Optical laminate and sunroof including the same

Patent metadata

Field	Value
Publication number	US-2025208462-A1
Application number	US-202418984368-A
Country	US
Kind code	A1
Filing date	Dec 17, 2024
Priority date	Dec 21, 2023
Publication date	Jun 26, 2025
Grant date	—

Abstract

Disclosed is a transmittance variable optical laminate including: a light control laminate including an electric field-driven liquid crystal between polarizing plates; and a louver film disposed on at least a portion of the indoor-side surface of the light control laminate, wherein the louver film includes light-blocking patterns, wherein the light-blocking patterns are inclined at a predetermined angle with respect to an adherend surface when viewed in a vertical cross-section. Also, disclosed is a sunroof including the transmittance variable optical laminate.

First claim

What is claimed is:

1 . A transmittance variable optical laminate comprising:
a light control laminate comprising an electric field-driven liquid crystal between polarizing plates; and a louver film disposed on at least a portion of an indoor-side surface of the light control laminate, wherein the louver film comprises light-blocking patterns, wherein the light-blocking patterns are inclined at a predetermined angle with respect to an adherend surface when viewed in a vertical cross-section.

2 . The transmittance variable optical laminate of claim 1 , wherein a length (a) obtained by projecting an inclined surface of the light-blocking pattern onto the adherend surface when viewed in the vertical cross-section is 5 to 50% of a light-blocking portion (ω 1 ).

3 . The transmittance variable optical laminate of claim 1 , wherein the transmittance variable optical laminate has a maximum viewing angle ranging from 40° to 75° for reflected image, wherein the viewing angle (θ 1 ) for the reflected image is an angle of the reflected light with respect to a straight line perpendicular to the adherend surface toward the indoor side when viewed in the vertical cross-section of the transmittance variable optical laminate.

4 . The transmittance variable optical laminate of claim 1 , wherein the transmittance variable optical laminate has a maximum viewing angle (θ 2 ) ranging from 60° to 85° for external light transmitted from an outside, wherein the viewing angle (θ 2 ) for the external light is an angle of the external light with respect to a straight line perpendicular to the adherend surface toward the indoor side when viewed in the vertical cross-section of the transmittance variable optical laminate.

5 . The transmittance variable optical laminate of claim 1 , wherein the light-blocking pattern is composed of two or more unit patterns laminated to be at least partially misaligned.

6 . The transmittance variable optical laminate of claim 1 , wherein the louver film comprises: an inter-pattern spacing where the light-blocking pattern is not formed; and a light-blocking portion where the light-blocking pattern is formed,
wherein, assuming that a height of the light-blocking pattern is h, and the light-blocking portion is ω 1 , h/ω 1 is 0.5 to 4.0, and assuming that an inter-pattern spacing is ω 2 and a vertical light-transmitting portion is ω 3 , an aperture ratio (p) defined as ω 3 /(ω 2 +ω 1 )×100(%) with respect to a direction perpendicular to a plane is 70% or more.

7 . The transmittance variable optical laminate of claim 1 , wherein the light-blocking patterns protrude toward the indoor side.

8 . The transmittance variable optical laminate of claim 1 , wherein the light control laminate comprises:
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 may be formed in direct contact with any one of the first polarizing plate and the second polarizing plate.

9 . The transmittance variable optical laminate of claim 8 , wherein at least one of the first transparent conductive layer and the second transparent conductive layer comprises at least one selected from the group consisting of a transparent conductive oxide, a metal, a carbonaceous material, a conductive polymer, a conductive ink, and nanowires.

10 . The transmittance variable optical laminate of claim 8 , wherein at least one of the first polarizing plate and the second polarizing plate comprises at least one functional layer selected from the group consisting of a protective layer, a retardation matching layer, and a refractive index matching layer.

11 . The transmittance variable optical laminate of claim 8 , wherein at least one of the first polarizing plate and the second polarizing plate has a thickness of 30 μm to 200 μm.

12 . The transmittance variable optical laminate of claim 8 , wherein the liquid crystal layer comprises at least one spacer selected from the group consisting of a ball spacer and a column spacer.

13 . The transmittance variable optical laminate of claim 8 , wherein the light control laminate further comprises an alignment film on both surfaces of the liquid crystal layer.

14 . A sunroof comprising the transmittance variable optical laminate of claim 1 .

Assignees

• Dongwoo Fine Chem Co Ltd

Inventors

• Lim Geo-San
• Kim Dong-Hwi

Classifications

• G02F1/133567

  on the back side · CPC title

• B60J3/04

  adjustable in transparency · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02F1/1333

  Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence) · CPC title

• G02B1/11 Primary

  Anti-reflection coatings · CPC title