Display device

Patent metadata

Field	Value
Publication number	US-9753194-B2
Application number	US-201514596452-A
Country	US
Kind code	B2
Filing date	Jan 14, 2015
Priority date	Apr 9, 2014
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A display device includes a first substrate, and a second substrate opposing the first substrate and including a color filter layer. The color filter layer includes a red color filter, a green color filter and a blue color filter. The red color filter includes a first fluorescent dye and a first nanoparticle, and illustrates red color. The green color filter includes a second fluorescent dye and a second nanoparticle and illustrates green color. The blue color filter includes a third fluorescent dye and a third nanoparticle and illustrates blue color. Each of the first to third nanoparticles has a non-spherical shape and has maximum extinction at the first wavelength, the second wavelength and the third wavelength. The first wavelength is greater than the second wavelength, and the second wavelength is greater than the third wavelength.

First claim

What is claimed is:

1. A display device, comprising:
a first substrate; and
a second substrate opposing the first substrate and comprising a color filter layer, the color filter layer comprising:
a red color filter comprising a first fluorescent dye being provided with first light and emitting second light having a different wavelength from the first light, and a first nanoparticle being provided with the first light and generating surface Plasmon resonance, the red color filter illustrating red color,
a green color filter comprising a second fluorescent dye being provided with the first light and emitting third light having a different wavelength from the first light and the second light, and a second nanoparticle being provided with the first light and generating surface Plasmon resonance, the green color filter illustrating green color; and
a blue color filter comprising a third fluorescent dye being provided with the first light and emitting fourth light having a different wavelength from the first light to the third light, and a third nanoparticle being provided with the first light and generating surface Plasmon resonance, the blue color filter illustrating blue color,
each of the first to third nanoparticles having a non-spherical shape,
the first nanoparticle having a physical configuration that provides maximum extinction comprised of both absorption and scattering at a first wavelength,
the second nanoparticle having a physical configuration that provides maximum extinction comprised of both absorption and scattering at a second wavelength smaller than the first wavelength,
the third nanoparticle having a physical configuration that provides maximum extinction comprised of both absorption and scattering at a third wavelength smaller than the second wavelength, and
wherein the cross-sectional shapes of the first to third nanoparticles are hexagonal, and
the cross-sectional shape of the first nanoparticle has a first hexagon,
the cross-sectional shape of the second nanoparticle has a second hexagon,
the cross-sectional shape of the third nanoparticle has a third hexagon,
the third hexagon is closer to a regular hexagon than the second hexagon, and
the second hexagon is closer to a regular hexagon than the first hexagon.

2. The display device of claim 1 , wherein
the first hexagon comprises a first side and a second side connected to each other,
the second hexagon comprises a first side and a second side connected to each other,
the third hexagon comprises a first side and a side connected to each other, and
|A−1|>|B−1|>|C−1| is satisfied when ratio of a length of the first side of the first hexagon to a length of the second side of the first hexagon is A, ratio of a length of the first side of the second hexagon to a length of the second side of the second hexagon is B, and ratio of a length of the first side of the third hexagon to a length of the second side of the third hexagon is C.

3. The display device of claim 1 , wherein each of the first to third nanoparticles has a hexagonal prism shape.

4. The display device of claim 3 , wherein the heights of the first to third nanoparticles are substantially the same.

5. The display device of claim 1 , wherein
the first nanoparticle comprises non-spherical unit nanoparticle blocks,
the second nanoparticle comprises the unit nanoparticle blocks, and
the third nanoparticle comprises one or more of the unit nanoparticle blocks,
where the number of the unit particle blocks in the first nanoparticle is “a,” the number of the unit particle blocks in the second nanoparticle is “b,” and the number of the unit particle block or the unit particle blocks in the third nanoparticle is “c,” a, b and c being natural numbers satisfying a>b>c.

6. The display device of claim 5 , wherein the first, second and third nanoparticles have rod shapes having different lengths, wherein the first nanoparticle is shorter than the second nanoparticle which is shorter than the third nanoparticle.

7. The display device of claim 5 , wherein the cross-sectional shapes of the first, second and third nanoparticles are substantially same.

8. The display device of claim 7 , wherein the cross-sectional shapes of the first, second and third nanoparticles have a circular shape or an elliptical shape.

9. The display device of claim 1 , wherein each of the first to third nanoparticles has a cavity or a hole.

10. The display device of claim 1 , wherein the first to third nanoparticles are formed of the same material.

11. The display device of claim 10 , wherein each of the first to third nanoparticles is formed of at least one metal selected from the group consisting of Au, Ag, Al, Co, Cu, Cr, Pt, Ni, Fe, Mo and W, or an oxide of a selected metal.

12. The display device of claim 1 , wherein
the first wavelength is from about 600 nm to about 750 nm,
the second wavelength is from about 500 nm to about 550 nm, and
the third wavelength is from about 430 nm to about 480 nm.

13. The display device of claim 1 , wherein each of the red, green and blue color filters further comprises a leveling agent, and
wherein each of the first to third nanoparticle combines with the leveling agent and
each of a first nanoparticle combined with the leveling agent, a second nanoparticle combined with the leveling agent and a third nanoparticle combined with a leveling agent has a spherical shape.

14. The display device of claim 13 , wherein the leveling agent includes at least one selected from the group consisting of hexane, heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, pentadecane, hexadecane, cetane, heptadecane, octadecane, nonadecane and icosane.

15. The display device of claim 1 , wherein the first substrate comprises a light emission layer, and the first fluorescent dye is configured to absorb light from the light emission layer and emit red color light, wherein the second fluorescent dye is configured to absorb light from the light emission layer and emit green color light, wherein the third fluorescent dye is configured to absorb light from the light emission layer and emit blue color light.

16. A display device, comprising:
a first substrate; and
a second substrate facing the first substrate and comprising a color filter layer, the color filter layer comprising:
a red color filter comprising a first fluorescent dye being provided with first light and emitting second light having a different wavelength from the first light, and a first nanoparticle, the red color filter illustrating red color;
a green color filter comprising a second fluorescent dye being provided with the first light and emitting third light having a different wavelength from the first light and the second light, and a second nanoparticle, the green color filter illustrating green color; and
a blue color filter comprising a third fluorescent dye being provided with the first light and emitting fourth light having a different wavelength from the first light to the third light, and a third nanoparticle, the blue color filter illustrating blue color,
each of the first to third nanoparticles having a non-spherical shape,
the first nanoparticle having a physical configuration that provides maximum extinction comprised of both absorption and scattering at a first wavelength,
the second nanoparticle having a physical configuration that provides maximum extinction comprised of both absorption and scattering at a second wavelength smaller than the first wavelength,
the third nanoparticle having a physical configuration that provides maximum extinction comprised of

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Minsu
• Huh Chul

Classifications

• G03F7/105

  having substances, e.g. indicators, for forming visible images · CPC title

• G02F1/133514

  Colour filters · CPC title

• G02B5/201 Primary

  in the form of arrays · CPC title

• G03F7/0007

  Filters, e.g. additive colour filters; Components for display devices · CPC title

• G02B5/223

  containing organic substances, e.g. dyes, inks or pigments · CPC title