Display panel and display device having the same

Patent metadata

Field	Value
Publication number	US-10114247-B2
Application number	US-201615095678-A
Country	US
Kind code	B2
Filing date	Apr 11, 2016
Priority date	Jul 31, 2015
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A display panel and display device having the same are provided. The display panel includes a quantum dot color filter layer configured to convert a color of light; a transparent front substrate provided at a first side of the quantum dot color filter layer; and a low refractive layer provided between the quantum dot color filter layer and the front substrate, the low refractive layer having a refractive index that is lower than a refractive index of the quantum dot color filter layer.

First claim

What is claimed is:

1. A display panel comprising:
a quantum dot color filter layer configured to convert a color of light emitted from a back light unit, the quantum dot color filter layer having a first refractive index;
a transparent front substrate provided at a first side of the quantum dot color filter layer, the transparent front substrate having a second refractive index;
a low refractive layer provided between the quantum dot color filter layer and the transparent front substrate, the low refractive layer having a third refractive index that is lower than the first refractive index of the quantum dot color filter layer; and
a cutoff layer disposed between the transparent front substrate and the low refractive layer to cut off the light not converted by the quantum dot color filter layer,
wherein the third refractive index of the low refractive layer is lower than the second refractive index of the transparent front substrate, and
wherein the second refractive index of the transparent front substrate is higher than the first refractive index of the quantum dot color filter layer.

2. The display panel of claim 1 , wherein the third refractive index of the low refractive layer falls within a range of between 1.0 and 1.4.

3. The display panel of claim 1 , wherein the low refractive layer comprises a resin within which nano-particles are distributed, and
wherein the nano-particles include at least one from among titanium dioxide (TiO 2 ) and zinc oxide (ZnO).

4. The display panel of claim 1 , wherein the light comprises blue light, and
wherein the display panel further comprises a reflective layer provided at a second side of the quantum dot color filter layer that is opposite to the first side of the quantum dot filter color layer, the reflective layer being configured to transmit the blue light therethrough and reflect light that has a wavelength longer than a wavelength of the blue light.

5. The display panel of claim 1 , further comprising an anti-reflective (AR) layer coated on a surface of the transparent front substrate and configured to prevent Fresnel reflection.

6. A display panel comprising:
a quantum dot color filter layer comprising a plurality of converters and partition walls provided between the plurality of converters, each of the plurality of converters comprising quantum dot particles configured to convert a color of light, and each of the partition walls being configured to absorb light;
a front substrate provided at a first side of the quantum dot color filter layer;
a low refractive layer provided between the quantum dot color filter layer and the front substrate and having a refractive index that is lower than a refractive index of the quantum dot color filter layer;
a cutoff layer disposed between the front substrate and the low refractive layer to cut off the light not converted by the quantum dot color filter layer; and
reflective walls which surround the partition walls and are configured to reflect light which propagates toward the partition walls,
wherein the refractive index of the low refractive layer is lower than the refractive index of the front substrate, and
wherein the refractive index of the front substrate is higher than the refractive index of the quantum dot color filter layer.

7. The display panel of claim 6 , wherein each of the reflective walls includes at least one reflective material from among titanium dioxide (TiO 2 ), zinc oxide (ZnO), iron oxide (Fe 2 O 3 ), chrome oxide (CrO), cobalt oxide (CoO), stannic oxide (SnO2), talc, and kaolin (Al 2 Si 2 O 5 (OH) 4 ).

8. The display panel of claim 6 , wherein the refractive index of the low refractive layer falls within a range of between 1.0 and 1.4.

9. The display panel of claim 8 , wherein the low refractive layer comprises a resin within which nano-particles are distributed, and wherein the nano-particles include at least one from among titanium dioxide (TiO 2 ) and zinc oxide (ZnO).

10. The display panel of claim 8 , wherein the refractive index of the low refractive layer is lower than a refractive index of the front substrate.

11. The display panel of claim 8 , further comprising an anti-reflective (AR) layer coated on a surface of the front substrate and configured to prevent Fresnel reflection.

12. A display device comprising:
a back light unit which includes a light source configured to emit light;
a quantum dot color filter layer configured to convert a color of light emitted from the light source, the quantum dot color filter layer having a first refractive index;
a front substrate provided at a first side of the quantum dot color filter layer that is opposite to a second side of the quantum dot color filter layer at which the back light unit is provided, the front substrate having a second refractive index;
a low refractive layer provided between the quantum dot color filter layer and the front substrate, the low refractive layer having a third refractive index that is lower than the first refractive index of the quantum dot color filter layer; and
a cutoff layer disposed between the front substrate and the low refractive layer to cut off the light not converted by the quantum dot color filter layer,
wherein the third refractive index of the low refractive layer is lower than the second refractive index of the front substrate, and
wherein the second refractive index of the front substrate is higher than the first refractive index of the quantum dot color filter layer.

13. The display device of claim 12 , wherein the third refractive index of the low refractive layer falls within a range of between 1.0 and 1.4.

14. The display device of claim 12 , wherein the low refractive layer comprises a resin within which nano-particles are distributed, and wherein the nano-particles include at least one from among titanium dioxide (TiO 2 ) and zinc oxide (ZnO).

15. The display device of claim 12 , wherein the light emitted from the light source comprises blue light, and
wherein the display device further comprises a reflective layer provided between the quantum dot color filter layer and the back light unit, the reflective layer being configured for transmit the blue light therethrough and reflect light that has a wavelength longer than a wavelength of the blue light.

16. The display device of claim 12 , further comprising an anti-reflective (AR) layer coated on a surface of the front substrate and configured to prevent Fresnel reflection.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Kye Hoon

Classifications

• Y10S977/774

  Exhibiting three-dimensional carrier confinement, e.g. quantum dots · CPC title

• G02B5/28

  Interference filters · CPC title

• G02F1/133621

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

• G02F1/133553

  Reflecting elements (associated to illuminating devices G02F1/133605) · CPC title

• G02F1/133555

  Transflectors · CPC title