Micro LED display panel

Abstract

To provide a multicolor micro LED display panel that reduces optical crosstalk between micro LEDs.SOLUTION: A micro LED display panel includes a micro LED array 600 including a plurality of micro LEDs 200 and a plurality of electrical connection structures 231 arranged around and electrically connected to the micro LEDs. A plurality of light propagation channels 371, 372 are formed between adjacent micro LEDs. Each of the light propagation channels includes at least one of a plurality of gaps 270 defined between adjacent electrical connection structures. In a top view of the micro LED array, the light propagation channels are bent.SELECTED DRAWING: Figure 6A

Description

Technical Field

[0001] Cross - reference to Related Applications This application is a continuation of International Patent Application No. PCT / CN2024 / 072987, filed on January 18, 2024, the entire content of which is incorporated herein by reference.

[0002] The present disclosure generally relates to micro - LED display technology, and more particularly to micro - LED display panels.

Background Art

[0003] Inorganic micro - pixel light - emitting diodes, also called micro - light - emitting diodes, micro - LEDs, or μ - LEDs, are becoming more important because they are used in various applications including self - emissive micro - displays, visible - light communication, and optogenetics. Micro - LEDs have better strain relaxation, improved light extraction efficiency, and uniform current spreading, resulting in higher output performance than conventional LEDs. Compared with conventional LEDs, micro - LEDs also exhibit several advantages such as improved thermal effects, faster response speeds, larger operating temperature ranges, higher resolutions, wider color gamuts, higher contrasts, lower power consumption, and operability at higher current densities.

[0004] Multi - color micro - LED display panels conventionally include a micro - LED array composed of a plurality of multi - color micro - LEDs, conventionally called multi - color pixels. It is advantageous to increase the density of micro - LEDs in a multi - color micro - LED display, which requires reducing the size and space between micro - LEDs. However, when the space between pixels is reduced, the light emitted from a single micro - LED can propagate laterally and reach the micro - LEDs adjacent to that single micro - LED, causing optical crosstalk between micro - LEDs.

Summary of the Invention

[0005] Embodiments of the present disclosure provide a micro-LED display panel. The micro-LED display panel includes a micro-LED array including a plurality of micro-LEDs and a plurality of electrical connection structures disposed around the plurality of micro-LEDs and electrically connected to the plurality of micro-LEDs. A plurality of light propagation channels are formed between adjacent micro-LEDs. Each light propagation channel includes at least one of a plurality of gaps defined between adjacent electrical connection structures. In a top view of the micro-LED array, the light propagation channels are bent.

[0006] Embodiments of the present disclosure also provide a micro-LED display panel. The micro-LED display panel includes a micro-LED array including a plurality of micro-LEDs and a plurality of electrical connection structures disposed around the plurality of micro-LEDs and electrically connected to the plurality of micro-LEDs. The plurality of electrical connection structures includes a first electrical connection structure and a second electrical connection structure adjacent to each other. The first electrical connection structure includes a first side surface facing the second electrical connection structure. The second electrical connection structure includes a second side surface facing the first electrical connection structure. Both the first side surface and the second side surface are non-linear.

[0007] Embodiments of the present disclosure further provide a method for reducing optical crosstalk between light-emitting units in a display panel. The display panel includes a plurality of light-emitting units and a plurality of electrical connection structures disposed around the plurality of light-emitting units and electrically connected to the plurality of light-emitting units. The electrical connection structures are spaced apart from each other to define a plurality of gaps therebetween. The method includes reflecting light emitted by one of the light-emitting units by at least a portion of one of the electrical connection structures disposed on the light propagation path of the light-emitting unit.

[0008] Embodiments and various aspects of the present disclosure are shown in the following detailed description and the accompanying drawings. The various features shown in the figures are not drawn to scale.

Brief Description of the Drawings

[0009]

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Figure 6A

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Figure 6C

Figure 6D

Figure 6E

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Figure 9A

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Embodiments for Carrying out the Invention

[0010] Here, exemplary embodiments will be referred to in detail, and the examples are shown in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements, unless otherwise indicated. The embodiments described in the following description of the exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with aspects related to the present invention described in the appended claims. Specific aspects of the present disclosure are described in more detail below. If there is a conflict with terms and / or definitions incorporated by reference, the terms and definitions provided in this specification shall prevail.

[0011] FIG. 1 schematically shows a top view of a micro-LED display panel 100 according to an embodiment of the present disclosure. Referring to FIG. 1, the micro-LED display panel 100 includes a micro-LED array 110 including a plurality of micro-LEDs 200 and a plurality of electrical connection structures 230 disposed around the plurality of micro-LEDs 200, and a driving backplane 120. The micro-LED array 110 is disposed on the upper surface of the driving backplane 120 to form an image display area. The driving backplane 120 is disposed on the back side of the micro-LED array 110. Among the driving backplane 120, the area where the micro-LED array 110 is not disposed is a non-functional area.

[0012] The driving backplane 120 is configured to control a plurality of micro LEDs 200. In some embodiments, the driving backplane 120 may be a TFT (thin film transistor) substrate or an IC (integrated circuit) substrate.

[0013] In the micro LED array 110, the plurality of micro LEDs 200 are arranged in an array on the upper surface of the driving backplane 120.

[0014] In the following description, as shown in the drawings, the direction in which the plurality of micro LEDs 200 are arranged along the upper surface of the driving backplane 120 is the X direction. The direction orthogonal to the X direction along the upper surface of the driving backplane 120 is the Y direction. The upper surface of the driving backplane 120 is arranged in the X-Y plane. The direction perpendicular to the X-Y plane is the Z direction.

[0015] The electrical connection structure 230 is electrically connected to the micro LED 200 to supply power to the micro LED 200. The electrical connection structure 230 can be made of, for example, a conductive and impermeable metal such as Al, Au, Rh, Ag, Cr, Ti, Pt, Sn, Cu, or a combination of two or more of these metal materials. The electrical connection structure 230 not only supplies power to the micro LED 200 but also reflects the light emitted from the micro LED 200.

[0016] The electrical connection structure 230 includes a plurality of upper electrical connection structures 231 and a plurality of lower electrical connection structures 232. As will be described in more detail with reference to FIGS. 2 to 5, each of the plurality of micro LEDs 200 includes two or more light-emitting mesas arranged in the vertical direction (Z direction) from top to bottom. The upper electrical connection structure 231 is electrically connected to the upper part of each of the two or more light-emitting mesas. Each of the lower electrical connection structures 232 is electrically connected to the bottom of one of the two or more light-emitting mesas.

[0017] In the embodiment shown in FIG. 1, the bottom electrical connection structure 232 further includes a plurality of first bottom electrical connection structures 232a disposed between adjacent micro-LEDs 200 arranged along the X direction, and a plurality of second bottom electrical connection structures 232b disposed between adjacent micro-LEDs 200 arranged along the Y direction. In some alternative embodiments, the first bottom electrical connection structure 232a may be disposed between adjacent micro-LEDs 200 arranged along the Y direction, and the second bottom electrical connection structure 232b may be disposed between adjacent micro-LEDs 200 arranged along the X direction.

[0018] FIG. 2 schematically shows a top view of a single micro-LED 200 and the electrical connection structure 230 around the single micro-LED 200 in the micro-LED array 110 of the embodiment of FIG. 1. FIG. 3 schematically shows a cross-sectional view of the structure of FIG. 2 along the cross-section line a-a'. FIG. 4 schematically shows a cross-sectional view of the structure of FIG. 2 along the cross-section line b-b'. FIG. 5 schematically shows a cross-sectional view of the structure of FIG. 2 along the cross-section line c-c' or cross-section line d-d'.

[0019] Referring to FIGS. 3 to 5, the micro-LED 200 includes at least two light-emitting mesas 210 stacked vertically (Z direction) from top to bottom, and conductive layers 220 located on the upper and lower surfaces of each light-emitting mesa 210. The conductive layer 220 includes an upper conductive layer 221 disposed above each light-emitting mesa 210 and a bottom conductive layer 222 disposed below each light-emitting mesa 210. For each light-emitting mesa 210, the upper conductive layer 221 is electrically connected to the upper surface of the light-emitting mesa 210, and the bottom conductive layer 222 is electrically connected to the bottom surface of the light-emitting mesa 210. The conductive layer 220 is used to supply power to the corresponding light-emitting mesa 210.

[0020] In the embodiments shown in FIGS. 3 to 5, at least two light-emitting mesas 210 include a first light-emitting mesa 211, a second light-emitting mesa 212, and a third light-emitting mesa 213 stacked vertically in the upward direction (Z direction) from the bottom, and the first light-emitting mesa 211 is disposed at the bottom. In some embodiments, the number of light-emitting mesas 210 may be two, four, or more than four. In some embodiments, the first light-emitting mesa 211 emits red light, the second light-emitting mesa 212 emits green light, and the third light-emitting mesa 213 emits blue light. In some embodiments, the first light-emitting mesa 211 emits red light, the second light-emitting mesa 212 emits blue light, and the third light-emitting mesa 213 emits green light. In some embodiments, the bottommost light-emitting mesa emits red light, and the uppermost light-emitting mesa emits green light. In some embodiments, different light-emitting mesas 210 within the same micro-LED 200 emit light of the same color. For example, the first light-emitting mesa 211, the second light-emitting mesa 212, and the third light-emitting mesa 213 within the same micro-LED 200 all emit blue, or all emit green or red. Among at least two light-emitting mesas 210 stacked along the vertical direction, adjacent light-emitting mesas 210 are spaced apart from each other in the vertical direction. In some embodiments, the distance between adjacent light-emitting mesas 210 along the vertical direction is the same. In some embodiments, the distance between adjacent light-emitting mesas 210 along the vertical direction may be set to be different as needed. In some embodiments, both the upper surface and the bottom surface of each light-emitting mesa 210 are circular, and the diameter of the upper surface of the light-emitting mesa 210 is smaller than the diameter of the bottom surface of the light-emitting mesa 210. For example, in the embodiments shown in FIGS. 3 to 5, for each of the first to third light-emitting mesas 211, 212, and 213, the diameter of the upper surface is smaller than the diameter of the bottom surface. In some embodiments, the upper surface and the bottom surface of the light-emitting mesa 210 may be non-circular such as square or elliptical. In some embodiments, the area of the upper surface of the light-emitting mesa 210 is smaller than the area of the bottom surface.

[0021] In some embodiments, at least two light-emitting mesas 210 are coaxially arranged. In other words, the projections of the light-emitting mesas 210 along the vertical direction overlap. In some embodiments, the sizes of the light-emitting mesas 210 may be different, and the projections of the light-emitting mesas 210 along the vertical direction may partially overlap.

[0022] Referring to FIGS. 2 to 5, the electrical connection structure 230 is disposed around the micro-LED 200. Each electrical connection structure 230 is electrically connected to at least one of the conductive layers 220 of the micro-LED 200 to supply electricity to the light-emitting mesa 210. The electrical connection structure 230 includes at least one upper electrical connection structure 231 and at least one bottom electrical connection structure 232. At least one upper electrical connection structure 231 is electrically connected to the upper conductive layer 221 of each light-emitting mesa 210. Each bottom electrical connection structure 232 is electrically connected to a bottom conductive layer 222 of one of the light-emitting mesas 210. The bottom of the upper electrical connection structure 231 contacts the driving backplane 120 but is not directly electrically connected to the driving backplane 120. The upper electrical connection structure 231 may electrically connect the upper conductive layer 221 and the negative electrode of an external power source. The bottom of each bottom electrical connection structure 232 contacts the driving backplane 120 and is electrically connected to the driving backplane 120. Each bottom electrical connection structure 232 may electrically connect the bottom conductive layer 222 and the positive electrode of an external power source.

[0023] Referring to FIG. 2, the bottom electrical connection structure 232 includes at least one first bottom electrical connection structure 232a and at least one second bottom electrical connection structure 232b. At least one first bottom electrical connection structure 232a is located along the direction of the cross-section line a-a' in FIG. 2, and at least one second bottom electrical connection structure 232b is located along the direction of the cross-section line b-b' in FIG. 2. The upper electrical connection structure 231 is located along the directions of the cross-section lines c-c' and d-d' in FIG. 2.

[0024] Referring to FIGS. 3 to 5, the bottom conductive layer 222 includes a first bottom conductive layer 222a, a second bottom conductive layer 222b, and a third bottom conductive layer 222c. The first bottom conductive layer 222a is located at the bottom of the first light-emitting mesa 211, the second bottom conductive layer 222b is located at the bottom of the second light-emitting mesa 212, and the third bottom conductive layer 222c is located at the bottom of the third light-emitting mesa 213. The upper conductive layer 221 includes a first upper conductive layer 221a, a second upper conductive layer 221b, and a third upper conductive layer 221c. The first upper conductive layer 221a is located above the first light-emitting mesa 211, the second upper conductive layer 221b is located above the second light-emitting mesa 212, and the third upper conductive layer 221c is located above the third light-emitting mesa 213.

[0025] The upper electrical connection structure 231 is electrically connected to all of the upper conductive layers 221 (i.e., the first upper conductive layer 221a, the second upper conductive layer 221b, and the third upper conductive layer 221c) of each micro-LED 200. The bottom electrical connection structure 232 is connected to one of the bottom conductive layers 222 (i.e., the first bottom conductive layer 222a, the second bottom conductive layer 222b, or the third bottom conductive layer 222c) of one of the micro-LEDs 200.

[0026] In the embodiment shown in FIG. 2, the number of the upper electrical connection structures 231 is four, two of which are arranged along the direction of the cross-section line c-c', and the other two are arranged along the direction of the cross-section line d-d'. The four upper electrical connection structures 231 are electrically connected to the upper conductive layers 221 (the first upper conductive layer 221a, the second upper conductive layer 221b, and the third upper conductive layer 221c) of all the light-emitting mesas 210 (the first light-emitting mesa 211, the second light-emitting mesa 212, and the third light-emitting mesa 213) of the micro-LED 200. The electrical connection structures 230 (including the four upper electrical connection structures 231, the first bottom electrical connection structure 232a, and the second bottom electrical connection structure 232b) are spaced apart from each other around the micro-LED 200, and the gap between adjacent electrical connection structures 230 is filled with an insulating medium 300.

[0027] Referring to FIGS. 2 to 5, some of the conductive layers 220 extend toward the corresponding electrical connection structures 230, contact the corresponding electrical connection structures 230, and make electrical connections to the corresponding electrical connection structures.

[0028] Specifically, as shown in FIGS. 2 and 5, all of the upper conductive layers 221 (221a, 221b, 221b) of the light-emitting mesa 210 (211, 212, 213) extend toward and contact the upper electrical connection structure 231 disposed around the micro LED 200, and are electrically connected to the upper electrical connection structure 231.

[0029] As shown in FIGS. 2 and 3, the second bottom conductive layer 222b of the second light-emitting mesa 212 extends toward and contacts one of the first bottom electrical connection structures 232a (i.e., the first bottom electrical connection structure 232a on the left side in FIG. 3), and is electrically connected to that one of the first bottom electrical connection structures 232a. The first bottom electrical connection structure 232a on the right side in FIG. 3 is connected to an adjacent micro LED.

[0030] As shown in FIGS. 2 and 4, the third bottom conductive layer 222c of the third light-emitting mesa 213 extends toward and contacts one of the second bottom electrical connection structures 232b (i.e., the second bottom electrical connection structure 232b on the left side in FIG. 4), and is electrically connected to that one of the second bottom electrical connection structures 232b. The second bottom electrical connection structure 232a on the right side in FIG. 4 is connected to an adjacent micro LED.

[0031] In the embodiments shown in FIGS. 2 to 5, the side surface of the electrical connection structure 230 is in contact with the end surface of the corresponding conductive layer 220. In some alternative embodiments, the electrical connection structure 230 may further include a protrusion that extends toward and contacts the corresponding conductive layer 220. The end surface of the protrusion may be in contact with the end surface of the corresponding conductive layer 220. Alternatively, the protrusion may overlap and contact the end of the corresponding conductive layer 220. In FIGS. 2 to 5, only an example of the shape of the extending portion of the conductive layer 220 is shown, but the extending portion of the conductive layer 220 may have various shapes and arrangements and is not limited to the examples shown in FIGS. 2 to 5. Further, for simplicity, the top view of the extending portion of the conductive layer 220 is shown only in FIG. 2 and not in FIG. 1.

[0032] Referring to FIG. 1, in some embodiments, the upper electrical connection structures 231 of adjacent micro LEDs 200 are electrically connected to each other, and the bottom electrical connection structures 232 of adjacent micro LEDs 200 are insulated from each other.

[0033] Referring to FIGS. 3 to 5, in some embodiments, the space between adjacent light-emitting mesas 210 and between the electrical connection structure 230 and the light-emitting mesa 210 is filled with an insulating medium 300. The insulating medium 300 is permeable. In some embodiments, the material of the insulating medium 300 may include one or a combination of SiO2, SiON, Al2O3, and SiN.

[0034] Referring to FIGS. 3 to 5, the micro LED 200 is located between the bottom-emitting mesa 210 (i.e., the first emitting mesa 211) and the driving backplane 120, and further includes a bottom connection mesa 240 electrically connected to both the driving backplane 120 and the bottom-emitting mesa 210 (i.e., the first emitting mesa 211). The micro LED 200 is located between the first emitting mesa 211 and the first upper conductive layer 221a, and further includes an upper connection mesa 214 electrically connected to both the first emitting mesa 211 and the first upper conductive layer 221a. The materials of the bottom connection mesa 240 and the upper connection mesa 214 are metals including one or more of Al, Au, Rh, Ag, Cr, Ti, Pt, Sn, Cu, AuSn, TiW, etc. In some embodiments, both the upper and lower surfaces of the emitting mesa 210 (mesas 211, 212, and 213) are circular, and the diameter of the upper surface of each emitting mesa 210 is smaller than the diameter of the bottom surface. In such an embodiment, the upper surface of the bottom connection mesa 240 is also circular, the diameter of the upper surface of the bottom connection mesa 240 is the same as the diameter of the bottom surface of the bottom-emitting mesa 210 (i.e., the first emitting mesa 211), and the diameter of the upper surface of the bottom connection mesa 240 is smaller than the diameter of the bottom surface of the bottom connection mesa 240. The first bottom conductive layer 222a is disposed between the bottom connection mesa 240 and the first emitting mesa 211, and may form an ohmic contact layer between the bottom connection mesa 240 and the first emitting mesa 211. The first bottom conductive layer 222a and the bottom connection mesa 240 can form an all-round mirror structure (omnidirectional reflector (ODR)) with high reflection efficiency.

[0035] The conductive layer 220 is transparent. Each of the conductive layers 220 may be any one of TCO (transparent conductive oxide) films such as an ITO (indium tin oxide) film, an AZO (antimony-doped zinc oxide) film, an ATO (antimony-doped tin oxide) film, an FTO (fluorine-doped tin oxide), or a combination of one or more.

[0036] Referring to FIGS. 3 to 5, the micro-LED 200 further includes an upper insulating dielectric layer 250. The upper insulating dielectric layer 250 continuously covers the upper surface of the micro-LED array 110. The upper insulating dielectric layer 250 is permeable, and the material of the upper insulating dielectric layer 250 is one or a combination of SiO2, SiN, SiON, or Al2O3.

[0037] Referring to FIGS. 3 to 5, the micro-LED 200 further includes a microlens 260. The microlens 260 is located above the upper insulating dielectric layer 250 and covers the pixel region of the micro-LED 200. The bottom diameter of the microlens 260 is larger than the maximum diameter of the light-emitting mesa 210. The thickness of the microlens 260 is 10 μm or less. In some embodiments, the material of the microlens 260 is selected from silicon dioxide, photoresist, and the like.

[0038] Referring to FIGS. 1 to 5, in some embodiments, the thickness of the light-emitting mesa 210 may be in the range of, for example, 0.3 μm to 3.5 μm, and the bottom diameter of the light-emitting mesa 210 may be in the range of, for example, 0.5 μm to 50 μm. The thickness of the micro-LED 200 may be in the range of, for example, 1 μm to 10 μm, and the diameter of the micro-LED 200 may be in the range of, for example, 2 μm to 200 μm. The size of the micro-LED display panel 100 may be in the range of, for example, 500 μm to 50000 μm. The resolution of the micro-LED array 110 in the micro-LED display panel 100 may be one of, for example, 320×240, 640×480, 1920×1080, or 2560×1440.

[0039] Referring to FIGS. 3 to 5, the driving backplane 120 includes a solder joint group 121 corresponding to the micro LED 200. The solder joint group 121 includes a first solder joint 1211, a second solder joint 1212, and a third solder joint 1213. The first solder joint 1211 corresponds to the bottom connection mesa 240 and is electrically connected to the bottom connection mesa 240. The second solder joint 1212 corresponds to the first bottom electrical connection structure 232a and is electrically connected to the first bottom electrical connection structure 232a. The third solder joint 1213 corresponds to the second bottom electrical connection structure 232b and is electrically connected to the second bottom electrical connection structure 232b.

[0040] Referring back to FIG. 1, an electrical connection structure 230 is disposed around each micro LED 200, and a gap 270 is defined between adjacent electrical connection structures 230 and filled with an insulating medium 300 (shown in FIGS. 3 to 5). Each of the gaps 270 is linear and extends along the direction in which the micro LEDs 200 are arranged, thereby forming an optical propagation channel for laterally propagating the light emitted from each micro LED 200. As a result, there is a risk of optical crosstalk occurring between adjacent micro LEDs 200. For example, as shown in FIG. 1, the gap 270 includes at least a first gap 271 between an upper electrical connection structure 231 and a first bottom electrical connection structure 232a adjacent to each other and arranged along the Y direction, and a second gap 272 between the upper electrical connection structure 231 and a second bottom electrical connection structure 232b adjacent to each other and arranged along the X direction. The first gap 271 is linear and extends along the X direction parallel to the direction in which the adjacent micro LEDs 200a and 200b are arranged. Therefore, the first gap 271 forms an optical propagation channel 371 through which the light emitted from the micro LED 200a can propagate and reach the micro LED 200b, and the light emitted from the micro LED 200b can propagate and reach the micro LED 200a. Similarly, the second gap 272 is linear and extends along the Y direction parallel to the direction in which the adjacent micro LEDs 200a and 200c are arranged. Therefore, the second gap 272 forms an optical propagation channel 372 through which the light emitted from the micro LED 200a can pass and reach the micro LED 200c, and the light emitted from the micro LED 200c can pass and reach the micro LED 200a. Therefore, the optical crosstalk between adjacent micro LEDs 200 is caused by the lateral light propagating through the linear gap 270 between adjacent electrical connection structures 230, and may reduce the light emission efficiency of the micro LED display panel 100.

[0041] To reduce optical crosstalk between adjacent micro-LEDs 200 due to the linear gap 270 between adjacent electrical connection structures 230, according to some embodiments of the present disclosure, the optical propagation channels formed between adjacent micro-LEDs are bent in a top view of the micro-LED array. As used in the present disclosure and the claims, the term "flexural" means that each optical propagation channel is bent, flexed, or curved, and is non-linear, i.e., not linear. The term "adjacent" means that there are no other objects between two adjacent objects other than the insulating medium 300. The optical propagation channel may include one or more gaps formed between adjacent electrical connection structures 230. In some embodiments, the sides of adjacent electrical connection structures 230 facing each other are also configured to be flexural, i.e., bent, flexed, or curved, and are substantially parallel to each other. As a result, the gap 270 defined between adjacent electrical connection structures 230 is bent. For example, as further described below, each upper electrical connection structure 231 is formed to have a "plus-shaped" cross-section, and each bottom electrical connection structure 232 is formed to have four sides (as a quadrilateral). As a result, each gap 270 may have at least two sections extending along directions that are not parallel to each other, and thus each gap 270 may be bent. As another example, each gap 270 may be curved or may include at least one curved section. Therefore, the optical propagation channel including at least one of the gaps 270 may be bent.

[0042] FIG. 6A schematically shows a top view of a micro LED array 600 according to an embodiment of the present disclosure. FIG. 6B schematically shows an enlarged top view of the micro LED array of FIG. 6A. FIG. 6C schematically shows a cross-sectional view of the structure of FIG. 6A along the cross-sectional line e-e'. FIG. 6D schematically shows a cross-sectional view of the structure of FIG. 6A along the cross-sectional line f-f'. FIG. 6E schematically shows a cross-sectional view of the structure of FIG. 6A along the cross-sectional line g-g'.

[0043] As shown in FIG. 6A, the micro-LED array 600 includes a plurality of micro-LEDs 200 and a plurality of electrical connection structures 230 disposed around the plurality of micro-LEDs 200 and electrically connected to the plurality of micro-LEDs 200. The plurality of electrical connection structures 230 includes a plurality of upper electrical connection structures 231 and a plurality of bottom electrical connection structures 232, which include a plurality of first bottom electrical connection structures 232a and a plurality of second bottom electrical connection structures 232b. The plurality of first bottom electrical connection structures 232a and the plurality of micro-LEDs 200 are alternately arranged along the X direction. The plurality of second bottom electrical connection structures 232b and the plurality of micro-LEDs 200 are alternately arranged along the Y direction. The plurality of upper electrical connection structures 231 and the plurality of first bottom electrical connection structures 232a are alternately arranged along the Y direction. The plurality of upper electrical connection structures 231 and the plurality of second bottom electrical connection structures 232b are alternately arranged along the X direction. A plurality of optical propagation channels 371, 372 are formed between adjacent micro-LEDs 200. A plurality of gaps 270 are defined between adjacent electrical connection structures 230. Each optical propagation channel 371 or 372 includes at least one of the gaps 270. As shown in the top view of the micro-LED array 600 in FIG. 6A, the optical propagation channels 371 and 372 are bent. Each upper electrical connection structure 231 is formed to have a "plus-shaped" cross section, and each bottom electrical connection structure 232 is formed to have four side surfaces substantially parallel to the side surfaces of the adjacent upper electrical connection structure 231 (as a quadrilateral). As a result, each of the gaps 270 defined between adjacent electrical connection structures 230 is bent and includes two sections extending along directions that are not parallel to each other, i.e., directions that intersect each other. Each gap 270 forms a bent optical propagation channel. Each of the bent optical propagation channels 270 reduces the intensity of light emitted from one of the micro-LEDs 200 and propagating through the optical propagation channel to its adjacent micro-LED 200.Specifically, as shown in FIG. 6A, the gap 270 includes at least a first gap 271 between the upper electrical connection structure 231 and the first bottom electrical connection structure 232a adjacent to each other and arranged along the Y direction, and a second gap 272 between the upper electrical connection structure 231 and the second bottom electrical connection structure 232b adjacent to each other and arranged along the X direction. The first gap 271 constitutes an optical propagation channel 371 between the micro LEDs 200a and 200b. The first gap 271 includes a first section 271a extending along a first direction A1 and a second section 271b extending along a second direction B1. The first direction A1 and the second direction B1 are not parallel to each other. In other words, the first direction A1 intersects the second direction B1. The angle θ1 between the first direction A1 and the second direction B1 is greater than 0° and less than 180°. Similarly, the second gap 272 constitutes an optical propagation channel 372 between the micro LEDs 200a and 200c. The second gap 272 includes a first section 272a extending along a first direction A2 and a second section 272b extending along a second direction B2. The first direction A2 and the second direction B2 are not parallel to each other. The angle θ2 between the first direction A2 and the second direction B2 is greater than 0° and less than 180°.

[0044] FIG. 6B schematically shows an enlarged top view of the micro LED array 600 of FIG. 6A. As shown in FIG. 6B, the upper electrical connection structure 231 includes a side surface 2310 facing the first bottom electrical connection structure 232a, and the first bottom electrical connection structure 232a includes a side surface 232a0 facing the side surface 2310 of the upper electrical connection structure 231. Both the side surface 2310 of the upper electrical connection structure 231 and the side surface 232a0 of the first bottom electrical connection structure 232a are non-linear, i.e., bent. The side surface 2310 of the upper electrical connection structure 231 includes sections 2311, 2312, and 2313 extending along different directions. At least one of the sections 2311, 2312, and 2313 is not parallel to the X direction. The side surface 232a0 of the first bottom electrical connection structure 232a includes sections 232a1, 232a2, and 232a3 extending along different directions. At least one of the sections 232a1, 232a2, and 232a3 is not parallel to the X direction. The first gap 271 is defined between the side surface 2310 of the upper electrical connection structure 231 and the side surface 232a0 of the first bottom electrical connection structure 232a. The side surface 2310 of the upper electrical connection structure 231 and the side surface 232a0 of the first bottom electrical connection structure 232a are adapted to each other. In other words, the sizes and angles of the sections 2311, 2312, and 2313 of the side surface 2310 of the upper electrical connection structure 231 correspond to the sizes and angles of the sections 232a1, 232a2, and 232a3 of the side surface 232a0 of the first bottom electrical connection structure 232a. The side surface 232a0 of the first bottom electrical connection structure 232a defines a protrusion protruding toward the first bottom electrical connection structure 232a. The side surface 2310 of the upper electrical connection structure 231 defines a recess for accommodating the protrusion defined by the side surface 232a0 of the first bottom electrical connection structure 232a.

[0045] As shown by the solid arrow “L1” in FIG. 6B, a part of the light L1 radiated from the micro-LED 200a along the X direction reaches the side surface 232a4 of the first bottom electrical connection structure 232a facing the micro-LED 200a, and a part of the light L1 is reflected by the side surface 232a4 of the first bottom electrical connection structure 232a and returned toward the micro-LED 200a. As shown by the white arrow “L2” in FIG. 6B, a part of the light L2 radiated from the micro-LED 200a enters the optical propagation channel 371 formed by the first gap 271 defined between the first bottom electrical connection structure 232a and the upper electrical connection structure 231, and before the light reaches the adjacent micro-LED 200b, it is reflected multiple times by the side walls of the first gap 271 formed by the side surface 2310 of the upper electrical connection structure 231 and the side surface 232a0 of the first bottom electrical connection structure 232a. Therefore, the intensity of the light L2 propagating through the optical propagation channel 371 and reaching the adjacent micro-LED 200b is significantly reduced after multiple reflections. As a result, the bent optical propagation channel 371 including the first gap 271 defined between the first bottom electrical connection structure 232a and the upper electrical connection structure 231 greatly reduces the optical crosstalk between the micro-LEDs 200a and 200b arranged along the X direction. Similarly, the bent optical propagation channel 372 including the bent second gap 272 defined between the second bottom electrical connection structure 232b and the upper electrical connection structure 231 can greatly reduce the optical crosstalk between the micro-LEDs 200a and 200c arranged along the Y direction. As a result, the light emission efficiency of the micro-LED array 110 can be improved.

[0046] FIG. 6C schematically shows a cross-sectional view of the structure of FIG. 6A along the section line e-e'. FIG. 6D schematically shows a cross-sectional view of the structure of FIG. 6A along the section line f-f'. FIG. 6E schematically shows a cross-sectional view of the structure of FIG. 6A along the section line g-g'. Since each of the micro LEDs 200 in FIGS. 6C to 6E has the same structure as the micro LEDs 200 in FIGS. 3 to 5, detailed descriptions will not be repeated. As shown in FIG. 6C, each first bottom electrical connection structure 232a is electrically connected to the second bottom conductive layer 222b of the micro LED 200. As shown in FIG. 6D, each second bottom electrical connection structure 232b is electrically connected to the third bottom conductive layer 222c of the micro LED 200. As shown in FIG. 6E, each upper electrical connection structure 231 is electrically connected to the first upper conductive layer 221a, the second upper conductive layer 221b, and the third upper conductive layer 221c of all the micro LEDs 200.

[0047] Referring back to FIG. 6A (none of FIGS. 6A to 6E are to scale), the width W of each of the first gap 271 and the second gap 272 may be in the range of 50 nm to 2000 nm. The smaller the width of the gap section, the better the gap can provide a light separation effect. The maximum dimension d1 along the Y direction of the first bottom electrical connection structure 232a is greater than or equal to the shortest distance d2 along the Y direction between adjacent upper electrical connection structures 231. The dimension d3 along the X direction of the second bottom electrical connection structure 232b is greater than or equal to the shortest distance d4 between two adjacent upper electrical connection structures 231 along the X direction.

[0048] In the embodiments shown in FIGS. 6A to 6E, each of the gaps 270 (including the first gap 271 and the second gap 272) includes two sections, and each section extends along a direction intersecting the direction in which the adjacent micro LEDs 200 are arranged. In some alternative embodiments, each gap may include three or more adjacent sections, and at least one of the sections extends along a direction intersecting the direction in which the adjacent micro LEDs 200 are arranged.

[0049] In the embodiments shown in FIGS. 6A to 6E, each of the bottom electrical connection structures 232 is formed (as a quadrilateral) to have four sides. In some alternative embodiments, each of the bottom electrical connection structures 232 may be formed to have more or fewer than four sides, and each of the top electrical connection structures 231 is formed to have a "plus-shaped" cross-section. FIG. 7 schematically shows a top view of a micro LED array 700 according to such an embodiment.

[0050] As shown in FIG. 7, each of the bottom electrical connection structures 232 (including the first bottom electrical connection structure 232a and the second bottom electrical connection structure 232b) is formed (as a hexagon) to have six sides. Two adjacent sides of the bottom electrical connection structure 232 are substantially parallel to two sides of the adjacent top electrical connection structure 231 having a "plus-shaped" cross-section, thereby defining a gap 270 that is non-linear and includes two sections that cross each other. The gap 270 includes a first gap 271 defined between the top electrical connection structure 231 and the first bottom electrical connection structure 232a adjacent to each other along the Y direction, and a second gap 272 defined between the top electrical connection structure 231 and the second bottom electrical connection structure 232b adjacent to each other along the X direction. The first gap 271 and the second gap 272 are non-linear, i.e., bent. Accordingly, each first gap 271 forms a bent optical propagation channel 371 between adjacent micro LEDs 200 arranged along the X direction, and each second gap 272 forms a bent optical propagation channel 372 between adjacent micro LEDs 200 arranged along the Y direction. Except for the shape of the bottom electrical connection structure 232, the other elements of the micro LED array 700 shown in FIG. 7 and their dimensions are the same as those of the elements of the micro LED array 600 shown in FIGS. 6A and 6B, and therefore, a detailed description of these elements will not be repeated.

[0051] In the embodiments shown in FIGS. 6A-6E and FIG. 7, each of the gaps 270 (including the first gap 271 and the second gap 272) includes a linear section. In some alternative embodiments, each of the gaps 270 may include at least one curved section, or each of the gaps 270 may be curved. FIG. 8 schematically shows a top view of a micro-LED array 800 according to such an embodiment.

[0052] As shown in FIG. 8, each upper electrical connection structure 231 is formed in a substantially square shape having four concave surfaces, and each lower electrical connection structure 232 is formed in a substantially rectangular shape having a convex surface facing the adjacent upper electrical connection structure 231. As a result, each of the gaps 270 (including the first gap 271 and the second gap 272) between the upper electrical connection structure 231 and the lower electrical connection structure 232 is curved, i.e., bent. Accordingly, the optical propagation channels 371 and 372 including the first gap 271 and the second gap 272 are each bent. The light emitted from the micro-LED 200a and entering the bent optical propagation channels 371 and 372 is reflected multiple times by the curved sidewalls of the curved gap 270 before the light reaches the adjacent micro-LEDs 200b or 200c. Thus, the intensity of the light reaching the adjacent micro-LEDs 200b or 200c is significantly reduced by the multiple reflections in the curved gap 270. Accordingly, the curved gap 270 reduces the optical crosstalk between adjacent micro-LEDs 200.

[0053] FIG. 9A schematically shows a top view of a micro-LED array 900A according to another embodiment of the present disclosure. As shown in FIG. 9A, each upper electrical connection structure 231 is formed to have a circular cross-section with a convex side surface facing an adjacent bottom electrical connection structure 232, and each bottom electrical connection structure 232 is formed to have an irregular shape that is substantially rectangular with all four side surfaces being partially concave. Two of the four concave surfaces of each bottom electrical connection structure 232 face adjacent micro-LEDs 200, and the curvature of these two side surfaces is substantially the same as the curvature of the adjacent side surfaces of the micro-LEDs 200 facing the bottom electrical connection structure 232. In some embodiments, the curvature of each side surface of the bottom electrical connection structure 232 and the micro-LEDs 200 is the same such that these two side surfaces are parallel to each other and the gap between the bottom electrical connection structure 232 and the adjacent micro-LEDs 200 has a uniform width. In some alternative embodiments, the curvature of these two side surfaces may be different such that these two side surfaces are not parallel to each other and the gap between the bottom electrical connection structure 232 and the adjacent micro-LEDs 200 has a non-uniform width. Similarly, the other two of the four concave surfaces of the bottom electrical connection structure 232 face adjacent upper electrical connection structures 231. The curvature of these other two side surfaces is generally the same as the curvature of the adjacent upper electrical connection structures 231. In some embodiments, the curvature of these two side surfaces is the same such that these two side surfaces are parallel to each other and the gap between the bottom electrical connection structure 232 and the adjacent upper electrical connection structures 231 has a uniform width. In some alternative embodiments, the curvature of these two side surfaces may be different such that these two side surfaces are not parallel to each other and the gap between the bottom electrical connection structure 232 and the adjacent upper electrical connection structures 231 has a non-uniform width.

[0054] As a result, the gap 270 defined between adjacent electrical connection structures 230 includes a first gap 271 defined between an adjacent upper electrical connection structure 231 and a first bottom electrical connection structure 232a, a second gap 272 defined between the adjacent upper electrical connection structure 231 and a second bottom electrical connection structure 232b, and a third gap 273 defined between the adjacent first bottom electrical connection structure 232a and the second bottom electrical connection structure 232b. Each of the first gap 271 and the second gap 272 is curved, i.e., bent. Each of the third gaps 273 is linear.

[0055] The optical propagation channel may be defined between adjacent micro LEDs arranged diagonally. As shown in FIG. 9A, the optical propagation channel 370 is defined between a micro LED 200a and a micro LED 200d arranged along a virtual diagonal line h-h'. The optical propagation channel 370 includes the first gap 271, the second gap 272, and third gaps 273a and 273b. Since the first gap 271 and the second gap 272 are curved, i.e., bent, the optical propagation channel 370 is bent. Light emitted from the micro LED 200a and entering the optical propagation channel 370 is reflected multiple times by the sidewalls of the gaps 271, 272, 273a, and 273b before the light reaches the adjacent micro LED 200d. Therefore, the intensity of the light reaching the adjacent micro LED 200d is significantly reduced by the multiple reflections in the gaps 271, 272, 273a, and 273b. As a result, the bent optical propagation channel 370 reduces the optical crosstalk between adjacent micro LEDs 200.

[0056] In the micro-LED array 900A, each of the third gaps 273 (including 273a and 273b) extends along a virtual diagonal line connecting the centers of adjacent ones of the diagonally arranged micro-LEDs 200. Further, the diagonally arranged ones among the third gaps 273 are aligned with each other. For example, as shown in FIG. 9A, both the third gap 273a and the third gap 273b extend along the diagonal line h-h' connecting the centers of adjacent ones of the diagonally arranged micro-LEDs 200a and 200d.

[0057] In some alternative embodiments, adjacent ones among the diagonally arranged third gaps 273a and 273b may extend in the same direction or may be parallel to each other. FIG. 9B schematically shows a partial top view of a micro-LED array 900B according to such an embodiment. As shown in FIG. 9B, the third gaps 273a and 273b extend in the same direction and are not aligned with the diagonal line h-h'. Thus, instead of being aligned with each other, the third gaps 273a and 273b are parallel to each other. In such an arrangement, the light radiated from the micro-LED 200a and entering the optical propagation channel 370 (including the first gap 271, the second gap 272, and the third gaps 273a and 273b) is reduced as compared with the arrangement in which the third gaps 273a and 273b are aligned with the diagonal line h-h'. As a result, the optical crosstalk between the diagonally arranged micro-LEDs 200a and 200d can be further reduced.

[0058] In some further alternative embodiments, adjacent ones of the diagonally arranged third gaps 273a and 273b may be aligned with each other, but may not be aligned with a virtual diagonal line connecting the centers of adjacent ones of the diagonally arranged micro LEDs 200. FIG. 9C schematically shows a partial top view of a micro LED array 900C according to such an embodiment. As shown in FIG. 9C, the third gap 273a is aligned with the third gap 273b, but the extending directions of the third gaps 273a and 273b are not connected to the centers of the micro LEDs 200, that is, not aligned with the diagonal line h-h'. In such an arrangement, the light radiated from the micro LED 200a and entering the optical propagation channel 370 (including the first gap 271, the second gap 272, and the third gaps 273a and 273b) is reduced as compared with an arrangement in which the third gaps 273a and 273b are aligned with the diagonal line h-h'. As a result, the optical crosstalk between adjacent micro LEDs 200 can be further reduced.

[0059] FIG. 10 schematically shows a top view of a micro-LED array 1000 according to another embodiment of the present disclosure. As shown in FIG. 10, each upper electrical connection structure 231 is formed to have a “plus-shaped” cross-section, and each bottom electrical connection structure 232 is formed to have an “L-shaped” cross-section. Each of the gaps 270 is non-linear and includes three sections, each section extending along a direction intersecting the direction in which an adjacent section extends, thereby reducing the intensity of light radiated from the micro-LED 200 and transmitted to its adjacent micro-LED 200. Specifically, as shown in FIG. 10, the gap 270 includes at least a first gap 271 between adjacent upper electrical connection structures 231 and a first bottom electrical connection structure 232a arranged along the Y direction, and a second gap 272 between adjacent upper electrical connection structures 231 and a second bottom electrical connection structure 232b arranged along the X direction. The first gap 271 constitutes an optical propagation channel 371 between the micro-LED 200a and the micro-LED 200b. The second gap 272 constitutes an optical propagation channel 372 between the micro-LED 200a and the micro-LED 200c. The first gap 271 includes a first section 271a extending along the X direction, a second section 271b extending along the Y direction, and a third section 271c extending along the X direction. Since the second section 271b extends along the Y direction intersecting the X direction in which the adjacent sections 271a and 271c extend, the optical propagation channel 371 is non-linear, that is, bent. The light radiated from the micro-LED 200a enters the bent optical propagation channel 371 and is reflected multiple times by the sidewalls of the first to third sections 271a to 271c of the first gap 271 while propagating through the optical propagation channel 371 before reaching the adjacent micro-LED 200b. Therefore, the intensity of the light propagating through the bent optical propagation channel 371 is significantly reduced. Similarly, the second gap 272 includes a first section 272a extending along the Y direction, a second section 272b extending along the X direction, and a third section 272c extending along the Y direction. Since the second section 272b extends along the X direction intersecting the Y direction in which the adjacent sections 272a and 272c extend, the optical propagation channel 372 is non-linear, that is, bent.The light emitted from the micro-LED 200a enters the optical propagation channel 372 and is reflected multiple times by the sidewalls of the first to third sections 272a to 272c of the second gap 272 while propagating through the optical propagation channel 372 before the light reaches the adjacent micro-LED 200c. Therefore, the intensity of the light propagating through the optical propagation channel 372 is significantly reduced. As a result, the bent optical propagation channel 371 reduces the optical crosstalk between the micro-LEDs 200a and 200b arranged along the X direction, and the bent optical propagation channel 372 reduces the optical crosstalk between the micro-LEDs 200a and 200c arranged along the Y direction, thereby improving the light emission efficiency of the micro-LED array 1000.

[0060] FIG. 11 schematically shows a top view of a micro-LED array 1100 according to an embodiment of the present disclosure. FIG. 12 schematically shows a top view of a single micro-LED 200' and an electrical connection structure 230 around the single micro-LED 200' within the micro-LED array 1100 shown in FIG. 11. FIG. 13 schematically shows a cross-sectional view of the structure of FIG. 11 along the cross-section line i-i'. FIG. 14 schematically shows a cross-sectional view of the structure of FIG. 11 along the cross-section line j-j'.

[0061] As shown in FIGS. 13 and 14, each micro-LED 200' includes two light-emitting mesas 210, namely, a first light-emitting mesa 211 and a second light-emitting mesa 212. As shown in FIGS. 12 to 14, the electrical connection structure 230 includes an upper electrical connection structure 231 (FIGS. 12 and 14) electrically connected to the upper conductive layers 221 (221a and 221b) of each light-emitting mesa 210 (211 and 212), and a bottom electrical connection structure 232 (FIGS. 12 and 13) electrically connected to the bottom conductive layer 222b of the second light-emitting mesa 212. Regarding the description of other components in FIGS. 12 to 14, reference can be made to the description of the components in FIGS. 2 to 5, which will not be repeated here.

[0062] Referring again to FIG. 11, each of the upper electrical connection structures 231 is disposed between adjacent micro LEDs 200' arranged along the X direction and extends along the Y direction. Each of the bottom electrical connection structures 232 is disposed between adjacent micro LEDs 200' arranged along the Y direction. The gap 270 is defined between adjacent electrical connection structures 230 arranged along the X direction, that is, between adjacent bottom electrical connection structures 232 and upper electrical connection structures 231. Each gap 270 may be non-linear, i.e., bent. That is, each gap 270 may have at least two sections extending along directions that are not parallel to each other, or each gap 270 may be curved or include at least one curved section.

[0063] For example, in the micro LED array 1100 shown in FIG. 11, the gap 270 between adjacent bottom electrical connection structure 232 and upper electrical connection structure 231 is non-linear and includes a first section 270a extending along a first direction A and a second section 270b extending along a second direction B. The first direction A and the second direction B are not parallel to each other. In other words, the first direction A intersects the second direction B. The angle θ formed by the first direction A and the second direction B is greater than 0° and less than 180°. The gap 270 constitutes an optical propagation channel 370 between the micro LED 200a' and the micro LED 200b'. Therefore, the light emitted from the micro LED 200a' enters the optical propagation channel 370 and is reflected multiple times by the sidewalls of the first section 270a and the second section 270b of the gap 270 while propagating through the optical propagation channel 370 before the light reaches the adjacent micro LED 200b'. Therefore, the bent optical propagation channel 370 reduces the optical crosstalk between the micro LEDs 200a' and 200b' arranged along the Y direction.

[0064] According to an embodiment of the present disclosure, the light propagation channel between adjacent micro LEDs includes a bent gap defined between the electrical connection structures. Thus, the multiple electrical connection structures can provide optical isolation, reducing crosstalk between adjacent micro LEDs and thereby improving light emitting efficiency.

[0065] In the foregoing specification, embodiments have been described with reference to numerous specific details that may vary from implementation to implementation. Certain adaptations and modifications of the described embodiments may be made. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered exemplary only, with the true scope and spirit of the invention being indicated by the following claims. It is also intended that the sequence of steps depicted in the figures is for illustrative purposes only and is not intended to be limited to the particular sequence of steps. Thus, one of ordinary skill in the art will appreciate that these steps may be performed in different orders while performing the same method.

[0066] In the drawings and specification, illustrative embodiments are disclosed. However, many variations and modifications to these embodiments are possible. Thus, although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A plurality of micro LEDs, and A plurality of electrical connection structures disposed around the plurality of micro LEDs and electrically connected to the plurality of micro LEDs A micro LED array comprising Comprising A plurality of optical propagation channels are formed between adjacent micro LEDs, each optical propagation channel includes at least one of a plurality of gaps defined between adjacent electrical connection structures, and In a top view of the micro LED array, the optical propagation channels are bent A micro LED display panel.

2. The micro LED display panel according to claim 1, wherein at least one of the plurality of gaps is non-linear in a top view.

3. At least one of the plurality of gaps includes at least a first section extending along a first direction and a second section extending along a second direction, The micro LED display panel according to claim 1, wherein the first direction intersects the second direction.

4. The micro LED display panel according to claim 3, wherein an angle formed by the first direction and the second direction is greater than 0° and less than 180°.

5. The micro LED display panel according to claim 1, wherein each of the plurality of micro LEDs includes two or more light-emitting mesas arranged vertically from top to bottom.

6. The micro LED display panel according to claim 5, wherein each of the plurality of micro LEDs further includes a dielectric material filled between the light-emitting mesas, around the electrical connection structures, and around the micro LEDs.

7. The micro LED display panel according to claim 5, wherein the plurality of electrical connection structures include a plurality of upper electrical connection structures configured to be electrically connected to the top of each of the two or more light-emitting mesas, and each of which is configured to be electrically connected to the bottom of one of the two or more light-emitting mesas. A plurality of bottom electrical connection structures.

8. The micro LED display panel according to claim 1, wherein at least one of the plurality of gaps includes a curved section.

9. The micro LED display panel according to claim 1, wherein at least one of the plurality of gaps is curved.

10. The micro-LED display panel according to claim 1, wherein each of the plurality of micro-LEDs includes a first light-emitting mesa, a second light-emitting mesa, and a third light-emitting mesa arranged vertically from top to bottom.

11. The micro-LED display panel according to claim 10, wherein the first light-emitting mesa emits blue light, the second light-emitting mesa emits green light, and the third light-emitting mesa emits red light.

12. The micro-LED display panel according to claim 10, wherein the first light-emitting mesa emits green light, the second light-emitting mesa emits blue light, and the third light-emitting mesa emits red light.

13. The micro-LED display panel according to claim 1, further comprising a driving backplane formed on the back surface of the micro-LED array and configured to control the plurality of micro-LEDs.

14. Each of the plurality of micro-LEDs includes two or more light-emitting mesas arranged vertically from top to bottom, The micro-LED display panel according to claim 13, wherein the micro-LED further includes a bottom connection mesa provided between the bottommost light-emitting mesa and the driving backplane.

15. The plurality of electrical connection structures each include a plurality of bottom electrical connection structures configured to be electrically connected to the bottom of one of the two or more light-emitting mesas, The driving backplane includes a first solder joint electrically connected to the bottom connection mesa, and a second solder joint electrically connected to at least one of the plurality of bottom electrical connection structures The micro-LED display panel according to claim 14.

16. The micro-LED display panel according to claim 1, further comprising an upper insulating dielectric layer continuously formed on the upper surface of the micro-LED array.

17. The micro-LED display panel according to claim 16, wherein the upper insulating dielectric layer is permeable.

18. The micro-LED display panel according to claim 16, further comprising a plurality of microlenses provided on the upper insulating dielectric layer and each covering one pixel display area of the micro-LEDs.

19. The micro-LED display panel according to claim 1, wherein the width of each of the gaps ranges from 50 nm to 2000 nm.

20. The plurality of electrical connection structures include a plurality of upper electrical connection structures and a plurality of bottom electrical connection structures that are alternately arranged along a first direction, The micro LED display panel according to claim 1, wherein a maximum dimension of one of the bottom electrical connection structures is equal to or greater than a shortest distance between the adjacent upper electrical connection structures along the first direction.

21. The plurality of electrical connection structures include a plurality of upper electrical connection structures and a plurality of bottom electrical connection structures, The plurality of bottom electrical connection structures include a plurality of first bottom electrical connection structures and a plurality of second bottom electrical connection structures, The plurality of first bottom electrical connection structures and the plurality of micro LEDs are alternately arranged along a first direction, The plurality of second bottom electrical connection structures and the plurality of micro LEDs are alternately arranged along a second direction, The plurality of upper electrical connection structures and the plurality of first bottom electrical connection structures are alternately arranged along the second direction, and The micro LED display panel according to claim 1, wherein the plurality of upper electrical connection structures and the plurality of second bottom electrical connection structures are alternately arranged along the first direction.

22. The plurality of gaps are a plurality of first gaps defined between the adjacent upper electrical connection structures and the first bottom electrical connection structures, and a plurality of second gaps defined between the adjacent upper electrical connection structures and the second bottom electrical connection structures The micro LED display panel according to claim 21, comprising.

23. The plurality of gaps are a plurality of third gaps defined between the adjacent first bottom electrical connection structures and the second bottom electrical connection structures The micro LED display panel according to claim 22, further comprising.

24. The micro LED display panel according to claim 23, wherein each of the third gaps extends along a virtual diagonal line connecting centers of adjacent ones of the diagonally connected micro LEDs.

25. The micro LED display panel according to claim 23, wherein adjacent ones of the diagonally arranged third gaps are parallel to each other.

26. [[ID=2,3]]The micro LED display panel according to claim 23, wherein adjacent ones of the diagonally arranged third gaps are aligned with each other.

27. The micro-LED display panel according to claim 23, wherein the extending directions of adjacent ones of the diagonally arranged third gaps do not follow a virtual diagonal line connecting the centers of adjacent ones of the diagonally connected micro-LEDs.

28. A plurality of micro-LEDs, and a plurality of electrical connection structures arranged around the plurality of micro-LEDs and electrically connected to the plurality of micro-LEDs A micro-LED array comprising comprising wherein the plurality of electrical connection structures include a first electrical connection structure and a second electrical connection structure adjacent to each other, the first electrical connection structure includes a first side surface facing the second electrical connection structure, the second electrical connection structure includes a second side surface facing the first electrical connection structure, and both the first side surface and the second side surface are non-linear, A micro-LED display panel.

29. The micro-LED display panel according to claim twenty-eight, wherein the first side surface of the first electrical connection structure and the second side surface of the second electrical connection structure are adapted to each other.

30. The micro-LED display panel according to claim twenty-eight, wherein a gap is defined between the first side surface of the first electrical connection structure and the second side surface of the second electrical connection structure.

31. The micro-LED display panel according to claim thirty, wherein the width of the gap ranges from 50 nm to 2000 nm.

32. The micro-LED display panel according to claim twenty-eight, wherein the first side surface of the first electrical connection structure defines a protruding portion protruding toward the second electrical connection structure, and the second side surface of the second electrical connection structure defines a recessed portion recessed to accommodate the protruding portion.

33. The micro-LED display panel according to claim twenty-eight, wherein the first side surface of the first electrical connection structure has a convex shape and the second side surface of the second electrical connection structure has a concave shape.

34. The first electrical connection structure and the second electrical connection structure are arranged along a first direction, and each of the first side surface of the first electrical connection structure and the second side surface of the second electrical connection structure includes at least one section that is not parallel to a second direction orthogonal to the first direction.

35. The micro LED display panel according to claim 28, wherein each of the first side surface of the first electrical connection structure and the second side surface of the second electrical connection structure includes at least two sections extending along different directions.

36. The micro LED display panel according to claim 28, wherein each of the first side surface of the first electrical connection structure and the second side surface of the second electrical connection structure includes a curved section.

37. The micro LED display panel according to claim 28, wherein the plurality of electrical connection structures include a plurality of first electrical connection structures and a plurality of second electrical connection structures arranged alternately along a first direction.

38. The micro LED display panel according to claim 37, wherein a maximum dimension along the first direction of one of the first electrical connection structures is not less than a shortest distance between the second electrical connection structures adjacent thereto along the first direction.

39. A method for reducing optical crosstalk between light emitting units in a display panel, wherein the display panel includes a plurality of light emitting units, and a plurality of electrical connection structures arranged around the plurality of light emitting units and electrically connected to the plurality of light emitting units, the plurality of electrical connection structures being spaced apart from each other so as to define a plurality of gaps therebetween and comprising, wherein the method includes reflecting light emitted by one of the light emitting units by at least a part of one of the electrical connection structures arranged on an optical propagation path of the light emitting unit and is a method.

40. The reflecting of the light includes reflecting the light by at least a part of at least one of the adjacent electrical connection structures after a part of the light emitted by the light emitting unit enters the gap between the adjacent electrical connection structures, and is the method according to claim 39.

41. The reflecting of the light includes reflecting a part of the light by the one of the electrical connection structures arranged on the optical propagation path of the light emitting unit and returning the light toward the light emitting unit, and is the method according to claim 39.

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