Display apparatus

Patent metadata

Field	Value
Publication number	US-11822183-B2
Application number	US-202217656965-A
Country	US
Kind code	B2
Filing date	Mar 29, 2022
Priority date	Mar 25, 2020
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

A display apparatus, comprising: a plurality of light sources arranged into an array, angle selection sheets on the light emitting sides of the light sources, and reflective layers on the sides of the light sources away from the angle selection sheets. The angle selection sheets are used for reflecting light rays of a first incident angle range and transmitting light rays of a second incident angle range, wherein an incident angle value corresponding to the first incident angle range is smaller than an incident angle value corresponding to the second incident angle range. The reflective layers can conduct diffuse reflection on the light rays reflected by the angle selection sheets and the light rays re-enter the angle selection sheets, so that light rays of a second incident angle subjected to the diffuse reflection are transmitted while light rays of a first incident angle repeat the described reflection operation.

First claim

What is claimed is:

1. A display apparatus, comprising:
a display panel, configured to display an image;
a micro light emitting diode light board, used as a backlight source; wherein the panel is on a light emitting side of the micro light emitting diode light board; the micro light emitting diode light board comprises a circuit board, a plurality of micro light emitting diodes and a reflective layer; the circuit board is configured to provide a driving signal; the plurality of micro light emitting diodes is on the circuit board; and the reflective layer is on a surface of a side of the circuit board close to the micro light emitting diodes, the reflective layer comprises an opening for exposing one of the plurality of the micro light emitting diodes, and the reflective layer is configured to perform diffuse reflection on incident light rays;
an angle selection layer on the light emitting side of the micro light emitting diode light board, configured to reflect light rays with a first incident angle range and transmit light rays with a second incident angle range; wherein an incident angle value corresponding to the first incident angle range is smaller than an incident angle value corresponding to the second incident angle range; and the reflective layer and the angle selection layer are used for improving light emitting uniformity of the micro light emitting diode light board; and
a diffusion layer on a side of the angle selection layer away from the micro light emitting diode light board, or, between the angle selection layer and the micro light emitting diode light board;
wherein a reflectivity of the angle selection layer to the light rays with the first incident angle range is decreased with increase of an incident angle; and
the reflectivity of the angle selection layer to the light rays with the first incident angle range is 10% to 80%, and the reflectivity of the angle selection layer to the light rays with the second incident angle range is less than 10%.

2. The display apparatus according to claim 1 , wherein a vertical distance from the circuit board to the diffusion layer and a distance between every two adjacent micro light emitting diodes meet a following relationship:
0.15 ≤h/p< 0.67;
wherein h represents the vertical distance from the circuit board to the diffusion layer, and p represents a distance between every two adjacent micro light emitting diodes.

3. The display apparatus according to claim 1 , wherein the angle selection layer further comprises:
a plurality of film layers, disposed in a laminated mode, wherein every two adjacent film layers of the plurality of film layers have different refraction indexes;
wherein the refraction indexes and thicknesses of the plurality of film layers meet a condition of reflecting the light rays with the first incident angle range and transmitting the light rays with the second incident angle range.

4. The display apparatus according to claim 1 , wherein the first incident angle range is 0° to 70°, and the second incident angle range is greater than 70°.

5. The display apparatus according to claim 1 , wherein the micro light emitting diode light board further comprises:
a packaging layer on a surface of a side of the micro light emitting diode away from the circuit board.

6. The display apparatus according to claim 1 , further comprising:
the angle selection layer is attached to a surface of the diffusion layer.

7. The display apparatus according to claim 6 , further comprising:
a transparent substrate between the micro light emitting diode light board and the diffusion layer; wherein
the angle selection layer is attached to a surface of a side of the transparent substrate away from the micro light emitting diode light board.

8. The display apparatus according to claim 6 , further comprising:
a transparent support on the micro light emitting diode light board, configured to support the diffusion layer.

9. The display apparatus according to claim 3 , further comprising:
a base, wherein the plurality of film layers are disposed on the base.

Assignees

• Hisense Visual Tech Co Ltd

Inventors

• Li Fulin
• Qiao Mingsheng
• Zhang Nannan
• Li Jinlong
• Liu Weidong
• Zhai Yushuai

Classifications

• G02F1/133603 Primary

  with LEDs · CPC title

• G02F1/133605

  including specially adapted reflectors · CPC title

• G02F1/133606

  including a specially adapted diffusing, scattering or light controlling members · CPC title