Coatable polarizer and liquid crystal display device having the same

Patent metadata

Field	Value
Publication number	US-9529227-B2
Application number	US-201514741660-A
Country	US
Kind code	B2
Filing date	Jun 17, 2015
Priority date	Jun 17, 2014
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

There is provided a coatable polarizer which incurs low manufacturing cost and has an excellent polarization degree and transmittance. A plurality of polarization layers are formed on the coatable polarizer, and each of the polarization layers include about 5 to 7 wt % of dichroic dyes, whereby a light component parallel to an alignment direction of a dichroic dye, among light having a wavelength corresponding to a color, is absorbed to have polarization characteristics.

First claim

What is claimed is:

1. A polarizer comprising:
a substrate; and
a plurality of polarization layers on the substrate,
wherein each of the polarization layers includes hosts and dichroic dyes having different colors.

2. The polarizer of claim 1 , further comprising:
an alignment layer between the substrate and the plurality of polarization layers.

3. The polarizer of claim 2 , wherein the hosts are formed of a material selected from reactive mesogens, liquid crystalline polymer, and oligomer.

4. The polarizer of claim 1 , wherein the hosts includes a photosensitive group and a photo-sensitive polymer.

5. The polarizer of claim 1 , wherein the dichroic dyes includes red, green, and blue dyes.

6. The polarizer of claim 1 , wherein the dichroic dyes includes cyan, yellow, and magenta dyes.

7. The polarizer of claim 1 , wherein the substrate includes transparent glass, plastic, or film.

8. The polarizer of claim 1 , wherein the plurality of polarization layers include:
a first polarization layer including a dichroic dye having a red (R) color;
a second polarization layer including a dichroic dye having a green (G) color; and
a third polarization layer including a dichroic dye having a blue (B) color.

9. The polarizer of claim 1 , wherein the plurality of polarization layers include:
a first polarization layer including two types of dichroic dyes among dichroic dyes having R, G, and B colors; and
a second polarization layer including a dichroic dye having other color of R, G, and B colors.

10. The polarizer of claim 1 , wherein the plurality of polarization layers include:
a first polarization layer including a dichroic dye having a cyan color;
a second polarization layer including a dichroic dye having a magenta color; and
a third polarization layer including a dichroic dye having a yellow color.

11. The polarizer of claim 1 , wherein the plurality of polarization layers include:
a first polarization layer including two types of dichroic dyes among dichroic dyes having cyan, magenta, and yellow colors; and
a second polarization layer including a dichroic dye having other color of cyan, magenta, and yellow colors.

12. The polarizer of claim 8 or 10 , wherein the content of dichroic dyes included in each of the polarization layers ranges from 1 to 7 wt %.

13. The polarizer of claim 12 , wherein the content of dichroic dyes included in each of the polarization layers ranges from 3 to 7 wt %.

14. The polarizer of claim 9 or 11 , wherein the content of the dichroic dyes included in the first polarization layer ranges from 1 to 3 wt %, and the content of the dichroic dyes included in the second polarization layer ranges from 1 to 7 wt %.

15. The polarizer of claim 1 , wherein the number of polarization layers is determined according to wavelength bands of light absorbed by each polarization layer.

16. The polarizer of claim 1 , wherein a thickness of the plurality of polarization layers is 10 μm or less.

17. The polarizer of claim 16 , wherein a thickness of the plurality of polarization layers is 5 μm or less.

18. A liquid crystal display (LCD) device comprising:
a liquid crystal panel for displaying an image; and
a polarizer attached to at least one of both surfaces of the liquid crystal panel,
wherein the polarizer includes a substrate and a plurality of polarization layers on the substrate, the polarization layer having dichroic dyes having different colors.

19. The LCD device of claim 18 , further comprising:
an alignment layer between the substrate and the plurality of polarization layers.

20. The LCD device of claim 18 , wherein the plurality of polarization layers include:
a first polarization layer including a dichroic dye having a red (R) color;
a second polarization layer including a dichroic dye having a green (G) color; and
a third polarization layer including a dichroic dye having a blue (B) color.

21. The LCD device of claim 18 , wherein the plurality of polarization layers include:
a first polarization layer including two types of dichroic dyes among dichroic dyes having R, G, and B colors; and
a second polarization layer including a dichroic dye having other color of R, G, and B colors.

22. The LCD device of claim 18 , wherein the plurality of polarization layers include:
a first polarization layer including a dichroic dye having a cyan color;
a second polarization layer including a dichroic dye having a magenta color; and
a third polarization layer including a dichroic dye having a yellow color.

23. The LCD device of claim 18 , wherein the plurality of polarization layers include:
a first polarization layer including two types of dichroic dyes among dichroic dyes having cyan, magenta, and yellow colors; and
a second polarization layer including dichroic dyes having other color of cyan, magenta, and yellow colors.

24. The LCD device of claim 20 or 22 , wherein the content of dichroic dyes included in each of the polarization layers ranges from 1 to 7 wt %.

25. The LCD device of claim 24 , wherein the content of dichroic dyes included in each of the polarization layers ranges from 3 to 7 wt %.

26. The LCD device of claim 21 or 23 , wherein the content of the dichroic dyes included in the first polarization layer ranges from 1 to 3 wt %, and the content of the dichroic dyes included in the second polarization layer ranges from 1 to 7 wt %.

27. The LCD device of claim 18 , wherein the liquid crystal panel includes an in-plane switching (IPS) mode LCD device, a vertical alignment (VA) mode LCD device, a fringe field switching (FFS) mode LCD device, and a twisted nematic (TN) mode LCD device.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Youngwook
• Noh Hyunjong
• Park Jiwoong

Classifications

• G02B5/3016

  involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528) · CPC title

• G02F1/133533 Primary

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

• G02B5/3041

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

• G02B5/305

  including organic materials, e.g. polymeric layers · CPC title