Display device

Patent metadata

Field	Value
Publication number	US-12235544-B2
Application number	US-202117620671-A
Country	US
Kind code	B2
Filing date	Dec 9, 2021
Priority date	Nov 25, 2021
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

The present application provides a display device. The display device comprises a quantum dot composite film, a liquid crystal display panel and a backlight module. The quantum dot composite film comprises a quantum dot film layer, and a light emerging surface of the quantum dot film layer is provided with a plurality of first prism structures. The first prism structure is employed to reduce an angle at which light emerges from the quantum dot film layer, thereby improving the front view brightness of the display device, and improving or avoiding the problem of light leakage of the display device in the large viewing angle of the dark state.

First claim

What is claimed is:

1. A display device, comprising:
a backlight module;
a liquid crystal display panel arranged on a light emerging side of the backlight module; and
a quantum dot composite film arranged between the liquid crystal display panel and the backlight module, wherein the quantum dot composite film comprises:
a quantum dot film layer; and
a plurality of first prism structures arranged on a light emerging surface of the quantum dot film layer;
wherein a material of each of the plurality of first prism structures comprises transparent polymer and inorganic particles;
wherein the quantum dot composite film further comprises a first optical film layer disposed on a side of the plurality of first prism structures away from the quantum dot film layer;
wherein a surface of the first optical film layer away from the quantum dot film layer comprises a plurality of second prism structures;
wherein a cross section of each of the plurality of second prism structures is a triangle or a trapezoid;
wherein each of the plurality of second prism structures comprises a plurality of first sub-prism structures and a plurality of second sub-prism structures, and at least one of the plurality of second sub-prism structure is interspersedly arranged between the plurality of first sub-prism structures or arranged on a side of the plurality of first sub-prism structures; and
wherein a bottom angle of each of the plurality of first sub-prism structures is different from a bottom angle of each of the plurality of second sub-prism structures; and/or a cross section of each of the plurality of first sub-prism structures is different from a cross section of each of the plurality of second sub-prism structures.

2. The display device according to claim 1 , wherein a cross section of each of the plurality of first prism structures is a triangle or a trapezoid.

3. The display device according to claim 1 , wherein the plurality of first prism structures are distributed continuously or distributed at intervals along a first direction on the light emerging surface of the quantum dot film layer.

4. The display device according to claim 3 , wherein the quantum dot composite film further comprises a reflective polarizer, and the reflective polarizer is disposed on a side of the plurality of first prism structures away from the quantum dot film layer.

5. The display device according to claim 1 , wherein the plurality of second prism structures are distributed continuously or distributed at intervals along a second direction on a side of the first optical film layer away from the quantum dot film layer, and the first direction is parallel to or intersects with the second direction.

6. The display device according to claim 5 , wherein a distance between adjacent ones of the plurality of second prism structures is greater than 0 μm, and less than or equal to 100 μm.

7. The display device according to claim 1 , wherein a bottom angle of each of the plurality of second prism structures is the same, and the bottom angle of each of the plurality of second prism structures is greater than or equal to 20°, and less than or equal to 80°.

8. The display device according to claim 1 , wherein the bottom angle of each of the plurality of first sub-prism structures is greater than the bottom angle of each of the plurality of second sub-prism structures.

9. The display device according to claim 8 , wherein the bottom angle of each of the plurality of first sub-prism structures is greater than 45°, and less than or equal to 80°, and the bottom angle of each of the plurality of second sub-prism structures is greater than or equal to 10°, and less than or equal to 45°.

10. The display device according to claim 1 , wherein the reflective polarizer is arranged on a side of the first optical film layer away from the quantum dot film layer.

11. The display device according to claim 1 , wherein the transparent polymer comprises at least one of polymethyl methacrylate, polycarbonate, polyester resin or epoxy resin, and the inorganic particles comprise at least one of TiO2, BaSO4 and Zr02.

12. The display device according to claim 1 , wherein a refractive index of each of the plurality of first prism structures is greater than or equal to 1.3, and less than or equal to 1.7.

13. The display device according to claim 1 , wherein the quantum dot film layer comprises a composite film substrate and a plurality of quantum dots distributed in the composite film substrate;
wherein a material of the composite film substrate comprises transparent polymer.

14. The display device according to claim 13 , wherein a material of the transparent polymer comprises at least one of polymethyl methacrylate, polycarbonate, polyester resin or epoxy resin, and each of the plurality of quantum dots comprises a luminescent core and an inorganic protective shell layer encapsulating the luminescent core;
wherein a material of the inorganic protective shell layer comprises at least one of CdS, ZnSe, ZnCdS2, ZnS and ZnO.

15. The display device according to claim 14 , wherein the plurality of quantum dots comprise red light quantum dots and green light quantum dots;
wherein a material of the luminescent core of each of the red light quantum dots comprises at least one of CdSe, Cd2SeTe and InAs, and a material of the luminescent core of each of the green light quantum dots comprises at least one of ZnCdSe2, InP and Cd2SSe.

16. The display device according to claim 1 , wherein the quantum dot composite film is attached to a side of the liquid crystal display panel facing the backlight module; or the quantum dot composite film is attached to a side of the backlight module facing the liquid crystal display panel.

17. A display device, comprising:
a backlight module;
a liquid crystal display panel arranged on a light emerging side of the backlight module; and
a quantum dot composite film arranged between the liquid crystal display panel and the backlight module, wherein the quantum dot composite film comprises:
a quantum dot film layer; and
a plurality of first prism structures arranged on a light emerging surface of the quantum dot film layer;
wherein the plurality of first prism structures are distributed continuously or distributed at intervals along a first direction on the light emerging surface of the quantum dot film layer;
wherein the quantum dot composite film further comprises a reflective polarizer, and the reflective polarizer is disposed on a side of the plurality of first prism structures away from the quantum dot film layer;
wherein the quantum dot composite film further comprises a first optical film layer disposed on a side of the plurality of first prism structures away from the quantum dot film layer;
wherein a surface of the first optical film layer away from the quantum dot film layer comprises a plurality of second prism structures;
wherein a cross section of each of the plurality of second prism structures is a triangle or a trapezoid;
wherein the plurality of second prism structures comprise a plurality of first sub-prism structures and a plurality of second sub-prism structures, and at least one of the plurality of second sub-prism structure is interspersedly arranged between the plurality of first sub-prism structures or arranged on a side of the plurality of first sub-prism structures;

wherein a bottom angle of each of the plurality of first sub-prism structures is different from a bottom angle of each of the plurality of second sub-prism structures; and/or a cross section of each of the plurality of first s

Assignees

• Shenzhen China Star Optoelectronics Semiconductor Display Tech Co Ltd

Inventors

• Sun Chengxiao
• Zhou Miao
• Chen Lixuan
• Chen Zhenxia
• Lan Song

Classifications

• G02F1/133609

  including means for improving the color mixing, e.g. white · CPC title

• G02F1/133607

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

• G02F1/133614 Primary

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

• G02B5/045 Primary

  Prism arrays · CPC title

• G02F2202/28

  Adhesive materials or arrangements · CPC title