Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-10254582-B2
Application number	US-201615119725-A
Country	US
Kind code	B2
Filing date	Jul 20, 2016
Priority date	Jun 20, 2016
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

The invention provides an LCD device, whose polarizers comprising: a plurality of polarizing units disposed corresponding to the first, second and third sub-pixels and arranged in an array; each polarizing unit being a multilayer film structure, comprising a transparent body, and a plurality of first film layers and a plurality of second film layers interleaved into a stack disposed on the body. By achieving polarization through multilayer film structure and each polarizing unit only needing to satisfy polarization conditions for light of the wavelength range of light emitted by corresponding sub-pixel, the invention can reduce material selection difficulty and production difficult for multilayer structure and improve LCD contrast.

First claim

What is claimed is:

1. A liquid crystal display (LCD) device, which comprises: a backlight module, an LCD panel disposed above the backlight module, and two polarizers each disposed at one of two sides of the LCD panel, respectively;
the LCD panel comprising: a first sub-pixel, a second sub-pixel, and a third sub-pixel arranged in an array, the first, second and third sub-pixels emitting different color of light;
each polarizer comprising: a plurality of polarizing units disposed respectively corresponding to the first, second and third sub-pixels;
each polarizing unit being a multilayer film structure, comprising a transparent body, and a plurality of first film layers and a plurality of second film layers interleaved into a stack disposed on the body;
for the polarizing unit disposed corresponding to each sub-pixel, the polarizing unit satisfying the following equation for the light within the wavelength range of the light emitted by the sub-pixel:

n
H
2

⁢

n
L
2

n
H
2

+

n
L
2

=

n
G
2

⁢

⁢

Sin
2

⁢

θ
G

wherein n H being the refraction index of each of the first film layers regarding the light within the wavelength range, n L being the refraction index of each of the second film layers regarding the light within the wavelength range, n H >n L , n G being the refraction index of the body regarding the light within the wavelength range, and θ G being an angle inside the body between the light within the wavelength range and an imaginary line normal to a surface of the body opposite to the first and second film layers.

2. The LCD device as claimed in claim 1 , wherein the first, second and third sub-pixels emit light of red, green and blue respectively.

3. The LCD device as claimed in claim 1 , wherein the polarizers are formed by vapor deposition, sputtering or spin coating.

4. The LCD device as claimed in claim 1 , wherein the sum of the number of layers in the first film layers and the second film layers of each polarizing unit is 20-100 layers.

5. The LCD device as claimed in claim 1 , wherein the first film layers and the second film layers are made of metal.

6. The LCD device as claimed in claim 1 , wherein each of the first film layers and each of the second film layers have the optical thickness of 100 nm-400 nm.

7. The LCD device as claimed in claim 1 , wherein the optical thickness ratio between a first film layer and a second film layer is 1:0.6-1.5.

8. The LCD device as claimed in claim 7 , wherein the first film layer and the second film layer have the same optical thickness.

9. The LCD device as claimed in claim 7 , wherein the optical thickness ratio between the first film layer and the second film layer is 1:1.5.

10. The LCD device as claimed in claim 1 , wherein the body is made of glass.

11. A liquid crystal display (LCD) device, which comprises: a backlight module, an LCD panel disposed above the backlight module, and two polarizers each disposed at one of two sides of the LCD panel, respectively;
the LCD panel comprising: a first sub-pixel, a second sub-pixel, and a third sub-pixel arranged in an array, the first, second and third sub-pixels emitting different color of light;
each polarizer comprising: a plurality of polarizing units disposed respectively corresponding to the first, second and third sub-pixels;
each polarizing unit being a multilayer film structure, comprising a transparent body, and a plurality of first film layers and a plurality of second film layers interleaved into a stack disposed on the body;
for the polarizing unit disposed corresponding to each sub-pixel, the polarizing unit satisfying the following equation for the light within the wavelength range of the light emitted by the sub-pixel:

n
H
2

⁢

n
L
2

n
H
2

+

n
L
2

=

n
G
2

⁢

⁢

Sin
2

⁢

θ
G

wherein n H being the refraction index of each of the first film layers regarding the light within the wavelength range, n L being the refraction index of each of the second film layers regarding the light within the wavelength range, n H >n L , n G being the refraction index of the body regarding the light within the wavelength range, and θ G being an angle inside the body between the light within the wavelength range and an imaginary line normal to a surface of the body opposite to the first and second film layers;
wherein the first, second and third sub-pixels emitting light of red, green and blue respectively;
wherein the polarizers being formed by vapor deposition, sputtering or spin coating.

12. The LCD device as claimed in claim 11 , wherein the sum of the number of layers in the first film layers and the second film layers of each polarizing unit is 20-100 layers.

13. The LCD device as claimed in claim 11 , wherein the first film layers and the second film layers are made of metal.

14. The LCD device as claimed in claim 11 , wherein each of the first film layers and each of the second film layers have the optical thickness of 100 nm-400 nm.

15. The LCD device as claimed in claim 11 , wherein the optical thickness ratio between a first film layer and a second film layer is 1:0.6-1.5.

16. The LCD device as claimed in claim 15 , wherein the first film layer and the second film layer have the same optical thickness.

17. The LCD device as claimed in claim 15 , wherein the optical thickness ratio between the first film layer and the second film layer is 1:1.5.

18. The LCD device as claimed in claim 11 , wherein the body is made of glass.

Assignees

• Shenzhen China Star Optoelect

Inventors

• Sun Zhenhua
• Chen Lixuan

Classifications

• G02F2001/133545

  Physics · mapped topic

• G02F1/133533

  Colour selective polarisers (G02F1/1347 takes precedence) · CPC title

• G02F1/133528 Primary

  Polarisers · CPC title

• G02B5/3041

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

• G02F1/133545

  Dielectric stack polarisers · CPC title