CN115274976B - Micro LED display structure and manufacturing method thereof - Google Patents

Abstract

The invention provides a micro LED display structure and a manufacturing method thereof, and relates to the technical field of LED display. The invention provides a micro LED display structure, which comprises a display area and a non-display area, wherein an arc-shaped edge is arranged between the display area and the non-display area; the pixel limiting layer limits at least one first pixel hole and at least one second pixel hole, and when the first pixel hole and the second pixel hole are adjacently arranged in the first direction and viewed from top, the edge of the second pixel hole is closer to the arc-shaped edge than the edge of the first pixel hole; the second pixel aperture has a first edge closest to the curved edge, the first edge being a curved edge and parallel to the profiled edge. Therefore, the display at the arc edge does not have a jagged boundary, and the display effect is improved.

Description

A micro-LED display structure and manufacturing method thereof

technical field

The invention relates to the technical field of micro-LED display, in particular to a micro-LED display structure and a manufacturing method thereof.

Background technique

With the diversification of display requirements, the shape of the display area of the mini-LED or micro-LED micro-LED display structure often presents various graphics, such as arc-shaped special-shaped edges at the corners of the display area, or near the camera. Round or curved profiled edges. When these circular or arc-shaped irregular edges are displayed, jagged shadows will appear due to the uneven arrangement of pixels on the edges, thus degrading the perception of the display.

Contents of the invention

Based on solving the above problems, the present invention provides a micro-LED display structure, which includes a display area and a non-display area, and there is an arc edge between the display area and the non-display area; the micro-LED display structure has: A driving substrate with a circuit layer on the driving substrate; a pixel defining layer arranged on the driving substrate, the pixel defining layer defines at least one first pixel hole and at least one second pixel hole, and the first pixel The holes are arranged adjacent to the second pixel holes in the first direction; a plurality of micro LED chips are arranged in the first pixel holes and the second pixel holes in one-to-one correspondence; the sealant is filled in the In the first pixel hole and the second pixel hole; the cover plate is bonded to the pixel defining layer; when viewed from above, compared with the first pixel hole, the edge of the second pixel hole is closer to the arc shaped edge; the second pixel hole has a first side closest to the arc-shaped edge, and the first side is an arc-shaped edge parallel to the shaped edge.

In this embodiment, a second pixel hole different from other positions is provided at a position close to the arc edge, and the second pixel hole has an arc edge conformal to the arc edge, so that the The arc-shaped edges of multiple second pixel holes are connected to form a roughly arc-shaped light-emitting boundary. Compared with the edges of pixel holes of other shapes such as straight lines or broken lines, the display on the arc-shaped edges will not have a jagged border, which improves display effect.

Further, the plurality of micro LED chips are arranged in an array, and the distance between two adjacent micro LED chips is equal. That is, multiple LED chips in the first pixel hole and the second pixel hole are arranged in an array with the same pitch, so that when transferring multiple LED chips in large quantities, only a single template is needed, and no additional settings are required. Transfer template.

Further, the second pixel hole also includes two opposite second and third sides connected to the first side and a fourth side connected to the second and third sides; , the first pixel hole has a rectangular shape and has opposite fifth and sixth sides; wherein, the length of the fourth side is equal to the length of the fifth and sixth sides. The length of the first side is greater than the length of the fourth side. In this way, the area of the second pixel hole close to the edge gradually increases along the direction toward the arc edge, so that the light will not be excessively concentrated, and the edge light will diverge and emit, improving the overlap of emitted light between the two second pixel holes. Ensure that the light output at the edge of the arc is uniform.

Further, between two adjacent rows, the shortest distance between the edges of two adjacent second pixel holes is smaller than the shortest distance between the edges of two adjacent first pixel holes. In this way, the light emitting area of the second pixel hole is larger than the light emitting area of the first pixel hole, so that the light emitting range of the pixel at the arc edge is large, and the dark stripe distance between two pixels is small.

Further, along the direction toward the arc-shaped edge, the thickness of the pixel defining layer gradually decreases. That is, the height of the pixel definition layer closer to the arc edge is lower, so that the light gradually weakens the pixel boundary from the inside to the arc edge, and the boundary between the second pixel holes around the arc edge is blurred, so that the arc edge The jaggy display becomes less obvious, and the edge display effect is enhanced.

Further, the pixel defining layer forming the second pixel hole has an inclined upper surface, and the upper surface faces the arc edge. A reflective layer is formed on the upper surface. The reflective layer is arranged toward the curved edge to make the dark shadow of the edge light less obvious, so as to further eliminate the jagged display.

Description of drawings

FIG. 1 is a schematic diagram of an existing micro LED display structure;

2 is a schematic diagram of a micro LED display structure according to the first embodiment of the present invention;

Fig. 3 is a sectional view along line C1C2 in Fig. 2;

4 is a schematic diagram of a micro LED display structure according to a second embodiment of the present invention;

Fig. 5 is a sectional view along line C1C2 in Fig. 4 .

Explanation of reference signs:

10/20, micro LED display structure; 11, pixel hole; 12, arc edge; 21, first pixel hole; 22, second pixel hole; 23, arc edge; 30, driving substrate; 31, thin film transistor; 32. Circuit layer; 33. Micro LED chip; 34. Pixel definition layer; 35. Cover plate.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure.

Referring to FIG. 1 for the prior art, the display area of the micro-LED display structure 10 includes a plurality of pixel holes 11 , and the pixel holes 11 define each pixel point, wherein each pixel point has the same luminous brightness. There is an arc edge 12 at the junction of the display area and the non-display area, and the arc edge 12 may be arc. In addition, it can be understood that the arc edge 12 may also be circular or S-shaped. Since the pixels are in the form of point light sources, they appear as a jagged structure near the arc edge 12, and the display effect is not good.

To this end, the first embodiment of the present invention discloses a micro LED display structure, which includes a display area and a non-display area, and there is an arc edge between the display area and the non-display area; the micro LED display The structure has: a driving substrate with a circuit layer on the driving substrate; a pixel defining layer arranged on the driving substrate, and the pixel defining layer defines at least one first pixel hole and at least one second pixel hole, the The first pixel hole and the second pixel hole are arranged adjacent to each other in the first direction; a plurality of micro LED chips are arranged in the first pixel hole and the second pixel hole in one-to-one correspondence; the sealant is filled In the first pixel hole and the second pixel hole; the cover plate is bonded to the pixel defining layer; when viewed from above, compared with the first pixel hole, the edge of the second pixel hole is closer to The arc edge; the second pixel hole has a first side closest to the arc edge, and the first side is an arc edge and is parallel to the arc edge.

First Embodiment Referring to FIG. 2 and FIG. 3 , the micro LED display structure 20 of the present invention has an arc-shaped edge as in the prior art, and the arc-shaped edge is located at the junction of the display area and the non-display area. There are a plurality of pixel holes defined by the pixel definition layer 34 in the display area, and the plurality of pixel holes include a plurality of first pixel holes 21 and a plurality of second pixel holes 22 . Wherein, the plurality of first pixel holes 21 have the same area and are all square holes.

Different from the first pixel holes 21, the plurality of second pixel holes 22 are special-shaped holes, and the special-shaped holes include a first side, and the first side is an arc-shaped side, wherein the arc-shaped side is closest to the arc-shaped edge, and is in line with the arc-shaped The shapes of the edges are parallel. In this way, the arc edges of the plurality of second pixel holes 22 close to the arc edges are connected to form a roughly arc-shaped light-emitting boundary. Compared with the edges of pixel holes in other shapes such as straight lines or zigzag lines, the display on the arc edges is not as good. There will be a jagged border to improve the display effect.

In each row, the second pixel hole 22 is closer to the shaped edge than the first pixel hole 21 of the same row. The second pixel hole 22 also includes two opposite second and third sides connected to the first side (that is, the arc-shaped side) and a fourth side connected to the second and third sides , the fourth side is set opposite to the first side; when viewed from above, the first pixel hole 21 is in the shape of a rectangle, and has opposite fifth and sixth sides; wherein, the length of the fourth side is equal to the The length of the fifth and sixth sides, and the fourth side is parallel to the fifth and sixth sides.

Further, the length of the first side is greater than the length of the fourth side. Wherein, the extension line of the second side and the third side has an intersection, and the intersection is located on the side of the second pixel hole 22 away from the arc edge, so that the light emitting area of the second pixel hole 22 is along the direction toward the arc edge Increasing gradually, this reduces the spacing between edge pixels and reduces jagged shadows that appear. According to the above setting, between two adjacent rows, the shortest distance between the edges of two adjacent second pixel holes 22 is smaller than the shortest distance between the edges of two adjacent first pixel holes 21 .

Each of the first pixel hole 21 and the second pixel hole 22 has a micro LED chip 33 arranged in an array, and the light emitted by the LED chip 33 is limited by the pixel hole to form a pixel point. The spacing between the plurality of micro LED chips 33 is exactly the same, and the mounting and welding of the micro LED chips 33 is realized by using the same massive transfer template, without additional transfer process at the edge.

Referring further to FIG. 3 , the pixel definition layer 34 is formed on the driving substrate 30, which includes a carrier, a buffer, and a multi-layer dielectric layer, wherein a plurality of thin film transistor units 31 are formed in the driving substrate 30 to electrically connect to the circuit layer 32 on the driving substrate 30 . The circuit layer 32 is patterned to electrically connect multiple micro LED chips 33 , so as to realize multiple thin film transistor units 31 driving multiple micro LED chips 33 respectively.

The pixel holes are filled with sealant, and the first pixel hole 22 and the second pixel hole 21 are filled with sealant, so as to realize the sealing of each micro LED chip 33 . Further, a cover plate 35 is bonded on the sealant and the pixel defining layer 33, and the cover plate 35 may be transparent glass.

Preferably, referring to FIG. 2 and FIG. 3 , along the direction toward the arc edge, the thickness of the pixel defining layer 34 gradually decreases, so that the boundaries between pixels closer to the arc edge are blurred. , which further reduces jagged shadows displayed by curved edges.

As a preference, the second embodiment of the present invention discloses a micro LED display structure, referring to Fig. 4 and Fig. 5 for details, the micro LED display structure 20 of this embodiment is basically the same as the micro LED display structure of the first embodiment, It has a profiled edge as in the prior art, and the profiled edge is located at the junction of the display area and the non-display area. There are a plurality of pixel holes defined by the pixel definition layer 34 in the display area, such as the plurality of first pixel holes 21 and the plurality of second pixel holes 22 in FIG. 4 and FIG. 5 , all of which are square holes. The second pixel hole 22 is closer to the edge of the special shape than the first pixel hole 21 in the same line, and the area and shape of the second pixel hole 22 may be the same as the area and shape of the first pixel hole. Preferably, the area and shape of the second pixel hole 22 can be the same as that of the second pixel in the first embodiment, that is, a plurality of second pixel holes 22 are special-shaped holes, and the special-shaped hole includes a first side, and the first side is The arc edge, where the arc edge is closest to the arc edge and is parallel to the shape of the arc edge. In this way, the arc edges of the plurality of second pixel holes 22 close to the arc edges are connected to form a roughly arc-shaped light-emitting boundary. Compared with the edges of pixel holes in other shapes such as straight lines or zigzag lines, the display on the arc edges is not as good. There will be a jagged border to improve the display effect.

In particular, different from the first embodiment, the pixel defining layer 34 forming the second pixel hole 22 has an inclined upper surface, and the upper surface faces the arc edge. In this way, the thickness of the pixel defining layer 34 gradually decreases along the direction toward the arc edge, and there is a reflective layer 36 on the inclined upper surface of the pixel defining layer 24 near the arc edge. The layer 36 is a metal reflective material, so as to realize the light emission angle of the second pixel hole 22 at the arc edge, realize a large-area light emission of the special-shaped edge, and further suppress the jagged display defect of the special-shaped edge.

Referring further to FIG. 5 , the pixel definition layer 34 is formed on the driving substrate 30 , the driving substrate 30 includes a carrier plate, a buffer, and a multi-layer dielectric layer, wherein a plurality of thin film transistor units 31 are formed in the driving substrate 30 to electrically connect to the circuit layer 32 on the driving substrate 30 . The circuit layer 32 is patterned to electrically connect multiple micro LED chips 33 , so as to realize multiple thin film transistor units 31 driving multiple micro LED chips 33 respectively.

The pixel holes are filled with sealant, and the first pixel hole 22 and the second pixel hole 21 are filled with sealant, so as to realize the sealing of each micro LED chip 33 . Further, a cover plate 35 is bonded on the sealant and the pixel defining layer 33, and the cover plate 35 may be transparent glass.

The embodiment of the present invention utilizes the larger second pixel hole of the special-shaped edge to enlarge the pixel point at the corresponding position, so as to prevent the light output from the pixel point on the edge from being too concentrated, which is closer to the surface light source or line light source, rather than other parts. point Light. When the pixels on the edge of the irregular shape are surface light sources or line light sources with large light-emitting area and low brightness, the jagged display boundary can be effectively reduced.

In another preferred embodiment, two micro-LED chips can be arranged in the second pixel hole, so as to further prevent the luminous brightness of the pixel near the edge of the irregular shape from being too high and the luminous brightness of the adjacent pixels, so as to reduce the jagged display At the same time, ensure that the border display brightness is not too dark.

In addition, the pitches of the plurality of micro-LED chips in the present invention are exactly the same, and the mass transfer of a plurality of micro-LED chips can be realized in one step by using one mass transfer template.

Finally, it should be noted that obviously, the above-mentioned embodiments are only examples for clearly illustrating the present invention, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims (5)

1. A micro LED display structure comprising a display area and a non-display area with an arcuate edge therebetween; the micro LED display structure has:

the driving substrate is provided with a circuit layer;

the pixel limiting layer is arranged on the driving substrate and limits at least one first pixel hole and at least one second pixel hole, and the first pixel hole and the second pixel hole are adjacently arranged in a first direction;

the micro LED chips are respectively arranged in the first pixel holes and the second pixel holes in a one-to-one correspondence manner;

the sealant is filled in the first pixel hole and the second pixel hole;

a cover plate bonded on the pixel defining layer;

wherein, when viewed from above, the edge of the second pixel hole is closer to the arc edge than the first pixel hole; the second pixel hole has a first edge closest to the arc-shaped edge, the first edge being an arc-shaped edge and parallel to the arc-shaped edge;

between two adjacent rows, the closest distance between two adjacent second pixel hole edges is smaller than the closest distance between two adjacent first pixel hole edges; the pixel defining layer forming the second pixel hole has an inclined upper surface facing the arc-shaped edge; wherein a light reflecting layer is formed on the upper surface.

2. The micro LED display structure of claim 1, wherein: the plurality of micro LED chips are arranged in an array mode, and the distance between every two adjacent micro LED chips is equal.

3. The micro LED display structure of claim 1, wherein: the second pixel hole further comprises two oppositely arranged second sides and third sides connected to the first sides and a fourth side connected to the second sides and the third sides; when viewed from the top, the first pixel hole is rectangular and is provided with a fifth side and a sixth side which are opposite; wherein the length of the fourth side is equal to the length of the fifth side and the sixth side.

4. The micro LED display structure of claim 3, wherein: the length of the first side is greater than the length of the fourth side.

5. The micro LED display structure of claim 1, wherein: the thickness of the pixel defining layer gradually decreases in a direction toward the arc-shaped edge.

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