Micro display panels, display modules and their forming methods, electronic devices

Abstract

A micro-display panel, a display module, a method for forming the same, and an electronic device are disclosed. The display module includes: a light-combining prism structure comprising a first light-incident surface, a second light-incident surface, and a light-exiting surface, the first light-incident surface and the light-exiting surface being opposite each other; a first display panel for emitting a first light ray, the first light ray being able to enter the light-combining prism structure through the first light-incident surface and exit through the light-exiting surface; and a second display panel for emitting a second light ray, the second light ray being able to enter the light-combining prism structure through the second light-incident surface and exit through the light-exiting surface; at least one of the first display panel and the second display panel is capable of emitting at least two different colors of light. The display module, composed of the light-combining prism structure, the first display panel, and the second display panel, simplifies the manufacturing process of the display module and reduces manufacturing costs.

Description

Technical Field

[0001] This invention relates to the field of microdisplays, and more particularly to a microdisplay panel, a display module, a method for forming the same, and an electronic device. Background Technology

[0002] Inorganic micropixel light-emitting diodes, also known as micro LEDs or μ-LEDs, have become increasingly important since their application in various fields, including self-emissive microdisplays, visible light communication, and optogenetics. Compared to traditional LEDs, Micro LEDs offer advantages such as better strain relaxation, higher light extraction efficiency, more uniform current diffusion, and higher output performance. Micro LEDs also boast improved thermal effects, faster response times, a wider operating temperature range, higher resolution, a broader color gamut, higher contrast, lower power consumption, and higher current density, making them widely used in near-eye display applications.

[0003] Improving the performance and manufacturing process of inorganic micropixel light-emitting diodes is an ongoing challenge. Summary of the Invention

[0004] The technical problem solved by this invention is to provide a micro-display panel, a display module and its forming method, and an electronic device to improve the performance and manufacturing process of inorganic micro-pixel light-emitting diodes.

[0005] To address the aforementioned technical problems, the present invention provides a micro-display panel, comprising: a driving backplate; a pixel array disposed on the surface of the driving backplate, the pixel array including a plurality of light-emitting units, each light-emitting unit including at least two light-emitting mesa layers, the at least two light-emitting mesa layers being stacked vertically on the surface of the driving backplate; at least two electrodes, the at least two electrodes being electrically connected to the at least two light-emitting mesa layers respectively, the at least two electrodes being electrically connected to the driving backplate respectively, and the electrode corresponding to the upper light-emitting mesa layer corresponding to the lower light-emitting mesa layer being electrically connected to the driving backplate.

[0006] Accordingly, the present invention also provides a display module, comprising: a light-combining prism structure, the light-combining prism structure including a first light-incident surface, a second light-incident surface, and a light-outceasing surface, the first light-incident surface and the light-outceasing surface being opposite to each other; a first display panel, the first display panel being used to emit a first light ray, the first light ray being able to enter the light-combining prism structure through the first light-incident surface and exit through the light-outceasing surface; wherein, at least one of the first display panel and the second display panel is the aforementioned micro-display panel, the micro-display panel being able to emit at least two different colors of light.

[0007] Accordingly, the present invention also provides an electronic device, including the above-mentioned display module.

[0008] Accordingly, the present invention also provides a method for forming a display module, comprising: providing a light-combining prism structure, the light-combining prism structure including a first light-incident surface, a second light-incident surface, and a light-outceasing surface, the first light-incident surface and the light-outceasing surface being opposite to each other; providing a first display panel and fixing the first display panel relative to the first light-incident surface, wherein the first display panel is used to emit a first light ray, the first light ray being able to enter the light-combining prism structure through the first light-incident surface and exit through the light-outceasing surface; providing a second display panel and fixing the second display panel relative to the second light-incident surface, wherein the second display panel is used to emit a second light ray, the second light ray being able to enter the light-combining prism structure through the second light-incident surface and exit through the light-outceasing surface. Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0009] The micro-display panel of the present invention includes a light-emitting unit comprising at least two stacked light-emitting platforms. The electrode corresponding to the upper light-emitting platform is electrically connected to the driving backplate through the lower light-emitting platform. The electrode does not occupy additional area on the driving backplate, thus saving the area of ​​the micro-display panel and further realizing the miniaturization of the display panel.

[0010] The present invention discloses a display module and a method for forming a display module, wherein a first light source is emitted by a first display panel, a second light source is emitted by a second display panel, and at least one of the first and second display panels is capable of emitting light of at least two different colors. The display module comprises a light-combining prism structure, a first display panel, and a second display panel, which simplifies the manufacturing process of the display module and reduces manufacturing costs.

[0011] Furthermore, the light-combining prism structure includes a first prism and a second prism. The light-combining prism structure is formed by fitting the inclined surfaces of the first prism and the second prism together, further simplifying the manufacturing process and reducing manufacturing costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a micro-display module in one embodiment;

[0013] Figure 2 and Figure 3 This is a schematic diagram of the structure of the micro-display panel in an embodiment of the present invention;

[0014] Figures 4 to 6 This is a schematic diagram of the display module structure in an embodiment of the present invention;

[0015] Figure 7 This is a schematic flowchart of the method for forming a display module in an embodiment of the present invention. Detailed Implementation

[0016] As described in the background section, improving the performance and manufacturing process of inorganic micropixel light-emitting diodes is a problem that needs continuous improvement. This will now be analyzed and explained in conjunction with specific embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of a micro-display module in one embodiment.

[0018] Please refer to Figure 1 The micro-display module includes: a light-combining prism 1p, an optical lens 2p, a first micro-display panel 31p, a second micro-display panel 32p, and a third micro-display panel 33p. The first micro-display panel 31p, the second micro-display panel 32p, and the third micro-display panel 33p can emit three different colors of light, for example, the first micro-display panel 31p emits red light, the second micro-display panel 32p emits blue light, and the third micro-display panel 33p emits green light. The first micro-display panel 31p, the second micro-display panel 32p, and the third micro-display panel 33p are respectively arranged to correspond to the three light-incident surfaces of the light-combining prism 1p. The light combining prism 1p contains a first optical film 14p and a second optical film 12p. Light emitted from the first microdisplay panel 31p can pass through the first optical film 14p and the second optical film 12p and exit through the light-emitting surface of the light combining prism 1p. Light emitted from the second microdisplay panel 32p is reflected by the first optical film 14p and then propagates to the light-emitting surface of the light combining prism 1p before exiting. Light emitted from the third microdisplay panel 33p is reflected by the second optical film 12p and then propagates to the light-emitting surface of the light combining prism 1p before exiting. The optical lens 2p is arranged corresponding to the light-emitting surface of the light combining prism 1p.

[0019] In the aforementioned micro-display module, the light-combining prism 1p needs to be assembled from four prisms with triangular cross-sections. Two types of optical films need to be placed at the points where the four prisms fit together to reflect or transmit light emitted from the first display panel 31p, the second display panel 32p, and the third display panel 33p. This process is complex and costly. Furthermore, fixing the first micro-display panel 31p, the second micro-display panel 32p, and the third micro-display panel 33p to the three light-incident surfaces of the light-combining prism 1p requires three alignment operations, further complicating the manufacturing process and increasing costs.

[0020] To address the aforementioned problems, the present invention provides a micro-display panel, a display module, a method for forming the same, and an electronic device. The first display panel emits a first light beam, and the second display panel emits a second light beam. At least one of the first and second display panels can emit light of at least two different colors. The display module comprises a light-combining prism structure, a first display panel, and a second display panel, which simplifies the manufacturing process and reduces manufacturing costs.

[0021] To make the above-mentioned objectives, features and beneficial effects of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Figure 2 and Figure 3 This is a schematic diagram of the structure of the micro-display panel in an embodiment of the present invention.

[0023] Please refer to Figure 2 and Figure 3 , Figure 3 for Figure 2 A cross-sectional view along section line AA1 shows that the micro-display panel 40 includes:

[0024] Drive backplane 411;

[0025] A pixel array is disposed on the surface of the driving backplate 411. The pixel array includes a plurality of light-emitting units. Each light-emitting unit includes at least two light-emitting platforms. The at least two light-emitting platforms are stacked on the surface of the driving backplate 411 in a vertical direction.

[0026] At least two electrodes are provided, each electrically connected to one of the at least two light-emitting mesa layers, and each of the at least two electrode layers is electrically connected to the driving backplate 411.

[0027] The electrode corresponding to the upper light-emitting platform passes through the lower light-emitting platform and is electrically connected to the driving backplate 411.

[0028] The microdisplay panel includes a light-emitting unit comprising at least two stacked light-emitting platforms. The electrode corresponding to the upper light-emitting platform is electrically connected to the driving backplate through the lower light-emitting platform. The electrode does not occupy additional area on the driving backplate, thus saving the area of ​​the microdisplay panel and further miniaturizing the display panel.

[0029] Please continue to refer to this. Figure 2 The microdisplay panel 40 includes: a display area 41, a connecting electrode 42 surrounding the display area 41, and an encapsulation frame 43 surrounding the connecting electrode 42. The driving backplate 411 is located in the display area 41, and the connecting electrode 42 is located between the display area 41 and the encapsulation frame 43.

[0030] In this embodiment, the micro display panel 40 further includes a circuit board 44 and a connector 45. One end of the circuit board 44 is electrically connected to the display area 41, and the other end of the circuit board 44 is electrically connected to the connector 45. The connector 45 is adapted to be electrically connected to an external device.

[0031] The encapsulation frame 43 is arranged around the outside of the connecting electrode 42, which can protect the display area 41 and improve the stability of the electrical connection between the display area 41 and the circuit board 44. Preferably, the circuit board 44 includes a flexible circuit board. The connector 45 has an interface type including a MIPI (Mobile Industry Processor Interface).

[0032] Please continue to refer to this. Figure 3 In this embodiment, the light-emitting unit includes two light-emitting platforms. The light-emitting unit includes a first light-emitting platform 412a and a second light-emitting platform 412b located on the first light-emitting platform 412a. The first light-emitting platform 412a and the second light-emitting platform 412b are electrically isolated from each other.

[0033] The first light-emitting mesa 412a includes: a first semiconductor layer, a second semiconductor layer, and a first light-emitting quantum well layer located between the first semiconductor layer and the second semiconductor layer, wherein the first semiconductor layer and the second semiconductor layer have different conductivity types.

[0034] The second light-emitting mesa 412b includes: a third semiconductor layer, a fourth semiconductor layer, and a second light-emitting quantum well layer located between the third semiconductor layer and the fourth semiconductor layer, wherein the third semiconductor layer and the fourth semiconductor layer have different conductivity types.

[0035] The first light-emitting platform 412a and the second light-emitting platform 412b emit monochromatic light respectively, so that the micro-display panel can emit dual-color light, wherein the monochromatic light is one of the three colors: red, green and blue.

[0036] When the first light-emitting platform 412a emits red light, the second light-emitting platform 412b emits blue or green light. The projected area of ​​the first light-emitting platform 412a on the driving backplate 411 is larger than the projected area of ​​the second light-emitting platform 412b on the driving backplate 411, thereby improving the luminous efficiency.

[0037] In this embodiment, the light-emitting unit is only used to emit dual-color light.

[0038] In other embodiments, the light-emitting unit is capable of emitting tri-color light, and the light-emitting unit is capable of selectively emitting bi-color light from the tri-color light.

[0039] In other embodiments, the light-emitting unit may also include three, four or more light-emitting platforms.

[0040] Please continue to refer to this. Figure 3 In this embodiment, the microdisplay panel further includes: a first top conductive layer 413a electrically connected to a plurality of first light-emitting platforms 412a, the first top conductive layer 413a being located on the top surface of the plurality of first light-emitting platforms 412a, the first light-emitting platforms 412a located on the same layer sharing the first top conductive layer 413a, and the first top conductive layer 413a being electrically connected to the connecting electrode 42; a first isolation layer 415c located on the top surface of the first top conductive layer 413a, the second light-emitting platform 412b being located on the first isolation layer 415c, the first isolation layer 415c being used to electrically isolate the first light-emitting platform 412a and the second light-emitting platform 412b.

[0041] The material of the first top conductive layer 413a includes one or more combinations of TCO (Transparent Conductive Oxide) film, ITO (Indium Tin Oxide) film, AZO (Antimony Doped Zinc Oxide) film, ATO (Antimony Doped Tin Oxide) film, and FTO (Fluorine Doped Tin Oxide) film. The first top conductive layer 413a is a transparent conductive material to avoid blocking the light emitted by the light-emitting unit.

[0042] Please continue to refer to this. Figure 3In this embodiment, the electrodes include: a first electrode 4111a, which is located within a driving backplate 411 at the bottom of the first light-emitting platform 412a, and one first electrode 4111a is electrically connected to one first light-emitting platform 412a; and a second electrode 4111b, a portion of which is located within a driving backplate 411 at the bottom of the second light-emitting platform 412b. The second electrode 4111b extends from the driving backplate 411 through the first light-emitting platform 412a, the first top conductive layer 413a, and the first isolation layer 415c to contact the bottom of the second light-emitting platform 412b. One second electrode 4111b is electrically connected to one third light-emitting platform 412b, and the second electrode 4111b is electrically isolated from the first light-emitting platform 412a.

[0043] The material of the first electrode 4111a includes a metal, and the metal includes one or more of Al, Au, Rh, Ag, Cr, Ti, Pt, Sn, Cu, AuSn, TiW, etc.

[0044] The microdisplay panel further includes: at least one through hole penetrating the lower light-emitting platform, with the electrode corresponding to the upper light-emitting platform penetrating through the through hole; an insulating layer located on the inner wall surface of the through hole, wherein the electrode and the lower light-emitting platform are electrically isolated through the insulating layer.

[0045] In this embodiment, the microdisplay panel includes: a through hole 46 penetrating the first light-emitting platform 412a, the first top conductive layer 413a, and the first isolation layer 415c; an insulating layer 415d located on the sidewall surface of the through hole 46; the fifth electrode structure 4111b located within the through hole 46; and the insulating layer 415d electrically isolating the second electrode 4111b from the first light-emitting platform 412a and the first top conductive layer 413a.

[0046] Please continue to refer to this. Figure 3 In this embodiment, the microdisplay panel further includes a second top conductive layer 413b electrically connected to a plurality of second light-emitting platforms 412b. The second top conductive layer 413b is located on the top surface of the plurality of second light-emitting platforms 412b and the surface of the first isolation layer 415c. The second light-emitting platforms 412b located in the same layer share the second top conductive layer 413b, and the second top conductive layer 413b is electrically connected to the connecting electrode 42.

[0047] The material of the second top conductive layer 413b includes one or more combinations of TCO (Transparent Conductive Oxide) film, ITO (Indium Tin Oxide) film, AZO (Antimony-doped Zinc Oxide) film, ATO (Antimony-doped Tin Oxide) film, and FTO (Fluorine-doped Tin Oxide) film. The second top conductive layer 413b is a transparent conductive material to avoid blocking the light emitted by the light-emitting unit.

[0048] The microdisplay panel further includes: a current extension structure disposed between adjacent light-emitting platforms in the same layer, the top conductive layer being located on the top surface of the current extension structure, and the current extension structure being electrically connected to the top conductive layer.

[0049] Please continue to refer to this. Figure 3 In this embodiment, the microdisplay panel further includes: a plurality of first current extension structures 414a disposed on one side of the driving backplate 411, one of the first current extension structures 414a being located between two adjacent first light-emitting platforms 412a; a first top conductive layer 413a being located on the top surface of the first current extension structure 414a, and the first top conductive layer 413a being electrically connected to the plurality of first current extension structures 414a; a plurality of second current extension structures 414b, one of the second current extension structures 414b being disposed between adjacent second light-emitting platforms 412b, the second current extension structure 414b being located on the first isolation layer 415c on top of the first current extension structure 414a; the second top conductive layer 413b being located on the top surface of the plurality of second current extension structures 414b, and the second top conductive layer 413b being electrically connected to the plurality of second current extension structures 414b.

[0050] The first current expansion structure 414a can increase the current flow path of the adjacent first light-emitting mesa 412a, thereby achieving the effect of current expansion. The second current expansion structure 414b can increase the current flow path of the adjacent second light-emitting mesa 412b, thereby achieving the effect of current expansion.

[0051] The first current spreading structure 414a is made of a metal, including one or more of aluminum, gold, silver, chromium, titanium, platinum, copper, rhodium, tin, gold-tin, and titanium-tungsten. The second current spreading structure 414b is also made of a metal, including one or more of aluminum, gold, silver, chromium, titanium, platinum, copper, rhodium, tin, gold-tin, and titanium-tungsten.

[0052] Please continue to refer to this. Figure 3In this embodiment, the microdisplay panel further includes: a second isolation layer 415a located on the sidewall surface of the first light-emitting platform 412a, and the first top conductive layer 413a is also located on the top surface of the second isolation layer 415a; and a third isolation layer 415b located on the sidewall surface of the second light-emitting platform 412b, and the second top conductive layer 413b is also located on the top surface of the third isolation layer 415b.

[0053] The second insulating layer 415a can block the first top conductive layer 413a from contacting the side of the first light-emitting platform 412a, especially preventing the first top conductive layer 413a from contacting the side of the bottom portion of the first light-emitting platform 412a, thus preventing a short circuit between the top and bottom of the first light-emitting platform 412a; the third insulating layer 415b can block the second top conductive layer 413b from contacting the side of the second light-emitting platform 412b, especially preventing the second top conductive layer 413b from contacting the side of the bottom portion of the second light-emitting platform 412b, thus preventing a short circuit between the top and bottom of the second light-emitting platform 412b.

[0054] The material of the second isolation layer 415a is transparent, and the material of the second isolation layer 415a includes one or more combinations of silicon oxide, silicon oxynitride, aluminum oxide and silicon nitride; the material of the third isolation layer 415b is transparent, and the material of the third isolation layer 415b includes one or more combinations of silicon oxide, silicon oxynitride, aluminum oxide and silicon nitride.

[0055] In this embodiment, the microdisplay panel 40 further includes a microlens array disposed on top of the pixel array. The microlens array includes multiple microlenses 416, and the multiple microlenses 416 are correspondingly disposed with the multiple light-emitting units. Light emitted from the first light-emitting platform 412a and the second light-emitting platform 412b is emitted after passing through the corresponding microlens 416.

[0056] In this embodiment, the size of the light-emitting platform in the direction parallel to the surface of the driving backplate 411 is between 15 nm and 15 μm.

[0057] In this embodiment, the pixel array has a size between 500 μm and 50000 μm in the direction parallel to the surface of the driving backplate 411.

[0058] In this embodiment, the plurality of light-emitting units in the pixel array are distributed in an m×n array, and the value of the m×n array includes one of 320×240, 640×480, 1600×1200, 1920×1080, and 2560×1440.

[0059] The aforementioned display panel has a very small volume, with length and width dimensions between 500 μm and 50,000 μm. The light-emitting area of ​​the display panel is very small, for example, 1 mm × 1 mm, 2.64 mm × 2.02 mm, or 3 mm × 5 mm. The light-emitting area of ​​the display panel includes multiple micro-LED pixels arranged in an array, with specific pixel arrangements such as 320 × 240, 640 × 480, 1600 × 1200, 1920 × 1080, or 2560 × 1440. The size of a single micro-LED pixel is between 100 nm and 100 micrometers. In some embodiments, the size of a single micro-LED pixel is between 150 nm and 15 micrometers. In some embodiments, the size of a single micro-LED pixel can be less than 10 micrometers.

[0060] The light-emitting area of ​​the aforementioned micro-display panel includes a pixel array composed of multiple micro-LEDs. A driving backplane is disposed on the back of the micro-LED pixel array. The driving backplane is electrically connected to the micro-LEDs in the micro-LED pixel array. The driving backplane can acquire signals such as image data from the outside world and can control the corresponding micro-LEDs to emit light or not emit light. The driving backplane is a TFT (Thin Film Transistor) board or an IC (Integrated Circuit) board. For example, the driving backplane of the aforementioned micro-display panels (221, 231a, 231b, 231c) integrates a frame buffer, a column driving circuit, and a row driving circuit. The frame buffer includes a first pixel storage area, and the micro-LED pixel array includes a second pixel storage area. A complete frame of pixel grayscale data from the outside world can first enter the first pixel storage area of ​​the frame buffer. The column driving circuit can load the pixel grayscale data in the first pixel storage area of ​​the frame buffer into the second pixel storage area of ​​the micro-LED pixel array. The row driving circuit can scan the pixel grayscale data in the second pixel storage area and generate a pulse modulation signal to achieve the purpose of displaying different grayscale levels. When driving multiple micro-LED pixels in a micro-LED pixel array, either a single pixel can be driven independently, or multiple pixel units can be driven independently. The specific driving method should not constitute a limitation of this application.

[0061] Figures 4 to 6 This is a schematic diagram of the display module in an embodiment of the present invention.

[0062] Please refer to Figure 4 The display module includes a light-combining prism structure 10, which includes a first light-incident surface, a second light-incident surface, and a light-outceasing surface 13, with the first light-incident surface and the light-outceasing surface 13 facing each other.

[0063] The first display panel 30 is used to emit a first light, which can enter the light combining prism structure 10 through the first light incident surface and exit through the light emitting surface 13.

[0064] The second display panel 40 is used to emit a second light beam, which can enter the light combining prism structure 10 through the second light incident surface and exit through the light emitting surface 13.

[0065] The display module consists of a light-combining prism structure 10, a first display panel 30, and a second display panel 40, which can simplify the manufacturing process of the display module and reduce manufacturing costs.

[0066] In this embodiment, the second display panel 40 is as follows: Figure 2 and Figure 3 The micro-display panel shown, the second display panel 40, is capable of emitting two different colors of light. Please refer to [reference needed for the structure of the second display panel 40]. Figure 2 and Figure 3 The contents of that document will not be repeated here.

[0067] In this embodiment, the first display panel 30 is used to emit monochromatic light, and the first light and the second light are monochromatic light and bichromatic light, respectively, which together constitute red, green and blue.

[0068] For example, the first ray is red, and the second ray is blue and green; the first ray is blue, and the second ray is red and green; the first ray is green, and the second ray is blue and red.

[0069] In other embodiments, the first display panel is used to emit dual-color light, and the structure of the first display panel is as follows: Figure 2 and Figure 3 As described in the structure, the second display panel is used to emit monochromatic light.

[0070] In this embodiment, the first display panel 30 is fixed to the first light-incident surface; the second display panel 40 is fixed to the second light-incident surface.

[0071] Please continue to refer to this. Figure 4In this embodiment, the light-combining prism structure 10 includes a first prism 15a and a second prism 15b. The first prism 15a includes a first right-angled surface and a first inclined surface, and the second prism 15a includes a second right-angled surface and a second inclined surface. The first inclined surface of the first prism 15a and the second inclined surface of the second prism 15b are in contact with each other. One set of the first right-angled surface and the second right-angled surface are respectively the first light-incident surface and the light-outcident surface 13, and the other set of the first right-angled surface or the second right-angled surface is the second light-incident surface.

[0072] In this embodiment, the first prism 15a and the second prism 15b, which are bonded together, are fixed by a fixing frame 16. The light-combining prism structure 10 is formed by bonding the first prism 15a and the second prism 15b together, which further simplifies the manufacturing process of the light-combining prism structure 10 and reduces manufacturing costs.

[0073] The light-combining prism structure 10 is made of materials including quartz, optical glass (N-BK7), calcium fluoride, zinc selenide, or germanium. The light-combining prism structure 10 is a highly transparent structure so that the first light emitted from the first display panel 30 and the second light emitted from the second display panel 40 can enter the light-combining prism structure 10 and exit.

[0074] In this embodiment, the light-combining prism structure 10 further includes an optical film 14 located between the first inclined surface of the first prism 15a and the second inclined surface of the second prism 15b. The optical film 14 is located on the propagation path of the first light ray and the second light ray. The optical film 14 is used to reflect or transmit the first light ray to the light-emitting surface 13, and the optical film 14 is used to reflect or transmit the second light ray to the light-emitting surface 13.

[0075] The first and second light rays have different wavelengths. The optical film 14 is an optically designed multilayer dielectric film structure. The multilayer dielectric film structure includes two or three dielectric materials with different refractive indices stacked with a certain thickness and number of layers to achieve different effects of reflection or transmission for different wavelengths.

[0076] In this embodiment, the first display panel 30 emits a first light beam that enters the light-combining prism structure 10 through the first light-incident surface. The optical film 14 is used to transmit the first light beam so that it passes through the light-combining prism structure 10 and exits through the light-exiting surface 13. The second display panel 40 emits a second light beam that enters the light-combining prism structure 10 through the second light-incident surface. The optical film 14 is used to reflect the second light beam so that it passes through the light-combining prism structure 10 and exits through the light-exiting surface 13.

[0077] Please continue to refer to this. Figure 4The display module further includes an optical lens 20 fixed to the light-emitting surface 13. The optical lens 20 is used to receive the first light and the second light emitted from the light-emitting surface 13, and to collimate the first light and the second light before emitting them. The center of the optical lens 20 is aligned with the center of the light-combining prism structure 10.

[0078] Please refer to Figure 5 and Figure 6 , Figure 6 for Figure 5 A cross-sectional structural diagram along section line AA1 shows that the first display panel 30 includes: a first display area 31, a first electrode area 32, and a first encapsulation frame 33. The first electrode area 32 surrounds the first display area 31, and the first encapsulation frame 33 surrounds the first electrode area 32. The first electrode area 32 is located between the first display area 31 and the first encapsulation frame 33.

[0079] In this embodiment, the first display panel 30 further includes a first circuit board 34 and a first connector 35. One end of the first circuit board 34 is electrically connected to the first display area 31, and the other end of the first circuit board 34 is electrically connected to the first connector 35. The first connector 35 is adapted to be electrically connected to an external device to control the lighting or extinguishing of the Micro LED in the first display area 31.

[0080] The first encapsulation frame 33 is disposed around the outer side of the first electrode area 32, which can protect the first display area 31 and improve the stability of the electrical connection between the first display area 31 and the first circuit board 34. Preferably, the first circuit board 34 includes a flexible circuit board. The interface type of the first connector 35 includes a MIPI (Mobile Industry Processor Interface) interface.

[0081] The first display panel 30 includes LED, OLED, AMOLED, MiniLED or MicroLED.

[0082] In this embodiment, the first display panel 30 includes MicroLEDs.

[0083] In this embodiment, the first display panel 30 is used only to emit monochromatic light.

[0084] In other embodiments, the first display panel is capable of emitting dual-color light or tri-color light, and the first display panel is capable of selectively emitting monochromatic light from the dual-color light or tri-color light.

[0085] Please continue to refer to this. Figure 6The first display area 31 includes: a first driving back plate 311 and a plurality of third light-emitting platforms 312 disposed on one side of the first driving back plate 311, wherein the third light-emitting platforms 312 are electrically connected to the first driving back plate 311.

[0086] The third light-emitting mesa 312 includes a fifth semiconductor layer, a sixth semiconductor layer, and a third light-emitting quantum well layer located between the fifth semiconductor layer and the sixth semiconductor layer, wherein the fifth semiconductor layer and the sixth semiconductor layer have different conductivity types.

[0087] The fifth semiconductor layer has a conductivity type of N-type or P-type, and the sixth semiconductor layer has a conductivity type of P-type or N-type.

[0088] In this embodiment, the third light-emitting platform 312 is used to emit red light, blue light, or green light.

[0089] In this embodiment, the first display area 31 further includes: a plurality of third electrodes 3111, the third electrodes 3111 being located within a first driving backplate 311 at the bottom of the third light-emitting platform 312, and one of the third electrodes 3111 being electrically connected to one of the third light-emitting platforms 312; and a third top conductive layer 313 being electrically connected to the plurality of third light-emitting platforms 312, the third top conductive layer 313 being located on the top surface of the plurality of third light-emitting platforms 312, and the third top conductive layer 313 being electrically connected to the first electrode area 32.

[0090] The material of the third electrode 3111 includes a metal, which includes one or more of Al, Au, Rh, Ag, Cr, Ti, Pt, Sn, Cu, AuSn, TiW, etc.

[0091] The material of the third top conductive layer 313 includes one or more combinations of TCO (Transparent Conductive Oxide) film, ITO (Indium Tin Oxide) film, AZO (Antimony-doped Zinc Oxide) film, ATO (Antimony-doped Tin Oxide) film, and FTO (Fluorine-doped Tin Oxide) film. The third top conductive layer 313 is a transparent conductive material to avoid blocking the light emitted from the third light-emitting platform 312.

[0092] In this embodiment, the first display area 31 further includes: a plurality of third current extension structures 314 disposed on one side of the first driving back plate 311, wherein one of the third current extension structures 314 is located between two adjacent third light-emitting platforms 312; the third top conductive layer 313 is also located on the top surface of the plurality of third current extension structures 314, and the third top conductive layer 313 is electrically connected to the plurality of third current extension structures 314.

[0093] The third current extension structure 314 can increase the current extension between adjacent third light-emitting platforms 312, reduce the resistance between adjacent third light-emitting platforms 312, and reduce losses.

[0094] The material of the third current extension structure 314 includes metals, including one or more of aluminum, gold, silver, chromium, titanium, platinum, copper, rhodium, tin, gold-tin, and titanium-tungsten.

[0095] In other embodiments, the third current extension structure may not be included.

[0096] In this embodiment, the first display area 31 further includes a third isolation layer 315 located on the side wall surface of the third light-emitting platform 312, and the third top conductive layer 313 is also located on the top surface of the third isolation layer 315.

[0097] The third isolation layer 315 can block the third top conductive layer 313 from contacting the side of the third light-emitting platform 312, and in particular, can prevent the third top conductive layer 313 from contacting the side of the bottom part of the third light-emitting platform 312, thus preventing short circuits at the top and bottom of the third light-emitting platform 312.

[0098] The material of the third isolation layer 315 includes a transparent dielectric material, and the material of the third isolation layer 315 includes one or more combinations of silicon oxide, silicon oxynitride, aluminum oxide and silicon nitride.

[0099] In this embodiment, the first display panel 30 further includes a plurality of first microlenses 316 disposed on the top of the third light-emitting platform 312, wherein one first microlens 316 corresponds to one third light-emitting platform 312. Light emitted from the third light-emitting platform 312 is emitted after passing through the corresponding first microlens 316.

[0100] The material of the first microlens 316 includes glass or resin.

[0101] Accordingly, embodiments of the present invention also provide an electronic device, the electronic device comprising, as follows: Figures 4 to 6 The aforementioned display module.

[0102] The electronic device includes a micro-projector or a near-eye display device. The micro-projector includes a color micro-light engine and a projection panel, with light emitted by the color micro-light engine projected onto a transparent panel. The near-eye display device includes AR (Augmented Reality), VR (Virtual Reality), and MR (Mediated Reality) devices. The near-eye display device includes a wearable device and a color micro-light engine mounted on the wearable device, with light emitted by the color micro-light engine capable of being projected onto the wearable device.

[0103] Figure 7 This is a schematic flowchart of the method for forming a display module in an embodiment of the present invention.

[0104] Please refer to Figure 7 The method for forming the display module includes:

[0105] Step S10: Provide a light-combining prism structure, the light-combining prism structure including a first light-incident surface, a second light-incident surface and a light-outceasing surface, the first light-incident surface and the light-outceasing surface being opposite to each other;

[0106] Step S20: Provide a first display panel and fix the first display panel relative to the first light-incident surface, wherein the first display panel is used to emit a first light ray, the first light ray can enter the light-combining prism structure through the first light-incident surface and exit through the light-emitting surface;

[0107] Step S30: Provide a second display panel and fix the second display panel relative to the second light-incident surface, wherein the second display panel is used to emit a second light, the second light can enter the light-combining prism structure through the second light-incident surface and exit through the light-emitting surface.

[0108] In this embodiment, the method for forming the display module further includes: providing an optical lens and fixing the optical lens to the light-emitting surface.

[0109] The first ray and the second ray are monochromatic and dichromatic, respectively, and the monochromatic and dichromatic light constitute the three colors of red, green and blue. The light combining prism structure is used to adjust the propagation path of the first ray and the second ray entering the light combining prism structure, so that the first ray and the second ray are emitted through the light-emitting surface. The optical lens is used to receive the first ray and the second ray emitted from the light-emitting surface and collimate the first ray and the second ray before emitting them.

[0110] Please refer to the beam combining prism structure in step S10. Figure 4 As mentioned above, it will not be repeated here.

[0111] Please refer to the optical lens in step S20. Figure 4 As mentioned above, it will not be repeated here.

[0112] Please refer to the first display panel in step S30. Figure 5 and Figure 6 As mentioned above, it will not be repeated here.

[0113] Please refer to the second display panel in step S40. Figure 2 and Figure 3 As mentioned above, it will not be repeated here.

[0114] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A microdisplay panel, characterized by, The micro display panel comprises: a driving backplane; a pixel array arranged on the surface of the driving backplane, the pixel array comprising a plurality of light emitting units, each light emitting unit comprising at least two light emitting mesas arranged on the surface of the driving backplane in a vertical direction; at least two electrodes corresponding to the at least two light emitting mesas and electrically connected to the at least two light emitting mesas, the at least two electrodes being electrically connected to the driving backplane, the electrodes corresponding to the light emitting mesas above being electrically connected to the driving backplane through the light emitting mesas below; a top conductive layer arranged on the surface of each light emitting mesa, the top conductive layer being electrically connected to the light emitting mesas and shared by the light emitting mesas in the same layer; and a connection electrode arranged on the surface of the driving backplane and surrounding the pixel array, the connection electrode being electrically connected to the top conductive layer.

2. The microdisplay panel of claim 1, wherein, Further comprising: at least one through hole penetrating the light emitting mesas below, the electrodes corresponding to the light emitting mesas above penetrating the through hole.

3. The microdisplay panel of claim 2, wherein, Further comprising: an insulating layer arranged on the inner wall surface of the through hole, the electrodes being electrically isolated from the light emitting mesas below by the insulating layer.

4. The microdisplay panel of claim 3, wherein, Further comprising: a current spreading structure arranged between adjacent light emitting mesas in the same layer, the top conductive layer being further arranged on the top surface of the current spreading structure, the current spreading structure being electrically connected to the top conductive layer.

5. The microdisplay panel of claim 1, wherein, Further comprising: a microlens array arranged on the top of the pixel array, the microlens array comprising a plurality of microlenses corresponding to the plurality of light emitting units.

6. The microdisplay panel of claim 5, wherein, Further comprising: an encapsulation frame surrounding the driving backplane and arranged at the edge of the pixel array.

7. The microdisplay panel of claim 5, wherein, The size of the light emitting mesa in the direction parallel to the surface of the driving backplane is between 15 nm and 15 μm.

8. The microdisplay panel of claim 5, wherein, The size of the pixel array in the direction parallel to the surface of the driving backplane is between 500 μm and 50,000 μm.

9. The microdisplay panel of claim 5, wherein, The plurality of light emitting units in the pixel array are arranged in an m×n array, and the value of the m×n array includes one of 320×240, 640×480, 1600×1200, 1920×1080, and 2560×1440.

10. A display module, characterized by The light combination prism structure comprises a first light entrance surface, a second light entrance surface, and a light exit surface, the first light entrance surface and the light exit surface being opposite to each other; the first display panel is configured to emit first light, the first light being capable of entering the light combination prism structure through the first light entrance surface and being emitted out through the light exit surface; the second display panel is configured to emit second light, the second light being capable of entering the light combination prism structure through the second light entrance surface and being emitted out through the light exit surface; at least one of the first display panel and the second display panel is the micro display panel of any one of claims 1 to 9, and the micro display panel of any one of claims 1 to 9 is capable of emitting light of at least two different colors. ​ 11. The display module of claim 10, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. The first light and the second light are monochromatic light and dichromatic light, and the monochromatic light and the dichromatic light constitute red, green and blue three colors.

12. The display module of claim 10, wherein, Further comprising: An optical lens fixed to the light exit surface, the optical lens being configured to receive the first light and the second light emitted from the light exit surface and to collimate the first light and the second light before emitting.

13. The display module of claim 10, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. The light combination prism structure comprises a first prism and a second prism, and the inclined surface of the first prism and the inclined surface of the second prism are in abutment.

14. The display module of claim 13, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. The first prism comprises a first right-angled surface and a first inclined surface, and the second prism comprises a second right-angled surface and a second inclined surface, and the first inclined surface of the first prism and the second inclined surface of the second prism are in abutment; a group of opposite first right-angled surfaces and second right-angled surfaces are the first light entrance surface and the light exit surface, respectively, and another group of opposite first right-angled surfaces or second right-angled surfaces are the second light entrance surface.

15. The display module of claim 14, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. The first display panel is fixed to the first light entrance surface, and the second display panel is fixed to the second light entrance surface.

16. The display module of claim 13, wherein the display module is configured to be mounted on a display stand. The light combination prism structure further comprises an optical film located between the first inclined surface of the first prism and the second inclined surface of the second prism, the optical film being located on the propagation path of the first light and the second light, the optical film being configured to reflect or transmit the first light towards the light exit surface, and the optical film being configured to reflect or transmit the second light towards the light exit surface.

17. The display module of claim 11, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. The first light comprises monochromatic light, and the second light comprises dichromatic light.

18. An electronic device, comprising: Comprising: The display module according to any one of claims 10 to 17.

19. A method of forming a display module as claimed in any one of claims 10 to 17, characterised in that, Comprising: A light combination prism structure is provided, the light combination prism structure comprising a first light entrance surface, a second light entrance surface and a light exit surface, the first light entrance surface and the light exit surface being opposite to each other; A first display panel is provided and fixed to the first light entrance surface, wherein the first display panel is configured to emit first light, the first light being capable of entering the light combination prism structure through the first light entrance surface and being emitted through the light exit surface; A second display panel is provided and fixed to the second light entrance surface, wherein the second display panel is configured to emit second light, the second light being capable of entering the light combination prism structure through the second light entrance surface and being emitted through the light exit surface.

20. The method of claim 19, wherein the display module is formed by: Further comprising: An optical lens is provided and fixed to the light exit surface.

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