Display panel, preparation method thereof and display device

Abstract

The invention discloses a display panel and a preparation method thereof and a display device, the display panel comprises a first substrate and a second substrate which are oppositely arranged, the first substrate comprises a common electrode layer arranged on the side close to the second substrate, and the second substrate comprises a driving layer arranged on the side close to the first substrate; the light-emitting layer is arranged between the first substrate and the second substrate and comprises a plurality of light-emitting units arranged in an array mode, each light-emitting unit comprises a first electrode, a light-emitting part and a second electrode which are arranged in a stacked mode in the direction away from the first substrate, the first electrodes are electrically connected with the common electrode layer, and the second electrodes are electrically connected with the common electrode layer. The second electrode is electrically connected with the driving layer; wherein one side of the first substrate is the display side of the display panel, the first substrate is a transparent substrate, the first electrode is a transparent electrode, and the common electrode layer is a transparent conducting layer.

Description

Technical Field

[0001] The present application generally relates to the field of display technologies, and particularly relates to a display panel, a preparation method thereof, and a display device. Background Art

[0002] LED display technology, as a new display technology, has obvious advantages in image quality, refresh rate, power consumption, and brightness compared with LCD and OLED displays. These advantages enable LED displays to have a wide range of applications, such as traditional displays, near-eye displays, 3D displays, and transparent displays, etc. Especially for Mini LED and Micro LED, their sizes are only in the order of micrometers to dozens of micrometers. They can not only manufacture displays with higher pixel density (high PPI), but also add some other functions between pixels while keeping the pixel density unchanged to achieve the multi-functionality of display products.

[0003] In the prior art, when preparing an LED display panel, the adopted technology is to transfer LEDs to a driving backplane to realize the electrical connection between the PADs of the LEDs and the PADs of the driving backplane. However, the display side of the LED panel does not have a substrate structure integrating functional devices. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is expected to provide a display panel, a preparation method thereof, and a display device, which can realize a double-sided substrate, and is beneficial to the diversified and multi-functional development of LED displays.

[0005] In a first aspect, the present application provides a display panel, including:

[0006] A first substrate and a second substrate arranged oppositely, the first substrate includes a common electrode layer disposed on a side close to the second substrate, and the second substrate includes a driving layer disposed on a side close to the first substrate;

[0007] A light-emitting layer disposed between the first substrate and the second substrate, the light-emitting layer includes a plurality of light-emitting units arranged in an array, and each light-emitting unit includes a first electrode, a light-emitting portion, and a second electrode which are stacked in a direction away from the first substrate. The first electrode is electrically connected to the common electrode layer, and the second electrode is electrically connected to the driving layer;

[0008] Wherein, one side of the first substrate is the display side of the display panel, the first substrate is a transparent substrate, the first electrode is a transparent electrode, and the common electrode layer is a transparent conductive layer.

[0009] Optionally, the display panel includes a plurality of pixels, and one pixel corresponds to at least one of the light-emitting units. The first substrate and the second substrate continuously extend between adjacent pixels.

[0010] Optionally, there is a gap between adjacent light-emitting units. The light-emitting part includes a first table surface close to one side of the first substrate, a second table surface far from one side of the first substrate, and a side surface connecting the first table surface and the second table surface. The side surface is arranged at an acute angle with respect to the first substrate.

[0011] Optionally, the adjacent first electrodes are arranged at intervals. The first electrode includes a first electrode side edge arranged opposite to the adjacent first electrode.

[0012] The display panel further includes an insulating layer located between the first substrate and the second substrate. The insulating layer includes a first insulating part in contact with the side surface and a second insulating part surrounding the first electrode side edge. The first insulating part and the second insulating part are continuously distributed.

[0013] Optionally, the insulating layer includes a third insulating part located between adjacent first electrodes. The third insulating part and the second insulating part are continuously distributed.

[0014] Wherein, the third insulating part is arranged in contact with the common electrode layer.

[0015] Optionally, the insulating layer is located between the second electrode and the light-emitting unit.

[0016] The insulating layer includes a first opening. The second electrode is electrically connected to the light-emitting part through the first opening.

[0017] The material of the second electrode includes metal. The second electrode covers the second insulating part.

[0018] Optionally, the first substrate includes a first flat layer arranged on the side of the common electrode layer far from the second substrate. The first flat layer includes a plurality of light-shielding blocks. The orthographic projection of the light-shielding blocks on the first substrate does not overlap with the orthographic projection of the light-emitting units on the first substrate.

[0019] Optionally, the second substrate includes a third electrode arranged on the side of the driving layer close to the first substrate. The second electrode is electrically connected to the third electrode.

[0020] Optionally, the light-emitting unit further includes an intermediate electrode. The intermediate electrode is electrically connected to the second electrode and the third electrode respectively.

[0021] The display panel further includes a second flat layer located on the side of the light-emitting unit far from the first substrate. The second flat layer is arranged at an interval from the second substrate.

[0022] The second flat layer includes a second opening, and the intermediate electrode and the second electrode are electrically connected through the second opening.

[0023] Optionally, the light-emitting part includes a first semiconductor layer, a quantum well layer, and a second semiconductor layer that are sequentially stacked in a direction away from the first substrate;

[0024] Wherein, one of the first semiconductor layer and the second semiconductor layer is an N-type GaN layer, and the other is a P-type GaN layer.

[0025] Optionally, it further includes a conductive sealing adhesive located between the first substrate and the second substrate. The conductive sealing adhesive contains conductive particles, and the conductive sealing adhesive is electrically connected to the driving layer and the common electrode layer respectively.

[0026] Optionally, it further includes a connection electrode located between the first substrate and the second substrate. The connection electrode is electrically connected to the driving layer and the common electrode layer respectively.

[0027] Optionally, the pixel includes a plurality of sub-pixels, and each sub-pixel is correspondingly arranged with one light-emitting unit; the sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel;

[0028] The first substrate includes a first optical functional part corresponding to the red sub-pixel, and the first optical functional part is used to convert the light emitted by the light-emitting unit corresponding to the red sub-pixel into red light;

[0029] The first substrate includes a second optical functional part corresponding to the green sub-pixel, and the second optical functional part is used to convert the light emitted by the light-emitting unit corresponding to the green sub-pixel into green light.

[0030] Optionally, the light-emitting unit emits blue light or ultraviolet light.

[0031] Optionally, the first substrate includes a first glass substrate, the first glass substrate includes a first groove part and a second groove part, the first optical functional part is located in the first groove part, and the second optical functional part is located in the second groove part;

[0032] Wherein, the first optical functional part includes red quantum dots, and the second optical functional part includes green quantum dots.

[0033] Optionally, the first glass substrate includes a first surface and a second surface that are oppositely arranged. The first surface is arranged on the side close to the second substrate, and the first groove part and the second groove part are arranged on the first surface;

[0034] At least one of the first groove portion and the second groove portion is further provided with a light-emitting functional layer, and the light-emitting functional layer is disposed on one side of the first optical functional portion and / or the second optical functional portion close to the second surface.

[0035] Optionally, the first glass substrate includes a first surface and a second surface which are oppositely arranged, the first surface is disposed on one side close to the second substrate, and the first groove portion and the second groove portion are disposed on the second surface;

[0036] At least one of the first groove portion and the second groove portion is further provided with a light-emitting functional layer, and the light-emitting functional layer is disposed on one side of the first optical functional portion and / or the second optical functional portion close to the second surface.

[0037] In a second aspect, the present application provides a method for manufacturing a display panel, the method comprising:

[0038] Providing a first substrate and a second substrate, the first substrate includes a common electrode layer disposed on one side close to the second substrate, and the second substrate includes a driving layer disposed on one side close to the first substrate;

[0039] Forming a light-emitting layer between the first substrate and the second substrate, the light-emitting layer includes a plurality of light-emitting units, the light-emitting layer includes a plurality of light-emitting units arranged in an array, and the light-emitting unit includes a first electrode, a light-emitting portion, and a second electrode which are stacked in a direction away from the first substrate, the first electrode is electrically connected to the common electrode layer, and the second electrode is electrically connected to the driving layer;

[0040] Wherein, one side of the first substrate is the display side of the display panel, the first substrate is a transparent substrate, the first electrode is a transparent electrode, and the common electrode layer is a transparent conductive layer.

[0041] Optionally, forming a light-emitting layer between the first substrate and the second substrate, the method comprising:

[0042] Providing a substrate, growing an epitaxial layer on the substrate, the epitaxial layer includes a first semiconductor layer, a quantum well layer, and a second semiconductor layer which are sequentially grown on the substrate, wherein, one of the first semiconductor layer and the second semiconductor layer is an N-type GaN layer, and the other is a P-type GaN layer;

[0043] Transferring the epitaxial layer to a temporary substrate, the temporary substrate is disposed on the surface of the epitaxial layer close to the second semiconductor layer, and removing the substrate;

[0044] Growing a first electrode layer on the surface of the first semiconductor layer away from the temporary substrate;

[0045] Provide a first substrate, the first substrate including a common electrode layer, bonding the first electrode to the common electrode layer to form a light-emitting intermediate layer on the first substrate, and removing the temporary substrate;

[0046] Etch the light-emitting intermediate layer and the first electrode layer to form the light-emitting part and the first electrode.

[0047] Optionally, a light-emitting layer is formed between the first substrate and the second substrate, and the method includes:

[0048] Form an insulating layer on a surface of the light-emitting part close to the first semiconductor layer, the insulating layer including a first insulating part in contact with a side surface of the light-emitting part and a second insulating part surrounding a side edge of the first electrode, and a first opening exposing the light-emitting part is provided on the first insulating part;

[0049] Form a second electrode on a surface of the first insulating part away from the first substrate, and the second electrode is electrically connected to the light-emitting part through the first opening.

[0050] Optionally, a light-emitting layer is formed between the first substrate and the second substrate, and the method includes:

[0051] Form a second planar layer on a surface of the second electrode away from the first substrate, and a second opening exposing the second electrode is provided on the second insulating part;

[0052] Form an intermediate electrode on a surface of the second planar layer away from the first substrate, and the intermediate electrode is electrically connected to the second electrode through the second opening;

[0053] Provide a second substrate, the second substrate including a driving layer and a third electrode provided on one side of the driving layer;

[0054] Bond the intermediate electrode to the second electrode to form the light-emitting layer between the first substrate and the second substrate.

[0055] In a third aspect, the present application provides a display device including the display panel as described in any one of the above.

[0056] The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

[0057] The display panel provided by the embodiment of the present application can integrate the driving circuit on the second substrate and fabricate the common electrode layer on the first substrate by arranging the substrate substrates on both sides of the light-emitting layer. The first substrate is arranged on the display side of the light-emitting layer, which can improve the rigidity of the display panel and integrate other functional devices on the first substrate, contributing to the diversified and multifunctional development of LED displays. Description of the Drawings

[0058] Other features, objects, and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0059] Figure 1 Schematic diagram of the structure of a display panel provided by an embodiment of the present application;

[0060] Figure 2 Schematic diagram of the structure of another display panel provided by an embodiment of the present application;

[0061] Figure 3 Schematic diagram of the structure of yet another display panel provided by an embodiment of the present application;

[0062] Figure 4 Schematic diagram of the structure of another display panel provided by an embodiment of the present application;

[0063] Figure 5 Schematic diagram of the structure of yet another display panel provided by an embodiment of the present application;

[0064] Figure 6 Schematic diagram of the transfer temporary substrate of a display panel provided by an embodiment of the present application;

[0065] Figure 7 Partial cross-sectional view of a display panel provided by an embodiment of the present application;

[0066] Figure 8 Partial cross-sectional view of another display panel provided by an embodiment of the present application;

[0067] Figure 9 Partial cross-sectional view of a light-emitting intermediate layer provided by an embodiment of the present application;

[0068] Figure 10 Schematic diagram of the removal of the temporary substrate of a display panel provided by an embodiment of the present application;

[0069] Figure 11 Partial cross-sectional view of a display panel provided by an embodiment of the present application;

[0070] Figure 12 Partial cross-sectional view of another display panel provided by an embodiment of the present application;

[0071] Figure 13 Another partial cross-sectional view of a display panel provided for an embodiment of the present application;

[0072] Figure 14 A partial cross-sectional view of a display panel provided for an embodiment of the present application;

[0073] Figure 15 Another partial cross-sectional view of a display panel provided for an embodiment of the present application; Detailed implementation manners

[0074] The present application will be further described in detail below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. Additionally, it should be noted that only the parts related to the invention are shown in the drawings for the convenience of description.

[0075] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0076] Please refer to Figure 1 , the present application provides a display panel, including:

[0077] A first substrate 100 and a second substrate 200 which are oppositely arranged, the first substrate 100 includes a common electrode layer 110 disposed on a side close to the second substrate 200, and the second substrate 200 includes a driving layer 210 disposed on a side close to the first substrate 100;

[0078] A light-emitting layer 300 disposed between the first substrate 100 and the second substrate 200, the light-emitting layer 300 includes a plurality of light-emitting units 310 arranged in an array, and the light-emitting unit 310 includes a first electrode 301, a light-emitting portion 302, and a second electrode 303 which are stacked in a direction away from the first substrate 100. The first electrode 301 is electrically connected to the common electrode layer 110, and the second electrode 303 is electrically connected to the driving layer 210;

[0079] Wherein, one side of the first substrate 100 is the display side of the display panel, the first substrate 100 is a transparent substrate, the first electrode 301 is a transparent electrode, and the common electrode layer 110 is a transparent conductive layer.

[0080] In the present invention, the light-emitting unit 310 can be a micro light-emitting diode (Micro LED), or can also be a nano light-emitting diode (Nano LED). It can be understood that the types of the first electrode 301 and the second electrode 303 are not limited in the embodiments of the present application. In the present application, the first electrode 301 is used as the cathode and the second electrode 303 is used as the anode for exemplary illustration.

[0081] The first substrate 100 is disposed on the display side of the display panel. The first substrate 100 includes a first glass substrate. The common electrode layer 110 is electrically connected to the first electrode 301. The common electrode layer 110 can be one or more common electrodes. The shape and number of the common electrodes are not limited in the embodiments of the present application and are set according to needs in different embodiments.

[0082] In the embodiments of the present application, the second substrate 200 includes a second glass substrate. The driving layer 210 includes a plurality of signal lines for providing signals to the pixel units. The plurality of signal lines can include a common voltage line, a driving voltage line, a source power line, a source address line, a clock signal line, a data line, etc.

[0083] In the embodiments of the present application, the transparent electrode can be indium tin oxide (ITO), indium zinc oxide (IZO), aluminum zinc oxide (AZO), zinc oxide (ZnO), indium gallium zinc oxide (IGZO), or other suitable materials.

[0084] The display panel includes a plurality of pixels. One pixel corresponds to at least one light-emitting unit 310. The first substrate 100 and the second substrate 200 continuously extend between adjacent pixels. In the embodiments of the present application, the pixels continuously extend on the first substrate 100 and the second substrate 200, which can achieve large-panel display and simplify the preparation of the display panel.

[0085] The pixels can be arrayed in a first direction or a second direction between the first substrate 100 and the second substrate 200. In the embodiments of the present application, the first direction and the second direction can be perpendicular to each other or nearly perpendicular. The specific directions of the first direction and the second direction are not limited in the present application.

[0086] Among them, there is a gap between adjacent light-emitting units 310. The light-emitting part 302 includes a first tabletop 31 close to the first substrate 100, a second tabletop 32 far from the first substrate 100, and a side surface 33 connecting the first tabletop 31 and the second tabletop 32. The side surface 33 is arranged at an acute angle with the first substrate 100.

[0087] In the present invention, the cross-sectional shape of the light-emitting part 302 in the direction parallel to the first substrate 100 is circular or square; the cross-sectional shape in the direction perpendicular to the first substrate 100 is trapezoidal. By controlling the gas ratio, ICP power, etc. of the etching ICP-RIE, the inclination angle of the side surface 33 of the light-emitting part 302 can be controlled. The side surface 33 is arranged at an included angle with the first substrate 100. Exemplarily, the range of the included angle is 70° to 90°.

[0088] The light-emitting part 302 includes a first semiconductor layer 321, a quantum well layer 322, and a second semiconductor layer 323 that are sequentially stacked in the direction away from the first substrate 100; among them, one of the first semiconductor layer 321 and the second semiconductor layer 323 is an N-type GaN layer, and the other is a P-type GaN layer.

[0089] In the embodiment of the present application, the first electrode 301 is a cathode and the second electrode 303 is an anode. Exemplarily in the present application, the first semiconductor layer 321 is an N-type GaN layer and the second semiconductor layer 323 is a P-type GaN layer. The first electrode 301 is arranged on the first tabletop 31 and is electrically connected to the first semiconductor layer 321. The second electrode 303 is arranged on the second tabletop 32 and is electrically connected to the second semiconductor layer 323.

[0090] The material of the quantum well layer 322 can be InGaN. The component of In determines the light-emitting color of this LED structure. In the embodiment of the present application, the light-emitting color of the light-emitting unit 310 is not limited and can be designed to be blue or ultraviolet light. Of course, the present application is not limited to this. In different embodiments, the light-emitting color of the light-emitting unit 310 can also be green, etc.

[0091] Correspondingly, the light-emitting units 310 are arranged at intervals on the first panel and the second panel. The adjacent first electrodes 301 are arranged at intervals. The first electrode 301 includes a first electrode 301 side edge that is oppositely arranged with the adjacent first electrode 301.

[0092] The display panel further includes an insulating layer 304 located between the first substrate 100 and the second substrate 200. The insulating layer 304 includes a first insulating portion 341 in contact with the side surface 33 and a second insulating portion 342 surrounding the side of the first electrode 301. The first insulating portion 341 and the second insulating portion 342 are continuously distributed.

[0093] Optionally, the insulating layer 304 includes a third insulating portion 343 located between adjacent first electrodes 301. The third insulating portion 343 and the second insulating portion 342 are continuously distributed; wherein, the third insulating portion 343 is in contact with the common electrode layer 110.

[0094] In an embodiment of the present application, the material of the insulating layer 304 may be silicon nitride, silicon oxide, aluminum oxide, etc. It can be grown between two adjacent light-emitting units 310 on the first substrate 100 by Plasma Enhanced Chemical Vapor Deposition (PECVD for short), with a thickness of 0.1 - 2 μm. It can achieve insulation isolation between two adjacent light-emitting units 310, and can also achieve insulation between the first electrode 301 and the second electrode 303 on the same light-emitting unit 310. The top of the second mesa 32 is removed by an etching process to form a first opening 344, so that the second electrode 303 contacts the second semiconductor layer 323 on the second mesa 32 of the light-emitting portion 302 through the first opening 344.

[0095] Specifically, the insulating layer 304 is located between the second electrode 303 and the light-emitting unit 310; the insulating layer 304 includes a first opening 344, and the second electrode 303 is electrically connected to the light-emitting portion 302 through the first opening 344; the material of the second electrode 303 includes metal, and the second electrode 303 covers the second insulating portion 342.

[0096] In an embodiment of the present application, the second electrode 303 is a reflective electrode, and the material of the second electrode 303 includes metal. In the embodiment of the present application, the material of the second electrode 303 is not limited. The second electrode 303 may include, for example, a reflective film formed of Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr or a mixture thereof and a transparent film formed of ITO, IZO, ZnO or In2O3. In an exemplary embodiment, the second electrode 303 may have a structure of ITO / Ag / ITO. In the embodiment of the present application, using a reflective electrode as the second electrode 303 can reflect the light emitted by the pixel unit through the second electrode 303 to the light-emitting side of the light-emitting unit 310.

[0097] In order to improve the light effect of the light-emitting unit 310, in the embodiments of the present application, the first substrate 100 includes a first planar layer 120 disposed on a side of the common electrode layer 110 away from the second substrate 200. The first planar layer 120 includes a plurality of light-shielding blocks 130. A positive projection of the light-shielding blocks 130 on the first substrate 100 does not overlap with a positive projection of the light-emitting unit 310 on the first substrate 100.

[0098] In the embodiments of the present application, the material of the light-shielding layer is not limited. The light-shielding layer may be an organic material, an inorganic material, etc. For example, black resin, silicon nitride, metal, etc. By providing a light-shielding layer between two adjacent light-emitting units 310, light crosstalk between the two adjacent light-emitting units 310 can be prevented, and the display effect can be improved.

[0099] In the embodiments of the present application, the first electrode 301 and the first substrate 100 are disposed on a light-emitting side of the light-emitting unit 310. By setting both the first electrode 301 and the common electrode layer 110 as transparent electrodes, the light-emitting efficiency can be improved. The fixed connection between the first substrate 100 and the light-emitting unit 310 can be achieved by bonding the first electrode 301 on the light-emitting unit 310 to the common electrode layer 110 on the first substrate 100.

[0100] For the fixed connection between the light-emitting unit 310 and the second substrate 200, as Figure 2 shown, the second substrate 200 includes a third electrode 220 disposed on a side of the driving layer 210 close to the first substrate 100. The third electrode 220 is electrically connected to the driving layer 210, and the second electrode 303 is electrically connected to the third electrode 220.

[0101] In the embodiments of the present application, the second electrode 303 may be a multi-layer composite sub-electrode. For example, the second electrode 303 includes a first sub-electrode 331, a second sub-electrode 332, and a third sub-electrode 333 which are stacked. Both the first sub-electrode 331 and the third sub-electrode 333 are transparent electrodes, and the second sub-electrode 332 is a metal electrode, which can achieve a reflective electrode while increasing the conductivity of the second electrode 303.

[0102] To improve the connection strength between the light-emitting unit 310 and the second substrate 200, optionally, the light-emitting unit 310 further includes an intermediate electrode 306, and the intermediate electrode 306 is electrically connected to the second electrode 303 and the third electrode 220 respectively. In this embodiment, the orthographic projections of the third electrode 220 and the intermediate electrode 306 on the first substrate 100 are both within the orthographic projection range of the light-emitting unit 310 on the first substrate 100. Both the second electrode 303 and the third electrode 220 can adopt one or more layers of metal electrodes, such as an Al layer. The connection strength between the light-emitting unit 310 and the second substrate 200 is further improved by using the metal bonding performance.

[0103] The third electrode 220 and the intermediate electrode 306 can be bonded by laser-assisted bonding (LAB) technology. The laser wavelength is 1024 nm. After shaping, the laser spot is rectangular to eliminate thermal damage during the bonding process, enabling precise bonding in a low-temperature environment, avoiding thermal stress introduced by the coefficient of thermal expansion, and improving the connection strength between the first substrate 100 and the light-emitting layer 300. Of course, in other embodiments, other bonding methods can also be used, and the present application does not limit this.

[0104] The display panel further includes a second planarization layer 305 on the side of the light-emitting unit 310 away from the first substrate 100. The second planarization layer 305 is disposed at an interval from the second substrate 200. The second planarization layer 305 includes a second opening 345, and the intermediate electrode 306 is electrically connected to the second electrode 303 through the second opening 345.

[0105] The surface of the second planarization layer 305 on the side away from the first substrate 100 is flush. The second planarization layer 305 is disposed between two adjacent light-emitting units 310. The second planarization layer 305 covers the second electrode 303, which can insulate the second electrodes 303 between adjacent light-emitting units 310. At the same time, it can facilitate the insulation between the driving units corresponding to two adjacent pixels on the second substrate 200, improving the display effect of the display panel.

[0106] In the embodiment of the present application, the intermediate electrode 306 is formed on the surface of the second planarization layer 305 away from the first substrate 100. Through the second planarization layer 305, flatness, insulation, and reduction of damage to the display unit caused by laser bonding can be achieved. The second planarization layer 305 is provided with a second opening 345 at the position corresponding to the second mesa 32. The intermediate electrode 306 is electrically connected to the second electrode 303 through the second opening 345. After the intermediate electrode 306 is bonded to the third electrode 220, electrical connection between the second electrode 303 and the driving layer 210 can be achieved.

[0107] The materials of the first flat layer 120 and the second flat layer 305 may be hybrid resin materials such as polysiloxane and polysilazane. The flat layer may be formed by any one or more of sputtering, evaporation, chemical vapor deposition, and photolithography processes.

[0108] Optionally, as Figure 3 shown, the display panel further includes a conductive sealant 400 located between the first substrate 100 and the second substrate 200. The conductive sealant 400 contains conductive particles and is electrically connected to the driving layer 210 and the common electrode layer 110 respectively.

[0109] The conductive sealant 400 is disposed on the edge of the display panel and surrounds the display panel. In the embodiment of the present application, the sealant is an adhesive that fixedly connects the first substrate 100 and the second substrate 200. The conductive sealant 400 is obtained by adding conductive particles to the adhesive, which can achieve the conductive function between the first substrate 100 and the second substrate 200, realize the electrical connection between the first substrate 100 and the second substrate 200, and utilize the conductive particles to connect the signal lines on the driving layer 210 and the common electrode layer 110 to conduct. The conductive particles may be nickel (Ni), tin (Sn), lead (Pb), copper (Cu), mercury (Hg), silver (Ag), platinum (Pt), gold (Au), etc. In addition, in the embodiment of the present application, by realizing the signal transmission of the common electrode layer 110 on the sealant, a low potential can be formed around the display panel to achieve functions such as electrostatic discharge and improve the display effect.

[0110] Optionally, it further includes a connecting electrode 500 located between the first substrate 100 and the second substrate 200. The connecting electrode 500 is electrically connected to the driving layer 210 and the common electrode layer 110 respectively.

[0111] It should be noted that in the embodiment of the present application, the setting manner of the connecting electrode 500 is not limited. The connecting electrode 500 may be disposed on the first substrate 100 or the second substrate 200. Both ends of the connecting electrode 500 are in contact with the driving layer 210 and the common electrode layer 110 respectively to achieve electrical connection. In the embodiment of the present application, the shape and number of the connecting electrode 500 are not limited. The number of the connecting electrode 500 may be multiple. The cross-sectional shape of the connecting electrode 500 parallel to the first substrate 100 may be circular, square, or other equally spaced dot distributions, or may also be a continuous line distribution.

[0112] The electrical connection between the first substrate 100 and the second substrate 200 can be achieved by connecting the connection electrodes 500, while reducing the impedance load, and can also play a supporting role between the first substrate 100 and the second substrate 200. In this embodiment, the connection electrode 500 includes a first sub-connection electrode 140 located on the first substrate 100 and a second sub-connection electrode 230 located on the second substrate 200, and the first sub-connection electrode 140 and the second sub-connection electrode 230. In the embodiments of the present application, the connection manner between the first sub-connection electrode 140 and the second sub-connection electrode 230 is not limited, and can be fixed and electrically connected by means such as welding, bonding or conductive glue, and is set according to needs in different embodiments. In the embodiments of the present application, the heights of the first sub-connection electrode 140 and the second sub-connection electrode 230 are not limited.

[0113] In the embodiments of the present application, the light-emitting unit 310 emits blue light or ultraviolet light. In order to realize the three primary colors of full-color display, optionally, the pixel includes a plurality of sub-pixels, and each sub-pixel is correspondingly arranged with one light-emitting unit 310; the sub-pixels include red sub-pixels, green sub-pixels and blue sub-pixels.

[0114] The first substrate 100 includes a first optical functional part 161 corresponding to the red sub-pixel, and the first optical functional part 161 is used to convert the light emitted by the light-emitting unit 310 corresponding to the red sub-pixel into red light.

[0115] The first substrate 100 includes a second optical functional part 162 corresponding to the green sub-pixel, and the second optical functional part 162 is used to convert the light emitted by the light-emitting unit 310 corresponding to the green sub-pixel into green light.

[0116] It should be noted that according to the type of the light-emitting unit 310, for example, when the light-emitting unit 310 emits ultraviolet light, the first substrate 100 includes a third optical functional part 163 corresponding to the blue sub-pixel, and the third optical functional part 163 is used to convert the light emitted by the light-emitting unit 310 corresponding to the blue sub-pixel into green light.

[0117] When setting, the first substrate 100 includes a first glass substrate, the first glass substrate includes a first groove part 151 and a second groove part 152, the first optical functional part 161 is located in the first groove part 151, and the second optical functional part 162 is located in the second groove part 152; wherein, the first optical functional part 161 includes red quantum dots, and the second optical functional part 162 includes green quantum dots.

[0118] It should be noted that according to the different light-emitting colors of the light-emitting unit 310, the first glass substrate includes a third groove portion 153, and a third optical function portion 163 can be provided in the third groove portion 153. The third optical function portion 163 includes blue quantum dots. When the light emitted by the light-emitting element is blue light, there is no need to fill the optical function portion in the third groove portion 153. At this time, a transparent organic resin can be filled in the third groove portion 153. The transmittance of the transparent organic resin can be greater than or equal to 95%, and the refractive index of the transparent organic resin is less than the refractive index of the first glass substrate.

[0119] In the embodiment of the present application, by arranging the optical function portion in the groove portion, the optical function portion will not cause an increase in the thickness of the display panel, which helps to realize the thinning of the display panel. In the embodiment of the present application, the arrangement positions of the first groove portion 151, the second groove portion 152, and the third groove portion 153 are not limited. The orthographic projection of the corresponding light-emitting unit 310 on the first substrate 100 may partially overlap with the first groove portion 151, the second groove portion 152, and the third groove portion 153, or may be completely located within the ranges of the first groove portion 151, the second groove portion 152, and the third groove portion 153. The present application does not limit this.

[0120] In a possible embodiment, as Figure 4 shown, the first glass substrate includes a first surface 101 and a second surface 102 which are oppositely arranged. The first surface 101 is arranged on the side close to the second substrate 200, and the first groove portion 151 and the second groove portion 152 are arranged on the first surface 101.

[0121] An out-light function layer 170 is further provided in at least one of the first groove portion 151 and the second groove portion 152. The out-light function layer 170 is arranged on the side of the first optical function portion 161 and / or the second optical function portion 162 close to the second surface 102.

[0122] In the embodiment of the present application, by arranging the out-light function layer 170, the light of the pixel unit can be regulated. The out-light function layer 170 is a transparent material film layer, for example, a resin material that is transparent to visible light. For example, scattering particles can be added to the transparent material to scatter the light entering it to achieve a light homogenization effect. In some embodiments, the out-light function layer 170 can be used as a lens to achieve an optical focusing or dispersing effect.

[0123] Exemplarily, a light-emitting functional layer 170 is disposed in both the first groove portion 151 and the second groove portion 152. The light-emitting functional layer 170 is disposed on a side of the first optical functional portion 161 or the second optical functional portion 162 close to the second surface 102. A side of the first optical functional portion 161 and the second optical functional portion 162 close to the first surface 101 is flush with the first surface 101.

[0124] In an embodiment of the present application, the groove portion is disposed on the first surface 101. In a direction from the first surface 101 of the first glass substrate towards the second surface 102, a cross-section of the groove portion of the first glass substrate gradually increases. A central thickness of the light-emitting functional layer 170 is greater than an edge thickness. In this embodiment, a refractive index of the optical functional portion is greater than a refractive index of the light-emitting functional layer 170, and the refractive index of the light-emitting functional layer 170 is greater than a refractive index of the first glass substrate. The light-emitting functional layer 170 and the optical functional portion can form a lens structure to ensure that light emitted by the LED is focused, thereby improving light-emitting brightness.

[0125] It should be noted that in various embodiments of the present application, the light-emitting functional layer 170 may be located on a side of the optical functional portion away from the first surface 101, and the light-emitting functional layer 170 may also be located on a side of the optical functional portion close to the first surface 101. It is only necessary to adjust refractive indices of the light-emitting functional layer 170 and the optical functional portion to ensure smooth light emission. The present application does not limit this.

[0126] In an embodiment of the present application, different light effects can be formed by forming different structures and shapes of the light-emitting functional layer 170 in the groove. For example, in each groove, the central thickness of the light-emitting functional layer 170 is greater than the edge thickness to form a light-focusing effect of a convex lens. Alternatively, in the groove, the central thickness of the light-emitting functional layer 170 is less than the edge thickness to form a light-homogenizing effect of a concave lens.

[0127] It can be understood that the first substrate 100 may further include a packaging layer, and the packaging layer is located between the first glass substrate and the first flat layer 120. The packaging layer covers the optical functional portion. Thus arranged, the packaging layer can protect the optical functional portion, thereby reducing the risk of failure of the optical functional portion caused by water and oxygen erosion. In one embodiment, the packaging layer includes an organic film layer and an inorganic film layer, and a film layer farthest from the first glass substrate is an inorganic film layer. The packaging layer may include multiple inorganic film layers, and materials of the inorganic film layer may include, for example, at least one of carbon nitride silicon nitride and silicon oxide.

[0128] In another possible embodiment, as Figure 5As shown, the first glass substrate includes a first surface 101 and a second surface 102 which are oppositely arranged. The first surface 101 is arranged on the side close to the second substrate 200, and the first groove portion 151 and the second groove portion 152 are arranged on the second surface 102.

[0129] At least one of the first groove portion 151 and the second groove portion 152 further is provided with a light-emitting functional layer 170. The light-emitting functional layer 170 is arranged on the side of the first optical functional portion 161 and / or the second optical functional portion 162 close to the second surface 102.

[0130] Exemplarily, the first groove portion 151 and the second groove portion 152 are both provided with a light-emitting functional layer 170. The light-emitting functional layer 170 is arranged on the side of the first optical functional portion 161 or the second optical functional portion 162 close to the second surface 102, and the side of the light-emitting functional layer 170 close to the second surface 102 is flush with the second surface 102.

[0131] In the embodiment of the present application, the groove portion is arranged on the second surface 102. In the direction from the second surface 102 of the first glass substrate to the first surface 101, the cross-section of the groove portion of the first glass substrate gradually increases. The central thickness of the light-emitting functional layer 170 is greater than the edge thickness. In this embodiment, the refractive index of the optical functional portion is greater than the refractive index of the first glass substrate, and the refractive index of the light-emitting functional layer 170 is greater than the refractive index of the first glass substrate, ensuring that light is smoothly emitted to the outside.

[0132] In the present application, the light incident from the first surface 101 side of the first glass substrate to the light-emitting functional layer 170 is reflected by the light-emitting functional layer 170, and the light reflected by the first reflective layer is reflected again when it is incident on the second electrode 303; a part of the light reflected by the second electrode 303 is directly emitted through the light-emitting functional layer 170, and the other part of the light is emitted through the light-emitting functional layer 170 after multiple reflections between the second electrode 303 and the light-emitting functional layer 170, which can improve the uniformity of the emitted light; thus, the first substrate 100 may not be provided with a light homogenizing film layer or the number of light homogenizing film layers can be reduced, which is beneficial to reducing the thickness of the first substrate 100.

[0133] Based on the same concept, the present application provides a method for manufacturing a display panel, and the method includes:

[0134] S100. Provide a first substrate 100 and a second substrate 200. The first substrate 100 includes a common electrode layer 110 arranged on the side close to the second substrate 200, and the second substrate 200 includes a driving layer 210 arranged on the side close to the first substrate 100.

[0135] S200. A light-emitting layer 300 is formed between the first substrate 100 and the second substrate 200. The light-emitting layer 300 includes a plurality of light-emitting units 310. The light-emitting layer 300 includes a plurality of light-emitting units 310 arranged in an array. The light-emitting unit 310 includes a first electrode 301, a light-emitting part 302, and a second electrode 303 which are stacked in a direction away from the first substrate 100. The first electrode 301 is electrically connected to the common electrode layer 110, and the second electrode 303 is electrically connected to the driving layer 210.

[0136] Wherein, one side of the first substrate 100 is the display side of the display panel. The first substrate 100 is a transparent substrate, the first electrode 301 is a transparent electrode, and the common electrode layer 110 is a transparent conductive layer.

[0137] In the embodiment of the present application, when forming the light-emitting layer 300 between the first substrate 100 and the second substrate 200, the method includes:

[0138] ST100. Provide a substrate 600, and grow an epitaxial layer on the substrate 600. The epitaxial layer includes a first semiconductor layer 321, a quantum well layer 322, and a second semiconductor layer 323 which are sequentially grown on the substrate 600. Wherein, one of the first semiconductor layer 321 and the second semiconductor layer 323 is an N-type GaN layer, and the other is a P-type GaN layer.

[0139] The specific type of the substrate 600 can be a sapphire substrate 600, a silicon substrate 600, an n-type doped silicon carbide substrate 600, or an n-type doped gallium nitride substrate 600. Those skilled in the art can flexibly select a suitable type of substrate 600 according to the specific structure type of the LED chip. In this embodiment, the first semiconductor layer 321 can be an N-type GaN layer, and the second semiconductor layer 323 can be a P-type GaN layer.

[0140] ST200. Transfer the epitaxial layer to a temporary substrate 700, as Figure 6 shown; the temporary substrate 700 is disposed on a surface of the epitaxial layer close to the second semiconductor layer 323, and the substrate 600 is removed. The formed structure is as Figure 7 shown.

[0141] In the embodiments of the present application, there is no limitation on the manner in which the epitaxial layer is transferred to the temporary substrate 700. For example, the first semiconductor layer 321 (P-type GaN layer) on one side of the epitaxial layer can be bonded to the temporary substrate 700 through a temporary bonding adhesive 800. In the embodiments of the present application, in order to improve the bonding effect and prevent damage to the epitaxial layer, a first sub-electrode layer (transparent electrode layer) is formed on the surface of the first semiconductor layer 321 of the epitaxial layer away from the substrate 600, and is bonded to the temporary substrate 700 by using the temporary bonding adhesive 800 on the first sub-electrode layer.

[0142] The substrate 600 on one side of the first semiconductor layer 321 in the epitaxial layer is removed by means of femtosecond (or picosecond) pulsed laser lift-off. For example, a femtosecond pulsed laser with a wavelength of 260 nm can be used, and the first semiconductor layer 321 can also be thinned. The first sub-electrode layer can be used to form the first sub-electrode 331.

[0143] ST300. A first electrode layer is grown on the surface of the first semiconductor layer 321 away from the temporary substrate 700. The first electrode layer is a transparent electrode layer. The formed structure is as Figure 8 shown.

[0144] ST400. A first substrate 100 is provided. The first substrate 100 includes a common electrode layer 110, and is bonded to the common electrode layer 110 through the first electrode 301 to form a light-emitting intermediate layer on the first substrate 100. The formed structure is as Figure 9 shown; and the temporary substrate 700 and the temporary bonding adhesive 800 are removed. The formed structure is as Figure 10 shown. The common electrode layer 110 can be a transparent electrode layer.

[0145] ST500. The light-emitting intermediate layer and the first electrode layer are etched to form the light-emitting portion 302 and the first electrode 301. The formed structure is as Figure 11 shown.

[0146] ST600. An insulating layer 304 is formed on the surface of the light-emitting portion 302 close to the first semiconductor layer 321. The insulating layer 304 includes a first insulating portion 341 in contact with the side surface 33 of the light-emitting portion 302 and a second insulating portion 342 surrounding the side of the first electrode 301, and a first opening 344 exposing the light-emitting portion 302 is provided on the first insulating portion 341. The formed structure is as Figure 12 shown.

[0147] ST700. On the surface of the first insulating portion 341 away from the first substrate 100, a second electrode 303 is formed. The second electrode 303 is electrically connected to the light-emitting portion 302 through the first opening 344. The second electrode 303 conformally covers the second mesa 32 and the side surface 33. The formed structure is as Figure 13 shown.

[0148] The second electrode 303 can be a multi-layer electrode. The second electrode 303 can include a second sub-electrode layer formed sequentially on the first sub-electrode layer and a third sub-electrode layer formed on the second sub-electrode layer. The second sub-electrode layer can be a metal electrode, and the third sub-electrode layer can be a transparent electrode. The second sub-electrode layer can be patterned to form a second sub-electrode 332, and the third sub-electrode layer can be patterned to form a third sub-electrode 333.

[0149] ST800. On the surface of the second electrode 303 away from the first substrate 100, a second planarization layer 305 is formed. A second opening 345 exposing the second electrode 303 is provided on the second insulating portion 342. The second planarization layer 305 is flush on the surface away from the first substrate 100. The formed structure is as Figure 14 shown.

[0150] ST900. On the surface of the second planarization layer 305 away from the first substrate 100, an intermediate electrode 306 is formed. The intermediate electrode 306 is electrically connected to the second electrode 303 through the second opening 345. The intermediate electrode 306 can be a metal electrode. The formed structure is as Figure 15 shown.

[0151] ST1000. Provide a second substrate 200, which includes a driving layer 210 and a third electrode 220 provided on one side of the driving layer 210. The third electrode 220 is a metal electrode.

[0152] ST1100. The intermediate electrode 306 and the second electrode 303 are bonded to form the light-emitting layer 300 between the first substrate 100 and the second substrate 200. The formed structure is as Figure 2 shown.

[0153] In the field of display technology, the patterning process may only include a lithography process, or include a lithography process and an etching step, and may also include other processes for forming a predetermined pattern such as printing and inkjet; the lithography process refers to a process of forming a pattern using a photoresist, a mask, an exposure machine, etc. including processes such as film formation, exposure, and development. The corresponding patterning process can be selected according to the structure formed in the present invention.

[0154] It should be noted that the above settings of materials and values are only for the convenience of those skilled in the art to fully implement this embodiment, and they can be adjusted accordingly according to actual needs. Those skilled in the art should be aware that any obvious conventional material substitution and value change are within the protection scope of this embodiment.

[0155] Based on the same concept, the present application provides a display device, including the display panel as described in any one of the above. The display device can be a mobile phone, a tablet computer, a wearable device, an in-vehicle display, a television, a monitor, a laptop computer, a digital photo frame, a navigator, or any other product or component with a display function.

[0156] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0157] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0158] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Terms such as "arranged" as used herein can mean that one component is directly attached to another component or that one component is attached to another component through an intermediate component. The features described in one embodiment herein can be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise stated in that other embodiment.

[0159] The present invention has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of illustration and example, and are not intended to limit the present invention to the scope of the described embodiments. Those skilled in the art can understand that more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope required to be protected by the present invention.

Claims

1. A display panel, characterized in that, it comprises: A first substrate and a second substrate which are oppositely arranged. The first substrate includes a common electrode layer disposed on a side close to the second substrate, and the second substrate includes a driving layer disposed on a side close to the first substrate; A light-emitting layer disposed between the first substrate and the second substrate. The light-emitting layer includes a plurality of light-emitting units arranged in an array. The light-emitting unit includes a first electrode, a light-emitting portion, and a second electrode which are stacked in a direction away from the first substrate. The first electrode is electrically connected to the common electrode layer, and the second electrode is electrically connected to the driving layer; Wherein, one side of the first substrate is the display side of the display panel. The first substrate is a transparent substrate, the first electrode is a transparent electrode, and the common electrode layer is a transparent conductive layer.

2. The display panel according to claim 1, characterized in that, The display panel includes a plurality of pixels. One pixel corresponds to at least one of the light-emitting units, and the first substrate and the second substrate continuously extend between adjacent pixels.

3. The display panel according to claim 1, characterized in that, There is a gap between adjacent light-emitting units. The light-emitting portion includes a first mesa on a side close to the first substrate, a second mesa on a side far from the first substrate, and a side surface connecting the first mesa and the second mesa. The side surface is disposed at an acute angle with respect to the first substrate.

4. The display panel according to claim 3, characterized in that, Adjacent first electrodes are spaced apart. The first electrode includes a first electrode side edge disposed opposite to adjacent first electrodes; The display panel further includes an insulating layer located between the first substrate and the second substrate. The insulating layer includes a first insulating portion in contact with the side surface and a second insulating portion surrounding the first electrode side edge. The first insulating portion and the second insulating portion are continuously distributed.

5. The display panel according to claim 4, characterized in that, The insulating layer includes a third insulating portion located between adjacent first electrodes. The third insulating portion and the second insulating portion are continuously distributed; Wherein, the third insulating portion is in contact with the common electrode layer.

6. The display panel according to claim 5, characterized in that, The insulating layer is located between the second electrode and the light-emitting unit; The insulating layer includes a first opening, and the second electrode is electrically connected to the light-emitting portion through the first opening; The material of the second electrode includes metal, and the second electrode covers the second insulating portion.

7. The display panel according to claim 1, characterized in that, The first substrate includes a first flat layer disposed on a side of the common electrode layer away from the second substrate. The first flat layer includes a plurality of light-shielding blocks, and the orthographic projection of the light-shielding blocks on the first substrate does not overlap with the orthographic projection of the light-emitting units on the first substrate.

8. The display panel according to claim 1, characterized in that, The second substrate includes a third electrode disposed on a side of the driving layer close to the first substrate, and the second electrode is electrically connected to the third electrode.

9. The display panel according to claim 8, wherein, the light-emitting unit further includes an intermediate electrode, and the intermediate electrode is electrically connected to the second electrode and the third electrode respectively; the display panel further includes a second planarization layer on a side of the light-emitting unit away from the first substrate, and the second planarization layer is disposed at an interval from the second substrate; the second planarization layer includes a second opening, and the intermediate electrode is electrically connected to the second electrode through the second opening.

10. The display panel according to claim 1, wherein, the light-emitting portion includes a first semiconductor layer, a quantum well layer, and a second semiconductor layer that are sequentially stacked in a direction away from the first substrate; wherein, one of the first semiconductor layer and the second semiconductor layer is an N-type GaN layer, and the other is a P-type GaN layer.

11. The display panel according to claim 1, wherein, it further includes a conductive sealant located between the first substrate and the second substrate, the conductive sealant contains conductive particles, and the conductive sealant is electrically connected to the driving layer and the common electrode layer respectively.

12. The display panel according to claim 1, wherein, it further includes a connection electrode located between the first substrate and the second substrate, and the connection electrode is electrically connected to the driving layer and the common electrode layer respectively.

13. The display panel according to claim 2, wherein, the pixel includes a plurality of sub-pixels, and each sub-pixel is correspondingly disposed with one light-emitting unit; the sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel; the first substrate includes a first optical functional portion corresponding to the red sub-pixel, and the first optical functional portion is configured to convert light emitted by the light-emitting unit corresponding to the red sub-pixel into red light; the first substrate includes a second optical functional portion corresponding to the green sub-pixel, and the second optical functional portion is configured to convert light emitted by the light-emitting unit corresponding to the green sub-pixel into green light.

14. The display panel according to claim 11, wherein, the light-emitting unit emits blue light or ultraviolet light.

15. The display panel according to claim 13, wherein, the first substrate includes a first glass substrate, the first glass substrate includes a first groove portion and a second groove portion, the first optical functional portion is located in the first groove portion, and the second optical functional portion is located in the second groove portion; wherein, the first optical functional portion includes red quantum dots, and the second optical functional portion includes green quantum dots.

16. The display panel according to claim 15, wherein, the first glass substrate includes a first surface and a second surface that are oppositely disposed, the first surface is disposed on a side close to the second substrate, and the first groove portion and the second groove portion are disposed on the first surface; At least one of the first groove portion and the second groove portion is further provided with a light-emitting functional layer, and the light-emitting functional layer is disposed on one side of the first optical functional portion and / or the second optical functional portion close to the second surface.

17. The display panel according to claim 15, wherein, the first glass substrate includes a first surface and a second surface which are oppositely arranged, the first surface is disposed on one side close to the second substrate, and the first groove portion and the second groove portion are disposed on the second surface; At least one of the first groove portion and the second groove portion is further provided with a light-emitting functional layer, and the light-emitting functional layer is disposed on one side of the first optical functional portion and / or the second optical functional portion close to the second surface.

18. A method for manufacturing a display panel, wherein, the method includes: providing a first substrate and a second substrate, the first substrate includes a common electrode layer disposed on one side close to the second substrate, and the second substrate includes a driving layer disposed on one side close to the first substrate; forming a light-emitting layer between the first substrate and the second substrate, the light-emitting layer includes a plurality of light-emitting units, the light-emitting layer includes a plurality of light-emitting units arranged in an array, and the light-emitting unit includes a first electrode, a light-emitting portion, and a second electrode which are stacked in a direction away from the first substrate, the first electrode is electrically connected to the common electrode layer, and the second electrode is electrically connected to the driving layer; wherein, one side of the first substrate is the display side of the display panel, the first substrate is a transparent substrate, the first electrode is a transparent electrode, and the common electrode layer is a transparent conductive layer.

19. The method for manufacturing a display panel according to claim 18, wherein, forming a light-emitting layer between the first substrate and the second substrate, the method includes: providing a substrate, growing an epitaxial layer on the substrate, the epitaxial layer includes a first semiconductor layer, a quantum well layer, and a second semiconductor layer which are sequentially grown on the substrate, wherein, one of the first semiconductor layer and the second semiconductor layer is an N-type GaN layer, and the other is a P-type GaN layer; transferring the epitaxial layer to a temporary substrate, the temporary substrate is disposed on the surface of the epitaxial layer close to the second semiconductor layer, and removing the substrate; growing a first electrode layer on the surface of the first semiconductor layer away from the temporary substrate; providing a first substrate, the first substrate includes a common electrode layer, bonding the first electrode to the common electrode layer to form a light-emitting intermediate layer on the first substrate, and removing the temporary substrate; etching the light-emitting intermediate layer and the first electrode layer to form the light-emitting portion and the first electrode.

20. The method for manufacturing a display panel according to claim 19, wherein, forming a light-emitting layer between the first substrate and the second substrate, the method includes: An insulating layer is formed on a surface of the light-emitting portion close to the first semiconductor layer. The insulating layer includes a first insulating portion in contact with a side surface of the light-emitting portion and a second insulating portion surrounding a side edge of the first electrode, and a first opening exposing the light-emitting portion is provided on the first insulating portion; A second electrode is formed on a surface of the first insulating portion away from the first substrate, and the second electrode is electrically connected to the light-emitting portion through the first opening.

21. The method for manufacturing a display panel according to claim 20, wherein, a light-emitting layer is formed between the first substrate and the second substrate, and the method includes: a second planar layer is formed on a surface of the second electrode away from the first substrate, and a second opening exposing the second electrode is provided on the second insulating portion; an intermediate electrode is formed on a surface of the second planar layer away from the first substrate, and the intermediate electrode is electrically connected to the second electrode through the second opening; a second substrate is provided, and the second substrate includes a driving layer and a third electrode provided on one side of the driving layer; the intermediate electrode and the second electrode are bonded to form the light-emitting layer between the first substrate and the second substrate.

22. A display device, wherein, it includes the display panel according to any one of claims 1-17.

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