A display panel and display device

Abstract

The application discloses a display panel and a display device, the display panel comprising a plurality of light emitting elements and a light filtering structure located on the light emitting side of the light emitting elements; the light emitting element comprising a light emitting body and a first electrode located on the side of the light emitting body away from the substrate base plate; the first electrode and / or the light filtering structure comprising a plurality of microstructure openings; by opening a plurality of microstructure openings in the first electrode corresponding to the light emitting element and / or the light filtering structure, the thickness of the first electrode corresponding to the light emitting area of the light emitting element and / or the light filtering structure is thinned, the purpose of increasing the transmittance of the light emitted by the light emitting area of the light emitting element is achieved; meanwhile, the propagation direction of external ambient light is disturbed by using the plurality of microstructure openings, so that the external ambient light is scattered in the plurality of microstructure openings, the reflection of the display panel on the external light can be weakened, the display effect of the display panel is improved, the overall power consumption of the display panel is reduced, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display, in particular to a display panel and a display device. BACKGROUND

[0002] In the existing display panel, there are still problems of high reflectivity of the display panel to external light, low transmittance of the display light emitted by the display panel, and poor display effect, which cannot fully meet the application requirements of the display panel. SUMMARY

[0003] The present application provides a display panel and a display device, by opening a plurality of microstructure openings in the cathode of the light emitting element and / or the light filtering structure, the problems of low light efficiency, high reflectivity and poor display effect of the display panel are solved.

[0004] In a first aspect, the embodiments of the present application provide a display panel, comprising a plurality of light emitting elements and a light filtering structure located on the light emitting side of the light emitting element;

[0005] The light emitting element comprises a light emitting body and a first electrode located on the side of the light emitting body away from the substrate substrate; the first electrode and / or the light filtering structure comprises a plurality of microstructure openings;

[0006] Along the thickness direction of the display panel, the distance between the surface of the first electrode close to the substrate substrate and the surface thereof away from the substrate substrate, and the distance between the surface of the light filtering structure close to the substrate substrate and the surface thereof away from the substrate substrate are both greater than the opening depth of the microstructure opening.

[0007] In a second aspect, the embodiments of the present application also provide a display device, which further comprises the display panel provided in the first aspect.

[0008] The display panel provided by the embodiments of the present application, by opening a plurality of microstructure openings in the corresponding first electrode of the light emitting element and / or the light filtering structure, thinning the thickness of the first electrode and / or the light filtering structure corresponding to the light emitting area of the light emitting element, achieves the purpose of increasing the transmittance of the light emitted by the light emitting area of the light emitting element; at the same time, the propagation direction of the external ambient light is disturbed by the plurality of microstructure openings, so that the external ambient light is scattered in the plurality of microstructure openings, which can weaken the reflection of the display panel to the external light, improve the display effect of the display panel, and is conducive to reducing the overall power consumption of the display panel and improving the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a cross-sectional schematic view of a display panel provided by the related art;

[0010] Figure 2 is Figure 1A structure diagram of a light emitting element in a middle A region;

[0011] Figure 3 A cross-sectional schematic diagram of a display panel provided by an embodiment of the application;

[0012] Figure 4 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0013] Figure 5 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0014] Figure 6 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0015] Figure 7 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0016] Figure 8 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0017] Figure 9 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0018] Figure 10 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0019] Figure 11 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0020] Figure 12 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0021] Figure 13 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0022] Figure 14 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0023] Figure 15 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0024] Figure 16 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0025] Figure 17 A cross-sectional schematic diagram of another display panel provided by an embodiment of the application;

[0026] Figure 18is a structural schematic diagram of another display device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0027] The present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for the purpose of interpretation of the present application and are not limiting of the present application. In addition, it should be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings and not all the structures.

[0028] Figure 1 is a cross-sectional schematic diagram of a display panel provided by the related art; Figure 2 is Figure 1 is a structural schematic diagram of a light emitting element in region A. Taking an OLED display panel as an example, Figure 2 is a surface schematic diagram of a light emitting element in region A, Figure 2 is a cross-sectional schematic diagram of (a) along AA' direction. In combination with Figure 1 and Figure 2 As shown in FIG. 1, a display panel 100 in the related art includes a substrate 10 and a driving circuit layer 11, a light emitting layer 12 and a filter layer 13 successively located on one side of the substrate 10, the light emitting layer 12 includes a plurality of light emitting elements 120 and pixel defining structures 130 located between adjacent two light emitting elements 120, and the light emitting element 120 includes a first electrode 121, a light emitting host 122 and a second electrode 123 successively located on one side of the substrate 10. The first electrode 121 is an anode and is usually made of a metal material with good conductivity, and the second electrode 123 is a cathode and is usually made of a transparent conductive material with good conductivity, such as ITO, etc.; the filter layer 13 includes a plurality of filter structures 131, and the filter wavelength of the filter structure 131 corresponds to the light emitting color of the corresponding light emitting element 120. As shown in FIG. 2, in the existing material, the transmittance of external light in the a, b, c regions corresponding to the filter structure 131, the second electrode 123 and the pixel defining structure 130 is relatively high, and the first electrode 121 and the second electrode 123 of the light emitting element 120 have relatively high reflectivity; the a region is the light emitting area of the light emitting element 120, and the outgoing light of the light emitting element 120 has a relatively low transmittance problem, which leads to poor display effect of the display panel and affects the normal display of the display panel. Figure 2

[0029] ​Based on the above technical problems, the inventors have found that by performing microstructure processing on the electrode layer and the filter layer on the light-emitting side of the light-emitting element, the transmittance of external light and the reflectivity of the display panel to external light can be reduced, and the light-emitting efficiency of the light-emitting region of the light-emitting element can be improved. Based on this, the inventors have further researched the technical solutions of the embodiments of the present application. Specifically, the embodiments of the present application provide a display panel including a plurality of light-emitting elements and a filter structure located on the light-emitting side of the light-emitting element; the light-emitting element includes a light-emitting body and a first electrode located on the side of the light-emitting body away from the substrate; the first electrode and / or the filter structure includes a plurality of microstructure openings; along the thickness direction of the display panel, the distance between the surface of the first electrode close to the substrate and the surface thereof away from the substrate and the distance between the surface of the filter structure close to the substrate and the surface thereof away from the substrate are both greater than the opening depth of the microstructure openings. By adopting the above technical solutions, by opening a plurality of microstructure openings in the cathode corresponding to the light-emitting element and / or the filter structure, the thickness of the cathode and / or the filter structure is partially thinned, the transmittance of the emitted light of the light-emitting region of the light-emitting element can be increased, at the same time, by utilizing the scattering of external ambient light at the plurality of microstructure openings, the reflection of the display panel to external light can be weakened, the display effect of the display panel can be improved, which is conducive to reducing the overall power consumption of the display panel and improving the user experience.

[0030] The above is the core idea of the present application, and the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] Figure 3 is a cross-sectional schematic view of a display panel provided by an embodiment of the present application; Figure 4 is a cross-sectional schematic view of another display panel provided by an embodiment of the present application; Figure 5 is a cross-sectional schematic view of another display panel provided by an embodiment of the present application; Figure 6 is a cross-sectional schematic view of another display panel provided by an embodiment of the present application; Figure 7 is a cross-sectional schematic view of another display panel provided by an embodiment of the present application; Figure 8 is a cross-sectional schematic view of another display panel provided by an embodiment of the present application. In combination with Figures 3-8As shown, the display panel 200 provided by the embodiment of the present application includes a plurality of light emitting elements 220 and a light filtering structure 231 located at the light emitting side of the light emitting element 220; the light emitting element 220 includes a light emitting body 222 and a first electrode 223 located at the side of the light emitting body 222 away from the substrate 20; the first electrode 223 and / or the light filtering structure 231 includes a plurality of microstructure openings 30; along the thickness direction (as shown by the Z direction in the figure) of the display panel, the distance h1 between the surface of the first electrode 223 close to the substrate 20 and the surface of the first electrode 223 away from the substrate 20 and the distance h2 between the surface of the light filtering structure 231 close to the substrate 20 and the surface of the light filtering structure 231 away from the substrate 20 are both greater than the opening depth h0 of the microstructure opening 30.

[0032] Specifically, taking the display panel 200 as an organic light emitting display panel (OLED) and the light emitting element 220 as an organic light emitting diode as an example, the substrate 20 of the display panel can be a rigid material such as glass or silicon wafer, or a flexible material such as ultra-thin glass, metal foil or polymer plastic material, and the flexible or rigid substrate 20 can block oxygen and moisture, preventing moisture or impurities from diffusing into the inside of the display panel through the substrate 20. The display panel 200 further includes a driving circuit layer 21, a light emitting layer 22 and a light filtering layer 23 located at the side of the substrate 20 in sequence, the light emitting layer 22 includes a plurality of light emitting elements 220; the driving circuit layer 21 is used to drive the light emitting element 40 to emit light; the light filtering layer 23 includes a plurality of light filtering structures 231, the light filtering structure 231 is a color resistance, the light filtering wavelength of the light filtering structure 231 corresponds to the light emitting color of the corresponding light emitting element 220, such as red color resistance, green color resistance and blue color resistance, which is used to improve the light emitting purity of the light emitting element 40 and improve the contrast of the display panel. The light emitting element 120 includes a second electrode 221, a light emitting body 222 and a first electrode 223 located at the side of the substrate 20 in sequence. The second electrode 221 is an anode, and the material includes metals such as Cr, Pt, Ru, Au, Ag, Mo, Al, W, Cu and / or AlNd; the first electrode 223 is a cathode, and the material includes ITO (indium tin oxide), IZO (indium zinc oxide), ITO / Ag / ITO, etc.; and the light emitting material of the light emitting body 222 can be low-molecular or high-molecular organic material.

[0033] The first electrode 223 and / or the light filtering structure 231 at the light emitting side of the light emitting element 220 can be locally thinned by using a patterning process, such as Figure 3 and Figure 4 As shown, along the Z direction in the figure, a plurality of microstructure openings 30 are opened in the first electrode 223 corresponding to the light emitting body 222 of the light emitting element 220, the microstructure opening 30 is a blind hole, and the thickness h0 of the microstructure opening 30 is less than the thickness h1 of the corresponding first electrode 223; as shown in Figure 5 and Figure 6As shown, along the Z direction in the figure, multiple microstructure openings 30 are formed within the filter structure 231 corresponding to the light-emitting body 222 of the light-emitting element 220. The microstructure openings 30 are blind holes, and their thickness h0 is less than the thickness h2 of the corresponding filter structure 231; or, as shown... Figure 7 and Figure 8 As shown, multiple microstructure openings 30 are formed in the first electrode 223 and the filter structure 231 corresponding to the light-emitting body 222 of the light-emitting element 220. The microstructure openings 30 are blind holes.

[0034] The microstructure opening 30 can be hollowed out; alternatively, the interior of the microstructure opening 30 can be filled with a material with a different refractive index than the first electrode 223 and the filter structure 231, such as transparent optical adhesive (OC). The three-dimensional shape of the microstructure opening 30 is not specifically limited here; it can be a cuboid, cylinder, cone, trapezoidal truncated pyramid, etc.

[0035] Combination Figure 3 and Figure 5 As shown, ambient light S1 undergoes refraction, reflection, and total internal reflection at the interface between the microstructure opening 30 and the first electrode 223, the microstructure opening 30, and the filter structure 231. The microstructure opening 30 alters the propagation mode of ambient light S1, causing it to be easily scattered within multiple microstructure openings. The ambient light reaching the anode and cathode of the light-emitting element becomes disordered, and the ambient light reflected by the anode and cathode of the light-emitting element 220 forms stray light emission. Increasing the number of microstructure openings 30 helps reduce the impact of reflected light on the display effect of the display panel and improves the user experience. Furthermore, due to the local thinning of the first electrode 223 and / or the filter structure 231, the transmittance of the light emitted from the light-emitting area of ​​the light-emitting element 220 is improved, reducing the overall driving power consumption of the display panel.

[0036] It should be noted that "patterning" in this article specifically refers to a non-integral structure, that is, a structure in which an integral layer of material is first formed during the manufacturing process and then the specific shape is etched out. The display device provided in this embodiment also includes other film layers, such as pixel limiting layers and thin film encapsulation layers, which work together to realize the display function of the display device, and will not be shown one by one here. In this embodiment, the thickness direction of the display panel is the Z direction in the attached drawings.

[0037] In summary, the display panel provided by the embodiments of the present invention increases the transmittance of light emitted from the light-emitting area of ​​the light-emitting element by creating multiple microstructure openings in the first electrode and / or filter structure corresponding to the light-emitting element and reducing the thickness of the first electrode and / or filter structure. At the same time, the multiple microstructure openings disrupt the propagation direction of ambient light, causing ambient light to scatter within the multiple microstructure openings. This reduces the reflection of ambient light by the display panel, improves the display effect, reduces the overall power consumption of the display panel, and enhances the user experience.

[0038] One feasible implementation method, optionally, combined with Figure 3 and Figure 4 As shown, the first electrode 223 includes a first electrode layer 2331 and a second electrode layer 2332 stacked together. The second electrode layer 2332 is located on the side of the first electrode layer 2331 away from the light-emitting body 222. A plurality of microstructure openings 30 are located on the side of the second electrode layer 2332 away from the light-emitting body 222.

[0039] Specifically, in combination Figure 3 and Figure 4 As shown, when designing the microstructure of the cathode surface corresponding to the light-emitting area of ​​the light-emitting element 220, the cathode corresponding to the light-emitting body 222 of the light-emitting element 220 can be divided into a multi-layer structure, preferably a two-layer structure. Along the Z-direction in the figure, a first electrode layer 2331 and a second electrode layer 2332 are sequentially fabricated in the region corresponding to the light-emitting body 222. Both the first electrode layer 2331 and the second electrode layer 2332 transmit the driving voltage signal simultaneously. Multiple microstructure openings 30 are etched on the surface of the second electrode layer away from the light-emitting body 222 using an etching process to meet the light transmission requirements. Through the two-layer structure design, multiple microstructure openings 30 are fabricated only within the second electrode layer 2332, ensuring the normal transmission of the driving voltage signal within the first electrode 223 and guaranteeing normal light emission of the light-emitting element 220.

[0040] One feasible implementation method, optionally, combined with Figure 5 and Figure 6 As shown, the filter structure 231 includes a first filter layer 2311 and a second filter layer 2312 stacked together. The second filter layer 2312 is located on the side of the first filter layer 2311 away from the light-emitting element 220. Multiple microstructure openings 30 are disposed on the side of the second filter layer 2312 away from the light-emitting element 220.

[0041] Specifically, in combination Figure 5 and Figure 6As shown, when the light-emitting element 220 is microstructured on the color resistance surface corresponding to the light-emitting area, the color resistance corresponding to the light-emitting element 220 can be divided into a multi-layer structure, preferably a two-layer structure. In the Z direction in the figure, the first filter layer 2311 and the second filter layer 2312 are sequentially prepared in the area of the light-emitting element 220 corresponding to the filter layer 23. An etching process is used to etch a plurality of microstructure openings 30 on the side surface of the second filter layer 2312 away from the light-emitting element 220 to meet the light transmission requirement. Through the two-layer structure design, a plurality of microstructure openings 30 are prepared in the second filter layer 2312, and by adjusting the thickness of the second filter layer 2312, the opening depth of the microstructure opening 30 can be controlled, and the preparation difficulty of the microstructure opening 30 is reduced.

[0042] Based on the above embodiments, continue to refer to Figures 3-8 As shown, the emission wavelength of the light-emitting element 220 is λ, and the minimum width of the microstructure opening 30 in any plane perpendicular to the thickness direction of the display panel (such as the XY plane in the figure) is D1, and λ≤D1.

[0043] Specifically, the light-emitting wavelengths of different light-emitting elements 220 are different, such as the light-emitting wavelength λ1 of the red light-emitting element being 597mm-770nm, the light-emitting wavelength λ2 of the green light-emitting element being 492mm-597nm, and the light-emitting wavelength λ3 of the blue light-emitting element being 350mm-492mm. For different light-emitting wavelengths of the light-emitting element 220, the cathode surface of the light-emitting element and the filter structure 231 surface corresponding to the light-emitting element 220 are microstructured. For example, Figures 3-8 The three-dimensional structure shape of the microstructure opening 30 in the above embodiment is taken as an example, and in the XY plane in the figure, the opening width D1 of the microstructure opening 30 is the diameter of the cylinder. In other embodiments, the three-dimensional structure shape of the microstructure opening 30 can be a pyramid, a cuboid, a trapezoidal table, etc. In the Z direction in the figure, the opening width D1 of the microstructure opening 30 can gradually increase or gradually decrease in any XY plane, etc. Here, no specific limitation is made, as long as the opening width D1 of the microstructure opening 30 is greater than the light-emitting wavelength λ of the light-emitting element in any XY plane.

[0044] For example, the opening width D1 of the microstructure opening corresponding to the red light-emitting element is designed according to the red light transmittable wave band, λ1<D1; the opening width D1 of the microstructure opening corresponding to the green light-emitting element is designed according to the green light transmittable wave band, λ2<D1; and the opening width D1 of the microstructure opening corresponding to the blue light-emitting element is designed according to the blue light transmittable wave band, λ3<D1. By reasonably setting the opening width, the light-emitting wavelengths of different light-emitting elements can be transmitted through the microstructure opening, thereby improving the light-emitting efficiency of the light-emitting element at the normal viewing angle S2, such as Figure 4 、 Figures 6-8 As shown.

[0045] On the basis of the above-mentioned embodiments, further referring to Figures 3-8 As shown in the figure, the emitting wavelength of the light emitting element 220 is λ, and the minimum distance between the two adjacent microstructure openings 30 is D2, λ≤D2.

[0046] Specifically, based on the analysis of the above-mentioned embodiments, also taking Figures 3-8 the cylindrical body as an example, the minimum distance between the two adjacent microstructure openings 30 is greater than the emitting wavelength λ of the light emitting element. For example, the distance D2 between the two adjacent microstructure openings corresponding to the red light emitting element is designed according to the red light transmittable wave band, λ1<D2; the distance D2 between the two adjacent microstructure openings corresponding to the green light emitting element is designed according to the green light transmittable wave band, λ2<D2; and the distance D2 between the two adjacent microstructure openings corresponding to the blue light emitting element is designed according to the blue light transmittable wave band, λ3<D2. By reasonably setting the distance, it is ensured that the emitting wavelength of different light emitting elements can be transmitted through the gap between the adjacent microstructure openings, and the light emitting efficiency of the light emitting element at the normal viewing angle S2 is ensured, as shown in Figure 4 、 Figures 6-8 .

[0047] On the basis of the above-mentioned embodiments, further referring to Figures 3-8 As shown in the figure, the multiple microstructure openings 30 are arranged at equal intervals.

[0048] Specifically, the multiple microstructure openings 30 arranged at equal intervals are arranged on the surface of the first electrode 223 and / or the filter structure 231, which is beneficial to simplify the preparation process. Meanwhile, the multiple microstructure openings 30 uniformly diffuse the external ambient light and uniformly reduce the overall reflectivity of the display panel, thereby improving the display effect.

[0049] On the basis of the above-mentioned embodiments, further referring to Figure 3 、 Figure 5 and Figure 7 As shown in the figure, the opening depth h0 of each microstructure opening 30 is the same along the thickness direction (indicated by the Z direction in the figure) of the display panel.

[0050] Specifically, the multiple microstructure openings 30 with the same opening depth h0 are arranged on the surface of the first electrode 223 and / or the filter structure 231, which is beneficial to simplify the preparation process. On this basis, the multiple microstructure openings 30 can also be arranged at equal intervals to further uniformly diffuse the external ambient light, uniformly reduce the overall reflectivity of the display panel, and improve the display effect.

[0051] On the basis of the above-mentioned embodiments, further referring to Figure 4 and Figure 7As shown, the first electrode 223 includes a plurality of microstructure openings 30; along the thickness direction of the display panel (as shown in the Z direction in the figure), with the center of the first electrode 223 as the center, the depth of the microstructure openings 30 away from the center is greater than the depth of the microstructure openings 30 close to the center.

[0052] Specifically, considering that the light emitted by the light emitting element 220 at a large viewing angle has low light emission efficiency, a plurality of microstructure openings 30 with different opening depths h0 can also be arranged on the surface of the first electrode 223. With the center of the first electrode 223 as the center, the center of the first electrode 223 corresponds to the center of the light emission of the light emitting element 220 at a normal viewing angle, and around this center, the depth of the microstructure openings 30 away from the center is greater than the depth of the microstructure openings 30 close to the center. As the emission angle of the light emitted by the light emitting element 220 increases, the thickness of the first electrode 223 in the region of the microstructure openings 30 gradually decreases, which is beneficial to improve the light emission efficiency of the light emitted by the light emitting element 220 at a large viewing angle, optimize the brightness decay and color shift at a large viewing angle, and improve the display effect of the display panel.

[0053] Figure 9 is another cross-sectional view of a display panel provided by an embodiment of the present application; Figure 10 is another cross-sectional view of a display panel provided by an embodiment of the present application; Figure 11 is another cross-sectional view of a display panel provided by an embodiment of the present application. For display panels that do not need to increase the light emission of the light emitting element at a large viewing angle, a feasible implementation manner is as follows, referring to Figure 9 and Figure 11 As shown, the first electrode 223 includes a plurality of microstructure openings 30, and the central light emitting axis P of the light emitting element 220 passes through the center of the first electrode 223. Around the center of the first electrode 223, the depth h0 of the microstructure openings 30 away from the center is less than the depth h0 of the microstructure openings 30 close to the center; referring to Figure 10 and Figure 11 As shown, the central light emitting axis P of the light emitting element 220 passes through the center of the light filtering structure 231, and around the center of the light filtering structure 231, the depth h0 of the microstructure openings 30 away from the center is less than the depth h0 of the microstructure openings 30 close to the center. The depth design of the above-mentioned microstructure openings 30 is beneficial to weaken the light emission of the light emitting element 220 at a large viewing angle, improve the central brightness of the light emitting element 220, and improve the light emission efficiency of the light at a normal viewing angle along the light emitting axis.

[0054] Specifically, a plurality of microstructure openings 30 with different opening depths h0 can be arranged on the surface of the light filtering structure 231. Taking the center of the light filtering structure 231 as the center of a circle, the center of the light filtering structure 231 corresponds to the center of the normal viewing angle light emission of the light emitting element 220, and around the center, the depth of the microstructure opening 30 away from the center of the circle is greater than the depth of the microstructure opening 30 close to the center of the circle. As the emission angle of the light emitted by the light emitting element 220 increases, the thickness of the light filtering structure 231 in the region of the microstructure opening 30 is gradually reduced, which is beneficial to improve the light emission efficiency of the light emitting element 220 for large viewing angle light, optimize the large viewing angle brightness decay and color deviation, and improve the display effect of the display panel.

[0055] Figure 12 is a cross-sectional view of another display panel provided by an embodiment of the present application; Figure 13 is a cross-sectional view of another display panel provided by an embodiment of the present application; Figure 14 is a cross-sectional view of another display panel provided by an embodiment of the present application. Based on the above embodiments, in combination with Figures 14-17 As shown in the figure, the display panel 200 further includes a pixel limiting layer 24, which includes a plurality of pixel openings (not shown in the figure), and the light emitting element 220 is located in the pixel opening; the pixel limiting layer 24 includes at least two layers of first limiting layer 241 and second limiting layer 242 arranged in a stack, and the second limiting layer 242 is located on the side of the first limiting layer 241 away from the substrate 20; along the thickness direction of the display panel (as shown by the Z direction in the figure), the projection of the second limiting layer 242 is located within the projection of the first limiting layer 241, and the bottom angle of the first limiting layer 241 close to the light emitting element 220 is α1; the bottom angle of the second limiting layer 242 close to the light emitting element 220 is α2, and α2≤α1.

[0056] Specifically, in combination with Figures 14-17 As an example of an OLED display panel, the display panel further includes a pixel limiting layer 24 for limiting the light emitting area, which can prevent or reduce color mixing between pixels, and the material thereof can include at least one of polyimide, polyamide, acrylic resin, cyclobutene, and phenolic resin, etc. organic insulating materials. The structure of the pixel limiting layer 24 can be adjusted to increase the aperture ratio of the light emitting area of the light emitting element 220 and improve the light emission rate of the large viewing angle light S3. For example, the pixel limiting layer 24 adopts a multi-layer structure, and as an example of a two-layer structure, the first limiting layer 241 and the second limiting layer 242 are sequentially prepared on one side of the substrate 20, and the first limiting layer 241 and the second limiting layer 242 form a stepped structure as shown in the figure. Figures 14-17 The bottom angle of the first limiting layer 241 close to the light emitting element 220 is α1, which is greater than the bottom angle of the second limiting layer 242 close to the light emitting element 220, which is α2.

[0057] Optionally, the first limiting layer 241 is arranged to have an angle a 1 of 30°-90° with respect to the bottom corner of the light emitting element 220, and the second limiting layer 242 is arranged to have an angle a 2 of 30°-60° with respect to the bottom corner of the light emitting element 220.

[0058] By optimizing the pixel limiting layer 24, the opening size L1 of the light emitting main body 222 of the light emitting element 220 can be gradually increased along the Z direction in the figure, the light ray S3 with a large viewing angle emitted by the light emitting element 220 can be effectively increased, and the light emitting efficiency of the light emitting element can be improved.

[0059] On the basis of the above-mentioned embodiments, in combination with Figure 16 and Figure 17 as shown, the display panel further comprises a light shielding structure 25 located between two adjacent light filtering structures 231; the light shielding structure 25 comprises a first light shielding layer 251 and a second light shielding layer 252 arranged in a stack, and the second light shielding layer 252 is located on the side of the first light shielding layer 251 away from the substrate 20; along the thickness direction of the display panel (as shown by the Z direction in the figure), the second light shielding layer 252 is projected within the projection of the first light shielding layer 251; the first light shielding layer 251 has an angle a 3 with respect to the bottom corner of the light filtering structure 231, and the second light shielding layer 252 has an angle a 4 with respect to the bottom corner of the light filtering structure 231, wherein a 4≤a 3.

[0060] In combination with Figure 16 and Figure 17 as shown, taking an OLED display panel as an example, the display panel further comprises a light shielding structure 25 located between two adjacent light filtering structures 231, for shielding part of the light rays with a large viewing angle emitted by the two adjacent light emitting elements 220, to avoid light ray crosstalk. The light shielding structure 25 can also be adjusted to change the shape of the light filtering structure 231, to improve the light emitting rate of the light ray S3 with a large viewing angle emitted by the light emitting element 220. For example, the light shielding structure 25 adopts a multi-layer structure, and taking a two-layer structure as an example, the first light shielding layer 251 and the second light shielding layer 252 are sequentially prepared when the light filtering layer 23 is prepared, the first light shielding layer 251 and the second light shielding layer 252 form a stepped structure as shown in Figures 14-17 , and the first light shielding layer 251 is arranged to have an angle a 3 of 30°-90° with respect to the bottom corner of the light filtering structure 231, and the second light shielding layer 252 is arranged to have an angle a 4 of 30°-60° with respect to the bottom corner of the light filtering structure 231; along the Z direction in the figure, the light filtering structure 231 is arranged to project and cover the projection of the light emitting element 220 corresponding to the light filtering structure 231.

[0061] Optionally, the first light shielding layer 251 is arranged to have an angle a 3 of 30°-90° with respect to the bottom corner of the light filtering structure 231, and the second light shielding layer 252 is arranged to have an angle a 4 of 30°-60° with respect to the bottom corner of the light filtering structure 231.

[0062] By optimizing the shading structure 25, the opening size L2 of the filter structure 231 can be gradually increased along the Z direction in the figure, so that the large visual angle light S3 emitted by the light emitting element 220 can be emitted after passing through the filter structure 231, which is beneficial to improve the light emitting purity of the light emitting element 220 and the contrast of the display panel.

[0063] In combination Figures 2-17 As shown in the above embodiment, on the basis of the above embodiment, a plurality of microstructure openings 30 are arranged on the first electrode 223 of the light emitting element 220 and / or the surface of the filter structure 231. The microstructure openings 30 can further improve the light emitting efficiency of the display panel and reduce the reflected light of the display panel. The structure design of the microstructure openings 30 and the beneficial effects thereof are described in the above embodiment, and will not be described hereinafter.

[0064] Based on the same inventive concept, the embodiment of the present application also provides a display device. Figure 18 As shown in the structural schematic diagram of the display device provided by the embodiment of the present application, Figure 18 The display device includes any one of the display panels provided by the above embodiments. For example, as shown in the display device 300, Figure 18 The display device 300 includes the display panel 200. Therefore, the display device also has the beneficial effects of the display panel in the above embodiments, and the same parts can be understood by referring to the above description of the display panel, and will not be described hereinafter.

[0065] The display device 300 provided by the embodiment of the present application can be Figure 18 As shown in the structural schematic diagram of the display device provided by the embodiment of the present application,

[0066] Note that the above are only the preferred embodiments of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the appended claims.

Claims

1. A display panel, characterized by, The display panel comprises a plurality of light-emitting elements and a light filtering structure located on the light-emitting side of the light-emitting elements. The light-emitting element comprises a light-emitting body and a first electrode located on the side of the light-emitting body away from the substrate base plate; the first electrode and the light filtering structure comprise a plurality of microstructure openings. Along the thickness direction of the display panel, the distance between the surface of the first electrode close to the substrate base plate and the surface thereof away from the substrate base plate and the distance between the surface of the light filtering structure close to the substrate base plate and the surface thereof away from the substrate base plate are both greater than the opening depth of the microstructure opening. The emission wavelength of the light-emitting element is λ, and in any plane perpendicular to the thickness direction of the display panel, the minimum width of the microstructure opening is D1, and λ≤D1.

2. The display panel of claim 1, wherein, The first electrode comprises a first electrode layer and a second electrode layer arranged in stack, and the second electrode layer is located on the side of the first electrode layer away from the light-emitting body; a plurality of microstructure openings are arranged on the side of the second electrode layer away from the light-emitting body.

3. The display panel of claim 1, wherein, The light filtering structure comprises a first light filtering layer and a second light filtering layer arranged in stack, and the second light filtering layer is located on the side of the first light filtering layer away from the light-emitting element; The second light filtering layer comprises a plurality of microstructure openings arranged on the side of the second light filtering layer away from the light-emitting element.

4. The display panel of claim 1, wherein, The emission wavelength of the light-emitting element is λ, and the minimum distance between two adjacent microstructure openings is D2, and λ≤D2.

5. The display panel of claim 1, wherein, The plurality of microstructure openings are arranged at equal intervals.

6. The display panel of claim 1, wherein, Along the thickness direction of the display panel, the opening depth of each microstructure opening is the same.

7. The display panel of claim 1, wherein, Along the thickness direction of the display panel, the light-emitting body comprises a central light-emitting axis; the depth of the microstructure opening away from the central light-emitting axis is greater than the depth of the microstructure opening close to the central light-emitting axis; Alternatively, the depth of the microstructure opening away from the central light-emitting axis is less than the depth of the microstructure opening close to the central light-emitting axis.

8. The display panel of claim 1, wherein, The display panel further comprises a pixel defining layer, and the pixel defining layer comprises a plurality of pixel openings, and the light-emitting element is located in the pixel opening; The pixel defining layer comprises a first defining layer and a second defining layer arranged in stack, and the second defining layer is located on the side of the first defining layer away from the substrate base plate; along the thickness direction of the display panel, the projection of the second defining layer is located in the projection of the first defining layer; The bottom angle of the first defining layer close to the light-emitting element is α1, and the bottom angle of the second defining layer close to the light-emitting element is α2, wherein α2≤α1.

9. The display panel of claim 8, wherein, 30°≤α2≤60°，30°≤α1≤90°。 10. The display panel of claim 1, wherein, The display panel further comprises a light shielding structure located between two adjacent light filtering structures; The light shielding structure comprises a first light shielding layer and a second light shielding layer arranged in stack, and the second light shielding layer is located on the side of the first light shielding layer away from the substrate base plate; along the thickness direction of the display panel, the projection of the second light shielding layer is located in the projection of the first light shielding layer; The bottom angle of the first light shielding layer close to the light filtering structure is α3, and the bottom angle of the second light shielding layer close to the light filtering structure is α4, wherein α4≤α3.

11. The display panel of claim 10, wherein, 30°≤α4≤60°，30°≤α3≤90°。 12. A display device, characterized by comprising: The display panel according to any one of claims 1-11.

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