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Patent metadata

Field	Value
Publication number	US-10520765-B2
Application number	US-201816182153-A
Country	US
Kind code	B2
Filing date	Nov 6, 2018
Priority date	Sep 18, 2015
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

An optical stacking structure includes a color filter including a plurality of quantum dots which absorbs a first light and emits at least one of second light and third light that are different from the first light, a first optical filter layer disposed on the color filter, and a second optical filter layer disposed on the opposite side of the first optical filter based on the color filter. The first optical filter blocks at least a part of the first light, and the second optical filter transmits at least a part of the first light and reflects at least a part of the second light and the third light.

First claim

What is claimed is:

1. An optical stacking structure comprising:
a color filter comprising a plurality of quantum dots which absorbs first light and emits at least one of second light and third light, wherein the second light and the third light are different from the first light;
a first optical filter layer disposed on the color filter, wherein the first optical filter blocks at least a part of the first light; and
a second optical filter layer disposed on the opposite side of the first optical filter based on the color filter, wherein the second optical filter transmits at least a part of the first light and reflects at least a part of the second light and the third light,
wherein
the first optical filter layer, the color filter and the second optical filter layer are sequentially stacked one on another,
the first optical filter layer functions as a semi-transmission layer so that the first optical filter layer emits light around a wavelength corresponding to a resonance wavelength of a microcavity structure defined collectively by the first optical filter layer, the color filter and the second optical filter layer, and
the second optical filter layer functions as a reflection layer so that light, except for the light around the wavelength corresponding to the resonance wavelength of the microcavity structure, goes back and forth between the first optical filter layer and the second optical filter layer.

2. The optical stacking structure of claim 1 , wherein the color filter comprises:
a first region which emits the first light;
a second region which emits the second light; and
a third region which emits the third light,
wherein the first optical filter layer is disposed at a region corresponding to the second region and the third region.

3. The optical stacking structure of claim 2 , wherein the first region comprises a transparent body.

4. The optical stacking structure of claim 2 , wherein the second optical filter layer is disposed at a region corresponding to the first region, the second region, and the third region.

5. The optical stacking structure of claim 1 , further comprising:
a first substrate; and
a second substrate disposed opposite to the first substrate,
wherein the first optical filter layer, the color filter and the second optical filter layer are disposed between the first substrate and the second substrate.

6. The optical stacking structure of claim 1 , wherein the quantum dots comprise:
a plurality of first quantum dots which absorbs the first light and emits the second light having a longer wavelength than the first light; and
a plurality of second quantum dots which absorbs the first light and emits the third light having a longer wavelength than the first light and the second light.

7. The optical stacking structure of claim 6 , wherein the first quantum dots and the second quantum dots have different sizes from each other.

8. The optical stacking structure of claim 1 , wherein the first optical filter layer transmits light having a longer wavelength than the first light.

9. The optical stacking structure of claim 1 , wherein the first optical filter layer blocks light having a wavelength less than or equal to about 500 nanometers.

10. The optical stacking structure of claim 1 , wherein
the first light is a blue light,
the second light is a green light, and
the third light is a red light.

11. The optical stacking structure of claim 1 , wherein
the first optical filter layer has a multi-layered structure, and
the multi-layered structure comprises:
a first layer having a high refractive index; and
a second layer having a low refractive index and disposed on the first layer.

12. The optical stacking structure of claim 11 , wherein the number of the layers in the multi-layered structure is equal to or greater than four.

13. The optical stacking structure of claim 11 , wherein the first layer has a refractive index in a range of about 1.8 to about 2.6.

14. The optical stacking structure of claim 11 , wherein the second layer has a refractive index in a range of about 1.3 to about 1.8.

15. The optical stacking structure of claim 11 , wherein the first layer comprises at least one selected from hafnium oxide, tantalum oxide, titanium oxide, zirconium oxide, magnesium oxide, cesium oxide, lanthanum oxide, indium oxide, niobium oxide, aluminum oxide, and silicon nitride.

16. The optical stacking structure of claim 11 , wherein the second layer comprises a silicon oxide.

17. The optical stacking structure of claim 1 , wherein the first optical filter layer comprises:
a film comprising at least one selected from a metal, a conductive oxide and a combination thereof.

18. The optical stacking structure of claim 16 , wherein
the metal comprises at least one selected from aluminum silver, nickel, and chromium, and
the conductive oxide comprises at least one selected from indium tin oxide, aluminum zinc oxide, gallium zinc oxide and indium zinc oxide.

19. The optical stacking structure of claim 1 , wherein the second optical filter layer has a reflectance greater than or equal to about 60% to light having a wavelength greater than about 500 nanometers.

20. The optical stacking structure of claim 1 , wherein the second optical filter layer has a light transmittance greater than or equal to about 70% to light having a wavelength greater than about 500 nanometers.

21. The optical stacking structure of claim 1 , wherein the first optical filter has a light transmittance greater than or equal to about 70% to light having a wavelength greater than about 500 nanometers and less than or equal to 700 nanometers.

22. The optical stacking structure of claim 11 , wherein the first optical filter has a light transmittance greater than or equal to about 70% to light having a wavelength greater than about 500 nanometers and less than or equal to 700 nanometers.

23. The optical stacking structure of claim 1 , wherein the first optical filter layer and the second optical filter layer are spaced apart from each other with a distance determined based on an optical length.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Chung Deukseok

Classifications

• G02F2203/055

  wavelength filtering · CPC title

• G02F1/133617

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

• G02F1/21

  by interference · CPC title

• G02B5/283

  designed for the ultraviolet · CPC title

• G02B5/207

  comprising semiconducting materials · CPC title