Light control device, transparent display device including the same, and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10078240-B2
Application number	US-201615282566-A
Country	US
Kind code	B2
Filing date	Sep 30, 2016
Priority date	Sep 30, 2015
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

Discussed are a light control device, a transparent display device including the same, and a method of manufacturing the same, which lower a light transmittance in a light shield mode. The light control device may include a first substrate and a second substrate facing each other, a first electrode disposed on one surface of the first substrate facing the second substrate, a second electrode disposed on one surface of the second substrate facing the first substrate, a plurality of partition walls disposed on one surface of the first electrode facing the second substrate to maintain a gap between the first substrate and the second substrate, a first alignment layer disposed on the one surface of the first electrode and the plurality of partition walls, and a second alignment layer disposed on one surface of the second electrode facing the first substrate.

First claim

What is claimed is:

1. A light control device comprising:
a first substrate and a second substrate facing each other;
a first electrode on one surface of the first substrate facing the second substrate;
a second electrode on one surface of the second substrate facing the first substrate;
a plurality of partition walls on one surface of the first electrode facing the second substrate, the plurality of partition walls providing a gap between the first substrate and the second substrate; and
a plurality of liquid crystal cells each including liquid crystal, dichroic dyes, and ion materials,
wherein the plurality of liquid crystal cells are divided by the plurality of partition walls, and
when a voltage is not applied to the first electrode and the second electrode, the light control device operates in a transmissive mode, and
when the voltage is applied to the first electrode and the second electrode, the light control device operates in a light shield mode.

2. The light control device of claim 1 , further comprising:
a first alignment layer disposed on the one surface of the first electrode and the plurality of partition walls; and
a second alignment layer disposed on one surface of the second electrode facing the first substrate,
wherein:
the plurality of liquid crystal cells are disposed between the first alignment layer and the second alignment layer, and
when a voltage is not applied to the first electrode and the second electrode, a long-axis direction of each of the liquid crystal and the dichroic dyes is aligned in a vertical direction by the first alignment layer and the second alignment layer.

3. The light control device of claim 2 , further comprising an adhesive layer provided between the first and second alignment layers.

4. The light control device of claim 1 , further comprising:
a first alignment layer provided on the one surface of the first electrode and a side surface of each of the plurality of partition walls; and
a second alignment layer provided on one surface of the second electrode, the second alignment layer including an adhesive material.

5. The light control device of claim 4 , wherein the first and second alignment layers are adhered to each other on an upper portion of each of the plurality of partition walls.

6. The light control device of claim 5 , wherein the upper portion of each of the plurality of partition walls is partially inserted into the second alignment layer.

7. The light control device of claim 4 , wherein a thickness of the first alignment layer is thicker than a thickness of the second alignment layer.

8. The light control device of claim 4 , wherein hydrophobic processing is performed on one surface of the second alignment layer facing the first substrate.

9. The transparent display device of claim 8 , wherein:
the transparent display panel comprises a plurality of transmissive areas transmitting the incident light and a plurality of emissive areas emitting light,
the plurality of partition walls are disposed at respective positions corresponding to the plurality of emissive areas, and
the plurality of liquid crystal cells are disposed at respective positions corresponding to the plurality of transmissive areas.

10. The light control device of claim 4 , wherein the second alignment layer includes nano particles.

11. The light control device of claim 1 , wherein each of the plurality of liquid crystal cells further comprises a polymer network scattering incident light.

12. A transparent display device comprising:
a transparent display panel transmitting incident light or displaying an image; and
a light control device on one surface of the transparent display panel, the light control device performing a transmissive mode in which the incident light is transmitted, and a light shield mode in which the incident light is blocked,
wherein the light control device comprises:
a first substrate and a second substrate facing each other;
a first electrode on one surface of the first substrate facing the second substrate;
a second electrode on one surface of the second substrate facing the first substrate;
a plurality of partition walls on one surface of the first electrode facing the second substrate, the plurality of partition walls maintaining a gap between the first substrate and the second substrate; and
a plurality of liquid crystal cells each including liquid crystal, dichroic dyes, and ion materials.

13. The transparent display device of claim 12 , wherein the light control device further comprises:
a first alignment layer disposed on the one surface of the first electrode and the plurality of partition walls; and
a second alignment layer disposed on one surface of the second electrode facing the first substrate,
wherein:
the plurality of liquid crystal cells are disposed between the first alignment layer and the second alignment layer, and
when a voltage is not applied to the first electrode and the second electrode, a long-axis direction of each of the liquid crystal and the dichroic dyes is aligned in a vertical direction by the first alignment layer and the second alignment layer.

14. The transparent display device of claim 12 , wherein:
when a voltage is not applied to the first electrode and the second electrode, the light control device operates in the transmissive mode, and
when the voltage is applied to the first electrode and the second electrode, the light control device operates in the light shield mode.

15. The transparent display device of claim 12 , wherein the light control device further comprises:
a first alignment layer provided on the one surface of the first electrode and a side surface of each of the plurality of partition walls; and
a second alignment layer provided on one surface of the second electrode, the second alignment layer including an adhesive material.

16. The light control device of claim 15 , wherein the first and second alignment layers are adhered to each other on an upper portion of each of the plurality of partition walls.

17. The light control device of claim 16 , wherein the upper portion of each of the plurality of partition walls is partially inserted into the second alignment layer.

18. A light control device comprising:
a first substrate and a second substrate facing each other;
a first electrode on one surface of the first substrate facing the second substrate;
a second electrode on one surface of the second substrate facing the first substrate;
a plurality of partition walls on one surface of the first electrode facing the second substrate, the plurality of partition walls providing a gap between the first substrate and the second substrate;
a first alignment layer provided on the one surface of the first electrode and a side surface of each of the plurality of partition walls;
a second alignment layer provided on one surface of the second electrode, the second alignment layer including an adhesive material; and
a plurality of liquid crystal cells each including liquid crystal, dichroic dyes, and ion materials,
wherein the plurality of liquid crystal cells are divided by the plurality of partition walls.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Kihan
• Ahn Jiyoung
• Lee Moonsun
• Kim Jae-Hyun
• Park Sunyoung
• Ji Seokwon

Classifications

• G02F1/1334 Primary

  based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals · CPC title

• G02F1/13475

  in which at least one liquid crystal cell or layer is doped with a pleochroic dye, e.g. GH-LC cell (G02F1/13476 takes precedence) · CPC title

• G02F1/1337

  Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers · CPC title

• G02F2001/13345

  Physics · mapped topic

• G02F1/13471

  in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells (G02F1/13475 takes precedence) · CPC title