Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-10928678-B2
Application number	US-201816208571-A
Country	US
Kind code	B2
Filing date	Dec 4, 2018
Priority date	Dec 4, 2017
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A liquid crystal display device includes a light source member and a display panel disposed on the light source member. The display panel includes a first substrate and a second substrate facing each other, a liquid crystal layer, and a color conversion layer that is disposed between the liquid crystal layer and the first substrate. The color conversion layer includes a light emitter and a low refractive body having a refractive index of about 1.0 to about 1.3. The liquid crystal display device exhibits high color reproducibility and improves external light extraction efficiency.

First claim

What is claimed is:

1. A liquid crystal display device, comprising:
a light source member and a display panel disposed on the light source member, wherein the display panel includes:
a first substrate;
a second substrate facing the first substrate and disposed closer to the light source member than the first substrate;
a liquid crystal layer disposed between the first substrate and the second substrate; and
a color conversion layer disposed between the liquid crystal layer and the first substrate,
wherein the color conversion layer includes a first color conversion portion, a second color conversion portion, and a third color conversion portion that are spaced apart from one another on a plane,
wherein each of the first to third color conversion portions including a base resin, a high refractive material that is dispersed in the base resin, and a low refractive body dispersed in the base resin,
wherein the first color conversion portion includes a first quantum dot that is dispersed in the base resin, and the first quantum dot is configured to absorb a first color light provided from the light source member and emit a second color light that is different from the first color light,
wherein the second color conversion portion includes a second quantum dot that is dispersed in the base resin, and the second quantum dot is configured to absorb the first color light and emit a third color light that is different from the first color light and the second light color,
wherein the third color conversion portion does not include a light emitter, and the third color conversion portion is configured to transmit the first color light,
wherein the high refractive material is different from the first and second quantum dots, and the high refractive material comprises at least one of TiO2, TaO2, ZrO2, Fe2O3, Al2O3, ZnO, In2O3, SnO2, or Sb2O3, and
wherein the high refractive material has a refractive index of 1.7 to 3.5, and the low refractive body has a refractive index of 1.0 to 1.3.

2. The liquid crystal display device of claim 1 , wherein the low refractive body comprises at least one of hollow silica, aerogel, a porous inorganic particle including pores, and a porous organic particle including pores.

3. The liquid crystal display device of claim 1 , wherein the display panel further comprises a light blocking layer disposed between the color conversion layer and the first substrate and blocking blue light.

4. The liquid crystal display device of claim 3 , wherein the light blocking layer overlaps the first color conversion portion and the second color conversion portion and does not overlap the third color conversion portion.

5. The liquid crystal display device of claim 3 , wherein the light blocking layer is a yellow color filter layer.

6. The liquid crystal display device of claim 1 ,
wherein the color conversion layer further comprises a light blocking portion disposed between the first color conversion portion, the second color conversion portion, and the third color conversion portion that are spaced apart from one another.

7. The liquid crystal display device of claim 1 , wherein the light source member emits blue light, the first color conversion portion emits red light, and the second color conversion portion emits green light.

8. A liquid crystal display device, comprising:
a light source member and a display panel disposed on the light source member, wherein the display panel includes:
a first substrate;
a second substrate facing the first substrate and disposed closer to the light source member than the first substrate;
a liquid crystal layer disposed between the first substrate and the second substrate;
a polarizing layer disposed between the liquid crystal layer and the first substrate; and
a color conversion layer disposed between the liquid crystal layer and the first substrate and including a base resin, a high refractive material that is dispersed in the base resin, and a low refractive body that is dispersed in the base resin,
wherein the color conversion layer comprises:
a first color conversion portion including a first quantum dot, the high refractive material, and the low refractive body; and
a second color conversion portion including a second quantum dot, the high refractive material, and the low refractive body,

wherein the high refractive material is different from the first and second quantum dots, and the high refractive material comprises at least one of TiO2, TaO2, ZrO2, Fe2O3, Al2O3, ZnO, In2O3, SnO2, or Sb2O3, and
wherein the high refractive material has a refractive index of 1.7 to 3.5, and the low refractive body has a refractive index of 1.0 to 1.3.

9. The liquid crystal display device of claim 8 , wherein the color conversion layer further comprises:
a third color conversion portion including the high refractive material and the low refractive body excluding a light emitter,
wherein the first quantum dot is configured to absorb a first color light provided from the light source member and emit a second color light that is different from the first color light, and
wherein the second quantum dot is configured to absorb the first color light and emit a third color light that is different from the first color light and the second color light.

10. The liquid crystal display device of claim 8 , wherein the polarizing layer is disposed between the liquid crystal layer and the color conversion layer.

11. A liquid crystal display device, comprising:
a light source member configured to emit blue light; and
a display panel disposed on the light source member and including a red pixel area, a green pixel area, and a blue pixel area, wherein the display panel includes:
a first substrate;
a second display substrate facing the first substrate and disposed closer to the light source than the first substrate;
a liquid crystal layer disposed between the first substrate and the second substrate; and
a color conversion layer disposed between the liquid crystal layer and the first substrate, wherein the color conversion layer includes:
a first color conversion portion disposed corresponding to the red pixel area and including a first quantum dot that is configured to absorb the blue light and emit red light;
a second color conversion portion disposed corresponding to the green pixel area and including a second quantum dot that is configured to absorb the blue light and emit green light; and
a third color conversion portion disposed corresponding to the blue pixel area and configured to transmit the blue light, and the third color conversion portion does not include a light emitter,
wherein each of the first to third color conversion portions includes a base resin, a high refractive material that is dispersed in the base resin, and a low refractive body that is dispersed in the base resin,
wherein the high refractive material is different from the first and second quantum dots, and the high refractive material comprises at least one of TiO2, TaO2, ZrO2, Fe2O3, Al2O3, ZnO, In2O3, SnO2, or Sb2O3, and
wherein the high refractive material has a refractive index of 1.7 to 3.5, and the low refractive body has a refractive index of 1.0 to 1.3.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Kwangkeun
• Kim Youngmin
• Park Haeil
• Baek Moonjung
• Yoon Seon-Tae
• Jo Kunhee

Classifications

• G02F1/133514 Primary

  Colour filters · CPC title

• G02F2202/13

  photorefractive · CPC title

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02F1/133617 Primary

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