium oxide.

7. The display panel according to claim 3, wherein: The first photonic crystal further includes a first photoresist resin filling the gaps between the first nanoparticles, the second photonic crystal further includes a second photoresist resin filling the gaps between the second nanoparticles, and the third photonic crystal further includes a third photoresist resin filling the gaps between the third nanoparticles.

8. A method for preparing a display panel, characterized in that: The display panel includes a plurality of first color sub-pixel regions, a plurality of second color sub-pixel regions, and a plurality of third color sub-pixel regions. The manufacturing method of the display panel includes: S10: providing a light-emitting substrate; S20: forming a barrier layer on the light-emitting substrate, wherein forming the barrier layer includes forming a plurality of adjacent annular sub-barriers, wherein one of the annular sub-barriers has an opening, wherein forming the plurality of annular sub-barriers includes forming a plurality of first annular sub-barriers, a plurality of second annular sub-barriers, and a plurality of third annular sub-barriers; one of the first annular sub-barriers is arranged around a first color sub-pixel region, the first annular sub-barrier reflects the first color light and absorbs the second color light and the third color light; one of the second annular sub-barriers is arranged around a second color sub-pixel region, the second annular sub-barrier reflects the second color light and absorbs the first color light and the third color light; one of the third annular sub-barriers is arranged around a third color sub-pixel region, the third annular sub-barrier reflects the third color light and absorbs the first color light and the second color light; S30: forming a color conversion layer on the light-emitting substrate, wherein the color conversion layer includes a plurality of color conversion films, and the color conversion films are formed in at least a portion of the openings.

9. The method for manufacturing a display panel according to claim 8, wherein: In the step S20, the step of forming a plurality of the first annular sub-retaining walls includes: forming a first nanoparticle accumulation film, wherein the first nanoparticle accumulation film includes a plurality of first nanoparticles in an ordered and densely packed state; forming a first photoresist resin film on the first nanoparticle accumulation film, and allowing the film to stand to obtain a first photonic crystal film; patterning the first photonic crystal film to obtain the first annular sub-blocking wall; The steps of forming a plurality of the second annular sub-retaining walls include: forming a second nanoparticle stacking film, wherein the second nanoparticle stacking film includes a plurality of second nanoparticles in an ordered close-packed state; forming a second photoresist resin film on the second nanoparticle accumulation film, and allowing the film to stand to obtain a second photonic crystal film; patterning the second photonic crystal film to obtain the second annular sub-blocking wall; The steps of forming a plurality of third annular sub-retaining walls include: forming a third nanoparticle stacking film, wherein the third nanoparticle stacking film includes a plurality of third nanoparticles in an ordered and densely packed state; forming a third photoresist resin film on the third nanoparticle accumulation film, and allowing the film to stand to obtain a third photonic crystal film; The third photonic crystal film is patterned to obtain the third annular sub-blocking wall.

10. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 7.

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