Display panel and preparation method thereof

Abstract

The application discloses a display panel and a preparation method thereof. The display panel comprises a driving substrate, a plurality of spaced stacked light emitting unit modules, and a first voltage line and a second voltage line. The plurality of spaced stacked light emitting unit modules are arranged on one side of the driving substrate and comprise stacked and corresponding first light emitting units and second light emitting units. The first light emitting units comprise first light emitting elements and spaced first connecting electrodes and second connecting electrodes. The first connecting electrodes and the second connecting electrodes correspond to the first voltage line and the second voltage line one by one but are not all electrically connected. The second light emitting units are arranged on one side of the first light emitting units and comprise second light emitting elements and spaced third connecting electrodes and fourth connecting electrodes. The third connecting electrodes and the fourth connecting electrodes correspond to the first voltage line and the second voltage line one by one and are electrically connected. The orthographic projection of the first light emitting elements and the second light emitting elements on the driving substrate at least partially overlaps. Through the above arrangement, the problem of difficult repair of a bad point of a display panel in the prior art can be solved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display panel and a method for manufacturing the same. Background Technology

[0002] Micro LED (micro-light-emitting diode) is an emerging display technology and is considered one of the strong contenders for next-generation display technologies. With its advantages of high brightness, high contrast, low power consumption, fast response time, long lifespan, 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 existing technology, the mass transfer technology of Micro LED display panels has a low yield, and Micro LED display panels have the problem of difficult defect repair, and defect repair can easily affect the resolution of the display panel. Summary of the Invention

[0004] This application provides a display panel and its manufacturing method to solve the problem of difficult repair of dead pixels in Micro LED display panels in the prior art.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: to provide a display panel, comprising:

[0006] A driving substrate; the driving substrate includes 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] Multiple stacked light-emitting unit modules arranged at intervals are disposed on one side of the driving substrate; the stacked light-emitting unit module includes a first light-emitting unit and a second light-emitting unit stacked and correspondingly arranged;

[0008] 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 one-to-one with the first voltage line and the second voltage line, but are not all electrically connected.

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

[0010] In some embodiments, the first connecting electrode of the laminated light emitting unit module is arranged and electrically connected with the first voltage line in correspondence, and the second connecting electrode is arranged with the second voltage line in correspondence and is not electrically connected.

[0011] In some embodiments, further comprising:

[0012] A separate light emitting unit module is arranged on the side of the driving substrate and arranged at intervals with the laminated light emitting unit module; the separate light emitting unit module includes the first light emitting unit but does not include the second light emitting element;

[0013] The first connecting electrode and the second connecting electrode of the separate light emitting unit module are electrically connected with the first voltage line and the second voltage line one by one.

[0014] In some embodiments, the separate light emitting unit module further comprises:

[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 the side of the first encapsulation layer away from the driving substrate; the third connecting electrode and the fourth connecting electrode of the separate light emitting unit module are electrically connected with the first connecting electrode and the second connecting electrode one by one; the first connecting electrode of the separate light emitting unit module is arranged and electrically connected with the first voltage line in correspondence, and the second connecting electrode of the separate light emitting unit module is electrically connected with the second voltage line through the fourth connecting electrode.

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

[0018] To solve the above technical problems, another technical scheme adopted by the present application is to provide a preparation method of 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 voltage line, and the other is a ground voltage line;

[0020] A first light-emitting layer is prepared on a side of the driving substrate; the first light-emitting layer comprises a plurality of first light-emitting units; the first light-emitting unit comprises a first light-emitting element, and a first connecting electrode and a second connecting electrode spaced from each other, and the first light-emitting element is electrically connected with 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 comprises 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 comprises a second light-emitting element, and a third connecting electrode and a fourth connecting electrode spaced from each other, and the second light-emitting element is electrically connected with the third connecting electrode and the fourth connecting electrode respectively; wherein the third connecting electrode and the fourth connecting electrode are electrically connected with the first voltage line and the second voltage line one by one;

[0022] It is detected whether there is an abnormal light-emitting unit in the plurality of second light-emitting units; if there is an abnormal light-emitting unit, the light-emitting element of the abnormal light-emitting unit is removed, and the first light-emitting unit corresponding to the abnormal light-emitting unit is electrically connected with 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 with the first voltage line and the second voltage line one by one.

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

[0024] A plurality of first electrode pairs are prepared on a side of the driving substrate; the first electrode pair comprises the first connecting electrode and the second connecting electrode; the first connecting electrode is arranged corresponding to the first voltage line and is electrically connected, and the second connecting electrode is arranged corresponding to the second voltage line and is not electrically connected;

[0025] A plurality of first light-emitting elements are transferred on a side of the driving substrate; the first light-emitting element comprises a first epitaxial layer, and a first contact electrode and a second contact electrode; the plurality of first light-emitting elements are arranged corresponding to the plurality of first electrode pairs one by one, and the first contact electrode and the second contact electrode are electrically connected with the first connecting electrode and the second connecting electrode one by one;

[0026] A first encapsulation layer is prepared on a side of the first light emitting elements away from the driving substrate, and a first via is formed in the first encapsulation layer, the first via penetrating through the first encapsulation layer and exposing the first connection 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 comprises:

[0028] A plurality of second electrode pairs are prepared on a side of the first encapsulation layer away from the driving substrate, the second electrode pairs comprising the third connection electrode and the fourth connection electrode, the third connection electrode being electrically connected to the first connection electrode through the first via, and a projection of the fourth connection electrode on the driving substrate partially overlapping with a projection of the second connection electrode on the driving substrate to form an overlapping area;

[0029] A plurality of the second light emitting elements are transferred on a side of the first encapsulation layer away from the driving substrate, the second light emitting elements comprising a second epitaxial layer, a third contact electrode and a fourth contact electrode, the plurality of the second light emitting elements being arranged in one-to-one correspondence with the plurality of the second electrode pairs, and the third contact electrode and the fourth contact electrode being 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 the 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 comprises:

[0032] The light emitting element of the abnormal light emitting unit is removed, and the fourth connection electrode of the abnormal light emitting unit is retained;

[0033] A second via is formed in the first encapsulation layer corresponding to the overlapping area, the second via penetrating through the first encapsulation layer and exposing the second connection electrode;

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

[0035] In some embodiments, a projection of the plurality of the second light emitting elements on the driving substrate overlaps with a projection of the plurality of the first light emitting elements on the driving substrate.

[0036] The beneficial effects of the present application are: different from the prior art, the present application discloses a display panel and a preparation method thereof, the display panel comprises a driving substrate and a plurality of spaced stacked light emitting unit modules; 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 voltage line, and the other is a ground voltage line; a plurality of spaced stacked light emitting unit modules are arranged on one side of the driving substrate, and the stacked light emitting unit module comprises a first light emitting unit and a second light emitting unit arranged correspondingly, wherein the first light emitting unit comprises a first light emitting element, a first connecting electrode and a second connecting electrode arranged at intervals, and the first light emitting element is electrically connected with 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 the side of the first light emitting unit away from the substrate, and the second light emitting unit comprises a second light emitting element, a third connecting electrode and a fourth connecting electrode arranged at intervals, the second light emitting element is electrically connected with the third connecting electrode and the fourth connecting electrode respectively, the third connecting electrode and the fourth connecting electrode are electrically connected with 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 and the orthographic projection of the second light emitting element on the driving substrate at least partially overlap. Through the above arrangement, the problem of difficult repair of bad points in the Micro LED display panel in the prior art can be effectively solved, and the resolution of the display panel will not be affected. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

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

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

[0040] Figure 3 is Figure 1 a schematic diagram of an electrical connection mode of a stacked light emitting unit module of a display panel provided by the present application;

[0041] Figure 4 is Figure 2 a schematic diagram of an electrical connection mode of an independent light emitting unit module of a display panel provided by the present application;

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

[0043] Figure 6 is Figure 5 is a flowchart of an embodiment of step S2 in the method for manufacturing a display panel provided in the present application;

[0044] Figure 7 is Figure 5 is a flowchart of an embodiment of step S3 in the method for manufacturing a display panel provided in the present application;

[0045] Figure 8 is Figure 5 is a flowchart of an embodiment of step S4 in the method for manufacturing a display panel provided in the present application.

[0046] Reference Signs:

[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 connection electrode 32; second connection 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 connection electrode 42; fourth connection electrode 43; second electrode pair 44; first encapsulation layer 5; first via hole 51; second via hole 52; independent light emitting unit module 6; second encapsulation layer 7. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0049] The terms "first", "second", "third" in the embodiments of the present application are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0050] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in

[0051] Referring to Figure 1 to Figure 4 , Figure 1 is a structural schematic diagram of a first embodiment of a display panel provided by the application, Figure 2 is a structural schematic diagram of a second embodiment of a display panel provided by the application, Figure 3 is Figure 1 is a schematic diagram of an electrical connection mode of a stacked light emitting unit module of a display panel provided by the application, Figure 4 is Figure 2 is a schematic diagram of an electrical connection mode of an independent light emitting unit module of a display panel provided by the application.

[0052] Referring to Figure 1 and Figure 2 An embodiment of the application provides a display panel 100. In some embodiments, the display panel 100 comprises a driving substrate 1 and a plurality of spaced stacked light emitting unit modules 2.

[0053] The driving substrate 1 comprises 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 voltage line (VDD), and the other is a ground voltage line (VSS). For example, the first voltage line L1 is the positive power voltage line, and the second voltage line L2 is the ground voltage line, or the first voltage line L1 is the ground voltage line, and the second voltage line L2 is the positive power voltage line. In some embodiments, the driving substrate 1 can further comprise a driving circuit layer (not shown in the figure) and a thin film transistor layer (not shown in the figure).

[0054] The plurality of spaced stacked light emitting unit modules 2 are arranged on one side of the driving substrate 1. The stacked light emitting unit module 2 comprises a first light emitting unit 3 and a second light emitting unit 4 arranged in a stacked and corresponding manner.

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

[0056] It should be noted that not all of the above-mentioned are electrically connected, specifically including: one of the first connecting electrode 32 and the second connecting electrode 33 is electrically connected to one of the positive power voltage line and the ground voltage line, and the other is not electrically connected to the other of the positive power voltage line and the ground voltage line; or, each of the first connecting electrode 32 and the second connecting electrode 33 is not electrically connected to each of the positive power voltage line and the ground voltage line. That is, only one of the connecting electrodes is electrically connected to the corresponding voltage line, and the other connecting electrode is not electrically connected to the corresponding voltage line; or, both connecting electrodes are not electrically connected to the corresponding voltage line. For example, the first connecting electrode 32 is electrically connected to the first voltage line L1, and the second connecting electrode 33 is not electrically connected to the second voltage line L2; or the first connecting electrode 32 is not electrically connected to the first voltage line L1, and the second connecting electrode 33 is electrically connected to the second voltage line L2; or the first connecting electrode 32 is not electrically connected to the first voltage line L1, and the second connecting 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 all 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 simultaneously receive the VDD signal and the VSS signal, 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 disposed on the side of the first light emitting unit 3 away from the driving substrate 1, and includes second light emitting elements 41 and third and fourth connection electrodes 42 and 43. The third and fourth connection electrodes 42 and 43 are disposed in a spaced apart manner, and the second light emitting elements 41 are electrically connected to the third and fourth connection electrodes 42 and 43, respectively. Specifically, the third and fourth connection electrodes 42 and 43 form a second electrode pair 44, and the plurality of second light emitting elements 41 are disposed in a one-to-one correspondence with the plurality of second electrode pairs 44. The second light emitting elements 41 include a second epitaxial layer 411 and third and fourth contact electrodes 412 and 413, and the third and fourth contact electrodes 412 and 413 are electrically connected to the third and fourth connection electrodes 42 and 43 in a one-to-one correspondence. The third and fourth connection electrodes 42 and 43 are electrically connected to the first and second voltage lines L1 and L2 in a one-to-one correspondence, i.e., the second light emitting elements 41 of the second light emitting unit 4 are electrically connected to the first and second voltage lines L1 and L2. The third and fourth connection electrodes 42 and 43 of the second light emitting unit 4 can receive VDD and VSS signals to enable the second light emitting elements 41 to perform a light emitting function, and the second light emitting unit 4 serves as a 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 the orthographic projection of the second light emitting element 41 on the driving substrate 1.

[0058] It can be understood that in the embodiments of the present application, by setting the display panel 100 to include a plurality of spaced stacked light emitting unit modules 2, and each stacked light emitting unit module 2 includes a first light emitting unit 3 and a second light emitting unit 4 which are stacked and correspondingly arranged, the first light emitting element 31 of the first light emitting unit 3 is respectively electrically connected with the first connecting electrode 32 and the second connecting electrode 33, and the first connecting electrode 32 and the second connecting electrode 33 correspond one-to-one with the first voltage line L1 and the second voltage line L2 but are not all electrically connected, and the second light emitting element 41 of the second light emitting unit 4 is respectively electrically connected with the third connecting electrode 42 and the fourth connecting electrode 43, and the third connecting electrode 42 and the fourth connecting electrode 43 are electrically connected one-to-one with the first voltage line L1 and the second voltage line L2, that is, the second light emitting element 41 is electrically connected with 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 3 can be used as the standby light emitting unit of the second light emitting unit 4. When the second light emitting unit 4 is a bad point abnormality, the light emitting element of the abnormal light emitting unit can be 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 respectively electrically connected with 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 one-to-one with the first voltage line L1 and the second voltage line L2, that is, the first light emitting element 31 corresponding to the abnormal light emitting unit is electrically connected with 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 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 setting, when the second light emitting element 41 of the stacked light emitting unit module 2 is abnormal, the first light emitting element 31 can realize light emission by only changing the electrical connection mode of the first light emitting element 31 with the first voltage line L1 and the second voltage line L2, thereby realizing the repair of the abnormal light emitting unit (bad point) in a simple and efficient manner. The above setting not only realizes the repair of the abnormal light emitting unit, and the repair operation is simple, and the first light emitting unit 3 and the second light emitting unit 4 are arranged in different layers, the orthographic projection of the first light emitting element 31 on the driving substrate 1 at least partially overlaps the orthographic projection of the second light emitting element 41 on the driving substrate 1, and the setting mode of the first light emitting unit 3 will not reduce the resolution of the display panel 100, thereby ensuring the distribution density of the second light emitting element 41 of the display panel 100, and being beneficial to improving the pixel density and the resolution of the display panel 100.

[0060] In some embodiments, the second light emitting element 41 of the second light emitting unit 4 in the stacked light emitting unit module 2 has an orthographic projection on the driving substrate 1 that overlaps with the orthographic projection of the first light emitting element 31 on the driving substrate 1, i.e., the second light emitting element 41 is directly above the first light emitting element 31. It can be understood that by arranging the orthographic projection of the second light emitting element 41 on the driving substrate 1 to overlap with the orthographic projection of the first light emitting element 31 on the driving substrate 1, the impact of the misalignment of the second light emitting element 41 and the first light emitting element 31 on the pixel resolution of the display panel 100 can be minimized, and the first light emitting element 31 corresponding to the abnormal light emitting unit can emit light normally without being blocked by the second light emitting unit 4 when repairing the abnormal light emitting unit, thereby improving the quality of the display panel 100.

[0061] Specifically, the second light emitting element 41 of the second light emitting unit 4 in 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, so that when 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 connecting electrode 32 and the second connecting electrode 33, 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 picture display function. For example, 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 in the same stacked light emitting unit module 2 can both be red, or both be green, or both be blue. In other embodiments, the second light emitting element 41 and the first light emitting element 31 in the same stacked light emitting unit module 2 can also be arranged to have other colors.

[0062] In some specific embodiments, as Figure 1 to Figure 3As shown, only one of 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 is electrically connected to the corresponding voltage line, and the other one 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 arranged and electrically connected to the first voltage line L1 in correspondence, and the second connection electrode 33 is arranged and not electrically connected to the second voltage line L2 in correspondence. Specifically, the first light emitting unit 3 is provided with a first packaging layer 5 away from the driving substrate 1, the first packaging layer 5 covers the first light emitting unit 3, the second light emitting unit 4 is arranged away from the first light emitting unit 3 on the side of the first packaging layer 5, and the first via hole 51 is arranged in the first packaging layer 5 at the 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 packaging layer 5 and exposes part of the first connection electrode 32, the third connection electrode 42 extends into the first via hole 51 and is in contact and electrically connected with the first connection electrode 32, and the third connection electrode 42 is electrically connected with the first voltage line L1 through the first connection electrode 32. The fourth connection electrode 43 penetrates the first packaging 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 can be arranged and not electrically connected to the first voltage line L1 in correspondence, and the second connection electrode 33 can be arranged and electrically connected to the second voltage line L2 in correspondence. The first via hole 51 is arranged in the first packaging layer 5 at the 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 part of the second connection electrode 33, the fourth connection electrode 43 extends into the first via hole 51 and is in contact and electrically connected with the second connection electrode 33, the fourth connection electrode 43 is electrically connected with the second voltage line L2 through the second connection electrode 33, and the third connection electrode 42 penetrates 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] Referring to Figure 2In some 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 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. The first connecting electrode 32 and the second connecting 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 signals to emit light. In this embodiment, the structure and electrical connection method of the stacked light-emitting unit module 2 are the same as those in the first embodiment.

[0065] Specifically, in some implementation methods, such as Figure 2 As shown, the independent light-emitting unit module 6 also includes a first encapsulation layer 5, a third connecting electrode 42, and a fourth connecting electrode 43. The first encapsulation layer 5 covers the first light-emitting unit 3, and the third connecting electrode 42 and the fourth connecting electrode 43 are disposed on the side of the first encapsulation layer 5 away from the driving substrate 1. See also Figure 4 The third connecting electrode 42 and the fourth connecting electrode 43 of the independent light-emitting unit module 6 are electrically connected to the first connecting electrode 32 and the second connecting electrode 33 in a one-to-one correspondence. The first connecting electrode 32 of the independent light-emitting unit module 6 is directly connected to the first voltage line L1. The second connecting electrode 33 of the independent light-emitting unit module 6 is electrically connected to the second voltage line L2 through the fourth connecting electrode 43. That is, the fourth connecting electrode 43 of the independent light-emitting unit module 6 was originally directly connected to the second voltage line L2. The second connecting electrode 33 of the first light-emitting unit 3 of the independent light-emitting unit module 6 is electrically connected to the fourth connecting electrode 43, thereby realizing the electrical connection with the second voltage line L2. This allows the first light-emitting unit 3 of the independent light-emitting unit module 6 to be electrically connected to both the first voltage line L1 and the second voltage line L2, so as to receive VDD and VSS signals and realize light emission.

[0066] In one specific implementation, such as Figure 2As shown, the second via hole 52 is arranged at the position corresponding to the fourth connecting electrode 43 and the second connecting electrode 33 of the independent light emitting unit module 6 in the first encapsulation layer 5, the second via hole 52 penetrates the first encapsulation layer 5 and exposes the second connecting electrode 33 of the part of the independent light emitting unit module 6, the fourth connecting electrode 43 extends into the second via hole 52 and is in contact with the second connecting electrode 33 for electrical connection, or the electrical connection between the fourth connecting electrode 43 and the second connecting electrode 33 of the independent light emitting unit module 6 can also be realized by filling the conductive paste in the second via hole 52, or the fourth connecting electrode 43 and the second connecting electrode 33 of the independent light emitting unit module 6 can also be welded by filling the solder in the second via hole 52 and using welding to realize the electrical connection between the two.

[0067] In some embodiments, the display panel 100 in the second embodiment can actually be a new structure formed after repairing the second light emitting unit 4 with an abnormality 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 connecting electrode 32 and the second connecting electrode 33 of the first light emitting unit 3 corresponding to the abnormal light emitting unit with the first voltage line L1 and the second voltage line L2 one by one. That is, the display panel 100 in the first embodiment is the structure before repairing the abnormal light emitting unit, and the display panel 100 in the second embodiment is the structure after repairing the abnormal light emitting unit.

[0068] Specifically, referring to Figure 1 and Figure 2 In some embodiments, the side of the second light emitting unit 4 away from the first light emitting unit 3 is also provided with a second encapsulation layer 7, 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 plurality of stacked light emitting unit modules 2, when repairing the abnormal light emitting unit, part of the second encapsulation layer 7 at the position corresponding to the abnormal light emitting unit needs to be removed first, so that the light emitting element of the abnormal light emitting unit is exposed, then the light emitting element of the abnormal light emitting unit is removed, and 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 with the first voltage line L1 and the second voltage line L2 one by one. Specifically, for example, the first connecting electrode 32 of the first light emitting unit 3 corresponding to the abnormal light emitting unit is directly electrically connected with the first voltage line L1, the second connecting electrode 33 of the first light emitting unit 3 corresponding to the abnormal light emitting unit is electrically connected with the fourth connecting electrode 43 of the abnormal light emitting unit through the second via hole 52 in the first encapsulation layer 5, and then the position of the removed light emitting element of the abnormal light emitting unit and part of the second encapsulation layer 7 is filled with encapsulation glue to make the display panel 100 in the second embodiment as shown in Figure 2 .

[0069] In other embodiments, the second light emitting unit 4 of the display panel 100 can also not be provided with the second encapsulation layer 7 on the side away from the second light emitting unit 4. After repairing the abnormal second light emitting unit 4 of the laminated light emitting unit module 2, i.e. 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, the second light emitting unit 4 can be encapsulated to form the second encapsulation layer 7 on the side away from the first light emitting unit 3 of the second light emitting unit 4.

[0070] Referring to Figure 5 to Figure 8 , Figure 5 is a flowchart of an embodiment of the method for manufacturing the display panel provided by the present application, Figure 6 is Figure 5 a flowchart of an embodiment of step S2 in Figure 7 is Figure 5 a flowchart of an embodiment of step S3 in Figure 8 is Figure 5 a flowchart of an embodiment of step S4 in

[0071] Referring to Figure 5 , an embodiment of the present application provides a method for manufacturing a display panel 100, which is used to manufacture the display panel 100 as shown in Figure 1 or Figure 2 .

[0072] Specifically, the method for manufacturing the display panel 100 can include a method for manufacturing the production process of the display panel 100 and a repairing method for the display panel 100 manufactured.

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

[0074] S1: providing a driving substrate 1.

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

[0076] S2: preparing a first light emitting layer on the side of the driving substrate 1; the first light emitting layer comprises a plurality of first light emitting units 3; each of the first light emitting units 3 comprises a first light emitting element 31, and a first connecting electrode 32 and a second connecting electrode 33 which are spaced from each other, the first light emitting element 31 is electrically connected with 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 to the first voltage line L1 and the second voltage line L2 one by one but are not all electrically connected.

[0077] Specifically, the first light emitting layer is prepared on the side of the driving substrate 1. The first light emitting layer comprises a plurality of first light emitting units 3, each of the first light emitting units 3 comprises a first light emitting element 31, and a first connecting electrode 32 and a second connecting electrode 33 which are spaced from each other, the first light emitting element 31 is electrically connected with the first connecting electrode 32 and the second connecting electrode 33 respectively, and the first connecting electrode 32 and the second connecting 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 the not all electrically connected here specifically includes: one of the first connecting electrode 32 and the second connecting electrode 33 is electrically connected with one of the positive power voltage line and the ground voltage line, and the other is not electrically connected with the other of the positive power voltage line and the ground voltage line; or, each of the first connecting electrode 32 and the second connecting electrode 33 is not electrically connected with each of the positive power voltage line and the ground voltage line. That is, only one of the connecting electrodes is electrically connected with the corresponding voltage line, and the other connecting electrode is not electrically connected with the corresponding voltage line; or, both of the connecting electrodes are not electrically connected with the corresponding voltage line. For example, the first connecting electrode 32 is electrically connected with the first voltage line L1, and the second connecting electrode 33 is not electrically connected with the second voltage line L2; or, the first connecting electrode 32 is not electrically connected with the first voltage line L1, and the second connecting electrode 33 is electrically connected with the second voltage line L2; or, the first connecting electrode 32 is not electrically connected with the first voltage line L1, and the second connecting electrode 33 is not electrically connected with the second voltage line L2. Since the first connecting electrode 32 and the second connecting electrode 33 of the first light emitting unit 3 do not all electrically connect with 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, the first light emitting element 31 cannot emit light, and the first light emitting element 31 only serves as a backup light emitting element.

[0079] In some embodiments, as shown in FIG. 2, the step S2 of preparing the first light emitting layer on the side of the driving substrate 1 specifically comprises: Figure 6

[0080] ​S21: a plurality of first electrode pairs 34 are prepared on the side of the driving substrate 1; each first electrode pair 34 includes a first connecting electrode 32 and a second connecting electrode 33; the first connecting electrode 32 is arranged corresponding to the first voltage line L1 and is electrically connected, and the second connecting electrode 33 is arranged corresponding to the second voltage line L2 and is not electrically connected.

[0081] Specifically, a plurality of first electrode pairs 34 are prepared on the side of the driving substrate 1, and the plurality of first electrode pairs 34 are arranged at intervals. 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.

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

[0083] S22: a plurality of first light emitting elements 31 are transferred on the side of the driving substrate 1; each first light emitting element 31 includes a first epitaxial layer 311, a first contact electrode 312 and a second contact electrode 313; the plurality of first light emitting elements 31 are arranged corresponding to the plurality of first electrode pairs 34 one by one, and the first contact electrode 312 and the second contact electrode 313 are electrically connected corresponding to the first connecting electrode 32 and the second connecting electrode 33 one by one.

[0084] Specifically, a plurality of first light emitting elements 31 are transferred on the side of the driving substrate 1, and the plurality of first light emitting elements 31 are arranged corresponding to the plurality of first electrode pairs 34 one by one. Each first light emitting element 31 includes a first epitaxial layer 311, a first contact electrode 312 and a second contact electrode 313, and the first contact electrode 312 and the second contact electrode 313 of the plurality of first light emitting elements 31 are electrically connected corresponding to the first connecting electrode 32 and the second connecting electrode 33 on the side of the driving substrate 1 one by one.

[0085] Because the first connecting electrode 32 is arranged corresponding to the first voltage line L1 and is electrically connected, the second connecting electrode 33 is arranged corresponding to the second voltage line L2 and is not electrically connected, and the first contact electrode 312 and the second contact electrode 313 of the first light emitting element 31 are electrically connected corresponding to the first connecting electrode 32 and the second connecting electrode 33 on the side of the driving substrate 1 one by one, therefore, the first light emitting element 31 is electrically connected to the first voltage line L1 and is 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, and cannot realize light emission, only as a backup light emitting element.

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

[0087] Specifically, in some embodiments, the first encapsulation layer 5 is prepared on the 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, the first via hole 51 is formed in the first encapsulation layer 5, which penetrates the first encapsulation layer 5 and exposes 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: A second light emitting layer is prepared on the 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, which 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 connection electrode 42 and a fourth connection electrode 43 spaced 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 respectively; wherein 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-to-one.

[0089] Specifically, the second light emitting layer is prepared on the 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, which are arranged one-to-one to the plurality of first light emitting units 3 of the first light emitting layer. Specifically, in some embodiments, the projection of the second light emitting unit 4 and the corresponding first light emitting unit 3 at least partially overlaps. It can be understood that arranging the projection of the second light emitting unit 4 and the corresponding first light emitting unit 3 at least partially overlaps will not reduce the resolution of the display panel 100 prepared and formed, and ensures the distribution density of the second light emitting element 41 of the display panel 100 prepared and formed, which is beneficial to improve the pixel density and resolution of the display panel 100 prepared and 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 spaced 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 respectively. Wherein 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-to-one.

[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 the first voltage line L1 and the second voltage line L2, and 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 a main light emitting element.

[0092] In some embodiments, as shown in FIG. 1, the step S3 of preparing the second light emitting layer on the side of the first light emitting layer away from the driving substrate 1 comprises: Figure 7

[0093] S31: preparing a plurality of second electrode pairs 44 on the side of the first encapsulation layer 5 away from the driving substrate 1; the second electrode pair 44 comprises a third connection electrode 42 and a fourth connection electrode 43; the third connection electrode 42 is electrically connected to the first connection electrode 32 through the first via hole 51; the fourth connection electrode 43 is partially overlapped with the second connection electrode 33 on the driving substrate 1 to form an overlapping area.

[0094] Specifically, the plurality of second electrode pairs 44 are prepared on the side of the first encapsulation 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 pair 44 comprises the third connection electrode 42 and the fourth connection electrode 43 which are spaced apart from each other, 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 in a one-to-one correspondence.

[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 encapsulation layer 5, and specifically, one end of the third connection electrode 42 extends into the first via hole 51 and is in contact with the first connection electrode 32 for electrical connection. 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 connection with the first connection electrode 32. In some embodiments, the fourth connection electrode 43 is directly electrically connected to the second voltage line L2, and in this step, the second connection electrode 33 is not electrically connected to the fourth connection electrode 43.

[0096] ​In some embodiments, the fourth connection electrode 43 has a projection on the driving substrate 1 that partially overlaps with a projection of the second connection electrode 33 on the driving substrate 1, forming an overlapping area. In some specific embodiments, the plurality of second electrode pairs 44 are arranged one-to-one with the 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, by arranging the fourth connection electrode 43 to have a projection on the driving substrate 1 that partially overlaps with a projection of the second connection electrode 33 on the driving substrate 1, forming an overlapping area, when the second light emitting element 41 of an abnormal light emitting unit needs to be repaired in a subsequent step, the electrical connection between the fourth connection electrode 43 and the second connection electrode 33 can be facilitated, thereby facilitating the electrical connection between the second connection electrode 33 and the second voltage line L2, so as to realize the replacement of the abnormal light emitting unit with the first light emitting unit 3 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 the side of the first encapsulation layer 5 away from the driving substrate 1; the second light emitting element 41 comprises 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 one-to-one with the plurality of second electrode pairs 44, and the third contact electrode 412 and the fourth contact electrode 413 are electrically connected one-to-one with the third connection electrode 42 and the fourth connection electrode 43.

[0098] Specifically, after the plurality of second electrode pairs 44 are prepared, 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 comprises 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 in a spaced manner, and the third contact electrode 412 and the fourth contact electrode 413 are electrically connected one-to-one with the third connection electrode 42 and the fourth connection electrode 43. In a specific embodiment, the third contact electrode 412 is electrically connected corresponding to the third connection electrode 42, and the fourth contact electrode 413 is electrically connected corresponding to the fourth connection electrode 43, so that the second light emitting element 41 is electrically connected with the third connection electrode 42 and the fourth connection electrode 43, thereby realizing the electrical connection between the second light emitting element 41 and 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 plurality of second light emitting units 4 in the second light emitting layer are arranged one-to-one corresponding to the plurality of first light emitting units 3, and the second light emitting element 41 is of the same color as the corresponding first light emitting element 31, so that when an abnormal light emitting unit occurs in the second light emitting element 41, the first light emitting element 31 corresponding to the abnormal light emitting unit can emit light of the same color as the abnormal light emitting unit when repairing the abnormal light emitting unit, thereby ensuring the repair effect of the abnormal light emitting unit and ensuring the display effect of the display panel 100.

[0100] In some embodiments, the orthographic projection of the plurality of second light emitting elements 41 on the driving substrate 1 overlaps the orthographic projection of the plurality of first light emitting elements 31 on the driving substrate 1. That is, the second light emitting element 41 is directly above the first light emitting element 31. It can be understood that by overlapping the orthographic projection of the second light emitting element 41 on the driving substrate 1 with the orthographic projection of the first light emitting element 31 on the driving substrate 1, the influence of the positional displacement of the second light emitting element 41 and the first light emitting element 31 on the pixel resolution of the display panel 100 can be maximally avoided, and the first light emitting element 31 corresponding to the abnormal light emitting unit can normally emit light without being blocked by the remaining second light emitting units 4 when repairing the abnormal light emitting unit, thereby improving the quality of the display panel 100.

[0101] S33: A second encapsulation layer 7 is prepared on the 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, the second encapsulation layer 7 is prepared on the 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, the steps S1 to S3 in the preparation method of the display panel 100 are the preparation method of the production process of the display panel 100.

[0104] In an embodiment, after step S33, a display panel 100 as shown in Figure 1 can be prepared.

[0105] Further, the preparation method of the display panel 100 further includes a repairing method for the display panel 100 prepared by the preparation method of the production process of the display panel 100 using steps S1 to S3. Specifically, the preparation method of the display panel 100 further includes:

[0106] S4: detecting whether there is an abnormal light emitting unit in the plurality of second light emitting units 4; if there is an abnormal light emitting unit, 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 with the first voltage line L1 and the second voltage line L2, 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 with the first voltage line L1 and the second voltage line L2 one by one.

[0107] Specifically, whether there is an abnormal light emitting unit in the plurality of second light emitting units 4 is detected, if it is detected that there is an abnormal light emitting unit in the plurality of 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 with 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 normally emit light, 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, as shown in Figure 8 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 with 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 in the plurality of 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 connection electrode 43 of the abnormal second light emitting unit 4 is retained, and the fourth connection electrode 43 is electrically connected with the second voltage line L2.

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

[0112] Specifically, when removing the light emitting element of the abnormal light emitting unit, the part of the second packaging layer 7 corresponding to the abnormal light emitting unit needs to be removed first, so that the light emitting element of the abnormal light emitting unit is exposed.

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

[0114] Specifically, the 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 fourth connection electrode 43 and the second connection electrode 33 are partially overlapped on the driving substrate 1 to form an overlapping area, and the second via hole 52 is arranged corresponding to the overlapping area, so as 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 and the second connection electrode 33 through the second via hole 52.

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

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

[0118] Specifically, in some embodiments, after the fourth connection electrode 43 and the second connection electrode 33 are electrically connected in step S43, the part of the second encapsulation layer 7 at the position of the light emitting element of the removed abnormal light emitting unit needs to be filled and leveled with encapsulation glue, so that the second encapsulation layer 7 can protect the second light emitting unit 4.

[0119] Specifically, in some embodiments, the step S4 of detecting whether there is an abnormal light emitting unit in the plurality of second light emitting units 4 occurs after the step S33 of preparing the second encapsulation layer 7, so as to repair the abnormality (bad point) of the display panel 100 formed by production preparation in the subsequent use process. The step S4 is a repairing method for the display panel 100 formed by production preparation, that is, a method for repairing the abnormality of the display panel 100 formed by production preparation in the use process of the user. The repairing method of the step S4 has great advantages for repairing the abnormality of the display panel 100 formed by production preparation in the use process, and 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 with the first voltage line L1 and the second voltage line L2 to realize the repairing of the abnormal light emitting unit, which is simple and efficient.

[0120] In some embodiments, after the step S43, the structure of the display panel 100 as shown in Figure 2 may be obtained. That is, after repairing the display panel 100 formed by production preparation as shown in Figure 1 , the display panel 100 as shown in Figure 2 may be obtained.

[0121] In other embodiments, step S3 can also not include the step S33 of preparing the second encapsulation layer 7 on the side of the plurality of second light emitting elements 41 away from the driving substrate 1, and in step S4, if there is an abnormal light emitting unit in the plurality of second light emitting units 4, the light emitting element of the abnormal light emitting unit can be removed, and a new second light emitting element 41 can be transferred directly at the position of the removed light emitting element of the abnormal light emitting unit, so that the newly transferred second light emitting element 41 can be electrically connected to the first voltage line L1 and the second voltage line L2 to realize light emission, and the transferred new second light emitting element 41 directly replaces the light emitting element of the abnormal light emitting unit to emit light. In step S4, the first light emitting unit 3 corresponding to the abnormal light emitting unit still does not change the electrical connection mode of the first voltage line L1 and the second voltage line L2, that is, the first light emitting unit 3 corresponding to the abnormal light emitting unit still does not electrically connect to the first voltage line L1 and the second voltage line L2. In this step, the first light emitting element 31 is still a standby light emitting element and does not emit light. That is, step S4 can also be a repair method for abnormal second light emitting units 4 in the production and preparation process of the display panel 100, so as to ensure that each second light emitting unit 4 in the second light emitting layer can normally realize the light emitting function in the production and preparation process of the display panel 100, avoid the problem that the second light emitting unit 4 cannot normally emit light due to abnormality in the production and preparation process of the display panel 100, and improve the production yield and display effect of the display panel 100. After the new second light emitting element 41 is transferred to repair the abnormal light emitting unit, the 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 light emitting unit 4 is encapsulated and protected by the second encapsulation layer 7, so as to prepare the structure of the display panel 100 as shown in FIG. 1. Figure 1

[0122] Further, in the subsequent use process of the prepared display panel 100, if the second light emitting unit 4 is abnormal, the display panel 100 can still be repaired by the original step S4, that is, by removing the light emitting element of the abnormal light emitting unit, 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 replaces the abnormal light emitting unit to emit light, thereby repairing the abnormal light emitting unit.

[0123] ​In other embodiments, step S3 can also not include the step S33 of preparing the second encapsulation layer 7 on the side of the plurality of second light emitting elements 41 away from the driving substrate 1. The plurality of second light emitting units 4 can be detected for whether there is an abnormal light emitting unit in step S4, 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, and then the second encapsulation layer 7 is prepared on the side of the plurality of second light emitting elements 41 away from the driving substrate 1. That is, the plurality of second light emitting units 4 can be detected before the second encapsulation layer 7 is prepared, so that the abnormal light emitting unit can be repaired before the second light emitting unit 4 is encapsulated in the production and preparation process of the display panel 100, and the first light emitting unit 3 corresponding to the abnormal light emitting unit is directly used to replace the abnormal light emitting unit to emit light, thereby avoiding the problem that the second light emitting unit 4 cannot normally emit light due to abnormality in the production and preparation process of the display panel 100, and improving the performance of the display panel 100 prepared. In the present embodiment, when the display panel 100 is produced and prepared, the structure of the display panel 100 as shown in Figure 2 can be directly obtained.

[0124] The display panel 100 prepared by the preparation method of the display panel 100 provided in the present application can repair the abnormal light emitting unit of the display panel 100 without affecting the resolution of the display panel 100, and the display panel 100 has better quality, which can effectively solve the problem of difficult repair of bad points of the Micro LED display panel 100 in the prior art.

[0125] The above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A display panel, characterized by, Comprising: 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 voltage line, and the other is a ground voltage line; a plurality of spaced stacked light emitting unit modules 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 stack and in correspondence; the stacked light emitting unit module is a normal pixel without repair; wherein the first light emitting unit comprises a first light emitting element, and a first connecting electrode and a second connecting electrode arranged in a space, the first light emitting element is electrically connected with 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 the side of the first light emitting unit away from the substrate, the second light emitting unit comprises a second light emitting element, and a third connecting electrode and a fourth connecting electrode arranged in a space, the second light emitting element is electrically connected with the third connecting electrode and the fourth connecting electrode respectively, the third connecting electrode and the fourth connecting electrode are electrically connected with the first voltage line and the second voltage line one by one; the orthographic projection of the first light emitting element on the driving substrate and the orthographic projection of the second light emitting element on the driving substrate at least partially overlap; when the second light emitting unit normally emits light, the first light emitting unit does not emit light.

2. The display panel according to claim 1, wherein: the first connecting electrode of the stacked light emitting unit module is arranged in correspondence with and electrically connected with the first voltage line, and the second connecting electrode is arranged in correspondence with the second voltage line but is not electrically connected.

3. The display panel of claim 2, wherein, Further comprising: an independent light emitting unit module arranged on one side of the driving substrate and spaced from the stacked light emitting unit module; the independent light emitting unit module comprises the first light emitting unit but does not comprise the second light emitting element; the independent light emitting unit module is a pixel after repair; wherein the first connecting electrode and the second connecting electrode of the independent light emitting unit module are electrically connected with the first voltage line and the second voltage line one by one.

4. The display panel of claim 3, wherein, The independent light emitting unit module further comprises: a first encapsulation layer covering the first light emitting unit; and the third connecting electrode and the fourth connecting electrode are arranged on the side of the first encapsulation 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 with the first connecting electrode and the second connecting electrode one by one; the first connecting electrode of the independent light emitting unit module is arranged in correspondence with and electrically connected with the first voltage line, and the second connecting electrode of the independent light emitting unit module is electrically connected with the second voltage line through the fourth connecting electrode.

5. The display panel according to any one of claims 1-4, wherein: 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 manufacturing a display panel, characterized by, include: Provide driving substrate; The driving substrate includes 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 formed 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 being electrically connected to the first connecting electrode and the second connecting electrode respectively; wherein, the first connecting electrode and the second connecting electrode correspond one-to-one with the first voltage line and the second voltage line but are not all electrically connected; A second light-emitting layer is formed on the 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, each of which corresponds to a plurality of first light-emitting units; each second light-emitting unit includes a second light-emitting element and a third connecting electrode and a fourth connecting electrode spaced apart from each other, the second light-emitting element being electrically connected to the third connecting electrode and the fourth connecting electrode respectively; wherein, the third connecting electrode and the fourth connecting electrode are electrically connected to the first voltage line and the second voltage line respectively. 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 connection electrode and the second connection 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 in a one-to-one correspondence.

7. The method for manufacturing a display panel according to claim 6, characterized in that, The step of fabricating the first light-emitting layer on one side of the driving substrate specifically includes: A plurality of first electrode pairs are spaced apart on one side of the driving substrate; each first electrode pair includes a first connecting electrode and a second connecting electrode; the first connecting electrode is disposed corresponding to and electrically connected to the first voltage line, and the second connecting electrode is disposed corresponding to and not electrically connected to the second voltage line. A plurality of first light-emitting elements are transferred on one side of the driving substrate; the first light-emitting element includes a first epitaxial layer and a first contact electrode and a second contact electrode; the plurality of first light-emitting elements are disposed in a one-to-one correspondence with the plurality of first electrode pairs, and the first contact electrode and the second contact electrode are electrically connected in a one-to-one correspondence with the first connecting electrode and the second connecting electrode. A first encapsulation layer is prepared on the side of the plurality of first light-emitting elements away from the driving substrate, and a first via is formed in the first encapsulation layer that penetrates the first encapsulation layer and exposes the first connecting electrode.

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

9. The method for manufacturing 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: Remove the light-emitting element of the abnormal light-emitting unit, and retain the fourth connection electrode of the abnormal light-emitting unit; A second via is formed in the first encapsulation layer corresponding to the overlapping area, penetrating the first encapsulation layer and exposing the second connection electrode; The fourth connecting electrode is electrically connected to the second connecting electrode through the second via.

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

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