Backlight module and quantum dot display device

Patent metadata

Field	Value
Publication number	US-12019329-B2
Application number	US-202117295466-A
Country	US
Kind code	B2
Filing date	Apr 30, 2021
Priority date	Apr 22, 2021
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

The present application provides a backlight module and a quantum dot display device. The present application improves energy efficiency by modifying a backlight of the quantum dot display device. Specifically, energy efficiency of a light-emitting element is improved by adding a small amount of phosphors in the backlight module or setting a diffuser plate as a transparent diffuser plate. In addition, the quantum dot display device provided by the present application not only has a backlight device, but also has a quantum dot film layer and a polarizer.

First claim

What is claimed is:

1. A backlight module, comprising:
a light-emitting element which emits blue light;
a color conversion layer comprising a phosphor, wherein the phosphor emits at least one of red light, green light, or yellow light under excitation of the blue light;
a diffuser plate located on a side of a light-exiting surface of the light-emitting element; and
a plurality of protrusions located on a side of the diffuser plate away from the light-emitting element:,
wherein the color conversion layer is formed on a surface of the diffuser plate and is located on a side of the diffuser plate away from the light-emitting element, and the plurality of protrusions are formed on a surface of the color conversion layer away from the diffuser plate.

2. The backlight module according to claim 1 , wherein a weight percentage of the phosphor in the color conversion layer is 0.05 wt % to 0.5 wt %.

3. The backlight module according to claim 1 , wherein the phosphor is made of a material comprising a rare earth phosphor or a calcium halophosphate phosphor activated by antimony and manganese.

4. The backlight module according to claim 1 , wherein the diffuser plate is a transparent diffuser plate with a transmittance greater than 90%.

5. A quantum dot display device, comprising:
a backlight module, comprising:
a light-emitting element which emits blue light;
a color conversion layer comprising a phosphor, wherein the phosphor emits at least one of red light, green light, or yellow light under excitation of the blue light;
a diffuser plate located on a side of a light-exiting surface of the light-emitting element; and
a plurality of protrusions located on a side of the diffuser plate away from the light-emitting element; and
a display panel located on a side of a light-exiting surface of the backlight module, wherein the display panel comprises a quantum dot layer;
wherein the color conversion layer is formed on a surface of the diffuser plate and is located on a side of the diffuser plate away from the light-emitting element, and the plurality of protrusions are formed on a surface of the color conversion layer away from the diffuser plate.

6. The quantum dot display device according to claim 5 , wherein the display panel further comprises a polarizer, and the quantum dot layer is formed on the polarizer.

7. The quantum dot display device according to claim 5 , wherein a weight percentage of the phosphor in the color conversion layer is 0.05 wt % to 0.5 wt %.

8. The quantum dot display device according to claim 5 , wherein the phosphor is made of a material comprising a rare earth phosphor or a calcium halophosphate phosphor activated by antimony and manganese.

9. The quantum dot display device according to claim 5 , wherein the diffuser plate is a transparent diffuser plate with a transmittance greater than 90%.

10. A backlight module, comprising:
a light-emitting element which emits blue light; and
a color conversion layer comprising a phosphor, wherein the phosphor emits at least one of red light, green light, or yellow light under excitation of the blue light;
a substrate, wherein the light-emitting element is formed on the substrate; and
a reflective sheet located on an upper surface of the substrate and adjacent to the light-emitting element;
wherein the color conversion layer is located on a surface of the reflective sheet away from the substrate.

Assignees

• Shenzhen China Star Optoelectronics Semiconductor Display Tech Co Ltd

Inventors

• Bai Xue
• Lan Song
• Zhou Miao
• Li Dongze

Classifications

• H10W90/00

  Package configurations · CPC title

• H10H20/851

  Wavelength conversion means · CPC title

• H10H20/85

  Packages · CPC title

• G02F1/133606 Primary

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

• G02F1/133605

  including specially adapted reflectors · CPC title