CN116259618A - Laminated light-emitting unit, preparation method thereof and display panel - Google Patents

Abstract

A laminated light-emitting unit disclosed in an embodiment of the present invention includes: a first light-emitting component having opposite top and bottom surfaces, and a plurality of side surfaces located between the top and bottom surfaces; a second light-emitting component stacked on the first The top surface of the light-emitting component; the common electrode is arranged on the first side of the multiple sides, and is electrically connected to the negative electrodes of the first light-emitting component and the second light-emitting component respectively, and the common electrode extends to the bottom surface; the second electrode is arranged on the multiple sides In the second side, the first side and the second side are respectively different sides, the second electrode is electrically connected to the anode of the second light-emitting component and insulated from the first light-emitting component, and the second electrode extends to the bottom surface; the first electrode is connected to the common The electrode and the second electrode are spaced apart, and the first electrode is electrically connected to the anode of the first light-emitting component and insulated from the second light-emitting component. The laminated light-emitting unit disclosed by the invention has the characteristics of improved display resolution, narrow viewing angle display, low color shift and the like.

Description

Laminated light-emitting unit and its preparation method and display panel

technical field

The invention relates to the field of display technology, in particular to a laminated light-emitting unit, a method for preparing a laminated light-emitting unit and a display panel.

Background technique

Due to the characteristics of self-illumination without backlight, more and more display panels choose to use such as Micro-LED (Micro Light-Emitting Diode, micron light-emitting diode) display and OLED (Organic Light-Emitting Diode, organic light-emitting diode) display, etc. New display technology. In this type of display technology, each light-emitting unit will become a sub-pixel. In the existing RGB color display panel, for example, each pixel includes R (red), G (green) and B (blue). The light-emitting units of the colors correspond to the R/G/B three-color sub-pixels, and the full-color effect can be realized by controlling the light-emitting units corresponding to each sub-pixel, that is, each pixel in the existing RGB three-color display panel needs to be composed of three If it is a display panel with more colors such as four-color display, each pixel needs to be composed of more light points, and the area occupied by each pixel is also larger, and this The structure will have a large color shift in the narrow viewing angle application of the display panel.

Therefore, it is urgent to provide a new display panel to improve the display effect of the existing display panel.

Contents of the invention

Therefore, in order to overcome at least some of the defects in the prior art, embodiments of the present invention provide a laminated light-emitting unit, a method for manufacturing a laminated light-emitting unit, and a display panel, which have the advantages of improved display resolution, narrow viewing angle display and Features such as low color cast.

Specifically, in one aspect, an embodiment of the present invention provides a laminated light-emitting unit, comprising: a first light-emitting component having opposite top surfaces and bottom surfaces, 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 the first side of the plurality of sides, electrically connected to the first light emitting component and the second light emitting component respectively The negative electrode of the light-emitting component, the common electrode extends to the bottom surface; the second electrode is arranged on the second side of the plurality of sides, the first side and the second side are respectively different sides, so The second electrode is electrically connected to the anode of the second light-emitting component and is insulated from the first light-emitting component, and the second electrode extends to the bottom surface; the first electrode is connected to the common electrode and the second electrode The first electrodes are arranged at intervals, and the first electrodes are electrically connected to the anode of the first light-emitting component and insulated from the second light-emitting component.

In an embodiment of the present invention, the stacked light-emitting unit further includes: a third light-emitting component stacked on a side of the second light-emitting component away from the first light-emitting component; a third electrode connected to the first light-emitting component An electrode, the second electrode, and the common electrode are arranged at intervals, and are arranged on a third side of the plurality of sides, and the third side is a different side from the first side; the third electrode Electrically connected to the anode 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 arranged on the bottom surface.

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 arranged on the second side and extends to the bottom surface or is arranged on the 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.

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.

In an 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.

In an 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.

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

In one embodiment of the present invention, the first electrode is electrically connected to the anode of the first light-emitting component through an ohmic contact material, and the second electrode is electrically connected to the anode of the second light-emitting component through an ohmic contact material , 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.

On the other hand, another embodiment of the present invention provides a method for manufacturing a laminated light-emitting unit, including: providing a plurality of light-emitting chips, each of which includes: a light-emitting component having opposite top and bottom surfaces, and a Multiple sides between the top surface and the bottom surface, the negative electrode is electrically connected to the negative electrode of the light-emitting component, and is arranged on the first side of the multiple sides of the light-emitting component; the positive electrode is electrically connected to the negative electrode of the light-emitting component. The anode of the light-emitting component; the plurality of light-emitting chips include a first light-emitting chip and a second light-emitting chip, and the first light-emitting chip also includes a first connection electrode, which is arranged on the second side of the plurality of sides, and the The first side and the second side are different sides, the first connection electrode is insulated from the first light-emitting component of the first light-emitting chip, and the positive electrode of the first light-emitting chip extends to the first light-emitting the bottom surface of the chip;

Stacking the second light-emitting chip on the top surface of the first light-emitting chip, making the negative electrode of the first light-emitting chip abut against the negative electrode of the second light-emitting chip and electrically connecting to form a common electrode; and abutting and electrically connecting the positive electrode of the second light-emitting chip to the first connection electrode of the first light-emitting chip to form a second electrode.

In one embodiment of the present invention, the plurality of light-emitting chips further include a third light-emitting chip, the first light-emitting chip further includes a second connection electrode spaced apart from the first connection electrode, and the second connection electrode An electrode is insulated from the first light-emitting component of the first light-emitting chip and extends to the bottom surface of the first light-emitting chip, and the second light-emitting chip further includes a third connection aligned with the second connection electrode electrode, the third connection electrode is insulated from the second light-emitting component of the second light-emitting chip, and the preparation method of the laminated light-emitting unit further includes: stacking the third light-emitting chip on the second light-emitting unit On the side of the chip away from the first light-emitting chip, the second connection electrode, the third connection electrode and the positive electrode of the third light-emitting chip are sequentially stacked to form a third electrode, and the The negative electrode of the third light-emitting chip abuts and is electrically connected to the negative electrode of the second light-emitting chip.

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 laminated light-emitting unit includes: vapor-depositing the first Light-emitting chip: 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.

On the other hand, another embodiment of the present invention provides a display panel, comprising: an array substrate; the laminated light-emitting unit described in any one of the foregoing embodiments is disposed on the array substrate and electrically connected to the array substrate.

In an embodiment of the present invention, the display panel further includes a condensing lens, the condensing lens is arranged opposite to the array substrate, and the stacked light-emitting unit is located between the condensing lens and the array substrate. between them, corresponding to the condenser lens.

It can be seen from the above that the above-mentioned embodiments of the present invention can achieve one or more of the following beneficial effects: stacking multiple light-emitting components in sequence and forming a corresponding electrical connection relationship, so that multiple light-emitting components can emit light at the same position and can be independently controlled Light emitting, so the occupied area of the light emitting unit is reduced, high resolution display can be realized, and the effect of narrow light emission and low color shift can be realized.

Other aspects and features of the present invention will become apparent from the following detailed description with reference to the accompanying drawings. It should be understood, however, that the drawings are designed for the purpose of illustration only, and not as limiting the scope of the present invention. It should also be understood that, unless otherwise indicated, the drawings are not necessarily drawn to scale and are merely intended to conceptually illustrate the structures and processes described herein.

Description of drawings

The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

FIG. 1 is a schematic bottom view of a laminated light-emitting unit provided by an embodiment of the present invention.

Fig. 2 is 1-1 sectional view of Fig. 1;

Fig. 3 is the 2-2 sectional view of Fig. 1;

Fig. 4 is another embodiment of 1-1 sectional view of Fig. 1;

5 is a schematic top view of a second light-emitting chip in an embodiment of the present invention;

Fig. 6 is the 3-3 sectional view of Fig. 5;

Fig. 7 is a sectional view of 4-4 of Fig. 5;

Fig. 8 is a schematic bottom view of the first light-emitting chip in an embodiment of the present invention;

Fig. 9 is a sectional view of 5-5 of Fig. 8;

Fig. 10 is a schematic top view of a third light-emitting chip in an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a display panel provided by an embodiment of the present invention.

[Description of Reference Signs]

100: laminated light-emitting unit; 101: top surface; 102: bottom surface; 103: side surface; 1031: first side surface;

1032: second side; 1033: third side; 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 connection electrode; 250: second connection electrode; 260: third connection electrode; 201: first connection electrode 1 light emitting chip; 202: second light emitting chip; 203: third light emitting chip; 300: display panel; 301: array substrate; 302: condenser lens.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described implementation Examples are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

It should also be noted that the division of multiple embodiments in the present invention is only for the convenience of description, and should not constitute a special limitation, and features in various embodiments can be combined and referred to each other if there is no contradiction.

【The first embodiment】

As shown in FIG. 1 , it is a schematic bottom view of a stacked light-emitting unit 100 provided by an embodiment of the present invention. FIG. 2 is a sectional view of 1-1 in FIG. 1 , and FIG. 3 is a sectional view of 2-2 in FIG. 1 A laminated light-emitting unit 100 provided by an embodiment of the present invention includes 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 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, and the common electrode 40 is arranged on the first side 1031 of the plurality of sides 103, respectively connecting and conducting the first light-emitting group 10 and the second light-emitting component 20. negative electrode. The second electrode 60 is arranged on the second side 1032 of the plurality of sides 103. The first side 1031 and the second side 1032 are different sides. Insulated, the second electrode 60 extends to the bottom surface 102 of the first light emitting component 10 . The laminated light emitting unit 100 provided by this embodiment will be further described below with reference to FIG. 1 , FIG. 2 and FIG. 3 .

For example, referring to FIG. 1 , FIG. 2 and FIG. 3 , the first light-emitting group 10 is a hexahedral structure with four sides 103 . For example, referring to FIG. It is the left side 103 of the first light-emitting assembly 10, and 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 is the right side 103, and the second side 1032 is the front or rear side 103, This embodiment is not limiting.

The first light-emitting component 10 and the second light-emitting component 20, for example, are used to emit light of different colors, including a light-emitting functional layer and an insulating protective layer surrounding the light-emitting functional layer. For example, in FIGS. 2 and 3, the unfilled part of the first light-emitting component 10 is The light-emitting functional layer, the part filled with a single slash is an insulating protective layer, through which the second electrode 60 can be insulated from the first light-emitting component 10, and the first electrode 50 can be insulated from the second light-emitting component 20 (the first electrode 50 is located at side 103), openings are provided on the insulating protection layer respectively corresponding to the anode and cathode positions of the first light-emitting component 10 and the second light-emitting component 20, so that the common electrode 40 can communicate with the first light-emitting component 10 and the second light-emitting component 20 through the opening. The negative pole of the first electrode 50 is electrically connected to the positive pole of the first light-emitting component 10 and the second electrode 60 is connected to the positive pole of the second light-emitting component 20 . Wherein the first light emitting component 10 can be, for example, an inorganic light emitting structure or an organic light emitting structure, and the second light emitting component 20 is, for example, an inorganic light emitting structure. When the first light emitting component 10 or the second light emitting component 20 is, for example, an inorganic light emitting structure, its The functional layer includes an N-doped semiconductor layer, a quantum well layer and a P-doped semiconductor layer stacked in sequence, wherein the P-doped semiconductor layer is the anode of the first light-emitting component 10, and the N-doped semiconductor layer is the first light-emitting component. 10's negative pole. For example, an ITO film layer is further disposed on the P-doped semiconductor layer and the N-doped semiconductor layer 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 emission layer (EML), an electron transport layer (ETL) and Electron injection layer (EIL), wherein the hole injection layer is the positive pole of the first light emitting component 10, and the electron injection layer is the negative pole of the first light emitting component 10. Referring to FIG. 4, the first light emitting component 10 is an organic light emitting structure 1-1 sectional view, FIG. 2 is a 1-1 sectional schematic diagram of the first light-emitting component 10 having an inorganic light-emitting structure, and the first light-emitting component 10 is a flip-chip structure. Of course, here are some examples for the structure of the first light-emitting assembly 10 , and should not be regarded as a limiting condition for understanding this embodiment.

The common electrode 40, the first electrode 50 and the second electrode 60, for example, can be common metal electrode materials such as Ni (nickel), Pt (platinum), Au (gold), and can be a single layer or a multilayer. not limited. For example, the first electrode 50 may be located on the bottom surface 102 of the first light emitting component 10 as shown in FIG. 2 and FIG. 3 , or may be located on the side surface 103 (not shown), which is not limited in this embodiment. For example, the structure shown in Fig. 2 and Fig. 3 is a three-layer stacked structure, and the first light-emitting component 10 and the second light-emitting component 20 of this embodiment are respectively the first layer and the second layer of the three-layer stacked structure from bottom to top. Of course, in other embodiments of the present invention, the first light-emitting component 10 and the second light-emitting component 20 can refer to the second layer and the third layer of the three-layer stacked structure shown in FIG. 3 from bottom to top, and this embodiment does not not limited. Of course, this embodiment does not limit the number of laminated layers of the laminated light emitting unit 100 , which may also include three laminated layers as shown in FIG. 2 and FIG. 3 , or even more laminated layers such as four layers. 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 welding of the laminated light-emitting unit 100 .

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 glows green. When the laminated light-emitting unit 100 of this embodiment is working, the common electrode 40 and the first electrode 50 can be energized, and the second electrode 60 is not energized, then the first light-emitting component 10 is energized to emit red light, and the second light-emitting component 20 does not emit light. The laminated light emitting unit 100 can emit red light. Alternatively, if the common electrode 40 and the second electrode 60 are energized and the first electrode 50 is not energized, then the first light-emitting component 10 does not emit light, the second light-emitting component 20 emits green light, and the laminated light-emitting unit 100 emits green light. Alternatively, if both the first electrode 50 and the second electrode 60 are energized with the common electrode 40, then the red light emitted by the first light-emitting component 10 and the green light emitted by the second light-emitting component 20 are mixed so that the laminated light-emitting unit 100 emits a mixture of red and green. Light. Of course, the above is just an example, and this embodiment does not limit the specific light-emitting colors of the first light-emitting component 10 and the second light-emitting component 20 . In this embodiment, the first light-emitting component 10 and the second light-emitting component 20 are laminated, and the first light-emitting component 10 and the second light-emitting component 20 can be energized and emit light independently, so that each laminated light-emitting unit 100 can realize multiple This light-emitting method can reduce the area occupied by each chip on the display panel compared with the traditional light-emitting structure, which is conducive to the realization of high-resolution display.

Further, in one embodiment, the stacked light emitting unit 100 further includes, for example, a third light emitting component 30 and a third electrode 70 , and the third light emitting component 30 is stacked on a side of the second light emitting component 20 away from the first light emitting component 10 . The third electrode 70 is arranged at intervals from the first electrode 50 , the second electrode 60 and the common electrode 40 , and is arranged on the third side 1033 among the 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 pole of the third light emitting component 30 , and the common electrode 40 is connected to the negative pole 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, as shown in FIG. 2 and FIG. On the side, referring to the orientation of FIG. 1 , the second electrode 60 is located in the lower left corner of FIG. 1 , for example, and the third electrode 70 is located in the upper left corner of FIG. 1 . In some other embodiments of the present invention, for example, the first side 1031 is the right side of the first light-emitting assembly 10, the second side 1032 is the front side of the first light-emitting assembly 10, and the third side 1033 is the first light-emitting The side of the rear side of the component 10 is not limited by this embodiment. The first electrode 50 is, for example, disposed on the bottom surface 102 of the first light-emitting component 10 , of course, it can also 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 . Wherein the third light-emitting component 70 is, for example, an inorganic light-emitting structure, reference may be made to the above-mentioned description that the first light-emitting component 10 and the second light-emitting component 20 are inorganic light-emitting structures. The two light-emitting components 20 emit light of different colors. 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 respectively emit one of red light, blue light and green light, Of course other color combinations are also possible. Since the red inorganic light-emitting structure generally adopts gallium arsenide semiconductor, the light transmittance is poor, so in the RGB combination, it is preferable that 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 70 is a blue light-emitting component. color light-emitting components to ensure the light emission effect of the laminated light-emitting unit 100. Applying the stacked light-emitting unit 100 of this embodiment to a display panel with RGB three-color display, only one stacked light-emitting unit 100 needs to be installed corresponding to the original three RGB sub-pixel lamp positions, which is equivalent to reducing the area occupied by each pixel position to About one-third of the original, the resolution is increased accordingly, which is conducive to the realization of high-resolution display. In addition, the RGB three-color light in each pixel is emitted from the same light point position, which is beneficial to improve the color shift phenomenon caused by the RGB three-color light emitting from different positions in the existing display. This embodiment can also be referred to when the laminated light emitting unit 100 provided by the present invention has a laminated structure of four or more layers.

Further, in one embodiment, referring to FIG. 1 , FIG. 2 and FIG. 3 , the second electrode 60 extends to the side 103 adjacent to the second side 1032 , and extends to the first light emitting component 10 and the second light emitting component 20 Between, and between the second light emitting component 20 and the third light emitting component 30 , it can also extend to a 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 . For example, the common electrode 40 also 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 second side 1032 is, for example, the side 103 on the left side of the first light-emitting component 10 (lower left in FIG. 1 ), and the second electrode 60 also extends to the side 103 adjacent to the left side (for example, the upper side in FIG. 1 , corresponding to FIG. 2 ). front), the third side 1033 is, for example, the side 103 on the left side of the first light-emitting component 10 (upper left in FIG. 1 ), and the third electrode 70 also extends to the side 103 adjacent to the left side (the lower side in FIG. later). In this embodiment, the areas of the common electrode 40 , the second electrode 60 and the third electrode 70 can be increased, and the conduction effect is better. It should be noted that, for example, when the first electrode 50 is also arranged on the side surface 103 , it can be extended in a manner similar to that of the second electrode 60 or the third electrode 70 , which will not be repeated in this embodiment.

【Second Embodiment】

The second embodiment of the present invention provides a method for preparing a laminated light-emitting unit, for example, including:

Step S1: Provide a plurality of light-emitting chips; for example, the light-emitting chips 200 shown in FIG. 5 or FIG. The light emitting component 210 has an opposite top surface 101 and a bottom surface 102 , 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 the first side 1031 of the plurality of sides 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 further includes a first connection electrode 240, and the first connection electrode 240 is arranged on the second side 1032 of the plurality of sides 103, The second side 1032 and the first side 1031 are different sides, the first connection electrode 240 is insulated from the first light-emitting component 10 of the first light-emitting chip 201, and the positive electrode 230 of the first light-emitting chip 201 extends to the bottom of the first light-emitting chip 201. the bottom surface 102 of the first light-emitting component 10;

Step S2: Stack the second light-emitting chip 202 on the top surface 101 of the first light-emitting chip 201, make 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 electrically connect to form a common electrode 40 , and making the positive electrode 230 of the second light emitting chip 202 abut and electrically connect with the first connection electrode 240 of the first light emitting chip 201 to form the second electrode 60 .

Please refer to FIG. 8, which is a schematic bottom view of the first light-emitting chip 201 provided by an embodiment of the present invention. FIG. 9 is a cross-sectional view of 5-5 (or a cross-sectional view of 6-6) in FIG. 6 is a sectional view of 3-3 in FIG. 5 , and FIG. 7 is a sectional view of 4-4 in FIG. 5 . It can be seen that the positive electrode 230 of the first light-emitting chip 201 is, for example, disposed 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, for example, disposed on the second side 1032. Of course, this embodiment does not As a limitation, in some embodiments, the positive electrode 230 of the first light-emitting chip 201 can also be disposed on the side surface 103 , for example. The preparation method of the laminated light-emitting unit provided in this embodiment can be used to prepare the laminated light-emitting unit 100 as described in the first embodiment. Regarding the first light-emitting component 10, the second light-emitting component 20, the common electrode 40, the second The description of the electrode 60 can refer to the description in the first embodiment, which will not be repeated here. In the preparation method of this embodiment, the positive electrode 230 of the first light-emitting chip 201 is, for example, set on the bottom surface 102 of the first light-emitting component 10, then the second The positive electrode 230 of a light emitting chip 201 is equivalent to the first electrode 50 in the laminated light emitting unit 100 . For example, when the positive electrode 230 of the first light-emitting chip 201 is disposed on the side surface 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 corresponding electrode material on the second light-emitting chip 202. Of course, The first electrode 50 is insulated from the second light emitting component 20 .

Further, in one embodiment, for example, the plurality of light emitting chips 200 further include a third light emitting chip 203, the first light emitting chip 201 further includes a second connection electrode 250 spaced apart from the first connection electrode 240, and the second connection electrode 250 Insulated from the first light-emitting component 10 of the first light-emitting chip 201, and extending to the bottom surface 102 of the first light-emitting chip 201, the second light-emitting chip 202, for example, further includes a third connection electrode 260 aligned with the second connection electrode 250, the third The connecting electrode 260 is insulated from the second light-emitting component 20 of the second light-emitting chip 202, and the method for preparing the laminated light-emitting unit further includes step S3: stacking the third light-emitting chip 203 on one side of the second light-emitting chip 202 away from the first light-emitting chip 201 On the side, the second connection electrode 250, the third connection electrode 260, and the positive electrode 230 of the third light-emitting chip 203 are sequentially laminated to form the third electrode 70, and the negative electrode 220 of the third light-emitting chip 203 is connected to the second light-emitting chip. The negative electrode 220 of 202 abuts and is electrically connected. For example, referring to FIG. 10 , which is a schematic top view of the third light-emitting chip 203 in an embodiment of the present invention, it can be seen that its positive electrode 230 is aligned with the third connection electrode 260 in the second light-emitting chip 202 .

Further, 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 are, for example, Inorganic light-emitting chip, the preparation method of the laminated light-emitting unit includes:

Step S11: evaporating the first light-emitting chip on the substrate;

Step S21: Transfer and connect 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.

For example, step S31 may also be included: transferring and connecting 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.

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 arranged. The hole injection layer (HIL), hole transport layer (HTL), light emitting layer (EML), electron transport layer (ETL) and electron injection layer (EIL) can be formed sequentially by evaporation process.

The second embodiment of the present invention can be used to prepare the laminated 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.

[Third embodiment]

Referring to FIG. 11 , the present invention provides a display panel 300, including an array substrate 301 and a laminated light-emitting unit 100. The laminated light-emitting unit 100 can be any one of the above-mentioned first embodiments, and is arranged on the array substrate 301 and electrically The array substrate 301 is connected. For example, a driving circuit layer for driving the laminated light-emitting unit 100 is provided on the array substrate 301. The driving circuit layer may include, for example, wiring (such as a data line, a scanning line), a TFT (Thin Film Transistor) thin film transistor, and capacitors, etc. element. Referring to FIG. 11 , it shows three stacked light emitting units 100 disposed on the base substrate 301 . Of course, this embodiment is only for illustration and does not limit the number of stacked light emitting units 100 . When the stacked light-emitting unit 100 is arranged on the array substrate 301, the installation direction is 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 part of the light emitting unit 100 extending to the bottom surface 102 of the first light emitting component 10 through the common electrode 40, the first electrode 50 and the second electrode 60 is respectively electrically connected to the driving circuit layer on the array substrate 301, such as the first electrode 50 and the second electrode 60 They are respectively electrically connected to different TFT thin film transistors, and the common electrode 40 is connected to the common electrode on the driving circuit layer, so as to control and drive the first light-emitting component 10 and the second light-emitting component 20 respectively. When the laminated light emitting unit 100 also has the third light emitting component 30 and the third electrode 70, the part of the third electrode 70 extending to the bottom surface 102 of the first light emitting component 10 is electrically connected to another different TFT on the driving circuit layer on the array substrate 301 The thin film transistors are used to control and drive the first light-emitting component 10 , the second light-emitting component 20 and the third light-emitting component 30 respectively. 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, so that the corresponding display The position of each laminated light-emitting unit 100 on the panel 300 can realize red light, green light, blue light, red-green mixed light, blue-green mixed light, red-blue mixed light, white light, etc. by independently controlling different light-emitting components to emit light. color effect. For each pixel position of the existing RGB display panel, three light points R, G, and B need to be set, but the display panel 300 provided in this embodiment only needs to set one laminated light-emitting unit 100 at each pixel position to realize full RGB lighting. Color effect, the area occupied by the light point at each pixel position is about one-third of the original area, which can achieve higher resolution display. In addition, the structure of each pixel position of the existing RGB display panel emits three colors of light from three positions, and the mixing effect of the three colors of light is different under different viewing angles (left, right, or centered), and the color shift is relatively large. . However, the display panel 300 provided by the embodiment of the present invention emits three colors of light from the same position, which can greatly reduce color shift. Certainly, the number of layers of the laminated light-emitting unit 100 is not limited in the embodiment of the present invention, and a larger number of layers can also achieve a smaller occupied area and higher resolution.

Furthermore, in another embodiment of the present invention, the display panel 300 further includes a condenser lens 302. As shown in FIG. It is disposed between the array substrate 301 and corresponding to the condenser lens 302 . For example, the positions of the three laminated light emitting units 100 shown in FIG. 11 correspond to a condenser lens 302 respectively, and the light emitting angle of the laminated light emitting unit 100 can be further limited by the condenser lens 302 to achieve a narrow light emitting effect.

The third embodiment of the present invention adopts the laminated light-emitting unit 100 provided by the first embodiment, which has at least the same beneficial effect as that of the first embodiment, which will not be repeated here.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the technical content disclosed above to make some changes or modify them into equivalent embodiments with equivalent changes, but as long as they do not depart from the technical solution of the present invention, the Technical Essence Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the present invention.

Claims (10)

1. A laminated light-emitting unit, characterized in that it comprises: a first light emitting assembly having opposite top and bottom surfaces, and a plurality of side surfaces between the top and bottom surfaces; a second light-emitting component stacked on the top surface of the first light-emitting component; A common electrode, disposed on the first side of the plurality of sides, electrically connected to the negative electrodes of the first light-emitting component and the second light-emitting component, respectively, and the common electrode extends to the bottom surface; The second electrode is arranged on the second side of the plurality of sides, the first side and the second side are respectively different sides, the second electrode is electrically connected to the anode of the second light-emitting component and Insulated from the first light-emitting component, the second electrode extends to the bottom surface; The first electrode is spaced apart from the common electrode and the second electrode, the first electrode is electrically connected to the anode of the first light emitting component and is insulated from the second light emitting component. 2. The laminated light-emitting unit according to claim 1, further comprising: a third light-emitting component, stacked on a side of the second light-emitting component away from the first light-emitting component; The third electrode is spaced apart from the first electrode, the second electrode, and the common electrode, and is arranged on a third side of the plurality of sides, and the third side is different from the first side. the side surface; the third electrode is electrically connected to the anode 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 arranged on the bottom surface. 3. The laminated light-emitting unit according to claim 1, wherein both the first light-emitting component and the second light-emitting component are inorganic light-emitting structures, the first electrode is arranged on the second side and extending to or disposed on said 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 laminated light-emitting unit according to claim 2, wherein the first light-emitting component, the second light-emitting component and the third light-emitting component are all inorganic light-emitting structures. 5. The laminated light-emitting unit according to claim 2, wherein 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. 6. The laminated light-emitting unit according to claim 2, wherein 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 components. 7. The laminated light-emitting unit according to claim 2, wherein the second electrode extends to the side adjacent to the second side and extends to the first light-emitting component and the second light-emitting component. Between components and between the second light emitting component and the third light emitting component; the third electrode extends to the side adjacent to the third side and extends to the first light emitting component and the first light emitting component Between two light emitting components and between the second light emitting component and the third light emitting component. 8. The laminated light-emitting unit according to claim 1, wherein the first electrode is electrically connected to the anode of the first light-emitting component through an ohmic contact material, and the second electrode is electrically connected to the anode of the first light-emitting component through an ohmic contact material. The positive electrode of the second light-emitting component is electrically connected, and the common electrode is electrically connected with the negative electrodes of the first light-emitting component and the second light-emitting component through an ohmic contact material. 9. A method for preparing a laminated light-emitting unit, comprising: A plurality of light-emitting chips are provided, each of the light-emitting chips respectively includes: a light-emitting component having opposite top surfaces and bottom surfaces, and a plurality of side surfaces located between the top surface and the bottom surface, and a negative electrode electrically connected to the The negative electrode of the light-emitting component is arranged on the first side of the multiple sides of the light-emitting component; the positive electrode is 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 includes a first connection electrode disposed on a second side of the plurality of sides, the first side and the second side are different sides, and the first connection electrode is connected to the second side. Insulate the first light-emitting component of the first light-emitting chip, and the positive electrode of the first light-emitting chip extends to the bottom surface of the first light-emitting chip; Stacking the second light-emitting chip on the top surface of the first light-emitting chip, making the negative electrode of the first light-emitting chip abut against the negative electrode of the second light-emitting chip and electrically connecting to form a common electrode; and abutting and electrically connecting the positive electrode of the second light-emitting chip to the first connection electrode of the first light-emitting chip to form a second electrode. 10. A display panel, characterized in that it comprises: Array substrate; The laminated light-emitting unit according to claims 1-8 is disposed on the array substrate and electrically connected to the array substrate.

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