Display panel and preparation method thereof

Abstract

The invention discloses a display panel and a preparation method thereof, and the display panel comprises a driving substrate which comprises a first voltage line and a second voltage line; the stacked light-emitting unit modules are arranged on one side of the driving substrate and comprise first light-emitting units and second light-emitting units which are stacked and correspond to each other, and each first light-emitting unit comprises a first light-emitting element and a first connecting electrode and a second connecting electrode which are spaced from each other; the first connecting electrodes and the second connecting electrodes are in one-to-one correspondence with the first voltage lines and the second voltage lines but are not electrically connected with the first voltage lines and the second voltage lines; the second light-emitting unit is arranged on one side of the first light-emitting unit and comprises a second light-emitting element, a third connecting electrode and a fourth connecting electrode, and the third connecting electrode and the fourth connecting electrode are electrically connected with the first voltage line and the second voltage line in a one-to-one correspondence mode. The orthographic projections of the first light-emitting element and the second light-emitting element on the driving substrate are at least partially overlapped. Through the arrangement, the problem that dead pixels of the display panel are difficult to repair in the prior art can be solved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a method for preparing the same. Background Art

[0002] Micro LED (micro light emitting diode) is an emerging display technology and is considered to be one of the strong contenders for the next generation of display technology. With its advantages of high brightness, high contrast, low power consumption, fast response time, long life, and high reliability, Micro LED technology has broad application prospects in high-end displays, wearable devices, augmented reality (AR) and virtual reality (VR) devices, and outdoor billboards.

[0003] However, in the prior art, the mass transfer technology yield of Micro LED display panels is low, and Micro LED display panels have the problem of difficulty in repairing bad pixels, and bad pixel repair can easily affect the resolution of the display panel. Summary of the invention

[0004] The present application mainly provides a display panel and a preparation method thereof to solve the problem of difficulty in repairing bad pixels of Micro LED display panels in the prior art.

[0005] In order to solve the above technical problems, a technical solution adopted by the present application is: to provide a display panel, comprising:

[0006] A driving substrate; the driving substrate comprises a first voltage line and a second voltage line; wherein one of the first voltage line and the second voltage line is a positive power supply voltage line, and the other is a ground voltage line;

[0007] A plurality of stacked light-emitting unit modules arranged at intervals are arranged on one side of the driving substrate; the stacked light-emitting unit module comprises a first light-emitting unit and a second light-emitting unit which are stacked and correspondingly arranged;

[0008] The first light-emitting unit includes a first light-emitting element and a first connection electrode and a second connection electrode arranged at intervals, the first light-emitting element is electrically connected to the first connection electrode and the second connection electrode respectively; the first connection electrode and the second connection electrode correspond to the first voltage line and the second voltage line one by one but are not all electrically connected;

[0009] The second light-emitting unit is arranged on a side of the first light-emitting unit away from the substrate, the second light-emitting unit includes a second light-emitting element and a third connecting electrode and a fourth connecting electrode arranged at intervals, the second light-emitting element is electrically connected to the third connecting electrode and the fourth connecting electrode respectively, the third connecting electrode and the fourth connecting electrode are electrically connected to the first voltage line and the second voltage line in a one-to-one correspondence; the orthographic projection of the first light-emitting element on the driving substrate at least partially overlaps with the orthographic projection of the second light-emitting element on the driving substrate.

[0010] In some embodiments, the first connection electrode of the stacked light-emitting unit module is disposed correspondingly to and electrically connected to the first voltage line, and the second connection electrode is disposed correspondingly to and not electrically connected to the second voltage line.

[0011] In some embodiments, it further comprises:

[0012] An independent light-emitting unit module is arranged on one side of the driving substrate and is spaced apart from the stacked light-emitting unit module; the independent light-emitting unit module includes the first light-emitting unit but does not include the second light-emitting element;

[0013] The first connection electrode and the second connection electrode of the independent light-emitting unit module are electrically connected to the first voltage line and the second voltage line in a one-to-one correspondence.

[0014] In some embodiments, the independent light emitting unit module further includes:

[0015] A first encapsulation layer, covering the first light-emitting unit; and

[0016] The third connecting electrode and the fourth connecting electrode are arranged on a side of the first packaging layer away from the driving substrate; the third connecting electrode and the fourth connecting electrode of the independent light-emitting unit module are electrically connected to the first connecting electrode and the second connecting electrode one by one; the first connecting electrode of the independent light-emitting unit module is directly arranged corresponding to and electrically connected to the first voltage line, and the second connecting electrode of the independent light-emitting unit module is electrically connected to the second voltage line through the fourth connecting electrode.

[0017] In some embodiments, the orthographic projection of the second light emitting element of the stacked light emitting unit module on the driving substrate overlaps with the orthographic projection of the first light emitting element on the driving substrate.

[0018] In order to solve the above technical problems, another technical solution adopted by the present application is: to provide a method for preparing a display panel, comprising:

[0019] A driving substrate is provided; the driving substrate comprises a first voltage line and a second voltage line; wherein one of the first voltage line and the second voltage line is a positive power supply voltage line, and the other is a ground voltage line;

[0020] A first light-emitting layer is prepared on one side of the driving substrate; the first light-emitting layer includes a plurality of first light-emitting units; the first light-emitting unit includes a first light-emitting element and a first connecting electrode and a second connecting electrode spaced apart from each other, the first light-emitting element is electrically connected to the first connecting electrode and the second connecting electrode respectively; wherein the first connecting electrode and the second connecting electrode correspond to the first voltage line and the second voltage line one by one but are not all electrically connected;

[0021] A second light-emitting layer is prepared on a side of the first light-emitting layer away from the driving substrate; the second light-emitting layer includes a plurality of second light-emitting units, and the plurality of second light-emitting units correspond to the plurality of first light-emitting units one by one; the second light-emitting unit includes a second light-emitting element and a third connection electrode and a fourth connection electrode spaced apart from each other, and the second light-emitting element is electrically connected to the third connection electrode and the fourth connection electrode respectively; wherein the third connection electrode and the fourth connection electrode are electrically connected to the first voltage line and the second voltage line one by one;

[0022] Detect whether there is an abnormal light-emitting unit among the multiple second light-emitting units; if there is an abnormal light-emitting unit, remove the light-emitting element of the abnormal light-emitting unit, and electrically connect the first light-emitting unit corresponding to the abnormal light-emitting unit to the first voltage line and the second voltage line, so that the first connecting electrode and the second connecting electrode of the first light-emitting unit corresponding to the abnormal light-emitting unit are electrically connected to the first voltage line and the second voltage line one by one.

[0023] In some embodiments, the step of preparing the first light-emitting layer on one side of the driving substrate specifically includes:

[0024] A plurality of first electrode pairs are provided at intervals on one side of the driving substrate; the first electrode pairs include the first connecting electrode and the second connecting electrode; the first connecting electrode is provided corresponding to and electrically connected to the first voltage line, and the second connecting electrode is provided corresponding to and not electrically connected to the second voltage line;

[0025] A plurality of the first light-emitting elements are transferred on one side of the driving substrate; the first light-emitting elements include a first epitaxial layer and a first contact electrode and a second contact electrode; the plurality of the first light-emitting elements are arranged in a one-to-one correspondence with the plurality of the first electrode pairs, and the first contact electrode and the second contact electrode are electrically connected to the first connection electrode and the second connection electrode in a one-to-one correspondence;

[0026] A first encapsulation layer is prepared on a side of the plurality of first light emitting elements away from the driving substrate, and a first via hole is formed in the first encapsulation layer that penetrates the first encapsulation layer and exposes the first connecting electrode.

[0027] In some embodiments, the step of preparing the second light-emitting layer on a side of the first light-emitting layer away from the driving substrate specifically includes:

[0028] A plurality of second electrode pairs are provided at intervals on a side of the first encapsulation layer away from the drive substrate; the second electrode pairs include the third connection electrode and the fourth connection electrode; the third connection electrode is electrically connected to the first connection electrode through the first via hole; the orthographic projection of the fourth connection electrode on the drive substrate partially overlaps with the orthographic projection of the second connection electrode on the drive substrate to form an overlapping area;

[0029] A plurality of second light-emitting elements are transferred on a side of the first encapsulation layer away from the drive substrate; the second light-emitting elements include a second epitaxial layer and a third contact electrode and a fourth contact electrode; the plurality of second light-emitting elements are arranged in one-to-one correspondence with the plurality of second electrode pairs, and the third contact electrode and the fourth contact electrode are electrically connected to the third connection electrode and the fourth connection electrode in one-to-one correspondence;

[0030] A second encapsulation layer is prepared on a side of the plurality of second light emitting elements away from the driving substrate.

[0031] In some embodiments, the step of removing the light emitting element of the abnormal light emitting unit and electrically connecting the first light emitting unit corresponding to the abnormal light emitting unit to the first voltage line and the second voltage line specifically includes:

[0032] removing the light emitting element of the abnormal light emitting unit and retaining the fourth connecting electrode of the abnormal light emitting unit;

[0033] forming a second via hole penetrating through the first encapsulation layer and exposing the second connection electrode in the first encapsulation layer corresponding to the overlapping area;

[0034] The fourth connection electrode is electrically connected to the second connection electrode through the second via hole.

[0035] In some embodiments, orthographic projections of the plurality of second light-emitting elements on the driving substrate overlap with orthographic projections of the plurality of first light-emitting elements on the driving substrate.

[0036] The beneficial effects of the present application are as follows: Different from the prior art, the present application discloses a display panel and a method for preparing the same, wherein the display panel comprises a driving substrate and a plurality of stacked light-emitting unit modules arranged at intervals; the driving substrate comprises a first voltage line and a second voltage line, wherein one of the first voltage line and the second voltage line is a positive power supply voltage line and the other is a ground voltage line; the plurality of stacked light-emitting unit modules arranged at intervals are arranged on one side of the driving substrate, the stacked light-emitting unit module comprises a first light-emitting unit and a second light-emitting unit arranged in a stacked and corresponding manner, wherein the first light-emitting unit comprises a first light-emitting element and a first connecting electrode and a second connecting electrode arranged at intervals, and the first The light-emitting element is electrically connected to the first connection electrode and the second connection electrode respectively; the first connection electrode and the second connection electrode correspond to the first voltage line and the second voltage line one by one but are not all electrically connected; the second light-emitting unit is arranged on the side of the first light-emitting unit away from the substrate, the second light-emitting unit includes a second light-emitting element and a third connection electrode and a fourth connection electrode arranged at intervals, the second light-emitting element is electrically connected to the third connection electrode and the fourth connection electrode respectively, the third connection electrode and the fourth connection electrode are electrically connected to the first voltage line and the second voltage line one by one, and the orthographic projection of the first light-emitting element on the driving substrate at least partially overlaps with the orthographic projection of the second light-emitting element on the driving substrate. Through the above arrangement, the problem of difficulty in repairing bad pixels of Micro LED display panels in the prior art can be effectively solved without affecting the resolution of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0038] Figure 1 is a schematic structural diagram of a first embodiment of a display panel provided in the present application;

[0039] Figure 2 is a schematic structural diagram of a second embodiment of a display panel provided in the present application;

[0040] Figure 3 yes Figure 1 A schematic diagram of the electrical connection method of the stacked light-emitting unit module of the provided display panel;

[0041] Figure 4 yes Figure 2 A schematic diagram of the electrical connection method of the independent light-emitting unit module of the provided display panel;

[0042] Figure 5It is a schematic diagram of a process of an embodiment of a method for manufacturing a display panel provided in the present application;

[0043] Figure 6 yes Figure 5 A schematic flow chart of an implementation method of step S2 in FIG.

[0044] Figure 7 yes Figure 5 A schematic flow chart of an implementation method of step S3 in FIG.

[0045] Figure 8 yes Figure 5 Schematic diagram of the process of step S4 in an implementation manner.

[0046] Figure Number:

[0047] Display panel 100; driving substrate 1; first voltage line L1; second voltage line L2; stacked light-emitting unit module 2; first light-emitting unit 3; first light-emitting element 31; first epitaxial layer 311; first contact electrode 312; second contact electrode 313; first connecting electrode 32; second connecting electrode 33; first electrode pair 34; second light-emitting unit 4; second light-emitting element 41; second epitaxial layer 411; third contact electrode 412; fourth contact electrode 413; third connecting electrode 42; fourth connecting electrode 43; second electrode pair 44; first packaging layer 5; first via 51; second via 52; independent light-emitting unit module 6; second packaging layer 7. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] The terms "first", "second", "third" in the embodiments of the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0050] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] See also Figures 1 to 4 , Figure 1 is a schematic structural diagram of a first embodiment of a display panel provided in the present application, Figure 2 is a schematic structural diagram of a second embodiment of a display panel provided in the present application, Figure 3 yes Figure 1 A schematic diagram of the electrical connection method of the stacked light-emitting unit module of the display panel is provided, Figure 4 yes Figure 2 A schematic diagram of the electrical connection method of the independent light-emitting unit module of the display panel is provided.

[0052] See also Figure 1 and Figure 2 An embodiment of the present application provides a display panel 100. In some implementations, the display panel 100 includes a driving substrate 1 and a plurality of stacked light-emitting unit modules 2 that are spaced apart.

[0053] The drive substrate 1 includes a first voltage line L1 and a second voltage line L2, one of the first voltage line L1 and the second voltage line L2 is a positive power supply voltage line (VDD), and the other is a ground voltage line (VSS). For example, the first voltage line L1 is a positive power supply voltage line, and the second voltage line L2 is a ground voltage line, or the first voltage line L1 is a ground voltage line, and the second voltage line L2 is a positive power supply voltage line. In some embodiments, the drive substrate 1 may further include a drive circuit layer (not shown) and a thin film transistor layer (not shown).

[0054] A plurality of stacked light emitting unit modules 2 arranged at intervals are arranged on one side of the driving substrate 1 , and the stacked light emitting unit module 2 includes first light emitting units 3 and second light emitting units 4 which are stacked and correspondingly arranged.

[0055] The first light-emitting unit 3 includes a first light-emitting element 31 and a first connection electrode 32 and a second connection electrode 33, and the first connection electrode 32 and the second connection electrode 33 are arranged at intervals. The first light-emitting element 31 is electrically connected to the first connection electrode 32 and the second connection electrode 33, respectively. Specifically, the first connection electrode 32 and the second connection electrode 33 form a first electrode pair 34, and a plurality of first light-emitting elements 31 are arranged in a one-to-one correspondence with a plurality of first electrode pairs 34. The first light-emitting element 31 includes a first epitaxial layer 311 and a first contact electrode 312 and a second contact electrode 313, and the first contact electrode 312 and the second contact electrode 313 are electrically connected to the first connection electrode 32 and the second connection electrode 33 in a one-to-one correspondence. The first connection electrode 32 and the second connection electrode 33 correspond to the first voltage line L1 and the second voltage line L2 in a one-to-one correspondence but are not all electrically connected.

[0056] It should be noted that not all of them are electrically connected here, specifically including: one of the first connection electrode 32 and the second connection electrode 33 is electrically connected to one of the positive power supply voltage line and the ground voltage line, and the other is not electrically connected to the other of the positive power supply voltage line and the ground voltage line; or, each of the first connection electrode 32 and the second connection electrode 33 is not electrically connected to each of the positive power supply voltage line and the ground voltage line. That is, only one of the connection electrodes is electrically connected to the corresponding voltage line, and the other connection electrode is not electrically connected to the corresponding voltage line; or, both connection electrodes are not electrically connected to the corresponding voltage line. For example, the first connection electrode 32 is electrically connected to the first voltage line L1, and the second connection electrode 33 is not electrically connected to the second voltage line L2; or, the first connection electrode 32 is not electrically connected to the first voltage line L1, and the second connection electrode 33 is electrically connected to the second voltage line L2; or, the first connection electrode 32 is not electrically connected to the first voltage line L1, and the second connection electrode 33 is not electrically connected to the second voltage line L2. Since the first connecting electrode 32 and the second connecting electrode 33 of the first light-emitting unit 3 are not electrically connected to the first voltage line L1 and the second voltage line L2, the first connecting electrode 32 and the second connecting electrode 33 of the first light-emitting unit 3 cannot receive the VDD signal and the VSS signal at the same time, and the first light-emitting element 31 cannot emit light. The first light-emitting element 31 only serves as a backup light-emitting element.

[0057] The second light-emitting unit 4 is arranged at a side of the first light-emitting unit 3 away from the driving substrate 1. The second light-emitting unit 4 includes a second light-emitting element 41 and a third connection electrode 42 and a fourth connection electrode 43. The third connection electrode 42 and the fourth connection electrode 43 are arranged at intervals. The second light-emitting element 41 is electrically connected to the third connection electrode 42 and the fourth connection electrode 43. Specifically, the third connection electrode 42 and the fourth connection electrode 43 form a second electrode pair 44. A plurality of second light-emitting elements 41 are arranged in a one-to-one correspondence with a plurality of second electrode pairs 44. The second light-emitting element 41 includes a second epitaxial layer 411 and a third contact electrode 412 and a fourth contact electrode 413. The third contact electrode 412 and the fourth contact electrode 413 are electrically connected to the third connection electrode 42 and the fourth connection electrode 43 in a one-to-one correspondence. The third connection electrode 42 and the fourth connection electrode 43 are electrically connected to the first voltage line L1 and the second voltage line L2 in a one-to-one correspondence, that is, the second light-emitting element 41 of the second light-emitting unit 4 is electrically connected to both the first voltage line L1 and the second voltage line L2, and the third connection electrode 42 and the fourth connection electrode 43 of the second light-emitting unit 4 can receive the VDD signal and the VSS signal so that the second light-emitting element 41 can realize the light-emitting function, and the second light-emitting unit 4 serves as the main light-emitting unit. In some embodiments, the orthographic projection of the first light-emitting element 31 on the driving substrate 1 at least partially overlaps with the orthographic projection of the second light-emitting element 41 on the driving substrate 1.

[0058] It can be understood that in the embodiment of the present application, by setting the display panel 100 to include a plurality of stacked light-emitting unit modules 2 arranged at intervals, and each stacked light-emitting unit module 2 includes a first light-emitting unit 3 and a second light-emitting unit 4 stacked and correspondingly arranged, the first light-emitting element 31 of the first light-emitting unit 3 is electrically connected to the first connection electrode 32 and the second connection electrode 33, respectively, and the first connection electrode 32 and the second connection electrode 33 correspond to the first voltage line L1 and the second voltage line L2 one by one but are not all electrically connected, and the second light-emitting element 41 of the second light-emitting unit 4 is electrically connected to the third connection electrode 42 and the fourth connection electrode 43, respectively, and the third connection electrode 42 and the fourth connection electrode 43 are electrically connected to the first voltage line L1 and the second voltage line L2 one by one, that is, the second light-emitting element 41 is electrically connected to both the first voltage line L1 and the second voltage line L2, thereby, the second light-emitting unit 4 can be used as the main light-emitting unit, and the first light-emitting unit 4 can be used as the main light-emitting unit. As a backup light-emitting unit for the second light-emitting unit 4, when a bad pixel abnormality occurs in the second light-emitting unit 4, that is, when the second light-emitting unit 4 is an abnormal light-emitting unit, the light-emitting element of the abnormal light-emitting unit, that is, the abnormal second light-emitting element 41 is removed, and the first light-emitting unit 3 corresponding to the abnormal light-emitting unit is electrically connected to the first voltage line L1 and the second voltage line L2 respectively, so that the first connection electrode 32 and the second connection electrode 33 of the first light-emitting unit 3 corresponding to the abnormal light-emitting unit are electrically connected to the first voltage line L1 and the second voltage line L2 in a one-to-one correspondence, that is, the first light-emitting element 31 corresponding to the abnormal light-emitting unit is electrically connected to both the first voltage line L1 and the second voltage line L2, so that the first light-emitting unit 3 can receive the VDD signal and the VSS signal to realize light emission, and the first light-emitting unit 3 can be used to replace the abnormal light-emitting unit to realize normal light emission, thereby ensuring the display effect of the display panel 100.

[0059] Through the above arrangement, when the second light-emitting element 41 of the stacked light-emitting unit module 2 is abnormal, it is only necessary to change the electrical connection method between the first light-emitting element 31 and the first voltage line L1 and the second voltage line L2 to realize the light emission of the first light-emitting element 31, and to repair the abnormal light-emitting unit (bad point), and the repair method is simple and efficient. The above arrangement can not only realize the repair of the abnormal light-emitting unit, but also the repair operation is simple, and the first light-emitting unit 3 and the second light-emitting unit 4 are arranged in different layers, and the orthographic projection of the first light-emitting element 31 on the driving substrate 1 and the orthographic projection of the second light-emitting element 41 on the driving substrate 1 at least partially overlap, and the arrangement method of the first light-emitting unit 3 will not reduce the resolution of the display panel 100, and ensure the distribution density of the second light-emitting element 41 of the display panel 100, which is conducive to improving the pixel density and resolution of the display panel 100.

[0060] In some embodiments, the orthographic projection of the second light emitting element 41 of the stacked light emitting unit module 2 on the driving substrate 1 overlaps with the orthographic projection of the first light emitting element 31 on the driving substrate 1, that is, the second light emitting element 41 is located directly above the first light emitting element 31. It can be understood that the orthographic projection of the second light emitting element 41 on the driving substrate 1 is overlapped with the orthographic projection of the first light emitting element 31 on the driving substrate 1, which can avoid the influence of the second light emitting element 41 and the first light emitting element 31 on the pixel resolution of the display panel 100 when the second light emitting element 41 and the first light emitting element 31 are misaligned to the greatest extent, and better ensure that when the abnormal light emitting unit is repaired, the first light emitting element 31 corresponding to the abnormal light emitting unit can emit light normally without being blocked by the remaining second light emitting units 4, thereby improving the taste of the display panel 100.

[0061] Specifically, the second light-emitting element 41 of the second light-emitting unit 4 of each stacked light-emitting unit module 2 has the same color as the first light-emitting element 31 of the first light-emitting unit 3, ensuring that when an abnormality occurs in the second light-emitting element 41 of the stacked light-emitting unit module 2, the second light-emitting element 41 is removed and the first light-emitting element 31 is electrically connected to the first voltage line L1 and the second voltage line L2 through the first connection electrode 32 and the second connection electrode 33 in a one-to-one correspondence, the first light-emitting element 31 can emit light of the same color as the second light-emitting element 41, thereby ensuring that the display panel 100 can achieve the original normal screen display function. For example, the colors of the second light-emitting element 41 of the second light-emitting unit 4 and the first light-emitting element 31 of the first light-emitting unit 3 of the same stacked light-emitting unit module 2 are all red, or both are green, or both are blue. In other embodiments, the second light-emitting element 41 and the first light-emitting element 31 of the same stacked light-emitting unit module 2 can also be set to other colors at the same time.

[0062] In some specific embodiments, Figures 1 to 3As shown, among the first connection electrode 32 and the second connection electrode 33 of the first light-emitting unit 3 of the stacked light-emitting unit module 2, only one of the connection electrodes is electrically connected to the corresponding voltage line, and the other connection electrode is not electrically connected to the corresponding voltage line. Specifically, the first connection electrode 32 of the first light-emitting unit 3 of the stacked light-emitting unit module 2 is correspondingly arranged and electrically connected to the first voltage line L1, and the second connection electrode 33 is correspondingly arranged and not electrically connected to the second voltage line L2. Specifically, a first encapsulation layer 5 is provided on a side of the first light-emitting unit 3 away from the driving substrate 1, and the first encapsulation layer 5 covers the first light-emitting unit 3. The second light-emitting unit 4 is provided on a side of the first encapsulation layer 5 away from the first light-emitting unit 3. A first via hole 51 is provided in the first encapsulation layer 5 at a position corresponding to the first connection electrode 32 of the first light-emitting unit 3 and the third connection electrode 42 of the second light-emitting unit 4. The first via hole 51 penetrates the first encapsulation layer 5 and exposes a portion of the first connection electrode 32. The third connection electrode 42 extends into the first via hole 51 and contacts and electrically connects with the first connection electrode 32. The third connection electrode 42 realizes electrical connection with the first voltage line L1 through the first connection electrode 32. The fourth connection electrode 43 penetrates the first encapsulation layer 5 and is directly electrically connected with the second voltage line L2, so that the second light-emitting element 41 can receive the VDD signal and the VSS signal to realize light emission.

[0063] In other embodiments, the first connection electrode 32 of the first light-emitting unit 3 of the stacked light-emitting unit module 2 may be arranged corresponding to the first voltage line L1 and not electrically connected, and the second connection electrode 33 may be arranged corresponding to and electrically connected to the second voltage line L2. A first via hole 51 is arranged in the first packaging layer 5 at a position corresponding to the second connection electrode 33 of the first light-emitting unit 3 and the fourth connection electrode 43 of the second light-emitting unit 4. The first via hole 51 penetrates the first packaging layer 5 and exposes a portion of the second connection electrode 33. The fourth connection electrode 43 extends into the first via hole 51 and contacts and electrically connects with the second connection electrode 33. The fourth connection electrode 43 realizes electrical connection with the second voltage line L2 by connecting with the second connection electrode 33. The third connection electrode 42 passes through the first packaging layer 5 and is directly electrically connected with the first voltage line L1, so that the second light-emitting element 41 can receive the VDD signal and the VSS signal to realize light emission.

[0064] See also Figure 2In other embodiments, the display panel 100 further includes an independent light-emitting unit module 6, which is disposed on one side of the driving substrate 1 and is spaced apart from the stacked light-emitting unit module 2. The independent light-emitting unit module 6 includes a first light-emitting unit 3, but does not include a second light-emitting element 41, and the first connection electrode 32 and the second connection electrode 33 of the independent light-emitting unit module 6 are electrically connected to the first voltage line L1 and the second voltage line L2 in a one-to-one correspondence. That is, in this embodiment, the first light-emitting element 31 of the independent light-emitting unit module 6 is electrically connected to both the first voltage line L1 and the second voltage line L2, and the first light-emitting unit 3 of the independent light-emitting unit module 6 can receive a signal to emit light. In this embodiment, the structure of the stacked light-emitting unit module 2 is the same as the structure and electrical connection method of the stacked light-emitting unit module 2 in the first embodiment.

[0065] Specifically, in some embodiments, Figure 2 As shown, the independent light emitting unit module 6 further includes a first encapsulation layer 5, a third connection electrode 42 and a fourth connection electrode 43. The first encapsulation layer 5 covers the first light emitting unit 3, and the third connection electrode 42 and the fourth connection electrode 43 are arranged on a side of the first encapsulation layer 5 away from the driving substrate 1. Figure 4 The third connection electrode 42 and the fourth connection electrode 43 of the independent light-emitting unit module 6 are electrically connected to the first connection electrode 32 and the second connection electrode 33 one by one. The first connection electrode 32 of the independent light-emitting unit module 6 is directly arranged corresponding to and electrically connected to the first voltage line L1. The second connection electrode 33 of the independent light-emitting unit module 6 is electrically connected to the second voltage line L2 through the fourth connection electrode 43, that is, the fourth connection electrode 43 of the independent light-emitting unit module 6 is originally directly electrically connected to the second voltage line L2, and the second connection electrode 33 of the first light-emitting unit 3 of the independent light-emitting unit module 6 is electrically connected to the fourth connection electrode 43, thereby realizing electrical connection with the second voltage line L2, so that the first light-emitting unit 3 of the independent light-emitting unit module 6 is electrically connected to both the first voltage line L1 and the second voltage line L2, so as to receive the VDD signal and the VSS signal to realize light emission.

[0066] In a specific embodiment, Figure 2As shown, a second via hole 52 is provided in the first packaging layer 5 at a position corresponding to the fourth connection electrode 43 and the second connection electrode 33 of the independent light-emitting unit module 6, the second via hole 52 penetrates the first packaging layer 5 and exposes a portion of the second connection electrode 33 of the independent light-emitting unit module 6, the fourth connection electrode 43 extends into the second via hole 52 and is in contact with and electrically connected to the second connection electrode 33, or, the electrical connection between the fourth connection electrode 43 and the second connection electrode 33 of the independent light-emitting unit module 6 can be achieved by filling the second via hole 52 with a conductive paste, or, the fourth connection electrode 43 and the second connection electrode 33 of the independent light-emitting unit module 6 can be welded to each other by filling the second via hole 52 with solder and other methods to achieve electrical connection between the two.

[0067] In some embodiments, the display panel 100 in the second embodiment can actually be a new structure formed by repairing the abnormal second light-emitting unit 4 in the stacked light-emitting unit module 2 of the display panel 100 in the first embodiment, removing the light-emitting element of the abnormal light-emitting unit, and electrically connecting the first connection electrode 32 and the second connection electrode 33 of the first light-emitting unit 3 corresponding to the abnormal light-emitting unit to the first voltage line L1 and the second voltage line L2 in a one-to-one correspondence. That is, the display panel 100 in the first embodiment is a structure before the abnormal light-emitting unit is repaired, and the display panel 100 in the second embodiment is a structure after the abnormal light-emitting unit is repaired.

[0068] For details, see Figure 1 and Figure 2 In some embodiments, a second encapsulation layer 7 is further disposed on a side of the second light-emitting unit 4 away from the first light-emitting unit 3 , and the second encapsulation layer 7 covers the second light-emitting unit 4 . Taking the display panel 100 in the first embodiment as an example, if there is an abnormal light-emitting unit in the second light-emitting unit 4 of the multiple stacked light-emitting unit modules 2, when repairing the abnormal light-emitting unit, it is necessary to first remove part of the second packaging layer 7 at the corresponding position of the abnormal light-emitting unit to expose the light-emitting element of the abnormal light-emitting unit, and then dig out the light-emitting element of the abnormal light-emitting unit, and electrically connect the first connection electrode 32 and the second connection electrode 33 of the first light-emitting unit 3 corresponding to the abnormal light-emitting unit to the first voltage line L1 and the second voltage line L2 one by one. Specifically, for example, the first connection electrode 32 of the first light-emitting unit 3 corresponding to the abnormal light-emitting unit is directly electrically connected to the first voltage line L1, and by setting a second via hole 52 in the first packaging layer 5, the second connection electrode 33 of the first light-emitting unit 3 corresponding to the abnormal light-emitting unit is electrically connected to the fourth connection electrode 43 of the abnormal light-emitting unit through the second via hole 52, and then the position of the light-emitting element of the abnormal light-emitting unit and part of the second packaging layer 7 that were originally removed is filled with sealing glue, and the following can be obtained. Figure 2 The structure of the display panel 100 in the second embodiment is shown.

[0069] In other embodiments, the second encapsulation layer 7 may not be originally provided on the side of the second light-emitting unit 4 of the display panel 100 away from the second light-emitting unit 4, and the second light-emitting unit 4 may be encapsulated after the abnormal second light-emitting unit 4 of the stacked light-emitting unit module 2 is repaired, that is, the light-emitting element of the abnormal light-emitting unit is removed, and the first light-emitting unit 3 corresponding to the abnormal light-emitting unit is electrically connected to the first voltage line L1 and the second voltage line L2, so as to form the second encapsulation layer 7 on the side of the second light-emitting unit 4 away from the first light-emitting unit 3.

[0070] See also Figures 5 to 8 , Figure 5 is a schematic flow chart of an embodiment of a method for preparing a display panel provided in the present application, Figure 6 yes Figure 5 A schematic diagram of a flow chart of an implementation method of step S2 in FIG. Figure 7 yes Figure 5 A schematic diagram of a flow chart of an implementation method of step S3 in FIG. Figure 8 yes Figure 5 Schematic diagram of the process of step S4 in an implementation manner.

[0071] See also Figure 5 An embodiment of the present application provides a method for preparing a display panel 100, which is used to prepare a display panel 100. Figure 1 or Figure 2 The display panel 100 is shown.

[0072] Specifically, the method for preparing the display panel 100 may include a method for preparing the production process of the display panel 100 and a method for repairing the prepared display panel 100 .

[0073] Specifically, in some embodiments, the method for preparing the display panel 100 includes:

[0074] S1: providing a driving substrate 1.

[0075] Specifically, a driving substrate 1 is first provided, and the driving substrate 1 includes a first voltage line L1 and a second voltage line L2. Among them, one of the first voltage line L1 and the second voltage line L2 is a positive power supply voltage line, and the other is a ground voltage line. In some embodiments, the driving substrate 1 may also include a driving circuit layer and a thin film transistor layer.

[0076] S2: Prepare a first light-emitting layer on one side of the driving substrate 1; the first light-emitting layer includes a plurality of first light-emitting units 3; the first light-emitting unit 3 includes a first light-emitting element 31 and a first connecting electrode 32 and a second connecting electrode 33 spaced apart from each other, and the first light-emitting element 31 is electrically connected to the first connecting electrode 32 and the second connecting electrode 33, respectively; wherein the first connecting electrode 32 and the second connecting electrode 33 correspond one-to-one to the first voltage line L1 and the second voltage line L2 but are not all electrically connected.

[0077] Specifically, a first light-emitting layer is prepared and formed on one side of the driving substrate 1. The first light-emitting layer includes a plurality of first light-emitting units 3, each of which includes a first light-emitting element 31 and a first connection electrode 32 and a second connection electrode 33 spaced apart from each other, the first light-emitting element 31 is electrically connected to the first connection electrode 32 and the second connection electrode 33 respectively, and the first connection electrode 32 and the second connection electrode 33 correspond to the first voltage line L1 and the second voltage line L2 one by one but are not all electrically connected.

[0078] It should be noted that not all of them are electrically connected here, specifically including: one of the first connection electrode 32 and the second connection electrode 33 is electrically connected to one of the positive power supply voltage line and the ground voltage line, and the other is not electrically connected to the other of the positive power supply voltage line and the ground voltage line; or, each of the first connection electrode 32 and the second connection electrode 33 is not electrically connected to each of the positive power supply voltage line and the ground voltage line. That is, only one of the connection electrodes is electrically connected to the corresponding voltage line, and the other connection electrode is not electrically connected to the corresponding voltage line; or, both connection electrodes are not electrically connected to the corresponding voltage line. For example, the first connection electrode 32 is electrically connected to the first voltage line L1, and the second connection electrode 33 is not electrically connected to the second voltage line L2; or, the first connection electrode 32 is not electrically connected to the first voltage line L1, and the second connection electrode 33 is electrically connected to the second voltage line L2; or, the first connection electrode 32 is not electrically connected to the first voltage line L1, and the second connection electrode 33 is not electrically connected to the second voltage line L2. Since the first connecting electrode 32 and the second connecting electrode 33 of the first light-emitting unit 3 are not electrically connected to the first voltage line L1 and the second voltage line L2, the first connecting electrode 32 and the second connecting electrode 33 of the first light-emitting unit 3 cannot receive signals, and the first light-emitting element 31 cannot emit light. The first light-emitting element 31 only serves as a backup light-emitting element.

[0079] In some embodiments, Figure 6 As shown, the step of preparing the first light-emitting layer on one side of the driving substrate 1 in step S2 specifically includes:

[0080] S21: Prepare a plurality of first electrode pairs 34 spaced apart on one side of the driving substrate 1; the first electrode pairs 34 include a first connecting electrode 32 and a second connecting electrode 33; the first connecting electrode 32 is arranged corresponding to and electrically connected to the first voltage line L1, and the second connecting electrode 33 is arranged corresponding to and not electrically connected to the second voltage line L2.

[0081] Specifically, a plurality of first electrode pairs 34 are prepared on one side of the driving substrate 1, and the plurality of first electrode pairs 34 are arranged at intervals from each other. Each first electrode pair 34 includes a first connecting electrode 32 and a second connecting electrode 33, and the first connecting electrode 32 and the second connecting electrode 33 are arranged at intervals from each other.

[0082] The first connection electrode 32 and the second connection electrode 33 correspond to the first voltage line L1 and the second voltage line L2 one by one but are not electrically connected. In some embodiments, the first connection electrode 32 is arranged correspondingly and electrically connected to the first voltage line L1, and the second connection electrode 33 is arranged correspondingly and not electrically connected to the second voltage line L2.

[0083] S22: Transferring a plurality of first light-emitting elements 31 onto one side of the driving substrate 1; the first light-emitting elements 31 include a first epitaxial layer 311 and a first contact electrode 312 and a second contact electrode 313; the plurality of first light-emitting elements 31 are arranged in one-to-one correspondence with the plurality of first electrode pairs 34, and the first contact electrodes 312 and the second contact electrodes 313 are electrically connected to the first connection electrodes 32 and the second connection electrodes 33 in one-to-one correspondence.

[0084] Specifically, a plurality of first light-emitting elements 31 are transferred on one side of the driving substrate 1, and the plurality of first light-emitting elements 31 are arranged in one-to-one correspondence with the plurality of first electrode pairs 34. The first light-emitting element 31 includes a first epitaxial layer 311 and a first contact electrode 312 and a second contact electrode 313, and the first contact electrodes 312 and the second contact electrodes 313 of the plurality of first light-emitting elements 31 are electrically connected to the first connection electrodes 32 and the second connection electrodes 33 on one side of the driving substrate 1 in one-to-one correspondence.

[0085] Since the first connection electrode 32 is arranged corresponding to and electrically connected to the first voltage line L1, the second connection electrode 33 is arranged corresponding to and not electrically connected to the second voltage line L2, and the first contact electrode 312 and the second contact electrode 313 of the first light-emitting element 31 are electrically connected to the first connection electrode 32 and the second connection electrode 33 on one side of the driving substrate 1 in a one-to-one correspondence, the first light-emitting element 31 is electrically connected to the first voltage line L1 and not electrically connected to the second voltage line L2. In this step, the first light-emitting element 31 cannot receive the VDD signal and the VSS signal, cannot emit light, and only serves as a backup light-emitting element.

[0086] S23 : preparing a first encapsulation layer 5 on a side of the plurality of first light emitting elements 31 away from the driving substrate 1 , and forming a first via hole 51 in the first encapsulation layer 5 that penetrates the first encapsulation layer 5 and exposes the first connection electrode 32 .

[0087] Specifically, in some embodiments, a first encapsulation layer 5 is prepared on a side of the plurality of first light-emitting elements 31 away from the driving substrate 1 to encapsulate and protect the plurality of first light-emitting elements 31. Then, a first via hole 51 is formed in the first encapsulation layer 5 to penetrate the first encapsulation layer 5 and expose the first connection electrode 32. Specifically, the first via hole 51 is arranged corresponding to the position of the first connection electrode 32, so that part of the first connection electrode 32 is exposed by the first via hole 51.

[0088] S3: Prepare a second light-emitting layer on a side of the first light-emitting layer away from the driving substrate 1; the second light-emitting layer includes a plurality of second light-emitting units 4, and the plurality of second light-emitting units 4 correspond one-to-one to the plurality of first light-emitting units 3; the second light-emitting unit 4 includes a second light-emitting element 41 and a third connecting electrode 42 and a fourth connecting electrode 43 spaced apart from each other, and the second light-emitting element 41 is electrically connected to the third connecting electrode 42 and the fourth connecting electrode 43, respectively; wherein the third connecting electrode 42 and the fourth connecting electrode 43 are electrically connected to the first voltage line L1 and the second voltage line L2 one-to-one.

[0089] Specifically, a second light-emitting layer is prepared on a side of the first light-emitting layer away from the driving substrate 1, and the second light-emitting layer includes a plurality of second light-emitting units 4, and the plurality of second light-emitting units 4 are arranged in a one-to-one correspondence with the plurality of first light-emitting units 3 of the first light-emitting layer. Specifically, in some embodiments, the second light-emitting unit 4 at least partially overlaps with the projection of the corresponding first light-emitting unit 3. It can be understood that the second light-emitting unit 4 is arranged at least partially overlapping with the projection of the corresponding first light-emitting unit 3, and the arrangement of the first light-emitting unit 3 does not reduce the resolution of the display panel 100 formed, and ensures the distribution density of the second light-emitting elements 41 of the display panel 100 formed, which is conducive to improving the pixel density and resolution of the display panel 100 formed.

[0090] Specifically, the second light-emitting unit 4 includes a second light-emitting element 41 and a third connection electrode 42 and a fourth connection electrode 43 that are spaced apart from each other, and the second light-emitting element 41 is electrically connected to the third connection electrode 42 and the fourth connection electrode 43. The third connection electrode 42 and the fourth connection electrode 43 are electrically connected to the first voltage line L1 and the second voltage line L2 in a one-to-one correspondence.

[0091] Since the third connection electrode 42 and the fourth connection electrode 43 are electrically connected to the first voltage line L1 and the second voltage line L2 in a one-to-one correspondence, and the second light-emitting element 41 is electrically connected to the third connection electrode 42 and the fourth connection electrode 43, respectively, the second light-emitting element 41 is electrically connected to both the first voltage line L1 and the second voltage line L2, the second light-emitting element 41 can receive the VDD signal and the VSS signal at the same time, and the second light-emitting element 41 can emit light to serve as the main light-emitting element.

[0092] In some embodiments, Figure 7 As shown, the step of preparing the second light-emitting layer on the side of the first light-emitting layer away from the driving substrate 1 in step S3 specifically includes:

[0093] S31: Prepare a plurality of second electrode pairs 44 spaced apart on a side of the first packaging layer 5 away from the driving substrate 1; the second electrode pair 44 includes a third connecting electrode 42 and a fourth connecting electrode 43; the third connecting electrode 42 is electrically connected to the first connecting electrode 32 through a first via 51; the orthographic projection of the fourth connecting electrode 43 on the driving substrate 1 partially overlaps with the orthographic projection of the second connecting electrode 33 on the driving substrate 1 to form an overlapping area.

[0094] Specifically, a plurality of second electrode pairs 44 are prepared on a side of the first packaging layer 5 away from the driving substrate 1, and the plurality of second electrode pairs 44 are spaced apart from each other. Specifically, the second electrode pairs 44 include a third connecting electrode 42 and a fourth connecting electrode 43 spaced apart from each other, and the third connecting electrode 42 and the fourth connecting electrode 43 are electrically connected to the first voltage line L1 and the second voltage line L2 one by one.

[0095] In some embodiments, the third connection electrode 42 is electrically connected to the first connection electrode 32 through the first via hole 51 in the first packaging layer 5. Specifically, one end of the third connection electrode 42 extends into the first via hole 51 and is in contact with and electrically connected to the first connection electrode 32. That is, the first connection electrode 32 is electrically connected to the first voltage line L1, and the third connection electrode 42 is electrically connected to the first voltage line L1 through the via hole connected to the first connection electrode 32. In some embodiments, the fourth connection electrode 43 is directly electrically connected to the second voltage line L2. In this step, the second connection electrode 33 is not electrically connected to the fourth connection electrode 43.

[0096] In some embodiments, the orthographic projection of the fourth connection electrode 43 on the driving substrate 1 partially overlaps with the orthographic projection of the second connection electrode 33 on the driving substrate 1 to form an overlapping area. In some specific embodiments, a plurality of second electrode pairs 44 are arranged in one-to-one correspondence with a plurality of first electrode pairs 34, the third connection electrode 42 is arranged corresponding to the first connection electrode 32, and the fourth connection electrode 43 is arranged corresponding to the second connection electrode 33. It can be understood that the orthographic projection of the fourth connection electrode 43 on the driving substrate 1 is partially overlapped with the orthographic projection of the second connection electrode 33 on the driving substrate 1 to form an overlapping area. When the second light-emitting element 41 of the abnormal light-emitting unit needs to be repaired in the subsequent steps, it is convenient to realize the electrical connection between the fourth connection electrode 43 and the second connection electrode 33, thereby facilitating the electrical connection between the second connection electrode 33 and the second voltage line L2, so as to realize the use of the first light-emitting unit 3 to replace the abnormal light-emitting unit to realize light emission, and complete the repair of the abnormal light-emitting unit.

[0097] S32: Transferring a plurality of second light-emitting elements 41 on a side of the first packaging layer 5 away from the driving substrate 1; the second light-emitting elements 41 include a second epitaxial layer 411 and a third contact electrode 412 and a fourth contact electrode 413; the plurality of second light-emitting elements 41 are arranged in one-to-one correspondence with the plurality of second electrode pairs 44, and the third contact electrode 412 and the fourth contact electrode 413 are electrically connected to the third connection electrode 42 and the fourth connection electrode 43 in one-to-one correspondence.

[0098] Specifically, after the preparation of the plurality of second electrode pairs 44, the plurality of second light-emitting elements 41 are transferred on the side of the first encapsulation layer 5 away from the driving substrate 1, and the plurality of second light-emitting elements 41 are arranged one-to-one with the plurality of second electrode pairs 44. Specifically, the second light-emitting element 41 includes a second epitaxial layer 411 and a third contact electrode 412 and a fourth contact electrode 413, the third contact electrode 412 and the fourth contact electrode 413 are arranged at intervals, and the third contact electrode 412 and the fourth contact electrode 413 are electrically connected to the third connection electrode 42 and the fourth connection electrode 43 one-to-one. In a specific embodiment, the third contact electrode 412 is electrically connected to the third connection electrode 42, and the fourth contact electrode 413 is electrically connected to the fourth connection electrode 43, so that the second light-emitting element 41 is electrically connected to the third connection electrode 42 and the fourth connection electrode 43, thereby realizing the electrical connection of the second light-emitting element 41 with the first voltage line L1 and the second voltage line L2, so that the second light-emitting element 41 can emit light.

[0099] Specifically, the multiple second light-emitting units 4 in the second light-emitting layer are arranged in a one-to-one correspondence with the multiple first light-emitting units 3, and the second light-emitting element 41 has the same color as the corresponding first light-emitting element 31, so that when an abnormality occurs in the second light-emitting element 41 and the abnormal light-emitting unit is repaired, the first light-emitting element 31 of the first light-emitting unit 3 corresponding to the abnormal light-emitting unit can emit light of the same color as the abnormal light-emitting unit, thereby ensuring the repair effect of the abnormal light-emitting unit and the display effect of the display panel 100.

[0100] In some embodiments, the orthographic projections of the plurality of second light-emitting elements 41 on the driving substrate 1 overlap with the orthographic projections of the plurality of first light-emitting elements 31 on the driving substrate 1. That is, the second light-emitting element 41 is located directly above the first light-emitting element 31. It can be understood that by arranging the orthographic projections of the second light-emitting element 41 on the driving substrate 1 to overlap with the orthographic projections of the first light-emitting element 31 on the driving substrate 1, the influence on the pixel resolution of the display panel 100 when the second light-emitting element 41 and the first light-emitting element 31 are misaligned can be avoided to the greatest extent, and the first light-emitting element 31 corresponding to the abnormal light-emitting unit can be better guaranteed to emit light normally without being blocked by the remaining second light-emitting units 4 when the abnormal light-emitting unit is repaired, thereby improving the taste of the display panel 100.

[0101] S33 : preparing a second encapsulation layer 7 on a side of the plurality of second light emitting elements 41 away from the driving substrate 1 .

[0102] Specifically, in some embodiments, after the second light-emitting layer is prepared, a second encapsulation layer 7 is prepared on a side of the plurality of second light-emitting elements 41 away from the driving substrate 1 , and the second encapsulation layer 7 covers the plurality of second light-emitting units 4 to encapsulate and protect the second light-emitting units 4 .

[0103] Specifically, in some embodiments, steps S1 to S3 in the method for preparing the display panel 100 are the method for preparing the production process of the display panel 100 .

[0104] In one embodiment, after step S33, the following can be prepared: Figure 1 The structure of the display panel 100 is shown.

[0105] Furthermore, the method for preparing the display panel 100 also includes a method for repairing the display panel 100 prepared by the method for preparing the display panel 100 production process using steps S1 to S3. Specifically, the method for preparing the display panel 100 also includes:

[0106] S4: Detect whether there is an abnormal light-emitting unit among the multiple second light-emitting units 4; if there is an abnormal light-emitting unit, remove the light-emitting element of the abnormal light-emitting unit, and electrically connect the first light-emitting unit 3 corresponding to the abnormal light-emitting unit to the first voltage line L1 and the second voltage line L2, so that the first connecting electrode 32 and the second connecting electrode 33 of the first light-emitting unit 3 corresponding to the abnormal light-emitting unit are electrically connected to the first voltage line L1 and the second voltage line L2 one by one.

[0107] Specifically, it is detected whether there is an abnormal light-emitting unit among the multiple second light-emitting units 4. If it is detected that there is an abnormal light-emitting unit among the multiple second light-emitting units 4, the light-emitting element of the abnormal light-emitting unit is removed, that is, the abnormal second light-emitting element 41 is removed, and the first light-emitting unit 3 corresponding to the abnormal light-emitting unit is electrically connected to the first voltage line L1 and the second voltage line L2, so that the first light-emitting unit 3 corresponding to the abnormal light-emitting unit can receive the VDD signal and the VSS signal to be able to emit light normally, and the first light-emitting unit 3 corresponding to the abnormal light-emitting unit is used to replace the abnormal light-emitting unit to emit light, so as to repair the abnormal light-emitting unit (bad point).

[0108] In some embodiments, Figure 8 As shown, the step of removing the light-emitting element of the abnormal light-emitting unit and electrically connecting the first light-emitting unit 3 corresponding to the abnormal light-emitting unit to the first voltage line L1 and the second voltage line L2 in step S4 specifically includes:

[0109] S41: removing the light emitting element of the abnormal light emitting unit, and retaining the fourth connection electrode 43 of the abnormal light emitting unit.

[0110] Specifically, after detecting that there is an abnormal light-emitting unit among multiple second light-emitting units 4, the light-emitting element of the abnormal light-emitting unit is removed, that is, the second light-emitting element 41 of the abnormal second light-emitting unit 4 is removed, and the fourth connecting electrode 43 of the abnormal second light-emitting unit 4 is retained, and the fourth connecting electrode 43 is electrically connected to the second voltage line L2.

[0111] In a specific embodiment, the third connection electrode 42 is electrically connected to the first connection electrode 32 through the first via 51, and the third connection electrode 42 is electrically connected to the first voltage line L1. The fourth connection electrode 43 and the third connection electrode 42 of the abnormal light-emitting unit may also be retained at the same time.

[0112] Specifically, when removing the light-emitting element of the abnormal light-emitting unit, it is necessary to first remove a portion of the second encapsulation layer 7 corresponding to the abnormal light-emitting unit, so that the light-emitting element of the abnormal light-emitting unit is exposed.

[0113] S42 : forming a second via hole 52 penetrating the first encapsulation layer 5 and exposing the second connection electrode 33 in the first encapsulation layer 5 corresponding to the overlapping region.

[0114] Specifically, a second via hole 52 is formed in the first encapsulation layer 5, and the second via hole 52 penetrates the first encapsulation layer 5 and exposes the second connection electrode 33. Specifically, the orthographic projection of the fourth connection electrode 43 on the drive substrate 1 partially overlaps with the orthographic projection of the second connection electrode 33 on the drive substrate 1 to form an overlapping area, and the second via hole 52 is arranged corresponding to the overlapping area to facilitate the subsequent electrical connection between the second connection electrode 33 and the fourth connection electrode 43.

[0115] S43 : electrically connecting the fourth connection electrode 43 to the second connection electrode 33 through the second via hole 52 .

[0116] Specifically, the fourth connection electrode 43 is electrically connected to the second connection electrode 33 through the second via hole 52, wherein the electrical connection between the fourth connection electrode 43 and the second connection electrode 33 can be achieved by filling a conductive paste in the second via hole 52, or by filling solder in the second via hole 52 and welding the fourth connection electrode 43 to the second connection electrode 33 to achieve electrical connection between the two.

[0117] Since the fourth connection electrode 43 is electrically connected to the second voltage line L2, and the second connection electrode 33 is not originally electrically connected to the second voltage line L2, the fourth connection electrode 43 is electrically connected to the second connection electrode 33 through the second via 52, so that the second connection electrode 33 and the second voltage line L2 can be electrically connected, so that the first light-emitting unit 3 corresponding to the abnormal light-emitting unit can be electrically connected to both the second voltage line L2 and the first voltage line L1, so that the first light-emitting unit 3 can receive the VDD signal and the VSS signal at the same time to realize light emission, so as to utilize the first light-emitting unit 3 to replace the abnormal light-emitting unit to emit light, thereby realizing repair of the abnormal light-emitting unit, without affecting the display effect of the display panel 100, and without affecting the resolution and display taste of the display panel 100.

[0118] Specifically, in some embodiments, after the fourth connecting electrode 43 is electrically connected to the second connecting electrode 33 in step S43, it is also necessary to fill the portion of the second encapsulation layer 7 at the position of the light-emitting element of the removed abnormal light-emitting unit with a sealing glue so that the second encapsulation layer 7 can protect the second light-emitting unit 4.

[0119] Specifically, in some embodiments, the detection of whether there is an abnormal light-emitting unit among the multiple second light-emitting units 4 in step S4 occurs after the second encapsulation layer 7 is prepared in step S33, so as to repair the abnormalities (bad points) that appear in the subsequent use of the display panel 100 formed by production. Step S4 is a method for repairing the prepared display panel 100, that is, a method for repairing the abnormalities that exist in the display panel 100 formed by production when the user uses the display panel 100. The repair method of step S4 has great advantages for repairing abnormalities of the display panel 100 formed by production during use. It only needs to remove the abnormal light-emitting unit and electrically connect the first light-emitting unit 3 corresponding to the abnormal light-emitting unit to the first voltage line L1 and the second voltage line L2 to achieve the repair of the abnormal light-emitting unit. The repair method is simple and efficient.

[0120] In some implementations, after step S43, the following can be obtained: Figure 2 The display panel 100 structure shown in FIG. Figure 1 After the display panel 100 shown in FIG. 1 is repaired, the display panel 100 shown in FIG. 1 can be repaired. Figure 2 The display panel 100 is shown.

[0121] In other embodiments, step S3 may not include preparing the second encapsulation layer 7 on the side of the plurality of second light-emitting elements 41 away from the driving substrate 1 as described in step S33. In step S4, it is detected whether there is an abnormal light-emitting unit among the plurality of second light-emitting units 4. If there is an abnormal light-emitting unit, the light-emitting element of the abnormal light-emitting unit can be removed, and a new second light-emitting element 41 can be directly transferred to the position of the light-emitting element of the removed abnormal light-emitting unit, so that the re-transferred new second light-emitting element 41 can be electrically connected to both the first voltage line L1 and the second voltage line L2 to achieve light emission, and the transferred new second light-emitting element 41 is directly used to replace the light-emitting element of the abnormal light-emitting unit to emit light. In step S4, the electrical connection mode between the first light-emitting unit 3 corresponding to the abnormal light-emitting unit and the first voltage line L1 and the second voltage line L2 remains unchanged, that is, the first light-emitting unit 3 corresponding to the abnormal light-emitting unit is still not electrically connected to both the first voltage line L1 and the second voltage line L2. In this step, the first light-emitting element 31 is still a spare light-emitting element and still does not emit light. That is, step S4 can also be a method for repairing an abnormal second light-emitting unit 4 during the production and preparation process of the display panel 100, thereby ensuring that each second light-emitting unit 4 in the second light-emitting layer during the production and preparation process of the display panel 100 can normally realize the light-emitting function, avoiding the problem that the second light-emitting unit 4 during the production and preparation process of the display panel 100 cannot emit light normally due to abnormality, thereby improving the production yield and display effect of the display panel 100. After the new second light-emitting element 41 is re-transferred to repair the abnormal light-emitting unit, a second encapsulation layer 7 is further prepared on the side of the second light-emitting unit 4 away from the driving substrate 1, and the second encapsulation layer 7 is used to encapsulate and protect multiple second light-emitting units 4 to prepare a structure such as Figure 1 The structure of the display panel 100 is shown.

[0122] Furthermore, if the second light-emitting unit 4 has an abnormality during the subsequent use of the prepared display panel 100, the display panel 100 can still be repaired in the original step S4, that is, by removing the light-emitting element of the abnormal light-emitting unit, so that the first light-emitting unit 3 corresponding to the abnormal light-emitting unit is electrically connected to the first voltage line L1 and the second voltage line L2, and the first light-emitting unit 3 is used to replace the abnormal light-emitting unit to emit light, thereby repairing the abnormal light-emitting unit.

[0123] In other embodiments, step S3 may not include preparing the second encapsulation layer 7 on the side of the plurality of second light-emitting elements 41 away from the driving substrate 1 as described in step S33. In step S4, it may be detected whether there is an abnormal light-emitting unit among the plurality of second light-emitting units 4. After the abnormal light-emitting unit is repaired, the light-emitting element of the abnormal light-emitting unit is removed, and the first light-emitting unit 3 corresponding to the abnormal light-emitting unit is electrically connected to the first voltage line L1 and the second voltage line L2, the second encapsulation layer 7 is prepared on the side of the second light-emitting element 41 away from the driving substrate 1. That is, the plurality of second light-emitting units 4 may be detected before the second encapsulation layer 7 is prepared, so that the abnormal light-emitting unit may be repaired directly before the second light-emitting unit 4 is encapsulated during the production and preparation process of the display panel 100, and the first light-emitting unit 3 corresponding to the abnormal light-emitting unit may be directly used to replace the abnormal light-emitting unit for light emission, so as to avoid the problem that the second light-emitting unit 4 becomes abnormal and cannot emit light normally during the production and preparation process of the display panel 100, thereby improving the performance of the prepared display panel 100. In this embodiment, when the display panel 100 is produced, the following may be directly obtained. Figure 2 The structure of the display panel 100 is shown.

[0124] The display panel 100 prepared by the method for preparing the display panel 100 provided in the embodiment of the present application can repair abnormal light-emitting units of the display panel 100 without affecting the resolution of the display panel 100. The display panel 100 has good quality and can effectively solve the problem of difficulty in repairing bad pixels of the Micro LED display panel 100 in the prior art.

[0125] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A display panel, characterized in that: include: Driver substrate; The driving substrate comprises a first voltage line and a second voltage line; wherein one of the first voltage line and the second voltage line is a positive power supply voltage line, and the other is a ground voltage line; A plurality of stacked light-emitting unit modules arranged at intervals are arranged on one side of the driving substrate; the stacked light-emitting unit module comprises a first light-emitting unit and a second light-emitting unit which are stacked and correspondingly arranged; The first light-emitting unit includes a first light-emitting element and a first connecting electrode and a second connecting electrode arranged at intervals, the first light-emitting element is electrically connected to the first connecting electrode and the second connecting electrode respectively; the first connecting electrode and the second connecting electrode correspond to the first voltage line and the second voltage line one by one but are not all electrically connected; The second light-emitting unit is arranged on a side of the first light-emitting unit away from the substrate, the second light-emitting unit includes a second light-emitting element and a third connecting electrode and a fourth connecting electrode arranged at intervals, the second light-emitting element is electrically connected to the third connecting electrode and the fourth connecting electrode respectively, the third connecting electrode and the fourth connecting electrode are electrically connected to the first voltage line and the second voltage line in a one-to-one correspondence; the orthographic projection of the first light-emitting element on the driving substrate at least partially overlaps with the orthographic projection of the second light-emitting element on the driving substrate.

2. The display panel according to claim 1, characterized in that: The first connection electrode of the stacked light-emitting unit module is disposed correspondingly to and electrically connected to the first voltage line, and the second connection electrode is disposed correspondingly to and not electrically connected to the second voltage line.

3. The display panel according to claim 2, characterized in that: Also includes: An independent light-emitting unit module is arranged on one side of the driving substrate and is spaced apart from the stacked light-emitting unit module; The independent light-emitting unit module includes the first light-emitting unit but does not include the second light-emitting element; The first connection electrode and the second connection electrode of the independent light-emitting unit module are electrically connected to the first voltage line and the second voltage line in a one-to-one correspondence.

4. The display panel according to claim 3, characterized in that: The independent light emitting unit module also includes: A first encapsulation layer, covering the first light-emitting unit; and The third connecting electrode and the fourth connecting electrode are arranged on a side of the first packaging layer away from the driving substrate; the third connecting electrode and the fourth connecting electrode of the independent light-emitting unit module are electrically connected to the first connecting electrode and the second connecting electrode one by one; the first connecting electrode of the independent light-emitting unit module is directly arranged corresponding to and electrically connected to the first voltage line, and the second connecting electrode of the independent light-emitting unit module is electrically connected to the second voltage line through the fourth connecting electrode.

5. The display panel according to any one of claims 1 to 4, characterized in that: The orthographic projection of the second light emitting element of the stacked light emitting unit module on the driving substrate overlaps with the orthographic projection of the first light emitting element on the driving substrate.

6. A method for preparing a display panel, characterized in that: include: Providing a drive substrate; The driving substrate comprises a first voltage line and a second voltage line; wherein one of the first voltage line and the second voltage line is a positive power supply voltage line, and the other is a ground voltage line; A first light-emitting layer is prepared on one side of the driving substrate; the first light-emitting layer includes a plurality of first light-emitting units; the first light-emitting unit includes a first light-emitting element and a first connecting electrode and a second connecting electrode spaced apart from each other, the first light-emitting element is electrically connected to the first connecting electrode and the second connecting electrode respectively; wherein the first connecting electrode and the second connecting electrode correspond to the first voltage line and the second voltage line one by one but are not all electrically connected; A second light-emitting layer is prepared on a side of the first light-emitting layer away from the driving substrate; the second light-emitting layer includes a plurality of second light-emitting units, and the plurality of second light-emitting units correspond to the plurality of first light-emitting units one by one; the second light-emitting unit includes a second light-emitting element and a third connection electrode and a fourth connection electrode spaced apart from each other, and the second light-emitting element is electrically connected to the third connection electrode and the fourth connection electrode respectively; wherein the third connection electrode and the fourth connection electrode are electrically connected to the first voltage line and the second voltage line one by one; Detect whether there is an abnormal light-emitting unit among the multiple second light-emitting units; if there is an abnormal light-emitting unit, remove the light-emitting element of the abnormal light-emitting unit, and electrically connect the first light-emitting unit corresponding to the abnormal light-emitting unit to the first voltage line and the second voltage line, so that the first connecting electrode and the second connecting electrode of the first light-emitting unit corresponding to the abnormal light-emitting unit are electrically connected to the first voltage line and the second voltage line one by one.

7. The method for preparing a display panel according to claim 6, characterized in that: The step of preparing the first light-emitting layer on the side of the driving substrate specifically includes: A plurality of first electrode pairs are provided at intervals on one side of the driving substrate; the first electrode pairs include the first connecting electrode and the second connecting electrode; the first connecting electrode is provided corresponding to and electrically connected to the first voltage line, and the second connecting electrode is provided corresponding to and not electrically connected to the second voltage line; A plurality of the first light-emitting elements are transferred on one side of the driving substrate; the first light-emitting elements include a first epitaxial layer and a first contact electrode and a second contact electrode; the plurality of the first light-emitting elements are arranged in a one-to-one correspondence with the plurality of the first electrode pairs, and the first contact electrode and the second contact electrode are electrically connected to the first connection electrode and the second connection electrode in a one-to-one correspondence; A first encapsulation layer is prepared on a side of the plurality of first light emitting elements away from the driving substrate, and a first via hole is formed in the first encapsulation layer that penetrates the first encapsulation layer and exposes the first connecting electrode.

8. The method for preparing a display panel according to claim 7, characterized in that: The step of preparing the second light-emitting layer on a side of the first light-emitting layer away from the driving substrate specifically includes: A plurality of second electrode pairs are provided at intervals on a side of the first encapsulation layer away from the drive substrate; the second electrode pairs include the third connection electrode and the fourth connection electrode; the third connection electrode is electrically connected to the first connection electrode through the first via hole; the orthographic projection of the fourth connection electrode on the drive substrate partially overlaps with the orthographic projection of the second connection electrode on the drive substrate to form an overlapping area; A plurality of second light-emitting elements are transferred on a side of the first encapsulation layer away from the drive substrate; the second light-emitting elements include a second epitaxial layer and a third contact electrode and a fourth contact electrode; the plurality of second light-emitting elements are arranged in one-to-one correspondence with the plurality of second electrode pairs, and the third contact electrode and the fourth contact electrode are electrically connected to the third connection electrode and the fourth connection electrode in one-to-one correspondence; A second encapsulation layer is prepared on a side of the plurality of second light emitting elements away from the driving substrate.

9. The method for preparing a display panel according to claim 8, characterized in that: The step of removing the light emitting element of the abnormal light emitting unit and electrically connecting the first light emitting unit corresponding to the abnormal light emitting unit to the first voltage line and the second voltage line specifically includes: removing the light emitting element of the abnormal light emitting unit and retaining the fourth connecting electrode of the abnormal light emitting unit; forming a second via hole penetrating through the first encapsulation layer and exposing the second connection electrode in the first encapsulation layer corresponding to the overlapping area; The fourth connection electrode is electrically connected to the second connection electrode through the second via hole.

10. The method for preparing a display panel according to any one of claims 6 to 9, characterized in that: The orthographic projections of the plurality of second light emitting elements on the drive substrate overlap with the orthographic projections of the plurality of first light emitting elements on the drive substrate.

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