Display panel and display device

Abstract

The embodiment of the invention discloses 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 a micro-display unit are vertically stacked in the thickness direction of the display panel; orthographic projections of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit on the driving substrate are overlapped and form a projection overlapping area, and at least one of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit is electrically connected with the driving substrate through an electric connection structure. The orthographic projection of the electric connection structure on the driving substrate is located outside the projection overlapping area, and the orthographic projection of the electric 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. The light-emitting area of the light-emitting unit in the micro-display unit is increased, and the display effect is improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] 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.

[0003] Existing display panels have high requirements for resolution, which requires a smaller area of ​​the Micro-LED chip. In this case, the light-emitting area of ​​the light-emitting unit in the Micro-LED chip is smaller, affecting the display effect. Summary of the invention

[0004] The present invention provides a display panel and a display device, so as to increase the light-emitting area of ​​a light-emitting unit and improve the display effect while ensuring a high resolution of the display panel.

[0005] According to one aspect of the present invention, there is provided a display panel, comprising: a driving substrate and a plurality of micro display units disposed on the driving substrate;

[0006] The micro display unit includes 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; 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 overlapping area;

[0007] 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 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.

[0008] According to another aspect of the present invention, another display panel is provided, comprising a driving substrate and a micro display unit disposed on the driving substrate, wherein the micro display unit comprises a first light emitting unit, a second light emitting unit, and a third light emitting unit vertically stacked along a thickness direction of the display panel;

[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;

[0010] 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, and 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 in the common projection area;

[0011] The electrical connection structure is located on a side surface of at least one of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit; the side surface intersects with a horizontal direction, and the horizontal direction is perpendicular to the thickness direction.

[0012] According to another aspect of the present invention, there is provided another display panel, comprising a driving substrate and a micro display unit disposed on the driving substrate, wherein the driving substrate is used to drive the micro display unit to emit light;

[0013] The micro display unit includes 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; the second light emitting unit is arranged on the first light emitting unit, and the third light emitting unit is arranged on the second light emitting unit;

[0014] 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 a side of the light-emitting unit close to the driving substrate;

[0015] 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 micro display unit through an electrical connection structure located on a side of the light-emitting unit away from the driving substrate; the common electrode layer is located on a side of the third light-emitting unit away from the driving substrate.

[0016] According to yet another aspect of the present invention, a display device is provided, comprising the display panel according to any embodiment of the present invention.

[0017] The display panel and the display device of the embodiment of the present invention are arranged in a display panel, and the first light-emitting unit, the second light-emitting unit and the third light-emitting unit in the 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 the driving substrate overlap, and 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 through 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, so that the light-emitting area of ​​the light-emitting unit in the micro-display unit can be increased on the basis of ensuring the resolution of the display panel, which is beneficial to the improvement of the display effect.

[0018] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a top view of a display panel provided by an embodiment of the present invention;

[0021] Figure 2 is a schematic cross-sectional structure diagram of a micro display unit provided by an embodiment of the present invention;

[0022] Figure 3 is a schematic cross-sectional structure diagram of another micro display unit provided by an embodiment of the present invention;

[0023] Figure 4 is a top view along the top surface of the first light emitting unit;

[0024] Figure 5 is a top view along the top surface of the second light emitting unit;

[0025] Figure 6 is a top view along the top surface of the third light emitting unit;

[0026] Figure 7 is a schematic diagram of a first overlapping area of ​​orthographic projections of a first light emitting unit and a second light emitting unit on a driving substrate;

[0027] Figure 8 is a schematic diagram of a second overlapping area of ​​the orthographic projections of the second light emitting unit and the third light emitting unit on the driving substrate;

[0028] Fig. 9 is a schematic diagram of a third overlapping area of ​​the orthographic projections of the first light emitting unit and the third light emitting unit on the driving substrate;

[0029] Fig.10 is a schematic diagram of a common projection area of ​​a first light emitting unit, a second light emitting unit, and a third light emitting unit;

[0030] Fig.11 is a schematic diagram of yet another third overlapping region of the orthographic projections of the first light emitting unit and the third light emitting unit on the driving substrate;

[0031] Fig.12 It is a structural schematic diagram of a micro display unit array in a display panel;

[0032] Fig.13 is a cross-sectional view of another display panel provided by an embodiment of the present invention;

[0033] Fig.14 is a schematic diagram of the structure of another micro-display unit array in a display panel;

[0034] Fig.15 and Fig.16 is a schematic diagram of the structure after step S1 is completed;

[0035] Fig.17 and Fig.18 is a schematic diagram of the structure after step S2 is completed;

[0036] Fig.19 , Fig. 20 and Fig.21 is a schematic diagram of the structure after step S3 is completed;

[0037] Fig. 22 and Fig.23 is a schematic diagram of the structure after step S4 is completed;

[0038] Fig.24 and Fig.25 It is a schematic diagram of the structure after step S5 is completed.

[0039] Fig.26 , Fig. 27 and Fig.28 is a schematic diagram of the structure after step S6 is completed; DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0042] Figure 1 is a top view of a display panel provided by an embodiment of the present invention, Figure 2 is a schematic cross-sectional structure diagram of a micro display unit provided in an embodiment of the present invention, Figure 3 is a schematic cross-sectional structure diagram of another micro display unit provided by an embodiment of the present invention, referring to Figure 1-Figure 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, wherein: Figure 2 Can correspond Figure 6 Cut along A1-A2 to get: Figure 3 Can correspond Figure 6 Obtained by cutting along B1-B2. Figure 1-Figure 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 and form a projection overlapping 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 the electrical connection structure 14; the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is located outside the projection overlapping 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.

[0043] The driving substrate 110 includes a driving circuit, which can provide a driving signal to the micro display unit, thereby driving the micro display unit to emit light.

[0044] The micro display 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, for example, including a first light emitting unit 141, a second light emitting unit 142, and a third light emitting unit 143 that are stacked. Optionally, the second light emitting unit 142 is disposed on a side of the first light emitting unit 141 away from the driving substrate 110, and the third light emitting unit 143 is disposed on a 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 light of different colors, such as red light, blue light, green light, or red light, green light, blue light, or blue light, green light, red light, or blue light, red light, green light, or green light, blue light, red light, or green light, red light, blue light; 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 light of the same color. The first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143 respectively include a first semiconductor layer, a light-emitting layer and a second semiconductor layer, and the first semiconductor layer, the light-emitting layer and the second semiconductor layer are stacked in the thickness direction y of the display panel. Among them, 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, which may be a single quantum well layer or a multi-quantum well layer, for example, a multi-quantum well layer of InGaN / GaN. The electrical connection structure 14 includes a conductive material. In some optional embodiments, the material of the electrical connection structure 14 may be a metal material. A plurality of micro display units are arranged in an array on the driving substrate 110 to form a micro display unit array 130.

[0045] The first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143 in the micro-display unit are stacked vertically along the thickness direction y of the display panel, which can reduce the plane area occupied by the micro-display unit, reduce the size of the micro-display unit, and help improve the resolution of the display panel. In addition, 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 and form a projection overlap area, that is, the orthographic projections of any two 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. In this way, the light-emitting areas of the first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143 can be made larger, and the light-emitting areas of the first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143 are increased on the basis of ensuring the resolution of the display panel.

[0046] Continue to refer Figure 1-Figure 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 through 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 through the electrical connection structure 14, and at least one is electrically connected to the driving substrate 110 through a side lead, wherein the side lead may be electrically connected to the light emitting unit at one end, 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 to the driving substrate 110. In other optional embodiments, the first light emitting unit 141, the second light emitting unit 142, and the third light emitting unit 143 are all electrically connected to the driving substrate 110 through the electrical connection structure 14.

[0047] Figure 7 is a schematic diagram of a first overlapping area of ​​the orthographic projection of the first light emitting unit and the second light emitting unit on the driving substrate, Figure 8 is a schematic diagram of a second overlapping area of ​​the orthographic projection of the second light emitting unit and the third light emitting unit on the driving substrate, Fig. 9 is a schematic diagram of a third overlapping area of ​​the orthographic projection of the first light emitting unit and the third light emitting unit on the driving substrate, with reference to Figure 7-Figure 9 , the projection overlap 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 orthographic projection intersection region 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. 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 a first overlapping area 210. 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 a second overlapping area 220. Fig. 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 area 230. Figure 7-Figure 9 It can be seen that the projection overlap area 200 formed by the overlap 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 is Fig. 9 The third overlap regions 230 shown are identical.

[0048] The orthographic projection of the electrical connection structure 14 on the drive substrate 110 is located outside the projection overlap region 200, and the orthographic projection of the electrical connection structure 14 on the drive 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 drive substrate 110. Optionally, the orthographic projection of the electrical connection structure 14 on the drive substrate 110 is at least within the orthographic projection of the light-emitting unit connected to the electrical connection structure 14 on the drive substrate 110; the orthographic projection of the electrical connection structure 14 on the drive 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 drive substrate 110. The above-mentioned light-emitting unit may be the first light-emitting unit 141, the second light-emitting unit 142 or the third light-emitting unit 143. Exemplarily, the first light-emitting unit 141 is electrically connected to the drive substrate 110 through the first electrical connection structure 1412, and the orthographic projection of the first electrical connection structure 1412 on the drive substrate 110 is within the orthographic projection of the first light-emitting unit 141 on the drive substrate 110. The first electrical connection structure 1412 is not electrically connected to the second light-emitting unit 142 and the third light-emitting unit 143, and 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 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 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, 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, the second light-emitting unit 142 and the third light-emitting unit 143 on the driving substrate 110. Fig.10 It 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, wherein the common projection area 300 is the union area of ​​the positive 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.

[0049] By setting the orthographic projection of the electrical connection structure 14 on the driving substrate 110 to be outside the projection overlap area 200, 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. On the one hand, it can be ensured that the electrical connection structure 14 can realize the electrical connection 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, while not being electrically connected to other light-emitting units, thereby ensuring the performance of the micro-display unit. On the other hand, the spatial structure within the micro-display unit is effectively utilized, so that when the plane size of the micro-display unit is constant, each light-emitting unit can have a larger light-emitting area, which is conducive to improving the display effect.

[0050] In the display panel of the present embodiment, in the display panel, the first light-emitting unit, the second light-emitting unit and the third light-emitting unit in the 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 the driving substrate overlap and 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 through 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, so that the light-emitting area of ​​the light-emitting unit in the micro-display unit can be increased on the basis of ensuring the resolution of the display panel, which is beneficial to the improvement of the display effect.

[0051] Combination 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 area 210, wherein the first overlapping area 210 includes a first central area 211 and a first edge area 212, and the first edge area 212 surrounds the first central area 211. 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 area 220, wherein the second overlapping area 220 includes a second central area 221 and a second edge area 222, and the second edge area 222 surrounds the second central area 221. Fig.11 is a schematic diagram of another third overlapping area of ​​the orthographic projection of the first light emitting unit and the third light emitting unit on the driving substrate, combined with Fig. 9 and Fig.11The 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 area 230, wherein the third overlapping area 230 includes a third central area 231 and a third edge area 232, and the third edge area 232 surrounds the third central area 231. The projection overlapping area 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 overlaps with Fig. 9 The third overlap regions 230 shown are identical.

[0052] refer to Fig. 9 and Fig.11 Optionally, the projection overlapping area includes a central projection overlapping area 201 and an edge projection overlapping area 202, and the edge projection overlapping area 202 surrounds the central projection overlapping area 201; there is a gap 2021 in the edge projection overlapping area 202, and the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is located in the gap 2021.

[0053] The central projection overlap region 201 of the projection overlap region 200 overlaps with the third central region 231. In some optional embodiments, the central projection overlap region 201 of the projection overlap region 200 overlaps with the first central region 211 and / or the second central region 221. Specifically, there is a gap 2021 in the edge projection overlap region 202, and the gap 2021 may correspond to 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. Accordingly, 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. Exemplarily, the notch 2021 of 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, then 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 layer (including the first semiconductor layer, the light-emitting layer and the second semiconductor layer) in the first light-emitting unit 141 is not included. By setting the notch 2021 in the edge projection overlap region 202, the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is located in the notch 2021. On the one hand, the electrical connection structure 14 can be located at a position relative to the edge of the micro-display unit, reducing the influence of the setting of the electrical connection structure 14 on the light-emitting effect of the micro-display unit; on the other hand, 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 other light-emitting units, thereby ensuring the performance of the micro-display unit.

[0054] Continue to refer Fig. 9 and Fig.11 Optionally, the notch 2021 is recessed toward the central projection overlap region 201. The edge of the notch may be Fig. 9 The arc shape shown can also be Fig.11 The orthographic projection of the electrical connection structure 14 on the driving substrate 110 or the cross-sectional shape of the electrical connection structure 14 may be circular or rectangular, or may be other shapes, which are not specifically limited in the embodiment of the present invention.

[0055] like Fig. 9 and Fig.11 As shown, optionally, the central projection overlapping region 201 is a rectangle, and the edge projection overlapping region 202 extends along each edge of the central projection overlapping region 201 in a direction away from the central projection overlapping region 201 .

[0056] Optionally, the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is located between adjacent edge projection overlapping regions 202 , and the notch 2021 is recessed toward the vertex of the central projection overlapping region 201 .

[0057] Among them, the adjacent edge projection overlapping areas 202 may correspond to two edge projection overlapping areas 202 extending along the adjacent two sides of the rectangle of the central projection overlapping area 201 in a direction away from the central projection overlapping area 201. Accordingly, the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is near the vertex position of the central projection overlapping area 201, that is, the electrical connection structure 14 is located at a corner position in the micro display unit, so that the first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143 can all have a large and continuous light-emitting area, thereby ensuring the display effect of the display panel.

[0058] 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, and the side intersects with the horizontal direction, and the horizontal direction is perpendicular to the thickness direction y. The electrical connection structure 14 is arranged on the side of the light-emitting unit, which means that the electrical connection structure 14 is arranged on the outside of the light-emitting unit (the first light-emitting unit 141, the second light-emitting unit 142 or the third light-emitting unit 143) and will not be surrounded by the light-emitting unit. In this way, compared with the structure in which the electrical connection structure 14 is surrounded by the light-emitting unit, the preparation of the electrical connection structure 14 can be realized during the stacking process of the first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143 when the micro-display unit in the display panel is prepared, and the preparation process is relatively simple and easy to implement.

[0059] Continue to refer Figure 1-Figure 11Optionally, 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 through the third electrical connection structure 1422. The fourth electrical connection structure 1431 is electrically connected to the third contact 113; the orthographic projection of the first electrical connection structure 1412 on the drive substrate 110 is located within the orthographic projection of the first light-emitting unit 141 on the drive substrate 110; the orthographic projection of the second electrical connection structure 1421 on the drive substrate 110 is within the orthographic projection of the second light-emitting unit 142 on the drive substrate 110, and within the orthographic projection of the third light-emitting unit 143 on the drive substrate 110; the orthographic projection of the third electrical connection structure 1422 on the drive substrate 110 is within the orthographic projection of the second light-emitting unit 142 on the drive substrate 110, and within the orthographic projection of the first light-emitting unit 141 on the drive substrate 110; the orthographic projection of the fourth electrical connection structure 1431 on the drive substrate 110 is located within the orthographic projection of the third light-emitting unit 143 on the drive substrate 110; the common electrode layer 143B is located on a side of the third light-emitting unit 143 away from the drive substrate 110, and is electrically connected to the second semiconductor layer of the third light-emitting unit 143.

[0060] 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. The 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 may refer to the direct contact between the first semiconductor layer of the first light-emitting unit 141 and the first contact 111. The indirect electrical connection between the first semiconductor layer of the first light-emitting unit 141 and the first contact 111 may refer to the electrical connection between the first semiconductor layer of the first light-emitting unit 141 and the first contact 111 through other conductive structures. Optionally, the display panel further includes a first bottom conductive layer 141A corresponding to the micro-display unit one by one; 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 may be a metal material. The first bottom conductive layer 141A may play a role in current expansion and / or reflection.

[0061] Among them, the first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143 in the micro display unit can be a common cathode structure or a common anode structure. In the common cathode structure, the common electrode layer 143B is a 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 anode of the first light-emitting unit 141, the anode of the second light-emitting unit 142 and the anode of the third light-emitting unit 143 respectively; in the common anode structure, the common electrode layer 143B is a 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 cathode of the first light-emitting unit 141, the cathode of the second light-emitting unit 142 and the cathode of the third light-emitting unit 143 respectively.

[0062] refer to Figure 2 and Figure 3Optionally, the micro display 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 a side of the first light-emitting unit 141 close to the second light-emitting unit 142; the second bottom conductive layer 142A is disposed on a side of the second light-emitting unit 142 close to the first light-emitting unit 141; the second top conductive layer 142B is disposed on a side of the second light-emitting unit 142 close to the third light-emitting unit 143; and the third bottom conductive layer 143A is disposed on a side of the third light-emitting unit 143 close to 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 may be transparent conductive materials.

[0063] Optionally, the micro display 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.

[0064] Optionally, the electrical connection structure is an electrode column, 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 respectively the first electrode column, the second electrode column, the third electrode column, and the fourth electrode column. Taking the case where the micro display unit is a common cathode structure as an example, the first electrode column and the third electrode column are respectively connected to the common electrode layer 143B as cathode columns; the second electrode column serves as the anode column of the second light-emitting unit 142, and the fourth electrode column serves as the anode column of the third light-emitting unit 143.

[0065] Combination Figure 1 Optionally, a plurality of micro display units form a micro display unit array, and the driving substrate 110 further 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.

[0066] In some optional embodiments, the peripheral common electrode 120 can be formed integrally with the common electrode layer 143B, and the peripheral common electrode 120 and the common electrode layer 143B are made of the same material. In other optional embodiments, the peripheral common electrode 120 and the common electrode layer 143B can also be formed in steps, in which case the material of the peripheral common electrode 120 and the common electrode layer 143B can be the same or different.

[0067] In this embodiment, the peripheral common electrode 120 at least partially surrounds the micro display unit array. In some optional embodiments, the peripheral common electrode can be a ring structure, and the micro display unit array can be arranged in the ring structure. In this way, the peripheral common electrode can transmit electrical signals to the common electrode of the micro display unit array from multiple directions, which is beneficial to improving the display uniformity of the display panel.

[0068] Fig.12 This is a schematic diagram of the structure of a micro display unit array in a display panel. Fig. 9 and Fig.12 , the central projection overlap region 201 of the projection overlap region 200 is a rectangle, 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 respectively located at the four vertices of the rectangle. In this way, on the one hand, the electrical connection structure 14 can be evenly distributed at the vertices of the central projection overlap region 201, and the spatial structure in the micro display unit can be more effectively utilized, so that when the plane occupied area of ​​the micro display unit is certain, the first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143 can have a larger light-emitting area. On the other hand, the electrical connection structure 14 exists at the four vertices of the rectangle, so that the light-emitting effect of the edge area of ​​the micro display unit is more similar to the degree of influence of the electrical connection structure 14, which is conducive to ensuring the uniformity of light emission. In addition, the first light-emitting unit 141, the second light-emitting unit 142 and the third light-emitting unit 143 respectively have corresponding electrically connected electrical connection structures 14, which is conducive to reducing 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.

[0069] In some optional embodiments of the present invention, the first electrical connection structure 1412, the third electrical connection structure 1422 and the common electrode layer 143B are formed in one piece, so as to reduce the process steps of the display panel and simplify the manufacturing process of the display panel.

[0070] Fig.13 is a cross-sectional view of another display panel provided by an embodiment of the present invention, Fig.13 Can correspond Figure 6 Optionally, the second electrical connection structure 1421 is electrically connected to the second light-emitting unit 142 via a second metal layer 1421A located on a side of the second electrical connection structure 1421 away from the drive substrate 110; and / or the fourth electrical connection structure 1431 is electrically connected to the third light-emitting unit 143 via a third metal layer 1431A located on a side of the fourth electrical connection structure 1431 away from the drive substrate 110.

[0071] Specifically, the second metal layer 1421A can be used as a bonding layer between the second electrical connection structure 1421 and the second light-emitting unit 142, so that the second electrical connection structure 1421 and the second light-emitting unit 142 are electrically connected through metal bonding, thereby ensuring the reliability of the connection between the second electrical connection structure 1421 and the second light-emitting unit 142. On the other hand, the second metal layer 1421A can be used to reflect the light emitted by the second light-emitting unit 142 and the third light-emitting unit 143, thereby increasing the light output of the second light-emitting unit 142 and the third light-emitting unit 143.

[0072] On the one hand, the third metal layer 1431A can be used as a bonding layer between the fourth electrical connection structure 1431 and the third light emitting unit 143, so that the fourth electrical connection structure 1431 and the third light emitting unit 143 are electrically connected through metal bonding, thereby ensuring the reliability of the connection between the fourth electrical connection structure 1431 and the third light emitting unit 143. On the other hand, the third metal layer 1431A can be used to reflect the light emitted by the third light emitting unit 143, thereby increasing the light output of the third light emitting unit 143.

[0073] In some optional embodiments of the present invention, the cross-sectional area of ​​the second metal layer 1421A is larger than the cross-sectional area of ​​the second electrical connection structure 1421, and is less than or equal to the area of ​​the second light-emitting unit extending above the second electrical connection structure 1421 from the first light-emitting unit 141; and / or, the cross-sectional area of ​​the third metal layer 1431A is larger than the cross-sectional area of ​​the fourth electrical connection structure 1431, and is less than or equal to the area of ​​the third light-emitting unit 143 extending above the fourth electrical connection structure 1431 from the second light-emitting unit 142; the cross-sectional area is the cross-sectional area of ​​the cross section in the horizontal direction, and the horizontal direction is perpendicular to the thickness direction y.

[0074] The cross-sectional area of ​​the second metal layer 1421A is set to be larger 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 out of the first light-emitting unit 141 above the second electrical connection structure 1421. The area above the second electrical connection structure 1421 (the area on the side of the second electrical connection structure 1421 away from the driving substrate 110) can be fully utilized, 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, thereby ensuring the light output of the first light-emitting unit 141.

[0075] The cross-sectional area of ​​the third metal layer 1431A is set 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 from the second light-emitting unit 142. This can fully utilize the area above the fourth electrical connection structure 1431, so that the cross-sectional area of ​​the third metal layer 1431 is larger, thereby better reflecting the light emitted by the third light-emitting unit 143 and avoiding blocking the light emitted by the first light-emitting unit 141 and the second light-emitting unit 142, thereby ensuring the light output of the first light-emitting unit 141 and the light output of the second light-emitting unit 142.

[0076] Fig.14 This is a schematic diagram of the structure of another micro-display unit array in a display panel. Fig.14 Optionally, in two micro-display units arranged along the diagonal direction of the micro-display unit array or the diagonal direction of the micro-display unit, the first electrical connection structure 1412 of one micro-display unit and the third electrical connection structure 1422 of the other micro-display unit are formed integrally. In this way, in two micro-display units arranged along the diagonal direction of the micro-display unit array or the diagonal direction of the micro-display unit, the first electrical connection structure 1412 of one micro-display unit and the third electrical connection structure 1422 of the other micro-display unit can be formed simultaneously during preparation, thereby simplifying the preparation process. Fig.14 As shown, 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.

[0077] Continue to refer Fig.14 Optionally, the first electrical connection structure 1412 includes a first base 1412A and a first extension 1412B, the first extension 1412B is located on a side of the first base 1412A close to another micro-display unit arranged along the diagonal direction of the micro-display unit array or the diagonal direction of the micro-display unit; the third electrical connection structure 1422 includes a second base 1422A and a second extension 1422B, the second extension 1422B is located on a side of the second base 1422A close to another micro-display unit arranged along the diagonal direction of the micro-display unit array or the diagonal direction of the micro-display unit; of the two micro-display units arranged along the diagonal direction of the micro-display unit array or the diagonal direction of the micro-display unit, 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.

[0078] The embodiment of the present invention also provides another display panel, combining Figure 1-Figure 14 The display panel 100 includes a driving substrate 110 and a micro display unit 140 disposed on the driving substrate 110, wherein 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 on the driving substrate 110. A common projection area is formed, and the common projection area includes the orthographic projection of the first light-emitting unit 141 on the driving substrate 110, 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; the orthographic projection of the electrical connection structure 14 on the driving substrate 110 is located within the common projection area 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 surface intersects with the horizontal direction, and the horizontal direction is perpendicular to the thickness direction y.

[0079] The display panel of this embodiment effectively utilizes the spatial structure in the micro-display unit, so that when the plane size of the micro-display unit is constant, each light-emitting unit can have a larger light-emitting area, which is conducive to improving the display effect. In addition, by arranging the electrical connection structure 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 preparation of the electrical connection structure can be achieved during the preparation process of the display panel micro-display unit. Compared with the display panel structure in which the electrical connection structure is surrounded by the light-emitting unit or the display panel structure in which the electrical connection structure is arranged on the side of the light-emitting unit, the preparation process is relatively simple and easy to achieve.

[0080] The embodiment of the present invention further provides another display panel, referring to Figure 1-Figure 14The display panel includes a driving substrate 110 and a micro display unit 140 arranged on the driving substrate 110, and the driving substrate 110 is used to drive the micro display unit 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 arranged on the first light-emitting unit 141, and the third light-emitting unit 143 is arranged on the second light-emitting unit 142; 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 a side of the light-emitting unit close 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 a common electrode layer 143B of the micro display unit through an electrical connection structure located on a side of the light-emitting unit away from the driving substrate 110; the common electrode layer 143B is located on a side of the third light-emitting unit 143 away from the driving substrate 110.

[0081] The display panel of this embodiment effectively utilizes the space structure in the micro-display unit, so that when the plane size of the micro-display unit is constant, each light-emitting unit can have a larger light-emitting area, which is beneficial to improving the display effect.

[0082] refer to Figure 2 and Figure 3 , in some optional embodiments of the present invention, 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 ;

[0083] 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 far from the driving substrate 110 respectively.

[0084] The first semiconductor layer and the second semiconductor layer of the second light emitting unit 142 are electrically connected to the second contact 112 and the common electrode layer on the driving substrate 110 through a second electrical connection structure 1421 located on the side of the second light emitting unit 142 close to the driving substrate 110 and a third electrical connection structure 1422 located on the side of the second light emitting unit 142 far from the driving substrate 110, respectively.

[0085] 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 a fourth electrical connection structure 1431 located on the side of the third light emitting unit 143 close to the driving substrate 110, and the common electrode layer 143B is arranged on the second semiconductor layer of the third light emitting unit 143 and electrically connected to the second semiconductor layer.

[0086] Continue to refer Figure 2 and Figure 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.

[0087] The following is an explanation of a process for preparing a display panel, which is applicable to the display panel of any of the above-mentioned embodiments of the present invention.

[0088] The manufacturing process of the display panel may include the following steps S1 to S7.

[0089] Fig.15 and Fig.16 is a schematic diagram of the structure after step S1 is completed. Fig.15 Can correspond Figure 2 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Fig.16 Can correspond Figure 3 or Fig.13 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Fig.15 and Fig.16 As shown, S1 includes: laminating 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 setting a first top conductive layer 141B on the top surface of the first light-emitting unit 141 (the first top conductive layer 141B may not be set in some embodiments).

[0090] Fig.17 and Fig.18 is a schematic diagram of the structure after step S2 is completed. Fig.17 Can correspond Figure 2 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Fig.18 Can correspond Figure 3 or Fig.13 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Fig.17 and Fig.18As shown, S2 includes: forming a first insulating layer 144 on the surface of the first light-emitting unit 141 after completing step S1, and 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, and the second electrical connection structure 1421 is electrically connected to the second contact 112 on the driving substrate 110 toward one end of the driving substrate 110.

[0091] Fig.19 , Fig. 20 and Fig.21 is a schematic diagram of the structure after step S3 is completed. Fig.19 Can correspond Figure 2 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Fig. 20 Can correspond Figure 3 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Fig.21 Can correspond Fig.13 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Figure 19-21 As shown, 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 away from the drive substrate 110, and then the second light-emitting unit 142 is arranged 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 first arranged on the side of the second light-emitting unit 142 facing the drive substrate 110, and then the second light-emitting unit 142 with the second bottom conductive layer 142A is arranged on the first insulating layer 144. Fig.21 As shown, 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, and the second metal layer 1421A is electrically connected to the end of the second electrical connection structure 1421 facing the driving substrate 110; in other embodiments, the second metal layer 1421A may be first formed at a position corresponding to the side of the second light-emitting unit 142 facing the driving substrate 110, and the second metal layer 1421A is directly (without the second bottom conductive layer 142A) connected to the first insulating layer 144. The second bottom conductive layer 142A) or indirectly (with 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 100; in other embodiments, the second bottom conductive layer 142A can be firstly arranged on the side of the second light-emitting unit 142 facing the driving substrate 110, and then the second metal layer 1421A can be arranged on the second bottom conductive layer 142A, and then the second light-emitting unit 142 with the second bottom conductive layer 142A and the second metal layer 1421A can be arranged on the first insulating layer 144.

[0092] Fig. 22 and Fig.23 is a schematic diagram of the structure after step S4 is completed. Fig. 22 Can correspond Figure 2 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Fig.23 Can correspond Figure 3 or Fig.13 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Fig. 22 and Fig.23 As shown, S4 includes: forming a second insulating layer 145 around the second light-emitting unit 142, so that the top surface of the second insulating layer 145 and the top surface of the second light-emitting unit 142 are located in the same plane, and then forming a second top surface conductive layer 142B on the top surface of the second light-emitting unit 142 (the second top surface conductive layer 142B may not be formed in some embodiments).

[0093] Fig.24 and Fig.25 is a schematic diagram of the structure after step S5 is completed. Fig.24 Can correspond Figure 2 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Fig.25 Can correspond Figure 3 or Fig.13 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Fig.24 and Fig.25 As shown, S5 includes: forming a third insulating layer 146 on the surface of the light-emitting unit after completing step S4, and then 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 the fourth electrical connection structure 1431 is electrically connected to the second contact 112 on the driving substrate 110 toward one end of the driving substrate 110.

[0094] Fig.26 , Fig. 27 and Fig.28 is a schematic diagram of the structure after step S6 is completed. Fig.26 Can correspond Figure 2 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Fig. 27 Can correspond to the figure Figure 3 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Fig.28 Can correspond Fig.13 The cross-sectional view of the display panel shows the intermediate structure during the preparation process. Figure 26-Figure 28As shown, 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 away from the drive substrate 110, and a third light-emitting unit 143 is arranged on the third bottom conductive layer 143A (the third bottom conductive layer 143A may not be formed in some embodiments), and the first semiconductor layer of the third light-emitting unit 143 is electrically connected to the third bottom conductive layer 143A. Fig.28 As shown, before forming the third bottom conductive layer 143A, the third metal layer 1431A may be formed, and the third metal layer 1431A is electrically connected to the end of the fourth electrical connection structure 1431 away from the driving substrate 110 on the side facing the driving substrate 110. In other embodiments, the third metal layer 1431A may be first formed at a corresponding position of the third light-emitting unit 143 facing the driving substrate 110, and 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 arranged on the side of the third light-emitting unit 143 facing the driving substrate 110, and then the third metal layer 1431A is arranged on the third bottom conductive layer 143A, and then the third light-emitting unit 143 with the third bottom conductive layer 143A and the third metal layer 1431A is arranged on the third insulating layer 146.

[0095] Figure 2 and Figure 3 It can be a schematic diagram of the structure after step S7 is completed. Figure 2 and Figure 3 , S7 includes: forming a fourth insulating layer 147 around the third light-emitting unit 143, so that the top surface of the fourth insulating layer 147 and the top surface of the third light-emitting unit 143 are located in the same plane, and then 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 are electrically connected to the first light-emitting unit 141 and the second light-emitting unit 142 at one end facing the driving substrate 110, and then forming a common electrode layer 143B on the top surface of the third light-emitting unit 143, the common electrode layer 143B is electrically connected to the first electrical connection structure 1412 and the third electrical connection structure 1422 at one end away from the driving substrate 110, and the common electrode layer 143B is 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 can also be formed integrally).

[0096] An embodiment of the present invention further provides a display device, which includes a display panel according to any of the above embodiments of the present invention and has the beneficial effects of the display panel according to any of the above embodiments of the present invention, which will not be described in detail herein.

[0097] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0098] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display panel, characterized in that: include: 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 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 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 through an electrical connection structure; The orthographic projection of the electrical connection structure on the drive substrate is outside the projection overlapping area, and the orthographic projection of the electrical connection structure on the drive 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 drive substrate.

2. The display panel according to claim 1, characterized in that: The projection overlap area includes a central projection overlap area and an edge projection overlap area, and the edge projection overlap area surrounds the central projection overlap area; 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 in the gap.

3. The display panel according to claim 2, characterized in that: The notch is recessed toward the central projected overlapping area.

4. The display panel according to claim 2, characterized in that: The central projection overlapping area is rectangular, and the edge projection overlapping area extends along each edge of the central projection overlapping area in a direction away from the central projection overlapping area.

5. The display panel according to claim 4, characterized in that: The orthographic projection of the electrical connection structure on the driving substrate is located between adjacent edge projection overlapping regions, and the notch is recessed toward the apex of the center projection overlapping region.

6. The display panel according to claim 1, characterized in that: The electrical connection structure is located on a side surface of at least one of the first light emitting unit, the second light emitting unit, and the third light emitting unit, and the side surface intersects with a horizontal direction, and the horizontal direction is perpendicular to the thickness direction.

7. The display panel according to any one of claims 1 to 6, characterized in that: 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 a side of the first light emitting unit away from the driving substrate; a first contact, a second contact and a third contact are provided on the driving substrate; 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, the first semiconductor layer of the second light-emitting unit is electrically connected to the second contact through the second electrical connection structure, 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 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 is 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 is 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 at a 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 according to claim 7, characterized in that: The plurality of micro display units form a micro display unit array. The driving substrate further includes a peripheral common electrode. The peripheral common electrode at least partially surrounds the micro display unit array and is electrically connected to the common electrode layer.

9. The display panel according to claim 7, characterized in that: It also includes a first bottom conductive layer corresponding to the micro display units one by one; 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 according to claim 9, characterized in that: The first bottom conductive layer includes a first metal layer.

11. The display panel according to claim 7, characterized in that: 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 four vertex positions of the rectangle.

12. The display panel according to claim 7, characterized in that: The electrical connection structure is an electrode column, and the first electrical connection structure, the second electrical connection structure, the third electrical connection structure, and the fourth electrical connection structure are respectively a first electrode column, a second electrode column, a third electrode column, and a fourth electrode column.

13. The display panel according to claim 7, characterized in that: The first electrical connection structure, the third electrical connection structure and the common electrode layer are formed integrally.

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

15. The display panel according to claim 14, characterized in that: The cross-sectional area of ​​the second metal layer is larger than the cross-sectional area of ​​the second electrical connection structure, and is smaller than or equal to the area of ​​the second light-emitting unit extending above the second electrical connection structure and extending out of the first light-emitting unit; and / or, The cross-sectional area of ​​the third metal layer is larger than the cross-sectional area of ​​the fourth electrical connection structure, and is smaller than or equal to the area of ​​the third light-emitting unit extending above the fourth electrical connection structure and extending out of the second light-emitting unit; The cross-sectional area is the cross-sectional area of ​​the cross section in the horizontal direction, and the horizontal direction is perpendicular to the thickness direction.

16. The display panel according to claim 7, characterized in that: In two micro-display units arranged along the diagonal direction of the micro-display unit array or the diagonal direction of the micro-display unit, the first electrical connection structure of one of the micro-display units and the third electrical connection structure of the other micro-display unit are formed integrally.

17. The display panel according to claim 16, characterized in that: The first electrical connection structure includes a first base and a first extension, wherein the first extension is located at a side of the first base close to another micro-display unit arranged along a diagonal direction of the micro-display unit array or a diagonal direction of the micro-display unit; the third electrical connection structure includes a second base and a second extension, wherein the second extension is located at a side of the second base close to another micro-display unit arranged along a diagonal direction of the micro-display unit array or a diagonal direction of the micro-display unit; The first base portion and the second base portion of two micro display units arranged along a diagonal direction of the micro display unit array or a diagonal direction of the micro display unit are electrically connected through the first extension portion and the second extension portion.

18. A display panel, characterized in that: It includes a driving substrate and a micro display unit arranged on the driving substrate, wherein the micro display unit includes 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, and 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 in the common projection area; The electrical connection structure is located on a side surface of at least one of the first light emitting unit, the second light emitting unit, and the third light emitting unit; the side surface intersects with a horizontal direction, and the horizontal direction is perpendicular to the thickness direction.

19. A display panel, characterized in that: It comprises a driving substrate and a micro display unit arranged on the driving substrate, wherein the driving substrate is used to drive the micro display 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 vertically stacked along the thickness direction of the display panel; the second light emitting unit is arranged on the first light emitting unit, and the third light emitting unit is arranged 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 a side of the light-emitting unit close 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 micro display unit through an electrical connection structure located on a side of the light-emitting unit away from the driving substrate; the common electrode layer is located on a side of the third light-emitting unit away from the driving substrate.

20. The display panel according to claim 19, characterized in that: 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 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 far from the driving substrate. The first semiconductor layer and the second semiconductor layer of the second light-emitting unit are electrically connected to the second contact and the common electrode layer on the driving substrate through the second electrical connection structure located at the side of the second light-emitting unit close to the driving substrate and the third electrical connection structure located at the side of the second light-emitting unit far from the driving substrate, respectively; 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 close to the driving substrate, and the common electrode layer is arranged on the second semiconductor layer of the third light-emitting unit and electrically connected to the second semiconductor layer.

21. The display panel according to claim 20, characterized in that: 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, and 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, characterized in that: A display panel comprising any one of claims 1-21.

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