Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9753327-B2
Application number	US-201615059845-A
Country	US
Kind code	B2
Filing date	Mar 3, 2016
Priority date	Jun 23, 2015
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A display device includes: a first polarizer, a second polarizer, a liquid crystal layer, a color conversion member, an emission layer, and a first substrate. The second polarizer is disposed on the first polarizer. The liquid crystal layer is disposed between the first polarizer and the second polarizer. The color conversion member is disposed between the liquid crystal layer and the second polarizer. The emission layer is disposed on the second polarizer. The emission layer is configured to absorb at least a portion of light passed through the color conversion member and the second polarizer, and to emit light corresponding to at least a blue wavelength. The first substrate is disposed on the emission layer.

First claim

What is claimed is:

1. A display device, comprising:
a first polarizer;
a second polarizer disposed on the first polarizer;
a liquid crystal layer disposed between the first polarizer and the second polarizer;
a color conversion member disposed between the liquid crystal layer and the second polarizer;
an emission layer disposed on the second polarizer, the emission layer configured to:
absorb at least a portion of light passed through the color conversion member and the second polarizer, and
emit light corresponding to at least a blue wavelength; and

a first substrate disposed on the emission layer.

2. The device of claim 1 , wherein:
at least a portion of the emission layer satisfies d 2 >d 1 and I 2 >I 1 ;
d 1 and d 2 represent lengths of light paths through the emission layer; and
I 2 and I 1 represent intensities of light from the emission layer in association with the light paths of lengths d 2 and d 1 , respectively.

3. The device of claim 1 , wherein:
a thickness of the emission layer is about 0.5 μm or less; and
the emission layer is configured to:
transmit a portion of incident light,
absorb a portion of the incident light, and
emit light of a wavelength different from a wavelength of the incident light.

4. The device of claim 1 , wherein the color conversion member comprises a red pixel region, a green pixel region, and a blue pixel region.

5. The device of claim 4 , wherein thickness of the blue pixel region is greater than thicknesses of the red pixel region and the green pixel region.

6. The device of claim 4 , wherein the color conversion member further comprises a white pixel region.

7. The device of claim 6 , wherein the emission layer comprises a pattern corresponding to the blue pixel region and the white pixel region.

8. The device of claim 1 , wherein the emission layer comprises at least one of a quantum dot and a fluorescent substance.

9. The device of claim 8 , wherein the emission layer further comprises at least one of blue pigment, blue dye, and a scatterer.

10. The device of claim 1 , wherein the second polarizer comprises a wire grid polarizer.

11. The device of claim 1 , further comprising:
a second substrate facing the first substrate, the liquid crystal layer being disposed between the first substrate and the second substrate,
wherein the first polarizer is disposed between the second substrate and the liquid crystal layer or the second substrate is disposed between the first polarizer and the liquid crystal layer.

12. The device of claim 1 , further comprising:
a backlight unit configured to emit white light towards the first polarizer.

13. A display device, comprising:
a first polarizer;
a second polarizer disposed on the first polarizer;
a liquid crystal layer disposed between the first polarizer and the second polarizer;
a color conversion member disposed between the liquid crystal layer and the first polarizer;
an emission layer disposed on the second polarizer, the emission layer configured to:
absorb at least a portion of light passed through the color conversion member and the second polarizer, and
emit light of a wavelength different from a wavelength of the absorbed light; and

a first substrate disposed on the emission layer.

14. The device of claim 13 , wherein:
at least a portion of the emission layer satisfies d 2 >d 1 and I 2 >I 1 ;
d 1 and d 2 represent lengths of light paths through the emission layer; and
I 2 and I 1 represent intensities of light from the emission layer in association with the light paths of lengths d 2 and d 1 , respectively.

15. The device of claim 13 , wherein:
a thickness of the emission layer is about 0.5 μm or less; and
the emission layer is configured to:
transmit a portion of incident light,
absorb a portion of the incident light, and
emit light corresponding to at least a blue wavelength.

16. The device of claim 13 , wherein the color conversion member comprises a red pixel region, a green pixel region, and a blue pixel region.

17. The device of claim 16 , wherein the color conversion member further comprises a white pixel region.

18. The device of claim 13 , wherein the emission layer comprises at least one of a quantum dot and a fluorescent substance.

19. The device of claim 18 , wherein the emission layer further comprises at least one of blue pigment, blue dye, and a scatterer.

20. The device of claim 13 , wherein the second polarizer comprises a wire grid polarizer.

Assignees

• Samsung Display Co Ltd

Inventors

• Park Haeil
• Park Kisoo
• Kwon Junghyun
• Kim Youngmin
• Lee Kwangkeun
• Lee Junhan

Classifications

• G02F2001/133614

  Physics · mapped topic

• G02F1/133617 Primary

  Illumination with ultraviolet light; Luminescent elements or materials associated to the cell · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02F2001/133548

  Physics · mapped topic

• G02F1/1335 Primary

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title