Display panel and display device

Abstract

A display panel and a display device. In the display panel, a first light-emitting unit, a second light-emitting unit and a third light-emitting unit in each micro-display unit are vertically stacked along the thickness direction of the display panel; the orthographic projections of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit on a driving substrate overlap to form a projection overlapping area; at least one of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit is electrically connected to the driving substrate by means of an electrical connection structure; the orthographic projection of the electrical connection structure on the driving substrate is located outside the projection overlapping area; and the orthographic projection of the electrical connection structure on the driving substrate is within the orthographic projection of at least one of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit on the driving substrate.

Description

Display panel and display device

[0001] This application claims priority to Chinese Patent Application No. 202411454077.6, filed with the Chinese Patent Office on October 17, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of display technology, such as a display panel and a display device. Background Technology

[0003] Micro-LED chips have the characteristics of high brightness, low power consumption, high contrast and fast response speed, and are widely used in display devices.

[0004] Existing display panels have high resolution requirements, which necessitates smaller Micro-LED chip areas. In this case, the light-emitting area of ​​the light-emitting unit in the Micro-LED chip is even smaller, affecting the display effect.

[0005] Summary of the Invention

[0006] This application provides a display panel and a display device to increase the light-emitting area of ​​the light-emitting unit and improve the display effect while ensuring a high resolution of the display panel.

[0007] According to one aspect of this application, a display panel is provided, comprising: a driving substrate and a plurality of microdisplay units disposed on the driving substrate;

[0008] The microdisplay unit includes a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit that are vertically stacked along the thickness direction of the display panel; the orthographic projections of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit on the driving substrate overlap and form a projection overlap area;

[0009] At least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is electrically connected to the driving substrate through an electrical connection structure; the orthographic projection of the electrical connection structure on the driving substrate is located outside the projection overlap area, and the orthographic projection of the electrical connection structure on the driving substrate is within the orthographic projection of at least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit on the driving substrate.

[0010] According to another aspect of this application, another display panel is provided, including a driving substrate and a micro display unit disposed on the driving substrate. The micro display unit includes a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit that are vertically stacked along the thickness direction of the display panel.

[0011] At least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is electrically connected to the driving substrate through an electrical connection structure;

[0012] The first light-emitting unit, the second light-emitting unit, and the third light-emitting unit form a common projection area on the driving substrate. The common projection area includes the orthographic projection of the first light-emitting unit on the driving substrate, the orthographic projection of the second light-emitting unit on the driving substrate, and the orthographic projection of the third light-emitting unit on the driving substrate. The orthographic projection of the electrical connection structure on the driving substrate is located within the common projection area.

[0013] The electrical connection structure is located on the side of at least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit; the side intersects with the horizontal direction, and the horizontal direction is perpendicular to the thickness direction.

[0014] According to another aspect of this application, another display panel is provided, including a driving substrate and a micro display unit disposed on the driving substrate, wherein the driving substrate is configured to drive the micro display unit to emit light;

[0015] The micro-display unit includes a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit that are vertically stacked along the thickness direction of the display panel; the second light-emitting unit is disposed on the first light-emitting unit, and the third light-emitting unit is disposed on the second light-emitting unit;

[0016] At least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is electrically connected to a contact on the driving substrate through an electrical connection structure located on the side of the light-emitting unit closer to the driving substrate.

[0017] At least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is electrically connected to the common electrode layer of the microdisplay unit through an electrical connection structure located on the side of the light-emitting unit away from the driving substrate; the common electrode layer is located on the side of the third light-emitting unit away from the driving substrate.

[0018] According to another aspect of this application, a display device is provided, including a display panel according to any embodiment of this application.

[0019] The display panel and display device of this application embodiment, by setting the first light-emitting unit, the second light-emitting unit and the third light-emitting unit in the micro-display unit of the display panel to be vertically stacked along the thickness direction of the display panel, the orthographic projections of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit on the driving substrate overlap and form a projection overlap area, at least one of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit is electrically connected to the driving substrate through an electrical connection structure, the orthographic projection of the electrical connection structure on the driving substrate is located outside the projection overlap area, and the orthographic projection of the electrical connection structure on the driving substrate is within the orthographic projection of at least one of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit on the driving substrate, can increase the light-emitting area of ​​the light-emitting unit in the micro-display unit while ensuring the resolution of the display panel, which is beneficial to improving the display effect.

[0020] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 is a top view of a display panel provided in an embodiment of this application;

[0023] Figure 2 is a cross-sectional structural diagram of a micro-display unit provided in an embodiment of this application;

[0024] Figure 3 is a cross-sectional structural diagram of another micro-display unit provided in an embodiment of this application;

[0025] Figure 4 is a top view along the top surface of the first light-emitting unit;

[0026] Figure 5 is a top view along the top surface of the second light-emitting unit;

[0027] Figure 6 is a top view along the top surface of the third light-emitting unit;

[0028] Figure 7 is a schematic diagram of the first overlapping area of ​​the orthogonal projection of the first light-emitting unit and the second light-emitting unit on the driving substrate;

[0029] Figure 8 is a schematic diagram of the second overlapping region of the orthogonal projections of the second and third light-emitting units on the driving substrate;

[0030] Figure 9 is a schematic diagram of the third overlapping region of the orthographic projections of the first light-emitting unit and the third light-emitting unit on the driving substrate;

[0031] Figure 10 is a schematic diagram of the common projection area of ​​the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit;

[0032] Figure 11 is a schematic diagram of another third overlapping region of the first light-emitting unit and the third light-emitting unit projected onto the driving substrate;

[0033] Figure 12 is a schematic diagram of a micro-display unit array in a display panel;

[0034] Figure 13 is a cross-sectional view of another display panel provided in an embodiment of this application;

[0035] Figure 14 is a schematic diagram of another type of micro-display unit array in the display panel;

[0036] Figure 15 is a cross-sectional view along one of the corners after step S1 is completed;

[0037] Figure 16 is a cross-sectional view along the other diagonal after step S1 is completed;

[0038] Figure 17 is a cross-sectional view along one of the corners after step S2 is completed;

[0039] Figure 18 is a cross-sectional view along the other diagonal after step S2 is completed;

[0040] Figure 19 is a cross-sectional view along one of the corners after step S3 is completed;

[0041] Figure 20 is a cross-sectional view along the other diagonal after step S3 is completed;

[0042] Figure 21 is a cross-sectional view along another diagonal of another embodiment after step S3 is completed;

[0043] Figure 22 is a cross-sectional view along one of the corners after step S4 is completed;

[0044] Figure 23 is a cross-sectional view along the other diagonal after step S4 is completed;

[0045] Figure 24 is a cross-sectional view along one of the corners after step S5 is completed;

[0046] Figure 25 is a cross-sectional view along the other diagonal after step S5 is completed;

[0047] Figure 26 is a cross-sectional view along one of the corners after step S6 is completed;

[0048] Figure 27 is a cross-sectional view along the other diagonal after step S6 is completed;

[0049] Figure 28 is a cross-sectional view along another diagonal of another embodiment after step S6 is completed. Detailed Implementation

[0050] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0051] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0052] Figure 1 is a top view of a display panel provided in an embodiment of this application; Figure 2 is a cross-sectional structural diagram of a micro display unit provided in an embodiment of this application; Figure 3 is a cross-sectional structural diagram of another micro display unit provided in an embodiment of this application. Referring to Figures 1-3, the display panel 100 includes a driving substrate 110 and a plurality of micro display units 140 disposed on the driving substrate 110; the micro display unit 140 includes a first light-emitting unit 141, a second light-emitting unit 142 and a third light-emitting unit 143 vertically stacked along the thickness direction y of the display panel; Figure 4 is a top view along the top surface of the first light-emitting unit; Figure 5 is a top view along the top surface of the second light-emitting unit; Figure 6 is a top view along the top surface of the third light-emitting unit. Figure 2 can be obtained by cutting Figure 6 along A1-A2, and Figure 3 can be obtained by cutting Figure 6 along B1-B2. Referring to Figures 1-6, the orthographic projections of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 on the driving substrate 110 overlap, forming an overlapping projection area; at least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 is electrically connected to the driving substrate 110 through an electrical connection structure 14; the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is located outside the overlapping projection area, and the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is within the orthographic projection of at least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 on the driving substrate 110.

[0053] The driving substrate 110 includes a driving circuit. The driving circuit can provide driving signals to the micro-display unit, thereby driving the micro-display unit to emit light.

[0054] The microdisplay unit is disposed on the driving substrate 110 and includes at least two light-emitting units vertically stacked along the thickness direction y of the display panel, such as a first light-emitting unit 141, a second light-emitting unit 142, and a third light-emitting unit 143 stacked together. Optionally, the second light-emitting unit 142 is disposed on the side of the first light-emitting unit 141 away from the driving substrate 110, and the third light-emitting unit 143 is disposed on the side of the second light-emitting unit 142 away from the driving substrate 110. The first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 emit different colors of light, such as red, blue, and green, or red, green, and blue, or blue, red, and green, or green, blue, and red, or green, red, and blue; or at least two of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 emit the same color of light. The first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 each include a first semiconductor layer, a light-emitting layer, and a second semiconductor layer, which are stacked in the thickness direction y of the display panel. The first semiconductor layer is an N-type semiconductor layer, and the second semiconductor layer is a P-type semiconductor layer; or the first semiconductor layer is a P-type semiconductor layer, and the second semiconductor layer is an N-type semiconductor layer. The N-type semiconductor layer may include n-GaN, and the P-type semiconductor layer may include p-GaN. The light-emitting layer may be a quantum well layer, optionally a single quantum well layer or a multi-quantum well layer, such as an InGaN / GaN multi-quantum well layer. The electrical connection structure 14 includes a conductive material; in some alternative embodiments, the material of the electrical connection structure 14 may be a metallic material. Multiple microdisplay units are arranged in an array on the driving substrate 110 to form a microdisplay unit array 130.

[0055] In the micro-display unit, the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 are stacked vertically along the thickness direction y of the display panel. This reduces the planar area occupied by the micro-display unit, thereby reducing its size and improving the resolution of the display panel. Furthermore, the orthographic projections of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 on the driving substrate 110 overlap, forming an overlapping projection area. That is, the orthographic projections of any two of the first light-emitting units 141, the second light-emitting unit 142, and the third light-emitting unit 143 on the driving substrate 110 overlap. This allows for a larger light-emitting area of ​​the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143, increasing their light-emitting area while maintaining the resolution of the display panel.

[0056] Referring again to Figures 1-3, at least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 is electrically connected to the driving substrate 110 via the electrical connection structure 14. In some optional embodiments, at least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 is electrically connected to the driving substrate 110 via the electrical connection structure 14, and at least one of them is electrically connected to the driving substrate 110 via a side lead, wherein one end of the side lead may be electrically connected to the light-emitting unit, and the other end extends from the side of at least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 to the driving substrate 110 and is electrically connected thereto. In other optional embodiments, all three light-emitting units 141, 142, and 143 are electrically connected to the driving substrate 110 via the electrical connection structure 14.

[0057] Figure 7 is a schematic diagram of the first overlapping region of the orthographic projections of the first light-emitting unit and the second light-emitting unit on the driving substrate. Figure 8 is a schematic diagram of the second overlapping region of the orthographic projections of the second light-emitting unit and the third light-emitting unit on the driving substrate. Figure 9 is a schematic diagram of the third overlapping region of the orthographic projections of the first light-emitting unit and the third light-emitting unit on the driving substrate. Referring to Figures 7-9, the projection overlapping region 200 formed by the orthographic projections of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 on the driving substrate 110 is the intersection region of the orthographic projections of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 on the driving substrate 110. Referring to Figure 7, optionally, the orthographic projection of the first light-emitting unit 141 on the driving substrate 110 and the orthographic projection of the second light-emitting unit 142 on the driving substrate 110 overlap to form the first overlapping region 210. Referring to Figure 8, optionally, the orthographic projection of the second light-emitting unit 142 on the driving substrate 110 and the orthographic projection of the third light-emitting unit 143 on the driving substrate 110 overlap to form the second overlapping region 220. Referring to Figure 9, the orthographic projection of the first light-emitting unit 141 on the driving substrate 110 overlaps with the orthographic projection of the third light-emitting unit 143 on the driving substrate 110 to form a third overlapping region 230. As can be seen from Figures 7-9, the projection overlapping region 200 formed by the overlapping orthographic projections of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 on the driving substrate 110 is the same as the third overlapping region 230 shown in Figure 9.

[0058] The orthographic projection of the electrical connection structure 14 on the driving substrate 110 is located outside the projection overlap region 200, and at least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 is within the orthographic projection on the driving substrate 110. Optionally, the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is at least within the orthographic projection of the light-emitting unit connected to the electrical connection structure 14 on the driving substrate 110; the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is at least outside the orthographic projection of at least one light-emitting unit not connected to the electrical connection structure 14 on the driving substrate 110. The light-emitting unit can be the first light-emitting unit 141, the second light-emitting unit 142, or the third light-emitting unit 143. For example, if the first light-emitting unit 141 is electrically connected to the driving substrate 110 through the first electrical connection structure 1412, then the orthographic projection of the first electrical connection structure 1412 on the driving substrate 110 is within the orthographic projection of the first light-emitting unit 141 on the driving substrate 110. If the first electrical connection structure 1412 is not electrically connected to the second light-emitting unit 142 or the third light-emitting unit 143, then the orthographic projection of the first electrical connection structure 1412 on the driving substrate 110 is outside the orthographic projection of at least one of the second light-emitting units 142 and 143 on the driving substrate 110. Specifically, the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is within the orthographic projection of at least one of the first light-emitting units 141, 142, and 143 on the driving substrate 110. That is, the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is located within the common projection area formed by the first light-emitting unit 141, 142, and 143 on the driving substrate 110. Figure 10 is a schematic diagram of the common projection area of ​​the first, second, and third light-emitting units, where the common projection area 300 is the union region of the orthographic projections of the first, second, 142, and 143 on the driving substrate 110.

[0059] By configuring the orthographic projection of the electrical connection structure 14 on the driving substrate 110 to be outside the projection overlap area 200, and ensuring that at least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 is within the orthographic projection on the driving substrate 110, the following can be achieved: Firstly, the electrical connection structure 14 can establish electrical connections between the first light-emitting unit 141, the second light-emitting unit 142, or the third light-emitting unit 143 and the driving substrate 110, without connecting to other light-emitting units, thus guaranteeing the performance of the microdisplay unit. Secondly, it effectively utilizes the spatial structure within the microdisplay unit, allowing each light-emitting unit to have a larger light-emitting area when the planar size of the microdisplay unit is fixed, which is beneficial for improving the display effect.

[0060] In this embodiment, the display panel features a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit in the micro-display unit that are vertically stacked along the thickness direction of the display panel. The orthographic projections of the first, second, and third light-emitting units on the driving substrate overlap, forming an overlapping projection area. At least one of the first, second, and third light-emitting units is electrically connected to the driving substrate via an electrical connection structure. The orthographic projection of the electrical connection structure on the driving substrate is located outside the overlapping projection area, while at least one of the first, second, and third light-emitting units is within the orthographic projection on the driving substrate. This design increases the light-emitting area of ​​the light-emitting units in the micro-display unit while maintaining the resolution of the display panel, thus improving the display effect.

[0061] Referring to Figure 7, the orthographic projection of the first light-emitting unit 141 on the driving substrate 110 and the orthographic projection of the second light-emitting unit 142 on the driving substrate 110 overlap to form a first overlapping region 210, wherein the first overlapping region 210 includes a first central region 211 and a first edge region 212, with the first edge region 212 surrounding the first central region 211. Referring to Figure 8, the orthographic projection of the second light-emitting unit 142 on the driving substrate 110 and the orthographic projection of the third light-emitting unit 143 on the driving substrate 110 overlap to form a second overlapping region 220, wherein the second overlapping region 220 includes a second central region 221 and a second edge region 222, with the second edge region 222 surrounding the second central region 221. Figure 11 is a schematic diagram of another third overlapping region of the orthographic projections of the first light-emitting unit and the third light-emitting unit on the driving substrate. Referring to Figures 9 and 11, the orthographic projection of the first light-emitting unit 141 on the driving substrate 110 overlaps with the orthographic projection of the third light-emitting unit 143 on the driving substrate 110 to form a third overlapping region 230. The third overlapping region 230 includes a third central region 231 and a third edge region 232, with the third edge region 232 surrounding the third central region 231. The projection overlapping region 200 formed by the overlapping orthographic projections of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 on the driving substrate 110 is the same as the third overlapping region 230 shown in Figure 9.

[0062] Referring to Figures 9 and 11, optionally, the projection overlap region includes a central projection overlap region 201 and an edge projection overlap region 202, with the edge projection overlap region 202 surrounding the central projection overlap region 201; the edge projection overlap region 202 has a notch 2021, and the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is located within the notch 2021.

[0063] In this embodiment, the central projection overlapping region 201 of the projection overlapping region 200 overlaps with the third central region 231. In some optional embodiments, the central projection overlapping region 201 of the projection overlapping region 200 overlaps with the first central region 211 and / or the second central region 221. Specifically, the edge projection overlapping region 202 has a gap 2021, which can be formed by the orthographic projection of at least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 onto the driving substrate 110. Correspondingly, at least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 has no corresponding light-emitting unit structure at the position corresponding to the gap 2021. For example, the notch 2021 in the edge projection overlap region 202 is formed by the orthographic projection of the first light-emitting unit 141. That is, the orthographic projection of the first light-emitting unit 141 on the driving substrate 110 has a notch 2021. Therefore, in the thickness direction y of the display panel, the structure of the first light-emitting unit 141 is not included at the corresponding position of the notch 2021, that is, the structural layers (including the first semiconductor layer, the light-emitting layer and the second semiconductor layer) in the first light-emitting unit 141 are not included. By setting the edge projection overlap region 202 to have a notch 2021, the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is located within the notch 2021. On the one hand, this allows the electrical connection structure 14 to be located at a position relative to the edge of the micro-display unit, reducing the impact of the electrical connection structure 14 on the light-emitting effect of the micro-display unit. On the other hand, it ensures that when the electrical connection structure 14 is electrically connected to one of the first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143, it will not form an electrical connection with the other light-emitting units, thus guaranteeing the performance of the micro-display unit.

[0064] Referring again to Figures 9 and 11, optionally, the notch 2021 is projected towards the center, overlapping the region 201 with a recess. The edge of the notch can be an arc shape as shown in Figure 9, or a straight line as shown in Figure 11. The orthographic projection of the electrical connection structure 14 onto the driving substrate 110, or the cross-sectional shape of the electrical connection structure 14, can be circular or rectangular, or other shapes; this embodiment does not specifically limit these shapes.

[0065] As shown in Figures 9 and 11, optionally, the central projection overlap region 201 is rectangular, and the edge projection overlap region 202 extends along each side of the central projection overlap region 201 in a direction away from the central projection overlap region 201.

[0066] Optionally, the orthographic projection of the electrical connection structure 14 onto the drive substrate 110 is located between adjacent edge projection overlapping regions 202, and the notch 2021 is recessed towards the apex of the center projection overlapping region 201.

[0067] The adjacent edge projection overlap region 202 can correspond to two edge projection overlap regions 202 that extend away from the central projection overlap region 201 along the two adjacent sides of the rectangle of the central projection overlap region 201. Accordingly, the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is near the vertex of the central projection overlap region 201, that is, the electrical connection structure 14 is located at the corner of the micro-display unit, which allows the first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143 to all have a large and continuous light-emitting area, ensuring the display effect of the display panel.

[0068] In some optional embodiments, the electrical connection structure 14 is located on the side of at least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143, with the side intersecting the horizontal direction and the horizontal direction perpendicular to the thickness direction y. Here, "the electrical connection structure 14 is located on the side of the light-emitting unit" means that the electrical connection structure 14 is located outside the light-emitting unit (first light-emitting unit 141, second light-emitting unit 142, or third light-emitting unit 143) and is not surrounded by the light-emitting unit. With this configuration, compared to a structure where the electrical connection structure 14 is surrounded by the light-emitting unit, the fabrication of the electrical connection structure 14 can be achieved during the stacking process of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 in the fabrication of the micro-display unit in the display panel, making the fabrication process relatively simple and easy to implement.

[0069] Referring again to Figures 1-11, optionally, the second light-emitting unit 142 is located between the first light-emitting unit and the third light-emitting unit 143, and the second light-emitting unit 142 is located on the side of the first light-emitting unit 141 away from the driving substrate 110; the driving substrate 110 is provided with a first contact 111, a second contact 112, and a third contact 113; the first semiconductor layer of the first light-emitting unit 141 is electrically connected to the first contact 111; the electrical connection structure 14 includes a first electrical connection structure 1412, a second electrical connection structure 1421, a third electrical connection structure 1422, and a fourth electrical connection structure 1431; the second semiconductor layer of the first light-emitting unit 141 is electrically connected to the common electrode layer 143B through the first electrical connection structure 1412, the first semiconductor layer of the second light-emitting unit 142 is electrically connected to the second contact 112 through the second electrical connection structure 1421, the second semiconductor layer of the second light-emitting unit 142 is electrically connected to the common electrode layer 143B through the third electrical connection structure 1422, and the first semiconductor layer of the third light-emitting unit 143 is electrically connected to the common electrode layer 143B. The conductor layer is electrically connected to the third contact 113 via the fourth electrical connection structure 1431; the orthographic projection of the first electrical connection structure 1412 on the driving substrate 110 is located within the orthographic projection of the first light-emitting unit 141 on the driving substrate 110; the orthographic projection of the second electrical connection structure 1421 on the driving substrate 110 is located within the orthographic projection of the second light-emitting unit 142 on the driving substrate 110, and within the orthographic projection of the third light-emitting unit 143 on the driving substrate 110; the orthographic projection of the third electrical connection structure 1422 on the driving substrate 110 is located within the orthographic projection of the second light-emitting unit 142 on the driving substrate 110, and within the orthographic projection of the first light-emitting unit 141 on the driving substrate 110; the orthographic projection of the fourth electrical connection structure 1431 on the driving substrate 110 is located within the orthographic projection of the third light-emitting unit 143 on the driving substrate 110; the common electrode layer 143B is located on the side of the third light-emitting unit 143 away from the driving substrate 110, and is electrically connected to the second semiconductor layer of the third light-emitting unit 143.

[0070] In this embodiment, the first semiconductor layer of the first light-emitting unit 141 is directly or indirectly electrically connected to the first contact 111 on the driving substrate 110. Direct electrical connection between the first semiconductor layer of the first light-emitting unit 141 and the first contact 111 on the driving substrate 110 can mean that the first semiconductor layer of the first light-emitting unit 141 is in direct contact with the first contact 111. Indirect electrical connection between the first semiconductor layer of the first light-emitting unit 141 and the first contact 111 can mean that the first semiconductor layer of the first light-emitting unit 141 is electrically connected to the first contact 111 through other conductive structures. Optionally, the display panel further includes a first bottom conductive layer 141A corresponding to each microdisplay unit; the first semiconductor layer of the first light-emitting unit 141 is electrically connected to the first contact 111 through the first bottom conductive layer 141A. In some optional embodiments, the first bottom conductive layer 141A includes a first metal layer, that is, the material of the first bottom conductive layer 141A can be a metallic material. The first bottom conductive layer 141A can serve to spread and / or reflect current.

[0071] In the microdisplay unit, the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 can be either a common cathode structure or a common anode structure. In the common cathode structure, the common electrode layer 143B serves as the common cathode. In this case, the anodes of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 are independent of each other, and the first contact 111, the second contact 112, and the third contact 113 can be connected to the anodes of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143, respectively. In the common anode structure, the common electrode layer 143B serves as the common anode. In this case, the cathodes of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 are independent of each other, and the first contact 111, the second contact 112, and the third contact 113 can be connected to the cathodes of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143, respectively.

[0072] Referring to Figures 2 and 3, optionally, the microdisplay unit further includes a first top conductive layer 141B, a second bottom conductive layer 142A, a second top conductive layer 142B, and a third bottom conductive layer 143A. The first top conductive layer 141B is disposed on the side of the first light-emitting unit 141 near the second light-emitting unit 142; the second bottom conductive layer 142A is disposed on the side of the second light-emitting unit 142 near the first light-emitting unit 141; the second top conductive layer 142B is disposed on the side of the second light-emitting unit 142 near the third light-emitting unit 143; and the third bottom conductive layer 143A is disposed on the side of the third light-emitting unit 143 near the second light-emitting unit 142. The materials of the first top conductive layer 141B, the second bottom conductive layer 142A, the second top conductive layer 142B, and the third bottom conductive layer 143A can be transparent conductive materials.

[0073] Optionally, the microdisplay unit further includes a first insulating layer 144, a second insulating layer 145, a third insulating layer 146, and a fourth insulating layer 147. The first insulating layer 144 is located between the first light-emitting unit 141 and the second light-emitting unit 142; the second insulating layer 145 is disposed on the side of the second light-emitting unit 142; the third insulating layer 146 is disposed between the second light-emitting unit 142 and the third light-emitting unit 143; and the fourth insulating layer 147 is disposed on the side of the third light-emitting unit 143.

[0074] Optionally, the electrical connection structure is an electrode post, with the first electrical connection structure 1412, the second electrical connection structure 1421, the third electrical connection structure 1422, and the fourth electrical connection structure 1431 being the first electrode post, the second electrode post, the third electrode post, and the fourth electrode post, respectively. Taking the case where the microdisplay unit has a common cathode structure as an example, the first electrode post and the third electrode post are respectively connected to the common electrode layer 143B, serving as cathode posts; the second electrode post serves as the anode post of the second light-emitting unit 142, and the fourth electrode post serves as the anode post of the third light-emitting unit 143.

[0075] Referring to Figure 1, optionally, multiple micro-display units form a micro-display unit array, and the driving substrate 110 also includes a peripheral common electrode 120, which at least partially surrounds the micro-display unit array and is electrically connected to the common electrode layer 143B.

[0076] In some alternative embodiments, the peripheral common electrode 120 may be integrally formed with the common electrode layer 143B, and the peripheral common electrode 120 and the common electrode layer 143B may be made of the same material. In other alternative embodiments, the peripheral common electrode 120 and the common electrode layer 143B may also be formed stepwise, in which case the material of the peripheral common electrode 120 and the common electrode layer 143B may be the same or different.

[0077] In this embodiment, the peripheral common electrode 120 at least partially surrounds the microdisplay unit array. In some optional embodiments, the peripheral common electrode can be a ring structure, and the microdisplay unit array can be disposed within the ring structure. This allows the peripheral common electrode to transmit electrical signals to the common electrode of the microdisplay unit array from multiple directions, which is beneficial to improving the display uniformity of the display panel.

[0078] Figure 12 is a schematic diagram of a micro-display unit array in a display panel. Referring to Figures 9 and 12, the central projection overlap area 201 of the projection overlap area 200 is rectangular, and the first electrical connection structure 1412, the second electrical connection structure 1421, the third electrical connection structure 1422, and the fourth electrical connection structure 1431 are located at the four vertices of the rectangle. This allows the electrical connection structures 14 to be evenly distributed at the vertices of the central projection overlap area 201, making more effective use of the space within the micro-display unit. This allows the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 to have a larger light-emitting area, given a fixed planar area occupied by the micro-display unit. Furthermore, the presence of electrical connection structures 14 at all four vertices of the rectangle makes the light emission effect of the edge areas of the micro-display unit more uniformly affected by the electrical connection structures 14, thus ensuring uniform light emission. In addition, the first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143 each have corresponding electrical connection structures 14, which helps to reduce the difference in the light-emitting effect of the first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143, and is conducive to improving the display effect.

[0079] In some optional embodiments of this application, the first electrical connection structure 1412, the third electrical connection structure 1422, and the common electrode layer 143B are integrally formed. This reduces the number of process steps in the display panel and simplifies the manufacturing process.

[0080] Figure 13 is a cross-sectional view of another display panel provided in an embodiment of this application. Figure 13 can be obtained by cutting along B1-B2 corresponding to Figure 6. Optionally, the second electrical connection structure 1421 is electrically connected to the second light-emitting unit 142 through a second metal layer 1421A located on the side of the second electrical connection structure 1421 away from the driving substrate 110; and / or the fourth electrical connection structure 1431 is electrically connected to the third light-emitting unit 143 through a third metal layer 1431A located on the side of the fourth electrical connection structure 1431 away from the driving substrate 110.

[0081] Specifically, the second metal layer 1421A serves two purposes. First, it acts as a bonding layer between the second electrical connection structure 1421 and the second light-emitting unit 142, enabling them to be electrically connected via metal bonding and ensuring the reliability of the connection between them. Second, the second metal layer 1421A reflects the light emitted by the second light-emitting unit 142 and the third light-emitting unit 143, thereby increasing the light output of both units.

[0082] The third metal layer 1431A serves two purposes. First, it acts as a bonding layer between the fourth electrical connection structure 1431 and the third light-emitting unit 143, enabling them to be electrically connected via metal bonding and ensuring the reliability of their connection. Second, the third metal layer 1431A can reflect the light emitted by the third light-emitting unit 143, thereby increasing the light output of the third light-emitting unit 143.

[0083] In some optional embodiments of this application, the cross-sectional area of ​​the second metal layer 1421A is greater than the cross-sectional area of ​​the second electrical connection structure 1421, and less than or equal to the area of ​​the second light-emitting unit extending above the second electrical connection structure 1421 beyond the first light-emitting unit 141; and / or, the cross-sectional area of ​​the third metal layer 1431A is greater than the cross-sectional area of ​​the fourth electrical connection structure 1431, and less than or equal to the area of ​​the third light-emitting unit 143 extending above the fourth electrical connection structure 1431 beyond the second light-emitting unit 142; the cross-sectional area is the cross-sectional area of ​​the section in the horizontal direction, and the horizontal direction is perpendicular to the thickness direction y.

[0084] Setting the cross-sectional area of ​​the second metal layer 1421A to be greater than the cross-sectional area of ​​the second electrical connection structure 1421 and less than or equal to the area of ​​the second light-emitting unit 142 extending above the first light-emitting unit 141 above the second electrical connection structure 1421 can make full use of the area above the second electrical connection structure 1421 (the area of ​​the second electrical connection structure 1421 away from the driving substrate 110), so that the cross-sectional area of ​​the second metal layer 1421A is larger, thereby better reflecting the light emitted by the second light-emitting unit 142 and the third light-emitting unit 143, while avoiding blocking the light emitted by the first light-emitting unit 141 and ensuring the light output of the first light-emitting unit 141.

[0085] Setting the cross-sectional area of ​​the third metal layer 1431A to be larger than the cross-sectional area of ​​the fourth electrical connection structure 1431 and less than or equal to the area of ​​the third light-emitting unit 143 extending above the fourth electrical connection structure 1431 and beyond the second light-emitting unit 142 can make full use of the area above the fourth electrical connection structure 1431, resulting in a larger cross-sectional area of ​​the third metal layer 1431A, which better reflects the light emitted by the third light-emitting unit 143, while avoiding blocking the light emitted by the first light-emitting unit 141 and the second light-emitting unit 142, thus ensuring the light output of the first light-emitting unit 141 and the second light-emitting unit 142.

[0086] Figure 14 is a schematic diagram of another microdisplay unit array in a display panel. Referring to Figure 14, optionally, in two microdisplay units arranged along the diagonal direction of the microdisplay unit array or the diagonal direction of the microdisplay units, the first electrical connection structure 1412 of one microdisplay unit and the third electrical connection structure 1422 of the other microdisplay unit are integrally formed. This arrangement allows the first electrical connection structure 1412 of one microdisplay unit and the third electrical connection structure 1422 of the other microdisplay unit to be formed simultaneously during fabrication, simplifying the fabrication process. As shown in Figure 14, optionally, the orthographic projection of the microdisplay unit on the driving substrate is rectangular, and the diagonal direction of the microdisplay unit is the direction of the line connecting the two diagonal vertices of the rectangular microdisplay unit. Optionally, the orthographic projection of the microdisplay unit array on the driving substrate is rectangular, and the diagonal direction of the microdisplay unit array is the direction of the line connecting the two diagonal vertices of the rectangular microdisplay unit array. In some optional embodiments, the diagonal direction of the microdisplay unit array is the same as the diagonal direction of the microdisplay unit.

[0087] Referring again to Figure 14, optionally, the first electrical connection structure 1412 includes a first base 1412A and a first extension 1412B, the first extension 1412B being located on the side of the first base 1412A near another micro-display unit arranged along the diagonal direction of the micro-display unit array or the diagonal direction of the micro-display units; the third electrical connection structure 1422 includes a second base 1422A and a second extension 1422B, the second extension 1422B being located on the side of the second base 1422A near another micro-display unit arranged along the diagonal direction of the micro-display unit array or the diagonal direction of the micro-display units; in the two micro-display units arranged along the diagonal direction of the micro-display unit array or the diagonal direction of the micro-display units, the first base 1412A of one micro-display unit and the second base 1422A of the other micro-display unit are electrically connected through the first extension 1412B and the second extension 1422B.

[0088] This application embodiment also provides another display panel. Referring to Figures 1-14, the display panel 100 includes a driving substrate 110 and micro display units 140 disposed on the driving substrate 110. The micro display unit 140 includes a first light-emitting unit 141, a second light-emitting unit 142, and a third light-emitting unit 143 vertically stacked along the thickness direction y of the display panel. At least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 is electrically connected to the driving substrate 110 through an electrical connection structure 14. The first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 are... The element 143 forms a common projection area on the driving substrate 110. The common projection area includes the orthographic projection of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 on the driving substrate 110. The orthographic projection of the electrical connection structure 14 on the driving substrate 110 is located within the common projection area of ​​14. The electrical connection structure 14 is located on the side of at least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143. The side intersects the horizontal direction, and the horizontal direction is perpendicular to the thickness direction y.

[0089] The display panel of this embodiment effectively utilizes the spatial structure within the micro-display unit, allowing each light-emitting unit to have a larger light-emitting area when the planar size of the micro-display unit is fixed, which is beneficial to improving the display effect. Furthermore, by setting the electrical connection structure on the side of at least one of the first, second, and third light-emitting units, the electrical connection structure can be fabricated during the fabrication process of the micro-display unit of the display panel. Compared to a display panel structure where the electrical connection structure is surrounded by the light-emitting units or where the electrical connection structure is located on the side of the light-emitting units, the fabrication process is relatively simple and easy to implement.

[0090] This application embodiment also provides another display panel. Referring to Figures 1-14, the display panel includes a driving substrate 110 and micro display units 140 disposed on the driving substrate 110. The driving substrate 110 is configured to drive the micro display units 140 to emit light. The micro display unit 140 includes a first light-emitting unit 141, a second light-emitting unit 142, and a third light-emitting unit 143 vertically stacked along the thickness direction y of the display panel. The second light-emitting unit 142 is disposed on the first light-emitting unit 141, and the third light-emitting unit 143 is disposed on the second light-emitting unit 142. The first light-emitting unit... At least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 is electrically connected to a contact on the driving substrate 110 through an electrical connection structure located on the side of the light-emitting unit closer to the driving substrate 110; at least one of the first light-emitting unit 141, the second light-emitting unit 142, and the third light-emitting unit 143 is electrically connected to the common electrode layer 143B of the micro-display unit through an electrical connection structure located on the side of the light-emitting unit away from the driving substrate 110; the common electrode layer 143B is located on the side of the third light-emitting unit 143 away from the driving substrate 110.

[0091] The display panel of this embodiment effectively utilizes the spatial structure within the micro-display unit, so that when the planar size of the micro-display unit is fixed, each light-emitting unit can have a larger light-emitting area, which is beneficial to improving the display effect.

[0092] Referring to Figures 2 and 3, in some optional embodiments of this application, the electrical connection structure includes a first electrical connection structure 1412, a second electrical connection structure 1421, a third electrical connection structure 1422, and a fourth electrical connection structure 1431.

[0093] The first semiconductor layer and the second semiconductor layer of the first light-emitting unit 141 are electrically connected to the first contact 111 and the common electrode layer 143B on the driving substrate 110 through the first bottom conductive layer 141A located on the side of the first light-emitting unit 141 close to the driving substrate 110 and the first electrical connection structure 1412 located on the side of the first light-emitting unit 141 away from the driving substrate 110, respectively.

[0094] The first semiconductor layer and the second semiconductor layer of the second light-emitting unit 142 are respectively electrically connected to the second contact 112 and the common electrode layer on the driving substrate 110 through the second electrical connection structure 1421 located on the side of the second light-emitting unit 142 close to the driving substrate 110 and the third electrical connection structure 1422 located on the side of the second light-emitting unit 142 away from the driving substrate 110.

[0095] The first semiconductor layer of the third light-emitting unit 143 is electrically connected to the third contact 113 on the driving substrate 110 through the fourth electrical connection structure 1431 located on the side of the third light-emitting unit 143 near the driving substrate 110. The common electrode layer 143B is disposed on the second semiconductor layer of the third light-emitting unit 143 and electrically connected to the second semiconductor layer.

[0096] Referring again to Figures 2 and 3, optionally, the second electrical connection structure 1421 is located on the side of the first light-emitting unit 141 and outside the first light-emitting unit 141, the first electrical connection structure 1412 and the fourth electrical connection structure 1431 are respectively located on the side of the second light-emitting unit 142 and outside the second light-emitting unit 142, and the third electrical connection structure 1422 is located on the side of the third light-emitting unit 143 and outside the third light-emitting unit 143.

[0097] The following describes the manufacturing process of the display panel, which is applicable to the display panels of any of the above embodiments of this application.

[0098] The manufacturing process of the display panel may include the following steps S1-S7.

[0099] Figures 15 and 16 are schematic diagrams of the structure after step S1 is completed. Figure 15 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 2 during the fabrication process, and Figure 16 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 3 or Figure 13 during the fabrication process. As shown in Figures 15 and 16, S1 includes: attaching the first light-emitting unit 141 to the driving substrate 110; electrically connecting the first semiconductor layer of the first light-emitting unit 141 to the first contact 111 on the driving substrate 110 through the first bottom conductive layer 141A; and then providing a first top conductive layer 141B on the top surface of the first light-emitting unit 141 (in some embodiments, the first top conductive layer 141B may be omitted).

[0100] Figures 17 and 18 are schematic diagrams of the structure after step S2 is completed. Figure 17 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 2 during the fabrication process, and Figure 18 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 3 or Figure 13 during the fabrication process. As shown in Figures 17 and 18, S2 includes: forming a first insulating layer 144 on the surface of the first light-emitting unit 141 after step S1; then etching the first insulating layer 144 along the vertical direction corresponding to the second contact 112 on the driving substrate 100 to form a second electrical connection structure 1421; the end of the second electrical connection structure 1421 facing the driving substrate 110 is electrically connected to the second contact 112 on the driving substrate 110.

[0101] Figures 19, 20, and 21 are schematic diagrams of the structure after step S3 is completed. Figure 19 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 2 during the fabrication process; Figure 20 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 3 during the fabrication process; and Figure 21 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 13 during the fabrication process. As shown in Figures 19-21, S3 includes: forming a second bottom conductive layer 142A on the first insulating layer 144; the second bottom conductive layer 142A is electrically connected to the end of the second electrical connection structure 1421 facing away from the driving substrate 110; and then the second light-emitting unit 142 is disposed on the second bottom conductive layer 142A. In other embodiments, the second bottom conductive layer 142A may not be formed. In other embodiments, the second bottom conductive layer 142A may be disposed first on the side of the second light-emitting unit 142 facing the driving substrate 110, and then the second light-emitting unit 142 with the second bottom conductive layer 142A may be disposed on the first insulating layer 144. As shown in Figure 21, before forming the second bottom conductive layer 142A on the first insulating layer 144, a second metal layer 1421A may be formed on the first insulating layer 144. The side of the second metal layer 1421A facing the driving substrate 110 is electrically connected to the end of the second electrical connection structure 1421 away from the driving substrate 110. In other embodiments, the second metal layer 1421A may be formed first at the corresponding position on the side of the second light-emitting unit 142 facing the driving substrate 110. The second metal layer 1421A is directly (without the second bottom conductive layer 142A) formed on the driving substrate 110. The second light-emitting unit 142 is electrically connected to the second electrical connection structure 1421 at the end away from the driving substrate 100, either by a surface conductive layer 142A or indirectly (with a second bottom conductive layer 142A). In other embodiments, the second bottom conductive layer 142A may be first provided on the side of the second light-emitting unit 142 facing the driving substrate 110, and then the second metal layer 1421A may be provided on the second bottom conductive layer 142A. The second light-emitting unit 142 with the second bottom conductive layer 142A and the second metal layer 1421A may be provided on the first insulating layer 144.

[0102] Figures 22 and 23 are schematic diagrams of the structure after step S4 is completed. Figure 22 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 2 during the fabrication process, and Figure 23 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 3 or Figure 13 during the fabrication process. As shown in Figures 22 and 23, S4 includes: forming a second insulating layer 145 around the second light-emitting unit 142, such that the top surface of the second insulating layer 145 is on the same plane as the top surface of the second light-emitting unit 142; and then forming a second top surface conductive layer 142B on the top surface of the second light-emitting unit 142 (in some embodiments, the second top surface conductive layer 142B may not be formed).

[0103] Figures 24 and 25 are schematic diagrams of the structure after step S5 is completed. Figure 24 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 2 during the fabrication process, and Figure 25 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 3 or Figure 13 during the fabrication process. As shown in Figures 24 and 25, S5 includes: forming a third insulating layer 146 on the surface of the light-emitting unit after step S4; etching the third insulating layer 146 along the vertical direction corresponding to the second contact 112 on the driving substrate 100 to form a fourth electrical connection structure 1431; and electrically connecting the end of the fourth electrical connection structure 1431 facing the driving substrate 110 to the second contact 112 on the driving substrate 110.

[0104] Figures 26, 27, and 28 are schematic diagrams of the structure after step S6 is completed. Figure 26 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 2 during the fabrication process; Figure 27 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 3 during the fabrication process; and Figure 28 corresponds to the intermediate structure of the cross-sectional view of the display panel shown in Figure 13 during the fabrication process. As shown in Figures 26-28, S6 includes: forming a third bottom conductive layer 143A; the third bottom conductive layer 143A is electrically connected to the end of the fourth electrical connection structure 1431 opposite to the driving substrate 110; a third light-emitting unit 143 is disposed on the third bottom conductive layer 143A (in some embodiments, the third bottom conductive layer 143A may not be formed); and the first semiconductor layer of the third light-emitting unit 143 is electrically connected to the third bottom conductive layer 143A. As shown in Figure 28, before forming the third bottom conductive layer 143A, a third metal layer 1431A may be formed. The side of the third metal layer 1431A facing the driving substrate 110 is electrically connected to the end of the fourth electrical connection structure 1431 away from the driving substrate 110. In other embodiments, the third metal layer 1431A may be formed at the corresponding position on the side of the third light-emitting unit 143 facing the driving substrate 110. The third metal layer 1431A is directly (without the third bottom conductive layer 143A) or indirectly (with the third bottom conductive layer 143A) electrically connected to the end of the fourth electrical connection structure 1431 away from the driving substrate 100. In other embodiments, the third bottom conductive layer 143A may be first disposed on the side of the third light-emitting unit 143 facing the driving substrate 110, and then the third metal layer 1431A may be disposed on the third bottom conductive layer 143A. The third light-emitting unit 143 with the third bottom conductive layer 143A and the third metal layer 1431A may be disposed on the third insulating layer 146.

[0105] Figures 2 and 3 can be schematic diagrams of the structure after step S7 is completed. Referring to Figures 2 and 3, S7 includes: forming a fourth insulating layer 147 around the third light-emitting unit 143, such that the top surface of the fourth insulating layer 147 is on the same plane as the top surface of the three light-emitting units 143; etching to form a first electrical connection structure 1412 and a third electrical connection structure 1422, the first electrical connection structure 1412 and the third electrical connection structure 1422 being electrically connected to the first light-emitting unit 141 and the second light-emitting unit 142 respectively at the end facing the driving substrate 110; then forming a common electrode layer 143B on the top surface of the third light-emitting unit 143, the common electrode layer 143B being electrically connected to the end of the first electrical connection structure 1412 and the third electrical connection structure 1422 away from the driving substrate 110; and the common electrode layer 143B being electrically connected to the third light-emitting unit 143 at the same time (in some embodiments, the first electrical connection structure 1412, the third electrical connection structure 1422, and the common electrode layer 143B may also be formed integrally).

[0106] This application also provides a display device, which includes the display panel of any of the above embodiments of this application and has the beneficial effects of the display panel of any of the above embodiments, which will not be described again here.

[0107] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this application can be achieved, and this is not limited herein.

[0108] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A display panel, comprising: A driving substrate and a plurality of micro-display units disposed on the driving substrate; The micro-display unit includes a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit that are vertically stacked along the thickness direction of the display panel; the orthographic projections of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit on the driving substrate overlap and form a projection overlap area; At least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is electrically connected to the driving substrate via an electrical connection structure; The orthographic projection of the electrical connection structure on the driving substrate is located outside the overlapping projection area, and the orthographic projection of the electrical connection structure on the driving substrate is within the orthographic projection of at least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit on the driving substrate.

2. The display panel of claim 1, wherein, The projection overlap region includes a central projection overlap region and an edge projection overlap region, wherein the edge projection overlap region surrounds the central projection overlap region; There is a gap in the overlapping area of ​​the edge projections, and the orthographic projection of the electrical connection structure on the driving substrate is located within the gap.

3. The display panel of claim 2, wherein, The notch is recessed in the area where it overlaps with the center projection.

4. The display panel of claim 2, wherein, The central projection overlap region is rectangular, and the edge projection overlap region extends along each side of the central projection overlap region in a direction away from the central projection overlap region.

5. The display panel of claim 4, wherein, The electrical connection structure is located between adjacent overlapping edge projection regions in the orthographic projection of the driving substrate, and the notch is recessed towards the apex of the overlapping center projection region.

6. The display panel of claim 1, wherein, The electrical connection structure is located on the side of at least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit. The side intersects with the horizontal direction, and the horizontal direction is perpendicular to the thickness direction.

7. The display panel according to any one of claims 1-6, wherein, The second light-emitting unit is located between the first light-emitting unit and the third light-emitting unit, and the second light-emitting unit is located on the side of the first light-emitting unit away from the driving substrate; the driving substrate is provided with a first contact, a second contact and a third contact; the first semiconductor layer of the first light-emitting unit is electrically connected to the first contact; The electrical connection structure includes a first electrical connection structure, a second electrical connection structure, a third electrical connection structure, and a fourth electrical connection structure; the second semiconductor layer of the first light-emitting unit is electrically connected to the common electrode layer through the first electrical connection structure, and the first semiconductor layer of the second light-emitting unit is electrically connected to the common electrode layer through the second electrical connection structure. The structure is electrically connected to the second contact, the second semiconductor layer of the second light-emitting unit is electrically connected to the common electrode layer through the third electrical connection structure, and the first semiconductor layer of the third light-emitting unit is electrically connected to the third contact through the fourth electrical connection structure; the orthographic projection of the first electrical connection structure on the driving substrate is located within the orthographic projection of the first light-emitting unit on the driving substrate; the orthographic projection of the second electrical connection structure on the driving substrate is within the orthographic projection of the second light-emitting unit on the driving substrate, and also within the orthographic projection of the third light-emitting unit on the driving substrate; The orthographic projection of the third electrical connection structure on the driving substrate is within the orthographic projection of the second light-emitting unit on the driving substrate, and also within the orthographic projection of the first light-emitting unit on the driving substrate; The orthographic projection of the fourth electrical connection structure on the driving substrate is located within the orthographic projection of the third light-emitting unit on the driving substrate; The common electrode layer is located on the side of the third light-emitting unit away from the driving substrate and is electrically connected to the second semiconductor layer of the third light-emitting unit.

8. The display panel of claim 7, wherein, Multiple microdisplay units form an array within the microdisplay unit array. The driving substrate also includes a peripheral common electrode, which at least partially surrounds the microdisplay unit array and is electrically connected to the common electrode layer.

9. The display panel according to claim 7 further includes a first bottom conductive layer corresponding to each of the micro-display units; The first semiconductor layer of the first light-emitting unit is electrically connected to the first contact through the first bottom conductive layer.

10. The display panel of claim 9, wherein, The first bottom conductive layer includes a first metal layer.

11. The display panel of claim 7, wherein, The central projection overlap area of ​​the projection overlap area is a rectangle, and the first electrical connection structure, the second electrical connection structure, the third electrical connection structure and the fourth electrical connection structure are respectively located at the four vertices of the rectangle.

12. The display panel of claim 7, wherein, The electrical connection structure is an electrode post, and the first electrical connection structure, the second electrical connection structure, the third electrical connection structure, and the fourth electrical connection structure are respectively the first electrode post, the second electrode post, the third electrode post, and the fourth electrode post.

13. The display panel of claim 7, wherein, The first electrical connection structure, the third electrical connection structure, and the common electrode layer are integrally formed.

14. The display panel of claim 7, wherein, The second electrical connection structure is electrically connected to the second light-emitting unit via a second metal layer located on the side of the second electrical connection structure away from the driving substrate; and / or The fourth electrical connection structure is located on the side of the fourth electrical connection structure away from the driving substrate. The third metal layer is electrically connected to the third light-emitting unit.

15. The display panel of claim 14, wherein, The cross-sectional area of ​​the second metal layer is greater than the cross-sectional area of ​​the second electrical connection structure, and less than or equal to the area of ​​the second light-emitting unit extending beyond the first light-emitting unit above the second electrical connection structure; And / or, The cross-sectional area of ​​the third metal layer is greater than the cross-sectional area of ​​the fourth electrical connection structure, and less than or equal to the area of ​​the third light-emitting unit extending above the fourth electrical connection structure beyond the second light-emitting unit; The cross-sectional area is the cross-sectional area of ​​the section in the horizontal direction, and the horizontal direction is perpendicular to the thickness direction.

16. The display panel of claim 7, wherein, In two micro-display units arranged diagonally along the micro-display unit array or diagonally along the micro-display unit array, the first electrical connection structure of one micro-display unit and the third electrical connection structure of the other micro-display unit are integrally formed.

17. The display panel of claim 16, wherein, The first electrical connection structure includes a first base and a first extension, the first extension being located on the side of the first base near another micro-display unit arranged along the diagonal direction of the micro-display unit array or the diagonal direction of the micro-display units; the third electrical connection structure includes a second base and a second extension, the second extension being located on the side of the second base near another micro-display unit arranged along the diagonal direction of the micro-display unit array or the diagonal direction of the micro-display units. The first base and the second base of two micro-display units arranged diagonally along the micro-display unit array or diagonally along the micro-display unit array are electrically connected through the first extension and the second extension.

18. A display panel, comprising a driving substrate and a microdisplay unit disposed on the driving substrate, the microdisplay unit comprising a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit vertically stacked along the thickness direction of the display panel; At least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is electrically connected to the driving substrate through an electrical connection structure; The first light-emitting unit, the second light-emitting unit, and the third light-emitting unit form a common projection area on the driving substrate. The common projection area includes the orthographic projection of the first light-emitting unit on the driving substrate, the orthographic projection of the second light-emitting unit on the driving substrate, and the orthographic projection of the third light-emitting unit on the driving substrate. The orthographic projection of the electrical connection structure on the driving substrate is located within the common projection area. The electrical connection structure is located between the first light-emitting unit, the second light-emitting unit, the third light-emitting unit, and so on. One of the sides is missing; the side intersects the horizontal direction, and the horizontal direction is perpendicular to the thickness direction.

19. A display panel, comprising a driving substrate and a microdisplay unit disposed on the driving substrate, wherein the driving substrate is configured to drive the microdisplay unit to emit light; The micro-display unit includes a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit that are vertically stacked along the thickness direction of the display panel; the second light-emitting unit is disposed on the first light-emitting unit, and the third light-emitting unit is disposed on the second light-emitting unit. At least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is electrically connected to a contact on the driving substrate through an electrical connection structure located on the side of the light-emitting unit closer to the driving substrate; At least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is electrically connected to the common electrode layer of the microdisplay unit through an electrical connection structure located on the side of the light-emitting unit away from the driving substrate; the common electrode layer is located on the side of the third light-emitting unit away from the driving substrate.

20. The display panel of claim 19, wherein, The electrical connection structure includes a first electrical connection structure, a second electrical connection structure, a third electrical connection structure, and a fourth electrical connection structure; The first semiconductor layer and the second semiconductor layer of the first light-emitting unit are respectively electrically connected to the first contact and the common electrode layer on the driving substrate through the first bottom conductive layer located on the side of the first light-emitting unit close to the driving substrate and the first electrical connection structure located on the side of the first light-emitting unit away from the driving substrate. The first semiconductor layer and the second semiconductor layer of the second light-emitting unit are respectively electrically connected to the second contact and the common electrode layer on the driving substrate through the second electrical connection structure located on the side of the second light-emitting unit close to the driving substrate and the third electrical connection structure located on the side of the second light-emitting unit away from the driving substrate. The first semiconductor layer of the third light-emitting unit is electrically connected to the third contact on the driving substrate through the fourth electrical connection structure located on the side of the third light-emitting unit near the driving substrate, and the common electrode layer is disposed on the second semiconductor layer of the third light-emitting unit and electrically connected to the second semiconductor layer.

21. The display panel of claim 20, wherein, The second electrical connection structure is located on the side of the first light-emitting unit and outside the first light-emitting unit. The first electrical connection structure and the fourth electrical connection structure are respectively located on the side of the second light-emitting unit and outside the second light-emitting unit. The third electrical connection structure is located on the side of the third light-emitting unit and outside the third light-emitting unit.

22. A display device comprising the display panel according to any one of claims 1-21.

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