CN213124478U

CN213124478U - Miniature light-emitting diode display back plate and display screen

Info

Publication number: CN213124478U
Application number: CN202022282192.3U
Authority: CN
Inventors: 翟峰; 蒋光平; 萧俊龙
Original assignee: Chongqing Kangjia Photoelectric Technology Research Institute Co Ltd
Current assignee: Chongqing Kangjia Photoelectric Technology Research Institute Co Ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-05-04
Anticipated expiration: 2030-10-14

Abstract

The utility model relates to a micro light-emitting diode display back plate and a display screen, which comprises a substrate, wherein a plurality of pixel groups arranged in a matrix are arranged on the substrate, and each pixel group comprises a plurality of LED chips; the substrate is divided into a first area and a second area surrounding the first area; the plurality of LED chips of the pixel group in the first region are all provided with sapphire substrates; a first LED chip of the plurality of LED chips of the pixel group within the second region is not provided with a sapphire substrate; the first LED chip is the LED chip which is farthest away from one side of the substrate in the plurality of LED chips; the problem of color cast caused by lack of combination of three primary colors when a user observes the edge of the display unit plate at an upward or downward angle is effectively solved.

Description

Miniature light-emitting diode display back plate and display screen

Technical Field

The utility model relates to a show technical field, especially relate to a miniature emitting diode shows backplate and display screen.

Background

The display of a micro light emitting diode (mini LED) is based on an inorganic semiconductor LED, the distance between lamp beads is a novel display technology between 0.6 mm and 1.2mm, and the mini LED can be applied to ultra-large screen high-definition display, such as professional fields of monitoring and commanding, high-definition broadcasting, high-end cinemas, medical detection and the like or commercial fields of outdoor advertisements, conference exhibition, office display and the like. Because the mini LED adopts inorganic semiconductor materials, the brightness can reach 5000nit, which is 10 times of that of an Organic Light-Emitting Diode (OLED), and the mini LED can be seen in full color with strong Light outdoors; the photoelectric response can reach nanosecond level, is thousands of times faster than OLED and millions of times faster than liquid crystal display; the service life is over 10 years; transparent flexible displays may also be implemented. Generally, a large-size display screen after a display unit plate is laminated and seamlessly spliced is cut to form a spliced seam, but when the spliced seam is observed by human eyes at a certain upward or downward angle, the problem of line defect (line defect) of the spliced edge occurs due to lack of combination of three primary colors. For example, in the case of a bottom-up viewing angle, when the human eye observes the edge of the display unit panel, the mixed color of the green sub-pixel and the blue sub-pixel is observed, and at the moment, the color mixture is transmitted into the human eye to display the color of bluish-violet; similarly, in the case of a depression, when the human eye observes the edge of the display unit plate, the mixed color of the red sub-pixel and the green sub-pixel is observed, and at the moment, the color mixture is transmitted to the human eye to display yellow.

Therefore, how to improve the problem that the color shift caused by the lack of the combination of three primary colors when the user views the edge of the display unit plate from the upward or downward view is an urgent need to be solved.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned deficiencies of the related art, the present invention provides a micro led display back plate and a display screen, which is intended to improve the problem of color shift caused by lack of combination of three primary colors when the user views the edge of the display unit plate at an upward or downward angle.

The utility model also provides a miniature emitting diode shows backplate, include:

the LED display panel comprises a substrate, wherein a plurality of pixel groups arranged in a matrix manner are arranged on the substrate, and each pixel group comprises a plurality of LED chips; the substrate is divided into a first area and a second area surrounding the first area; the plurality of LED chips of the pixel group in the first region are all provided with sapphire substrates; a first LED chip of the plurality of LED chips of the pixel group within the second region is not provided with a sapphire substrate; the first LED chip is the LED chip which is farthest away from one side of the substrate in the plurality of LED chips.

In the micro light-emitting diode display back plate, the substrate is divided into a first area and a second area, and the second area surrounds the first area. That is, the second region is a region on the substrate near the side of the substrate, and may also be referred to as an edge region. And one LED chip which is farthest away from one side of the substrate in the plurality of LED chips of the pixel group in the second area is not provided with the sapphire substrate, so that the LED chip is exposed to the extension, the actual emergent light divergence angle of the LED is equal to the original LED divergence angle, the emergent light divergence angle of the LED deviating from the side edge of the substrate in the edge area of the substrate is enlarged, and the problem of color cast caused by lack of combination of three primary colors when a user observes the edge of the display unit plate at an upward viewing angle or a downward viewing angle is effectively solved.

Optionally, each of the pixel groups includes three LED chips having different colors from each other.

Optionally, any one of the three LED chips is a blue LED chip, a green LED chip, or a red LED chip.

Optionally, the rest of the three LED chips of the pixel group in the second region are not provided with a sapphire substrate; wherein the rest of the LED chips are two LED chips except the first LED chip in the plurality of LED chips.

Optionally, a second LED chip of the three LED chips of the pixel group in the second region is not provided with a sapphire substrate; wherein the second LED chip is the one of the three LED chips which is located at the middle position.

Optionally, the distance between two adjacent LED chips on the substrate is the same.

Optionally, a protective adhesive for covering the pixel group is disposed on the substrate.

Optionally, the protective glue is made of a black shading material.

Optionally, the substrate is a printed circuit substrate or a thin film liquid crystal substrate.

Based on same design, the utility model also provides a miniature LED display screen, including at least two as above miniature LED show the backplate, at least two the concatenation edge of the base plate of miniature LED show the backplate splice each other.

According to the micro light-emitting diode display screen, the splicing seam exists between the edges of two adjacent micro light-emitting diode display back plates, and because the sapphire substrate is not arranged on the LED chip which is farthest away from one side of the substrate in the plurality of LED chips of the pixel group in the second area of the substrate in the single micro light-emitting diode display back plate, the LED chip is exposed to the extension of the LED chip, the actual emergent light divergence angle of the LED is equal to the original LED divergence angle, so that the emergent light divergence angle of the LED deviating from the side edge of the substrate in the edge area of the substrate is enlarged, and the problem of color deviation caused by lack of combination of three primary colors when a user observes the splicing seam in the micro light-emitting diode display screen at an upward or downward angle is effectively solved.

Drawings

Fig. 1 is a top view and a dotted line cross-sectional view of a micro led display backplane according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of an alternative micro led display backplane according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of an alternative micro led display backplane according to an embodiment of the present invention;

fig. 4 is a light angle diagram of edge pixels of two types of micro led display backplates according to an embodiment of the present invention;

fig. 5 is a diagram illustrating light distribution of edge pixels of two types of micro led display backplates according to an embodiment of the present invention;

fig. 6 is a top view and a dotted line cross-sectional view of a micro led display panel according to an embodiment of the present invention;

description of reference numerals:

100-a substrate; 200-pixel groups; 101-a first area; 102-a second region; 204-sapphire substrate; 10-micro light emitting diode display screen; 20-micro light emitting diode display backplane.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Based on this, the present application intends to provide a solution to the above technical problem, the details of which will be explained in the following embodiments.

The embodiment of the utility model provides a:

referring to fig. 1, fig. 1 is a top view of a micro light emitting diode display back plate according to an embodiment of the present invention, and a cross-sectional view of a dotted line in the top view. Specifically, the micro light emitting diode display backplane comprises: a substrate 100; a plurality of pixel groups 200 are arranged in a rectangular shape on the substrate 100. Each pixel group includes a plurality of LED chips. The substrate 100 may be divided into a first region 101 and a second region 102. The second region 102 surrounds the first region 101, that is, the first region 101 is a middle region of the substrate, and the second region 102 is an edge region of the substrate 100 near the upper/lower sides of the substrate 100. And the plurality of LED chips of the pixel group 200 in the first region 101 are each provided with a sapphire substrate 204; a first LED chip of the plurality of LEDs of the pixel group 200 within the second region 102 is not provided with a sapphire substrate; the first LED chip is the LED chip which is farthest away from one side of the substrate in the plurality of LED chips. If the sapphire substrate is not arranged on the LED chip, the LED chip can be exposed for epitaxy, and the actual emergent light divergence angle of the LED is equal to the original emission angle of the LED. By enlarging the emergent light divergence angle of the LED deviating from the side edge of the substrate in the edge region of the substrate, the problem of color cast caused by lack of combination of three primary colors when a user observes the edge of the display unit plate at an upward or downward angle can be effectively improved.

In the second region, the LED chip that is farthest from the one side of the substrate is not provided with a sapphire substrate. Specifically, the sapphire substrate 204 is removed by means of laser lift-off for the LED chip of each pixel group in the edge area of the substrate, which LED chip faces away from the upper/lower side of the substrate. For example, after the conventional solid crystal RGB three-color LED chip is formed, the sapphire substrate of the designated LED chip at the edge of the substrate is removed by a 266nm laser device to expose the LED chip for extension, and then a black glue film pressing and trimming are performed to obtain the display back plate.

In some embodiments, each of the pixel groups includes three LED chips different in color from each other. Any one of the three LED chips is a blue LED chip, a green LED chip and a red LED chip.

It is understood that the arrangement of the three LED chips in each pixel group may be any one of the following: blue light, green light and red light LED chips; blue light, red light and green light LED chips; red, blue, green LED chips; red, green, blue LED chips; green, red, blue LED chips; green light, blue light and red light LED chips. That is to say, the arrangement of the three LED chips in each pixel group can be specifically set according to the actual application scenario, and it is only necessary to satisfy that each pixel group is a combination of three primary lights.

In some embodiments, the remaining LED chips of the three LED chips of the pixel group within the second region are not provided with a sapphire substrate; wherein the rest of the LED chips are two LED chips except the first LED chip in the plurality of LED chips.

In some embodiments, a second LED chip of the three LED chips of the pixel group within the second region is not provided with a sapphire substrate; wherein the second LED chip is the one of the three LED chips which is located at the middle position.

It can be understood that, in order to better improve the color shift problem on the edge side of the display backplane, for each pixel group located in the edge area of the substrate, in addition to removing only the sapphire substrate of the LED chip in each pixel group that is away from the upper/lower edge side of the substrate, the sapphire substrates of the remaining LED chips in each pixel group may be removed together. As an example, referring to fig. 2, none of the three LED chips in the pixel group in the edge region of the substrate has a sapphire substrate. As another example, referring to fig. 3, the one of the three LED chips of the pixel group in the edge region of the substrate, which is located in the middle, is also free of the sapphire substrate. That is, the divergence angle of the emergent light of a proper number of LEDs in the pixel group in the edge region of the substrate can be enlarged according to the actual requirement, so as to meet the requirement that human eyes need to view the edge of the display back plate of the micro light-emitting diode at a larger upward viewing angle or a downward viewing angle.

In some embodiments, the distance between two adjacent LED chips on the substrate is consistent.

It is understood that the distance between any two adjacent LED chips on the substrate may be uniform or non-uniform. In this embodiment, in order to ensure the light-emitting uniformity of the micro light-emitting diode display back plate, the distance between two adjacent LED chips on the substrate is kept consistent.

In some embodiments, a protective adhesive covering the pixel group is disposed on the substrate. The protective glue is made of black shading materials.

It can be understood that the black glue is arranged on the substrate to protect the wrapped LED chip, so that the LED chip is not easy to collide and damp.

In some embodiments, the substrate is a printed wiring substrate or a thin film liquid crystal substrate.

It is understood that a certain type of substrate may be selected according to actual requirements, including but not limited to a printed circuit substrate (PCB substrate), a thin film liquid crystal substrate (TFT substrate), a Complementary Metal-Oxide-Semiconductor (CMOS) substrate.

To sum up, the embodiment of the utility model provides a miniature LED display backplate, its base plate divide into first region and second region, and the second region surrounds first region. That is, the second region is a region on the substrate near the side of the substrate, and may also be referred to as an edge region. And one LED chip which is farthest away from one side of the substrate in the plurality of LED chips of the pixel group in the second area is not provided with the sapphire substrate, so that the LED chip is exposed to the extension, the actual emergent light divergence angle of the LED is equal to the original LED divergence angle, the emergent light divergence angle of the LED deviating from the side edge of the substrate in the edge area of the substrate is enlarged, and the problem of color cast caused by lack of combination of three primary colors when a user observes the edge of the display unit plate at an upward viewing angle or a downward viewing angle is effectively solved.

The effect achieved by an alternative micro led display backplane is further illustrated with reference to fig. 4-5:

the original divergence angle of the mini LED is set to be theta, and the divergence angle of emergent light of the mini LED is set to be theta 1.

As shown in fig. 4(a), when a sapphire substrate (sapphire) is provided on each LED chip, since the refractive index of the sapphire substrate > the refractive index of the encapsulant (Molding encapsulant) > the refractive index of air, it is found that θ 1< θ, and the divergence angle of the emitted light of the mini LED is reduced. A light distribution pattern when the sapphire substrate is provided on the LED chip is shown in fig. 5 (b).

As shown in fig. 4(b), when no sapphire substrate is provided on each LED chip, θ 1 is θ, that is, the divergence angle of the emitted light from the mini LED is the original divergence angle of the mini LED. The light distribution pattern when the sapphire substrate is not provided on the LED chip is shown in fig. 5 (a).

Therefore, the angle irradiated by the mini LED after the sapphire substrate is removed from the novel mini LED display back plate provided by the embodiment is larger, so that the display back plate without color cast can be observed by human eyes within a larger visual angle range.

The utility model discloses another embodiment:

the existing mini LED display screen realizes the display effect by welding a mini LED on a substrate (such as a PCB substrate), and the arrangement of mini LED pixels is limited to the substrate structure, can be arranged in parallel and cannot be changed. Generally, a splicing seam exists in a large-size display screen which is formed by laminating and cutting a display unit plate and spliced seamlessly, but when human eyes observe the splicing seam at a certain upward or downward angle, a color cast phenomenon occurs due to lack of combination of three primary colors. Therefore, the embodiment of the utility model provides a miniature LED display screen, show the backplate including two piece at least miniature LED, at least two miniature LED show the concatenation edge of the base plate of backplate and splice each other. Wherein, miniature emitting diode shows backplate includes: the LED display panel comprises a substrate, wherein a plurality of pixel groups arranged in a matrix manner are arranged on the substrate, and each pixel group comprises a plurality of LED chips; the substrate is divided into a first area and a second area surrounding the first area; the plurality of LED chips of the pixel group in the first region are all provided with sapphire substrates; a first LED chip of the plurality of LED chips of the pixel group within the second region is not provided with a sapphire substrate; the first LED chip is the LED chip which is farthest away from one side of the substrate in the plurality of LED chips. As described above, the details are not repeated herein. As an example, referring to fig. 6, the micro led display panel 10 is formed by splicing 4 × 4 micro led display backplates 20. In each micro LED display backplane 20, three LED chips in a pixel group in the edge region of the substrate have no sapphire substrate.

It is to be understood that the application is not limited to the examples described above, and that modifications and variations are possible to those skilled in the art in light of the above teachings, and that all such modifications and variations are intended to be included within the scope of the appended claims.

Claims

1. A micro light emitting diode display backplane, comprising:

the LED display panel comprises a substrate, wherein a plurality of pixel groups arranged in a matrix manner are arranged on the substrate, and each pixel group comprises a plurality of LED chips;

the substrate is divided into a first area and a second area surrounding the first area; the plurality of LED chips of the pixel group in the first region are all provided with sapphire substrates; a first LED chip of the plurality of LED chips of the pixel group within the second region is not provided with a sapphire substrate; the first LED chip is the LED chip which is farthest away from one side of the substrate in the plurality of LED chips.

2. The miniature light emitting diode display backplane of claim 1, wherein each of said pixel groups comprises three LED chips of different colors from one another.

3. The miniature light emitting diode display backplane of claim 2, wherein any of said three LED chips is a blue LED chip, a green LED chip, a red LED chip.

4. The micro light emitting diode display backplane of claim 2, wherein the remaining LED chips of the three LED chips of the pixel group in the second region are not provided with a sapphire substrate; wherein the rest of the LED chips are two LED chips except the first LED chip in the plurality of LED chips.

5. The micro light emitting diode display backplane of claim 2, wherein a second LED chip of the three LED chips of the pixel group in the second region is not provided with a sapphire substrate; wherein the second LED chip is the one of the three LED chips which is located at the middle position.

6. The miniature light emitting diode display backplane according to any of claims 1-5, wherein the spacing between two adjacent LED chips on said substrate is uniform.

7. The miniature light emitting diode display backplane of claim 1, wherein a protective adhesive covering said pixel groups is disposed on said substrate.

8. The miniature light emitting diode display backplane of claim 7, wherein said protective paste is a black light blocking material.

9. The miniature light emitting diode display backplane of claim 1, wherein said substrate is a printed wiring substrate or a thin film liquid crystal substrate.

10. A micro light emitting diode display screen, comprising at least two micro light emitting diode display back plates according to any one of claims 1 to 9, wherein the edges of the substrates of at least two micro light emitting diode display back plates are spliced with each other.