Display device having liquid crystal compensation layer

Patent metadata

Field	Value
Publication number	US-12372832-B2
Application number	US-202217755534-A
Country	US
Kind code	B2
Filing date	Mar 15, 2022
Priority date	Mar 7, 2022
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

A display device is provided. In the present application, a liquid crystal compensation layer is provided on both first polarizer and second polarizer, and an improvement of compensation value is not realized by stretching the liquid crystal compensation layer but by adjusting the refractive index difference and thickness of the liquid crystal molecules, so the adjustment range is large, the restriction is small, and it can be matched with the high phase difference of the liquid crystal display panel. Therefore, the dark state side-view light leakage of the liquid crystal display panel and the contrast ratio of the liquid crystal display panel are improved, and the image quality is enhanced.

First claim

What is claimed is:

1. A display device, comprising:
a first polarizer;
a second polarizer, wherein the first polarizer is arranged opposite to the second polarizer; and
a liquid crystal display panel arranged between the first polarizer and the second polarizer;
wherein the first polarizer comprises a first liquid crystal compensation layer, and the second polarizer comprises a second liquid crystal compensation layer;
wherein the first polarizer further comprises a first polarizing layer, and the first liquid crystal compensation layer is positioned between the first polarizing layer and the liquid crystal display panel;
wherein the first polarizer further comprises an optical compensation layer positioned between the first polarizing layer and the liquid crystal display panel;
wherein the first liquid crystal compensation layer comprises a liquid crystal polymer, and is configured to compensate for a birefringence of liquid crystal molecules in the liquid crystal display panel based on a birefringence difference of liquid crystal molecules in the liquid crystal polymer and a thickness of the liquid crystal polymer; and
wherein the optical compensation layer comprises a single optical axis compensation film or a dual optical axis compensation film, and is configured to symmetrically compensate for the birefringence of the liquid crystal molecules in the liquid crystal display panel by correcting a phase difference generated by the liquid crystal molecules in the liquid crystal display panel at different viewing angles.

2. The display device of claim 1 , wherein the second polarizer further comprises:
a second polarizing layer, wherein the second liquid crystal compensation layer is positioned between the second polarizing layer and the liquid crystal display panel.

3. The display device of claim 2 , wherein the second polarizer further comprises:
a second support layer positioned between the second polarizing layer and the second liquid crystal compensation layer.

4. The display device of claim 1 , wherein the optical compensation layer is positioned between the first polarizing layer and the first liquid crystal compensation layer.

5. The display device of claim 4 , wherein the first polarizer further comprises:
a first support layer positioned between the first liquid crystal compensation layer and the liquid crystal display panel to protect and support the first liquid crystal compensation layer and prevent the first liquid crystal compensation layer from shrinking, the first support layer comprising a triacetate cellulose film.

6. The display device of claim 1 , wherein the first liquid crystal compensation layer is positioned between the first polarizing layer and the optical compensation layer.

7. The display device of claim 6 , wherein the first polarizer further comprises:
a first support layer positioned between the first polarizing layer and the first liquid crystal compensation layer.

8. A display device, comprising:
a first polarizer;
a second polarizer, wherein the first polarizer is arranged opposite to the second polarizer; and
a liquid crystal display panel arranged between the first polarizer and the second polarizer;
wherein the first polarizer comprises a first liquid crystal compensation layer, and the second polarizer comprises a second liquid crystal compensation layer;
wherein the first polarizer is configured to be a light incident side, and the second polarizer is configured to be a light-emitting side;
wherein the first polarizer further comprises a first polarizing layer, and the first liquid crystal compensation layer is positioned between the first polarizing layer and the liquid crystal display panel;
wherein the first polarizer further comprises an optical compensation layer positioned between the first polarizing layer and the liquid crystal display panel;
wherein the first liquid crystal compensation layer comprises a liquid crystal polymer, and is configured to compensate for a birefringence of liquid crystal molecules in the liquid crystal display panel based on a birefringence difference of liquid crystal molecules in the liquid crystal polymer and a thickness of the liquid crystal polymer; and
wherein the optical compensation layer comprises a single optical axis compensation film or a dual optical axis compensation film, and is configured to symmetrically compensate for the birefringence of the liquid crystal molecules in the liquid crystal display panel by correcting a phase difference generated by the liquid crystal molecules in the liquid crystal display panel at different viewing angles.

9. The display device of claim 8 , wherein the optical compensation layer is positioned between the first polarizing layer and the first liquid crystal compensation layer.

10. The display device of claim 9 , wherein the first polarizer further comprises:
a first support layer positioned between the first liquid crystal compensation layer and the liquid crystal display panel to protect and support the first liquid crystal compensation layer and prevent the first liquid crystal compensation layer from shrinking, the first support layer comprising a triacetate cellulose film.

11. The display device of claim 8 , wherein the first liquid crystal compensation layer is positioned between the first polarizing layer and the optical compensation layer.

12. The display device of claim 11 , wherein the first polarizer further comprises:
a first support layer positioned between the first polarizing layer and the first liquid crystal compensation layer.

Assignees

• Tcl China Star Optoelectronics Tech Co Ltd

Inventors

• Hai Bo

Classifications

• G02F1/133531

  characterised by the arrangement of polariser or analyser axes · CPC title

• G02F1/133633 Primary

  using mesogenic materials · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02F1/13363 Primary

  Birefringent elements, e.g. for optical compensation · CPC title