Display panel and display device

Patent metadata

Field	Value
Publication number	US-12158651-B2
Application number	US-202118011076-A
Country	US
Kind code	B2
Filing date	Dec 15, 2021
Priority date	Dec 9, 2021
Publication date	Dec 3, 2024
Grant date	Dec 3, 2024

Abstract

The present application embodiment discloses a display panel and a display device. The display panel includes a first mode and a second mode. The viewing angle of the display panel in the first mode is smaller than the viewing angle of the display panel in the second mode; the dimming liquid crystal cell is overlapped with the viewing angle adjustment liquid crystal cell; in the second mode, the dimming liquid crystal cell is used to scatter the incoming light; the panel body is arranged on a light-emitting side of the viewing angle adjustment liquid crystal cell and the dimming liquid crystal cell.

First claim

What is claimed is:

1. A display panel comprising a first mode and a second mode, wherein a viewing angle of the display panel in the first mode is smaller than a viewing angle of the display panel in the second mode, the display panel comprising:
a viewing angle adjustment liquid crystal cell, wherein the viewing angle adjustment liquid crystal cell is configured to adjust a display viewing angle of the display panel, the viewing angle adjustment liquid crystal cell comprises a first liquid crystal layer, and the first liquid crystal layer comprises a polymer network and first liquid crystal molecules distributed in the polymer network;
a dimming liquid crystal cell, wherein the dimming liquid crystal cell and the viewing angle adjustment liquid crystal cell are overlapped, the dimming liquid crystal cell comprises a second liquid crystal layer, the second liquid crystal layer comprises a polymer and second liquid crystal molecules distributed in the polymer, and the dimming liquid crystal cell is configured to scatter incident light in the second mode; and
a panel body disposed on a light-emitting side of the viewing angle adjustment liquid crystal cell and the dimming liquid crystal cell,
wherein the display panel further comprises a first polarizer and a second polarizer, an optical axis direction of the first polarizer is parallel to an optical axis direction of the second polarizer, the first polarizer is arranged on the viewing angle adjustment liquid crystal cell, and the second polarizer is arranged on a side of the viewing angle adjustment liquid crystal cell away from the first polarizer;
wherein the second liquid crystal molecules comprise a first refractive index and a second refractive index, the first refractive index is a refractive index of the second liquid crystal molecules in a long axis direction, the second refractive index is a refractive index of the second liquid crystal molecules in a short axis direction, the first refractive index is greater than the second refractive index, and a refractive index of the polymer is equal to the second refractive index; and
wherein in the second mode, the long axis direction of the second liquid crystal molecules crosses a normal direction of the first polarizer.

2. The display panel according to claim 1 , wherein the long axis direction of the second liquid crystal molecules is parallel to the normal direction of the first polarizer in the first mode.

3. The display panel according to claim 1 , wherein the long axis direction of the second liquid crystal molecules is perpendicular to the normal direction of the first polarizer in the second mode.

4. The display panel according to claim 1 , wherein a difference between the first refractive index and the second refractive index is greater than or equal to 0.07, and the difference is less than or equal to 0.5.

5. The display panel according to claim 1 , wherein in the dimming liquid crystal cell, the polymer is a polymer network, the second liquid crystal molecules are negative liquid crystals, the polymer is arranged along a first direction, and the first direction is parallel to the normal direction of the first polarizer.

6. The display panel according to claim 2 , wherein in the dimming liquid crystal cell, a porous structure is arranged inside the polymer, the second liquid crystal molecules are dispersed in the porous structure, and the second liquid crystal molecules are positive liquid crystals.

7. The display panel according to claim 1 , wherein the dimming liquid crystal cell further comprises a first electrode layer and a second electrode layer, the first electrode layer is arranged on a side of the second liquid crystal layer close to the panel body, and the second electrode layer is arranged on a side of the second liquid crystal layer away from the first electrode layer.

8. The display panel according to claim 1 , wherein the viewing angle adjustment liquid crystal cell further comprises a third electrode layer and a fourth electrode layer, the third electrode layer is arranged between the first polarizer and the first liquid crystal layer, and the fourth electrode layer is arranged between the second polarizer and the first liquid crystal layer;
wherein the polymer network is arranged along a second direction, and the second direction is inclined with respect to the normal direction of the first polarizer;
wherein a long axis of the first liquid crystal molecules is arranged along the second direction in the first mode; and
wherein in the second mode, the long axis of the first liquid crystal molecules is arranged along a third direction different from the second direction.

9. The display panel according to claim 1 , wherein the display panel further comprises a third polarizer, the third polarizer is arranged on a light-emitting side of the panel body, and an optical axis direction of the third polarizer is perpendicular to the optical axis direction of the first polarizer.

10. The display panel according to claim 1 , wherein in a brightness curve of the second liquid crystal layer in the second mode, brightness percentage corresponding to a viewing angle of 45 degrees is greater than 15%.

11. A display device comprising a backlight module and a display panel arranged on the backlight module, wherein the display panel comprises a first mode and a second mode, and a viewing angle of the display panel in the first mode is smaller than a viewing angle of the display panel in the second mode, the display panel comprising:
a viewing angle adjustment liquid crystal cell, wherein the viewing angle adjustment liquid crystal cell is configured to adjust a display viewing angle of the display panel, the viewing angle adjustment liquid crystal cell comprises a first liquid crystal layer, and the first liquid crystal layer comprises a polymer network and first liquid crystal molecules distributed in the polymer network;
a dimming liquid crystal cell, wherein the dimming liquid crystal cell and the viewing angle adjustment liquid crystal cell are overlapped, the dimming liquid crystal cell comprises a second liquid crystal layer, the second liquid crystal layer comprises a polymer and second liquid crystal molecules distributed in the polymer, and the dimming liquid crystal cell is configured to scatter incident light in the second mode; and
a panel body disposed on a light-emitting side of the viewing angle adjustment liquid crystal cell and the dimming liquid crystal cell,
wherein the display panel further comprises a first polarizer and a second polarizer, an optical axis direction of the first polarizer is parallel to an optical axis direction of the second polarizer, the first polarizer is arranged on the viewing angle adjustment liquid crystal cell, and the second polarizer is arranged on a side of the viewing angle adjustment liquid crystal cell away from the first polarizer;
wherein the second liquid crystal molecules comprise a first refractive index and a second refractive index, the first refractive index is a refractive index of the second liquid crystal molecules in a long axis direction, the second refractive index is a refractive index of the second liquid crystal molecules in a short axis direction, the first refractive index is greater than the second refractive index, and a refractive index of the polymer is equal to the second refractive index; and
wherein in the second mode, the long axis direction of the second liquid crystal molecules crosses a normal direction of the first polarizer.

12. The display device according to claim 11 , wherein the long axis direction of the second liquid crystal molecules is parallel to the normal direction of the f

Assignees

• Wuhan China Star Optoelectronics Technology Co Ltd

Inventors

• Ye Wenlong
• Cheng Wei
• He Rui

Classifications

• G02F1/1323

  Arrangements for providing a switchable viewing angle · CPC title

• G02F1/133531

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

• G02F1/13476

  in which at least one liquid crystal cell or layer assumes a scattering state · 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

• G02F1/1334

  based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals · CPC title