Micro-display pixel unit, micro-display panel and electronic device

Abstract

A micro-display pixel unit, a micro-display panel and an electronic device. The micro-display pixel unit comprises: a drive backplane; and a light-emitting structure located on one side of the drive backplane, wherein the light-emitting structure comprises at least two light-emitting mesas, the at least two light-emitting mesas being arranged at intervals in a vertical direction and being separately electrically connected to the drive backplane; each light-emitting mesa comprises a top surface away from the drive backplane and a bottom surface close to the drive backplane; and the area of the top surface of at least one of the at least two light-emitting mesas is greater than the area of the bottom surface, and when the contour of the bottom surface of each light-emitting mesa is vertically projected onto the top surface, the projection falls within the contour range of the top surface. The area of the top surface of at least one of the at least two light-emitting mesas is greater than the area of the bottom surface, and when the contour of the bottom surface of each light-emitting mesa is vertically projected onto the top surface, the projection falls within the contour range of the top surface, so that the light-extraction efficiency can be improved, thereby improving a display effect.

Description

Micro display pixel unit, micro display panel and electronic device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 27, 2024, with application number 2024102190790 and invention name “Microdisplay pixel unit, microdisplay panel and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the field of micro-display technology, and in particular to a micro-display pixel unit, a micro-display panel and an electronic device. Background Art

[0003] Inorganic micro-pixel light-emitting diodes, also known as micro-LEDs (Micro LEDs or μ-LEDs), have become increasingly important since they are being used in a variety of applications, including self-luminous micro-displays, visible light communications, and optogenetics. Compared to traditional LEDs, Micro LEDs offer improved strain relaxation, better light extraction efficiency, uniform current spreading, and higher output performance. Micro LEDs also offer improved thermal effects, faster response times, a wider operating temperature range, higher resolution, a wider color gamut, higher contrast, lower power consumption, and higher current density.

[0004] However, there are still many problems with the micro display panels in the prior art.

[0005] Summary of the Invention

[0006] The technical problem solved by the present invention is to provide a micro display pixel unit, a micro display panel and an electronic device to improve the display effect.

[0007] To solve the above-mentioned problem, the technical solution of the present invention provides a micro-display pixel unit, comprising: a driving backplane; a light-emitting structure located on one side of the driving backplane, the light-emitting structure comprising at least two light-emitting mesas, the at least two light-emitting mesas being spaced apart in a vertical direction and electrically connected to the driving backplane respectively; the light-emitting mesas comprising a top surface away from the driving backplane and a bottom surface close to the driving backplane, the top surface area of ​​at least one of the at least two light-emitting mesas being larger than the bottom surface area, and the contour of the bottom surface of the light-emitting mesas, when vertically projected onto the top surface, being located within the contour range of the top surface.

[0008] Optionally, the area of ​​the top surface of the uppermost light-emitting mesa among the at least two light-emitting mesas is larger than the area of ​​the bottom surface, and the outline of the bottom surface of the uppermost light-emitting mesa, when vertically projected onto the top surface, is within the outline range of the top surface.

[0009] Optionally, the area of ​​the top surface of the light-emitting mesa adjacent to the topmost light-emitting mesa among the at least two light-emitting mesas is larger than the area of ​​the bottom surface, and the outline of the bottom surface of the light-emitting mesa adjacent to the topmost light-emitting mesa, when vertically projected onto the top surface, is within the outline range of the top surface.

[0010] Optionally, among the at least two light-emitting mesas, except for the light-emitting mesas at the bottom layer, whose top surface area is smaller than the bottom surface area, the top surfaces of the remaining light-emitting mesas are larger than the bottom surface area, and the contours of the bottom surfaces of the remaining light-emitting mesas, when vertically projected onto the top surface, are all within the contour range of the top surface.

[0011] Optionally, the area of ​​the top surface of the bottom light-emitting mesa among the at least two light-emitting mesas is larger than the area of ​​the bottom surface, and the outline of the bottom surface of the bottom light-emitting mesa is vertically projected onto the top surface and is within the outline range of the top surface.

[0012] Optionally, a reflective layer is formed on the bottom surface and sidewalls of the light-emitting mesa at the bottom layer.

[0013] Optionally, it also includes: an electrical connection structure, which is arranged on the periphery of the light-emitting table; the electrical connection structure includes at least one top electrical connection structure and at least one bottom electrical connection structure, the at least one top electrical connection structure is electrically connected to the top of the light-emitting table, and each of the bottom electrical connection structures is electrically connected to the bottom of one light-emitting table.

[0014] Optionally, the top surface and the bottom surface of the at least two light-emitting mesas are both circular in shape, and the at least two light-emitting mesas are coaxially arranged in a vertical direction.

[0015] Optionally, it also includes: an electrical connection structure, which is arranged on the periphery of the light-emitting table; the electrical connection structure includes at least one top electrical connection structure and at least one bottom electrical connection structure, the at least one top electrical connection structure is electrically connected to the top of the light-emitting table, and each of the bottom electrical connection structures is electrically connected to the bottom of one light-emitting table.

[0016] Optionally, it also includes: conductive layers located on the upper and lower sides of the light-emitting mesa, the conductive layers including a top conductive layer arranged above the light-emitting mesa, and a bottom conductive layer arranged below the light-emitting mesa; the at least one top electrical connection structure is electrically connected to the top conductive layer, and each of the bottom electrical connection structures is electrically connected to one bottom conductive layer.

[0017] Optionally, an insulating medium is filled between adjacent light-emitting mesas.

[0018] Optionally, it also includes: a pixel isolation structure, which surrounds the at least two light-emitting tables, and the inner wall of the pixel isolation structure is an inclined slope. When part of the light emitted by the at least two light-emitting tables hits the pixel isolation structure, the pixel isolation structure is used to reflect the light in a direction away from the driving backplane.

[0019] Optionally, the at least two light-emitting mesas include: a first light-emitting mesas, a second light-emitting mesas and a third light-emitting mesas; wherein the second light-emitting mesas is arranged above the first light-emitting mesas, and a portion of the first light-emitting mesas is covered by the second light-emitting mesas; the third light-emitting mesas is arranged above the second light-emitting mesas, and a portion of the second light-emitting mesas is covered by the third light-emitting mesas.

[0020] Optionally, the top surface of the first light-emitting mesa, the top surface of the second light-emitting mesa, and the third light-emitting mesa are in a conical structure or an inverted conical structure.

[0021] Optionally, the first light-emitting table, the second light-emitting table and the third light-emitting table all have a symmetrical structure; the symmetrical structure includes: a first vertical symmetry plane along the length direction; a second vertical symmetry plane along the width direction; and a vertical center line formed by the intersection of the first vertical symmetry plane and the second vertical symmetry plane.

[0022] Optionally, the vertical center line of the first light-emitting mesa and the vertical center line of the second light-emitting mesa are not aligned with each other; the vertical center line of the first light-emitting mesa and the vertical center line of the third light-emitting mesa are not aligned with each other; the vertical center line of the second light-emitting mesa and the vertical center line of the third light-emitting mesa are not aligned with each other.

[0023] Optionally, the first light-emitting mesa is not covered by any part of the third light-emitting mesa.

[0024] Optionally, it further includes: a bottom connecting mesa located between the light-emitting mesa at the bottom layer and the driving backplane, wherein the bottom connecting mesa is electrically connected to the driving backplane and the light-emitting mesa at the bottom layer respectively.

[0025] Optionally, the material of the bottom connection mesa includes a metal material; the metal material includes one or more of Al, Au, Rh, Ag, Cr, Ti, Pt, Sn, Cu, AuSn and TiW.

[0026] Optionally, it also includes: conductive layers located on the upper and lower sides of the light-emitting mesa, the conductive layers including a top conductive layer arranged above the light-emitting mesa, and a bottom conductive layer arranged below the light-emitting mesa; the at least one top electrical connection structure is electrically connected to the top conductive layer, and each of the bottom electrical connection structures is electrically connected to one bottom conductive layer.

[0027] Optionally, the material of the conductive layer includes a transparent material; the transparent material includes: a combination of one or more of ITO, FTO, and AZO.

[0028] Optionally, it further includes: a micro lens arranged above the topmost light-emitting table.

[0029] Optionally, a bottom area of ​​the microlens is larger than a larger one of a top surface and a bottom surface of the light-emitting mesa.

[0030] Optionally, the thickness of the microlens is less than or equal to 10 μm.

[0031] Optionally, the thickness of the light-emitting mesa ranges from 0.3 μm to 3.5 μm; the bottom diameter of the light-emitting mesa ranges from 0.5 μm to 50 μm.

[0032] Correspondingly, the technical solution of the present invention further provides a micro display panel, comprising: a micro display array composed of a plurality of micro display pixel units as described in any one of the technical solutions above.

[0033] Optionally, the length range of the micro display panel is 500 μm to 50,000 μm; the resolution of the micro display array in the micro display panel is one of 320*240, 640*480, 1920*1080 and 2560*1440.

[0034] Correspondingly, the technical solution of the present invention further provides an electronic device, comprising: at least one micro display panel as described in any one of the technical solutions above.

[0035] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0036] In the micro-display pixel unit of the technical solution of the present invention, the top surface area of ​​at least one of the at least two light-emitting mesas is larger than the bottom surface area, and the contour of the bottom surface of the light-emitting mesa, when perpendicularly projected onto the top surface, lies within the contour of the top surface. This can increase the light extraction efficiency (LEE), thereby enhancing the display effect.

[0037] Furthermore, a reflective layer is formed on the bottom surface and sidewalls of the lowest light-emitting mesa, which is used to reflect light away from the driving backplane, thereby improving light extraction efficiency.

[0038] Furthermore, the display further includes an electrical connection structure disposed on the periphery of the light-emitting mesa. The electrical connection structure not only electrically connects the light-emitting mesa to the driving backplane, but also, by being disposed on the periphery of the light-emitting mesa, reflects light emitted by the light-emitting mesa, thereby preventing crosstalk between adjacent pixel units, improving luminous efficiency, and thereby enhancing display effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] FIG1 is a schematic top view of a micro display pixel unit according to an embodiment of the present invention;

[0040] FIG2 is a schematic diagram of the cross-sectional structure of line aa in FIG1 ;

[0041] FIG3 is a schematic cross-sectional view of line bb in FIG1 ;

[0042] FIG4 is a schematic cross-sectional view of the structure along line cc in FIG1 ;

[0043] FIG5 is a schematic cross-sectional view of a modified embodiment of the micro-display pixel unit of the embodiment shown in FIG1 ;

[0044] FIG6 is a schematic cross-sectional view of another modified embodiment of the micro-display pixel unit of the embodiment shown in FIG1 ;

[0045] FIG7 is a schematic structural diagram of a micro display array composed of several micro display pixel units according to the embodiment shown in FIG1 ;

[0046] FIG8 is a schematic cross-sectional view of line aa in FIG7 ;

[0047] FIG9 is a schematic diagram of the three-dimensional structure of a micro display pixel unit according to another embodiment of the present invention;

[0048] FIG10 is a schematic diagram of the top structure of FIG9;

[0049] FIG11 is a schematic cross-sectional view of the structure along line a'-a' in FIG10;

[0050] FIG12 is a schematic cross-sectional view of the structure along line b'-b' in FIG10;

[0051] FIG13 is a schematic cross-sectional view of the structure along line c'-c' in FIG10;

[0052] FIG14 is a schematic cross-sectional view of the structure along line d'-d' in FIG10;

[0053] FIG15 is a schematic perspective structural diagram of a modified embodiment of the micro-display pixel unit of the embodiment shown in FIG9 ;

[0054] FIG16 is a schematic structural diagram of a micro-display array composed of several micro-display pixel units according to the embodiment shown in FIG9 ;

[0055] FIG17 is a schematic cross-sectional view of the structure along line aa in FIG16 ;

[0056] FIG18 is a schematic top view of a micro display pixel unit according to another embodiment of the present invention;

[0057] FIG19 is a schematic cross-sectional view of the structure along line a"-a" in FIG18;

[0058] FIG20 is a schematic cross-sectional view of the structure along line b"-b" in FIG18;

[0059] FIG21 is a schematic structural diagram of a modified embodiment of the micro display pixel unit of the embodiment shown in FIG18 ;

[0060] FIG22 is a schematic structural diagram of a micro-display array composed of several micro-display pixel units according to the embodiment shown in FIG18 ;

[0061] FIG23 is a schematic diagram of the cross-sectional structure along line aa in FIG22 . DETAILED DESCRIPTION

[0062] As described in the background art, the prior art micro display panels still have many problems, which will be described in detail below.

[0063] In the prior art, to achieve color display, light-emitting mesas of different colors are placed on a single pixel unit. To reduce the pixel area, these light-emitting mesas are stacked vertically. In existing color display panels, the light-emitting mesas are typically larger at one end and smaller at the other. The smaller end is typically the light-emitting end, resulting in a smaller light-emitting area. This results in low light extraction efficiency, which affects the display quality.

[0064] On this basis, the present invention provides a micro-display pixel unit, a micro-display panel, and an electronic device, wherein the top surface area of ​​at least one of the at least two light-emitting mesas is larger than the bottom surface area, and the contour of the bottom surface of the light-emitting mesas, when vertically projected onto the top surface, is within the contour range of the top surface, thereby increasing the light extraction rate and thereby improving the display effect.

[0065] To make the above-mentioned purposes, features and advantages of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. 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 ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0066] In the description of the present invention, it should be understood that the terms "upper," "lower," "top," and "bottom" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate description and simplify the present invention. They are not intended to indicate or imply that the positions or elements referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations of the present invention. Furthermore, the terms "first" and "second" are used solely to distinguish an entity or operation from another entity or operation and do not require or imply any actual relationship, order, or relative importance between these entities or operations.

[0067] Figure 1 is a schematic top view of the structure of a micro-display pixel unit according to an embodiment of the present invention; Figure 2 is a schematic cross-sectional structure diagram along line aa in Figure 1; Figure 3 is a schematic cross-sectional structure diagram along line bb in Figure 1; Figure 4 is a schematic cross-sectional structure diagram along line cc in Figure 1; Figure 5 is a schematic cross-sectional structure diagram of a modified embodiment of the micro-display pixel unit according to the embodiment shown in Figure 1; Figure 6 is a schematic cross-sectional structure diagram of another modified embodiment of the micro-display pixel unit according to the embodiment shown in Figure 1; Figure 7 is a schematic structural diagram of a micro-display array composed of a plurality of micro-display pixel units according to the embodiment shown in Figure 1; and Figure 8 is a schematic cross-sectional structure diagram along line aa in Figure 7.

[0068] Referring to Figures 1 to 4 , a micro-display pixel unit includes: a driving backplane 120; a light-emitting structure located on one side of the driving backplane 120, the light-emitting structure including at least two light-emitting mesas 210, the at least two light-emitting mesas 210 being spaced apart in a vertical direction and electrically connected to the driving backplane 120 respectively; the light-emitting mesas 210 including a top surface away from the driving backplane 120 and a bottom surface close to the driving backplane 120, the top surface area of ​​at least one of the at least two light-emitting mesas 210 being larger than the bottom surface area, and the contour of the bottom surface of the light-emitting mesa 210, when vertically projected onto the top surface, being located within the contour of the top surface.

[0069] The top surface area of ​​at least one of the at least two light-emitting mesas 210 is larger than the bottom surface area, and the contour of the bottom surface of the light-emitting mesa 210, when vertically projected onto the top surface, is within the contour range of the top surface. This can increase the light extraction rate and thus enhance the display effect.

[0070] In some embodiments, the micro display pixel unit is a Micro LED pixel unit.

[0071] In some embodiments, the micro-display pixel unit further includes a conductive layer 220 located above and below each light-emitting mesa 210. The conductive layer 220 includes a top conductive layer 221 disposed above each light-emitting mesa 210 and a bottom conductive layer 222 disposed below each light-emitting mesa 210. The top conductive layer 221 is electrically connected to the top surface of the light-emitting mesa 210, and the bottom conductive layer 222 is electrically connected to the bottom surface of the light-emitting mesa 210. The conductive layer 220 is used to supply power to the light-emitting mesa 210 to illuminate the corresponding light-emitting mesa 210.

[0072] 1 to 4 , in some embodiments, at least two light-emitting mesas 210 include a first light-emitting mesa 211 , a second light-emitting mesa 212 , and a third light-emitting mesa 213 , wherein the first light-emitting mesa 211 , the second light-emitting mesa 212 , and the third light-emitting mesa 213 are stacked vertically from bottom to top.

[0073] In some embodiments, the first light-emitting mesa 211 emits red light, the second light-emitting mesa 212 emits green light, and the third light-emitting mesa 213 emits blue light.

[0074] In some embodiments, the light-emitting mesas 210 in different layers of a micro-display pixel unit emit light of the same color. For example, the first light-emitting mesa 211, the second light-emitting mesa 212, and the third light-emitting mesa 213 all emit blue light; or the first light-emitting mesa 211, the second light-emitting mesa 212, and the third light-emitting mesa 213 all emit green light or red light.

[0075] In some embodiments, the number of the light-emitting mesas 210 included in the at least two light-emitting mesas 210 can be 2 or 3 or more.

[0076] Continuing with Figures 2 to 4 , in some embodiments, two adjacent light-emitting mesas 210 of the at least two light-emitting mesas 210 stacked vertically are spaced apart from each other, i.e., the first light-emitting mesas 211 are spaced apart from the second light-emitting mesas 212, and the second light-emitting mesas 212 are spaced apart from the third light-emitting mesas 213. Furthermore, the spacing between two adjacent light-emitting mesas 210 in the vertical direction is equal, i.e., the spacing between the first light-emitting mesas 211 and the second light-emitting mesas 212 is equal to the spacing between the second light-emitting mesas 212 and the third light-emitting mesas 213.

[0077] In some embodiments, the intervals between two adjacent light-emitting mesas 210 in the vertical direction can be set to be unequal as needed.

[0078] 2 to 4 , in some embodiments, the top and bottom surfaces of at least two light-emitting mesas 210 are circular, that is, the top and bottom surfaces of the first light-emitting mesa 211 , the second light-emitting mesa 212 , and the third light-emitting mesa 213 are circular.

[0079] In some embodiments, the top surface area of ​​the bottommost light-emitting mesa 210 of the at least two light-emitting mesas 210 is larger than the bottom surface area, and the contour of the bottom surface of the bottommost light-emitting mesa 210, when perpendicularly projected onto the top surface, lies within the contour of the top surface. Continuing with FIG. 2 , in one specific embodiment, the top surface area of ​​the first light-emitting mesa 211 at the bottommost layer is larger than the bottom surface area, the top surface area of ​​the third light-emitting mesa 213 at the topmost layer is smaller than the bottom surface area, and the top surface area of ​​the second light-emitting mesa 212 at the middle layer is smaller than the bottom surface area.

[0080] In some embodiments, the top surface area of ​​the topmost light-emitting mesa 210 of the at least two light-emitting mesas 210 is larger than the bottom surface area, and the contour of the bottom surface of the topmost light-emitting mesa 210, when perpendicularly projected onto the top surface, lies within the contour of the top surface. Referring to FIG5 , in one specific embodiment, the top surface area of ​​the first light-emitting mesa 211 at the bottom layer is smaller than the bottom surface area, the top surface area of ​​the third light-emitting mesa 213 at the top layer is larger than the bottom surface area, and the top surface area of ​​the second light-emitting mesa 212 at the middle layer is smaller than the bottom surface area.

[0081] In some embodiments, the top surface area of ​​the light-emitting mesa 210 adjacent to the topmost light-emitting mesa 210 of the at least two light-emitting mesas 210 is larger than the bottom surface area, and the bottom surface contour of the light-emitting mesa 210 adjacent to the topmost light-emitting mesa 210, when perpendicularly projected onto the top surface, lies within the contour of the top surface. Referring to FIG6 , in one specific embodiment, the top surface area of ​​the first light-emitting mesa 211 at the bottommost layer is smaller than the bottom surface area, the top surface area of ​​the third light-emitting mesa 213 at the topmost layer is smaller than the bottom surface area, and the top surface area of ​​the second light-emitting mesa 212 at the middle layer is larger than the bottom surface area.

[0082] In some embodiments, of the at least two light-emitting mesas 210, except for the bottommost light-emitting mesa 210, whose top surface area is smaller than the bottom surface area, the top surfaces of the remaining light-emitting mesas 210 are larger than the bottom surface area, and the contours of the bottom surfaces of the remaining light-emitting mesas 210, when perpendicularly projected onto the top surface, are all within the contour of the top surface. In one specific embodiment, the top surface area of ​​the first light-emitting mesa 211 at the bottommost layer is smaller than the bottom surface area, the top surface area of ​​the third light-emitting mesa 213 at the topmost layer is larger than the bottom surface area, and the top surface area of ​​the second light-emitting mesa 212 at the middle layer is larger than the bottom surface area.

[0083] In some embodiments, the top surface areas of the first light-emitting mesa 211 , the second light-emitting mesa 212 , and the third light-emitting mesa 213 are all larger than the bottom surface areas.

[0084] Continuing with reference to FIG. 2 to FIG. 4 , in some embodiments, at least two light-emitting mesas 210 are coaxially arranged in the vertical direction, and the projections of each light-emitting mesas 210 along the vertical direction overlap. That is, the first light-emitting mesas 211, the second light-emitting mesas 212, and the third light-emitting mesas 213 are coaxially arranged in the vertical direction, and the projections of the first light-emitting mesas 211, the second light-emitting mesas 212, and the third light-emitting mesas 213 along the vertical direction overlap.

[0085] In some embodiments, the sizes of the light-emitting mesas 210 may be different, and the projections of the light-emitting mesas 210 along the vertical direction may partially overlap.

[0086] Continuing with Figures 2 to 4 , in some embodiments, the micro-display pixel unit further includes an electrical connection structure 230 electrically connected to the conductive layer 220 of the micro-display pixel unit for illuminating the light-emitting mesa 210. The electrical connection structure 230 includes at least one top electrical connection structure 231 and at least one bottom electrical connection structure 232. At least one top electrical connection structure 231 electrically connects the top conductive layer 221 of each light-emitting mesa 210, while each bottom electrical connection structure 232 electrically connects the bottom conductive layer 222 of a corresponding light-emitting mesa 210. The bottom of the top electrical connection structure 231 is bonded to the driving backplane 120 but is not directly electrically connected to the driving backplane 120. The top electrical connection structure 231 can electrically connect the top conductive layer 221 to the negative terminal of an external power source. The bottom of each bottom electrical connection structure 232 is bonded to and electrically connected to the driving backplane 120. Each bottom electrical connection structure 232 electrically connects the bottom conductive layer 222 to the positive terminal of an external power source. The electrical connection structures 230 are disposed around the periphery of the light-emitting mesa 210. They not only electrically connect the light-emitting mesa 210 to the driver backplane 120, but also reflect light emitted by the light-emitting mesa 210, preventing crosstalk between adjacent pixels 200, improving luminous efficiency, and thereby enhancing display quality.

[0087] Please continue to refer to Figure 1. In some embodiments, at least one bottom electrical connection structure 232 includes a first bottom electrical connection structure 232a and a second bottom electrical connection structure 232b. The first bottom electrical connection structure 232a is located in the direction of line aa in Figure 2, and the second bottom electrical connection structure 232b is located in the direction of line bb in Figure 2; the top electrical connection structure 231 is located in the direction of line cc and line dd in Figure 2.

[0088] Continuing with reference to Figures 2 to 4, in some embodiments, the bottom conductive layer 222 includes a first bottom conductive layer 222a, a second bottom conductive layer 222b, and a third bottom conductive layer 222c. The first bottom conductive layer 222a is located at the bottom of the first light-emitting mesa 211, the second bottom conductive layer 222b is located at the bottom of the second light-emitting mesa 212, and the third bottom conductive layer 222c is located at the bottom of the third light-emitting mesa 213. The top conductive layer 221 includes a first top conductive layer 221a, a second top conductive layer 221b, and a third top conductive layer 221c. The first top conductive layer 221a is located on top of the first light-emitting mesa 211, the second top conductive layer 221b is located on top of the second light-emitting mesa 212, and the third top conductive layer 221c is located on top of the third light-emitting mesa 213.

[0089] Continuing with reference to FIG. 2 , in some embodiments, one end of the second bottom conductive layer 222 b extends to the first bottom electrical connection structure 232 a and is electrically connected to the first bottom electrical connection structure 232 a .

[0090] Continuing with reference to FIG. 3 , in some embodiments, one end of the third bottom conductive layer 222 c extends to the second bottom electrical connection structure 232 b and is electrically connected to the second bottom electrical connection structure 232 b .

[0091] Continuing with reference to FIG. 4 , in some embodiments, ends of the first top conductive layer 221 a , the second top conductive layer 221 b , and the third top conductive layer 221 c all extend to the top electrical connection structure 231 and are electrically connected to the top electrical connection structure 231 .

[0092] Please continue to refer to Figures 2 to 4. In some embodiments, one top electrical connection structure 231 can be electrically connected to all top conductive layers 221 (the first top conductive layer 221a, the second top conductive layer 221b, and the third top conductive layer 221c), and one bottom electrical connection structure 232 is correspondingly electrically connected to one bottom conductive layer 222 (the first bottom conductive layer 222a, the second bottom conductive layer 222b, or the third bottom conductive layer 222c).

[0093] Continuing with FIG. 1 , in some embodiments, there are four top electrical connection structures 231 , two of which are arranged along the cc line and the other two along the dd line. All four top electrical connection structures 231 are electrically connected to all light-emitting mesas 210 (the first light-emitting mesa 211 , the second light-emitting mesa 212 , and the third light-emitting mesa 213 ). The four top electrical connection structures 231 , the first bottom electrical connection structure 232 a , and the second bottom electrical connection structure 232 b are spaced apart and disposed around the periphery of the light-emitting mesas 210 (the first light-emitting mesa 211 , the second light-emitting mesa 212 , and the third light-emitting mesa 213 ). The gaps between adjacent electrical connection structures 230 and the gaps between adjacent light-emitting mesas 210 are filled with an insulating medium.

[0094] Continuing with Figures 2 to 4 , in some embodiments, the micro-display pixel unit further includes a micro-lens 260 , each of which covers a micro-display pixel area. The bottom diameter of each micro-lens 260 is larger than the larger of the top and bottom surfaces of the light-emitting mesas 210 (the first light-emitting mesa 211 , the second light-emitting mesa 212 , and the third light-emitting mesa 213 ). The thickness of each micro-lens 260 is less than or equal to 10 μm.

[0095] In some embodiments, the material of the microlens 260 is selected from silicon dioxide, photoresist, and the like.

[0096] In some embodiments, the thickness of the light-emitting mesa 210 ranges from 0.3 μm to 3.5 μm; the bottom diameter of the light-emitting mesa 210 ranges from 0.5 μm to 50 μm.

[0097] Continuing with reference to FIG. 2 to FIG. 4 , in some embodiments, the micro-display pixel unit further includes a reflective layer 270 . When the top surface of the bottommost light-emitting mesa 210 (i.e., the first light-emitting mesa 211 ) is larger than the bottom surface, the reflective layer 270 is disposed on the bottom surface and sidewalls of the first light-emitting mesa 211 . The reflective layer 270 can reflect downward light emitted by the first light-emitting mesa 211 away from the driving backplane 120 , thereby improving light extraction efficiency.

[0098] 2 to 4 , in some embodiments, the micro-display pixel unit further includes a conductive pillar 280 , one end of which is electrically connected to the driving backplane 120 , and the other end of which is electrically connected to the bottom conductive layer 222 (i.e., the first bottom conductive layer 222 a ) located below the bottom-most light-emitting mesa 210 (i.e., the first light-emitting mesa 211 ).

[0099] Please refer to FIG. 7 and FIG. 8 , which show a micro display array composed of a plurality of micro display pixel units shown in FIG. 1 .

[0100] Figure 9 is a schematic diagram of the three-dimensional structure of a micro-display pixel unit according to another embodiment of the present invention; Figure 10 is a schematic diagram of the top-down structure of Figure 9; Figure 11 is a schematic diagram of the cross-sectional structure along line a'-a' in Figure 10; Figure 12 is a schematic diagram of the cross-sectional structure along line b'-b' in Figure 10; Figure 13 is a schematic diagram of the cross-sectional structure along line c'-c' in Figure 10; Figure 14 is a schematic diagram of the cross-sectional structure along line d'-d' in Figure 10; Figure 15 is a schematic diagram of the three-dimensional structure of a modified embodiment of the micro-display pixel unit of the embodiment shown in Figure 9; Figure 16 is a schematic diagram of the structure of a micro-display array composed of a plurality of micro-display pixel units according to the embodiment shown in Figure 9; and Figure 17 is a schematic diagram of the cross-sectional structure along line aa in Figure 16.

[0101] This embodiment specifically describes the micro-display pixel unit using three light-emitting mesas.

[0102] Referring to Figure 9 , the micro-display pixel unit includes three light-emitting mesas spaced apart in a vertically staggered pattern. For example, a first light-emitting mesa 110a is located at the bottom, a second light-emitting mesa 120a is located above the first light-emitting mesa 110a, and a third light-emitting mesa 130a is located above the second light-emitting mesa 120a. The top surface of the first light-emitting mesa 110a is lower than the bottom surface of the second light-emitting mesa 120a, and the top surface of the second light-emitting mesa 120a is lower than the bottom surface of the third light-emitting mesa 130a. In other words, the first light-emitting mesa 110a, the second light-emitting mesa 120a, and the third light-emitting mesa 130a are spaced apart, i.e., do not touch each other.

[0103] Continuing with FIG9 , in some embodiments, at least a portion of the first light-emitting mesa 110a, the second light-emitting mesa 120a, and the third light-emitting mesa 130a may overlap. For example, at least a portion of the second light-emitting mesa 120a may overlap with at least a portion of the first light-emitting mesa 110a without contacting it, or at least a portion of the third light-emitting mesa 130a may overlap with at least a portion of the first light-emitting mesa 110a or the second light-emitting mesa without contacting it. Simultaneously, another portion of the second light-emitting mesa 120a may not overlap with the first light-emitting mesa 110a, or another portion of the third light-emitting mesa 130a may not overlap with the second light-emitting mesa 120a or the first light-emitting mesa 110a. Specifically, a portion of the third light-emitting mesa 130a may overlap with a portion of the second light-emitting mesa 120a, and a portion of the second light-emitting mesa 120a may overlap with a portion of the first light-emitting mesa 110a. Another portion of the first light-emitting mesa 110 a is not covered by the second light-emitting mesa 120 a or the third light-emitting mesa 130 a , and another portion of the second light-emitting mesa 120 a is not covered by the third light-emitting mesa 130 a .

[0104] In some embodiments, the first light-emitting mesa 110a, the second light-emitting mesa 120a, and the third light-emitting mesa 130a each include an upper electrode and a lower electrode (not shown). For example, the upper electrode is disposed on the upper surface of the light-emitting mesa, and the lower electrode is disposed on the lower surface of the light-emitting mesa.

[0105] 9 , in some embodiments, the micro display pixel unit further includes: a group of conductive base pads; wherein the group of conductive base pads includes: a first base pad 111a of the first light-emitting mesa 110a located below the first light-emitting mesa 110a, a second base pad 121a of the second light-emitting mesa 120a located below a portion of the second light-emitting mesa 120a not covering the first light-emitting mesa 110a, and a third base pad 131a located below the third light-emitting mesa 130a not covering the second light-emitting mesa 120a.

[0106] In some embodiments, the micro-display pixel unit further includes a driving backplane (not shown in FIG. 9 ), and a first bottom pad 111a, a second bottom pad 121a, and a third bottom pad 131a are provided on the driving backplane. Therefore, each light-emitting mesa (i.e., the first light-emitting mesa 110a, the second light-emitting mesa 120a, and the third light-emitting mesa 130a) can be connected to the bottom pad below its own bottom surface. For the micro-display pixel unit, all the bottom pads (i.e., the first bottom pad 111a, the second bottom pad 121a, and the third bottom pad 131a) can be disposed below the light-emitting area formed by the first light-emitting mesa 110a, the second light-emitting mesa 120a, and the third light-emitting mesa 130a). Therefore, the outer area of ​​the bottom pad is not required, and because the three light-emitting mesas at least partially overlap, the cross-sectional size of the micro-display pixel unit is reduced.

[0107] 9 , in some embodiments, the first light-emitting mesa 110 a and the second light-emitting mesa 120 a have a conical structure, i.e., the area of ​​the top surface is smaller than the area of ​​the bottom surface of the light-emitting mesa, and the third light-emitting mesa 130 a has an inverted conical structure, i.e., the area of ​​the top surface is larger than the area of ​​the bottom surface of the light-emitting mesa.

[0108] Referring to FIG. 15 , in some embodiments, the first light-emitting mesa 110 a , the second light-emitting mesa 120 a , and the third light-emitting mesa 130 a are all inverted tapered structures.

[0109] In some embodiments, the first light-emitting mesa 110 a and the third light-emitting mesa 130 a are tapered structures, and the second light-emitting mesa 120 a is an inverted tapered structure.

[0110] In some embodiments, the second light-emitting mesa 120 a and the third light-emitting mesa 130 a are tapered structures, and the first light-emitting mesa 110 a is an inverted tapered structure.

[0111] In some embodiments, the first light-emitting mesa 110 a and the second light-emitting mesa 120 a are inverted tapered structures, and the third light-emitting mesa 130 a is a tapered structure.

[0112] In some embodiments, the second light-emitting mesa 120 a and the third light-emitting mesa 130 a are inverted tapered structures, and the first light-emitting mesa 110 a is a tapered structure.

[0113] In some embodiments, the first light-emitting mesa 110 a and the third light-emitting mesa 130 a are inverted tapered structures, and the second light-emitting mesa 120 a is a tapered structure.

[0114] Please continue to refer to Figures 9 and 15. In some embodiments, each light-emitting mesa (i.e., the first light-emitting mesa 110a, the second light-emitting mesa 120a, and the third light-emitting mesa 130a) has a symmetrical structure. The symmetrical structure includes: a first vertical symmetry plane along the length direction; a second vertical symmetry plane along the width direction; and a vertical center line formed by the intersection of the first vertical symmetry plane and the second vertical symmetry plane. The vertical center line of the first light-emitting mesa 110a and the vertical center line of the second light-emitting mesa 120a are not aligned with each other; the vertical center line of the first light-emitting mesa 110a and the vertical center line of the third light-emitting mesa 130a are not aligned with each other; the vertical center line of the second light-emitting mesa 120a and the vertical center line of the third light-emitting mesa 130a are not aligned with each other. That is, the three light-emitting mesa are not coaxially arranged.

[0115] In some embodiments, the top and bottom surfaces of the three light-emitting mesas are rectangular or circular with a width (shorter side) and a length (longer side).

[0116] Referring to Figures 11 to 14 , the micro-display pixel unit further includes a top conductive layer 160a formed on the top surface of the micro-display pixel unit. Top conductive layer 160a is continuously formed on the first light-emitting mesa 110a, the second light-emitting mesa 120a, and the third light-emitting mesa 130a, and is configured to connect to the upper electrodes of the first light-emitting mesa 110a, the second light-emitting mesa 120a, and the third light-emitting mesa 130a. Top conductive layer 160a has an undulating structure and includes one or more recessed portions.

[0117] Continuing with reference to FIG11 and FIG14 , in some embodiments, the top conductive layer 160a includes a recessed portion (e.g., a first recessed portion 161a, a second recessed portion 162a, and a third recessed portion 163a) corresponding to each light-emitting mesa (i.e., the first light-emitting mesa 110a, the second light-emitting mesa 120a, and the third light-emitting mesa 130a), respectively configured to connect to each light-emitting mesa. Because the first light-emitting mesa 110a, the second light-emitting mesa 120a, and the third light-emitting mesa 130a are located at different vertical positions, the first recessed portion 161a, the second recessed portion 162a, and the third recessed portion 163a have different depths.

[0118] Continuing with reference to Figures 11 and 14 , in some embodiments, the micro-display pixel unit further includes top electrical connection structures (e.g., a first top electrical connection structure 113a, a second top electrical connection structure 123a, and a third top electrical connection structure 133a) for connecting the top electrodes of the three light-emitting mesas to the top conductive layer 160a. For example, a first top electrical connection structure 113a is provided on the top surface of the first light-emitting mesa 110a for connecting to the top conductive layer 160a. A second top electrical connection structure 123a is provided on the top surface of the second light-emitting mesa 120a for connecting to the top conductive layer 160a. The top electrical connection structures can function as ohmic contact layers.

[0119] In some embodiments, the material of the top electrical connection structure is metal.

[0120] In some embodiments, the top conductive layer 160 a may directly contact the first light-emitting mesa 110 a , the second light-emitting mesa 120 a , and the third light-emitting mesa 130 a , thereby eliminating the need for a top electrical connection structure.

[0121] In some embodiments, the top conductive layer 160a is made of a transparent material with a light transmittance of not less than 70a%.

[0122] In some embodiments, the top conductive layer 160a is a TCO (transparent conductive oxide) layer, such as an ITO (indium tin oxide) layer, an AZO (antimony-doped zinc oxide) layer, an ATO (antimony-doped tin oxide) layer, or a FTO (fluorine-doped tin oxide) layer.

[0123] Continuing with reference to FIG. 10 , in some embodiments, the micro display pixel unit further includes a top contact structure 180 a , which is disposed on the top conductive layer 160 a and configured to provide contact for the top conductive layer 160 a .

[0124] In some embodiments, the top contact structure 180a is connected to a top pad (not shown) and further connected to an external circuit. The top pad is disposed on a driving backplane, and the top contact structure 180a is located at the edge of the micro display pixel unit and around the periphery of the micro display pixel unit.

[0125] Continuing with reference to FIG. 11 , in some embodiments, the micro display pixel unit further includes an optical isolation structure 140 a provided around the micro display pixel unit, which is configured to prevent light from crossing between adjacent micro display pixel units.

[0126] Continuing with Figure 11 , in some embodiments, the top of the optical isolation structure 140a is equal to or higher than the top surface of the third light-emitting mesa 130a, and the bottom of the optical isolation structure 140a is equal to or lower than the bottom surface of the first light-emitting layer 110a. Therefore, the optical isolation structure 140a can prevent light from crossing between the light-emitting mesas of adjacent micro-display pixel units. It will be appreciated that the optical isolation structure 140a is not connected to the light-emitting mesas (i.e., the first light-emitting mesa 110a, the second light-emitting mesa 120a, and the third light-emitting mesa 130a), the top conductive layer 160a, or the IC backplane.

[0127] In some embodiments, the optical isolation structure 140a is reflective.

[0128] In some embodiments, the material of the optical isolation structure 140a is metal.

[0129] In some embodiments, the micro display pixel unit further includes a dielectric material (not shown) filled in the micro display pixel unit, that is, the dielectric material fills at least part of the space defined by the driving backplane, the top conductive layer 160a and the optical isolation structure 140a.

[0130] In some embodiments, the dielectric material is selected from one or more of silicon oxide, silicon nitride, SiCN, SiNO, or Al2O3, or is a transparent material.

[0131] Please refer to FIG. 16 and FIG. 17 , which show a micro display array composed of a plurality of micro display pixel units as shown in FIG. 9 .

[0132] Figure 18 is a schematic top view of the structure of a micro-display pixel unit according to another embodiment of the present invention; Figure 19 is a schematic cross-sectional structure diagram along line a"-a" in Figure 18; Figure 20 is a schematic cross-sectional structure diagram along line b"-b" in Figure 18; Figure 21 is a schematic structural diagram of a modified implementation of the micro-display pixel unit according to the embodiment shown in Figure 18; Figure 22 is a schematic structural diagram of a micro-display array composed of a plurality of micro-display pixel units according to the embodiment shown in Figure 18; and Figure 23 is a schematic cross-sectional structure diagram along line aa in Figure 22.

[0133] This embodiment specifically describes the micro-display pixel unit using three light-emitting mesas.

[0134] 18 to 21 , the micro display pixel unit includes a driving backplane 10a, a first light emitting mesa 110b, a second light emitting mesa 120b, and a third light emitting mesa 130b spaced from bottom to top on the driving backplane 10b.

[0135] In some embodiments, the first light-emitting mesa 110 b emits red light, the second light-emitting mesa 120 b emits green light, and the third light-emitting mesa 130 b emits blue light.

[0136] 19 to 21 , in some embodiments, the micro display pixel unit further includes: a top conductive layer 31 b (i.e., a first top conductive layer 311 b, a second top conductive layer 312 b, and a third top conductive layer 313 b) disposed above each light-emitting mesa (i.e., the first light-emitting mesa 110 b, the second light-emitting mesa 120 b, and the third light-emitting mesa 130 b) and a bottom conductive layer 32 b (a first bottom conductive layer 321 b, a second bottom conductive layer 322 b, and a third bottom conductive layer 323 b) located below each light-emitting mesa.

[0137] Continuing with reference to Figures 19 to 21, in some embodiments, the micro-display pixel unit further includes: a first conductive pillar 41b, a second conductive pillar 42b, and a third conductive pillar 43b. The bottom end of the first conductive pillar 41b is electrically connected to the driving backplane 10b, and the top end of the first conductive pillar 41b is electrically connected to the first bottom conductive layer 321b below the first light-emitting mesa 110b. The bottom end of the second conductive pillar 42b is electrically connected to the driving backplane 10b, and the top end of the second conductive pillar 42b is electrically connected to the second bottom conductive layer 322b below the second light-emitting mesa 120b. The bottom end of the third conductive pillar 43b is electrically connected to the driving backplane 10b, and the top end of the third conductive pillar 43b is electrically connected to the third bottom conductive layer 323b below the third light-emitting mesa 130b.

[0138] 19 and 21 , in some embodiments, the micro display pixel unit further includes: a top conductive pillar 44 b , a first top conductive layer 311 b located above the first light-emitting mesa 110 b , and a second top conductive layer 312 b located above the second light-emitting mesa 120 b , respectively electrically connected to the top conductive pillar 44 b .

[0139] Continuing with reference to Figures 19 to 21 , in some embodiments, the micro-display pixel unit further includes a top series connection layer 45b electrically connected to the third top conductive layer 313b located above the third light-emitting mesa 130b, and the top series connection layer 45b electrically connected to the top conductive pillar 44b. The top series connection layers 45b between adjacent micro-display pixel units are electrically connected to each other.

[0140] Continuing with Figures 19 and 20 , in some embodiments, the micro-display pixel unit further includes a pixel isolation structure 50b disposed around at least two light-emitting mesas. The pixel isolation structure 50b prevents light crosstalk between adjacent light-emitting mesas. The side of the pixel isolation structure 50b facing the light-emitting mesas is an inclined surface. When light emitted from the at least two light-emitting mesas strikes the inclined surface of the pixel isolation structure 50b, the pixel isolation structure 50b is configured to reflect the light away from the driver backplane 10b, thereby improving light extraction efficiency.

[0141] In some embodiments, the micro-display pixel unit further includes: a bottom connecting mesa (not shown) located between the bottom-most light-emitting mesa (i.e., the first light-emitting mesa 110b) and the driving backplane 10b, and the bottom connecting mesa is electrically connected to the driving backplane 10b and the first light-emitting mesa 110b, respectively.

[0142] In some embodiments, the material of the bottom connection mesa includes a metal material; the metal material includes one or more of Al, Au, Rh, Ag, Cr, Ti, Pt, Sn, Cu, AuSn and TiW.

[0143] 20 , in some embodiments, the top surface area of ​​the bottommost light-emitting mesa (i.e., the first light-emitting mesa 110 b ) is larger than the bottom surface area, and the top surface areas of the remaining light-emitting mesas (i.e., the second light-emitting mesa 120 b and the third light-emitting mesa 130 b ) are smaller than the bottom surface areas.

[0144] 21 , in some embodiments, the top surface areas of all light-emitting mesas (ie, the first light-emitting mesa 110 b , the second light-emitting mesa 120 b , and the third light-emitting mesa 130 b ) are larger than the bottom surface areas.

[0145] In some embodiments, the top surface area of ​​the second light-emitting mesa 120b is larger than the bottom surface area, and the top surfaces of the remaining light-emitting mesas (ie, the first light-emitting mesa 110b and the third light-emitting mesa 130b) are smaller than the bottom surface area.

[0146] In some embodiments, the top surface area of ​​the third light-emitting mesa 130b is larger than the bottom surface area, and the top surfaces of the remaining light-emitting mesas (ie, the second light-emitting mesa 120b and the first light-emitting mesa 110b) are smaller than the bottom surface area.

[0147] In some embodiments, the top surface areas of the first and second light-emitting mesas 110 b and 120 b are larger than the bottom surface areas, and the top surface area of ​​the third light-emitting mesa 130 b is smaller than the bottom surface area.

[0148] In some embodiments, the top surface areas of the first and third light-emitting mesas 110 b and 130 b are larger than the bottom surface areas, and the top surface area of ​​the second light-emitting mesa 120 b is smaller than the bottom surface area.

[0149] In some embodiments, the top surface areas of the second and third light-emitting mesas 120 b and 130 b are larger than the bottom surface areas, and the top surface area of ​​the first light-emitting mesa 110 b is smaller than the bottom surface area.

[0150] Please refer to FIG. 22 and FIG. 23 , which show a micro display array composed of a plurality of micro display pixel units as shown in FIG. 18 .

[0151] Correspondingly, an embodiment of the present invention further provides a micro display panel, comprising: a micro display array composed of a plurality of micro display pixel units as described in any one of the above embodiments.

[0152] In some embodiments, the length of the micro display panel ranges from 500 μm to 50,000 μm; and the resolution of the micro display array in the micro display panel is one of 320*240, 640*480, 1920*1080, and 2560*1440.

[0153] Correspondingly, the technical solution of the present invention further provides an electronic device, comprising: at least one micro display panel as described in any one of the above embodiments.

[0154] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A micro display pixel unit, characterized in that: include: Driver backplane; a light-emitting structure located on one side of the driving backplane, the light-emitting structure comprising at least two light-emitting mesas, the at least two light-emitting mesas being spaced apart in a vertical direction and electrically connected to the driving backplane respectively; The light-emitting mesa includes a top surface away from the driving backplane and a bottom surface close to the driving backplane. The area of ​​the top surface of at least one of the at least two light-emitting mesas is larger than the area of ​​the bottom surface, and the outline of the bottom surface of the light-emitting mesa, when vertically projected onto the top surface, is located within the outline range of the top surface.

2. The micro display pixel unit according to claim 1, wherein: The area of ​​the top surface of the uppermost light-emitting mesa among the at least two light-emitting mesas is larger than the area of ​​the bottom surface, and the contour of the bottom surface of the uppermost light-emitting mesa, when vertically projected onto the top surface, is within the contour range of the top surface.

3. The micro display pixel unit according to claim 1, wherein: The area of ​​the top surface of the light-emitting mesa adjacent to the uppermost light-emitting mesa among the at least two light-emitting mesas is larger than the area of ​​the bottom surface, and the contour of the bottom surface of the light-emitting mesa adjacent to the uppermost light-emitting mesa, when vertically projected onto the top surface, is located within the contour range of the top surface.

4. The micro display pixel unit according to claim 1, wherein: Among the at least two light-emitting mesas, except for the light-emitting mesa at the bottom layer, whose top surface area is smaller than the bottom surface area, the top surfaces of the remaining light-emitting mesas are all larger than the bottom surfaces, and the contours of the bottom surfaces of the remaining light-emitting mesas, when vertically projected onto the top surface, are all within the contour range of the top surface.

5. The micro display pixel unit according to claim 1, wherein: The top surface area of ​​the bottom light-emitting mesa among the at least two light-emitting mesas is larger than the bottom surface area, and the contour of the bottom surface of the bottom light-emitting mesa is vertically projected onto the top surface and is within the contour range of the top surface.

6. The micro display pixel unit according to claim 5, characterized in that: A reflective layer is formed on the bottom surface and sidewalls of the light-emitting mesa at the bottom layer.

7. The micro display pixel unit according to any one of claims 1 to 5, characterized in that: Also includes: an electrical connection structure, the electrical connection structure being disposed on the periphery of the light-emitting mesa; The electrical connection structure includes at least one top electrical connection structure and at least one bottom electrical connection structure. The at least one top electrical connection structure is electrically connected to the top of the light-emitting mesa, and each bottom electrical connection structure is electrically connected to the bottom of one light-emitting mesa.

8. The micro display pixel unit according to any one of claims 1 to 5, characterized in that: The top surface and the bottom surface of the at least two light-emitting mesas are both circular in shape, and the at least two light-emitting mesas are coaxially arranged in a vertical direction.

9. The micro display pixel unit according to claim 8, characterized in that: Also includes: An electrical connection structure is arranged on the periphery of the light-emitting mesa; the electrical connection structure includes at least one top electrical connection structure and at least one bottom electrical connection structure, the at least one top electrical connection structure is electrically connected to the top of the light-emitting mesa, and each of the bottom electrical connection structures is electrically connected to the bottom of one of the light-emitting mesas.

10. The micro display pixel unit according to claim 9, characterized in that: It also includes: conductive layers located on the upper and lower sides of the light-emitting mesa, the conductive layers including a top conductive layer arranged above the light-emitting mesa, and a bottom conductive layer arranged below the light-emitting mesa; the at least one top electrical connection structure is electrically connected to the top conductive layer, and each of the bottom electrical connection structures is electrically connected to one of the bottom conductive layers.

11. The micro display pixel unit according to claim 10, characterized in that: An insulating medium is filled between adjacent light-emitting mesas.

12. The micro display pixel unit according to any one of claims 1 to 5, characterized in that: Also includes: A pixel isolation structure, wherein the pixel isolation structure surrounds the at least two light-emitting tables, and the inner wall of the pixel isolation structure is an inclined slope. When part of the light emitted by the at least two light-emitting tables hits the pixel isolation structure, the pixel isolation structure is used to reflect the light in a direction away from the driving backplane.

13. The micro display pixel unit according to any one of claims 1 to 5, characterized in that: The at least two light-emitting mesas include: a first light-emitting mesas, a second light-emitting mesas, and a third light-emitting mesas; wherein the second light-emitting mesas is arranged above the first light-emitting mesas, and a portion of the first light-emitting mesas is covered by the second light-emitting mesas; the third light-emitting mesas is arranged above the second light-emitting mesas, and a portion of the second light-emitting mesas is covered by the third light-emitting mesas.

14. The micro display pixel unit according to claim 13, characterized in that: The top surface of the first light-emitting mesa, the top surface of the second light-emitting mesa, and the third light-emitting mesa are in a conical structure or an inverted conical structure.

15. The micro display pixel unit according to claim 13, wherein: The first light-emitting mesa, the second light-emitting mesa, and the third light-emitting mesa all have a symmetrical structure; the symmetrical structure includes: a first vertical symmetry plane along the length direction; a second vertical symmetry plane along the width direction; and a vertical center line formed by the intersection of the first vertical symmetry plane and the second vertical symmetry plane.

16. The micro display pixel unit according to claim 15, characterized in that: The vertical center line of the first light-emitting mesa and the vertical center line of the second light-emitting mesa are not aligned with each other; the vertical center line of the first light-emitting mesa and the vertical center line of the third light-emitting mesa are not aligned with each other; the vertical center line of the second light-emitting mesa and the vertical center line of the third light-emitting mesa are not aligned with each other.

17. The micro display pixel unit according to claim 14, wherein: The first light-emitting mesa is not covered by any portion of the third light-emitting mesa.

18. The micro display pixel unit according to any one of claims 1 to 5, characterized in that: Also includes: The bottom connecting mesa is located between the light emitting mesa at the bottom layer and the driving back plate, and the bottom connecting mesa is electrically connected to the driving back plate and the light emitting mesa at the bottom layer respectively.

19. The micro display pixel unit according to claim 18, wherein: The material of the bottom connection mesa includes a metal material; the metal material includes one or more of Al, Au, Rh, Ag, Cr, Ti, Pt, Sn, Cu, AuSn and TiW.

20. The micro display pixel unit according to claim 18, wherein: It also includes: conductive layers located on the upper and lower sides of the light-emitting mesa, the conductive layers including a top conductive layer arranged above the light-emitting mesa, and a bottom conductive layer arranged below the light-emitting mesa; the at least one top electrical connection structure is electrically connected to the top conductive layer, and each of the bottom electrical connection structures is electrically connected to one of the bottom conductive layers.

21. The micro display pixel unit according to claim 20, characterized in that: The material of the conductive layer includes a transparent material; the transparent material includes: ITO, FTO, AZO or a combination of one or more thereof.

22. The micro display pixel unit according to claim 1, wherein: Also includes: A micro lens is arranged above the topmost light-emitting mesa.

23. The micro display pixel unit according to claim 22, characterized in that: A bottom area of ​​the microlens is larger than a larger one of a top surface and a bottom surface of the light-emitting mesa.

24. The micro display pixel unit according to claim 23, characterized in that: The thickness of the microlens is less than or equal to 10 μm.

25. The micro display pixel unit according to claim 1, wherein: The thickness of the light-emitting mesa ranges from 0.3 μm to 3.5 μm; the bottom diameter of the light-emitting mesa ranges from 0.5 μm to 50 μm.

26. A micro display panel, characterized in that: include: A micro display array composed of a plurality of micro display pixel units according to any one of claims 1 to 25.

27. The micro display panel according to claim 26, wherein: The length of the micro display panel ranges from 500 μm to 50,000 μm; the resolution of the micro display array in the micro display panel is one of 320*240, 640*480, 1920*1080 and 2560*1440.

28. An electronic device, characterized in that: include: At least one micro display panel according to claim 26 or 27.

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