Hybrid light emitting unit, display panel and preparation method thereof

Abstract

This invention discloses a hybrid light-emitting unit, a display panel, and a method for manufacturing the display panel. The hybrid light-emitting unit includes: an inorganic light-emitting chip, comprising a bottom electrode and an inorganic light-emitting functional layer located on one side of the bottom electrode; a first transparent electrode connected to the side of the inorganic light-emitting functional layer away from the bottom electrode; a quantum dot light-emitting functional layer connected to the first transparent electrode away from the inorganic light-emitting chip and in series with the inorganic light-emitting chip; and a second transparent electrode connected to the quantum dot light-emitting functional layer away from the inorganic light-emitting chip. The hybrid light-emitting unit, display panel, and method for manufacturing the display panel disclosed in this invention have the advantages of improved luminous efficiency and extended service life.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a hybrid light-emitting unit, a display panel, and a method for manufacturing the display panel. Background Technology

[0002] Micro-LED (Micro Light Emitting Diode) displays are array display devices composed of micron-level semiconductor light-emitting pixels. They are composite integrated technologies that combine the technical characteristics of display, LED (Light Emitting Diode), and semiconductors. They have advantages such as self-illumination, high efficiency, low power consumption, high integration, high stability, and all-weather operation, and are considered to be the most promising next-generation display technology.

[0003] The luminous efficiency of red, green and blue Micro-LED chips varies greatly. Blue Micro-LED chips have the highest luminous efficiency, followed by green chips, and red chips have the lowest. In particular, as the size of Micro-LED chips shrinks, the luminous efficiency of red chips drops sharply.

[0004] Quantum dot light-emitting diode (QLED) displays have advantages such as active light emission, high luminous efficiency, fast response speed, and high contrast. However, the stability of blue QLED devices, in particular, remains a major obstacle to the practical application of QLEDs.

[0005] Therefore, there is an urgent need to provide a new display panel to improve the shortcomings of existing technologies, such as low luminous efficiency and poor lifespan. Summary of the Invention

[0006] Therefore, in order to overcome at least some of the defects in the prior art, the present invention provides a hybrid light-emitting unit, a display panel, and a method for manufacturing a display panel, which has the characteristics of improving luminous efficiency and increasing service life.

[0007] Specifically, in one aspect, one embodiment of the present invention provides a hybrid light-emitting unit, comprising: an inorganic light-emitting chip, including a bottom electrode and an inorganic light-emitting functional layer located on one side of the bottom electrode; a first transparent electrode connected to the side of the inorganic light-emitting functional layer away from the bottom electrode; a quantum dot light-emitting functional layer connected to the side of the first transparent electrode away from the inorganic light-emitting chip and connected in series with the inorganic light-emitting chip; and a second transparent electrode connected to the side of the quantum dot light-emitting functional layer away from the inorganic light-emitting chip.

[0008] In one embodiment of the present invention, the inorganic light-emitting functional layer includes a P-doped layer, a quantum well layer and an N-doped layer stacked sequentially, wherein the P-doped layer is adjacent to the bottom electrode and the N-doped layer is adjacent to the first transparent electrode; the quantum dot light-emitting functional layer includes a hole functional layer, a quantum dot layer and an electron functional layer stacked sequentially, wherein the hole functional layer is adjacent to the first transparent electrode and the electron functional layer is adjacent to the second transparent electrode.

[0009] In one embodiment of the present invention, the inorganic light-emitting chip is a blue light-emitting chip, and the quantum dot layer is any one of a red quantum dot layer, a green quantum dot layer, or a red-green mixed quantum dot layer.

[0010] On the other hand, another embodiment of the present invention provides a display panel, comprising: an array substrate; a plurality of hybrid light-emitting units as described in the foregoing embodiments, disposed on the array substrate, wherein the bottom electrodes of the inorganic light-emitting chips of the hybrid light-emitting units are respectively electrically connected to the array substrate; and a color filter substrate, disposed opposite to the array substrate, located on the side of the plurality of hybrid light-emitting units away from the quantum dot light-emitting functional layer.

[0011] In one embodiment of the present invention, the array substrate includes a plurality of sub-pixels, each sub-pixel is provided with a hybrid light-emitting unit, the inorganic light-emitting chip is a blue light-emitting chip, and the quantum dot light-emitting functional layer includes a quantum dot layer, the quantum dot layer being a red-green hybrid quantum dot layer.

[0012] In one embodiment of the present invention, the array substrate includes a plurality of sub-pixels, the plurality of sub-pixels including red sub-pixels, green sub-pixels and blue sub-pixels, the plurality of hybrid light-emitting units including a first hybrid light-emitting unit and a second hybrid light-emitting unit, the red sub-pixels corresponding to the first hybrid light-emitting unit, the green sub-pixels corresponding to the second hybrid light-emitting unit, the inorganic light-emitting chip being a blue light-emitting chip, and the quantum dot light-emitting functional layers of the plurality of hybrid light-emitting units each including a quantum dot layer, the quantum dot layer of the first hybrid light-emitting unit being a red quantum dot layer, and the quantum dot layer of the second hybrid light-emitting unit being a green quantum dot layer.

[0013] In one embodiment of the present invention, the plurality of hybrid light-emitting units further includes a third hybrid light-emitting unit, the blue sub-pixel corresponds to the third hybrid light-emitting unit, and the quantum dot layer of the third hybrid light-emitting unit is a red-green hybrid quantum dot layer; or, the display panel further includes a blue inorganic light-emitting unit disposed on the array substrate and electrically connected to the array substrate, the blue inorganic light-emitting unit corresponding to the blue sub-pixel.

[0014] On the other hand, one embodiment of the present invention provides a method for manufacturing a display panel, comprising: providing an array substrate; and forming a plurality of light-emitting units on the array substrate, the plurality of light-emitting units including a hybrid light-emitting unit; wherein the hybrid light-emitting unit includes: an inorganic light-emitting chip, including a bottom electrode and an inorganic light-emitting functional layer located on one side of the bottom electrode; a first transparent electrode connected to the side of the inorganic light-emitting functional layer away from the bottom electrode; a quantum dot light-emitting functional layer connected to the side of the first transparent electrode away from the inorganic light-emitting chip and connected in series with the inorganic light-emitting chip; and a second transparent electrode connected to the side of the quantum dot light-emitting functional layer away from the inorganic light-emitting chip.

[0015] In one embodiment of the present invention, forming a plurality of light-emitting units on the array substrate includes: transferring the inorganic light-emitting chips of the plurality of light-emitting units to the array substrate, and electrically connecting the bottom electrode to the array substrate; forming a planarization layer on the array substrate, filling the spaces between the inorganic light-emitting chips and planarizing the array substrate; forming a first transparent electrode and a pixel definition layer on the planarization layer, the pixel definition layer including a plurality of sub-pixel pits, the plurality of sub-pixel pits corresponding one-to-one with the plurality of light-emitting units; forming the quantum dot light-emitting functional layer in the sub-pixel pits corresponding to the hybrid light-emitting units; and forming a second transparent electrode on the side of the quantum dot light-emitting functional layer away from the array substrate.

[0016] In one embodiment of the present invention, forming the quantum dot light-emitting functional layer in the sub-pixel pit corresponding to the hybrid light-emitting unit includes: sequentially forming a hole functional layer, a quantum dot layer, and an electron functional layer in the sub-pixel pit corresponding to the hybrid light-emitting unit to obtain the quantum dot light-emitting functional layer.

[0017] In one embodiment of the present invention, the array substrate includes a plurality of sub-pixels, the plurality of sub-pixels including blue sub-pixels and a first color sub-pixel, the hybrid light-emitting unit includes a first color light-emitting unit corresponding to the first color sub-pixel, the inorganic light-emitting chip is a blue light-emitting chip, and the step of forming the quantum dot light-emitting functional layer in the sub-pixel pit corresponding to the hybrid light-emitting unit includes: sequentially forming a hole functional layer, a quantum dot layer and an electron functional layer in the sub-pixel pit corresponding to the first color light-emitting unit.

[0018] In one embodiment of the present invention, the first color light-emitting unit includes a first mixed light-emitting unit and a second mixed light-emitting unit, and the first color sub-pixel includes a red sub-pixel and a green sub-pixel. The step of sequentially forming a hole functional layer, a quantum dot layer and an electronic functional layer in the sub-pixel pits corresponding to the first color light-emitting unit includes: forming the hole functional layer in the sub-pixel pits corresponding to the first mixed light-emitting unit and the second mixed light-emitting unit; forming a green quantum dot layer on the hole functional layer of the second mixed light-emitting unit and forming a red quantum dot layer on the hole functional layer of the first mixed light-emitting unit; and forming the electronic functional layer on the green quantum dot layer and the red quantum dot layer.

[0019] In one embodiment of the present invention, the hybrid light-emitting unit further includes a third hybrid light-emitting unit, which corresponds to the blue sub-pixel. The step of forming the quantum dot light-emitting functional layer in the sub-pixel pit corresponding to the hybrid light-emitting unit further includes: sequentially forming a hole functional layer, a red-green hybrid quantum dot layer, and an electron functional layer in the sub-pixel pit corresponding to the third hybrid light-emitting unit.

[0020] In one embodiment of the present invention, the array substrate includes a plurality of sub-pixels, the inorganic light-emitting chip is a blue light-emitting chip, and the step of forming the quantum dot light-emitting functional layer in the sub-pixel pit corresponding to the hybrid light-emitting unit includes: sequentially forming a hole functional layer, a red-green hybrid quantum dot layer and an electron functional layer in each sub-pixel pit corresponding to the hybrid light-emitting unit.

[0021] As can be seen from the above, the above embodiments of the present invention can achieve one or more of the following beneficial effects: by using an inorganic light-emitting chip and a quantum dot light-emitting functional layer connected in series to achieve hybrid light emission, the advantages of the two in terms of luminous efficiency and stability are combined with each other, and the defects of a single light-emitting structure are made up for, thereby achieving higher luminous efficiency and lifespan.

[0022] Other aspects and features of the invention will become apparent from the following detailed description with reference to the accompanying drawings. However, it should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of the invention. It should also be understood that, unless otherwise indicated, the drawings are not necessarily drawn to scale; they are merely intended to conceptually illustrate the structures and processes described herein. Attached Figure Description

[0023] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of a hybrid light-emitting unit provided in one embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of a display panel provided in one embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of another display panel provided in another embodiment of the present invention.

[0027] Figure 4 This is a flowchart illustrating a method for manufacturing a display panel according to an embodiment of the present invention.

[0028] Figures 5-9 This is a schematic diagram illustrating the manufacturing process of a display panel according to an embodiment of the present invention.

[0029] [Explanation of Labels in the Attached Image]

[0030] 10: Light-emitting unit; 100: Hybrid light-emitting unit; 101: First color light-emitting unit; 101a: First hybrid light-emitting unit; 101b: Second hybrid light-emitting unit; 102: Third hybrid light-emitting unit; 103: Blue inorganic light-emitting unit; 110: Inorganic light-emitting chip; 111: Bottom electrode; 112: Inorganic light-emitting functional layer; 1121: P-doped layer; 1122: Quantum well layer; 1123: N-doped layer; 120: First transparent electrode; 130: Quantum dot light-emitting functional layer; 131: Hole functional layer; 133: Quantum dot layer; 134: Electron functional layer; 140: Second transparent electrode; 200: Array substrate; 201: Subpixel; 300: Color filter substrate; 400: Planarization layer; 500: Pixel definition layer; 501: Subpixel pit. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0033] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] It should also be noted that the division of multiple embodiments in this invention is only for the convenience of description and should not constitute a special limitation. Features in various embodiments can be combined and referenced in each other without contradiction.

[0035] [First Embodiment]

[0036] like Figure 1 The diagram shows a structural schematic of a hybrid light-emitting unit 100 according to an embodiment of the present invention. The hybrid light-emitting unit 100 includes: an inorganic light-emitting chip 110, a first transparent electrode 120, a quantum dot light-emitting functional layer 130, and a second transparent electrode 140. The inorganic light-emitting chip 110 includes a bottom electrode 111 and an inorganic light-emitting functional layer 112 located on one side of the bottom electrode 111. The first transparent electrode 120 is connected to the side of the inorganic light-emitting functional layer 112 away from the bottom electrode 111. The quantum dot light-emitting functional layer 130 is connected to the side of the first transparent electrode 120 away from the inorganic light-emitting chip 110 and is connected in series with the inorganic light-emitting chip 110. The second transparent electrode 140 is connected to the side of the quantum dot light-emitting functional layer 130 away from the inorganic light-emitting chip 110.

[0037] In this invention, the inorganic light-emitting chip 110 is, for example, a Micro-LED chip. LED (Light Emitting Diode) refers to an inorganic light-emitting diode, while Micro-LED is a micrometer-scale LED. The quantum dot light-emitting functional layer 130 is, for example, the light-emitting layer of a QLED, which mainly utilizes the electroluminescent properties of quantum dots (QDs) to emit light. This embodiment of the invention achieves hybrid light emission by connecting the quantum dot light-emitting functional layer 130 and the inorganic light-emitting chip 110 in series. This combines the advantages of QLED and Micro-LED, compensating for each other's shortcomings, and achieving better light emission effects. The specific structure of the hybrid light-emitting unit 100 provided in this embodiment of the invention will be further described below.

[0038] In one embodiment of the present invention, reference is made to... Figure 1The inorganic light-emitting functional layer 112 includes, for example, a P-doped layer 1121, a quantum well layer 1122, and an N-doped layer 1123 stacked sequentially. The P-doped layer 1121 is adjacent to the bottom electrode 111, and the N-doped layer 1123 is adjacent to the first transparent electrode 120. The P-doped layer 1121 and the N-doped layer 1123 are semiconductor materials with different doping types. For example, blue Micro-LEDs typically use gallium nitride (GaN) material, so the P-doped layer 1121 is, for example, p-type GaN, and the N-doped layer 1123 is, for example, n-type GaN. The quantum well layer 1122 is, for example, an InGaN / GaN multilayer quantum well (MQW) structure. Of course, the above materials are only illustrative examples and should not be used to limit the understanding of this embodiment. The inorganic light-emitting functional layer 112 in this case can also use other semiconductor materials. The bottom electrode 111 can be a transparent electrode material or a metal electrode material that forms a good ohmic contact with the P-doped layer 1121. It can be a single-layer metal, specifically Ni (nickel), Pt (platinum), or Au (gold), or a composite metal layer of two or more layers, such as a double-layer or multi-layer structure formed by high-reflectivity metals like Ag (silver) or Al (aluminum) and Ni, Pt, or Au. Specific double-layer structures include Ni / Ag or Ni / Al, and triple-layer structures include Ni / Ag / Au or Ni / Pt / Au. The first transparent electrode 120 and the second transparent electrode 140 are, for example, made of ITO (indium tin oxide) or IZO (indium zinc oxide). The quantum dot light-emitting functional layer 130 includes, for example, a hole functional layer 131, a quantum dot layer 133, and an electron functional layer 134 stacked sequentially. The hole functional layer 131 is adjacent to the first transparent electrode 120, and the electron functional layer 134 is adjacent to the second transparent electrode 140. The hole functional layer 131 includes, for example, a hole injection layer (HIL) and a hole transport layer (HTL). The hole injection layer is made of PEDOT:PSS (poly(3,4-ethylenedioxythiophene):polystyrene sulfonate) material, and the hole transport layer is made of PVK (polyvinylcarbazole) material. The electron functional layer 134 includes, for example, an electron transport layer (ETL) and an electron injection layer (EIL), and is made of inorganic electron transport materials such as ZnO, MgZnO, or SnO2. The quantum dot layer 133 uses quantum dot materials of different colors depending on the desired emission color. In the above structure of the present invention, for the inorganic light-emitting functional layer 112, the bottom electrode 111 and the first transparent electrode 120 serve as the anode and cathode, respectively. For the quantum dot light-emitting functional layer 130, the first transparent electrode 120 and the second transparent electrode 140 serve as the anode and cathode, respectively. Thus, the first transparent electrode 120 serves as a common electrode, realizing the series connection between the quantum dot light-emitting functional layer 130 and the inorganic light-emitting chip 110.

[0039] In one embodiment of the present invention, the inorganic light-emitting chip 110 is, for example, a blue light-emitting chip, and the quantum dot layer 133 is, for example, a red quantum dot layer, a green quantum dot layer, or a red-green quantum dot layer. That is, the hybrid light-emitting unit 100 in this embodiment can be understood as a hybrid light-emitting device of blue Micro-LED + red QLED, or a hybrid light-emitting device of blue Micro-LED + green QLED, or a white light device of blue Micro-LED + red-green hybrid QLED. Of course, this is only for the convenience of describing the hybrid light-emitting effect of the hybrid light-emitting unit 100 of the present invention, and should not be construed as a simple superposition of Micro-LED and QLED. This embodiment utilizes the blue inorganic light-emitting chip 110 and the red or green quantum dot light-emitting functional layer 130 to emit light in a hybrid manner, which can simultaneously solve the defects of low luminous efficiency of red and green Micro-LEDs and short lifespan of blue QLEDs.

[0040] [Second Embodiment]

[0041] A second embodiment of the present invention provides a display panel, see below. Figure 2 The display panel provided in this embodiment includes an array substrate 200, a plurality of hybrid light-emitting units 100, and a color filter substrate 300. Each hybrid light-emitting unit 100 includes an inorganic light-emitting chip 110, a first transparent electrode 120, a quantum dot light-emitting functional layer 130, and a second transparent electrode 140. The inorganic light-emitting chip 110 includes a bottom electrode 111 and an inorganic light-emitting functional layer 112 located on one side of the bottom electrode 111. The first transparent electrode 120 is connected to the side of the inorganic light-emitting functional layer 112 away from the bottom electrode 111. The quantum dot light-emitting functional layer 130 is connected to the side of the first transparent electrode 120 away from the inorganic light-emitting chip 110 and is connected in series with the inorganic light-emitting chip 110. The second transparent electrode 140 is connected to the side of the quantum dot light-emitting functional layer 130 away from the inorganic light-emitting chip 110. The hybrid light-emitting units 100 are disposed on the array substrate 200 and are electrically connected to the array substrate 200 through the bottom electrode 111 of the inorganic light-emitting chip 110. The color filter substrate 300 is disposed opposite to the array substrate 200 and is located on the side of the second transparent electrode 140 away from the quantum dot light-emitting functional layer 130. The specific structure of the hybrid light-emitting unit 100 can be referred to the description of the first embodiment above, and will not be repeated here.

[0042] The array substrate 200 includes multiple sub-pixels 201. For example, the multiple sub-pixels 201 refer to the positions of multiple light-emitting points on the display panel. For example, in an RGB display panel, the multiple light-emitting points include red light points, green light points, and blue light points. Each light point position is a sub-pixel 201. For example, if the pixel resolution of an RGB display panel is 1080*960, then the panel is provided with 1080*960 pixel units. Each pixel unit is provided with one red light point, one green light point, and one blue light point, that is, each pixel unit includes 3 sub-pixels 201. The array substrate 200 of the display panel includes 1080*960*3 sub-pixels 201. The number of sub-pixels 201 on the array substrate 200 can be equal to or greater than the number of hybrid light-emitting units 100. For example, if each light point is a hybrid light-emitting unit 100, then the number of sub-pixels 201 is equal to the number of hybrid light-emitting units 100. Alternatively, if hybrid light-emitting units 100 are only placed at the red and green light point positions, and other light-emitting devices, such as ordinary Micro-LED chips, are placed at the blue light point positions, then the number of sub-pixels 201 is greater than the number of hybrid light-emitting units 100. The array substrate 200 may have a circuit layer structure, which may include traces (e.g., data lines, scan lines), TFT (Thin Film Transistor) thin-film transistors, capacitors, and other suitable components. The bottom electrode 111 may be connected to the TFT thin-film transistor to achieve electrical connection with the array substrate 200. The color filter substrate 300 may have a color filter to select the color of light emitted from a corresponding area. For example, a black matrix may be provided between color filters of different colors. The display panel may also include, for example, a planarization layer 400 to planarize the surface of the array substrate 200, and a pixel definition layer 500 to define a plurality of sub-pixels 201. The pixel definition layer 500 includes a plurality of sub-pixel pits 501, each sub-pixel pit 501 corresponding to one sub-pixel, that is, each sub-pixel pit corresponding to one lamp position. The pixel definition layer 500 may include, for example, a pixel definition structure protruding from the planarization layer 400 away from the array substrate 200. This pixel definition structure is disposed between every two adjacent lamp positions to form the sub-pixel pit 501 corresponding to each lamp position. Of course, this embodiment is not limited to this. The display panel provided in this embodiment may be an active matrix (AM) or a passive matrix (PM), and this embodiment is not limited thereto.

[0043] Specifically, in one embodiment, the inorganic light-emitting functional layer 112 includes, for example, a P-doped layer 1121, a quantum well layer 1122, and an N-doped layer 1123 stacked sequentially. The P-doped layer 1121 is adjacent to the bottom electrode, and the N-doped layer 1123 is adjacent to the first transparent electrode 120. The quantum dot light-emitting functional layer 130 includes, for example, a hole functional layer 131, a quantum dot layer 133, and an electron functional layer 134 stacked sequentially. The hole functional layer 131 is adjacent to the first transparent electrode 120, and the electron functional layer 134 is adjacent to the second transparent electrode 140.

[0044] The display panel provided in this embodiment adopts a series light-emitting structure that connects the quantum dot light-emitting functional layer 130 and the inorganic light-emitting chip 110 to achieve hybrid light emission. This combines the advantages of QLED display panels and Micro-LED display panels, compensates for each other's shortcomings, and achieves better light emission effect.

[0045] Specifically, in one embodiment, the array substrate 200 includes a plurality of sub-pixels 201, each sub-pixel 201 corresponding to a hybrid light-emitting unit 100. The inorganic light-emitting chip 110 is a blue light-emitting chip, and the quantum dot layer 133 is, for example, a red-green mixed quantum dot layer. When the hybrid light-emitting unit 100 is working, the blue light emitted by the blue light-emitting chip and the red and green light emitted by the red-green mixed quantum dot layer are mixed to form white light, which is filtered into light of the corresponding color by the color filter substrate 300. For example, the color filter substrate is provided with color filters corresponding to the three colors R (red), G (green), and B (blue), so the white light emitted by the hybrid light-emitting unit 100 is filtered into light of the three colors R, G, and B. Of course, this embodiment is not limited to RGB three-color display. Since the hybrid light-emitting unit 100 emits white light, other colors can also be realized according to different settings of the color filter substrate 300. For example, a Y (yellow) color filter can also be set to realize RGBY four-color display, etc.

[0046] In another embodiment, the array substrate 200 includes a plurality of sub-pixels 201, such as red sub-pixels, green sub-pixels, and blue sub-pixels. A plurality of hybrid light-emitting units 100 include a first hybrid light-emitting unit 101a and a second hybrid light-emitting unit 101b. The red sub-pixels correspond to the first hybrid light-emitting unit 101a, and the green sub-pixels correspond to the second hybrid light-emitting unit 101b. The inorganic light-emitting chip 110 is a blue light-emitting chip. The quantum dot layer 133 of the first hybrid light-emitting unit 101a is a red quantum dot layer, and the quantum dot layer 133 of the second hybrid light-emitting unit 101b is a green quantum dot layer. The display panel also includes, for example, a blue inorganic light-emitting unit 103 disposed on the array substrate 200. The blue inorganic light-emitting unit 103 corresponds to the blue sub-pixels. The blue inorganic light-emitting unit 103 is, for example, a blue Micro-LED chip without a quantum dot layer. (Refer to...) Figure 3This is a schematic diagram of the structure of a display panel provided in this embodiment, as shown below. Figure 3 As shown, from left to right, there are red sub-pixels, green sub-pixels, and blue sub-pixels. The two hybrid light-emitting units 100 on the left are the first hybrid light-emitting unit 101a and the second hybrid light-emitting unit 101b, respectively. The one on the far right is the blue inorganic light-emitting unit 103. In this embodiment, when the first hybrid light-emitting unit 101a is working, the blue light emitted by the blue light-emitting chip and the red light emitted by the red quantum dot layer are mixed to form red-blue mixed light. For example, a red color filter is provided on the color filter substrate 300 corresponding to the red sub-pixel, so that the red sub-pixel position emits red light. When the second hybrid light-emitting unit 101b is working, the blue light emitted by the blue light-emitting chip and the green light emitted by the green quantum dot layer are mixed to form blue-green mixed light. For example, a green color filter is provided on the color filter substrate 300 corresponding to the green sub-pixel, so that the green sub-pixel position emits green light. The blue sub-pixel emits blue light, for example, from the blue light Micro-LED chip of the blue inorganic light-emitting unit 103. For example, a blue color filter can also be provided on the color filter substrate 300 corresponding to the blue sub-pixel position, so that the blue sub-pixel position emits blue light. A pixel unit is composed of red, green, and blue sub-pixels, thus achieving a full-color display effect.

[0047] In another embodiment, the array substrate 200 includes a plurality of sub-pixels 201, which, for example, include red sub-pixels, green sub-pixels, and blue sub-pixels, see reference. Figure 2The hybrid light-emitting unit 100 includes a first hybrid light-emitting unit 101a, a second hybrid light-emitting unit 101b, and a third hybrid light-emitting unit 102, which correspond to red sub-pixels, green sub-pixels, and blue sub-pixels, respectively. The inorganic light-emitting chip 110 of the hybrid light-emitting unit 100 is a blue light-emitting chip. The quantum dot layer 133 of the first hybrid light-emitting unit 101a is a red quantum dot layer, the quantum dot layer 133 of the second hybrid light-emitting unit 101b is a green quantum dot layer, and the quantum dot layer 133 of the third hybrid light-emitting unit 102 is a red-green mixed quantum dot layer. In this embodiment, when the first hybrid light-emitting unit 101a is working, the blue light emitted by the blue light-emitting chip and the red light emitted by the red quantum dot layer are mixed to form red-blue mixed light. A red color filter is provided on the color filter substrate 300, for example, corresponding to the red sub-pixel, causing the red sub-pixel to emit red light. When the second hybrid light-emitting unit 101b is working, the blue light emitted by the blue light-emitting chip and the green light emitted by the green quantum dot layer are mixed to form blue-green mixed light. A green color filter is provided on the color filter substrate 300, for example, corresponding to the green sub-pixel, causing the green sub-pixel to emit green light. The third hybrid light-emitting unit 102 mixes the blue light emitted by the blue light-emitting chip and the red-green mixed light emitted by the red-green light-emitting chip to form white light. A blue color filter is provided on the color filter substrate 300, for example, corresponding to the blue sub-pixel, causing the blue sub-pixel to emit blue light. Thus, a pixel unit composed of red, green, and blue sub-pixels can achieve a full-color display effect.

[0048] The display panel provided in the second embodiment can adopt the hybrid light-emitting unit 100 provided in the first embodiment of the present invention, which has the same beneficial effects as the first embodiment, which helps to improve the luminous efficiency of the light-emitting unit in the display panel, increase the service life, and achieve a better display effect.

[0049] [Third Embodiment]

[0050] This embodiment provides a method for manufacturing a display panel, including the following steps:

[0051] S1: Provides the array substrate;

[0052] S2: A plurality of light-emitting units are formed on the array substrate. These units include a hybrid light-emitting unit, such as the hybrid light-emitting unit 100 provided in the first embodiment of the present invention, comprising: an inorganic light-emitting chip 110, a first transparent electrode 120, a quantum dot light-emitting functional layer 130, and a second transparent electrode 140. The inorganic light-emitting chip 110 includes a bottom electrode 111 and an inorganic light-emitting functional layer 112 located on one side of the bottom electrode 111. The first transparent electrode 120 is connected to the side of the inorganic light-emitting functional layer 112 away from the bottom electrode 111. The quantum dot light-emitting functional layer 130 is connected to the side of the first transparent electrode 120 away from the inorganic light-emitting chip 110 and is connected in series with the inorganic light-emitting chip 110. The second transparent electrode 140 is connected to the side of the quantum dot light-emitting functional layer 130 away from the inorganic light-emitting chip 110.

[0053] In step S1, the array substrate provided may have a circuit layer structure, which may include traces (e.g., data lines, scan lines), TFT (Thin Film Transistor) thin-film transistors, capacitors, and other suitable components. The bottom electrode 111 is connected to the TFT thin-film transistor to achieve electrical connection with the array substrate. In step S2, the multiple light-emitting units may include other types of light-emitting structures besides the mixed light-emitting unit 100, such as independently emitting Micro-LED light-emitting structures; this embodiment is not limited to these. Of course, the display panel fabrication method may also include step S3: after applying a frame adhesive to the edge of the array substrate, assembling the color filter substrate with the array substrate and curing it to form the display panel.

[0054] Specifically, refer to Figure 4 In one embodiment of the present invention, step S2 may further include, for example:

[0055] S21: Transfer the inorganic light-emitting chip of the plurality of light-emitting units to the array substrate, so that the bottom electrode is electrically connected to the array substrate;

[0056] S22: A planarization layer is formed on the array substrate, filling the spaces between the inorganic light-emitting chips and planarizing the array substrate;

[0057] S23: The first transparent electrode and the pixel definition layer are formed on the planarization layer respectively; the pixel definition layer includes a plurality of sub-pixel pits, and the sub-pixel pits correspond one-to-one with the plurality of light-emitting units;

[0058] S25: Form the quantum dot light-emitting functional layer in the sub-pixel pit corresponding to the hybrid light-emitting unit;

[0059] S26: A second transparent electrode is formed on the side of the quantum dot light-emitting functional layer away from the array substrate.

[0060] Specifically, step S21 is as follows Figure 5 As shown, the inorganic light-emitting chips 110 of multiple light-emitting units 10 are transferred to the array substrate 200. These inorganic light-emitting chips 110 are used to form the hybrid light-emitting unit 100. Of course, while performing step S21, other light-emitting structures besides the inorganic light-emitting chips 110 of the hybrid light-emitting unit 100 can also be transferred. For example, the multiple light-emitting units 10 may also include blue inorganic light-emitting units 103. While performing step S21, step S211 is also performed: the blue inorganic light-emitting unit is transferred to the array substrate, and the blue inorganic light-emitting unit is electrically connected to the array substrate. For example, if both the blue inorganic light-emitting unit 103 and the inorganic light-emitting chip 110 are blue Micro-LED chips, they can be transferred to the array substrate 200 in the same batch. Connection lines, etc., have already been formed on the array substrate 200. Step S22 is as follows... Figure 6 As shown, a planarization layer 400 is formed on the array substrate 200. The planarization layer 400 fills the spaces between the inorganic light-emitting chips 110. When the multiple light-emitting units 10 also include blue inorganic light-emitting units 103, the planarization layer 400, for example, also fills the spaces between the inorganic light-emitting chips 110 and the blue inorganic light-emitting units 103 (or also fills the spaces between multiple blue inorganic light-emitting units 103). The planarization layer 400 is further processed by methods such as chemical mechanical polishing or plasma etching to expose the upper surface of the inorganic light-emitting chips 110 and make it flush with the planarization layer 400. Step S23 is as follows. Figure 7 As shown, a pixel definition layer 500 is formed after the first transparent electrode 120 is formed on the planarization layer 400. Alternatively, the pixel definition layer 500 can be formed first, and then the first transparent electrode can be formed in the sub-pixel pit 501 corresponding to the hybrid light-emitting unit 100. The first transparent electrode 120 is formed into an ITO film layer by sputtering or vapor deposition, and the transparent pixel electrode is etched by photolithography. Of course, this embodiment does not limit the material and formation method of the first transparent electrode 120. Under permissible conditions, IZO material can also be used, and the etching process can also be chemical solution etching. The pixel definition layer 500 includes a plurality of sub-pixel pits 501, and each sub-pixel pit 501 corresponds one-to-one with a light-emitting unit 10 to define the position of the sub-pixel 201. That is, each sub-pixel pit 501 corresponds to the position of one light-emitting unit 10 (including the hybrid light-emitting unit 100 or even the blue inorganic light-emitting chip 103) and corresponds to one sub-pixel 201. The description of the pixel definition layer 500, sub-pixel pits 501 and sub-pixels 201 can be referred to the second embodiment, and will not be repeated here. Step S25 as follows Figure 8As shown, a quantum dot light-emitting functional layer 130 is formed in the sub-pixel pits 501 corresponding to the hybrid light-emitting unit 100. The corresponding sub-pixel pits can be all sub-pixel pits 501 or only a portion of them. For example, if all the multiple light-emitting units 10 are hybrid light-emitting units 100, then all the sub-pixel pits 501 are formed. Alternatively, if some of the multiple light-emitting units 10 are hybrid light-emitting units 100 and others are other types of light-emitting structures (e.g., blue inorganic light-emitting units 103), then only a portion of the sub-pixel pits 501 are formed. For example... Figure 8 Of the three sub-pixel pits 501 shown, only the left two sub-pixel pits 501 correspond to light-emitting units 10 that are hybrid light-emitting units 100. Therefore, only the left two sub-pixel pits 501 form a quantum dot light-emitting functional layer 130. The rightmost sub-pixel pit 501 corresponds to a blue inorganic light-emitting unit 103, so no quantum dot light-emitting functional layer 130 is formed in the rightmost sub-pixel pit 501. Step S26 is as follows. Figure 9 As shown, a second transparent electrode 140 is formed on the side of the quantum dot light-emitting functional layer 130 away from the array substrate 200, wherein the material and formation process of the second transparent electrode 140 can be the same as those of the first transparent electrode 120. Of course, as... Figures 5-9 Taking only the three light-emitting units on the display panel as an example is not a limiting condition for understanding this embodiment.

[0061] The display panel fabrication method of this embodiment only requires transferring the inorganic light-emitting chip once in step S21, and then fabricating the quantum dot light-emitting functional layer, which can simplify the fabrication process of the display panel and reduce the fabrication difficulty.

[0062] Furthermore, in one embodiment of the present invention, the array substrate 200 includes, for example, a plurality of sub-pixels 201, and step S25 includes, for example, forming a hole functional layer, a quantum dot layer and an electronic functional layer sequentially in the sub-pixel pits corresponding to the hybrid light-emitting unit to obtain the quantum dot light-emitting functional layer. The hole functional layer, quantum dot layer and electronic functional layer can be formed by inkjet printing process or coating process.

[0063] Furthermore, in one embodiment of the present invention, the array substrate 200 includes a plurality of sub-pixels 201, wherein the plurality of sub-pixels 201 include blue sub-pixels and first color sub-pixels, the hybrid light-emitting unit 100 includes a first color light-emitting unit 101 corresponding to the first color sub-pixel, the inorganic light-emitting chip 110 is a blue light-emitting chip, and step S25 specifically includes, for example:

[0064] Step S251: A hole functional layer, a quantum dot layer, and an electronic functional layer are sequentially formed in the sub-pixel pit corresponding to the first color emitting unit.

[0065] The first color sub-pixel may include, for example, a red sub-pixel, a green sub-pixel, or a sub-pixel of a color other than blue (e.g., a yellow sub-pixel). This embodiment is not limited to this. The first color light-emitting unit 101 may be a first mixed light-emitting unit 101a corresponding to a red sub-pixel and a second mixed light-emitting unit 101b corresponding to a green sub-pixel. More specifically, if the first color sub-pixel includes, for example, a red sub-pixel and a green sub-pixel, and the first color light-emitting unit 101 may be a first mixed light-emitting unit 101a corresponding to a red sub-pixel and a second mixed light-emitting unit 101b corresponding to a green sub-pixel, then step S251 includes: forming the hole functional layer (e.g., forming a hole injection layer and a hole transport layer sequentially) in the sub-pixel pits corresponding to the first mixed light-emitting unit and the second mixed light-emitting unit; forming a green quantum dot layer on the hole functional layer of the second mixed light-emitting unit and a red quantum dot layer on the hole functional layer of the first mixed light-emitting unit; and forming the electron functional layer (e.g., forming an electron injection layer and an electron transport layer sequentially) on the green quantum dot layer and the red quantum dot layer. The first hybrid light-emitting unit is used to emit a mixture of blue and red light, and the second hybrid light-emitting unit is used to emit a mixture of blue and green light.

[0066] Furthermore, the hybrid light-emitting unit 101 also includes a third hybrid light-emitting unit 102, which corresponds to the blue sub-pixel. Step S25 may further include step S252: sequentially forming a hole functional layer, a red-green mixed quantum dot layer, and an electron functional layer in the pit of the sub-pixel corresponding to the third hybrid light-emitting unit. The third hybrid light-emitting unit 102 is used to emit white light mixed with red, green, and blue light. Step S26 may, for example, immediately follow step S251 without executing step S252. For instance, the blue sub-pixel corresponds to the blue inorganic light-emitting unit 103, which only has a blue light-emitting chip and no quantum dot functional layer, and is used to emit blue light. (See reference...) Figure 8 and Figure 9 For example, red sub-pixels, green sub-pixels, and blue sub-pixels are arranged in order from left to right. In step S25, quantum dot light-emitting functional layer 130 is formed only in the sub-pixel pits 501 corresponding to the first and second mixed light-emitting units on the left. That is, step S251 is executed, but step S252 is not executed. Then, the second transparent electrode 140 is formed through step S26. In this way, only the blue light-emitting chip of the blue inorganic light-emitting unit 103 is set in the rightmost blue sub-pixel, which emits blue light.

[0067] In another embodiment, the array substrate 200 includes multiple sub-pixels 201. The inorganic light-emitting chip in step S21 is a blue light-emitting chip. The multiple sub-pixels 201 can correspond to various display colors, such as RGB three-color sub-pixels or RGBY four-color sub-pixels. Step S25 specifically includes step S253: forming a hole functional layer, a red-green mixed quantum dot layer, and an electron functional layer sequentially in the pit of each sub-pixel corresponding to the mixed light-emitting unit. This causes each mixed light-emitting unit to emit white light mixed with red, green, and blue. Combined with color filters of different colors set on the color filter substrate corresponding to each sub-pixel, a full-color display effect of the display panel can be achieved.

[0068] The display panel fabrication method provided in this embodiment can be used to fabricate the display panel provided in the second embodiment. It has the same beneficial effects as the second embodiment, which helps to improve the luminous efficiency of the light-emitting units in the display panel, increase its service life, and achieve a better display effect. Furthermore, it reduces the difficulty of display panel fabrication.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A hybrid light-emitting unit, characterized in that, include: An inorganic light-emitting chip includes a bottom electrode and an inorganic light-emitting functional layer located on one side of the bottom electrode; The first transparent electrode is connected to the side of the inorganic light-emitting functional layer away from the bottom electrode; A quantum dot light-emitting functional layer is connected to the side of the first transparent electrode away from the inorganic light-emitting chip and is connected in series with the inorganic light-emitting chip; The second transparent electrode is connected to the side of the quantum dot light-emitting functional layer away from the inorganic light-emitting chip; The inorganic light-emitting chip is a blue Micro-LED chip; the first transparent electrode is shared as the cathode of the inorganic light-emitting chip and the anode of the quantum dot light-emitting functional layer, realizing the series connection between the quantum dot light-emitting functional layer and the inorganic light-emitting chip.

2. The hybrid light-emitting unit as described in claim 1, characterized in that, The inorganic light-emitting functional layer includes a P-doped layer, a quantum well layer, and an N-doped layer stacked sequentially. The P-doped layer is adjacent to the bottom electrode, and the N-doped layer is adjacent to the first transparent electrode. The quantum dot light-emitting functional layer includes a hole functional layer, a quantum dot layer, and an electron functional layer stacked sequentially. The hole functional layer is adjacent to the first transparent electrode, and the electron functional layer is adjacent to the second transparent electrode.

3. The hybrid light-emitting unit as described in claim 2, characterized in that, The quantum dot layer is any one of a red quantum dot layer, a green quantum dot layer, or a red-green mixed quantum dot layer.

4. A display panel, characterized in that, include: Array substrate; Multiple hybrid light-emitting units as described in claim 1 or 2 are disposed on the array substrate, and the bottom electrodes of the inorganic light-emitting chips of the multiple hybrid light-emitting units are respectively electrically connected to the array substrate; A color filter substrate is disposed opposite to the array substrate and is located on the side of the second transparent electrode of the plurality of hybrid light-emitting units that is away from the quantum dot light-emitting functional layer; The array substrate further includes a planarization layer and a pixel definition layer. The planarization layer fills the space between adjacent inorganic light-emitting chips and planarizes the surface of the array substrate. The upper surface of the inorganic light-emitting chip is exposed and flush with the planarization layer. The pixel definition layer is located on the planarization layer. The pixel definition layer includes multiple sub-pixel pits. The first transparent electrode and quantum dot light-emitting functional layer of each hybrid light-emitting unit are located in the corresponding sub-pixel pit.

5. The display panel as described in claim 4, characterized in that, The array substrate includes multiple sub-pixels, and each sub-pixel corresponds to a hybrid light-emitting unit. The quantum dot light-emitting functional layer of the hybrid light-emitting unit includes a quantum dot layer, which is a red-green hybrid quantum dot layer.

6. The display panel as described in claim 4, characterized in that, The array substrate includes multiple sub-pixels, including red sub-pixels, green sub-pixels, and blue sub-pixels. The multiple hybrid light-emitting units include a first hybrid light-emitting unit and a second hybrid light-emitting unit. The red sub-pixels correspond to the first hybrid light-emitting unit, and the green sub-pixels correspond to the second hybrid light-emitting unit. The quantum dot light-emitting functional layers of the multiple hybrid light-emitting units each include a quantum dot layer. The quantum dot layer of the first hybrid light-emitting unit is a red quantum dot layer, and the quantum dot layer of the second hybrid light-emitting unit is a green quantum dot layer.

7. The display panel as described in claim 6, characterized in that, The plurality of hybrid light-emitting units further includes a third hybrid light-emitting unit, which corresponds to the blue sub-pixel, and the quantum dot layer of the third hybrid light-emitting unit is a red-green hybrid quantum dot layer; or... The display panel also includes a blue inorganic light-emitting unit disposed on the array substrate and electrically connected to the array substrate, wherein the blue inorganic light-emitting unit corresponds to the blue sub-pixel.

8. A method for manufacturing a display panel, characterized in that, include: Provide array substrate; as well as Multiple light-emitting units are formed on the array substrate, and the multiple light-emitting units include a hybrid light-emitting unit; wherein the hybrid light-emitting unit includes: An inorganic light-emitting chip includes a bottom electrode and an inorganic light-emitting functional layer located on one side of the bottom electrode; the inorganic light-emitting chip is a blue Micro-LED chip. The first transparent electrode is connected to the side of the inorganic light-emitting functional layer away from the bottom electrode; A quantum dot light-emitting functional layer is connected to the side of the first transparent electrode away from the inorganic light-emitting chip and is connected in series with the inorganic light-emitting chip; The second transparent electrode is connected to the side of the quantum dot light-emitting functional layer away from the inorganic light-emitting chip; wherein, the first transparent electrode is shared as the cathode of the inorganic light-emitting chip and the anode of the quantum dot light-emitting functional layer to realize the series connection between the quantum dot light-emitting functional layer and the inorganic light-emitting chip; The formation of multiple light-emitting units on the array substrate includes: The inorganic light-emitting chip of the plurality of light-emitting units is transferred to the array substrate, and the bottom electrode is electrically connected to the array substrate; A planarization layer is formed on the array substrate, filling the spaces between the inorganic light-emitting chips and planarizing the array substrate; the planarization layer is processed to expose the upper surface of the inorganic light-emitting chips and make it flush with the planarization layer; A pixel definition layer is formed on the planar layer; the pixel definition layer includes a plurality of sub-pixel pits, and the plurality of sub-pixel pits correspond one-to-one with the plurality of light-emitting units; The first transparent electrode and the quantum dot light-emitting functional layer are sequentially formed in the sub-pixel pit corresponding to the hybrid light-emitting unit; A second transparent electrode is formed on the side of the quantum dot light-emitting functional layer away from the array substrate.

9. The method for manufacturing a display panel as described in claim 8, characterized in that, The step of forming the quantum dot light-emitting functional layer in the sub-pixel pit corresponding to the hybrid light-emitting unit includes: A hole functional layer, a quantum dot layer, and an electronic functional layer are sequentially formed in the sub-pixel pits corresponding to the hybrid light-emitting unit to obtain the quantum dot light-emitting functional layer.

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