Polarizer and display device

Patent metadata

Field	Value
Publication number	US-9690025-B2
Application number	US-201314359371-A
Country	US
Kind code	B2
Filing date	Jun 17, 2013
Priority date	Mar 28, 2013
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A polarizer is disclosed and it is used in combination with a reflection layer. The polarizer comprises a polarizing layer ( 702 ) and a compensation layer ( 704 ). The compensation layer ( 704 ) is disposed between the polarizing layer ( 702 ) and the reflection layer. Accordingly, a display device comprising the polarizer is also disclosed. The polarizer solves the problem of oblique light leakage of OLED displays.

First claim

What is claimed is:

1. A polarizer, wherein the polarizer is configured as being used in combination with a reflection layer, the polarizer comprises a polarizing layer and a compensation layer, the compensation layer is disposed between the polarizing layer and the reflection layer,
wherein the compensation layer comprises a quarter-wave plate and an optical compensation film, the optical compensation film is disposed between the polarizing layer and the quarter-wave plate, the optical compensation film is made of a wave plate;
a refractive index factor of the optical compensation film is in a range from 0.3 to 0.4, phase retardation is in a range from 240 nm to 300 nm, and an angle between a slow axis of the optical compensation film and a transmission axis of the polarizing layer is in a range from −5° to +5°;
or a refractive index factor of the optical compensation film is in a range from 0.7 to 0.8, phase retardation is in a range from 240 nm to 300 nm, and an angle between a slow axis of the optical compensation film and a transmission axis of the polarizing layer is in a range from +85° to +95° or in a range from −95° to −85°.

2. The polarizer of claim 1 , wherein
the refractive index factor of the optical compensation film is 0.25, the phase retardation is 275 nm, and the angle between the slow axis of the optical compensation film and the transmission axis of the polarizing layer is 0°;
or the refractive index factor of the optical compensation film is 0.75, the phase retardation is 275 nm, and the angle between the slow axis of the optical compensation film and the transmission axis of the polarizing layer is +90° or −90°.

3. The polarizer of claim 1 , wherein
the compensation layer comprises a quarter-wave plate, a first optical compensation film and a second optical compensation film, the first optical compensation film is disposed on a surface of the polarizing layer that is close to the reflection layer, the second optical compensation film is disposed on a surface of the first optical compensation film that is close to the reflection layer, the quarter-wave plate is disposed on a surface of the second optical compensation film that is close to the reflection layer, the first optical compensation film and the second optical compensation film are both made of wave plates.

4. The polarizer of claim 3 , wherein
a refractive index factor of the first optical compensation film is smaller than or equal to 0, a refractive index factor of the second optical compensation film is larger than or equal to 1, phase retardations of both the first optical compensation film and the second optical compensation film are in a range from 110 nm to 160 nm, and an angle between any one of slow axes of the first optical compensation film and the second optical compensation film and a transmission axis of the polarizing layer is in a range from +85° to +95° or in a range from −95° to −85°.

5. The polarizer of claim 3 , wherein
a refractive index factor of the first optical compensation film is larger than or equal to 1, a refractive index factor of the second optical compensation film is smaller than or equal to 0, phase retardations of both the first optical compensation film and the second optical compensation film are in a range from 110 nm to 160 nm, and an angle between any one of slow axes of the first optical compensation film and the second optical compensation film and a transmission axis of the polarizing layer is in a range from −5° to +5°.

6. The polarizer of claim 3 , wherein
a refractive index factor of the first optical compensation film is smaller than or equal to 0, an angle between its slow axis and a transmission axis of the polarizing layer is in a range from −5° to +5°, a refractive index factor of the second optical compensation film is larger than or equal to 1, an angle between its slow axis and a transmission axis of the polarizing layer is in a range from +85° to +95° or in a range from −95° to −85°, phase retardations of both the first optical compensation film and the second optical compensation film are in a range from 110 nm to 160 nm.

7. The polarizer of claim 3 , wherein
a refractive index factor of the first optical compensation film is larger than or equal to 1, and an angle between its slow axis and a transmission axis of the polarizing layer is in a range from +85° to +95° or in a range from −95° to −85°; a refractive index factor of the second optical compensation film is smaller than or equal to 0, and an angle between its slow axis and a transmission axis of the polarizing layer is in a range from −5° to +5°; phase retardations of both the first optical compensation film and the second optical compensation film are in a range from 110 nm to 160 nm.

8. The polarizer of claim 4 , wherein
the refractive index factor of the first optical compensation film is smaller than or equal to 0, the refractive index factor of the second optical compensation film is larger than or equal to 1, the phase retardations of both the first optical compensation film and the second optical compensation film are 137 nm, and the angle between any one of slow axes of the first optical compensation film and the second optical compensation film and the transmission axis of the polarizing layer is +90° or −90°.

9. The polarizer of claim 5 , wherein
the refractive index factor of the first optical compensation film is larger than or equal to 1, the refractive index factor of the second optical compensation film is smaller than or equal to 0, the phase retardations of both the first optical compensation film and the second optical compensation film are 137 nm, and the angle between any one of slow axes of the first optical compensation film and the second optical compensation film and the transmission axis of the polarizing layer is 0°.

10. The polarizer of claim 6 , wherein
the refractive index factor of the first optical compensation film is smaller than or equal to 0, and the angle between its slow axis and a transmission axis of the polarizing layer is 0°; the refractive index factor of the second optical compensation film is larger than or equal to 1, and the angle between its slow axis and a transmission axis of the polarizing layer is +90° or −90°; the phase retardations of both the first optical compensation film and the second optical compensation film are 137 nm.

11. The polarizer of claim 7 , wherein
the refractive index factor of the first optical compensation film is larger than or equal to 1, and the angle between its slow axis and a transmission axis of the polarizing layer is +90° or −90°; the refractive index factor of the second optical compensation film is smaller than or equal to 0, and the angle between its slow axis and a transmission axis of the polarizing layer is 0°; the phase retardations of both the first optical compensation film and the second optical compensation film are 137 nm.

12. The polarizer of claim 1 , wherein the compensation layer comprises a quarter-wave plate, a refractive index factor of the quarter-wave plate is in a range from 0.4 to 0.6, phase retardation is in a range from 110 nm to 160 nm, and an angle between the slow axis of the quarter-wave plate and the transmission axis of the polarizing layer is in a range from +40° to +50° or in a range from −50° to −40°.

13. The polarizer of claim 12 , wherein the refractive index factor of the quarter-wave plate is 0.5, the phase retardation is 137.5 nm, and the angle between the slow axis of the quarter-wave plate and the transmission axis of the polarizing layer is +45° or −45°.

14. The polarizer of claim 1 , wherein the compensation layer

Assignees

• Boe Technology Group Co Ltd

Inventors

• Qin Guangkui

Classifications

• G02B5/3041

  comprising multiple thin layers, e.g. multilayer stacks · CPC title

• G02B1/14

  Protective coatings, e.g. hard coatings · CPC title

• G02B5/3083 Primary

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title