Display panel and display terminal

Abstract

The present application discloses a display panel and a display terminal. The display panel includes a substrate and a plurality of light-emitting structures, each of which includes a first color light-emitting layer and a second color light-emitting layer stacked and emitting different colors; the light-emitting structure includes a first light-emitting unit and a second light-emitting unit; wherein the first light-emitting unit also includes a color conversion layer disposed on the side of the first color light-emitting layer and the second color light-emitting layer away from the substrate, and the color conversion layer converts the light emitted by the first color light-emitting layer or the second color light-emitting layer into red light. The present application configures the first light-emitting unit to include a first color light-emitting layer and a second color light-emitting layer with different emitting colors, and configures the second light-emitting unit to include a first color light-emitting layer, a second color light-emitting layer and a color conversion layer, so that the color conversion layer can be used to convert the light emitted by the first color light-emitting layer or the second color light-emitting layer into red light, thereby improving the luminous efficiency of the red light, and thus improving the overall brightness of the display panel.

Description

Technical Field

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

[0002] Micro-LED display is a micron-pitch LED array formed by miniaturizing traditional LED to achieve ultra-high density pixel resolution. Micro-LED display has the characteristics of self-luminescence. Compared with OLED and LCD display, Micro-LED display color is easier to accurately adjust, has a longer luminous life and higher brightness, and is thinner and more energy-saving. Due to its high density, small size and ultra-high pixel count, Micro-LED display will become a leader in the third-generation display technology with high realism, interactive and personalized display as its main features.

[0003] Silicon-based Micro-LED mainly refers to display panels with a size less than 2.5 inches, which can be applied to AR (Augmented Reality) / VR (Virtual Reality) displays. Silicon-based Micro-LED includes red LED, green LED and blue LED. As the size decreases, the red LED is more affected by the size effect, resulting in lower luminous efficiency than green LED and blue LED, which affects the overall brightness of the display panel.

[0004] Therefore, it is urgent to solve the above technical problems. Summary of the invention

[0005] The present application provides a display panel and a display terminal to solve the technical problem that the red LED of silicon-based Micro-LED is more affected by the size effect, resulting in lower luminous efficiency than the green LED and the blue LED, thus affecting the overall brightness of the display panel.

[0006] To solve the above technical problems, the technical solutions provided by this application are as follows:

[0007] The present application provides a display panel, the display panel comprising a substrate and a plurality of light-emitting structures arranged on the substrate, the light-emitting structures comprising a first light-emitting unit and a second light-emitting unit arranged separately, the first light-emitting unit and the second light-emitting unit each comprising a first color light-emitting layer and a second color light-emitting layer arranged in a stacked manner;

[0008] The first light-emitting unit further includes a color conversion layer, which is arranged on the side of the first color light-emitting layer or the second color light-emitting layer away from the substrate, and converts the light emitted by the first color light-emitting layer or the second color light-emitting layer into red light.

[0009] In the display panel of the present application, at least one of the first color light-emitting layer of the first light-emitting unit and the second color light-emitting layer of the first light-emitting unit emits light.

[0010] In the display panel of the present application, the display panel includes:

[0011] A first output end is arranged between the first light emitting unit and the second light emitting unit;

[0012] A first electrode, electrically connected to the first light-emitting unit;

[0013] A second electrode, electrically connected to the second light emitting unit;

[0014] Wherein, the first electrode and the second electrode are both electrically connected to the first output end.

[0015] In the display panel of the present application, the display panel includes a first bonding layer, and the first bonding layer is arranged between the substrate and the first color light-emitting layer;

[0016] Wherein, one end of the first bonding layer of the second light-emitting unit is provided with a protruding protrusion, and the protrusion is electrically connected to the second electrode.

[0017] In the display panel of the present application, the display panel includes:

[0018] A second output end is arranged on a side of the first light emitting unit away from the first output end;

[0019] The third output end and the fourth output end are both arranged on a side of the second light emitting unit away from the first output end;

[0020] A third electrode, electrically connected to the first light-emitting unit;

[0021] a fourth electrode electrically connected to the first color light-emitting layer of the second light-emitting unit;

[0022] a fifth electrode electrically connected to the second color light-emitting layer of the second light-emitting unit;

[0023] The third electrode is electrically connected to the second output terminal, the fourth electrode is electrically connected to the third output terminal, and the fifth electrode is connected to the fourth output terminal.

[0024] In the display panel of the present application, the second color light-emitting layer includes a stacked first doping layer, a quantum well layer, and a second doping layer, the first doping layer of the second color light-emitting layer of the first light-emitting unit has a first extension segment, and the first doping layer of the second color light-emitting layer of the second light-emitting unit has a second extension segment;

[0025] The first electrode is electrically connected to the first extension segment, and the second electrode is electrically connected to the second extension segment.

[0026] In the display panel of the present application, the display panel includes a second bonding layer, and the second bonding layer is arranged between the first color light-emitting layer and the second color light-emitting layer;

[0027] The second bonding layer of the second light-emitting unit exposes one end of the first color light-emitting layer of the second light-emitting unit.

[0028] In the display panel of the present application, the first color light-emitting layer is a green light-emitting layer, the second color light-emitting layer is a blue light-emitting layer, and the second color light-emitting layer is arranged on a side of the first color light-emitting layer away from the substrate.

[0029] In the display panel of the present application, the material of the color conversion layer includes quantum dot material or phosphor material.

[0030] The present application also provides a display terminal, which includes the above-mentioned display panel.

[0031] Beneficial effects: The present application discloses a display panel and a display terminal. The display panel includes a substrate and a plurality of light-emitting structures arranged on the substrate, each of the light-emitting structures includes a first color light-emitting layer and a second color light-emitting layer stacked and emitting different colors; the light-emitting structure includes a first light-emitting unit and a second light-emitting unit; wherein the first light-emitting unit also includes a color conversion layer arranged on the side of the first color light-emitting layer and the second color light-emitting layer away from the substrate, and the color conversion layer converts the light emitted by the first color light-emitting layer or the second color light-emitting layer into red light. The present application configures the first light-emitting unit to include a first color light-emitting layer and a second color light-emitting layer with different emitting colors, and configures the second light-emitting unit to include a first color light-emitting layer, a second color light-emitting layer and a color conversion layer, so that the color conversion layer can be used to convert the light emitted by the first color light-emitting layer or the second color light-emitting layer into red light, thereby improving the luminous efficiency of the red light, and thus improving the overall brightness of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0033] Figure 1 A schematic diagram of a top view of a display panel provided in an embodiment of the present application;

[0034] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at CC in FIG.

[0035] Figure 3a to Figure 3c A flow chart of the manufacturing process of a display panel provided in an embodiment of the present application.

[0036] Description of reference numerals:

[0037] Substrate 10, first color light-emitting layer 11, second color light-emitting layer 12, light-emitting structure 20, first light-emitting unit 21, first color light-emitting layer 211 of the first light-emitting unit, second color light-emitting layer 212 of the first light-emitting unit, color conversion layer 213, second light-emitting unit 22, first color light-emitting layer 221 of the second light-emitting unit, second color light-emitting layer 222 of the second light-emitting unit, second bonding layer 13, first output terminal 31, first electrode 34, second electrode 35, second output terminal 32, third electrode 36, third output terminal 33, fourth electrode 37, fifth electrode 38, first bonding layer 16, insulating layer 17, first substrate 18. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; and "inside" and "outside" refer to the outline of the device.

[0039] The present application provides a display panel, which includes a substrate 10 and a plurality of light-emitting structures 20 arranged on the substrate 10, each of the light-emitting structures 20 including a first color light-emitting layer 11 and a second color light-emitting layer 12 stacked and emitting different colors; the light-emitting structure 20 includes a first light-emitting unit 21 and a second light-emitting unit 22; wherein the first light-emitting unit 21 also includes a color conversion layer 213 arranged on the side of the first color light-emitting layer 11 or the second color light-emitting layer 12 away from the substrate 10, and the color conversion layer 213 converts the light emitted by the first color light-emitting layer 11 or the second color light-emitting layer 12 into red light.

[0040] In this embodiment, the display panel is a Micro-LED panel or the like.

[0041] In this embodiment, the substrate 10 may be an integrated circuit wafer. The substrate 10 includes a substrate and a driving circuit on the substrate. The driving circuit includes a pixel driver array. The driving circuit is used to control the light emitting structure 20 to emit light.

[0042] In this embodiment, the display panel includes a plurality of light emitting structures 20, each of which includes a stacked first color light emitting layer 11 and a second color light emitting layer 12, and the first color light emitting layer 11 and the second color light emitting layer 12 have different light emitting colors. The first color light emitting layer 11 and the second color light emitting layer 12 can be one of a blue light emitting layer and a green light emitting layer, respectively, but are not limited thereto. The first color light emitting layer 11 can be made of InGaN or GaN quantum well material, and the second color light emitting layer 12 can be made of InGaN or GaN quantum well material.

[0043] In some embodiments, the first color light-emitting layer 11 may also include a first doping layer and a second doping layer respectively disposed on the surfaces of both sides of the InGaN and GaN quantum well materials, the first doping layer and the second doping layer are respectively one of an N-type doping layer and a P-type doping layer, the N-type doping layer includes one or more of GaN, AlGaN, AlInGaN, etc.; the P-type doping layer includes GaN materials, etc. Optionally, a periodic stress adjustment layer, a current diffusion layer, etc. are also grown between the N-type doping layer and the quantum well material. A periodic stress adjustment layer, a current diffusion layer, etc. are also grown between the P-type doping layer and the quantum well material.

[0044] In some embodiments, the second color light-emitting layer 12 may also include a first doping layer and a second doping layer respectively disposed on the surfaces of both sides of the InGaN and GaN quantum well materials, the first doping layer and the second doping layer are respectively one of an N-type doping layer and a P-type doping layer, the N-type doping layer includes one or more of GaN, AlGaN, AlInGaN, etc.; the P-type doping layer includes GaN materials, etc. Optionally, a periodic stress adjustment layer, a current diffusion layer, etc. are also grown between the N-type doping layer and the quantum well material. A periodic stress adjustment layer, a current diffusion layer, etc. are also grown between the P-type doping layer and the quantum well material.

[0045] In the Micro-LED panel, the quantum well material used in the red light-emitting layer is different from the quantum well material of the green and blue light-emitting layers. The blue and green light-emitting layers can use InGaN and GaN quantum well materials, which can ensure high luminous efficiency. The red light-emitting layer uses AlGaInP and GaInP quantum well materials, which are more affected by the size effect and result in lower luminous efficiency, thus affecting the overall brightness of the device. As the size decreases, the AlGaInP and GaInP quantum well materials of the red light-emitting layer are more affected by the size effect, which restricts the application of Micro-LED in micro display panels in fields such as AR / VR.

[0046] In view of the above problems, in the present embodiment, the light-emitting structure 20 includes a first light-emitting unit 21 and a second light-emitting unit 22, and the first light-emitting unit 21 also includes a color conversion layer 213 disposed on the first color light-emitting layer 11 and the second color light-emitting layer 12. The first color light-emitting layer 11 or the second color light-emitting layer 12 can excite the material of the color conversion layer 213 to obtain red light. Since the luminous efficiency of the first color light-emitting layer 11 or the second color light-emitting layer 12 is relatively high, the brightness of the red light obtained in this way is higher than that obtained by directly using the red light-emitting layer. Therefore, the luminous efficiency of the red light can be improved, and the overall brightness of the display panel can be improved, which is beneficial to the application of Micro-LED in micro display panels in the fields of AR / VR.

[0047] In the embodiment of the present application, the first color light-emitting layer 11 and the second color light-emitting layer 12 are stacked vertically, and only two bondings are required, which simplifies the number of bondings and subsequent processes and improves the yield.

[0048] Specifically, by making all the light-emitting structures 20 include the first color light-emitting layer 11 and the second color light-emitting layer 12, the first color light-emitting layer 11 and the second color light-emitting layer 12 can be manufactured on the whole surface, and then the first color light-emitting layer 11 and the second color light-emitting layer 12 are patterned to obtain the corresponding first light-emitting unit 21 and the second light-emitting unit 22. Through the above arrangement, it is not necessary to remove the first color light-emitting layer 11 in the first light-emitting unit 21, thereby simplifying the manufacturing process of the display panel. At the same time, since the first color light-emitting layer 11 and the second color light-emitting layer 12 are laminated on the whole surface, the alignment accuracy requirement is relatively low, which reduces the process difficulty and improves the quality and yield of the display panel.

[0049] In this embodiment, the color conversion layer 213 may be a phosphor or a quantum dot material, and the quantum dot material is one of CdSe (cadmium selenide), perovskite, InP (indium phosphide), etc. Optionally, the half-peak width of the red light emitted from the color conversion layer 213 is 30 nanometers to 50 nanometers.

[0050] In this embodiment, the display panel further includes an encapsulation layer and a cover plate. The encapsulation layer covers the plurality of light-emitting structures 20 to protect the light-emitting structures 20 and prevent water vapor and the like from invading the light-emitting structures 20 and causing damage. The cover plate may be UFG (UltraFoldable Glass), ultra-thin glass (UTG), CPI (ColorlessPolyimide), PET (Polyethyleneterephthalate), etc., but is not limited thereto. The cover plate can enhance the impact resistance of the display panel and protect the display panel.

[0051] In the display panel of the present application, the first color light-emitting layer 11 is a green light-emitting layer, which can emit green light, and the second color light-emitting layer 12 is a blue light-emitting layer, which can emit blue light.

[0052] Optionally, in the first light-emitting unit 21 , one of the first color light-emitting layer 11 or the second color light-emitting layer 12 may be selected to excite the material of the color conversion layer 213 to obtain red light.

[0053] Optionally, in the first light-emitting unit 21, the first color light-emitting layer 11 and the second color light-emitting layer 12 can be selected to emit light simultaneously to excite the material of the color conversion layer 213 to obtain red light. The first color light-emitting layer 11 and the second color light-emitting layer 12 simultaneously excite the color conversion layer 213 to emit light, which is beneficial to improve the brightness of the red light.

[0054] In the second light-emitting unit 22, the first color light-emitting layer 11 and the second color light-emitting layer 12 can emit light individually or simultaneously as needed. When the first color light-emitting layer 11 and the second color light-emitting layer 12 emit light individually, monochromatic light can be obtained; when the first color light-emitting layer 11 and the second color light-emitting layer 12 emit light simultaneously, mixed color light can be obtained.

[0055] In the display panel of the present application, the second color light emitting layer 12 is disposed on the side of the first color light emitting layer 11 away from the substrate 10. The first color light emitting layer 11 is a green light emitting layer, and the second color light emitting layer 12 is a blue light emitting layer.

[0056] In this embodiment, the second color light-emitting layer 12 is disposed on the first color light-emitting layer 11. Through the above arrangement, the second color light-emitting layer 12 can be closer to the color conversion layer 213. The energy of light is inversely proportional to its wavelength. The shorter the wavelength, the higher the energy of light; the longer the wavelength, the lower the energy of light. Since the wavelength of blue light is shorter than the wavelength of green light, the energy of blue light is higher than the energy of green light. The second color light-emitting layer 12 is arranged closer to the color conversion layer 213. When the blue light-emitting layer is used to excite the material of the color conversion layer 213 to emit red light, its luminance is greater than the red light emitted by the material of the color conversion layer 213 when the green light-emitting layer is used to excite the material of the color conversion layer 213, thereby further improving the brightness of the red light.

[0057] Optionally, in some embodiments, the first color light emitting layer 11 is disposed on the side of the second color light emitting layer 12 facing away from the substrate 10. The first color light emitting layer 11 is a green light emitting layer, and the second color light emitting layer 12 is a blue light emitting layer.

[0058] In the display panel of the present application, the display panel includes a first output terminal 31, a first electrode 34, and a second electrode 35. The first output terminal 31 is arranged between the first light-emitting unit 21 and the second light-emitting unit 22; the first electrode 34 is electrically connected to the first light-emitting unit 21; the second electrode 35 is electrically connected to the second light-emitting unit 22; wherein the first electrode 34 and the second electrode 35 are both electrically connected to the first output terminal 31.

[0059] In this embodiment, the second color light-emitting layer 212 of the first light-emitting unit is electrically connected to the first electrode 34 ; the first color light-emitting layer 221 of the second light-emitting unit is electrically connected to the second electrode 35 ; and the second color light-emitting layer 222 of the second light-emitting unit is electrically connected to the second electrode 35 .

[0060] In this embodiment, the first electrode 34 is used to provide a driving signal for the second color light emitting layer 212 of the first light emitting unit. Optionally, the first color light emitting layer 211 of the first light emitting unit may not be connected to the first electrode 34, that is, the first color light emitting layer 11 in the first light emitting unit 21 may not work.

[0061] In this embodiment, the second electrode 35 is used to provide a driving signal for the second color light emitting layer 212 of the second light emitting unit.

[0062] In some embodiments, the second color light emitting layer 212 of the first light emitting unit, the first color light emitting layer 221 of the second light emitting unit, and the second color light emitting layer 222 of the second light emitting unit are all connected to the same first output terminal.

[0063] In this embodiment, the first electrode 34 and the second electrode 35 can be positive electrodes at the same time or the first electrode 34 and the second electrode 35 can be negative electrodes at the same time. The second color light-emitting layer 212 of the first light-emitting unit, the first color light-emitting layer 221 of the second light-emitting unit, and the second color light-emitting layer 222 of the second light-emitting unit are all connected to the first output end, that is, the second color light-emitting layer 212 of the first light-emitting unit, the first color light-emitting layer 221 of the second light-emitting unit, and the second color light-emitting layer 222 of the second light-emitting unit can use a common positive electrode and be connected to different negative electrodes respectively, so that the light-emitting colors of the first light-emitting unit 21 and the second light-emitting unit 22 can be controlled respectively.

[0064] Specifically, in some embodiments, the output end of the first electrode 34 can be disposed between the adjacent first light-emitting unit 21 and the second light-emitting unit 22, the P-type doped layer of the second color light-emitting layer 212 of the first light-emitting unit can be connected to the positive electrode, and the N-type doped layer of the second color light-emitting layer 212 of the first light-emitting unit can be connected to the negative electrode. The P-type doped layer can be located on the side of the quantum well material of the second color light-emitting layer 212 of the first light-emitting unit close to the substrate 10, and the N-type doped layer can be located on the side of the quantum well material of the second color light-emitting layer 212 of the first light-emitting unit away from the substrate 10.

[0065] The P-type doped layer of the second color light-emitting layer 222 of the second light-emitting unit can be connected to the positive electrode, and the N-type doped layer of the second color light-emitting layer 222 of the second light-emitting unit can be connected to the negative electrode. The P-type doped layer of the first color light-emitting layer 221 of the second light-emitting unit can be connected to the positive electrode, and the N-type doped layer of the first color light-emitting layer 221 of the second light-emitting unit can be connected to the negative electrode. The P-type doped layer can be located on the side of the quantum well material of the second color light-emitting layer 222 of the second light-emitting unit close to the substrate 10, and the N-type doped layer can be located on the side of the quantum well material of the second color light-emitting layer 222 of the second light-emitting unit away from the substrate 10.

[0066] The configuration of the P-type doped layer and the N-type doped layer of the first color light-emitting layer 221 of the second light-emitting unit is similar to that of the second color light-emitting layer 222 of the second light-emitting unit, and will not be repeated here.

[0067] It should be understood that the light emitting structure 20 further includes an insulating layer 17 , and the insulating layer 17 covers the surfaces of the first color light emitting layer 11 and the second color light emitting layer 12 .

[0068] In some embodiments, a step may be set at the end of the first color light-emitting layer 221 of the second light-emitting unit, and a step may be set at the end of the second color light-emitting layer 222 of the second light-emitting unit. The insulating layer 17 may expose the P-type doped layer or the N-type doped layer at the step, and the first electrode 34 may be electrically connected to the first color light-emitting layer 221 of the second light-emitting unit and the second color light-emitting layer 222 of the second light-emitting unit through the P-type doped layer or the N-type doped layer at the step.

[0069] In the display panel of the present application, the display panel includes a second output terminal 32, a third output terminal 33, a fourth output terminal, a third electrode 36, a fourth electrode 37, and a fifth electrode 38. The second output terminal 32 is arranged on the side of the first light-emitting unit 21 away from the first output terminal 31; the third output terminal 33 and the fourth output terminal are both arranged on the side of the second light-emitting unit 22 away from the first output terminal 31; the third electrode 36 is electrically connected to the first light-emitting unit 21; the fourth electrode 37 is electrically connected to the first color light-emitting layer 221 of the second light-emitting unit; the fifth electrode 38 is electrically connected to the second color light-emitting layer 222 of the second light-emitting unit; wherein the third electrode 36 is electrically connected to the second output terminal 32, the fourth electrode 37 is electrically connected to the third output terminal 33, and the fifth electrode 38 is connected to the fourth output terminal.

[0070] In this embodiment, the second output terminal 32 , the third output terminal 33 , and the fourth output terminal are used to provide a voltage with a polarity opposite to that of the voltage of the first output terminal 31 .

[0071] Optionally, in the first light-emitting unit 21 , the first doped layer of the second color light-emitting layer 212 of the first light-emitting unit is connected to the first electrode 34 , and the second doped layer of the second color light-emitting layer 212 of the first light-emitting unit is connected to the third electrode 36 .

[0072] In this embodiment, in the second light-emitting unit 22, the first doped layer of the first color light-emitting layer 221 of the second light-emitting unit is connected to the second electrode 35, and the second doped layer of the first color light-emitting layer 221 of the second light-emitting unit is connected to the fourth electrode 37. The first doped layer of the second color light-emitting layer 222 of the second light-emitting unit is connected to the second electrode 35, and the second doped layer of the second color light-emitting layer 222 of the second light-emitting unit is connected to the fifth electrode 38. Through the above arrangement, the first color light-emitting layer 221 of the second light-emitting unit and the second color light-emitting layer 222 of the second light-emitting unit can both be independently controlled to emit light.

[0073] In the display panel of the present application, the second color light-emitting layer includes a stacked first doped layer, a quantum well layer and a second doped layer, the first doped layer of the second color light-emitting layer 212 of the first light-emitting unit has a first extension segment, and the first doped layer of the second color light-emitting layer 222 of the second light-emitting unit has a second extension segment; wherein the first electrode 34 is electrically connected to the first extension segment, and the second electrode 35 is electrically connected to the second extension segment.

[0074] In this embodiment, by providing the first extension segment, the electrical connection between the first extension segment and the first electrode 34 can be conveniently achieved in the process. By providing the second extension segment, the electrical connection between the second extension segment and the second electrode 35 can be conveniently achieved in the process.

[0075] In the display panel of the present application, the orthographic projection of the second color luminescent layer 12 on the first color luminescent layer 11 is located in the first color luminescent layer 11 , and the orthographic projection of the color conversion layer 213 on the second color luminescent layer 12 is located in the second color luminescent layer 12 .

[0076] In this embodiment, the area of ​​the orthographic projection of the color conversion layer 213 on the substrate 10 can be less than or equal to the area of ​​the orthographic projection of the second color light-emitting layer 212 of the first light-emitting unit on the substrate 10; the area of ​​the orthographic projection of the second color light-emitting layer 12 on the substrate 10 can be less than or equal to the area of ​​the orthographic projection of the first color light-emitting layer 11 on the substrate 10.

[0077] In the display panel of the present application, a second bonding layer 13 is arranged between the first color light-emitting layer 11 and the second color light-emitting layer 12, and the orthographic projection of the second color light-emitting layer 12 on the second bonding layer 13 overlaps with the second bonding layer 13, and the second bonding layer 13 can absorb the light emitted by the second color light-emitting layer 12.

[0078] In this embodiment, the second bonding layer 13 is made of insulating material. The second bonding layer 13 can be made of transparent plastic (eg, resin), SiO2, bonding adhesive, etc. The process for forming the second bonding layer 13 can be spin-on glass coating (SOG).

[0079] In this embodiment, the second bonding layer 13 can be formed by dissolving visible yellow dye powder in a polyimide (PI) precursor to form a solution to form a blue absorber precursor, and then formed on the film surface of the first color light-emitting layer 11 by a spin coating process. Optionally, the mass percentage of the yellow dye powder in the blue absorber precursor can be 0.5%, but is not limited thereto, and the mass percentage of the yellow dye powder can be adjusted according to the absorption effect of blue light. By adding a blue absorber to the second bonding layer 13, the second bonding layer 13 can prevent the blue light emitted by the second color light-emitting layer 12 from emitting downward to excite the first color light-emitting layer 11 to emit light and cause optical crosstalk.

[0080] It should be understood that after the second bonding layer 13 is doped with a blue absorber, it can absorb blue light, but does not affect the transmission of light of other colors. That is, when the green light of the first color light-emitting layer 11 is emitted upward, the second bonding layer 13 does not absorb the green light of the first color light-emitting layer 11, thereby not affecting the normal display of the first color light-emitting layer 11.

[0081] In other embodiments, when the light to be absorbed is of other colors, an absorbent of a corresponding color may be added to the second bonding layer 13 to achieve absorption of the light of the corresponding color. This application does not limit this.

[0082] The second bonding layer 13 not only serves as a transparent bonding layer, but also prevents the light emitted by the second color light emitting layer 12 from emitting downward to excite the first color light emitting layer 11 to emit light and cause optical crosstalk. Through the above arrangement, the second color light emitting layer 222 of the second light emitting unit can make the light color purer when emitting light alone, avoiding color crosstalk from the first color light emitting layer 11.

[0083] In some embodiments, the second bonding layer 13 has a thickness of about 0.1 micrometer to about 5 micrometers. The thickness refers to the dimension in a direction perpendicular to the supporting surface of the substrate 10 .

[0084] In the display panel of the present application, the substrate 10 is provided with a driving circuit, and the driving circuit is electrically connected to the first light-emitting unit 21 and the second light-emitting unit 22 .

[0085] In this embodiment, the substrate 10 can be an integrated circuit wafer, which includes a substrate and a driving circuit on the substrate. The driving circuit includes a pixel driver array. The driving circuit is electrically connected to the first light-emitting unit 21 and the second light-emitting unit 22 for controlling the light-emitting structure 20 to emit light.

[0086] In the display panel of the present application, a first bonding layer 16 is disposed between the second color light emitting layer 12 and the substrate 10 , and the orthographic projection of the second color light emitting layer 12 on the first bonding layer 16 is located within the first bonding layer 16 .

[0087] In this embodiment, the first bonding layer 16 is a metal bonding layer, and the first bonding layer 16 may include one or more selected from the following bonding structures: Au Au bonding, Au Sn bonding, Au In bonding, Ti Ti bonding and Cu Cu bonding. The thickness of the first bonding layer 16 is about 0.1 micron to 3 microns.

[0088] In this embodiment, the P-type doped layer of the first color light-emitting layer 221 of the second light-emitting unit can be indirectly connected to the positive electrode through the first bonding layer 16. That is, the edge of the first bonding layer 16 can be partially exposed so as to contact the positive electrode, thereby realizing the connection between the first bonding layer 16 and the positive electrode, and the lower surface of the first color light-emitting layer 11 can contact the upper surface of the first bonding layer 16. Through the above arrangement, the electrical connection between the positive electrode and the first color light-emitting layer 11 can be realized.

[0089] In some embodiments, the metal bonding layer may also be used as a reflector to reflect light emitted by the first color light-emitting layer 11 or the second color light-emitting layer 12 above, thereby increasing the brightness of the display panel.

[0090] As shown Figure 3a to Figure 3c As shown, a manufacturing process of a display panel provided in an embodiment of the present application is described below.

[0091] like Figure 3aAs shown, in step S10, a substrate 10 and a first LED wafer are provided respectively.

[0092] The substrate 10 may be an integrated circuit wafer. The substrate 10 includes a substrate and a driving circuit on the substrate. The driving circuit includes a pixel driver array. The driving circuit is used to control the light emitting structure 20 to emit light.

[0093] The first LED wafer includes a first substrate 18 and a first color light-emitting layer 11. The first substrate 18 may be a sapphire substrate, or a composite of one or more of GaN, AlN, Si, SiC, etc. The first color light-emitting layer 11 may be an InGaN or GaN quantum well material. The first color light-emitting layer 11 may be a green light-emitting layer.

[0094] In step S20 , the substrate 10 and the first LED wafer are bonded.

[0095] The substrate 10 and the first LED wafer may be bonded using a first bonding layer 16. The first bonding layer 16 may include one or more bonding structures selected from the following: Au Au bonding, Au Sn bonding, Au In bonding, Ti Ti bonding, and CuCu bonding, and the thickness of the first bonding layer 16 is about 0.1 micrometer to 3 micrometers.

[0096] In step S30 , the first substrate 18 is removed from the first LED wafer.

[0097] The first substrate 18 may be removed by a laser lift-off process or wet chemical etching.

[0098] like Figure 3b As shown, in step S40, a second LED wafer is provided.

[0099] The second LED wafer may include a first substrate 18 and a second color light-emitting layer 12. The first substrate 18 may be a composite of one or more of GaN, AlN, Si, SiC, etc. The second color light-emitting layer 12 may be a quantum well material of InGaN or GaN. The second color light-emitting layer 12 may be a blue light-emitting layer.

[0100] In step S50 , the second color light emitting layer 12 of the second LED wafer is bonded to the first color light emitting layer 11 obtained in step S30 .

[0101] The second color light emitting layer 12 and the first color light emitting layer 11 can be bonded by a second bonding layer 13. The second bonding layer 13 is made of an insulating material. The second bonding layer 13 can be made of transparent plastic (e.g., resin), SiO2, bonding adhesive, etc. The process for forming the second bonding layer 13 can be spin on glass (Spin On Glass Coating, SOG).

[0102] In step S60 , the first substrate 18 is removed from the second LED wafer.

[0103] The first substrate 18 may be removed by a laser lift-off process or wet chemical etching.

[0104] like Figure 3c As shown, in step S70, the film layer is subjected to a patterning process.

[0105] The process of patterning the film layer includes coating photoresist, mask exposure, development, etching, stripping photoresist, etc. Part of the film layer is removed through the patterning process to form an independent light emitting structure 20 .

[0106] In step S80 , the insulating layer 17 , the first electrode 34 , the second electrode 35 , the third electrode 36 , the fourth electrode 37 , and the fifth electrode 38 are formed.

[0107] The insulating layer 17 may be a stack of one or more layers of silicon oxide, silicon nitride, silicon oxynitride, etc. The insulating layer 17 may be formed by chemical vapor deposition (CVD).

[0108] The process of forming the first electrode 34 , the second electrode 35 , the third electrode 36 , the fourth electrode 37 , and the fifth electrode 38 may be physical vapor deposition (PVD) film formation, and PVD includes vacuum evaporation, sputtering, ion plating, and other methods.

[0109] In step S90 , the color conversion layer 213 is formed.

[0110] A color conversion layer 213 is formed on a portion of the light emitting structure 20 to form a first light emitting unit 21 . The remaining light emitting structure 20 without the color conversion layer 213 is a second light emitting unit 22 .

[0111] In this embodiment, the color conversion layer 213 may be a phosphor or a quantum dot material, and the quantum dot material is one of CdSe (cadmium selenide), perovskite, InP (indium phosphide), etc. Optionally, the half-peak width of the red light emitted from the color conversion layer 213 is 30 nanometers to 50 nanometers.

[0112] The present application also provides a display terminal, which includes the above-mentioned display panel.

[0113] In this embodiment, the display terminal may be a micro display, such as an AR / VR device or any other product or component with a display function.

[0114] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0115] The above is a detailed introduction to a display panel and a display terminal provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display panel, characterized in that: The invention comprises a substrate and a plurality of light-emitting structures arranged on the substrate, wherein the light-emitting structures comprise a first light-emitting unit and a second light-emitting unit which are arranged separately, and each of the first light-emitting unit and the second light-emitting unit comprises a first color light-emitting layer and a second color light-emitting layer which are arranged in a stacked manner; The first light-emitting unit further includes a color conversion layer, which is disposed on a side of the first color light-emitting layer or the second color light-emitting layer away from the substrate, and converts light emitted by the first color light-emitting layer or the second color light-emitting layer into red light.

2. The display panel according to claim 1, characterized in that: At least one of the first color light-emitting layer of the first light-emitting unit and the second color light-emitting layer of the first light-emitting unit emits light.

3. The display panel according to claim 1, characterized in that: The display panel comprises: A first output end, arranged between the first light emitting unit and the second light emitting unit; A first electrode, electrically connected to the first light-emitting unit; a second electrode, electrically connected to the second light-emitting unit; Wherein, the first electrode and the second electrode are both electrically connected to the first output end.

4. The display panel according to claim 3, characterized in that: The display panel comprises a first bonding layer, wherein the first bonding layer is arranged between the substrate and the first color light emitting layer; Wherein, one end of the first bonding layer of the second light-emitting unit is provided with a protruding protrusion, and the protrusion is electrically connected to the second electrode.

5. The display panel according to claim 3, characterized in that: The display panel comprises: A second output end is arranged on a side of the first light emitting unit away from the first output end; A third output end and a fourth output end are both arranged on a side of the second light emitting unit away from the first output end; a third electrode, electrically connected to the first light-emitting unit; a fourth electrode electrically connected to the first color light-emitting layer of the second light-emitting unit; a fifth electrode electrically connected to the second color light-emitting layer of the second light-emitting unit; The third electrode is electrically connected to the second output end, the fourth electrode is electrically connected to the third output end, and the fifth electrode is connected to the fourth output end.

6. The display panel according to claim 3, characterized in that: The second color light-emitting layer comprises a stacked first doping layer, a quantum well layer, and a second doping layer, the first doping layer of the second color light-emitting layer of the first light-emitting unit has a first extension segment, and the first doping layer of the second color light-emitting layer of the second light-emitting unit has a second extension segment; The first electrode is electrically connected to the first extension segment, and the second electrode is electrically connected to the second extension segment.

7. The display panel according to claim 1, characterized in that: The display panel comprises a second bonding layer, wherein the second bonding layer is arranged between the first color light emitting layer and the second color light emitting layer; The second bonding layer of the second light-emitting unit exposes one end of the first color light-emitting layer of the second light-emitting unit.

8. The display panel according to claim 1, characterized in that: The first color light-emitting layer is a green light-emitting layer, the second color light-emitting layer is a blue light-emitting layer, and the second color light-emitting layer is arranged on a side of the first color light-emitting layer away from the substrate.

9. The display panel according to claim 1, characterized in that: The material of the color conversion layer includes quantum dot material or phosphor material.

10. A display terminal, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 9.

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