Micro display unit and display device

Abstract

The embodiment of the utility model discloses a micro-display unit and a display device, the micro-display unit comprises at least two light-emitting units and an independent electrode, the at least two light-emitting units are vertically stacked, each independent electrode is electrically connected with one light-emitting unit, and the independent electrode is electrically connected with the other light-emitting unit along the horizontal direction. The independent electrodes extend out of the light-emitting units, so that the occupied area of the independent electrodes on the light-emitting units can be reduced, correspondingly, the area of the light-emitting units shielded by the independent electrodes is reduced, the light-emitting area of the light-emitting units is increased, and improvement of the display effect is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of displays, in particular to a micro-display unit and a display device. Background Art

[0002] Micro-LEDs have characteristics such as small size, high integration, and self-luminescence, and are widely used in display devices.

[0003] Existing micro-LEDs have the problems of a relatively small light-emitting area and poor display effects. Summary of the Utility Model

[0004] The utility model provides a micro-display unit and a display device to increase the light-emitting area of the light-emitting unit and improve the display effect.

[0005] According to one aspect of the utility model, a micro-display unit is provided, including: at least two stacked light-emitting units and at least one independent electrode;

[0006] Each independent electrode is electrically connected to one of the light-emitting units respectively, and in the horizontal direction, at least one independent electrode extends beyond each light-emitting unit, and the horizontal direction is perpendicular to the stacking direction of the light-emitting units.

[0007] Optionally, the independent electrode includes a first connection end and a second connection end. The first connection end is electrically connected to the corresponding light-emitting unit, and the second connection end is used to connect the driving circuit layer, and the driving circuit layer is used to provide an electrical signal to the second connection end; and in the horizontal direction, the second connection end is located outside each light-emitting unit.

[0008] Optionally, among at least two adjacent light-emitting units, the orthographic projection of the upper light-emitting unit on the lower light-emitting unit is within the lower light-emitting unit, and the bottom area of the upper light-emitting unit is smaller than the top area of the lower light-emitting unit. A mesa is formed at the edge position between the bottom surface of the upper light-emitting unit and the top surface of the lower light-emitting unit, and at least part of the independent electrode is located on the mesa.

[0009] Optionally, the independent electrode includes a first connection portion, a second connection portion, and a third connection portion. The first connection portion is electrically connected to the light-emitting unit, the second connection portion is used to electrically connect the driving circuit layer, and the third connection portion is electrically connected to the first connection portion and the second connection portion respectively;

[0010] At least part of the third connection portion is located on the side of at least one light-emitting unit;

[0011] The first connection portion is located on the mesa and / or part of the third connection portion is located on the mesa.

[0012] Optionally, the bottom area of the light-emitting unit is larger than the top area of the light-emitting unit, and the side surface of the light-emitting unit is an inclined surface.

[0013] Optionally, the microdisplay unit further includes a driving circuit layer located on one side of the light-emitting unit;

[0014] Among at least one independent electrode, the positive projection of the first connection portion and the third connection portion on the driving circuit layer extends along a first direction, and the positive projection of the second connection portion on the driving circuit layer extends along a second direction; or,

[0015] The positive projection of the second connection portion and the third connection portion on the driving circuit layer extends along the first direction, and the positive projection of the first connection portion on the driving circuit layer extends along the second direction; wherein, the first direction and the second direction intersect.

[0016] Optionally, the microdisplay unit includes a first independent electrode and a second independent electrode; the first independent electrode is electrically connected to the upper light-emitting unit in the adjacent light-emitting units, and a part of the first independent electrode is located on the side of the upper light-emitting unit away from the lower light-emitting unit; the second independent electrode is electrically connected to the lower light-emitting unit in the adjacent light-emitting units, and a part of the second independent electrode is located on the side of the lower light-emitting unit close to the upper light-emitting unit;

[0017] The positive projection area of the first independent electrode within the upper light-emitting unit is smaller than the positive projection area of the second independent electrode within the lower light-emitting unit.

[0018] Optionally, the positive projection of the light-emitting unit on the driving circuit layer is polygonal, and the positive projection of the independent electrode on the driving circuit layer covers one of the vertices of the polygon.

[0019] Optionally, the light-emitting unit includes a first semiconductor layer, a light-emitting layer, and a second semiconductor layer arranged in a stacked manner, and the independent electrode is electrically connected to the first semiconductor layer;

[0020] The microdisplay unit further includes a common electrode, and the common electrode is electrically connected to the second semiconductor layer of each light-emitting unit.

[0021] According to another aspect of the present invention, there is provided a display device including the microdisplay unit of any embodiment of the present invention, and the independent electrode is partially located in the gap between the light-emitting units of adjacent microdisplay units.

[0022] The microdisplay unit and the display device according to the embodiments of the present invention include at least two light-emitting units and one independent electrode. The at least two light-emitting units are vertically stacked, and each independent electrode is electrically connected to one of the light-emitting units respectively. And in the horizontal direction, the independent electrode extends beyond each light-emitting unit, so that the occupied area of the independent electrode on the light-emitting unit can be reduced. Correspondingly, the area of the light-emitting unit blocked by the independent electrode is reduced, so that the light-emitting area of the light-emitting unit is increased, which is beneficial to improving the display effect.

[0023] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present utility model, nor is it used to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 is a top view of a microdisplay unit provided by an embodiment of the present utility model;

[0026] Figure 2 is a cross-sectional view of a microdisplay unit provided by an embodiment of the present utility model;

[0027] Figure 3 is a cross-sectional view of another microdisplay unit provided by an embodiment of the present utility model;

[0028] Figure 4 is a schematic structural diagram of a display device provided by an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to enable those skilled in the art to better understand the solution of the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0031] The utility model provides a micro display unit. Figure 1 is a top view of a micro display unit provided by an embodiment of the utility model, Figure 2 is a cross-sectional view of a micro display unit provided by an embodiment of the utility model, Figure 3 is a cross-sectional view of another micro display unit provided by an embodiment of the utility model, wherein: Figure 2 Can correspond Figure 1 Cut along AA' to get: Figure 3 Can correspond Figure 1 Obtained by cutting along BB'. Figures 1 - 3 The micro display unit includes: at least two stacked light-emitting units 110 and at least one independent electrode 50; each independent electrode 50 is electrically connected to one of the light-emitting units 110, and along the horizontal direction x, at least one independent electrode 50 extends outside each light-emitting unit 110, and the horizontal direction x is perpendicular to the stacking direction of the light-emitting units 110 (referred to as the stacking direction y).

[0032] Specifically, at least two light-emitting units 110 of the micro-display unit are vertically stacked in space, so that the plane area occupied by the micro-display unit can be smaller, and when the micro-display unit is applied to a display device, the resolution of the display device can be improved. Exemplarily, the light-emitting unit 110 can be bonded through a bonding layer, and the material of the bonding layer can be a conductive material, such as a transparent metal oxide or a metal; or a non-conductive material, such as an adhesive material with adhesion.

[0033] In some optional embodiments of the present invention, the micro display unit includes two light emitting units 110, for example, the micro display unit includes a red light emitting unit and a green light emitting unit, and the red light emitting unit and the green light emitting unit are stacked. In another optional embodiment of the present invention, the micro display unit includes at least three light emitting units 110, and at least three light emitting units 110 are stacked vertically. Figures 1 - 3As shown, exemplarily, the microdisplay unit includes a first light-emitting unit 111, a second light-emitting unit 112, and a third light-emitting unit 113 that are stacked in sequence from bottom to top. The colors of the first light-emitting unit 111, the second light-emitting unit 112, and the third light-emitting unit 113 are all different. Exemplarily, the light-emitting colors of the first light-emitting unit 111, the third light-emitting unit 113, and the third light-emitting unit 113 are red, green, and blue, respectively. Among them, in the microdisplay unit, different light-emitting units 110 can emit light independently. When the light-emitting units 110 of one light-emitting color in the microdisplay unit emit light independently, the microdisplay unit can achieve monochromatic display; when the light-emitting units 110 of at least two light-emitting colors in the microdisplay unit emit light simultaneously, the microdisplay unit can achieve full-color display. Optionally, the light-emitting unit 110 is light-transmissive, so that the light emitted by the lower light-emitting unit 110 can still be displayed through the upper light-emitting unit 110.

[0034] The microdisplay unit may further include at least one independent electrode 50, and each independent electrode 50 is electrically connected to one of the light-emitting units 110. The light-emitting unit 110 may include a first semiconductor layer 21, a light-emitting layer 22, and a second semiconductor layer 23 that are stacked. Among them, the first semiconductor layer 21 is an N-type semiconductor layer, and the second semiconductor layer 23 is a P-type semiconductor layer; or the first semiconductor layer 21 is a P-type semiconductor layer, and the second semiconductor layer 23 is an N-type semiconductor layer. The N-type semiconductor layer may include n-GaN, and the P-type semiconductor layer may include p-GaN. The light-emitting layer 22 may be a quantum well layer, optionally a multiple quantum well layer, such as a multiple quantum well layer of InGaN / GaN. Among them, in the light-emitting unit 110, the first semiconductor layer 21, the light-emitting layer 22, and the second semiconductor layer 23 may be stacked from bottom to top, or the first semiconductor layer 21, the light-emitting layer 22, and the second semiconductor layer 23 may be stacked from top to bottom. Optionally, the independent electrode 50 is electrically connected to the first semiconductor layer 21 of the light-emitting unit 110. Optionally, the microdisplay unit further includes a common electrode 54, and the common electrode 54 is electrically connected to the second semiconductor layer 23 of each light-emitting unit 110. Taking Figures 1 - 3 the structure shown as an example, the microdisplay unit includes two independent electrodes 50, namely a first independent electrode 52 and a second independent electrode 56. The first independent electrode 52 is electrically connected to the first semiconductor layer 21 of the third light-emitting unit 113, and the second independent electrode 56 is electrically connected to the first semiconductor layer 21 of the second light-emitting unit 112. The first light-emitting unit 111 can be directly bonded to the driving circuit layer 1, thereby realizing the electrical connection between the first semiconductor layer 21 in the first light-emitting unit 111 and the driving circuit layer 1.

[0035] Among them, the material of the independent electrode 50 can be a metal material or a metal oxide. In some embodiments, the independent electrode 50 is electrically connected to the light-emitting unit 110 above the light-emitting unit 110. By arranging at least one independent electrode 50 to extend beyond each light-emitting unit 110 in the horizontal direction x perpendicular to the vertical stacking direction of the light-emitting unit 110, the part of the independent electrode 50 extending beyond the light-emitting unit 110 does not block the light output of the light-emitting unit 110. Therefore, by arranging the independent electrode 50 to extend beyond each light-emitting unit 110 in the horizontal direction x, the occupied area of the independent electrode 50 on the light-emitting unit 110 can be reduced. Correspondingly, the area of the light-emitting unit 110 blocked by the independent electrode 50 is reduced, so that the light-emitting area of the light-emitting unit 110 can be increased, which is beneficial to improving the display effect.

[0036] The microdisplay unit of this embodiment includes at least two light-emitting units and at least one independent electrode. The at least two light-emitting units are vertically stacked. Each independent electrode is electrically connected to one of the light-emitting units respectively. And in the horizontal direction, the independent electrode extends beyond each light-emitting unit, so that the occupied area of the independent electrode on the light-emitting unit can be reduced. Correspondingly, the area of the light-emitting unit blocked by the independent electrode is reduced, so that the light-emitting area of the light-emitting unit is increased, which is beneficial to improving the display effect.

[0037] Continue to refer to Figures 1 - 3 , optionally, the independent electrode 50 includes a first connection end M1 and a second connection end M2. The first connection end M1 is electrically connected to the corresponding light-emitting unit 110, and the second connection end M2 is used to connect to the driving circuit layer 1. The driving circuit layer 1 is used to provide an electrical signal to the second connection end M2; and in the horizontal direction x, the second connection end M2 is located outside each light-emitting unit 110.

[0038] In some alternative embodiments of the present invention, the first connection end M1 is directly electrically connected to the corresponding light-emitting unit 110; in other alternative embodiments of the present invention, the first connection end M1 is electrically connected to the corresponding light-emitting unit 110 through other conductive structure layers. As Figures 1 - 3 shown, adjacent light-emitting units 110 are bonded and connected through a bonding layer 120. Exemplarily, the first light-emitting unit 111 and the second light-emitting unit 112 are bonded and connected through a first bonding layer 121, the second light-emitting unit 112 and the third light-emitting unit 113 are bonded and connected through a second bonding layer 122, and the first light-emitting unit 111 is bonded to the driving circuit layer 1 through a third bonding layer 123. Therefore, the third light-emitting unit 113 may not be provided with an independent electrode 50. Figures 1 - 3In the structure shown, the second semiconductor layer 23 of the first light-emitting unit 111 and the second semiconductor layer 23 of the second light-emitting unit 112 are bonded by the first bonding layer 121. Since the second semiconductor layer 23 is connected to the common electrode 54, an insulating dielectric layer may not be provided between the second semiconductor layer 23 of the first light-emitting unit 111 and the second semiconductor layer 23 of the second light-emitting unit 112. Of course, in some alternative embodiments, an insulating dielectric layer may be provided between each light-emitting unit 110. The first semiconductor layer 21 of the second light-emitting unit 112 and the first semiconductor layer 21 of the third light-emitting unit 113 are bonded and connected by the second bonding layer 122. The first semiconductor layer 21 is used to connect to the independent electrode 50 to achieve independent control of different light-emitting units 110. Therefore, in order to achieve independent light emission of different light-emitting units 110 in the microdisplay unit, an insulating dielectric layer 80 may be provided between the second light-emitting unit 112 and the third light-emitting unit 113. An ohmic contact layer 24 may be provided on the side of the first semiconductor layer 21 of the light-emitting unit 110 away from the second semiconductor layer 23, and / or on the side of the second semiconductor layer 23 of the light-emitting unit 110 away from the first semiconductor layer 21. The above-mentioned other conductive structure layers may include a bonding layer and / or an ohmic contact layer 24. The second connection end M2 is electrically connected to the driving circuit layer 1, and thus receives an electrical signal from the driving circuit layer 1. In this embodiment, the different independent electrodes 50 are insulated from each other, and can provide independent electrical signals for different light-emitting units 110, so that different light-emitting units 110 can emit light independently. And along the horizontal direction x, the second connection end M2 is located outside each light-emitting unit 110, and it can be ensured that at least part of the independent electrode 50 is located outside the light-emitting unit 110 along the horizontal direction x, thereby increasing the light-emitting area of the light-emitting unit 110.

[0039] Continuing to refer to Figures 1 - 3 , optionally, in at least two adjacent light-emitting units 110, the orthographic projection of the upper light-emitting unit 110 on the lower light-emitting unit 110 is within the lower light-emitting unit 110, and the bottom area of the upper light-emitting unit 110 is smaller than the top area of the lower light-emitting unit 110. A mesa 200 is formed at the edge position between the bottom surface of the upper light-emitting unit 110 and the top surface of the lower light-emitting unit 110, and the independent electrode 50 is at least partially located on the mesa 200.

[0040] Among them, in this embodiment, the upper light-emitting unit 110 and the lower light-emitting unit 110 both refer to two adjacent light-emitting units 110. Among two adjacent light-emitting units 110, the light-emitting unit 110 with a relatively higher position is the upper light-emitting unit 110, and the light-emitting unit 110 with a relatively lower position is the lower light-emitting unit 110. Among two adjacent light-emitting units 110, the upper light-emitting unit 110 is closer to the light-emitting surface of the microdisplay unit than the lower light-emitting unit 110, and the lower light-emitting unit 110 is closer to the driving circuit layer 1 than the upper light-emitting unit 110. The driving circuit layer 1 is used to provide electrical signals to the light-emitting unit 110.

[0041] Specifically, in the microdisplay unit, there are at least two adjacent light-emitting units 110 that satisfy the following conditions: along the vertical stacking direction y of the light-emitting units 110, the top surface area of the lower light-emitting unit 110 is larger than the bottom surface area of the upper light-emitting unit 110, and the vertical projection of the upper light-emitting unit 110 on the top surface of the lower light-emitting unit 110 is located within the top surface of the lower light-emitting unit 110, so that a mesa 200 is formed at the edge position between the top surface of the lower light-emitting unit 110 and the bottom surface of the upper light-emitting unit 110. Taking Figures 1 - 3 the shown structure as an example, a first mesa 201 is formed at the edge position between the top surface of the first light-emitting unit 111 and the bottom surface of the second light-emitting unit 112; a second mesa 202 is formed at the edge position between the top surface of the second light-emitting unit 112 and the bottom surface of the third light-emitting unit 113. At least a part of the first independent electrode 52 is located on the second mesa 202, and at least a part of the second independent electrode 56 is located on the first mesa 201.

[0042] In some optional embodiments of the present invention, among two adjacent light-emitting units 110, only a bonding layer is included between the bottom surface of the upper light-emitting unit 110 and the top surface of the lower light-emitting unit 110, and no other structural layers are included. In this case, the part of the lower light-emitting unit 110 not covered by the upper light-emitting unit 110 is the mesa 200. In other optional embodiments of the present invention, among two adjacent light-emitting units 110, other structural layers besides the bonding layer are further included between the bottom surface of the upper light-emitting unit 110 and the top surface of the lower light-emitting unit 110, such as an insulating dielectric layer and / or an ohmic contact layer 24, etc. In this case, not only the part of the lower light-emitting unit 110 not covered by the upper light-emitting unit 110 forms the mesa 200, but also the part of the insulating dielectric layer not covered by the upper light-emitting unit 110 and / or the part of the ohmic contact layer 24 not covered by the upper light-emitting unit 110 can form the mesa 200. For example Figures 1 - 3As shown, a first mesa 201 can be formed on parts of the top surface (second semiconductor layer 23) of the first light-emitting unit 111 that are not covered by the bottom surface of the second light-emitting unit 112, parts of the ohmic contact layer 24 in contact with the second semiconductor layer 23 of the first light-emitting unit 111 that are not covered by the bottom surface of the second light-emitting unit 112, and parts of the ohmic contact layer 24 in contact with the second semiconductor layer 23 of the second light-emitting unit 112 that are not covered by the second light-emitting unit 112. Among them, a second mesa 202 can be formed on parts of the top surface (first semiconductor layer 21) of the second light-emitting unit 112 that are not covered by the bottom surface of the third light-emitting unit 113, parts of the ohmic contact layer 24 in contact with the first semiconductor layer 21 of the second light-emitting unit 112 that are not covered by the bottom surface of the third light-emitting unit 113, parts of the insulating dielectric layer that are not covered by the bottom surface of the third light-emitting unit 113, and parts of the ohmic contact layer 24 in contact with the first semiconductor layer 21 of the third light-emitting unit 113 that are not covered by the third light-emitting unit 113.

[0043] Optionally, the top surface of the light-emitting unit 110 is a horizontal plane. Correspondingly, the mesa 200 is also a horizontal plane. In this embodiment, the independent electrode 50 is at least partially located on the mesa 200, making the structure of the independent electrode 50 stable and reliable, and avoiding loosening, slipping, or poor contact of the independent electrode 50.

[0044] Continue to refer to Figures 1 - 3 , optionally, the independent electrode 50 includes a first connection portion 50a, a second connection portion 50b, and a third connection portion 50c. The first connection portion 50a is electrically connected to the light-emitting unit 110. The second connection portion 50b is used to electrically connect to the driving circuit layer 1. The third connection portion 50c is electrically connected to the first connection portion 50a and the second connection portion 50b respectively; at least part of the third connection portion 50c is located on the side surface of at least one light-emitting unit 110; the first connection portion 50a is located on the mesa 200 and / or part of the third connection portion 50c is located on the mesa 200.

[0045] Among them, the structure of the independent electrode 50 can be integrally formed, that is, the first connection portion 50a, the second connection portion 50b, and the third connection portion 50c are an integral structure. The first connection portion 50a is electrically connected to the light-emitting unit 110. The first connection portion 50a is located on the mesa 200, and at least part of the orthographic projection of the first connection portion 50a on at least one light-emitting unit 110 falls within the light-emitting unit 110. In this way, the first connection portion 50a can be supported by the mesa 200, making the structure of the independent electrode 50 more stable. The second connection portion 50b can be located on the surface of the driving circuit layer 1 to achieve electrical connection with the driving circuit layer 1. One end of the third connection portion 50c is connected to the first connection portion 50a, and the other end of the third connection portion 50c is connected to the second connection portion 50b. Correspondingly, at least part of the third connection portion 50c is located on the side surface of at least one light-emitting unit 110.

[0046] Optionally, when other mesa 200 is included between the first connection portion 50a and the second connection portion 50b along the direction of vertical stacking of the light-emitting units 110, the third connection portion 50c may be partially located on the mesa 200. In this way, the structure of the independent electrode 50 can be made more stable, further avoiding loosening, slipping or poor contact of the independent electrode 50.

[0047] Based on the above technical solution, optionally, the bottom surface area of the light-emitting unit 110 is larger than the top surface area of the light-emitting unit 110, and the side surface of the light-emitting unit 110 is an inclined surface.

[0048] Among them, for one light-emitting unit 110, the top surface of the light-emitting unit 110 is closer to the light-emitting surface of the microdisplay unit than the bottom surface, and the bottom surface of the light-emitting unit 110 is closer to the driving circuit layer 1 than the top surface. By setting the side surface of the light-emitting unit 110 as an inclined surface, the structure of the third connection portion 50c can be made more stable, and then the structure of the entire independent electrode 50 can be made more stable and not easily fall off.

[0049] Continue to refer to Figures 1 - 3 , optionally, the microdisplay unit further includes a driving circuit layer 1, and the driving circuit layer 1 is located on one side of the light-emitting unit 110; among at least one independent electrode 50, the positive projections of the first connection portion 50a and the third connection portion 50c on the driving circuit layer 1 extend along the first direction x1, and the positive projection of the second connection portion 50b on the driving circuit layer 1 extends along the second direction x2; or, the positive projections of the second connection portion 50b and the third connection portion 50c on the driving circuit layer 1 extend along the first direction x1, and the positive projection of the first connection portion 50a on the driving circuit layer 1 extends along the second direction x2; where the first direction x1 and the second direction x2 intersect. The first direction x1 and the second direction x2 may respectively be one direction in the horizontal direction.

[0050] Such as Figure 1As shown, optionally, the orthographic projection of the independent electrode 50 on the driving circuit layer 1 is in an "L" shape. The independent electrode 50 may include a horizontal portion and a vertical portion, and the extending directions of the horizontal portion and the vertical portion are perpendicular, that is, in this case, the first direction x1 and the second direction x2 are perpendicular. In some optional embodiments of the present invention (such as the structure of the first independent electrode 52), the horizontal portion includes a first connecting portion 50a and a third connecting portion 50c, and the vertical portion includes a second connecting portion 50b; in other optional embodiments of the present invention (such as the structure of the second independent electrode 56), the horizontal portion includes a second connecting portion 50b and a first connecting portion 50a, and the vertical portion includes a second connecting portion 50b. By providing the "L"-shaped structure of the independent electrode 50, the shape of the independent electrode 50 can be more flexible, which is beneficial to reducing the occupied area of the independent electrode 50 on the driving circuit layer 1, and thus beneficial to improving the resolution of the display device.

[0051] Continuing to refer to Figures 1 - 3 , optionally, the microdisplay unit includes a first independent electrode 52 and a second independent electrode 56; the first independent electrode 52 is electrically connected to the upper light-emitting unit 110 in the adjacent light-emitting unit 110, and a part of the first independent electrode 52 is located on the side of the upper light-emitting unit 110 away from the lower light-emitting unit 110; the second independent electrode 56 is electrically connected to the lower light-emitting unit 110 in the adjacent light-emitting unit 110, and a part of the second independent electrode 56 is located on the side of the lower light-emitting unit 110 close to the upper light-emitting unit 110. Taking Figures 1 - 3 the structure shown as an example, for the adjacent second light-emitting unit 112 and third light-emitting unit 113, the third light-emitting unit 113 is the upper light-emitting unit 110, and the second light-emitting unit 112 is the lower light-emitting unit 110.

[0052] Specifically, among two adjacent light-emitting units 110, the area of the upper light-emitting unit 110 is smaller than that of the lower light-emitting unit 110, which may affect the display uniformity of the light-emitting units 110 located on different layers in the microdisplay unit. In this embodiment, by setting the orthographic projection area of the first independent electrode 52 electrically connected to the upper light-emitting unit 110 within the upper light-emitting unit 110 to be smaller than the orthographic projection area of the second independent electrode 56 electrically connected to the lower light-emitting unit 110 within the lower light-emitting unit 110, the area of the upper light-emitting unit 110 covered by the first independent electrode 52 is smaller than the area of the lower light-emitting unit 110 covered by the second independent electrode 56, thereby reducing the difference in the light-emitting areas of the upper light-emitting unit 110 and the lower light-emitting unit 110, which is beneficial to improving the display uniformity.

[0053] Continuing to refer to Figures 1 - 3 , optionally, the orthographic projection of the light-emitting unit 110 on the driving circuit layer 1 is in a polygon shape, and the orthographic projection of the independent electrode 50 on the driving circuit layer 1 covers one of the vertices of the polygon.

[0054] Among them, the orthographic projection of the light-emitting unit 110 on the driving circuit layer 1 can be triangular, quadrilateral, pentagonal or polygonal. In some alternative embodiments of the present invention, the orthographic projection of the light-emitting unit 110 on the driving circuit layer 1 is a rounded polygon. The orthographic projection of the independent electrode 50 on the driving circuit layer 1 covers one vertex of the polygon, that is, the independent electrode 50 straddles the adjacent sides of the polygon, so that the part of the light-emitting unit 110 covered by the independent electrode 50 is located at the corner position of the light-emitting unit 110. Furthermore, the setting of the independent electrode 50 has a relatively small influence on the light-emitting effect of the light-emitting unit 110, ensuring a good display effect.

[0055] Continuing to refer to Figures 1 - 3 , the driving circuit layer 1 includes at least two connection contacts 10. The first semiconductor layer 21 of the first light-emitting unit 111 is electrically connected to the first connection contact 11 through the third bonding layer 123. The first semiconductor layer 21 of the second light-emitting unit 112 is electrically connected to the second connection contact 12 through the second independent electrode 56. The first semiconductor layer 21 of the third light-emitting unit 113 is electrically connected to the third connection contact 13 through the first independent electrode 52.

[0056] Optionally, the microdisplay unit further includes a metal mesh 55. The metal mesh 55 is located on the side of the common electrode 54 away from the driving circuit layer 1. The metal mesh 55 is electrically connected to the common electrode 54 and is disposed around the light-emitting unit 110.

[0057] The microdisplay unit further includes a first insulating layer 51 and a second insulating layer 54. The first insulating layer 51 is used for passivating the side surface of the light-emitting unit 110. The independent electrode 50 is located between the first insulating layer 51 and the second insulating layer 53. The second insulating layer 53 can be used to insulate the independent electrode 50 and the common electrode 54 to prevent the short circuit between the independent electrode 50 and the common electrode 54 from affecting the display of the microdisplay unit.

[0058] The present invention also provides a display device. Figure 4 It is a schematic structural diagram of a display device provided by an embodiment of the present invention. Referring to Figure 4 , the display device includes a plurality of microdisplay units according to any of the above embodiments of the present invention. The independent electrode 50 is partially located in the gap between the light-emitting units of adjacent microdisplay units, so that the occupied area of the independent electrode 50 on the light-emitting unit can be reduced, and the light-emitting area of the light-emitting unit can be increased.

[0059] It should be understood that the various forms of processes shown above can be used, with steps reordered, added or deleted. For example, the steps described in the present utility model can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solution of the present utility model can be achieved, and no limitation is imposed herein.

[0060] The above specific embodiments do not constitute a limitation on the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A micro display unit, characterized in that: include: At least two stacked light-emitting units and at least one independent electrode; Each of the independent electrodes is electrically connected to one of the light-emitting units, and in the horizontal direction, at least one of the independent electrodes extends outside each of the light-emitting units, and the horizontal direction is perpendicular to the direction in which the light-emitting units are stacked; the independent electrode includes a first connection end and a second connection end, the first connection end is electrically connected to the corresponding light-emitting unit, and the second connection end is used to connect to a driving circuit layer, and the driving circuit layer is used to provide an electrical signal to the second connection end; and in the horizontal direction, the second connection end is located outside each of the light-emitting units.

2. The micro display unit according to claim 1, characterized in that: In at least two adjacent light-emitting units, the orthographic projection of the upper light-emitting unit on the lower light-emitting unit is within the lower light-emitting unit, and the bottom surface area of ​​the upper light-emitting unit is smaller than the top surface area of ​​the lower light-emitting unit, and a table is formed at the edge position of the bottom surface of the upper light-emitting unit and the top surface of the lower light-emitting unit, and the independent electrode is at least partially located on the table.

3. The micro display unit according to claim 2, characterized in that: The independent electrode comprises a first connection portion, a second connection portion and a third connection portion, wherein the first connection portion is electrically connected to the light emitting unit, the second connection portion is used to electrically connect to the driving circuit layer, and the third connection portion is electrically connected to the first connection portion and the second connection portion respectively; At least a portion of the third connecting portion is located on a side surface of at least one of the light emitting units; The first connection portion is located on the table top and / or a portion of the third connection portion is located on the table top.

4. The micro display unit according to claim 3, characterized in that: The bottom surface area of ​​the light emitting unit is larger than the top surface area of ​​the light emitting unit, and the side surface of the light emitting unit is an inclined surface.

5. The micro display unit according to claim 3, characterized in that: Also included is the driving circuit layer, which is located on one side of the light-emitting unit; In at least one of the independent electrodes, the orthographic projections of the first connection portion and the third connection portion on the driving circuit layer extend along a first direction, and the orthographic projection of the second connection portion on the driving circuit layer extends along a second direction; or, The orthographic projections of the second connection portion and the third connection portion on the driving circuit layer extend along a first direction, and the orthographic projection of the first connection portion on the driving circuit layer extends along a second direction; wherein the first direction and the second direction intersect.

6. The micro display unit according to claim 2, characterized in that: The invention comprises a first independent electrode and a second independent electrode; the first independent electrode is electrically connected to the upper light-emitting unit among the adjacent light-emitting units, and the first independent electrode portion is located on a side of the upper light-emitting unit away from the lower light-emitting unit; the second independent electrode is electrically connected to the lower light-emitting unit among the adjacent light-emitting units, and the second independent electrode portion is located on a side of the lower light-emitting unit close to the upper light-emitting unit; The orthographic projection area of ​​the first independent electrode in the upper light-emitting unit is smaller than the orthographic projection area of ​​the second independent electrode in the lower light-emitting unit.

7. The micro display unit according to claim 1, characterized in that: The orthographic projection of the light emitting unit on the driving circuit layer is a polygon, and the orthographic projection of the independent electrode on the driving circuit layer covers one of the vertices of the polygon.

8. The micro display unit according to claim 1, characterized in that: The light-emitting unit comprises a first semiconductor layer, a light-emitting layer, and a second semiconductor layer which are stacked, and the independent electrode is electrically connected to the first semiconductor layer; The micro display unit further includes a common electrode, and the common electrode is electrically connected to the second semiconductor layer of each of the light emitting units.

9. A display device, characterized in that: The invention comprises a plurality of micro display units according to any one of claims 1 to 8, wherein the independent electrode portion is located in a gap between the light emitting units of adjacent micro display units.

Images