Display panel and display device

Patent metadata

Field	Value
Publication number	US-12158640-B2
Application number	US-202117620714-A
Country	US
Kind code	B2
Filing date	Nov 26, 2021
Priority date	Nov 18, 2021
Publication date	Dec 3, 2024
Grant date	Dec 3, 2024

Abstract

A display panel and a display device are disclosed. The display panel includes a display liquid crystal cell, a first polarizer, a switchable liquid crystal cell, and a second polarizer. A first substrate and a second substrate of the switchable liquid crystal cell are formed of transparent flexible substrates which are substituted for glass substrates, and a first phase compensation film group including at least a first C-type compensation film group is provided, which is used to compensate the phase difference caused by the phase retardation when the polarized light passes through the transparent flexible substrates, thereby reducing the thickness and weight of the display panel.

First claim

What is claimed is:

1. A display panel, comprising:
a display liquid crystal cell;
a first polarizer, disposed on one side of the display liquid crystal cell;
a second polarizer, disposed between the first polarizer and the display liquid crystal cell;
a switchable liquid crystal cell, disposed between the first polarizer and the second polarizer and comprising:
a first substrate, disposed between the first polarizer and the second polarizer;
a second substrate, disposed opposite the first substrate and disposed between the first substrate and the second polarizer;
a switchable liquid crystal layer, disposed between the first substrate and the second substrate and comprising a polymer network and a plurality of switchable liquid crystal molecules distributed in the polymer network; and
a first phase compensation film group, disposed between the first polarizer and the second polarizer, wherein the first phase compensation film group at least comprises a first C-type compensation film group, and the first C-type compensation film group comprises a first C-type compensation film disposed between one of the first substrate and the second substrate and the switchable liquid crystal layer; and

a third polarizer, disposed on one side of the display liquid crystal cell facing away from the second polarizer,
wherein the first substrate and the second substrate are transparent flexible substrates, and a sum of a phase retardation of the first C-type compensation film group in a film thickness direction and phase retardations of the first substrate and the second substrate in the film thickness direction ranges from −30 nm to 30 nm.

2. The display panel according to claim 1 , wherein the first C-type compensation film group further comprises a second C-type compensation film disposed between the other one of the first substrate and the second substrate and the switchable liquid crystal layer;
wherein a sum of a phase retardation of the first C-type compensation film in the film thickness direction and the phase retardation of the one of the first substrate and the second substrate in the film thickness direction ranges from −30 nm to 30 nm, and a sum of a phase retardation of the second C-type compensation film in the film thickness direction and the phase retardation of the other one of the first substrate and the second substrate in the film thickness direction ranges from −30 nm to 30 nm.

3. The display panel according to claim 1 , wherein a thickness of the first C-type compensation film group ranges from 1 micron to 10 microns.

4. The display panel according to claim 1 , wherein materials of the first substrate and the second substrate include any one or more combinations of transparent polyimide, polyethylene terephthalate, polyethylene naphthalate, and cycloolefin polymers.

5. The display panel according to claim 1 , wherein a thickness of the first substrate and the second substrate ranges from 10 microns to 30 microns.

6. The display panel according to claim 1 , wherein the first phase compensation film group further comprises an A-type compensation film group located on one side of the first C-type compensation film group away from the first polarizer.

7. The display panel according to claim 1 , wherein the display liquid crystal cell comprises:
a third substrate;
a fourth substrate, disposed opposite the third substrate and disposed on one side of the third substrate facing away from the first polarizer;
a display liquid crystal layer, disposed between the third substrate and the fourth substrate and comprising a plurality of display liquid crystal molecules; and
a second phase compensation film group, disposed between the second polarizer and the third polarizer, wherein the second phase compensation film group at least comprises a second C-type compensation film group; and
wherein the third substrate and the fourth substrate are transparent flexible substrates, and a sum of a phase retardation of the second C-type compensation film group in the film thickness direction and phase retardations of the third substrate and the fourth substrate in the film thickness direction ranges from −30 nm to 30 nm.

8. The display panel according to claim 1 , wherein the sum of the phase retardation of the first C-type compensation film group in the film thickness direction and the phase retardations of the first substrate and the second substrate in the film thickness direction is zero.

9. A display panel, comprising:
a display liquid crystal cell;
a first polarizer, disposed on one side of the display liquid crystal cell;
a second polarizer, disposed between the first polarizer and the display liquid crystal cell;
a switchable liquid crystal cell, disposed between the first polarizer and the second polarizer and comprising:
a first substrate, disposed between the first polarizer and the second polarizer;
a second substrate, disposed opposite the first substrate and disposed between the first substrate and the second polarizer;
a switchable liquid crystal layer, disposed between the first substrate and the second substrate and comprising a polymer network and a plurality of switchable liquid crystal molecules distributed in the polymer network; and
a first phase compensation film group, disposed between the first polarizer and the second polarizer, wherein the first phase compensation film group at least comprises a first C-type compensation film group, and the first C-type compensation film group comprises a first C-type compensation film disposed between one of the first substrate and the second substrate and the switchable liquid crystal layer; and

wherein the first substrate and the second substrate are transparent flexible substrates, and a sum of a phase retardation of the first C-type compensation film group in a film thickness direction and phase retardations of the first substrate and the second substrate in the film thickness direction ranges from −30 nm to 30 nm.

10. The display panel according to claim 9 , wherein the first C-type compensation film group further comprises a second C-type compensation film disposed between the other one of the first substrate and the second substrate and the switchable liquid crystal layer;
wherein a sum of a phase retardation of the first C-type compensation film in the film thickness direction and the phase retardation of the one of the first substrate and the second substrate in the film thickness direction ranges from −30 nm to 30 nm, and a sum of a phase retardation of the second C-type compensation film in the film thickness direction and the phase retardation of the other one of the first substrate and the second substrate in the film thickness direction ranges from −30 nm to 30 nm.

11. The display panel according to claim 9 , wherein a thickness of the first C-type compensation film group ranges from 1 micron to 10 microns.

12. The display panel according to claim 9 , wherein materials of the first substrate and the second substrate include any one or more combinations of transparent polyimide, polyethylene terephthalate, polyethylene naphthalate, and cycloolefin polymers.

13. The display panel according to claim 9 , wherein a thickness of the first substrate and the second substrate ranges from 10 microns to 30 microns.

14. The display panel according to claim 9 , wherein the first phase compensation film group further comprises an A-type compensation film group located on one side of the first C-type compensation film group away from the first polarizer.

15. The display panel according to claim 9 , wherein the display liquid crystal cell comprises:

Assignees

• Wuhan China Star Optoelectronics Technology Co Ltd

Inventors

• He Rui
• Ye Wenlong
• Mei Xindong
• Cheng Wei

Classifications

• G02F1/13363

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

• G02F1/133528

  Polarisers · CPC title

• G02F1/13345

  Network or three-dimensional gels · CPC title

• G02F1/133634

  the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis · CPC title

• G02F1/13471

  in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells (G02F1/13475 takes precedence) · CPC title