Display panel and display device
By setting red, blue, and green chips with different top surface roughness on the display panel, and controlling the difference in their light emission angle within a reasonable range, the problem of color deviation in microdisplays is solved, and a more uniform display effect is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2026-04-07
AI Technical Summary
In microdisplays, color deviations occur at different angles when the red, blue, and green chips emit light, affecting the uniformity of the displayed image.
By setting different surface roughness of the top surfaces of the first sub-pixel element, the second sub-pixel element, and the third sub-pixel element on one side of the light-emitting surface of the display panel, the light emission angle difference is controlled within [-10%, +10%], ensuring the consistency of light emission from the red, blue, and green chips.
It improves the color uniformity of light emitted by the red, blue, and green chips in the microdisplay, thereby enhancing the quality and visual experience of the displayed image.
Smart Images
Figure CN121815853A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of display technology, and in particular to a display panel and display device. Background Technology
[0002] As the performance of Micro LED (micro-light-emitting diode) continues to be explored and related technologies develop, research on it is gradually extending into the display field. Micro LED displays utilize micron-sized inorganic LED devices as light-emitting pixels to achieve active-matrix display. From a display technology principle perspective, Micro LED and Organic Light-Emitting Diode (OLED) both belong to active-matrix display technologies. Unlike LCD and OLED displays, Micro LED displays use inorganic GaN and other LED light-emitting chips, composed of millions of tiny LEDs, each of which can emit light independently, offering advantages such as high brightness, high contrast, high color saturation, fast response time, and long lifespan. The pixel size of Micro LED displays is extremely small, typically between tens and hundreds of micrometers, thus enabling higher pixel density and more detailed image display. Furthermore, because each LED can be independently controlled, Micro LED displays can achieve true local dimming, providing higher contrast and deeper black levels.
[0003] Microdisplays are made by directly assembling a number of red, blue, and green chips (such as Micro LED chips) smaller than display pixels, according to the resolution requirements of the display. The different materials of the red, blue, and green chips result in inconsistent light emission angles, which can easily lead to color deviations at different angles when the red, blue, and green chips emit light in the microdisplay. This affects the uniformity of the color of the microchip display and results in a poor display image.
[0004] Therefore, in microchip displays, how to adjust or improve the light emission consistency of red, blue, and green chips on the same light-emitting surface, thereby improving the uniformity of the displayed image, has become one of the technical problems that urgently need to be solved by those skilled in the art. Summary of the Invention
[0005] To address the issue of color deviation occurring at different angles when red, blue, and green chips emit light in microdisplays, this invention proposes a display panel that can effectively improve the color uniformity of the display when red, blue, and green chips emit light in microdisplays.
[0006] In one embodiment of the present invention, a display panel is provided, comprising at least: a micro light-emitting diode pixel composed of a plurality of sub-pixel elements, wherein the plurality of sub-pixel elements include at least a first sub-pixel element, a second sub-pixel element, and a third sub-pixel element; the first sub-pixel element is configured to emit a first light beam of a first color and present a first emission angle; the second sub-pixel element is configured to emit a second light beam of a second color and present a second emission angle; and the third sub-pixel element is configured to emit a third light beam of a third color and present a third emission angle; wherein, on the light-emitting surface side of the display panel, the light-emitting surfaces of the first sub-pixel element and the second sub-pixel element or the third sub-pixel element have different top surface roughnesses, and the angle difference between the first emission angle, the second emission angle, and the third emission angle is [-10%, +10%].
[0007] In one embodiment of the present invention, a display device is provided, including a substrate on which a display panel as described above is electrically connected.
[0008] This invention addresses and improves product performance through product structure innovation.
[0009] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description
[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0011] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. Furthermore, the figures are descriptive outlines and are not drawn to scale.
[0012] Figure 1a and Figure 1b This is a cross-sectional schematic diagram of an embodiment of a conventional microdisplay panel; Figure 2 This is a cross-sectional schematic diagram of the first embodiment of the display panel in this invention; Figure 3 for Figure 2 The diagram shows the light emission of the display panel; and Figures 4 to 6 This is a schematic diagram comparing the coarsened areas of different sub-pixel elements in the display panel of the present invention.
[0013] Figure 7 This is a schematic diagram illustrating the differences in sidewall shapes between different sub-pixel elements in the display panel of the present invention.
[0014] Reference numerals: 1-Display panel; 2-Display device; 10, 10'-Substrate; 20-First sub-pixel element; 30-Second sub-pixel element; 40-Third sub-pixel element; α1-First emission angle; α2-Second emission angle, α3-Third emission angle; 22-First beam; 32-Second beam; 42-Third beam; 100, 100'-Bonding layer; H, H1, H2, H3-Thickness; Ra, Ra1, Ra2, Ra3-Top surface roughness; S1, S2, S3-Roughened area. Implementation
[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The technical features designed in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0016] This invention provides an embodiment in which a display panel includes at least: a micro light-emitting diode pixel composed of a plurality of sub-pixel elements, the plurality of sub-pixel elements including at least a first sub-pixel element, a second sub-pixel element and a third sub-pixel element; the first sub-pixel element is configured to emit a first light beam of a first color and present a first emission angle; the second sub-pixel element is configured to emit a second light beam of a second color and present a second emission angle; the third sub-pixel element is configured to emit a third light beam of a third color and present a third emission angle; the first sub-pixel element and the second sub-pixel element or the third sub-pixel element each have sidewalls with different angles, wherein, on the light-emitting surface side of the display panel, the light-emitting surfaces of the first sub-pixel element and the second sub-pixel element or the third sub-pixel element each have different top surface roughness, and the angle difference between the first emission angle, the second emission angle and the third emission angle is [-10%, +10%].
[0017] In some embodiments, preferably, on the light-emitting side of the display panel, the angle difference between the first emission angle, the second emission angle, and the third emission angle is [-20°, +20°].
[0018] In some embodiments, preferably, the top surface roughness of the first sub-pixel element and the second or third sub-pixel element is different, and the difference in top surface roughness between them is 20% to 200%.
[0019] In some embodiments, preferably, the first color is red, the second color is green, and the third color is blue. The wavelength of the first color is 600 to 750 nm, the wavelength of the second color is 450 to 570 nm, and the wavelength of the third color is 380 to 450 nm.
[0020] In some embodiments, preferably, the top surface roughness of the light-emitting surfaces of the second and third sub-pixel elements is 0.1 micrometers to 0.5 micrometers, and the top surface roughness of the light-emitting surface of the first sub-pixel element is less than the top surface roughness of the light-emitting surface of the second sub-pixel element.
[0021] In some embodiments, preferably, the top surface roughness of the light-emitting surface of the first sub-pixel element is 0.05 micrometers to 0.3 micrometers.
[0022] In some embodiments, preferably, the absolute value of the difference in top surface roughness between the light-emitting surfaces of the first sub-pixel element and the second sub-pixel element is R1, and the absolute value of the difference in top surface roughness between the light-emitting surfaces of the second sub-pixel element and the third sub-pixel element is R2, wherein R1 is more than 1.5 times R2.
[0023] In some embodiments, preferably, the roughened area of the light-emitting surface of the second sub-pixel element and / or the third sub-pixel element is smaller than the roughened area of the light-emitting surface of the first sub-pixel element.
[0024] In some embodiments, preferably, the ratio of the roughened area of the light-emitting surface of the second sub-pixel element and the third sub-pixel element to the roughened area of the light-emitting surface of the first sub-pixel element is 30% to 95%.
[0025] In some embodiments, preferably, the first sub-pixel element, the second sub-pixel element, and the third sub-pixel element have a semiconductor layer sequence, the semiconductor layer sequence including: a first semiconductor layer, a second semiconductor layer, and an active layer located between the two, the upper surface of the display panel is a light-emitting surface, the cross-sectional area of the first sub-pixel element gradually decreases from bottom to top, and the cross-sectional areas of the second and third sub-pixel elements gradually increase from bottom to top.
[0026] In some embodiments, preferably, the upper surface area of the first sub-pixel element is smaller than the lower surface area, and the upper surface area of the second and third sub-pixel elements is larger than the lower surface area.
[0027] In some embodiments, preferably, the upper surface area of the first sub-pixel element is smaller than the upper surface area of the second and third sub-pixel elements.
[0028] In some embodiments, preferably, the single-side length of the first sub-pixel element, the second sub-pixel element, and the third sub-pixel element is no greater than 80 micrometers, and the growth substrates of the three are removed.
[0029] In some embodiments, preferably, the first sub-pixel element is made of AlGaInP material, and the second and third sub-pixel elements are made of GaN material.
[0030] In some embodiments, preferably, the refractive index of the first sub-pixel element is greater than the refractive index of the second sub-pixel element and / or the third sub-pixel element.
[0031] In one embodiment of the present invention, a display device is provided, including a substrate on which a display panel as described above is electrically connected.
[0032] To better implement the technology of the present invention, the structure of the display panel involved in the present invention will be explained, and specific embodiments of the present invention will be illustrated with reference to the related schematic diagrams of the display panel.
[0033] Please see Figure 1a and Figure 1b , Figure 1a and Figure 1b This is a cross-sectional schematic diagram of an embodiment of a conventional microdisplay panel. A display panel typically contains several pixel units, each pixel unit including at least one set of red, green, and blue (RGB) sub-pixel units. For example... Figure 1a As shown, for ease of explanation, the illustrated embodiment uses at least one set of red, green, and blue (RGB) sub-pixel units as an example. In this invention, the RGB chip in the display panel is preferably a MicroLED (micro light-emitting diode / μLED). Generally, the light beam emitted by each pixel unit covers the light-emitting surface and the surrounding area of the sidewalls of the pixel unit, such as... Figure 1a As shown. For ease of labeling, Figure 1b The image only shows the light beam in the light-emitting area of the pixel unit.
[0034] like Figure 1b As shown, a conventional microdisplay device includes a substrate 10' and a display panel electrically connected to the substrate 10'. The substrate 10' contains a driving circuit. The substrate 10' and the display panel are electrically connected via a bonding layer 100'. The display panel includes at least one set of RGB microlight-emitting diodes (LEDs), which are arranged parallel to each other on the same side of the substrate 10' via the bonding layer 100'. The RGB LEDs have the same thickness H and the same top surface roughness Ra on the light-emitting side. The RGB LEDs are made of different materials and have different emission angles on the same light-emitting surface of the display device (the emission angles α1, α2, and α3 of each beam in the figure are different), resulting in color deviation. This causes uneven color of the image displayed by the microdisplay device (monitor), which in turn affects the display quality and viewing experience of the microdisplay.
[0035] Please refer to Figure 1. Figure 2 and Figure 3 .like Figure 2 As shown, in some embodiments, the display panel 1 includes at least a micro light-emitting diode pixel composed of a plurality of sub-pixel elements. The plurality of sub-pixel elements includes at least a first sub-pixel element 20, a second sub-pixel element 30, and a third sub-pixel element 40. The first sub-pixel element 20 is configured to emit a first light beam 22 of a first color and present a first emission angle α1 on the light-emitting surface of the display panel 1. The second sub-pixel element 30 is configured to emit a second light beam 32 of a second color and present a second emission angle α2 on the light-emitting surface of the display panel 1. The third sub-pixel element 40 is configured to emit a third light beam 42 of a third color and present a third emission angle α3 on the light-emitting surface of the display panel 1.
[0036] Figure 2 In the example, preferably, the first sub-pixel element 20 emits a first color of red, the second sub-pixel element 30 emits a second color of green, and the third sub-pixel element 40 emits a third color of blue. The wavelength of the first color is 600 to 750 nm, the wavelength of the second color is 450 to 570 nm, and the wavelength of the third color is 380 to 450 nm. The color order of the light beams emitted by the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 is not limited to this and can be changed or adjusted according to actual needs.
[0037] On the light-emitting side of the display panel 1, the light-emitting surfaces of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 each have different top surface roughness (Ra1, Ra2, and Ra3 in the figure), making the first emission angle α1, the second emission angle α2, and the third emission angle α3 basically the same and close in value, and the angle difference between the first emission angle α1, the second emission angle α2, and the third emission angle α3 is [-10%, +10%]. In the actual production of the display panel 1, the ideal or reference values of the light emission angles of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 may differ depending on the application scenario, etc. For example, in some actual products, the ideal or reference value of the light emission angles of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 is 120°, and the ranges of the first emission angle α1, the second emission angle α2, and the third emission angle α3 are each within 120°±10% or within 120°±20°.
[0038] In the actual production of display panel 1, due to unavoidable errors during the manufacturing process, the first emission angle α1, second emission angle α2, and third emission angle α3 corresponding to the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 are approximately equal, within the allowable error range. This ensures that the light emission of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 on the light-emitting surface side of display panel 1 is basically consistent, ensuring that the color uniformity between different pixels in display panel 1 is basically consistent, and the display of the same color is nearly consistent with no obvious color difference. In some embodiments, the allowable error range between different emission angles is within ±10% or within ±20°. In some specific embodiments, preferably, after the adjustment of the top surface roughness control of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40, the angle difference between the first emission angle α1, the second emission angle α2, and the third emission angle α3 is [-20°, +20°].
[0039] ISO 25178 Surface Properties (Measurement of Top Surface Roughness) is an international standard that specifies methods for evaluating top surface roughness. According to the definition and related technical information of surface properties in ISO 25178, the surfaces of machined parts, etc., possess complex shapes with varying heights, depths, and gaps. Among these, the surface unevenness with shallow depths and small intervals is called top surface roughness. The different tactile sensations felt by fingers or palms when touching machined parts are caused by surface unevenness. The appearance and feel of a product, to a certain extent, determine its added value (such as a sense of luxury and customer satisfaction). When parts come into contact with other objects, top surface roughness affects wear and sealing. Furthermore, when painting parts, top surface roughness also affects the penetration and thickness of the paint. Among the various evaluation parameters of surface properties in ISO 25178, Sa (arithmetic mean height) represents the arithmetic mean of the absolute values of the average height to the surface, and is a height parameter. In JIS B 0601-2001 (ISO 13565-1), the arithmetic mean height (Sa) is represented by Ra. In this application, the top surface roughness Ra1, Ra2, and Ra3 of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 correspond to Sa (arithmetic mean height) in the ISO 25178 standard.
[0040] Generally, the roughness of the top surface of the light-emitting surface is different for the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40. For example... Figure 2As shown, Ra1 ≠ Ra2, Ra1 ≠ Ra3. In some specific embodiments, further, the top surface roughnesses of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 are all different, and the difference in top surface roughness between the three is 20% to 200%. In the present invention, the meaning of "≈" in the numerical value is that the allowable error value is within ±10%. In actual products, according to different requirements, the top surface roughnesses of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 can be controlled and selected during the manufacturing process. In some other embodiments, as Figure 2 shown, Ra1 ≠ Ra2, Ra2 ≈ Ra3. Within the allowable error range, the top surface roughnesses of the second sub-pixel element 30 and the third sub-pixel element 40 are the same, the top surface roughnesses of the first sub-pixel element 20 and the second sub-pixel element 30 are different, and the difference in top surface roughness between the two is 20% to 200%.
[0041] In some embodiments, preferably, the top surface roughnesses Ra2 and Ra3 of the light-emitting surfaces of the second sub-pixel element 30 and the third sub-pixel element 40 are 0.1 μm to 0.5 μm respectively, and the top surface roughness Ra1 of the light-emitting surface of the first sub-pixel element 20 is less than the top surface roughness Ra2 of the light-emitting surface of the second sub-pixel element 20 (Ra1 < Ra2). The top surface roughness Ra1 of the light-emitting surface of the first sub-pixel element 20 is less than the top surface roughness Ra3 of the light-emitting surface of the third sub-pixel element 40 (Ra1 < Ra3). In the actual product of the display panel 1, the top surface roughness Ra1 of the light-emitting surface of the first sub-pixel element 20 is 70% to 85% of the top surface roughness Ra2 of the light-emitting surface of the second sub-pixel element 30.
[0042] In some embodiments, preferably, the top surface roughness Ra1 of the light-emitting surface of the first sub-pixel element 20 is 0.05 μm to 0.3 μm.
[0043] The absolute value of the difference in top surface roughness between the light-emitting surfaces of the first sub-pixel element 20 and the second sub-pixel element 30 is R1 (R1 = |Ra2 - Ra1|), and the absolute value of the difference in top surface roughness between the light-emitting surfaces of the second sub-pixel element 30 and the third sub-pixel element 40 is R2 (R2 = |Ra3 - Ra2|). R1 is 1.5 times or more of R2 (R1 ≥ R2 * 1.5). When R2 = 0, that is, when the top surface roughnesses of the light-emitting surfaces of the second sub-pixel element 30 and the third sub-pixel element 40 are the same, R1 can be infinite. At this time, it is only necessary that there is a difference in the top surface roughness of the light-emitting surface between the first sub-pixel element 20 and the second sub-pixel element 30 or the third sub-pixel element 40.
[0044] Figure 2In the example, on the light-emitting surface side of the display panel 1, within the allowable error range, the thicknesses of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 are substantially the same (as shown in the figure, H1≈H2≈H3). The thicknesses (H1, H2, H3) of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 refer to the vertical distance from the light-emitting surface (the front or positive side of the Micro LED chip) of each sub-pixel element to the electrode setting surface (the back or negative side of the Micro LED chip). It can be understood that the thickness of each pixel element refers to the thickness of the semiconductor structure (or the light-emitting stack) in each pixel element. The top surface roughnesses Ra1, Ra2, and Ra3 of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 are different, so that the light emission of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 is substantially the same.
[0045] Combined with Figure 2 See Figures 4 to 6 , on the light-emitting surface side of the display panel 1, the roughened area of the first sub-pixel element 20 is S1, the roughened area of the second sub-pixel element 30 is S2, and the roughened area of the third sub-pixel element 40 is S3. Generally, S1≠S2≠S3; further, in some embodiments, preferably, S1≠S2 and S1≠S3. The larger the roughened area of the surface on the light-emitting surface side of different sub-pixel elements, the larger the value of the corresponding light-emitting angle. In some embodiments, preferably, the roughened areas S2 and S3 of the light-emitting surfaces of the second sub-pixel element 30 and / or the third sub-pixel element 40 are respectively smaller than the roughened area S1 of the light-emitting surface of the first sub-pixel element 20 (S2<S1, S3<S1), such as S1≠S2, and S1≠S3. In some specific embodiments, according to the actual requirements of the product, within the allowable error range, the roughened areas of the light-emitting surfaces of the second sub-pixel element 30 and the third sub-pixel element 40 are substantially the same, such as S1≠S2, S2≈S3.
[0046] In some embodiments, preferably, the ratios of the roughened areas S2 and S3 of the light-emitting surfaces of the second sub-pixel element 30 and the third sub-pixel element 40 to the roughened area S1 of the light-emitting surface of the first sub-pixel element 20 are 30% to 95%. As shown in the figure, S2 = S1*(30% to 95%), S3 = S1*(30% to 95%).
[0047] Generally, the materials of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 are different. More specifically, the materials of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 are from different wavelength material families. This can be understood as the material families corresponding to different color gamuts (RGB) of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40. For example, the material of the first sub-pixel element 20 is from the first family, and the materials of the second sub-pixel element 30 and the third sub-pixel element 40 are from the second and third families, respectively, where the second and third families are the same or similar. Correspondingly, the top surface roughness Ra1, Ra2, and Ra3 of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 are different.
[0048] Due to factors such as manufacturing process and cost control, during the manufacturing of display panel 1, in some embodiments, preferably, the first sub-pixel element 20 is made of AlGaInP-based material, and correspondingly, the light emitted by the first sub-pixel element 20 is mainly high-brightness red. The second sub-pixel element 30 and the third sub-pixel element 40 are made of GaN-based material, and correspondingly, the light emitted by the second sub-pixel element 30 and the third sub-pixel element 40 is mainly green and blue, respectively. However, this is not limited to this. With improvements in manufacturing process, the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 can be made of different materials, and their top surface roughness is different, thereby achieving RGB light emission consistency in display panel 1.
[0049] In some embodiments, the refractive index of the first sub-pixel element 20 is further greater than that of the second sub-pixel element 30 and / or the third sub-pixel element 40. The light emission of each pixel element is adjusted in conjunction with the materials of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40, thereby improving the optical performance and stability of each pixel element and achieving RGB light emission consistency in the display panel 1.
[0050] Please refer to it again. Figure 2In some embodiments, the display device 2 includes a substrate 10 and a display panel 1 having the aforementioned structure, electrically connected to the substrate 10. As shown in the figure, in the display panel 1, the electrode sides of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 are electrically connected to the substrate 10 via a bonding layer 100 and are disposed on the same side of the substrate 10. In a preferred embodiment, the substrate 10 is a TFT BP substrate. Preferably, the vertical spacing between the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 and the substrate 10 is substantially the same, such that the light-emitting surfaces of the first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 remain on the same plane, ensuring that the chromaticity of sub-pixel elements of different colors in the display device 2 remains uniform. In the actual production of the display device 2, the first sub-pixel element 20, the second sub-pixel element 30 and the third sub-pixel element 40 are arranged at equal or non-equal intervals along the horizontal direction on the substrate 10, and the distances from each to the substrate 10 along the vertical direction are different, and height differences are allowed without affecting the consistency of light output.
[0051] The present invention provides a display device and display panel that, compared with existing microdisplays, differentiates the top surface roughness of red (R), green (G), and blue (B) chips, so that the emission angles of the red, green, and blue chips on the same light-emitting surface remain basically consistent within the allowable error range, thereby achieving the purpose of controlling the light pattern and achieving consistent light emission. This ensures the imaging uniformity of different angles on the same display surface in the display device and display panel, and improves the display quality.
[0052] Please refer to Figure 7 In some embodiments, the difference from other embodiments is that a display panel includes at least: a micro light-emitting diode pixel composed of a plurality of sub-pixel elements, the plurality of sub-pixel elements including at least a first sub-pixel element 20, a second sub-pixel element 30 and a third sub-pixel element 40; the first sub-pixel element 20 is configured to emit a first light beam of a first color and present a first emission angle; the second sub-pixel element 30 is configured to emit a second light beam of a second color and present a second emission angle; the third sub-pixel element 40 is configured to emit a third light beam of a third color and present a third emission angle; the first sub-pixel element 20 and the second sub-pixel element 30 or the third sub-pixel element 40 each have sidewalls with different angles, wherein, on the light-emitting surface side of the display panel, the light-emitting surfaces of the first sub-pixel element 20 and the second sub-pixel element 30 or the third sub-pixel element 40 each have different top surface roughness, and the angle difference between the first emission angle α1, the second emission angle α2 and the third emission angle α3 is [-10%, +10%].
[0053] The first sub-pixel element 20, the second sub-pixel element 30, and the third sub-pixel element 40 each have a semiconductor layer sequence, which includes a first semiconductor layer, a second semiconductor layer, and an active layer located between them. The upper surface of the display panel is the light-emitting surface. The cross-sectional area of the first sub-pixel element 20 gradually decreases from bottom to top, while the cross-sectional areas of the second sub-pixel element 30 and the third sub-pixel element 40 gradually increase from bottom to top. This gradual increase refers to an overall increasing trend, meaning that more than 80% of the semiconductor layer sequence shows an increasing trend. The upper surface area of the first sub-pixel element 20 is smaller than its lower surface area, while the upper surface areas of the second sub-pixel element 30 and the third sub-pixel element 40 are larger than their lower surface areas. The upper surface area of the first sub-pixel element 20 is smaller than the upper surface area of the second sub-pixel element 30 and the third sub-pixel element 40.
[0054] In this application, the side length of the first sub-pixel element 20, the second sub-pixel element 30 and the third sub-pixel element 40 is no greater than 80 micrometers for better application, and the growth substrates of the three are removed.
[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A display panel, characterized in that: At least including A miniature light-emitting diode pixel composed of multiple sub-pixel elements, wherein the multiple sub-pixel elements include at least a first sub-pixel element, a second sub-pixel element, and a third sub-pixel element; The first sub-pixel element is configured to emit a first beam of a first color and present a first emission angle; The second sub-pixel element is configured to emit a second beam of a second color, presenting a second emission angle; The third sub-pixel element is configured to emit a third beam of a third color, presenting a third emission angle; Among them, on the light-emitting side of the display panel, the first sub-pixel element and the second sub-pixel element or the third sub-pixel element each have sidewalls with different angles, and the angle difference between the first light-emitting angle, the second light-emitting angle and the third light-emitting angle is [-10%, +10%].
2. The display panel according to claim 1, characterized in that: On the light-emitting side of the display panel, the angle difference between the first light-emitting angle, the second light-emitting angle, and the third light-emitting angle is [-20°, +20°].
3. The display panel according to claim 1, characterized in that: The top surface roughness of the first sub-pixel element and the second sub-pixel element or the third sub-pixel element is different, and the difference in top surface roughness between the two is 20% to 200%.
4. The display panel according to claim 1, characterized in that: The top surface roughness of the light-emitting surfaces of the second sub-pixel element and the third sub-pixel element is 0.1 micrometer to 0.5 micrometer, and the top surface roughness of the light-emitting surface of the first sub-pixel element is less than the top surface roughness of the light-emitting surface of the second sub-pixel element.
5. The display panel according to claim 1, characterized in that: The surface roughness of the top surface of the light-emitting surface of the first sub-pixel element is 0.05 micrometers to 0.3 micrometers.
6. The display panel according to claim 1, characterized in that: The absolute value of the difference in top surface roughness between the light-emitting surfaces of the first sub-pixel element and the second sub-pixel element is R1, and the absolute value of the difference in top surface roughness between the light-emitting surfaces of the second sub-pixel element and the third sub-pixel element is R2, wherein R1 is more than 1.5 times R2.
7. The display panel according to claim 1, characterized in that: The roughened area of the light-emitting surface of the second sub-pixel element and / or the third sub-pixel element is smaller than the roughened area of the light-emitting surface of the first sub-pixel element.
8. The display panel according to claim 1, characterized in that: The first sub-pixel element, the second sub-pixel element, and the third sub-pixel element have a semiconductor layer sequence, which includes a first semiconductor layer, a second semiconductor layer, and an active layer located between them. The upper surface of the display panel is a light-emitting surface. The cross-sectional area of the first sub-pixel element gradually decreases from bottom to top, while the cross-sectional areas of the second and third sub-pixel elements gradually increase from bottom to top.
9. The display panel according to claim 8, characterized in that: The upper surface area of the first sub-pixel element is smaller than the lower surface area, while the upper surface area of the second and third sub-pixel elements is larger than the lower surface area.
10. The display panel according to claim 8, characterized in that: The upper surface area of the first sub-pixel element is smaller than the upper surface area of the second and third sub-pixel elements.
11. The display panel according to claim 1, characterized in that: The single-side length of the first sub-pixel element, the second sub-pixel element, and the third sub-pixel element is no greater than 80 micrometers, and the growth substrates of the three elements are removed.
12. The display panel according to claim 1, characterized in that: The refractive index of the first sub-pixel element is greater than that of the second sub-pixel element and / or the third sub-pixel element.
13. The display panel according to claim 1, characterized in that: The first color is red, the second color is green, and the third color is blue; the wavelength of the first color is 600 to 750 nm, the wavelength of the second color is 450 to 570 nm, and the wavelength of the third color is 380 to 450 nm.
14. The display panel according to claim 1, characterized in that: The first sub-pixel element is made of AlGaInP material, while the second and third sub-pixel elements are made of GaN material.
15. A display device, characterized in that: It includes a substrate and a display panel as described in any one of claims 1 to 14 disposed on the substrate.