Optical stack, and manufacturing method for same, and smart window including same, and automobile or windows for building using same

Patent metadata

Field	Value
Publication number	US-2024288729-A1
Application number	US-202418416438-A
Country	US
Kind code	A1
Filing date	Jan 18, 2024
Priority date	Feb 28, 2023
Publication date	Aug 29, 2024
Grant date	—

Abstract

A variable transmittance optical stack, a manufacturing method therefor, a smart window including the same, and windows for an automobile or a building using the same are proposed.

First claim

What is claimed is:

1 . A variable transmittance optical stack comprising:
a first polarizing plate; a first transparent conductive layer formed on one surface of the first polarizing plate; a first alignment film formed on the first transparent conductive layer; a second polarizing plate opposite to the first polarizing plate; a second transparent conductive layer formed on one surface of the second polarizing plate, and opposite to the first transparent conductive layer; a second alignment film formed on the second transparent conductive layer; and a liquid crystal layer provided between the first alignment film and the second alignment film, wherein the liquid crystal layer contains a polymer network and a liquid crystal compound, and the liquid crystal compound is arranged with uniform initial alignment.

2 . The variable transmittance optical stack of claim 1 , wherein a liquid crystal operating method of the liquid crystal layer is any one selected from a group consisting of a twisted nematic mode, a super twisted nematic mode, an in-plane switching mode, a fringe-field mode, and a vertical alignment mode.

3 . The variable transmittance optical stack of claim 2 , wherein the liquid crystal operating method of the liquid crystal layer is the twisted nematic mode.

4 . The variable transmittance optical stack of claim 1 , wherein the liquid crystal layer contains a cured product of a composition for forming the liquid crystal layer, which contains a polymerizable monomer and a liquid crystal compound.

5 . The variable transmittance optical stack of claim 4 , wherein the composition for forming the liquid crystal layer contains 10 to 30% by weight of the polymerizable monomer with respect to the total weight of the composition.

6 . The variable transmittance optical stack of claim 1 , wherein the first alignment film and the second alignment film are aligned by a rubbing manner.

7 . The variable transmittance optical stack of claim 1 , wherein each of the first transparent conductive layer and the second transparent conductive layer contains one or more types selected from a group consisting of transparent conductive oxide, metal, carbonaceous material, conductive polymers, conductive ink, and nanowires.

8 . The variable transmittance optical stack of claim 1 , wherein at least one transparent conductive layer of the first transparent conductive layer and the second transparent conductive layer is formed by directly contacting with any one polarizing plate of the first polarizing plate and the second polarizing plate without an additional substrate between the polarizing plate and the transparent conductive layer.

9 . The variable transmittance optical stack of claim 1 , wherein at least one transparent conductive layer of the first transparent conductive layer and the second transparent conductive layer is formed by directly contacting with any one polarizing plate of the first polarizing plate and the second polarizing plate with a highly adhesive layer between the polarizing plate and the transparent conductive layer.

10 . The variable transmittance optical stack of claim 1 , wherein at least one polarizing plate of the first polarizing plate and the second polarizing plate comprises one or more types of functional layers selected from a group consisting of a protective layer, a retardation matching layer, and a refractive index-matching layer.

11 . The variable transmittance optical stack of claim 1 , wherein each of the first polarizing plate and the second polarizing plate has a thickness ranged from 30 μm to 200 μm.

12 . The variable transmittance optical stack of claim 1 , further comprising:
one or more types selected from a group consisting of a pressure sensitive adhesive/adhesive layer, an ultraviolet ray absorption layer, and a hard coating layer.

13 . A manufacturing method for the variable transmittance optical stack of claim 1 .

14 . A smart window comprising the variable transmittance optical stack of claim 1 .

Assignees

• Dongwoo Fine Chem Co Ltd

Inventors

• Kim Hyun-Seong
• Kim Jin-Ho
• Ryu Hyun-Sun
• Choi Ju-Seob

Classifications

• G02F1/1396

  the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell (G02F1/141 takes precedence) · CPC title

• G02F1/1397

  the twist being substantially higher than 90°, e.g. STN-, SBE-, OMI-LC cells · CPC title

• G02F1/133784

  by rubbing · CPC title

• G02F1/133528 Primary

  Polarisers · CPC title

• G02F1/13345 Primary

  Network or three-dimensional gels · CPC title