Display device

Patent metadata

Field	Value
Publication number	US-9964806-B2
Application number	US-201615229706-A
Country	US
Kind code	B2
Filing date	Aug 5, 2016
Priority date	Feb 17, 2016
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A display device includes a plurality of pixels; a first substrate including a pixel electrode disposed in a pixel of the plurality of pixels, a second substrate facing the first substrate and including a color adjusting pattern, which is disposed in the pixel of the plurality of pixels, and a common electrode, which is disposed on the color adjusting patterns, and a liquid crystal layer interposed between the first substrate and the second substrate and including a liquid crystal and a dichroic dye, wherein the plurality of pixels include a first-color pixel, which is configured to display a first color, and a second-color pixel, which is configured to display a second color different from the first color, and the color adjusting pattern includes a first color adjusting pattern, which is disposed in the first-color pixel, and a second color adjusting pattern, which is disposed in the second-color pixel.

First claim

What is claimed is:

1. A display device comprising:
a plurality of pixels;
a first substrate comprising a pixel electrode disposed in a pixel of the plurality of pixels;
a second substrate facing the first substrate, the second substrate comprising a color adjusting pattern, which is disposed in the pixel of the plurality of pixels, and a common electrode, which is disposed on the color adjusting pattern; and
a liquid crystal layer interposed between the first substrate and the second substrate, and comprising a liquid crystal and a dichroic dye,
wherein:
the plurality of pixels comprises a first-color pixel, which is configured to display a first color, and a second-color pixel, which is configured to display a second color different from the first color;
the color adjusting pattern comprises a first color adjusting pattern, which is disposed in the first-color pixel, and a second color adjusting pattern, which is disposed in the second-color pixel; and
the first color adjusting pattern is configured to convert a wavelength of incident light into a first color, and the second color adjusting pattern is configured to convert the wavelength of incident light into a second-color wavelength.

2. The display device of claim 1 , wherein:
the plurality of pixels further comprise a third-color pixel, which is configured to display a third color different from the first color and the second color; and
the color adjusting pattern further comprises a third color adjusting pattern, which is disposed in the third-color pixel and is configured to convert the wavelength of incident light into a third-color wavelength.

3. The display device of claim 2 , further comprising:
a light source assembly disposed on a surface of the first substrate, and comprising a blue light source.

4. The display device of claim 3 , wherein the third color adjusting pattern further comprises light scattering particles.

5. The display device of claim 4 , wherein the dichroic dye comprises at least one anthraquinone dye selected from structures 1 to 4 of Formula 1:

6. The display device of claim 1 , wherein:
the first substrate further comprises a first alignment layer aligned in a first direction;
the second substrate further comprises a second alignment layer aligned in a second direction different from the first direction; and
the liquid crystal layer is disposed between the first alignment layer and the second alignment layer.

7. The display device of claim 6 , wherein the liquid crystal comprises a chiral dopant, and the liquid crystal is a twisted nematic (TN) liquid crystal, which is twisted and horizontally aligned between the first alignment layer and the second alignment layer.

8. The display device of claim 7 , wherein the liquid crystal layer has a u value of about a square root of 15, wherein u is determined by following Equation 11:

u
=

2
⁢
Δ
⁢

⁢
nd

λ

Equation
⁢

⁢
11

where d is a cell gap of the liquid crystal layer, Δn is a refractive index anisotropy of the liquid crystal, and λ is a wavelength of light incident upon the liquid crystal layer from the blue light source.

9. The display device of claim 1 , wherein:
the first substrate further comprises a first alignment layer;
the second substrate further comprises a second alignment layer having a same alignment direction as the first alignment layer; and
the liquid crystal is horizontally aligned on the first alignment layer and on the second alignment layer.

10. The display device of claim 1 , wherein:
the first substrate further comprises a first alignment layer;
the second substrate further comprises a second alignment layer having a same alignment direction as the first alignment layer; and
the liquid crystal is vertically aligned on the first alignment layer and on the second alignment layer.

11. The display device of claim 1 , wherein:
the pixel electrode comprises branches and slits, the slits being disposed between the branches; and
a direction in which the branches extends is the same as a direction in which the slits extend.

12. The display device of claim 1 , further comprising:
a polarizing member disposed on a surface of the first substrate.

13. The display device of claim 12 , wherein the polarizing member is not interposed between the liquid crystal layer and the color adjusting pattern.

14. A display device comprising:
a plurality of pixels;
a first substrate comprising a pixel electrode disposed in a pixel of the plurality of pixels, and a common electrode, which is electrically insulated from the pixel electrode;
a second substrate facing the first substrate and comprising a color adjusting pattern disposed in a pixel of the plurality of pixels; and
a liquid crystal layer interposed between the first substrate and the second substrate, and comprising liquid crystal and a dichroic dye,
wherein:
the pixels comprise a first-color pixel, which is configured to display a first color, and a second-color pixel, which is configured to display a second color different from the first color;
the color adjusting pattern comprises a first color adjusting pattern, which is disposed in the first-color pixel, and a second color adjusting pattern, which is disposed in the second-color pixel; and
the first color adjusting pattern is configured to convert a wavelength of incident light into a first color wavelength, and the second color adjusting pattern is configured to convert the wavelength of incident light into a second-color wavelength.

15. The display device of claim 14 , wherein:
the plurality of pixels further comprise a third-color pixel, which is configured to display a third color different from the first color and the second color; and
the color adjusting pattern further comprises a third color adjusting pattern, which is disposed in the third-color pixel and is configured to convert the wavelength of incident light into a third-color wavelength.

16. The display device of claim 15 , further comprising:
a light source assembly disposed on a surface of the first substrate and comprising a blue light source.

17. The display device of claim 16 , wherein the third color adjusting pattern further comprises light scattering particles.

18. The display device of claim 17 , wherein the dichroic dye comprises at least one anthraquinone dye selected from structures 1 to 4 of Formula 1:

19. The display device of claim 14 , wherein:
the first substrate further comprises a first alignment layer aligned in a first direction;
the second s

Assignees

• Samsung Display Co Ltd
• Samsung Display Co Ltd

Inventors

• Jang Yun
• Roh Nam Seok
• Park Seung Beom

Classifications

• G02F2203/03

  scattering · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title

• C09K19/603

  Anthroquinonic · CPC title

• G02F1/133617 Primary

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

• G02F1/13725

  based on guest-host interaction (G02F1/13762, G02F1/13737, take precedence) · CPC title