Transmittance-variable optical laminate and manufacturing method therefor, and smart window comprising same

Patent metadata

Field	Value
Publication number	US-2025370297-A1
Application number	US-202318870254-A
Country	US
Kind code	A1
Filing date	Apr 20, 2023
Priority date	May 31, 2022
Publication date	Dec 4, 2025
Grant date	—

Abstract

The present invention relates to a transmittance-variable optical laminate and a manufacture method therefor, and a smart window comprising same, the laminate including: a first laminate in which a first polarization plate, a first transparent conductive layer, and a first alignment film are sequentially laminated; a second laminate in which a second polarization plate, a second transparent conductive layer, and a second alignment are sequentially laminated; and a dispersion liquid crystal disposed between the first laminate and the second laminate, wherein the dispersion liquid crystal includes a spacer, a compressive modulus of the spacer to a compressive modulus of one of the first laminate and the second laminate is 0.75 to 1.55, and the spacer is included in an amount of 0.5 to 3.0% by weight based on the total weight of the dispersion liquid crystal.

First claim

1 . A variable transmittance optical stack comprising:
a first stack comprising a first polarizing plate, a first transparent conductive layer, and a first alignment film stacked in order; a second stack comprising a second polarizing plate, a second transparent conductive layer, and a second alignment film stacked in order; and a dispersion liquid crystal disposed between the first stack and the second stack, wherein the dispersion liquid crystal comprises a spacer, a compressive modulus of the spacer to a compressive modulus of at least one of a group consisting of the first stack and the second stack is 0.75 to 1.55, and the spacer is included in an amount of 0.5 to 3.0% by weight based on the total weight of the dispersion liquid crystal.

2 . The variable transmittance optical stack of claim 1 , wherein a compressive modulus of one selected from a group consisting of the first stack and the second stack ranges from 3,000 to 4,000 Mpa.

3 . The variable transmittance optical stack of claim 1 , wherein a compressive modulus of the spacer ranges from 2,000 to 5,500 Mpa.

4 . The variable transmittance optical stack of claim 1 , wherein the spacer comprises one or more types selected from a group consisting of a ball spacer and a column spacer.

5 . The variable transmittance optical stack of claim 1 , wherein at least one of the first and second transparent conductive layers is formed by directly contacting with one of the first and second polarizing plates.

6 . The variable transmittance optical stack of claim 1 , wherein at least one of the first and second transparent conductive layers comprises one or more types selected from a group consisting of transparent conductive oxide, metal, carbonaceous matter, conductive polymers, conductive ink, and nanowires.

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

8 . The variable transmittance optical stack of claim 1 , wherein at least one of the first and second polarizing plates has a thickness ranging from 30 to 200 μm.

9 . The variable transmittance optical stack of claim 1 , further comprising:
a sealant disposed between the first stack and the second stack.

10 . The variable transmittance optical stack of claim 1 , wherein the variable transmittance optical stack further comprises one or more types selected from a group consisting of a pressure sensitive adhesive/adhesive layer, an ultraviolet ray absorption layer, and an impact resistance layer.

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

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

13 . A means of transport comprising the smart window of claim 12 .

14 . A vehicle in which the smart window of claim 12 is applied to at least one selected from a group consisting of a front window, a rear window, a side window, a sunroof window, and an inner partition.

15 . A wearable device comprising the smart window of claim 12 .

16 . Windows for a building comprising the smart window of claim 12 .

Assignees

• Dongwoo Fine Chem Co Ltd

Inventors

• Kim Hyung-Hun
• Kim Dong-Hwi
• Song Seung-Won

Classifications

• G02F1/133528

  Polarisers · CPC title

• G02F1/13396

  Spacers having different sizes · CPC title

• G02F1/1337 Primary

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

• G06F1/163

  Wearable computers, e.g. on a belt · CPC title

• B60J3/04 Primary

  adjustable in transparency · CPC title