Light control sheet

Patent metadata

Field	Value
Publication number	US-12455471-B2
Application number	US-202318309959-A
Country	US
Kind code	B2
Filing date	May 1, 2023
Priority date	Nov 13, 2020
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

A light control sheet including a first transparent electrode layer, a second transparent electrode layer, a light control layer formed between the first transparent electrode layer and the second transparent electrode layer, the light control layer including a transparent polymer layer having voids filled with a liquid crystal composition including liquid crystal molecules, and spacers formed in the light control layer and including polymethyl methacrylate.

First claim

What is claimed is:

1. A light control sheet, comprising:
a first transparent substrate;
a second transparent substrate facing the first transparent substrate;
a first transparent electrode layer formed on the first transparent substrate;
a second transparent electrode layer formed on the second transparent substrate;
a light control layer formed between the first transparent electrode layer formed on the first transparent substrate and the second transparent electrode layer formed on the second transparent substrate; and
a plurality of spacers formed in the light control layer and comprising polymethyl methacrylate such that the spacers are dispersed in the light control layer between the first transparent electrode layer and the second transparent electrode layer,
wherein
the light control layer includes a transparent polymer layer forming a polymer network such that the transparent polymer layer has voids formed in the polymer network and a liquid crystal composition including liquid crystal molecules filling the voids in the polymer network,
the polymer network of the transparent polymer layer in the light control layer has a three-dimensional mesh shape and comprises a polymer in which plural types of unit structures have been polymerized,
the unit structures include a unit structure comprising an aromatic ring, and
an average number of the aromatic ring in the unit structures in the transparent polymer layer is 0.4 or more per unit structure.

2. The light control sheet according to claim 1 , wherein an absolute value of a difference between a refractive index of the transparent polymer layer and a refractive index of the spacers is 0.04 or less.

3. The light control sheet according to claim 2 , wherein the transparent polymer layer has a three-dimensional mesh shape.

4. The light control sheet according to claim 2 , wherein the plurality of spacers includes a plurality of particulate spacers.

5. The light control sheet according to claim 2 , wherein the plurality of spacers includes a plurality of particulate spacers having a diameter substantially equal to a thickness of the light control layer.

6. The light control sheet according to claim 1 , wherein the transparent polymer layer has a three-dimensional mesh shape.

7. The light control sheet according to claim 6 , wherein an absolute value of a difference between a refractive index of the transparent polymer layer and a refractive index of the spacers is 0.09 or less.

8. The light control sheet according to claim 6 , wherein an absolute value of a difference between a refractive index of the transparent polymer layer and a refractive index of the spacers is 0.05 or less.

9. The light control sheet according to claim 1 , wherein the plurality of spacers includes a plurality of particulate spacers.

10. The light control sheet according to claim 1 , wherein the plurality of spacers includes a plurality of particulate spacers having a diameter substantially equal to a thickness of the light control layer.

11. The light control sheet according to claim 1 , wherein an absolute value of a difference between a refractive index of the transparent polymer layer and a refractive index of the spacers is 0.09 or less.

12. The light control sheet according to claim 1 , wherein an absolute value of a difference between a refractive index of the transparent polymer layer and a refractive index of the spacers is 0.05 or less.

13. The light control sheet according to claim 1 , wherein an absolute value of a difference between a refractive index of the transparent polymer layer and a refractive index of the spacers is 0.01 or less.

14. The light control sheet according to claim 1 , wherein each of the first and second transparent substrates comprises transparent synthetic resin.

Assignees

• Toppan Inc

Inventors

• Enya Taisuke

Classifications

• G02F1/13392

  spacers dispersed on the cell substrate, e.g. spherical particles, microfibres · CPC title

• G02F1/133365

  Cells in which the active layer comprises a liquid crystalline polymer · CPC title

• G02F1/13775

  Polymer-stabilized liquid crystal layers · CPC title

• G02F1/13439

  characterised by their electrical, optical, physical properties; materials therefor; method of making · CPC title

• G02F1/133502

  Antiglare, refractive index matching layers · CPC title