Display panel and display device

Abstract

This invention provides a display panel and a display device. The display panel includes a driving substrate and a light-emitting device group. The driving substrate includes multiple first bonding electrodes and multiple second bonding electrodes. The light-emitting device group is disposed on one side of the driving substrate and includes multiple light-emitting devices. Each light-emitting device includes a first connecting electrode and a second connecting electrode. The first connecting electrode is electrically connected to the first bonding electrode, and the second connecting electrode is electrically connected to the second bonding electrode. The multiple light-emitting devices include a first light-emitting device, a second light-emitting device, and a third light-emitting device arranged along the thickness direction of the display panel, so that the multi-layer light-emitting devices are stacked in the thickness direction of the display panel. The second connecting electrodes in the second and third light-emitting devices are electrically connected to the second bonding electrodes located on different sides of the light-emitting device group, respectively, so as to realize the individual driving of the light-emitting devices, thereby improving the pixel integration, reducing the pixel pitch, and realizing a high PPI display.

Description

Technical Field

[0001] This utility model relates to the field of display technology, and in particular to a display panel and display device. Background Technology

[0002] Micro-LED displays, with their advantages of high brightness, long lifespan, and low power consumption, are widely considered an ideal display solution for future wearable consumer electronics products such as Augmented Reality (AR) and Virtual Reality (VR). Currently, to achieve full-color display, mass transfer technology is typically used to transfer red, green, and blue Micro-LED chips onto a silicon-based driving backplane, precisely corresponding them to the pixel driving circuit array, thereby assembling a full-color display panel.

[0003] However, mass transfer technology requires precise alignment and bonding of millions to tens of millions of micro LED chips with driving circuits, resulting in insufficient process stability, low transfer yield, low production efficiency, and high cost. In addition, due to limitations in pixel size, chip boundaries, and alignment accuracy, mass transfer technology cannot achieve ultra-high pixel density and cannot simultaneously meet the stringent performance requirements of AR / VR applications for displays, such as high PPI, high brightness, and long lifespan. Utility Model Content

[0004] Embodiments of this utility model provide a display panel and display device for achieving a compact arrangement of multi-layer light-emitting devices, thereby improving pixel integration, reducing pixel pitch, and supporting high PPI display.

[0005] To achieve the above functions, the technical solution provided by this utility model embodiment is as follows:

[0006] An embodiment of this utility model provides a display panel, comprising:

[0007] A driving substrate includes multiple first bonding electrodes and multiple second bonding electrodes;

[0008] A light-emitting device group is disposed on one side of the driving substrate. The light-emitting device group includes multiple light-emitting devices. Each light-emitting device includes a first connecting electrode and a second connecting electrode. The first connecting electrode is electrically connected to a first bonding electrode, and the second connecting electrode is electrically connected to a second bonding electrode.

[0009] The plurality of light-emitting devices include a first light-emitting device, a second light-emitting device, and a third light-emitting device disposed along the thickness direction of the display panel. The orthographic projection of the second bonding electrode connected to the second light-emitting device and the third light-emitting device on the driving substrate is located on different sides of the orthographic projection of the light-emitting device group on the driving substrate.

[0010] According to one embodiment of the present invention, in a group of light-emitting devices, the first connecting electrodes of a plurality of light-emitting devices are all electrically connected to the same first bonding electrode, and the second connecting electrodes of a plurality of light-emitting devices are all electrically connected to different second bonding electrodes.

[0011] According to one embodiment of the present invention, the driving substrate includes a first contact point, a second contact point, and a third contact point, wherein the first contact point, the second contact point, and the third contact point are respectively configured to correspond to different second bonding electrodes;

[0012] In this configuration, the first connecting electrode of the first light-emitting device is connected to the first contact point, the first connecting electrode of the second light-emitting device is connected to the second contact point, and the first connecting electrode of the third light-emitting device is connected to the third contact point.

[0013] According to one embodiment of the present invention, the display panel further includes a first filter layer and a second filter layer, wherein the first filter layer is disposed between the second connecting electrode of the first light-emitting device and the driving substrate, and the second filter layer is disposed between the second connecting electrode of the first light-emitting device and the first connecting electrode of the second light-emitting device.

[0014] The first filter layer includes a first via corresponding to the second contact point, the second filter layer includes a second via corresponding to the second contact point, and the first connection electrode of the second light-emitting device is connected to the second contact point through the first via and the second via.

[0015] According to one embodiment of the present invention, the display panel further includes a third filter layer and a fourth filter layer. The third filter layer is disposed between the second connecting electrode of the second light-emitting device and the second filter layer, and the fourth filter layer is disposed between the first connecting electrode of the third light-emitting device and the third filter layer.

[0016] The third filter layer includes a third via corresponding to the third contact point, the fourth filter layer includes a fourth via corresponding to the third contact point, the second filter layer includes a fifth via corresponding to the third contact point, and the first filter layer includes a sixth via corresponding to the third contact point. The first connecting electrode of the third light-emitting device is connected to the third contact point through the fourth via, the third via, the fifth via, and the sixth via.

[0017] According to one embodiment of the present invention, the driving substrate includes a fourth contact point, which is disposed corresponding to the first bonding electrode;

[0018] The first filter layer includes a seventh via corresponding to the fourth contact point, the second filter layer includes an eighth via corresponding to the second connecting electrode of the first light-emitting device, and the third filter layer includes a ninth via corresponding to the second connecting electrode of the first light-emitting device.

[0019] The second connection electrode of the first light-emitting device is connected to the fourth contact point through the seventh via; the first connection electrode of the second light-emitting device is connected to the second connection electrode of the first light-emitting device through the eighth via and the ninth via.

[0020] According to one embodiment of the present invention, the display panel further includes a fifth filter layer, which is disposed between the second connecting electrode of the third light-emitting device and the fourth filter layer;

[0021] The fourth filter layer includes a tenth via corresponding to the second connection electrode of the second light-emitting device, and the fifth filter layer includes an eleventh via corresponding to the second connection electrode of the second light-emitting device.

[0022] The second connection electrode of the third light-emitting device is connected to the second connection electrode of the second light-emitting device through the tenth via and the eleventh via.

[0023] According to one embodiment of the present invention, the second filter layer is used to reflect light having a first wavelength, and the fourth filter layer is used to reflect light having a second wavelength.

[0024] According to one embodiment of the present invention, the display panel includes a filter layer disposed between two adjacent light-emitting devices; the filter layer includes a plurality of vias, and the light-emitting devices are connected to the first bonding electrode and the second bonding electrode through the vias;

[0025] The angle between the sidewall of the via and the bottom surface of the filter layer near the driving substrate is greater than or equal to 85 degrees and less than or equal to 90 degrees.

[0026] An embodiment of this utility model provides a display device, which includes any of the display panels described above.

[0027] The beneficial effects of this utility model embodiment:

[0028] This invention provides a display panel and a display device. The display panel includes a driving substrate and a light-emitting device group. The driving substrate includes multiple first bonding electrodes and multiple second bonding electrodes. The light-emitting device group is disposed on one side of the driving substrate and includes multiple light-emitting devices. Each light-emitting device includes a first connecting electrode and a second connecting electrode. The first connecting electrode is electrically connected to the first bonding electrode, and the second connecting electrode is electrically connected to the second bonding electrode. The multiple light-emitting devices include a first light-emitting device, a second light-emitting device, and a third light-emitting device arranged along the thickness direction of the display panel, so that the multi-layer light-emitting devices are stacked in the thickness direction of the display panel. The second connecting electrodes in the second and third light-emitting devices are electrically connected to the second bonding electrodes located on different sides of the light-emitting device group, respectively, so as to realize the individual driving of the light-emitting devices, thereby improving the pixel integration, reducing the pixel pitch, and realizing a high PPI display. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the display panel provided in an embodiment of the present utility model;

[0031] Figure 2 Provided for the embodiments of this utility model Figure 1 Schematic diagram of the cross section at point AA';

[0032] Figure 3 Provided for the embodiments of this utility model Figure 2 Enlarged view at point N;

[0033] Figure 4 Provided for the embodiments of this utility model Figure 1 Schematic diagram of the cross section at point BB';

[0034] Figure 5 This is a schematic diagram of the structure of the display device provided in an embodiment of the present utility model.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1-Display panel; 10-Driver substrate; 101-First bonding electrode; 102-Second bonding electrode; 10A-First contact point; 10B-Second contact point; 10C-Third contact point; 10D-Fourth contact point;

[0037] 20 - Light-emitting device group; 21 - Light-emitting device; 211 - First light-emitting device; 212 - Second light-emitting device; 213 - Third light-emitting device; 211A - First light-emitting layer; 212A - Second light-emitting layer; 213A - Third light-emitting layer; 2111 - First connecting electrode; 2112 - Second connecting electrode; 2111A - First functional layer; 2111B - First conductive layer; 2112A - Second functional layer; 2112B - Second conductive layer;

[0038] 30 - Filter layer; 300 - Via; 301 - First via; 302 - Second via; 303 - Third via; 304 - Fourth via; 305 - Fifth via; 306 - Sixth via; 307 - Seventh via; 308 - Eighth via; 309 - Ninth via; 3010 - Tenth via; 3011 - Eleventh via; 31 - First filter layer; 32 - Second filter layer; 33 - Third filter layer; 34 - Fourth filter layer; 35 - Fifth filter layer;

[0039] 40 - Metal filler; 51 - Bottom bonding layer; 52 - First bonding layer; 53 - Second bonding layer; 54 - Third bonding layer; 55 - Fourth bonding layer; 56 - Top bonding layer; α - Angle between the via sidewall and the bottom surface;

[0040] 4-Display device; 41-Middle frame. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower in the actual use or working mode of the device, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only, and features specified as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections or connections that allow for communication; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] The following disclosure provides many different embodiments for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, examples of various specific processes and materials are provided, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0045] This embodiment provides a display panel 1, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown; the display panel 1 includes a driving substrate 10 and a light-emitting device group 20. The driving substrate 10 includes a plurality of first bonding electrodes 101 and a plurality of second bonding electrodes 102. The light-emitting device group 20 is disposed on one side of the driving substrate 10. The light-emitting device group 20 includes a plurality of light-emitting devices 21 stacked together. The light-emitting device 21 includes a first connecting electrode 2111 and a second connecting electrode 2112. The first connecting electrode 2111 is electrically connected to the first bonding electrode 101, and the second connecting electrode 2112 is electrically connected to the second bonding electrode 102.

[0046] The plurality of light-emitting devices 21 include a first light-emitting device 211, a second light-emitting device 212 and a third light-emitting device 213 disposed along the thickness direction of the display panel 1. The second bonding electrode 102 connected to the second light-emitting device 212 and the third light-emitting device 213 has its orthogonal projection on the driving substrate 10 located on different sides of the orthogonal projection of the light-emitting device group 20 on the driving substrate 10.

[0047] Specifically, the first light-emitting device 211 includes a first light-emitting layer 211A, the second light-emitting device 212 includes a second light-emitting layer 212A, and the third light-emitting device 213 includes a third light-emitting layer 213A. The light-emitting colors of the first light-emitting layer 211A, the second light-emitting layer 212A, and the third light-emitting layer 213A are all different.

[0048] It should be noted that currently, light-emitting diodes made of semiconductor materials can be used in color micro-display technology. Typically, at least three monochrome independent screens are used, namely three Micro-LED structures for red, green and blue. The three Micro-LED structures are combined into a color image through an optical mechanism. To achieve full-color display, a mass transfer process is usually used to transfer the red, green and blue Micro-LED chips to a silicon-based driving backplane and precisely correspond them with the pixel driving circuit array, thereby assembling a full-color display panel.

[0049] However, mass transfer technology requires precise alignment and bonding of millions to tens of millions of micro LED chips with driving circuits, resulting in insufficient process stability, low transfer yield, low production efficiency, and high cost. In addition, due to limitations in pixel size, chip boundaries, and alignment accuracy, mass transfer technology cannot achieve ultra-high pixel density and cannot simultaneously meet the stringent performance requirements of applications such as Augmented Reality (AR) and Virtual Reality (VR) for displays, such as high PPI, high brightness, and long lifespan.

[0050] In this embodiment, the light-emitting device group 20 is disposed on one side of the driving substrate 10. The light-emitting device group 20 includes a plurality of light-emitting devices 21 stacked together. Each light-emitting device 21 includes a first connecting electrode 2111 and a second connecting electrode 2112. The first connecting electrode 2111 is electrically connected to the first bonding electrode 101, and the second connecting electrode 2112 is electrically connected to the second bonding electrode 102, thereby forming a display panel 1 with a vertical light-emitting device group 20. This enables the formation of a certain area and uniform brightness of a colored light source within a small volume, effectively reducing the volume of the display panel 1, improving pixel integration, and reducing pixel pitch, thereby meeting the requirements of high PPI and high performance for high-end display applications such as AR / VR.

[0051] Meanwhile, the plurality of light-emitting devices 21 include a first light-emitting device 211, a second light-emitting device 212, and a third light-emitting device 213 arranged along the thickness direction of the display panel 1. The second bonding electrode 102 connected to the second light-emitting device 212 and the third light-emitting device 213 has its orthographic projection on the driving substrate 10 located on different sides of the orthographic projection of the light-emitting device group 20 on the driving substrate 10, thereby realizing independent driving of each light-emitting device 21, avoiding cross interference between connecting electrodes, simplifying wiring paths, and improving display reliability.

[0052] Please continue to combine Figures 1 to 4 In one embodiment, the driving circuit includes a pixel driver for controlling the operation of the light-emitting device 21. The pixel driver can be a thin-film transistor pixel driver or a silicon-based CMOS pixel driver, etc., and is not limited to a specific implementation method, thus possessing good process compatibility and design flexibility.

[0053] Furthermore, in one of the light-emitting device groups 20, the first connection electrodes 2111 of multiple light-emitting devices 21 are all electrically connected to the same first binding electrode 101, and the second connection electrodes 2112 of multiple light-emitting devices 21 are all electrically connected to different second binding electrodes 102, so that each light-emitting device 21 can still be independently driven through different second binding electrodes 102 while sharing the same first binding electrode 101.

[0054] It is understood that in one of the light-emitting device groups 20, the first connecting electrodes 2111 of multiple light-emitting devices 21 are all electrically connected to the same first bonding electrode 101, thereby simplifying the electrode layout of the driving substrate 10, reducing the design of the second connecting electrodes 2112 in related technologies, avoiding too many second connecting electrodes 2112 occupying the light-emitting area of ​​the light-emitting layer in the light-emitting device 21, thereby increasing the light-emitting area of ​​the light-emitting device group 20 and improving the light-emitting efficiency, and achieving higher pixel integration and high PPI while maintaining a compact arrangement.

[0055] Furthermore, by having the second connection electrodes 2112 of multiple light-emitting devices 21 electrically connected to different second binding electrodes 102 in one light-emitting device group 20, the close arrangement of parallel second connection electrodes 2112 on the same side is reduced, electrical interference between different light-emitting devices 21 is avoided, and the operating current of each light-emitting device 21 has an independent circuit and an independent return path, thereby realizing independent driving of each light-emitting device 21.

[0056] Please continue to combine Figures 1 to 4In one embodiment, the driving substrate 10 includes a first contact point 10A, a second contact point 10B, and a third contact point 10C. The first contact point 10A, the second contact point 10B, and the third contact point 10C are respectively configured to correspond to different second bonding electrodes 102, so as to realize independent addressing and driving of different light-emitting devices 21.

[0057] Furthermore, the first connecting electrode 2111 of the first light-emitting device 211 is connected to the first contact point 10A, the first connecting electrode 2111 of the second light-emitting device 212 is connected to the second contact point 10B, and the first connecting electrode 2111 of the third light-emitting device 213 is connected to the third contact point 10C. This avoids current coupling and interference caused by multiple light-emitting devices 21 sharing the same driving port, allowing each light-emitting device 21 to be driven independently through different second binding electrodes 102 while sharing the same first binding electrode 101.

[0058] Please continue to combine Figures 1 to 4 In one embodiment, the display panel 1 includes a light filter layer 30, which is disposed between two adjacent light-emitting devices 21; the light filter layer 30 includes a plurality of vias 300, and the light-emitting devices 21 are connected to the first bonding electrode 101 and the second bonding electrode 102 through the vias 300.

[0059] The angle between the sidewall of the via 300 and the bottom surface of the filter layer 30 near the driving substrate 10 is greater than or equal to 85 degrees and less than or equal to 90 degrees, so that the via 300 maintains a vertical or near-vertical shape, reduces the area occupied by the via 300 on the filter layer 30, leaves more space for the effective light-emitting area, improves the aperture ratio of the pixel, reduces the risk of light being blocked or lost, and thus improves the luminous efficiency and display brightness of the light-emitting device 21.

[0060] Furthermore, the filter layer 30 includes a first filter layer 31 and a second filter layer 32. The first filter layer 31 is disposed between the second connection electrode 2112 of the first light-emitting device 211 and the driving substrate 10. The second filter layer 32 is disposed between the second connection electrode 2112 of the first light-emitting device 211 and the first connection electrode 2111 of the second light-emitting device 212. The orthographic projection of the second filter layer 32 on the driving substrate 10 covers the orthographic projection of the first light-emitting device 211 on the driving substrate 10, in order to avoid optical crosstalk between the first light-emitting device 211 and the second light-emitting device 212.

[0061] The first filter layer 31 includes a first via 301 corresponding to the second contact point 10B, and the second filter layer 32 includes a second via 302 corresponding to the second contact point 10B. The second via 302 is interconnected with the first via 301, and the first connection electrode 2111 of the second light-emitting device 212 can be connected to the second contact point 10B in sequence through the first via 301 and the second via 302, thereby realizing a reliable electrical connection between the second light-emitting device 212 and the driving substrate 10, ensuring the stable operation of the second light-emitting device 212 under independent driving, reducing electrical interference between different light-emitting devices 21, and improving the overall driving accuracy and reliability of the display panel 1.

[0062] Specifically, the display panel 1 further includes a metal filling portion 40, which fills the first via 301 and the second via 302. The first connection electrode 2111 of the second light-emitting device 212 is connected to the second contact point 10B through the metal filling portion 40. The metal filling portion 40 can be made of a metal material that has good contact with the driving substrate 10 and has low resistivity. For example, the material of the metal filling portion 40 includes, but is not limited to, at least one of molybdenum (MO), titanium (Ti), titanium nitride (TiNX), and tungsten (W) or their alloys, thereby reducing contact resistance, improving current transmission efficiency, and reducing local heat generation and power consumption, achieving a high-brightness and low-power display effect.

[0063] Please continue to combine Figures 1 to 4 In one embodiment, the display panel 1 further includes a third filter layer 33 and a fourth filter layer 34. The third filter layer 33 is disposed between the second connection electrode 2112 of the second light-emitting device 212 and the second filter layer 32, and the fourth filter layer 34 is disposed between the first connection electrode 2111 of the third light-emitting device 213 and the third filter layer 33, in order to avoid optical crosstalk between the second light-emitting device 212 and the third light-emitting device 213.

[0064] The third filter layer 33 includes a third via 303 corresponding to the third contact point 10C; the fourth filter layer 34 includes a fourth via 304 corresponding to the third contact point 10C; the second filter layer 32 includes a fifth via 305 corresponding to the third contact point 10C; and the first filter layer 31 includes a sixth via 306 corresponding to the third contact point 10C. The sixth via 306, the fifth via 305, the fourth via 304, and the third via 303 are interconnected. The first connecting electrode 2111 of the third light-emitting device 213 is connected to the third contact point 10C through the fourth via 304, the third via 303, the fifth via 305 and the sixth via 306, thereby realizing the electrical connection between the third light-emitting device 213 and the second bonding electrode 102 of the driving substrate 10, ensuring the stable operation of the third light-emitting device 213 under independent driving, reducing electrical interference between different light-emitting devices 21, and improving the overall driving accuracy and reliability of the display panel 1.

[0065] Furthermore, the metal filling portion 40 fills the fourth via 304, the third via 303, the fifth via 305, and the sixth via 306. The first connecting electrode 2111 of the third light-emitting device 213 is connected to the third contact point 10C through the metal filling portion 40, thereby reducing contact resistance, improving current transmission efficiency, and reducing local heat generation and power consumption, achieving a high-brightness and low-power display effect.

[0066] Please continue to combine Figures 1 to 4 In one embodiment, the driving substrate 10 includes a fourth contact point 10D, which is disposed corresponding to the first bonding electrode 101; the first filter layer 31 includes a seventh via 307 disposed corresponding to the fourth contact point 10D; the second filter layer 32 includes an eighth via 308 corresponding to the second connecting electrode 2112 of the first light-emitting device 211; and the third filter layer 33 includes a ninth via 309 corresponding to the second connecting electrode 2112 of the first light-emitting device 211, wherein the ninth via 309 and the eighth via 308 are interconnected.

[0067] Specifically, the second connection electrode 2112 of the first light-emitting device 211 is connected to the fourth contact point 10D through the seventh via 307, thereby realizing the electrical connection between the first light-emitting device 211 and the first bonding electrode 101 of the driving substrate 10; the first connection electrode 2111 of the second light-emitting device 212 is connected to the second connection electrode 2112 of the first light-emitting device 211 through the eighth via 308 and the ninth via 309, thereby realizing that both the second light-emitting device 212 and the first light-emitting device 211 are electrically connected to the same first bonding electrode 101.

[0068] Furthermore, the display panel 1 also includes a fifth filter layer 35, which is disposed between the second connection electrode 2112 of the third light-emitting device 213 and the fourth filter layer 34; the fourth filter layer 34 includes a tenth via 3010 corresponding to the second connection electrode 2112 of the second light-emitting device 212, and the fifth filter layer 35 includes an eleventh via 3011 corresponding to the second connection electrode 2112 of the second light-emitting device 212, and the eleventh via 3011 and the tenth via 3010 are interconnected.

[0069] The second connection electrode 2112 of the third light-emitting device 213 is connected to the second connection electrode 2112 of the second light-emitting device 212 through the tenth via 3010 and the eleventh via 3011, thereby realizing that the third light-emitting device 213, the second light-emitting device 212 and the first light-emitting device 211 are all electrically connected to the same first bonding electrode 101.

[0070] It is understood that by setting the third light-emitting device 213, the second light-emitting device 212 and the first light-emitting device 211 to be electrically connected to the same first bonding electrode 101, this embodiment can reduce the dependence on the number of first bonding electrodes 101 on the driving substrate 10 while ensuring that each light-emitting device 21 has an independent driving path. This avoids the design of too many first bonding electrodes 101 that would occupy the space of the light-emitting layer, thereby increasing the effective light-emitting area of ​​the light-emitting device group 20, improving the light-emitting efficiency, and simplifying the wiring of the driving substrate 10.

[0071] Please continue to combine Figures 1 to 4 In one embodiment, the second filter layer 32 is used to reflect light with a first wavelength, and the fourth filter layer 34 is used to reflect light with a second wavelength, thereby avoiding optical crosstalk between adjacent light-emitting devices 21.

[0072] Furthermore, the materials of the first filter layer 31, the second filter layer 32, the third filter layer 33, the fourth filter layer 34, and the fifth filter layer 35 are all reflective transparent materials. These reflective transparent materials can both allow some transmitted light to pass through and reflect light of a specific wavelength, thereby achieving optical isolation while maintaining the overall light flux.

[0073] Specifically, the second filter layer 32 and the third filter layer 33 are both used to reflect light with a first wavelength, wherein the light with the first wavelength includes light emitted by the second light-emitting device 212, thereby suppressing the influence of the light emitted by the second light-emitting device 212 on the material of the first light-emitting device 211; the fourth filter layer 34 and the fifth filter layer 35 are both used to reflect light with a second wavelength, wherein the light with the second wavelength includes light emitted by the third light-emitting device 213, thereby suppressing the influence of the light emitted by the third light-emitting device 213 on the material of the second light-emitting device 212.

[0074] It is understood that by setting the first filter layer 31, the second filter layer 32, the third filter layer 33, the fourth filter layer 34, and the fifth filter layer 35 between the light-emitting device groups 20, light of different wavelengths can be selectively reflected in the vertically stacked structure, so that the light emitted by each light-emitting device 21 mainly acts on the corresponding display pixel area, thereby improving the accuracy and stability of color display. At the same time, since the setting of the filter layer 30 does not occupy the horizontal space of the light-emitting device group 20, high pixel density and high PPI display effect can be achieved while maintaining the compact structure of the light-emitting device group 20, further improving the visual uniformity and color purity of the display panel 1, and meeting the requirements of high-end display applications such as AR / VR for miniaturized, high-brightness, and high-precision color display.

[0075] Please continue to combine Figures 1 to 4 In one embodiment, the first connection electrode 2111 includes a first functional layer 2111A and a first conductive layer 2111B, and the second connection electrode 2112 includes a second functional layer 2112A and a second conductive layer 2112B. The first functional layer 2111A is one of a p-type semiconductor layer and an n-type semiconductor layer, and the second functional layer 2112A is the other of a p-type semiconductor layer and an n-type semiconductor layer.

[0076] Furthermore, this embodiment uses the first functional layer 2111A as a p-type semiconductor layer and the second functional layer 2112A as an n-type semiconductor layer as an example to illustrate the technical solution of this utility model; wherein, the materials of the first conductive layer 2111B and the second conductive layer 2112B are both transparent metal materials to ensure light transmittance and reduce the impact on display brightness and color uniformity.

[0077] Specifically, the first conductive layer 2111B of the first light-emitting device 211 is defined as the bottom bonding layer 51. The first light-emitting device 211 is bonded to the driving substrate 10 through the bottom bonding layer 51, thereby ensuring the stable fixation and reliable conductivity of the first light-emitting device 211 in the vertical stacking structure.

[0078] The second conductive layer 2112B and the first filter layer 31 of the first light-emitting device 211 are defined as the first bonding layer 52, and the first conductive layer 2111B and the second filter layer 32 of the second light-emitting device 212 are defined as the second bonding layer 53. The second light-emitting device 212 is bonded to the first light-emitting device 211 through the first bonding layer 52, the second bonding layer 53, and the first light-emitting device 211. The second conductive layer 2112B and the third filter layer 33 of the second light-emitting device 212 are defined as the third bonding layer 54, and the first conductive layer 2111B and the fourth filter layer 34 of the third light-emitting device 213 are defined as the fourth bonding layer 55. The third light-emitting device 213 is bonded to the second light-emitting device 212 through the third bonding layer 54, the fourth bonding layer 55, and the second light-emitting device 212. The second conductive layer 2112B and the fifth filter layer 35 of the third light-emitting device 213 are defined as the top bonding layer 56, thereby forming a multilayer vertical light-emitting device group 20.

[0079] It should be noted that the Micro-LED stacking or mass transfer process in related technologies typically requires precise alignment between each layer of light-emitting devices 21 and the driving substrate 10 and adjacent devices to ensure reliable electrical connections and accurate pixel positions. However, due to the extremely small size of the micro-light-emitting devices 21 (typically at the micrometer level), precise alignment not only increases process complexity but also easily leads to transfer deviations, low yields, and high production costs in large-scale production.

[0080] It is understood that this embodiment uses a conductive layer (including a first conductive layer 2111B and a second conductive layer 2112B) and a filter layer 30 as bonding layers. The conductive layer is made of a transparent metallic material, such as indium tin oxide, indium oxide, zinc oxide, etc. These materials provide good conductivity while allowing light to pass through, thus not hindering the light output of the light-emitting device 21. The filter layer 30 provides electrical insulation and mechanical support, ensuring the structural stability of the light-emitting device 21 during stacking. At the same time, the filter layer 30 also has a filtering function, which can suppress optical crosstalk between different light-emitting devices 21. Through the combination of the conductive layer and the filter layer 30, the bonding layer can tolerate positional deviations within a certain range without affecting the reliability of the electrical connection or the optical output, thereby achieving a stable electrical and mechanical connection between the light-emitting device 21, the driving substrate 10, and adjacent devices without precise alignment.

[0081] Furthermore, operators do not need to perform high-precision alignment of each micro-LED, thereby reducing reliance on precision production equipment and complex operating environments (such as high-precision positioning platforms and low-vibration environments), reducing process difficulty, and improving the feasibility and efficiency of mass production. At the same time, the use of a transparent conductive layer ensures high light transmittance, enabling the entire vertical light-emitting device group 20 to achieve high brightness and uniform color light output in a small space, thereby improving pixel integration, reducing pixel pitch, and meeting the requirements of high PPI and high display performance for high-end display applications such as AR / VR.

[0082] This embodiment also provides a display device 4, please refer to... Figures 1 to 5 The display device 4 includes a display panel 1 and a middle frame 41, which are combined into one unit, and the middle frame 41 is arranged around the outer periphery of the display panel 1.

[0083] It is understood that the display panel 1 has been described in detail in the above embodiments and will not be repeated here; in particular, since the display device 4 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated here.

[0084] In specific applications, the display device 4 can be a display screen for devices such as smartphones, tablets, laptops, smart bracelets, smartwatches, smart glasses, smart helmets, desktop computers, smart TVs, or digital cameras, and can even be applied to electronic devices with flexible displays.

[0085] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0086] The above provides a detailed description of a display panel and display device provided by the embodiments of this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this utility model. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A display panel, characterized in that, include: The driving substrate includes a plurality of first bonding electrodes and a plurality of second bonding electrodes; A light-emitting device group is disposed on one side of the driving substrate. The light-emitting device group includes multiple light-emitting devices. Each light-emitting device includes a first connecting electrode and a second connecting electrode. The first connecting electrode is electrically connected to a first bonding electrode, and the second connecting electrode is electrically connected to a second bonding electrode. The plurality of light-emitting devices include a first light-emitting device, a second light-emitting device, and a third light-emitting device disposed along the thickness direction of the display panel. The orthographic projection of the second bonding electrode connected to the second light-emitting device and the third light-emitting device on the driving substrate is located on different sides of the orthographic projection of the light-emitting device group on the driving substrate.

2. The display panel according to claim 1, characterized in that, In one of the light-emitting device groups, the first connecting electrodes of a plurality of light-emitting devices are all electrically connected to the same first bonding electrode, and the second connecting electrodes of a plurality of light-emitting devices are all electrically connected to different second bonding electrodes.

3. The display panel according to claim 2, characterized in that, The driving substrate includes a first contact point, a second contact point, and a third contact point, wherein the first contact point, the second contact point, and the third contact point are respectively configured for different second bonding electrodes; In this configuration, the first connecting electrode of the first light-emitting device is connected to the first contact point, the first connecting electrode of the second light-emitting device is connected to the second contact point, and the first connecting electrode of the third light-emitting device is connected to the third contact point.

4. The display panel according to claim 3, characterized in that, The display panel further includes a first filter layer and a second filter layer. The first filter layer is disposed between the second connection electrode of the first light-emitting device and the driving substrate, and the second filter layer is disposed between the second connection electrode of the first light-emitting device and the first connection electrode of the second light-emitting device. The first filter layer includes a first via corresponding to the second contact point, the second filter layer includes a second via corresponding to the second contact point, and the first connection electrode of the second light-emitting device is connected to the second contact point through the first via and the second via.

5. The display panel according to claim 4, characterized in that, The display panel further includes a third filter layer and a fourth filter layer. The third filter layer is disposed between the second connecting electrode of the second light-emitting device and the second filter layer, and the fourth filter layer is disposed between the first connecting electrode of the third light-emitting device and the third filter layer. The third filter layer includes a third via corresponding to the third contact point, the fourth filter layer includes a fourth via corresponding to the third contact point, the second filter layer includes a fifth via corresponding to the third contact point, and the first filter layer includes a sixth via corresponding to the third contact point. The first connecting electrode of the third light-emitting device is connected to the third contact point through the fourth via, the third via, the fifth via, and the sixth via.

6. The display panel according to claim 5, characterized in that, The driving substrate includes a fourth contact point, which is disposed corresponding to the first bonding electrode. The first filter layer includes a seventh via corresponding to the fourth contact point, the second filter layer includes an eighth via corresponding to the second connecting electrode of the first light-emitting device, and the third filter layer includes a ninth via corresponding to the second connecting electrode of the first light-emitting device. The second connection electrode of the first light-emitting device is connected to the fourth contact point through the seventh via; the first connection electrode of the second light-emitting device is connected to the second connection electrode of the first light-emitting device through the eighth via and the ninth via.

7. The display panel according to claim 6, characterized in that, The display panel further includes a fifth filter layer, which is disposed between the second connecting electrode of the third light-emitting device and the fourth filter layer; The fourth filter layer includes a tenth via corresponding to the second connection electrode of the second light-emitting device, and the fifth filter layer includes an eleventh via corresponding to the second connection electrode of the second light-emitting device. The second connection electrode of the third light-emitting device is connected to the second connection electrode of the second light-emitting device through the tenth via and the eleventh via.

8. The display panel according to claim 5, characterized in that, The second filter layer is used to reflect light with a first wavelength, and the fourth filter layer is used to reflect light with a second wavelength.

9. The display panel according to any one of claims 1 to 8, characterized in that, The display panel includes a filter layer disposed between two adjacent light-emitting devices; the filter layer includes a plurality of vias, and the light-emitting devices are connected to the first bonding electrode and the second bonding electrode through the vias; The angle between the sidewall of the via and the bottom surface of the filter layer near the driving substrate is greater than or equal to 85 degrees and less than or equal to 90 degrees.

10. A display device, characterized in that, Includes the display panel as described in any one of claims 1-9.

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