CN115274976B - Micro LED display structure and manufacturing method thereof - Google Patents
Micro LED display structure and manufacturing method thereof Download PDFInfo
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- CN115274976B CN115274976B CN202211218706.6A CN202211218706A CN115274976B CN 115274976 B CN115274976 B CN 115274976B CN 202211218706 A CN202211218706 A CN 202211218706A CN 115274976 B CN115274976 B CN 115274976B
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- 238000004519 manufacturing process Methods 0.000 title abstract description 4
- 239000000758 substrate Substances 0.000 claims description 15
- 239000000565 sealant Substances 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 239000010409 thin film Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
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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
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
With the diversification of display requirements, the shape of the display area of the mini-LED or micro-LED display structure often presents various figures, such as an arc-shaped irregular edge at the corner of the display area or a round or arc-shaped irregular edge near the camera. These rounded or curved shaped edges, when displayed, can appear as jagged shadows due to uneven pixel placement of the edges, thus reducing the look and feel of the display.
Disclosure of Invention
In order to solve the above problems, the present invention provides a micro LED display structure, which includes a display area and a non-display area, wherein an arc-shaped edge is formed between the display area and the non-display area; 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 hole and the second pixel hole 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; when viewed from above, the edge of the second pixel hole is closer to the arc-shaped edge than 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 shaped edge.
In this embodiment, the second pixel holes different from the second pixel holes at other positions are disposed near the arc edge, and the second pixel holes have arc edges conformal with the arc edge, so that the arc edges of the second pixel holes near the arc edge are connected to form a substantially arc light-emitting boundary.
Furthermore, the plurality of micro LED chips are arranged in an array manner, and the distance between two adjacent micro LED chips is equal. The LED chips in the first pixel hole and the second pixel hole are arranged in an array mode and have the same interval, and therefore when the LED chips are transferred in a large quantity, the LED chips can be transferred only through a single template without additionally arranging other transfer templates.
Further, the second pixel hole further includes two oppositely disposed second and third sides connected to the first side and a fourth side connecting the second and third sides; when viewed from 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. The length of the first side is greater than the length of the fourth side. So set up, the area that is close to the second pixel hole at edge is along the direction crescent towards the arc edge to make light can not excessively concentrate, marginal light emits out, improves the emitting light coincidence degree between two second pixel holes, guarantees that the light-emitting at arc edge is even.
Further, 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. Therefore, the light emitting area of the second pixel hole is larger than that of the first pixel hole, the light emitting range of the pixels at the arc-shaped edge is large, and the dark stripe distance between the two pixels is small.
Further, the thickness of the pixel defining layer is gradually reduced in a direction toward the arc edge. The height of the pixel limiting layer which is closer to the arc-shaped edge is lower, so that the light gradually weakens the boundary of the pixel point from the inside to the arc-shaped edge, and the boundary between the second pixel holes at the periphery of the arc-shaped edge is fuzzified, so that the sawtooth display of the arc-shaped edge becomes unobvious, and the edge display effect is enhanced.
Further, the pixel defining layer forming the second pixel hole has an inclined upper surface facing the arc-shaped edge. A light reflecting layer is formed on the upper surface. The light reflecting layer is arranged towards the arc-shaped edge, so that the shadow of the light emitted from the edge becomes less obvious, and the sawtooth display is further eliminated.
Drawings
FIG. 1 is a schematic diagram of a conventional micro LED display structure;
FIG. 2 is a schematic diagram of a micro LED display structure according to a first embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line C1C2 of FIG. 2;
FIG. 4 is a schematic diagram of a micro LED display structure according to a second embodiment of the present invention;
fig. 5 is a cross-sectional view taken along line C1C2 in fig. 4.
Description of reference numerals:
10/20, micro LED display structure; 11. a pixel hole; 12. an arcuate edge; 21. a first pixel hole; 22. a second pixel hole; 23. an arc-shaped edge; 30. a drive substrate; 31. a thin film transistor; 32. a circuit layer; 33. a micro LED chip; 34. a pixel defining layer; 35. and a cover plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure.
Referring to fig. 1, a display area of a micro LED display structure 10 includes a plurality of pixel holes 11, where the pixel holes 11 define each pixel point, and a light emitting brightness of each pixel point is the same. An arc-shaped edge 12 is arranged at the boundary of the display area and the non-display area, and the arc-shaped edge 12 can be arc-shaped, and it is understood that the arc-shaped edge 12 can also be round, S-shaped or the like. Because the pixel point is in the form of a point light source, the display is in a sawtooth structure near the arc-shaped edge 12, and the display effect is not good.
To this end, a first embodiment of the present invention discloses a micro LED display structure, which includes a display area and a non-display area, with an arc-shaped edge between the display area and the non-display area; 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 hole and the second pixel hole 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; when viewed from above, the edge of the second pixel hole is closer to the arc-shaped 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.
First embodiment referring to fig. 2 and 3, the micro LED display structure 20 of the present invention has an arc-shaped edge at the boundary of a display area and a non-display area as in the prior art. In the display area, there are a plurality of pixel holes defined by the pixel defining layer 34, and the plurality of pixel holes include a plurality of first pixel holes 21 and a plurality of second pixel holes 22. The first pixel holes 21 have the same area and are square holes.
Unlike the first pixel hole 21, the plurality of second pixel holes 22 are shaped holes including a first edge that is an arc-shaped edge, wherein the arc-shaped edge is closest to the arc-shaped edge and is parallel to the shape of the arc-shaped edge. Thus, the arc-shaped edges of the second pixel holes 22 close to the arc-shaped edge are connected to form a substantially arc-shaped light-emitting boundary, and compared with the edges of pixel holes in other shapes such as a straight line shape or a broken line shape, the display at the arc-shaped edge does not have a jagged boundary, thereby improving the display effect.
In each row the second pixel apertures 22 are closer to the profiled edge than the first pixel apertures 21 of the same row. The second pixel hole 22 further includes two oppositely disposed second and third sides connected to the first side (i.e., the arc-shaped side) and a fourth side connected to the second and third sides, the fourth side being disposed opposite to the first side; the first pixel hole 21 has a rectangular shape in a plan view, and has fifth and sixth sides opposite to each other; wherein the length of the fourth side is equal to the length of the fifth side and the sixth side, and the fourth side is parallel to the fifth side and the sixth side.
Further, the length of the first side is greater than the length of the fourth side. Wherein, the extension lines of the second side and the third side have an intersection point, and the intersection point is located on one side of the second pixel hole 22 far from the arc-shaped edge, so that the light emitting area of the second pixel hole 22 is gradually increased along the direction towards the arc-shaped edge, thus the distance between the edge pixels can be reduced, and the displayed zigzag shadow can be reduced. According to the above arrangement, the closest distance between the edges of two adjacent second pixel holes 22 is smaller than the closest distance between the edges of two adjacent first pixel holes 21 between two adjacent rows.
Each of the first pixel hole 21 and the second pixel hole 22 has one micro LED chip 33 therein, the micro LED chips 33 are arranged in an array, and light emitted by the LED chips 33 is defined by the pixel holes to form pixel points. The pitches between the multiple micro LED chips 33 are completely the same, and the same one huge transfer template is used to realize the mounting and welding of the micro LED chips 33 without performing an additional transfer process on the edge.
Referring further to fig. 3, the pixel defining layer 34 is formed on the driving substrate 30, and the driving substrate 30 includes a carrier, a buffer, and a plurality of dielectric layers, wherein a plurality of thin film transistor units 31 are formed in the driving substrate 30 to be electrically connected to the circuit layer 32 on the driving substrate 30. The circuit layer 32 is patterned to electrically connect the plurality of micro LED chips 33, respectively, so as to realize that the plurality of thin film transistor units 31 drive the plurality of micro LED chips 33, respectively.
The pixel holes are filled with a sealant, and the first pixel hole 22 and the second pixel hole 21 are filled with the sealant, so as to seal 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 a transparent glass.
Preferably, referring to fig. 2 and 3, the pixel defining layer 34 has a thickness that decreases in a direction toward the curved edge, such that the boundaries between pixels closer to the curved edge are more blurred, thereby further reducing the jagged appearance of the curved edge.
Preferably, the second embodiment of the present invention discloses a micro LED display structure, and referring to fig. 4 and 5 in particular, the micro LED display structure 20 of the present embodiment is substantially the same as the micro LED display structure of the first embodiment, and has a shaped edge as in the prior art, and the shaped edge is located at the boundary between the display area and the non-display area. In the display area, there are a plurality of pixel holes defined by the pixel defining layer 34, such as the plurality of first pixel holes 21 and the plurality of second pixel holes 22 in fig. 4 and 5, which are each a square hole. The second pixel hole 22 is closer to the shaped edge than the first pixel hole 21 of the same row, and the area and shape of the second pixel hole 22 may be the same as those of the first pixel hole. Preferably, the area and shape of the second pixel hole 22 may be the same as the second pixel in the first embodiment, i.e. the plurality of second pixel holes 22 are shaped holes comprising a first edge which is an arc-shaped edge, wherein the arc-shaped edge is closest to the arc-shaped edge and is parallel to the shape of the arc-shaped edge. In this way, the arc-shaped edges of the second pixel holes 22 close to the arc-shaped edge are connected to form a substantially arc-shaped light exit boundary, and thus, compared with the edges of pixel holes having other shapes such as a straight line shape or a broken line shape, a jagged boundary is not generated in the display on the arc-shaped edge, and the display effect is improved.
Specifically, unlike the first embodiment, the pixel defining layer 34 forming the second pixel hole 22 has an inclined upper surface facing the arc-shaped edge. Therefore, the thickness of the pixel defining layer 34 along the direction towards the arc-shaped edge is gradually reduced, and the light reflecting layer 36 is arranged on the inclined upper surface of the pixel defining layer 24 at the position close to the arc-shaped edge, wherein the light reflecting layer 36 is made of a metal light reflecting material, so that the light outlet angle of the second pixel hole 22 at the arc-shaped edge is realized, the large-area light outlet of the special-shaped edge is realized, and the sawtooth-shaped display defects of the special-shaped edge are further inhibited.
Referring further to fig. 5, the pixel defining layer 34 is formed on the driving substrate 30, and the driving substrate 30 includes a carrier, a buffer, and a plurality of dielectric layers, wherein a plurality of thin film transistor units 31 are formed in the driving substrate 30 to be electrically connected to the circuit layer 32 on the driving substrate 30. The circuit layer 32 is patterned to electrically connect the plurality of micro LED chips 33, respectively, so as to realize that the plurality of thin film transistor units 31 drive the plurality of micro LED chips 33, respectively.
The pixel holes are filled with a sealant, and the first pixel hole 22 and the second pixel hole 21 are filled with the sealant, so as to seal 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 invention realizes the amplification of the pixel points at the corresponding positions by utilizing the larger second pixel holes at the special-shaped edge, thereby preventing the light emitting of the pixel points at the edge from being too concentrated and closer to a surface light source or a line light source rather than point light sources at other parts. When the pixel points of the special-shaped edge are area light sources or line light sources with large light-emitting areas and low brightness, the zigzag display boundary can be effectively reduced.
In another preferred embodiment, two micro LED chips may be disposed in the second pixel hole, so as to further prevent the luminance of the pixel close to the special-shaped edge from being too large as compared with the luminance of the adjacent pixel, thereby reducing jagged display and ensuring that the boundary display luminance is not too dark.
In addition, the distances among the plurality of micro LED chips are completely consistent, and the mass transfer of the plurality of micro LED chips can be realized by adopting one mass transfer template and adopting one step.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the 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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| Application Number | Priority Date | Filing Date | Title |
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| CN202211218706.6A CN115274976B (en) | 2022-10-07 | 2022-10-07 | Micro LED display structure and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211218706.6A CN115274976B (en) | 2022-10-07 | 2022-10-07 | Micro LED display structure and manufacturing method thereof |
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| CN115274976A CN115274976A (en) | 2022-11-01 |
| CN115274976B true CN115274976B (en) | 2022-12-30 |
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| CN215599981U (en) * | 2021-09-03 | 2022-01-21 | 重庆康佳光电技术研究院有限公司 | Display panel and display device |
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| CN106340249A (en) * | 2016-10-18 | 2017-01-18 | 昆山龙腾光电有限公司 | Specially-shaped display panel and pixel structure thereof |
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