Display device

Patent metadata

Field	Value
Publication number	US-12197094-B2
Application number	US-202117623280-A
Country	US
Kind code	B2
Filing date	Dec 15, 2021
Priority date	Dec 10, 2021
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

Disclosed is a display device including a display panel, a reflective polarizing layer, a liquid crystal dimmer cell, and a first polarizing plate which are sequentially stacked, wherein a reflection surface of the reflective polarizing layer faces the liquid crystal dimmer cell, and a direction of a transmission axis of the reflective polarizing layer is same as a direction of a transmission axis of the first polarizing plate, so that not only a peep-proof function of the display device can be realized, but also ambient light with a large viewing angle can be reflected, which can further reduce the visibility of the display screen under the large viewing angle without affecting the display at the front viewing angle.

First claim

What is claimed is:

1. A display device comprising:
a display panel;
a liquid crystal dimmer cell disposed on a light emitting side of the display panel and comprising a liquid crystal layer, wherein the liquid crystal layer comprises a polymer network and liquid crystals dispersed in the polymer network;
a first polarizing plate disposed on a side of the liquid crystal dimmer cell away from the display panel;
a reflective polarizing layer disposed between the liquid crystal dimmer cell and the display panel; and
a second polarizing plate disposed on a side of the display panel away from the light emitting side, wherein a direction of a transmission axis of the second polarizing plate is perpendicular to a direction of a transmission axis of the reflective polarizing layer; wherein,
a reflection surface of the reflective polarizing layer faces the liquid crystal dimmer cell, and the direction of the transmission axis of the reflective polarizing layer is same as a direction of a transmission axis of the first polarizing plate; and
the polymer network is arranged in a first direction, the first direction is inclined with respect to a normal line of the first polarizing plate, and the display device comprises a first display mode, and in the first display mode, a long axis of the liquid crystal is arranged in the first direction.

2. The display device according to claim 1 , wherein in the first display mode, an orthographic projection of the long axis of the liquid crystal on the first polarizing plate is parallel to a transmission axis of the first polarizing plate.

3. The display device according to claim 2 , wherein in the first display mode, an included angle between the long axis of the liquid crystal and the normal line of the first polarizing plate ranges from 55° to 89°.

4. The display device according to claim 1 , wherein the display device further comprises a second display mode, in the second display mode, the long axis of the liquid crystal is arranged in a second direction, the second direction is different from the first direction, and a viewing angle of emitted light of the display device in the second display mode is greater than a viewing angle of emitted light of the display device in the first mode.

5. The display device according to claim 4 , wherein the liquid crystal dimmer cell further comprises a first electrode and a second electrode respectively disposed on opposite sides of the liquid crystal layer, a potential of the first electrode is same as a potential of the second electrode in the first display mode, and there is a voltage difference between the first electrode and the second electrode in the second display mode.

6. The display device according to claim 5 , wherein in the second display mode, the second direction is perpendicular to or parallel to the normal line of the first polarizing plate.

7. The display device according to claim 6 , wherein the reflective polarizing layer comprises a substrate and a metal wire grid disposed on a side of the substrate close to the liquid crystal dimmer cell, the metal wire grid comprises a plurality of metal strips spaced apart from each other and arranged in parallel, and the plurality of metal strips are arranged in a direction parallel to the direction of the transmission axis of the first polarizing plate.

8. The display device according to claim 6 , wherein the reflective polarizing layer comprises an absorbent polarizing plate and a polarizing reflection film disposed on a side of the absorbent polarizing plate close to the liquid crystal dimmer cell, and a direction of a transmission axis of the absorbent polarizing plate is same as the direction of the transmission axis of the first polarizing plate, and a reflection axis direction of the polarizing reflection film is same as an absorption axis direction of the absorbent polarizing plate.

9. A display device comprising:
a display panel;
a liquid crystal dimmer cell disposed on a light emitting side of the display panel;
a first polarizing plate disposed on a side of the liquid crystal dimmer cell away from the display panel; and
a reflective polarizing layer disposed between the liquid crystal dimmer cell and the display panel; wherein,
a reflection surface of the reflective polarizing layer faces the liquid crystal dimmer cell, and a direction of a transmission axis of the reflective polarizing layer is same as a direction of a transmission axis of the first polarizing plate;
the liquid crystal dimmer cell comprises a liquid crystal layer, and the liquid crystal layer comprises a polymer network and liquid crystals dispersed in the polymer network;
the polymer network is arranged in a first direction inclined with respect to a normal line of the first polarizing plate; and
the display device comprises a first display mode, and in the first display mode, a long axis of the liquid crystal is arranged in the first direction.

10. The display device according to claim 9 , wherein in the first display mode, an orthographic projection of the long axis of the liquid crystal on the first polarizing plate is parallel to a transmission axis of the first polarizing plate.

11. The display device according to claim 10 , wherein, in the first display mode, an included angle between the long axis of the liquid crystal and the normal line of the first polarizing plate ranges from 55° to 89°.

12. The display device according to claim 9 , wherein the display device further comprises a second display mode, in the second display mode, the long axis of the liquid crystal is arranged in a second direction, the second direction is different from the first direction, and a viewing angle of emitted light of the display device in the second display mode is greater than a viewing angle of emitted light of the display device in the first display mode.

13. The display device according to claim 12 , wherein the liquid crystal dimmer cell further comprises a first electrode and a second electrode respectively disposed on opposite sides of the liquid crystal layer, a potential of the first electrode is same as a potential of the second electrode in the first display mode, and there is a voltage difference between the first electrode and the second electrode in the second display mode.

14. The display device according to claim 13 , wherein the liquid crystal dimmer cell comprises:
a first substrate;
a second substrate disposed opposite to the first substrate;
the liquid crystal layer sandwiched between the first substrate and the second substrate;
a first alignment layer disposed on a side of the first substrate facing the liquid crystal layer; and
a second alignment layer disposed on a side of the second substrate facing the liquid crystal layer; wherein the first electrode is disposed between the first substrate and the first alignment layer, and the second electrode is disposed between the second substrate and the second alignment layer.

15. The display device according to claim 13 , wherein in the second display mode, the second direction is perpendicular to or parallel to the normal line of the first polarizing plate.

16. The display device according to claim 15 , wherein the liquid crystal comprises either a positive liquid crystal or a negative liquid crystal.

17. The display device according to claim 12 , wherein the reflective polarizing layer comprises a substrate and a metal wire grid disposed on a side of the substrate close to the liquid crystal dimmer cell, the metal wire grid comprises a plurality of metal strips spaced apart from each other and arranged i

Assignees

• Wuhan China Star Optoelectronics Technology Co Ltd

Inventors

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

Classifications

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F1/133553

  Reflecting elements (associated to illuminating devices G02F1/133605) · CPC title

• G02F1/133536

  Reflective polarizers (G02F1/13362 takes precedence) · CPC title

• G02F1/1334 Primary

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

• G02F1/133531

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