Backlight and method for manufacturing the same, display apparatus

Patent metadata

Field	Value
Publication number	US-10782000-B2
Application number	US-201916238671-A
Country	US
Kind code	B2
Filing date	Jan 3, 2019
Priority date	May 8, 2018
Publication date	Sep 22, 2020
Grant date	Sep 22, 2020

Abstract

The present application provides a backlight, a method for manufacturing a backlight, and a display apparatus. The backlight includes at least one lamp plate having a base substrate and a light source on the base substrate, the light source being configured to emit light having a first wavelength; a wavelength selection layer on a side of the light source away from the base substrate; and a wavelength conversion layer on a side of the wavelength selection layer away from the base substrate. The wavelength conversion layer is configured to emit light having a second wavelength under excitation of the light having the first wavelength. The wavelength selection layer is configured to transmit the light having the first wavelength through the wavelength selection layer and reflect the light having the second wavelength.

First claim

What is claimed is:

1. A backlight, comprising:
a lamp plate having a base substrate and a light source on the base substrate, the light source being configured to emit light having a first wavelength;
a wavelength selection layer on a side of the light source away from the base substrate;
a wavelength conversion layer on a side of the wavelength selection layer away from the base substrate;
a first prism layer on a side of the wavelength conversion layer away from the base substrate and configured to collimate light entering the first prism layer;
a diffuser layer on a side of the light source away from the base substrate and a side of the wavelength selection layer closer to the base substrate, and configured to diffuse light having a predetermined color emitted from the light source; and
a second prism layer on a side of the diffuser layer away from the base substrate and the side of the wavelength selection layer closer to the base substrate, and configured to collimate the light having the predetermined color passing through the diffuser layer,
wherein
an extending direction of a ridge of the first prism layer is orthogonal to an extending direction of a ridge of the second prism layer;
the wavelength conversion layer is configured to emit light having a second wavelength under excitation of the light having the first wavelength, and
the wavelength selection layer is configured to transmit the light having the first wavelength through the wavelength selection layer and reflect the light having the second wavelength.

2. The backlight of claim 1 , wherein the lamp plate further comprises a reflective layer on the base substrate,
wherein the reflective layer has an opening in a one-to-one correspondence with the light source, and the reflective layer is nested on a layer where the light source is located through the opening of the reflective layer.

3. The backlight of claim 2 , wherein an orthographic projection of the light source on the base substrate overlaps an orthographic projection of the opening on the base substrate.

4. The backlight of claim 1 , further comprising a plurality of lamp plates including the lamp plate, and each of the plurality of lamp plates is the same as the lamp plate, the plurality of lamp plates are arranged in a plane and are arranged in form of an array;
wherein an orthographic projection of the wavelength selection layer on the plane covers an orthographic projection of the plurality of lamp plates on the plane and an orthographic projection of a gap between adjacent lamp plates of the plurality of lamp plates on the plane.

5. The backlight of claim 4 , wherein an orthographic projection of each of the wavelength conversion layer and the first prism layer on the plane covers the orthographic projection of the plurality of lamp plates on the plane and the orthographic projection of the gap between adjacent lamp plates of the plurality of lamp plates on the plane.

6. The backlight of claim 1 , wherein the wavelength conversion layer is directly on and in contact with the wavelength selection layer.

7. The backlight of claim 1 , wherein the light having the first wavelength comprises blue light; and the light having the second wavelength comprises red light and green light.

8. The backlight of claim 1 , wherein the first wavelength is in a range of approximately 320 nm to approximately 480 nm; and the second wavelength is in a range of approximately 480 nm to approximately 800 nm.

9. The backlight of claim 1 , wherein the wavelength conversion layer comprises a quantum dot or a fluorophor.

10. The backlight of claim 1 , wherein the light source is a mini light emitting diode, and the light having the first wavelength is blue light.

11. A display apparatus, comprising the backlight of claim 1 .

12. The backlight of claim 1 , wherein the light having the first wavelength comprises blue light; and the light having the second wavelength comprises red light or green light.

13. A method for manufacturing a backlight, comprising:
forming a base substrate and forming a light source on the base substrate, thereby forming a lamp plate, the light source being formed to emit light having a first wavelength;
forming a wavelength selection layer on a side of the light source away from the base substrate;
forming a wavelength conversion layer on a side of the wavelength selection layer away from the base substrate;
forming a first prism layer on a side of the wavelength conversion layer away from the base substrate, the first prism layer being configured to collimate light entering the first prism layer;
forming a diffuser layer on a side of the light source away from the base substrate and a side of the wavelength selection layer closer to the base substrate, and the diffuser layer being configured to diffuse light having a predetermined color emitted from the light source; and
forming a second prism layer on a side of the diffuser layer away from the base substrate and the side of the wavelength selection layer closer to the base substrate, and the second prism layer being configured to collimate the light having the predetermined color passing through the diffuser layer,
wherein
the first prism layer and the second prism layer are formed so that an extending direction of a ridge of the first prism layer is orthogonal to an extending direction of a ridge of the second prism layer;
the wavelength conversion layer is formed to emit light having a second wavelength under excitation of the light having the first wavelength, and
the wavelength selection layer is formed to transmit the light having the first wavelength through the wavelength selection layer and reflect the light having the second wavelength.

14. The method of claim 13 , wherein the wavelength conversion layer is directly formed on the wavelength selection layer and formed to be in contact with the wavelength selection layer.

15. The method of claim 13 , wherein the first wavelength is in a range of approximately 320 nm to approximately 480 nm; and the second wavelength is in a range of approximately 480 nm to approximately 800 nm.

16. The method of claim 13 , wherein the wavelength conversion layer is formed to include a quantum dot or a fluorophor.

17. The method of claim 13 , further comprising:
forming a plurality of lamp plates including the lamp plate, each of the plurality of lamp plates being formed the same as the lamp plate, the plurality of lamp plates being formed in a plane and being formed in form of an array;
wherein the wavelength selection layer is formed so that an orthographic projection of the wavelength selection layer on the plane covers an orthographic projection of the plurality of lamp plates on the plane and an orthographic projection of a gap between adjacent lamp plates of the plurality of lamp plates on the plane.

Assignees

• Beijing Boe Optoelectronics Tech Co Ltd
• Boe Technology Group Co Ltd

Inventors

• Zhang Shubai
• Sun Haiwei
• Zhai Ming
• Hao Yutao
• Lu Yuanda
• Wang Zhen

Classifications

• G02F1/133614

  using photoluminescence, e.g. phosphors illuminated by UV or blue light · CPC title

• G02F1/133607

  the light controlling member including light directing or refracting elements, e.g. prisms or lenses · CPC title

• G02F1/133606

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

• G02F1/133605

  including specially adapted reflectors · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title