Stacked light-emitting units, their fabrication methods, and display panels

Abstract

This invention discloses a stacked light-emitting unit, comprising: a first light-emitting component having a top surface and a bottom surface opposite to each other, and a plurality of side surfaces located between the top surface and the bottom surface; a second light-emitting component stacked on the top surface of the first light-emitting component; a common electrode disposed on a first side surface among the plurality of side surfaces, electrically connected to the negative electrodes of the first light-emitting component and the second light-emitting component respectively, the common electrode extending to the bottom surface; a second electrode disposed on a second side surface among the plurality of side surfaces, the first side surface and the second side surface being different side surfaces, the second electrode being electrically connected to the positive electrode of the second light-emitting component and insulated from the first light-emitting component, the second electrode extending to the bottom surface; and a first electrode disposed at a distance from the common electrode and the second electrode, the first electrode being electrically connected to the positive electrode of the first light-emitting component and insulated from the second light-emitting component. The stacked light-emitting unit disclosed in this invention has the characteristics of improved display resolution, narrow viewing angle display, and low color shift.

Description

Technical Field

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

[0002] Due to their self-emissive nature and lack of backlighting, an increasing number of display panels are adopting new display technologies such as Micro-LED (Micro Light-Emitting Diode) and OLED (Organic Light-Emitting Diode). In these display technologies, each light-emitting unit becomes a sub-pixel. In existing RGB color display panels, each pixel includes light-emitting units of three colors: R (red), G (green), and B (blue), corresponding to the R / G / B sub-pixels respectively. By controlling the light-emitting units corresponding to each sub-pixel, a full-color effect can be achieved. That is, in existing RGB three-color display panels, each pixel needs to be composed of three light points (light-emitting units). If it is a four-color display or other display panels with more colors, each pixel needs to be composed of more light points, and the area occupied by each pixel is also larger. Furthermore, this structure will have a large color shift in narrow viewing angle applications of display panels.

[0003] Therefore, there is an urgent need to provide a new display panel to improve the display performance of existing display panels. Summary of the Invention

[0004] Therefore, in order to overcome at least some of the defects in the prior art, the present invention provides a stacked light-emitting unit, a method for preparing a stacked light-emitting unit, and a display panel, which have the characteristics of improved display resolution, narrow viewing angle display, and low color shift.

[0005] Specifically, in one aspect, an embodiment of the present invention provides a stacked light-emitting unit, comprising: a first light-emitting component having a top surface and a bottom surface opposite to each other, and a plurality of side surfaces located between the top surface and the bottom surface; a second light-emitting component stacked on the top surface of the first light-emitting component; a common electrode disposed on a first side surface among the plurality of side surfaces, electrically connected to the negative electrodes of the first light-emitting component and the second light-emitting component respectively, the common electrode extending to the bottom surface; a second electrode disposed on a second side surface among the plurality of side surfaces, the first side surface and the second side surface being different side surfaces, the second electrode being electrically connected to the positive electrode of the second light-emitting component and insulated from the first light-emitting component, the second electrode extending to the bottom surface; and a first electrode disposed spaced apart from the common electrode and the second electrode, the first electrode being electrically connected to the positive electrode of the first light-emitting component and insulated from the second light-emitting component.

[0006] In one embodiment of the present invention, the stacked light-emitting unit further includes: a third light-emitting component, stacked on the side of the second light-emitting component away from the first light-emitting component; a third electrode, spaced apart from the first electrode, the second electrode, and the common electrode, disposed on a third side of the plurality of sides, the third side being a different side from the first side; the third electrode is electrically connected to the positive electrode of the third light-emitting component, the third electrode is insulated from the first light-emitting component and the second light-emitting component, and extends to the bottom surface. The common electrode is electrically connected to the negative electrode of the third light-emitting component; the first electrode and the second electrode are insulated from the third light-emitting component; the first electrode is disposed on the bottom surface.

[0007] In one embodiment of the present invention, both the first light-emitting component and the second light-emitting component are inorganic light-emitting structures, and the first electrode is disposed on the second side and extends to the bottom surface or is disposed on the bottom surface; or, the second light-emitting component is an inorganic light-emitting structure, the first light-emitting component is an organic light-emitting structure, and the first electrode is disposed on the bottom surface.

[0008] In one embodiment of the present invention, the first light-emitting component, the second light-emitting component, and the third light-emitting component are all inorganic light-emitting structures.

[0009] In one embodiment of the present invention, the second light-emitting component and the third light-emitting component are inorganic light-emitting structures, and the first light-emitting component is an organic light-emitting structure.

[0010] In one embodiment of the present invention, the first light-emitting component is a red light-emitting component, the second light-emitting component is a green light-emitting component, and the third light-emitting component is a blue light-emitting component.

[0011] In one embodiment of the present invention, the second electrode extends to a side adjacent to the second side and extends between the first light-emitting component and the second light-emitting component and between the second light-emitting component and the third light-emitting component; the third electrode extends to a side adjacent to the third side and extends between the first light-emitting component and the second light-emitting component and between the second light-emitting component and the third light-emitting component.

[0012] In one embodiment of the present invention, the first electrode is electrically connected to the positive electrode of the first light-emitting component through an ohmic contact material, the second electrode is electrically connected to the positive electrode of the second light-emitting component through an ohmic contact material, and the common electrode is electrically connected to the negative electrodes of the first light-emitting component and the second light-emitting component through an ohmic contact material.

[0013] On the other hand, another embodiment of the present invention provides a method for fabricating a stacked light-emitting unit, comprising: providing a plurality of light-emitting chips, each of the light-emitting chips comprising: a light-emitting component having a top surface and a bottom surface opposite to each other, and a plurality of side surfaces located between the top surface and the bottom surface; a negative electrode electrically connected to the negative electrode of the light-emitting component and disposed on a first side surface among the plurality of side surfaces of the light-emitting component; and a positive electrode electrically connected to the positive electrode of the light-emitting component; the plurality of light-emitting chips includes a first light-emitting chip and a second light-emitting chip, the first light-emitting chip further comprising a first connecting electrode disposed on a second side surface among the plurality of side surfaces, the first side surface and the second side surface being different side surfaces, the first connecting electrode being insulated from the first light-emitting component of the first light-emitting chip, and the positive electrode of the first light-emitting chip extending to the bottom surface of the first light-emitting chip;

[0014] The second light-emitting chip is stacked on the top surface of the first light-emitting chip, such that the negative electrode of the first light-emitting chip and the negative electrode of the second light-emitting chip abut and are electrically connected to form a common electrode; and the positive electrode of the second light-emitting chip abuts and is electrically connected to the first connecting electrode of the first light-emitting chip to form a second electrode.

[0015] In one embodiment of the present invention, the plurality of light-emitting chips further includes a third light-emitting chip, the first light-emitting chip further includes a second connecting electrode spaced apart from the first connecting electrode, the second connecting electrode being insulated from the first light-emitting component of the first light-emitting chip and extending to the bottom surface of the first light-emitting chip, the second light-emitting chip further includes a third connecting electrode aligned with the second connecting electrode, the third connecting electrode being insulated from the second light-emitting component of the second light-emitting chip, and the method for preparing the stacked light-emitting unit further includes: stacking the third light-emitting chip on the side of the second light-emitting chip away from the first light-emitting chip, such that the second connecting electrode, the third connecting electrode and the positive electrode of the third light-emitting chip are stacked sequentially to form a third electrode, and the negative electrode of the third light-emitting chip abuts against and is electrically connected to the negative electrode of the second light-emitting chip.

[0016] In one embodiment of the present invention, the first light-emitting chip is an organic light-emitting chip, the second light-emitting chip is an inorganic light-emitting chip, and the method for preparing the stacked light-emitting unit includes: depositing the first light-emitting chip on a substrate by vapor deposition; transferring and connecting the prepared second light-emitting chip to the top surface of the first light-emitting chip, so that the second light-emitting chip is stacked on the first light-emitting chip.

[0017] On the other hand, another embodiment of the present invention provides a display panel, including: an array substrate; and a stacked light-emitting unit as described in any of the foregoing embodiments, disposed on the array substrate and electrically connected to the array substrate.

[0018] In one embodiment of the present invention, the display panel further includes a condensing lens, which is disposed opposite to the array substrate, and the stacked light-emitting unit is located between the condensing lens and the array substrate and is disposed corresponding to the condensing lens.

[0019] As can be seen from the above, the above embodiments of the present invention can achieve one or more of the following beneficial effects: multiple light-emitting components are stacked sequentially and form corresponding electrical connections, so that multiple light-emitting components can emit light in the same position and can independently control the light emission, thereby reducing the area occupied by the light-emitting unit, achieving high-resolution display, and achieving the effect of narrow light emission and low color shift.

[0020] 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

[0021] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0022] Figure 1 This is a bottom view schematic diagram of a stacked light-emitting unit according to an embodiment of the present invention.

[0023] Figure 2 for Figure 1 Section 1-1;

[0024] Figure 3 for Figure 1 Section 2-2;

[0025] Figure 4 for Figure 1 Another embodiment of the 1-1 cross-sectional view;

[0026] Figure 5 This is a top view of the structure of the second light-emitting chip in one embodiment of the present invention;

[0027] Figure 6 for Figure 5 Section 3-3;

[0028] Figure 7 for Figure 5 Section 4-4;

[0029] Figure 8 This is a bottom view of the structure of the first light-emitting chip in one embodiment of the present invention;

[0030] Figure 9 for Figure 8 Section 5-5;

[0031] Figure 10 This is a top view of the third light-emitting chip in one embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram of the structure of a display panel provided in one embodiment of the present invention.

[0033] [Explanation of Labels in the Attached Image]

[0034] 100: Stacked light-emitting unit; 101: Top surface; 102: Bottom surface; 103: Side surface; 1031: First side surface;

[0035] 1032: Second side surface; 1033: Third side surface; 10: First light-emitting component; 20: Second light-emitting component; 30: Third light-emitting component; 40: Common electrode; 50: First electrode; 60: Second electrode; 70: Third electrode; 200: Light-emitting chip; 210: Light-emitting component; 220: Negative electrode; 230: Positive electrode; 240: First connecting electrode; 250: Second connecting electrode; 260: Third connecting electrode; 201: First light-emitting chip; 202: Second light-emitting chip; 203: Third light-emitting chip; 300: Display panel; 301: Array substrate; 302: Condensing lens. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] [First Embodiment]

[0041] like Figure 1 As shown, it is a bottom view schematic diagram of a stacked light-emitting unit 100 provided in an embodiment of the present invention. Figure 2 for Figure 1 Section 1-1 Figure 3 for Figure 1 As shown in section 2-2, an embodiment of the present invention provides a stacked light-emitting unit 100 including a first light-emitting component 10, a second light-emitting component 20, a common electrode 40, a first electrode 50, and a second electrode 60. The first light-emitting component 10 has a top surface 101 and a bottom surface 102 opposite to each other, and a plurality of side surfaces 103 located between the top surface 101 and the bottom surface 102. The second light-emitting component 20 is stacked on the top surface 101 of the first light-emitting component 10. The common electrode 40 is disposed on the first side surface 1031 of the plurality of side surfaces 103, respectively connecting and conducting to the negative electrodes of the first light-emitting component 10 and the second light-emitting component 20. The second electrode 60 is disposed on the second side surface 1032 of the plurality of side surfaces 103, the first side surface 1031 and the second side surface 1032 being different sides. The second electrode 60 is electrically connected to the positive electrode of the second light-emitting component 20 and is insulated from the first light-emitting component 10. The second electrode 60 extends to the bottom surface 102 of the first light-emitting component 10. (Refer to the following...) Figure 1 , Figure 2 and Figure 3 The stacked light-emitting unit 100 provided in this embodiment will be further described.

[0042] For example, refer to Figure 1 , Figure 2 and Figure 3 The first light-emitting group of 10 pieces has a hexahedral structure with four sides 103, for example, refer to Figure 2 The first side 1031 is the right side 103 of the first light-emitting component 10, and the second side 1032 is the left side 103 of the first light-emitting component 10. The first side 1031 and the second side 1032 are two opposite sides. Of course, in other embodiments, the first side 1031 and the second side 1032 may be adjacent sides, for example, the first side 1031 may be the right side 103, and the second side 1032 may be the front or rear side 103. This embodiment is not limited to this.

[0043] The first light-emitting component 10 and the second light-emitting component 20 are used, for example, to emit light of different colors, and include a light-emitting functional layer and an insulating protective layer surrounding the light-emitting functional layer, for example... Figure 2 , Figure 3 The unfilled portion of the first light-emitting component 10 is a light-emitting functional layer, and the single-line filled portion is an insulating protective layer. The insulating protective layer can achieve insulation between the second electrode 60 and the first light-emitting component 10, as well as insulation between the first electrode 50 and the second light-emitting component 20 (when the first electrode 50 is located on the side 103). The insulating protective layer has openings corresponding to the positive and negative positions of the first light-emitting component 10 and the second light-emitting component 20, so that the common electrode 40 can be electrically connected to the negative electrode of the first light-emitting component 10 and the second light-emitting component 20 through the openings, the first electrode 50 can be connected to the positive electrode of the first light-emitting component 10, and the second electrode 60 can be connected to the positive electrode of the second light-emitting component 20. The first light-emitting component 10 can be, for example, an inorganic light-emitting structure or an organic light-emitting structure. The second light-emitting component 20 is, for example, an inorganic light-emitting structure. When either the first or second light-emitting component 10 is an inorganic light-emitting structure, its light-emitting functional layer includes an N-doped semiconductor layer, a quantum well layer, and a P-doped semiconductor layer stacked sequentially. The P-doped semiconductor layer is the positive electrode of the first light-emitting component 10, and the N-doped semiconductor layer is the negative electrode of the first light-emitting component 10. For example, an ITO film layer is also disposed on the P-doped and N-doped semiconductor layers as an ohmic contact material to form an ohmic contact connection. When the first light-emitting component 10 is, for example, an organic light-emitting structure, its light-emitting functional layer includes a hole injection layer (HIL), a hole transport layer (HTL), an emissive layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL) stacked sequentially. The hole injection layer is the positive electrode of the first light-emitting component 10, and the electron injection layer is the negative electrode of the first light-emitting component 10. (Refer to...) Figure 4 This is a cross-sectional view (1-1) of the first light-emitting component 10, which is an organic light-emitting structure. Figure 2 The diagram at 1-1 shows a cross-sectional view of the first light-emitting component 10, which is an inorganic light-emitting structure and has an inverted structure. This is merely an illustrative example of the structure of the first light-emitting component 10 and should not be considered a limitation of this embodiment.

[0044] The common electrode 40, the first electrode 50, and the second electrode 60 can be, for example, common metal electrode materials such as Ni (nickel), Pt (platinum), and Au (gold), and can be single-layer or multi-layer; this embodiment is not limited in this regard. The first electrode 50 can be, for example, as shown in the image. Figure 2 and Figure 3 The bottom surface 102 of the first light-emitting component 10 shown can also be located on the side surface 103 (not shown), and this embodiment is not limited thereto. For example... Figure 2 and Figure 3 The structure shown is a three-layer stacked structure. In this embodiment, the first light-emitting component 10 and the second light-emitting component 20 are respectively the first and second layers from bottom to top of the three-layer stacked structure. Of course, in other embodiments of the present invention, the first light-emitting component 10 and the second light-emitting component 20 can be referred to as... Figure 3 The second and third layers of the three-layer stacked structure shown are not limited in this embodiment. Similarly, this embodiment does not limit the number of layers in the stacked light-emitting unit 100; it may also include, for example... Figure 2 , Figure 3 The diagram shows three-layer stacks, or even four-layer stacks or more. The common electrode 40, the first electrode 50, and the second electrode 60 all extend to the bottom surface 102 of the first light-emitting component 10, which facilitates the welding of the stacked light-emitting unit 100.

[0045] In the stacked light-emitting unit 100 provided in this embodiment, the first light-emitting component 10 and the second light-emitting component 20 are used to emit light of different colors, for example, the first light-emitting component 10 emits red light and the second light-emitting component 20 emits green light. When the stacked light-emitting unit 100 of this embodiment is working, the common electrode 40 and the first electrode 50 can be energized while the second electrode 60 is not energized. In this case, the first light-emitting component 10 is energized and emits red light, while the second light-emitting component 20 does not emit light, and the stacked light-emitting unit 100 emits red light. Alternatively, the common electrode 40 and the second electrode 60 can be energized while the first electrode 50 is not energized. In this case, the first light-emitting component 10 does not emit light, the second light-emitting component 20 emits green light, and the stacked light-emitting unit 100 emits green light. Or, both the first electrode 50 and the second electrode 60 can be energized with the common electrode 40. In this case, the red light emitted by the first light-emitting component 10 and the green light emitted by the second light-emitting component 20 mix, causing the stacked light-emitting unit 100 to emit mixed red and green light. Of course, the above is just an example, and this embodiment does not limit the specific light emission colors of the first light-emitting component 10 and the second light-emitting component 20. This embodiment uses a stacked structure of the first light-emitting component 10 and the second light-emitting component 20, and the first light-emitting component 10 and the second light-emitting component 20 can emit light independently when powered on, so that each stacked light-emitting unit 100 can achieve multiple light emission modes. Compared with traditional light-emitting structures, the area occupied by each chip on the display panel can be reduced, which is beneficial to achieving high-resolution display.

[0046] Furthermore, in one embodiment, the stacked light-emitting unit 100 further includes, for example, a third light-emitting component 30 and a third electrode 70. The third light-emitting component 30 is stacked on the side of the second light-emitting component 20 away from the first light-emitting component 10. The third electrode 70 is spaced apart from the first electrode 50, the second electrode 60, and the common electrode 40, and is disposed on a third side 1033 among a plurality of sides 103. The third side 1033 is a different side from the first side 1031. The third electrode 70 is electrically connected to the positive electrode of the third light-emitting component 30, and the common electrode 40 is connected to the negative electrode of the third light-emitting component 30. The third electrode 70 is insulated from the first light-emitting component 10 and the second light-emitting component 20 and extends to the bottom surface 102 of the first light-emitting component 10. The third side 1033 and the second side 1032 can be the same side or different sides, for example, Figure 2 and Figure 3 As shown, the third side 1033 and the second side 1032 are both the left side of the first light-emitting component 10, referring to... Figure 1 The orientation of the second electrode 60, for example, is located at... Figure 1 The third electrode 70 is located, for example, in the lower left corner. Figure 1The upper left corner. In other embodiments of the present invention, for example, the first side 1031 may be the right side of the first light-emitting component 10, the second side 1032 may be the front side of the first light-emitting component 10, and the third side 1033 may be the rear side of the first light-emitting component 10. This embodiment is not limited. The first electrode 50 may be disposed on the bottom surface 102 of the first light-emitting component 10, or it may be disposed on a side different from the first side 1031, as long as it is spaced apart from the second electrode 60 and the third electrode 70. The third light-emitting component 70 may be an inorganic light-emitting structure, as described above, where the first light-emitting component 10 and the second light-emitting component 20 are inorganic light-emitting structures. The third light-emitting component 70 may be used to emit light of a different color than the first light-emitting component 10 and the second light-emitting component 20. Specifically, for example, when applied to an RGB three-color full-color display panel, the first light-emitting component 10, the second light-emitting component 20, and the third light-emitting component 70 each emit one of red, blue, and green light, or other color combinations. Since red inorganic light-emitting structures generally use gallium arsenide semiconductors, which have poor light transmittance, it is preferable that the first light-emitting component 10 in the RGB combination is a red light-emitting component, the second light-emitting component 20 is a green light-emitting component, and the third light-emitting component 70 is a blue light-emitting component to ensure the light emission effect of the stacked light-emitting unit 100. Applying the stacked light-emitting unit 100 of this embodiment to an RGB three-color display panel, only one stacked light-emitting unit 100 is needed for the original three RGB sub-pixel lamp positions. This is equivalent to reducing the area occupied by each pixel position to about one-third of the original, thus increasing the resolution and facilitating high-resolution display. Furthermore, since the RGB light in each pixel is emitted from the same lamp position, it helps to improve the color shift phenomenon caused by the RGB light emitting from different positions in existing displays. This embodiment can also be referenced when the stacked light-emitting unit 100 provided by this invention has four or more layers.

[0047] Furthermore, in one embodiment, reference is made to... Figure 1 , Figure 2 and Figure 3 The second electrode 60 extends to the side 103 adjacent to the second side 1032, and extends between the first light-emitting component 10 and the second light-emitting component 20, and between the second light-emitting component 20 and the third light-emitting component 30, and may also extend to the side of the third light-emitting component 30 away from the second light-emitting component 20. The third electrode 70 extends to the side adjacent to the third side 1033, and extends between the first light-emitting component 10 and the second light-emitting component 20, and between the second light-emitting component 20 and the third light-emitting component 30. The common electrode 40 also extends, for example, between the first light-emitting component 10 and the second light-emitting component 20, and between the second light-emitting component 20 and the third light-emitting component 30. The second side 1032 is, for example, to the left of the first light-emitting component 10 (…). Figure 1If the second electrode 60 extends to the side 103 adjacent to the left (e.g., the lower left side), then the second electrode 60 also extends to the side 103 adjacent to the left side (e.g., the lower left side). Figure 1 The top of the middle corresponds to Figure 2 That is, the front), the third side 1033 is, for example, the left side of the first light-emitting component 10 (i.e., the front), the third side 1033 is, for example, the left side of the first light-emitting component 10 ( Figure 1 The third electrode 70 extends to the side 103 adjacent to the left side (top left). Figure 1 The bottom of the middle corresponds to Figure 3 (The area behind). This embodiment can increase the area of ​​the common electrode 40, the second electrode 60, and the third electrode 70, resulting in better conductivity. It should be noted that when the first electrode 50 is also located on the side 103, for example, it can adopt an extension method similar to that of the second electrode 60 or the third electrode 70, which will not be described in detail in this embodiment.

[0048] [Second Embodiment]

[0049] The second embodiment of the present invention provides a method for fabricating a stacked light-emitting unit, which includes, for example:

[0050] Step S1: Provide multiple light-emitting chips; for example, Figure 5 or Figure 8 The illustrated light-emitting chip 200 includes a light-emitting component 210, a negative electrode 220, and a positive electrode 230. The light-emitting component 210 has a top surface 101 and a bottom surface 102 facing each other, and a plurality of side surfaces 103 located between the top surface 101 and the bottom surface 102. The negative electrode 220 is electrically connected to the negative electrode of the light-emitting component 210 and is disposed on a first side surface 1031 among the plurality of side surfaces 103. The positive electrode 230 is electrically connected to the positive electrode of the light-emitting component 210. The plurality of light-emitting chips 200 include a first light-emitting chip 201 and a second light-emitting chip 202. The first light-emitting chip 201 also includes a first connecting electrode 240. The first connecting electrode 240 is disposed on a second side 1032 among a plurality of side surfaces 103. The second side 1032 and the first side 1031 are different sides. The first connecting electrode 240 is insulated from the first light-emitting component 10 of the first light-emitting chip 201. The positive electrode 230 of the first light-emitting chip 201 extends to the bottom surface 102 of the first light-emitting component 10 of the first light-emitting chip 201.

[0051] Step S2: Stack the second light-emitting chip 202 on the top surface 101 of the first light-emitting chip 201, so that the negative electrode 220 of the first light-emitting chip 201 and the negative electrode 220 of the second light-emitting chip 202 abut and are electrically connected to form a common electrode 40, and make the positive electrode 230 of the second light-emitting chip 202 abut and be electrically connected to the first connection electrode 240 of the first light-emitting chip 201 to form a second electrode 60.

[0052] Please refer to Figure 8This is a bottom view of the structure of the first light-emitting chip 201 provided in one embodiment of the present invention. Figure 9 for Figure 8 Sectional view 5-5 (or 6-6) in the diagram. Figure 5 This is a top view of the second light-emitting chip 202 provided in one embodiment of the present invention. Figure 6 for Figure 5 Sectional view 3-3, Figure 7 for Figure 5 A 4-4 cross-sectional view shows that the positive electrode 230 of the first light-emitting chip 201 is disposed, for example, on the bottom surface 102 of the first light-emitting component 10, while the positive electrode 230 of the second light-emitting chip 202 is disposed, for example, on the second side surface 1032. Of course, this embodiment is not limited, and in some embodiments, the positive electrode 230 of the first light-emitting chip 201 may also be disposed on the side surface 103. The method for preparing the stacked light-emitting unit provided in this embodiment can be used to prepare the stacked light-emitting unit 100 as described in the first embodiment. The description of the first light-emitting component 10, the second light-emitting component 20, the common electrode 40, and the second electrode 60 can be referred to the description in the first embodiment, and will not be repeated here. In the preparation method of this embodiment, the positive electrode 230 of the first light-emitting chip 201 is disposed, for example, on the bottom surface 102 of the first light-emitting component 10, and the positive electrode 230 of the first light-emitting chip 201 is equivalent to the first electrode 50 in the stacked light-emitting unit 100. When the positive electrode 230 of the first light-emitting chip 201 is disposed on the side 103 of the first light-emitting component 10, it can form the first electrode 50 of the stacked light-emitting unit 100 together with the electrode material at the corresponding position on the second light-emitting chip 202. Of course, the first electrode 50 is insulated from the second light-emitting component 20.

[0053] Furthermore, in one embodiment, the plurality of light-emitting chips 200 may further include, for example, a third light-emitting chip 203. The first light-emitting chip 201 may further include a second connecting electrode 250 spaced apart from the first connecting electrode 240. The second connecting electrode 250 is insulated from the first light-emitting component 10 of the first light-emitting chip 201 and extends to the bottom surface 102 of the first light-emitting chip 201. The second light-emitting chip 202 may further include, for example, a third connecting electrode 260 aligned with the second connecting electrode 250. The third connecting electrode 260 is insulated from the second light-emitting component 20 of the second light-emitting chip 202. The method for fabricating the stacked light-emitting unit may further include step S3: stacking the third light-emitting chip 203 on the side of the second light-emitting chip 202 away from the first light-emitting chip 201, such that the second connecting electrode 250, the third connecting electrode 260, and the positive electrode 230 of the third light-emitting chip 203 are stacked sequentially to form a third electrode 70, and the negative electrode 220 of the third light-emitting chip 203 abuts against and is electrically connected to the negative electrode 220 of the second light-emitting chip 202. For example, see reference. Figure 10This is a top view of the third light-emitting chip 203 in one embodiment of the present invention. It can be seen that its positive electrode 230 is aligned with the third connecting electrode 260 in the second light-emitting chip 202.

[0054] Furthermore, in some embodiments of the present invention, the first light-emitting chip 201 can be an organic light-emitting chip, such as an OLED chip, or an inorganic light-emitting chip, such as a Micro-LED chip, and the second light-emitting chip 202 and the third light-emitting chip 203 can be inorganic light-emitting chips, for example. Then, the method for fabricating the stacked light-emitting unit includes:

[0055] Step S11: Deposit the first light-emitting chip on the substrate;

[0056] Step S21: Transfer the prepared second light-emitting chip to the top surface of the first light-emitting chip so that the second light-emitting chip is stacked on the first light-emitting chip.

[0057] For example, it may also include step S31: transferring the prepared third light-emitting chip to the top surface of the second light-emitting chip away from the first light-emitting chip, so that the third light-emitting chip is stacked on the second light-emitting chip.

[0058] The substrate in step S11 is, for example, an array substrate of a display panel, on which a driving circuit layer for driving the stacked light-emitting units to emit light is disposed. The first light-emitting component of the first light-emitting chip is, for example, an organic light-emitting component, including a hole injection layer (HIL), a hole transport layer (HTL), an emissive layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL) stacked in sequence, which can be formed sequentially by a vapor deposition process.

[0059] The second embodiment of the present invention can be used to prepare the stacked light-emitting unit 100 as described in the first embodiment, which has the same beneficial effects as the first embodiment and the process is simple.

[0060] [Third Embodiment]

[0061] Reference Figure 11 This invention provides a display panel 300, including an array substrate 301 and a stacked light-emitting unit 100. The stacked light-emitting unit 100 can be any of the types described in the first embodiment above, and is disposed on and electrically connected to the array substrate 301. The array substrate 301, for example, has a driving circuit layer for driving the stacked light-emitting unit 100. The driving circuit layer may include, for example, wirings (e.g., data lines, scan lines), TFT (Thin Film Transistor) transistors, capacitors, and other suitable components. (See reference...) Figure 11This illustration shows three stacked light-emitting units 100 disposed on a substrate 301. Of course, this embodiment is merely illustrative and does not limit the number of stacked light-emitting units 100. When the stacked light-emitting units 100 are disposed on the array substrate 301, the mounting direction is, for example, such that the first light-emitting component 10 is adjacent to the array substrate 301, and the second light-emitting component 10 is located on the side of the first light-emitting component 10 away from the array substrate 301. The stacked light-emitting units 100 extend to the bottom surface 102 of the first light-emitting component 10 via a common electrode 40, a first electrode 50, and a second electrode 60, respectively, and are electrically connected to the driving circuit layer on the array substrate 301. For example, the first electrode 50 and the second electrode 60 are respectively electrically connected to different TFT thin-film transistors, and the common electrode 40 is connected to a common electrode on the driving circuit layer, so as to realize the separate control and driving of the first light-emitting component 10 and the second light-emitting component 20. When the stacked light-emitting unit 100 also has a third light-emitting component 30 and a third electrode 70, the third electrode 70 extends to a portion of the bottom surface 102 of the first light-emitting component 10 and is electrically connected to another different TFT thin-film transistor on the driving circuit layer of the array substrate 301, so as to realize the separate control and driving of the first light-emitting component 10, the second light-emitting component 20 and the third light-emitting component 30. Specifically, taking RGB display as an example, in one embodiment, for example, the first light-emitting component 10 is a red light-emitting component, the second light-emitting component 20 is a green light-emitting component and the third light-emitting component 30 is a blue light-emitting component. Thus, corresponding to each position of the stacked light-emitting unit 100 on the display panel 300, by independently controlling different light-emitting components to emit light, various color effects such as red light, green light, blue light, red-green mixed light, blue-green mixed light, red-blue mixed light, and white light can be achieved. For existing RGB display panels, each pixel position requires three LEDs (R, G, B). The display panel 300 provided in this embodiment only needs one stacked light-emitting unit 100 per pixel position to achieve RGB full-color effect. The area occupied by each LED at each pixel position is approximately one-third of the original, enabling higher resolution display. Furthermore, the existing RGB display panel structure, where each pixel position emits three colors of light from three different positions, results in different mixing effects of the three colors of light at different viewing angles (left-hand, right-hand, or center), leading to significant color shift. In contrast, the display panel 300 provided in this embodiment emits all three colors of light from the same position, greatly reducing color shift. Of course, this embodiment does not limit the number of stacked light-emitting units 100 layers; more layers can achieve a smaller footprint and higher resolution.

[0062] Furthermore, in another embodiment of the present invention, the display panel 300 further includes a condenser lens 302, such as... Figure 11 As shown, the condenser lens 302 is disposed opposite to the array substrate 301, and the stacked light-emitting unit 100 is located between the condenser lens 302 and the array substrate 301, corresponding to the condenser lens 302. For example Figure 11The three stacked light-emitting units 100 shown in the figure are each located at a condenser lens 302. The condenser lens 302 can further limit the light emission angle of the stacked light-emitting units 100 to achieve a narrow light emission effect.

[0063] The third embodiment of the present invention uses the stacked light-emitting unit 100 provided in the first embodiment, and has at least the same beneficial effects as the first embodiment, which will not be described again here.

[0064] 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 stacked light-emitting unit, characterized in that, include: Multiple light-emitting chips, a first electrode, a second electrode, and a common electrode; Each of the light-emitting chips includes: A light-emitting component having opposing top and bottom surfaces, and a plurality of side surfaces located between the top and bottom surfaces; The negative electrode is electrically connected to the negative electrode of the light-emitting component; the negative electrode is disposed on a first side of a plurality of sides of the light-emitting component, and includes a first portion extending to the bottom surface on the side opposite to the top surface and a second portion extending to the top surface on the side opposite to the bottom surface; Positive electrode, electrically connected to the positive electrode of the light-emitting component; The plurality of light-emitting chips include a first light-emitting chip and a second light-emitting chip, wherein the light-emitting component corresponding to the first light-emitting chip is a first light-emitting component; and the light-emitting component corresponding to the second light-emitting chip is a second light-emitting component. The first light-emitting chip further includes a first connecting electrode, which is disposed on a second side among a plurality of sides of the first light-emitting component; the first side and the second side are different sides; the first connecting electrode is insulated from the first light-emitting component of the first light-emitting chip; the first connecting electrode includes a third portion extending to the bottom surface of the first light-emitting component facing away from the top surface and a fourth portion extending to the top surface of the first light-emitting component facing away from the bottom surface; The positive electrode of the second light-emitting chip abuts against and is electrically connected to the first connecting electrode; the positive electrode of the second light-emitting chip is disposed on the second side of the second light-emitting component, and includes a fifth portion extending to the bottom surface of the second light-emitting component away from the top surface and a sixth portion extending to the top surface of the second light-emitting component away from the bottom surface; The second light-emitting component is stacked on top of the first light-emitting component; The second portion of the negative electrode of the first light-emitting chip and the first portion of the negative electrode of the second light-emitting chip are connected so that the negative electrodes of the first light-emitting chip and the second light-emitting chip together constitute the common electrode, and the first portion of the negative electrode of the first light-emitting chip constitutes the portion of the common electrode extending to the bottom surface of the first light-emitting component. The fourth and fifth parts are connected such that the first connecting electrode and the positive electrode of the second light-emitting chip together constitute the second electrode, and the third part constitutes the portion of the second electrode extending to the bottom surface of the first light-emitting component; The positive electrode of the first light-emitting chip is disposed at an interval from the common electrode and the second electrode, and the first electrode is insulated from the second light-emitting component.

2. The stacked light-emitting unit as described in claim 1, characterized in that, The first light-emitting chip further includes a second connecting electrode spaced apart from the first connecting electrode, the second connecting electrode being insulated from the first light-emitting component; the second connecting electrode is disposed on a third side of the first light-emitting component, and includes a seventh portion extending to the bottom surface of the first light-emitting component facing away from the top surface and an eighth portion extending to the top surface of the first light-emitting component facing away from the bottom surface; the third side is not the same side as the first side. The second light-emitting chip further includes a third connecting electrode aligned with the second connecting electrode, the third connecting electrode being insulated from the second light-emitting component; the third connecting electrode is disposed on a third side of the second light-emitting chip, and includes a ninth portion extending to the bottom surface of the second light-emitting component facing away from the top surface and a tenth portion extending to the top surface of the second light-emitting component facing away from the bottom surface; The stacked light-emitting unit further includes a third electrode, which is spaced apart from the first electrode, the second electrode and the common electrode; The plurality of light-emitting chips also includes a third light-emitting chip, and the light-emitting component corresponding to the third light-emitting chip is a third light-emitting component; the positive electrode of the third light-emitting chip is disposed on the third side of the third light-emitting component and aligned with the third connecting electrode, and includes an eleventh part extending to the bottom surface of the third light-emitting component away from the top surface and a twelfth part extending to the top surface of the third light-emitting component away from the bottom surface; The third light-emitting component is stacked on the side of the second light-emitting component away from the first light-emitting component; the eighth part is connected to the ninth part; the tenth part is connected to the eleventh part such that the second connecting electrode, the third connecting electrode and the positive electrode of the third light-emitting chip together constitute the third electrode, and the seventh part constitutes the portion of the third electrode extending to the bottom surface of the first light-emitting component; The first part of the negative electrode of the third light-emitting chip is connected to the second part of the negative electrode of the second light-emitting chip, and the negative electrodes of the first light-emitting chip, the second light-emitting chip and the third light-emitting chip together constitute the common electrode; The first electrode and the second electrode are insulated from the third light-emitting component; the first electrode is disposed on the bottom surface.

3. The stacked light-emitting unit as described in claim 1, characterized in that, Both the first and second light-emitting components are inorganic light-emitting structures. The first electrode is disposed on the second side and extends to the bottom surface, or is disposed on the bottom surface; or... The second light-emitting component is an inorganic light-emitting structure, the first light-emitting component is an organic light-emitting structure, and the first electrode is disposed on the bottom surface.

4. The stacked light-emitting unit as described in claim 2, characterized in that, The first light-emitting component, the second light-emitting component, and the third light-emitting component are all inorganic light-emitting structures.

5. The stacked light-emitting unit as described in claim 2, characterized in that, The second and third light-emitting components are inorganic light-emitting structures, while the first light-emitting component is an organic light-emitting structure.

6. The stacked light-emitting unit as described in claim 2, characterized in that, The first light-emitting component is a red light-emitting component, the second light-emitting component is a green light-emitting component, and the third light-emitting component is a blue light-emitting component.

7. The stacked light-emitting unit as described in claim 1, characterized in that, The first electrode is electrically connected to the positive electrode of the first light-emitting component through an ohmic contact material, the second electrode is electrically connected to the positive electrode of the second light-emitting component through an ohmic contact material, and the common electrode is electrically connected to the negative electrodes of the first light-emitting component and the second light-emitting component through an ohmic contact material.

8. A method for fabricating a stacked light-emitting unit, characterized in that, include: A plurality of light-emitting chips are provided, each of the light-emitting chips comprising: a light-emitting component having a top surface and a bottom surface opposite to each other, and a plurality of side surfaces located between the top surface and the bottom surface; a negative electrode electrically connected to the negative electrode of the light-emitting component, the negative electrode being disposed on a first side surface among the plurality of side surfaces of the light-emitting component, and including a first portion extending to the bottom surface on a side facing away from the top surface and a second portion extending to the top surface on a side facing away from the bottom surface; and a positive electrode electrically connected to the positive electrode of the light-emitting component; the plurality of light-emitting chips include a first light-emitting chip and a second light-emitting chip, the light-emitting component corresponding to the first light-emitting chip being a first light-emitting component; the light-emitting component corresponding to the second light-emitting chip being a second light-emitting component; the first light-emitting chip further comprising a first connecting electrode disposed on a second side surface among the plurality of side surfaces of the first light-emitting component, the first side surface and the second side surface being different sides, the first connecting electrode being insulated from the first light-emitting component of the first light-emitting chip, the first connecting electrode including a third portion extending to the bottom surface of the first light-emitting component on a side facing away from the top surface and a fourth portion extending to the top surface of the first light-emitting component on a side facing away from the bottom surface; The positive electrode of the first light-emitting chip extends to the bottom surface of the first light-emitting component; The positive electrode of the second light-emitting chip is disposed on the second side of the second light-emitting component, and includes a fifth portion extending to the bottom surface of the second light-emitting component away from the top surface and a sixth portion extending to the top surface of the second light-emitting component away from the bottom surface; The second light-emitting chip is transferred and stacked on the top surface of the first light-emitting chip, such that the second part of the negative electrode of the first light-emitting chip abuts and is electrically connected to the first part of the negative electrode of the second light-emitting chip to form a common electrode; and the fifth part of the positive electrode of the second light-emitting chip abuts and is electrically connected to the fourth part of the first connecting electrode of the first light-emitting chip to form a second electrode.

9. A display panel, characterized in that, include: Array substrate; The stacked light-emitting unit as described in any one of claims 1-7 is disposed on the array substrate and electrically connected to the array substrate.

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