Optical laminate and manufacturing method therefor, smart window comprising same, and vehicle and building window or door employing same

Patent metadata

Field	Value
Publication number	US-2024248343-A1
Application number	US-202218293036-A
Country	US
Kind code	A1
Filing date	Aug 10, 2022
Priority date	Aug 24, 2021
Publication date	Jul 25, 2024
Grant date	—

Abstract

The present invention relates to a transmittance-variable optical laminate and a manufacturing method therefor, a smart window comprising same, and a vehicle and a building window or door employing same, the optical laminate comprising: a first polarizing plate; a first transparent conductive layer formed on one surface of the first polarizing plate; 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; and a liquid crystal layer provided between the first transparent conductive layer and the second transparent conductive layer, wherein at least one of the first transparent conductive layer and the second transparent conductive layer is formed to come into direct contact with one of the first polarizing plate and the second polarizing plate, and at least one of the first polarizing plate and the second polarizing plate comprises a reflective polarizing plate.

First claim

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 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; and a liquid crystal layer provided between the first transparent conductive layer and the second transparent conductive layer, 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, and at least one polarizing plate of the first polarizing plate and the second polarizing plate comprises a reflective polarizing plate.

2 . The variable transmittance optical stack of claim 1 , wherein the first polarizing plate and the second polarizing plate comprise a reflective polarizing plate.

3 . The variable transmittance optical stack of claim 1 , wherein at least one polarizing plate of the first polarizing plate and the second polarizing plate has a multi-layered structure comprising an absorptive polarizing plate and a reflective polarizing plate.

4 . The variable transmittance optical stack of claim 1 , wherein a transmission axis of the first polarizing plate and a transmission axis of the second polarizing plate are perpendicular to each other.

5 . 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.

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

7 . 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 a separate or additional substance between the polarizing plate and the transparent conductive layer.

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 with a highly adhesive layer 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 comprises one or more types selected from a group consisting of transparent conductive oxide, metal, carbonaceous material, conductive polymers, conductive ink, and nanowires.

10 . The variable transmittance optical stack of claim 1 , wherein the liquid crystal layer is driven in a twisted nematic mode.

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

12 . The variable transmittance optical stack of claim 11 , wherein the ball spacer has a diameter ranged from 1 to 10 μm.

13 . The variable transmittance optical stack of claim 11 , wherein an occupancy area of the ball spacer in the liquid crystal layer is ranged from 0.01 to 10% of the area of the liquid crystal layer.

14 . The variable transmittance optical stack of claim 1 , wherein the variable transmittance optical stack comprises one or more types selected from a group consisting of an alignment film, a pressure sensitive adhesive/adhesive layer, an ultraviolet ray absorption layer, and a hard coating layer.

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

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

17 . A vehicle in which the smart window of claim 16 is applied to at least one of a front window, a rear window, a side window, a sunroof window, and an inner partition thereof.

18 . A window and a door for a building, the window and the door comprising the smart window of claim 16 .

Assignees

• Dongwoo Fine Chem Co Ltd

Inventors

• Kim Dong-Hwi
• Kim Sung-Su
• Lee Seung-Sin

Classifications

• E06B2009/2464

  featuring transparency control by applying voltage, e.g. LCD, electrochromic panels · CPC title

• E06B9/24

  Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; {Slat blinds}(operating, guiding or securing devices or arrangements for roll-type closures E06B9/56; free-hanging flexible screens A47H23/00) · CPC title

• G02F1/13392

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

• B60J3/007

  Sunglare reduction by coatings, interposed foils in laminar windows, or permanent screens (layered glass products B32B17/00; process of coating windows C03C17/00) · CPC title

• G02F1/13398

  Spacer materials; Spacer properties · CPC title