Micro-display panel, display module, and method for forming same, and electronic device

Abstract

A micro-display panel, a display module, and a method for forming same, and an electronic device. The display module comprises: a light combining prism structure, the light combining prism structure comprising a first incident surface, a second incident surface, and an emergent surface, and the first incident surface being opposite to the emergent surface; a first display panel, the first display panel being used for emitting first light, the first light being able to enter the light combining prism structure through the first incident surface and to be emitted via the emergent surface; and a second display panel, the second display panel being used for emitting second light, the second light being able to enter the light combining prism structure through the second incident surface and to be emitted via the emergent surface. At least one of the first display panel and the second display panel can emit light of at least two different colors. The display module consists of the light combining prism structure, the first display panel, and the second display panel, which can simplify the manufacturing process of the display module and reduce manufacturing costs.

Description

Micro display panel, display module, forming method thereof, and electronic device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on April 2, 2024, with application number 2024103999482 and invention name “Microdisplay panel, display module and method for forming same, 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-displays, and in particular to a micro-display panel, a display module, a method for forming the same, 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 were adopted for 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, making them widely used in near-eye displays.

[0004] Improving the performance and manufacturing process of inorganic micro-pixel light-emitting diodes is an issue that needs to be continuously addressed.

[0005] Summary of the Invention

[0006] The technical problem solved by the present invention is to provide a micro display panel, a display module and a method for forming the same, and an electronic device, so as to improve the performance and manufacturing process of inorganic micro pixel light emitting diodes.

[0007] In order to solve the above technical problems, the technical solution of the present invention provides a micro display panel, including: a driving backplane; a pixel array, the pixel array is arranged on the surface of the driving backplane, the pixel array includes a plurality of light-emitting units, the light-emitting units include at least two layers of light-emitting tables, the at least two layers of light-emitting tables are stacked on each other in a vertical direction and arranged on the surface of the driving backplane; at least two electrodes, the at least two electrodes are electrically connected to the at least two layers of light-emitting tables respectively, the at least two layers of electrodes are electrically connected to the driving backplane respectively, and the electrodes corresponding to the light-emitting tables located above pass through the light-emitting tables located below and are electrically connected to the driving backplane.

[0008] Correspondingly, the technical solution of the present invention also provides a display module, including: a light-combining prism structure, the light-combining prism structure including a first light incident surface, a second light incident surface and a light exit surface, the first light incident surface and the light exit 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 being emitted through the light exit surface; a second display panel, the second display panel being 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 being emitted through the light exit surface; wherein, at least one of the first display panel and the second display panel is the micro-display panel described above, and the micro-display panel is able to emit light of at least two different colors.

[0009] Correspondingly, the technical solution of the present invention further provides an electronic device, including: the above-mentioned display module.

[0010] Correspondingly, the technical solution of the present invention also provides a method for forming a display module, including: 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 exiting surface, the first light incident surface and the light exiting 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, and the first light ray can enter the light-combining prism structure through the first light incident surface and be emitted through the light exiting 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, and the second light ray can enter the light-combining prism structure through the second light incident surface and be emitted through the light exiting surface. Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0011] In the micro-display panel of the present invention, the light-emitting unit includes at least two layers of light-emitting tables stacked on each other. The electrodes corresponding to the light-emitting tables located on the upper side are electrically connected to the driving backplane by penetrating the light-emitting tables located on the lower side. The electrodes do not occupy additional area on the driving backplane, which can save the area of ​​the micro-display panel and further realize the miniaturization of the display panel.

[0012] In the display module and method for forming a display module of the present invention, the first display panel emits a first light, the second display panel emits a second light, and 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, simplifying the display module manufacturing process and reducing manufacturing costs.

[0013] Furthermore, the light-combining prism structure includes a first prism and a second prism. The light-combining prism structure is formed by laminating the oblique surface of the first prism and the oblique surface of the second prism, which further simplifies the manufacturing process of the light-combining prism structure and reduces manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a schematic structural diagram of a micro display module in one embodiment;

[0015] 2 and 3 are schematic structural diagrams of a micro display panel according to an embodiment of the present invention;

[0016] 4 to 6 are schematic structural diagrams of a display module according to an embodiment of the present invention;

[0017] FIG. 7 is a flow chart showing a method for forming a display module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] As described in the background art, improving the performance and manufacturing process of inorganic micro-pixel light-emitting diodes is an issue that needs to be continuously addressed. This will now be analyzed and explained in conjunction with specific embodiments.

[0019] FIG1 is a schematic structural diagram of a micro display module in one embodiment.

[0020] 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 corresponding to the three light incident surfaces of the light-combining prism 1p. The light-combining prism 1p includes a first optical film 14p and a second optical film 12p. The light emitted by the first micro-display panel 31p can pass through the first optical film 14p and the second optical film 12p and be emitted through the light-emitting surface of the light-combining prism 1p; the light emitted by the second micro-display panel 32p is reflected by the first optical film 14p and then propagated to the light-emitting surface of the light-combining prism 1p and then emitted; the light emitted by the third micro-display panel 33p is reflected by the second optical film 12p and then propagated to the light-emitting surface of the light-combining prism 1p and then emitted; the optical lens 2p is arranged corresponding to the light-emitting surface of the light-combining prism 1p.

[0021] In the micro-display module, the light-combining prism 1p is assembled from four triangular prisms. Two optical films are required at the locations where the four prisms meet to reflect or transmit light emitted by the first, second, and third display panels 31p, 32p, and 33p, resulting in a complex manufacturing process and high costs. Furthermore, three alignment operations are required to secure the first, second, and third micro-display panels 31p, 32p, and 33p to the three light-incident surfaces of the light-combining prism 1p, further complicating the manufacturing process and increasing costs.

[0022] To address the aforementioned issues, the present invention provides a micro-display panel, a display module, a method for forming the same, and an electronic device. A first display panel emits a first light, a second display panel emits a second light, and at least one of the first and second display panels can emit at least two different colors of light. The display module, comprising a light-combining prism structure, a first display panel, and a second display panel, simplifies the display module's manufacturing process and reduces manufacturing costs.

[0023] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] 2 and 3 are schematic structural diagrams of a micro display panel according to an embodiment of the present invention.

[0025] Please refer to FIG. 2 and FIG. 3 , FIG. 3 is a schematic cross-sectional view of FIG. 2 along the section line AA1 , wherein the micro display panel 40 includes:

[0026] driving backplane 411;

[0027] A pixel array, the pixel array being disposed on a surface of the driving backplane 411, the pixel array comprising a plurality of light-emitting units, each light-emitting unit comprising at least two layers of light-emitting mesas, the at least two layers of light-emitting mesas being stacked vertically on each other and disposed on the surface of the driving backplane 411;

[0028] At least two electrodes, the at least two electrodes are electrically connected to the at least two layers of light-emitting mesas, and the at least two layers of electrodes are electrically connected to the driving backplane 411 respectively.

[0029] The electrodes corresponding to the upper light-emitting mesas pass through the lower light-emitting mesas and are electrically connected to the driving backplane 411 .

[0030] The micro display panel, the light-emitting unit includes at least two layers of light-emitting tables stacked on each other, the electrode corresponding to the light-emitting table located on the upper side is electrically connected to the driving backplane by passing through the light-emitting table located on the lower side. The electrode does not occupy additional area on the driving backplane, can save the area of ​​the micro display panel, and further realize the miniaturization of the display panel.

[0031] Please continue to refer to Figure 2. The micro display panel 40 includes: a display area 41, a connecting electrode 42 surrounding the display area 41, and a packaging frame 43 surrounding the connecting electrode 42. The driving backplane 411 is located in the display area 41, and the connecting electrode 42 is located between the display area 41 and the packaging frame 43.

[0032] 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 suitable for electrically connecting to external equipment.

[0033] The packaging frame 43 is disposed around the outer side of the connection electrode 42 to 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 comprises a flexible circuit board. The interface type of the connector 45 includes a MIPI (Mobile Industry Processor Interface) interface.

[0034] 3 , in this embodiment, the light-emitting unit includes two light-emitting mesas, namely, a first light-emitting mesas 412 a and a second light-emitting mesas 412 b located on the first light-emitting mesas 412 a , and the first light-emitting mesas 412 a and the second light-emitting mesas 412 b are electrically isolated from each other.

[0035] The first light-emitting mesa 412 a 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. The first semiconductor layer and the second semiconductor layer have different conductivity types.

[0036] The second light-emitting mesa 412 b 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. The third semiconductor layer and the fourth semiconductor layer have different conductivity types.

[0037] The first light-emitting mesa 412a and the second light-emitting mesa 412b respectively emit monochromatic light, so that the micro display panel can emit two-color light, and the monochromatic light is one of the three colors of red, green and blue.

[0038] When the first light-emitting mesa 412a emits red light, the second light-emitting mesa 412b emits blue light or green light. The projected area of ​​the first light-emitting mesa 412a on the driving backplane 411 is larger than the projected area of ​​the second light-emitting mesa 412b on the driving backplane 411, thereby improving the light-emitting efficiency.

[0039] In this embodiment, the light emitting unit is only used to emit two-color light.

[0040] In other embodiments, the light emitting unit can emit three-color light, and the light emitting unit can selectively emit two-color light among the three-color light.

[0041] In other embodiments, the light-emitting unit may further include three, four or more layers of light-emitting mesas.

[0042] Please continue to refer to Figure 3. In this embodiment, the micro display panel also includes: a first top conductive layer 413a electrically connected to the multiple first light-emitting mesas 412a, the first top conductive layer 413a is located on the top surfaces of the multiple first light-emitting mesas 412a, the first light-emitting mesas 412a located on the same layer share the first top conductive layer 413a, and the first top conductive layer 413a is 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 mesas 412b are located on the first isolation layer 415c, and the first isolation layer 415c is used to electrically isolate the first light-emitting mesas 412a and the second light-emitting mesas 412b.

[0043] The material of the first top conductive layer 413a includes one or more of a TCO (Transparent Conductive Oxide) film, an ITO (Indium Tin Oxide) film, an AZO (Antimony Doped Zinc Oxide) film, an ATO (Antimony Doped Tin Oxide) film, and an FTO (Fluorine Doped Tin Oxide) film. The first top conductive layer 413a is a transparent conductive material to avoid blocking light emitted by the light-emitting unit.

[0044] Please continue to refer to Figure 3. In this embodiment, the electrodes include: a first electrode 4111a, the first electrode 4111a is located in the driving backplane 411 at the bottom of the first light-emitting mesa 412a, and one first electrode 4111a is electrically connected to one first light-emitting mesa 412a; a second electrode 4111b, part of the second electrode 4111b is located in the driving backplane 411 at the bottom of the second light-emitting mesa 412b, the second electrode 4111b passes through the first light-emitting mesa 412a, the first top conductive layer 413a and the first isolation layer 415c from the driving backplane 411 and contacts the bottom of the second light-emitting mesa 412b, one second electrode 4111b is electrically connected to one third light-emitting mesa 412b, and the second electrode 4111b is electrically isolated from the first light-emitting mesa 412a.

[0045] The material of the first electrode 4111a includes metal. The material of the first electrode 4111a includes metal, and the metal includes one or more of Al, Au, Rh, Ag, Cr, Ti, Pt, Sn, Cu, AuSn, TiW, etc.

[0046] The micro display panel further includes: at least one through hole penetrating the light-emitting mesa below, wherein the electrode corresponding to the light-emitting mesa located above passes through the through hole; and an insulating layer located on the inner wall surface of the through hole, wherein the electrode is electrically isolated from the light-emitting mesa below by the insulating layer.

[0047] In this embodiment, the micro display panel includes: a through hole 46 that passes through the first light-emitting mesa 412a, the first top conductive layer 413a and the first isolation layer 415c; an insulating layer 415d located on the side wall surface of the through hole 46, and the fifth electrode structure 4111b is located in the through hole 46. The insulating layer 415d electrically isolates the second electrode 4111b from the first light-emitting mesa 412a and the first top conductive layer 413a.

[0048] Please continue to refer to Figure 3. In this embodiment, the micro display panel also includes: a second top conductive layer 413b electrically connected to the multiple second light-emitting mesas 412b, the second top conductive layer 413b is located on the top surfaces of the multiple second light-emitting mesas 412b and the surface of the first isolation layer 415c, the second light-emitting mesas 412b located on 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.

[0049] The material of the second top conductive layer 413b includes one or more of a TCO (Transparent Conductive Oxide) film, an ITO (Indium Tin Oxide) film, an AZO (Antimony Doped Zinc Oxide) film, an ATO (Antimony Doped Tin Oxide) film, and an FTO (Fluorine Doped Tin Oxide) film. The second top conductive layer 413b is a transparent conductive material to avoid blocking light emitted by the light-emitting unit.

[0050] The micro display panel further includes a current spreading structure disposed between adjacent light-emitting mesas in the same layer. The top conductive layer is also located on a top surface of the current spreading structure, and the current spreading structure is electrically connected to the top conductive layer.

[0051] Please continue to refer to Figure 3. In this embodiment, the micro display panel also includes: a plurality of first current spreading structures 414a arranged on one side of the driving backplane 411, one first current spreading structure 414a is located between two adjacent first light-emitting mesas 412a; the first top conductive layer 413a is also located on the top surface of the first current spreading structure 414a, and the first top conductive layer 413a is electrically connected to the plurality of first current spreading structures 414a; a plurality of second current spreading structures 414b, one second current spreading structure 414b is arranged between adjacent second light-emitting mesas 412b, and the second current spreading structure 414b is located on the first isolation layer 415c on the top of the first current spreading structure 414a; the second top conductive layer 413b is also located on the top surface of the plurality of second current spreading structures 414b, and the second top conductive layer 413b is electrically connected to the plurality of second current spreading structures 414b.

[0052] The first current spreading structure 414a can increase the current flow path adjacent to the first light-emitting mesa 412a, thereby achieving a current spreading effect. The second current spreading structure 414b can increase the current flow path adjacent to the second light-emitting mesa 412b, thereby achieving a current spreading effect.

[0053] The material of the first current spreading structure 414a includes a metal, and the metal includes one or more of aluminum, gold, silver, chromium, titanium, platinum, copper, rhodium, tin, gold-tin, titanium-tungsten, etc. The material of the second current spreading structure 414b includes a metal, and the metal includes one or more of aluminum, gold, silver, chromium, titanium, platinum, copper, rhodium, tin, gold-tin, titanium-tungsten, etc.

[0054] Please continue to refer to Figure 3. In this embodiment, the micro display panel also includes: a second isolation layer 415a located on the side wall surface of the first light-emitting mesa 412a, and the first top conductive layer 413a is also located on the top surface of the second isolation layer 415a; a third isolation layer 415b located on the side wall surface of the second light-emitting mesa 412b, and the second top conductive layer 413b is also located on the top surface of the third isolation layer 415b.

[0055] The second isolation layer 415a can prevent the first top conductive layer 413a from contacting the side of the first light-emitting mesa 412a, and in particular can prevent the first top conductive layer 413a from contacting the side of the bottom portion of the first light-emitting mesa 412a, thereby preventing the top and bottom of the first light-emitting mesa 412a from being short-circuited; the third isolation layer 415b can prevent the second top conductive layer 413b from contacting the side of the second light-emitting mesa 412b, and in particular can prevent the second top conductive layer 413b from contacting the side of the bottom portion of the second light-emitting mesa 412b, thereby preventing the top and bottom of the second light-emitting mesa 412b from being short-circuited.

[0056] The material of the second isolation layer 415a is transparent, and the material of the second isolation layer 415a includes a combination of one or more 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 a combination of one or more of silicon oxide, silicon oxynitride, aluminum oxide and silicon nitride.

[0057] In this embodiment, the microdisplay panel 40 further includes a microlens array disposed on top of the pixel array. The microlens array includes a plurality of microlenses 416. The plurality of microlenses 416 are disposed corresponding to the plurality of light-emitting units. Light emitted by the first light-emitting mesa 412a and the second light-emitting mesa 412b passes through the corresponding microlenses 416 and then exits.

[0058] In this embodiment, the size of the light-emitting mesa in a direction parallel to the surface of the driving backplane 411 is between 15 nm and 15 μm.

[0059] In this embodiment, the size of the pixel array in a direction parallel to the surface of the driving backplane 411 is between 500 μm and 50,000 μm.

[0060] 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.

[0061] The display panel described above has a very small volume, with length and width dimensions ranging from 500μm to 50,000μm. The area of ​​the light-emitting region of the display panel is very small, such as 1mm×1mm, 2.64mm×2.02mm, 3mm×5mm, etc. The light-emitting region of the display panel includes a plurality of micro-LED pixels arranged in an array, and the specific pixel arrangement may be one of 320×240, 640×480, 1600×1200, 1920×1080, and 2560×1440. The size of a single micro-LED pixel is between 100nm and 100 microns. In some embodiments, the size of a single micro-LED pixel is between 150nm and 15 microns. In some embodiments, the size of a single micro-LED pixel can also be less than 10 microns.

[0062] 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 and can obtain signals such as image data from the outside world and control the corresponding micro-LEDs to emit light or not. 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 panel (221, 231a, 231b, 231c) integrates a frame buffer, a column driver circuit, and a row driver 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 be stored in the first pixel storage area of ​​the frame buffer. The column driver 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 driver 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 grayscales. 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 to this application.

[0063] 4 to 6 are schematic structural diagrams of a display module according to an embodiment of the present invention.

[0064] 4 , the display module includes: a light-combining prism structure 10 , the light-combining prism structure 10 including a first light incident surface, a second light incident surface, and a light emitting surface 13 , wherein the first light incident surface and the light emitting surface 13 are opposite to each other;

[0065] a first display panel 30 , configured to emit a first light ray, the first light ray being able to enter the light-combining prism structure 10 through the first light incident surface and being emitted through the light emitting surface 13 ;

[0066] The second display panel 40 is configured to emit a second light ray. The second light ray can enter the light-combining prism structure 10 through the second light incident surface and be emitted through the light emitting surface 13 .

[0067] The display module is composed 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 the manufacturing cost.

[0068] In this embodiment, the second display panel 40 is a micro display panel as shown in FIG. 2 and FIG. 3 . The second display panel 40 can emit light of two different colors. For the structure of the second display panel 40 , please refer to the contents in FIG. 2 and FIG. 3 , which will not be repeated here.

[0069] In this embodiment, the first display panel 30 is configured to emit monochromatic light, the first light and the second light are monochromatic light and bichromatic light, respectively, and the monochromatic light and bichromatic light constitute red, green, and blue.

[0070] For example, the first light is red, and the second light is blue and green; the first light is blue, and the second light is red and green; the first light is green, and the second light is blue and red.

[0071] In other embodiments, the first display panel is configured to emit two-color light, the structure of the first display panel is as described in FIG2 and FIG3 , and the second display panel is configured to emit monochromatic light.

[0072] In this embodiment, the first display panel 30 is fixed to the first light incident surface; and the second display panel 40 is fixed to the second light incident surface.

[0073] Please continue to refer to Figure 4. In 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. 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 the first light incident surface and the light exit surface 13, respectively. The other set of the first right-angled surface or the second right-angled surface is the second light incident surface.

[0074] In this embodiment, the first prism 15a and the second prism 15b are fixed by a fixing frame 16. The light-combining prism structure 10 is formed by laminating the first prism 15a and the second prism 15b, which further simplifies the manufacturing process of the light-combining prism structure 10 and reduces the manufacturing cost.

[0075] The light-combining prism structure 10 is made of quartz, optical glass (N-BK7), calcium fluoride, zinc selenide, or germanium. The light-combining prism structure 10 is highly transparent so that the first light emitted by the first display panel 30 and the second light emitted by the second display panel 40 can enter the light-combining prism structure 10 and be emitted.

[0076] In this embodiment, the light-combining prism structure 10 also 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 and the second light, the optical film 14 is used to reflect or transmit the first light and then emit it toward the light-emitting surface 13, and the optical film 14 is used to reflect or transmit the second light and then emit it toward the light-emitting surface 13.

[0077] The wavelengths of the first light and the second light are different. The optical film 14 is an optically designed multilayer dielectric thin film structure. The multilayer dielectric thin film structure includes two or three dielectric materials with different refractive indices stacked with a certain thickness and number of layers to achieve different reflection or transmission effects for different wavelengths.

[0078] In this embodiment, the first display panel 30 emits a first light ray which enters the light-combining prism structure 10 from the first light incident surface, and the optical film 14 is used to transmit the first light ray so that the first light ray passes through the light-combining prism structure 10 and is emitted from the light-emitting surface 13; the second display panel 40 emits a second light ray which enters the light-combining prism structure 10 from the second light incident surface, and the optical film 14 is used to reflect the second light ray so that the second light ray passes through the light-combining prism structure 10 and is emitted from the light-emitting surface 13.

[0079] Continuing with FIG4 , the display module further includes an optical lens 20 fixed to the light-emitting surface 13 . The optical lens 20 is configured to receive the first light and the second light emitted from the light-emitting surface 13 , collimate the first light and the second light, and then emit the collimated light. The center of the optical lens 20 is aligned with the center of the light-combining prism structure 10 .

[0080] Please refer to Figures 5 and 6. Figure 6 is a schematic diagram of the cross-sectional structure of Figure 5 along the section line AA1. The first display panel 30 includes: a first display area 31, a first electrode area 32 and a first packaging frame 33. The first electrode area 32 surrounds the first display area 31, and the first packaging frame 33 surrounds the first electrode area 32. The first electrode area 32 is located between the first display area 31 and the first packaging frame 33.

[0081] In this embodiment, the first display panel 30 also 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, and the first connector 35 is suitable for being electrically connected to an external device to control the lighting or extinguishing of the Micro LED in the first display area 31.

[0082] The first packaging frame 33 is disposed around the outside of the first electrode area 32, thereby protecting the first display area 31 and improving the stability of the electrical connection between the first display area 31 and the first circuit board 34. Preferably, the first circuit board 34 comprises a flexible circuit board. The interface type of the first connector 35 comprises a MIPI (Mobile Industry Processor Interface) interface.

[0083] The first display panel 30 includes LED, OLED, AMOLED, MiniLED or MicroLED.

[0084] In this embodiment, the first display panel 30 includes MicroLEDs.

[0085] In this embodiment, the first display panel 30 is only used to emit monochromatic light.

[0086] In other embodiments, the first display panel can emit two-color light or three-color light, and the first display panel can selectively emit single-color light in the two-color light or the three-color light.

[0087] 6 , the first display area 31 includes a first driving backplane 311 and a plurality of third light-emitting mesas 312 disposed on one side of the first driving backplane 311 . The third light-emitting mesas 312 are electrically connected to the first driving backplane 311 .

[0088] 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. The fifth semiconductor layer and the sixth semiconductor layer have different conductivity types.

[0089] The conductivity type of the fifth semiconductor layer includes N type or P type, and the conductivity type of the sixth semiconductor layer includes P type or N type.

[0090] In this embodiment, the third light-emitting mesa 312 is configured to emit red light, blue light, or green light.

[0091] In this embodiment, the first display area 31 further includes: a plurality of third electrodes 3111, wherein the third electrodes 3111 are located in the first driving backplane 311 at the bottom of the third light-emitting mesa 312, and one third electrode 3111 is electrically connected to one third light-emitting mesa 312; a third top conductive layer 313 electrically connected to the plurality of third light-emitting mesas 312, wherein the third top conductive layer 313 is located on the top surface of the plurality of third light-emitting mesas 312, and the third top conductive layer 313 is electrically connected to the first electrode area 32.

[0092] The material of the third electrode 3111 includes metal, and the metal includes one or more of Al, Au, Rh, Ag, Cr, Ti, Pt, Sn, Cu, AuSn, TiW, etc.

[0093] The material of the third top conductive layer 313 includes one or more of a TCO (Transparent Conductive Oxide) film, an ITO (Indium Tin Oxide) film, an AZO (Antimony Doped Zinc Oxide) film, an ATO (Antimony Doped Tin Oxide) film, and an FTO (Fluorine Doped Tin Oxide) film. The third top conductive layer 313 is a transparent conductive material to avoid blocking the light emitted by the third light-emitting mesa 312.

[0094] In this embodiment, the first display area 31 further includes: a plurality of third current spreading structures 314 arranged on one side of the first driving backplane 311, and one of the third current spreading structures 314 is located between two adjacent third light-emitting mesas 312; the third top conductive layer 313 is also located on the top surfaces of the plurality of third current spreading structures 314, and the third top conductive layer 313 is electrically connected to the plurality of third current spreading structures 314.

[0095] The third current spreading structure 314 can increase the current spreading between adjacent third light-emitting mesas 312 , reduce the resistance between adjacent third light-emitting mesas 312 , and reduce loss.

[0096] The material of the third current spreading structure 314 includes metal, and the metal includes one or more of aluminum, gold, silver, chromium, titanium, platinum, copper, rhodium, tin, gold-tin, titanium-tungsten, etc.

[0097] In other embodiments, the third current spreading structure may not be included.

[0098] In this embodiment, the first display area 31 further includes a third isolation layer 315 located on the sidewall surface of the third light-emitting mesa 312 , and the third top conductive layer 313 is also located on the top surface of the third isolation layer 315 .

[0099] The third isolation layer 315 can prevent the third top conductive layer 313 from contacting the side of the third light-emitting mesa 312, and especially prevent the third top conductive layer 313 from contacting the side of the bottom portion of the third light-emitting mesa 312, thereby preventing the top and bottom of the third light-emitting mesa 312 from being short-circuited.

[0100] 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.

[0101] In this embodiment, the first display panel 30 further includes a plurality of first microlenses 316 disposed on top of the third light-emitting mesas 312. One first microlens 316 corresponds to one third light-emitting mesas 312. Light emitted from the third light-emitting mesas 312 passes through the corresponding first microlens 316 and then exits.

[0102] The first microlens 316 is made of glass or resin.

[0103] Correspondingly, an embodiment of the present invention further provides an electronic device, which includes the display module as described in FIG. 4 to FIG. 6 .

[0104] 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, and the light emitted by the color micro light engine is projected on a transparent panel; the near-eye display device includes AR (Augmented Reality), VR (Virtual Reality), MR (Mediated Reality), etc. The near-eye display device includes a wearable device and a color micro light engine provided on the wearable device, and the light emitted by the color micro light engine can be projected on the wearable device.

[0105] FIG. 7 is a flow chart showing a method for forming a display module according to an embodiment of the present invention.

[0106] Referring to FIG. 7 , the method for forming the display module includes:

[0107] Step S10: providing a light-combining prism structure, wherein the light-combining prism structure includes a first light incident surface, a second light incident surface, and a light emitting surface, wherein the first light incident surface and the light emitting surface are opposite to each other;

[0108] Step S20: providing a first display panel and fixing the first display panel relative to the first light incident surface, wherein the first display panel is configured to emit a first light, the first light being able to enter the light-combining prism structure through the first light incident surface and be emitted through the light emitting surface;

[0109] 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, and the second light can enter the light-combining prism structure through the second light incident surface and be emitted through the light emitting surface.

[0110] 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.

[0111] The first light and the second light are monochromatic light and dichromatic light respectively, and the monochromatic light and the dichromatic light constitute the three colors of red, green and blue. The light-combining prism structure is used to adjust the propagation paths of the first light and the second light entering the light-combining prism structure so that the first light and the second light are emitted through the light-emitting surface. The optical lens is used to receive the first light and the second light emitted from the light-emitting surface and collimate the first light and the second light before emitting them.

[0112] The structure of the light-combining prism in step S10 is described in FIG4 , and will not be further described here.

[0113] The optical lens in step S20 is described in FIG4 and will not be described in detail here.

[0114] The first display panel in step S30 is described with reference to FIG. 5 and FIG. 6 , and will not be described in detail here.

[0115] The second display panel in step S40 is described with reference to FIG. 2 and FIG. 3 , and will not be described in detail here.

[0116] 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 panel, characterized in that: include: Driver backplane; A pixel array, the pixel array being disposed on a surface of the driving backplane, the pixel array comprising a plurality of light-emitting units, the light-emitting units comprising at least two layers of light-emitting mesas, the at least two layers of light-emitting mesas being stacked vertically on each other and disposed on the surface of the driving backplane; At least two electrodes, the at least two electrodes are electrically connected to the at least two layers of light-emitting mesas, the at least two layers of electrodes are electrically connected to the driving backplane respectively, and the electrodes corresponding to the light-emitting mesas located above pass through the light-emitting mesas located below and are electrically connected to the driving backplane.

2. The micro display panel according to claim 1, wherein: Also includes: At least one through hole is formed through the lower light-emitting mesa, and the electrode corresponding to the upper light-emitting mesa is formed through the through hole.

3. The micro display panel according to claim 2, wherein: Also includes: An insulating layer is located on the inner wall surface of the through hole, and the electrode is electrically isolated from the light-emitting mesa below by the insulating layer.

4. The micro display panel according to claim 3, wherein: Also includes: A top conductive layer is provided on the surface of each light-emitting mesa, the top conductive layer is electrically connected to the light-emitting mesa, and the light-emitting mesas located on the same layer share the same top conductive layer.

5. The micro display panel according to claim 4, wherein: Also includes: The current spreading structure is arranged between adjacent light-emitting mesas in the same layer, the top conductive layer is also located on the top surface of the current spreading structure, and the current spreading structure is electrically connected to the top conductive layer.

6. The micro display panel according to claim 4, wherein: Also includes: A connecting electrode is disposed on the surface of the driving backplane and surrounds the pixel array, and the connecting electrode is electrically connected to the top conductive layer.

7. The micro display panel according to claim 1, wherein: Also includes: A microlens array is arranged on top of the pixel array, wherein the microlens array includes a plurality of microlenses, and the plurality of microlenses are arranged corresponding to the plurality of light-emitting units.

8. The micro display panel according to claim 7, wherein: Also includes: A packaging frame surrounds the driving backplane and is arranged at an edge of the pixel array.

9. The micro display panel according to claim 7, wherein: The size of the light-emitting mesa in a direction parallel to the surface of the driving backplane is between 15 nm and 15 μm.

10. The micro display panel according to claim 7, wherein: The size of the pixel array in a direction parallel to the surface of the driving backplane is between 500 μm and 50,000 μm.

11. The micro display panel according to claim 7, wherein: The multiple 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.

12. A display module, characterized in that: include: A light-combining prism structure, comprising a first light incident surface, a second light incident surface, and a light exiting surface, wherein the first light incident surface and the light exiting surface are opposite to each other; a first display panel, configured to emit a first light ray, wherein the first light ray can enter the light-combining prism structure through the first light incident surface and be emitted through the light emitting surface; a second display panel, the second display panel being configured to emit a second light, the second light being capable of entering the light-combining prism structure through the second light incident surface and being emitted through the light emitting surface; Wherein, at least one of the first display panel and the second display panel is a micro display panel according to any one of claims 1 to 11, and the micro display panel according to any one of claims 1 to 11 can emit light of at least two different colors. Wire.

13. The display module according to claim 12, wherein: The first light and the second light are monochromatic light and dichromatic light respectively, and the monochromatic light and dichromatic light constitute the three colors of red, green and blue.

14. The display module according to claim 12, wherein: Also includes: An optical lens is fixed to the light-emitting surface, and is used for receiving the first light and the second light emitted from the light-emitting surface, and collimating the first light and the second light before emitting them.

15. The display module according to claim 12, wherein: The light-combining prism structure includes 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 contact with each other.

16. The display module according to claim 15, wherein: The first prism includes a first right-angled surface and a first oblique surface, and the second prism includes a second right-angled surface and a second oblique surface, and the first oblique surface of the first prism and the second oblique surface of the second prism are in contact with each other; an opposite group of the first right-angled surface and the second right-angled surface are respectively the first light incident surface and the light exit surface, and another opposite group of the first right-angled surface or the second right-angled surface is the second light incident surface.

17. The display module according to claim 16, wherein: The first display panel is fixed to the first light incident surface; the second display panel is fixed to the second light incident surface.

18. The display module according to claim 15, wherein: The light-combining prism structure also includes: 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 is located on the propagation path of the first light and the second light, the optical film is used to reflect or transmit the first light and then emit it toward the light-emitting surface, and the optical film is used to reflect or transmit the second light and then emit it toward the light-emitting surface.

19. The display module according to claim 13, wherein: The first light includes monochromatic light, and the second light includes dichromatic light.

20. An electronic device, characterized in that: include: The display module according to any one of claims 12 to 19.

21. A method for forming a display module according to any one of claims 12 to 19, characterized in that: include: A light-combining prism structure is provided, the light-combining prism structure comprising a first light incident surface, a second light incident surface, and a light exiting surface, wherein the first light incident surface and the light exiting surface are 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 configured to emit a first light, the first light being able to enter the light-combining prism structure through the first light incident surface and be emitted through the light emitting surface; A second display panel is provided and fixedly arranged relative to the second light incident surface, wherein the second display panel is used to emit a second light, and the second light can enter the light-combining prism structure through the second light incident surface and be emitted through the light emitting surface.

22. The method for forming a display module according to claim 21, wherein: Also includes: An optical lens is provided and fixed to the light emitting surface.

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