Color filter, method of making the same, and display device including the same

Patent metadata

Field	Value
Publication number	US-10126598-B2
Application number	US-201815872595-A
Country	US
Kind code	B2
Filing date	Jan 16, 2018
Priority date	Dec 16, 2015
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A color filter including a first region configured to emit a first light, a second region configured to emit a second light having a longer wavelength than a wavelength of the first light, a third region configured to emit a third light having a longer wavelength than the wavelength of the second light, a first layer including two or more quantum dots, and a second layer formed on at least one surface of the first layer, wherein the first layer and the second layer are disposed in at least the second region and the third region.

First claim

What is claimed is:

1. A color filter comprising:
a first region configured to emit a first light;
a second region configured to emit a second light having a longer wavelength than a wavelength of the first light;
a third region configured to emit a third light having a longer wavelength than the wavelength of the second light;
a first layer comprising a quantum dot; and
a second layer disposed on at least one surface of the first layer,
wherein the first region, the second region, and the third region are spaced apart from each other by a predetermined distance,
wherein the first layer is disposed to correspond to at least one of the second region and the third region, and the second layer is disposed to correspond to at least one of the second region and the third region, except for the first region, and
wherein the second layer has light transmittance of greater than or equal to about 80 percent with respect to the first light.

2. The color filter of claim 1 , wherein the first layer is disposed to correspond to the second region and the third region, except for the first region.

3. The color filter of claim 1 , wherein the first layer which corresponds to the second region and the first layer which corresponds to the third region are spaced apart from each other.

4. The color filter of claim 1 , wherein the quantum dot comprises a first quantum dot, and a second quantum dot which emits different light to the first quantum dot.

5. The color filter of claim 4 , wherein the first quantum dot is disposed in the first layer which corresponds to the second region, and the first quantum dot is configured to emit the second light having a longer wavelength than the wavelength of the first light by absorbing the first light.

6. The color filter of claim 5 , wherein the second light having a center wavelength in a range of 520 nm to 540 nm, and a full width half maximum in a range of 40 nm to 60 nm.

7. The color filter of claim 4 , wherein the second quantum dot is disposed in the first layer which corresponds to the third region, and the second quantum dot is configured to emit the third light having a longer wavelength than the wavelength of the first light by absorbing the first light.

8. The color filter of claim 7 , wherein the third light having a center wavelength in a range of 615 nm to 635 nm, and a full width half maximum in a range of 40 nm to 60 nm.

9. The color filter of claim 1 , wherein the first light is blue light.

10. The color filter of claim 1 , wherein a thickness of the second layer is in a range of about 10 percent to about 60 percent of a thickness of the first layer.

11. The color filter of claim 1 , wherein each of the first layer and the second layer comprises a photosensitive resin.

12. The color filter of claim 1 , wherein the first layer further comprises a light diffusing agent selected from a metal oxide particle, a metal particle, and a combination thereof.

13. The color filter of claim 1 , wherein the quantum dot comprises a Group II-VI compound, a Group III-V compound, a Group IV-VI compound, a Group IV compound, a Group II-III-VI compound, a Group I-II-IV-VI compound, or a combination thereof.

14. The color filter of claim 1 , wherein the first region comprises a transparent body.

15. The color filter of claim 1 , wherein the color filter receives the first light from a light source in a first direction, and wherein in the color filter the first layer is disposed in front of the second layer in the first direction.

16. A display device comprising:
a color filter comprising:
a first region configured to emit a first light;
a second region configured to emit a second light having a longer wavelength than a wavelength of the first light;
a third region configured to emit a third light having a longer wavelength than the wavelength of the second light;
a first layer comprising a quantum dot; and
a second layer disposed on at least one surface of the first layer,
wherein the first region, the second region, and the third region are spaced apart from each other by a predetermined distance, and
wherein the first layer is disposed to correspond to at least one of the second region and the third region, and wherein the second layer has light transmittance of greater than or equal to about 80 percent with respect to the first light;

a light source configured to emit the first light in a first direction;
a first substrate disposed in front of the light source in the first direction;
the color filter disposed in front of the first substrate in the first direction; and
a second substrate disposed in front of the color filter in the first direction,
wherein in the color filter the first layer is disposed in front of the second layer in the first direction.

17. The display device of claim 16 , wherein the quantum dot comprises a first quantum dot, and a second quantum dot which emits different light to the first quantum dot.

18. The display device of claim 17 , wherein the first quantum dot is disposed in the first layer which corresponds to the second region, and the first quantum dot is configured to emit the second light having a longer wavelength than the wavelength of the first light by absorbing the first light.

19. The display device of claim 18 , wherein the second light having a center wavelength in a range of 520 nm to 540 nm, and a full width half maximum in a range of 40 nm to 60 nm.

20. The display device of claim 17 , wherein the second quantum dot is disposed in the first layer which corresponds to the third region, and the second quantum dot is configured to emit the third light having a longer wavelength than the wavelength of the first light by absorbing the first light.

21. The display device of claim 20 , wherein the third light having a center wavelength in a range of 615 nm to 635 nm, and a full width half maximum in a range of 40 nm to 60 nm.

22. The display device of claim 16 , further comprising
a first polarizing plate disposed in front of the first substrate in the first direction, and
a second polarizing plate disposed in rear of the second substrate in the first direction.

23. The display device of claim 16 , wherein the display device is at least one of a liquid crystal display device, an organic light emitting diode display device, or a light emitting diode display.

24. The display device of claim 23 , wherein the display device is the liquid crystal display device, and the display device further comprises a liquid crystal layer interposed between the first substrate and the color filter or between the color filter and the second substrate.

Assignees

• Samsung Electronics Co Ltd
• Samsung Display Co Ltd
• Samsung Sdi Co Ltd

Inventors

• Han Yong Seok
• Won Nayoun
• Kang Hyun A
• Kwon Ha Il
• Park Shang Hyeun
• Jang Eun Joo
• Jun Shin Ae
• Chung Deukseok
• Jeong Tae Won

Classifications

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02F1/133621

  providing coloured light (G02F1/133617, G02F1/133533 take precedence) · CPC title

• G02F2001/133614

  Physics · mapped topic

• G02F1/133514 Primary

  Colour filters · CPC title

• G02F1/133615

  Edge-illuminating devices, i.e. illuminating from the side · CPC title