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US 10,768,461 B2Granted
Light modulation device
AssigneeLG Chem, Ltd.
InventorsHyun Jun Lee, Eun Jung Lim, Jung Sun You, Min Jun Gim, Dong Hyun Oh, Jin Hong Kim
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Abstract
The present application relates to a light modulation device and a use thereof. The present application can provide a light modulation device having both excellent mechanical properties and optical properties by applying a polymer film that is also optically anisotropic and mechanically anisotropic to a substrate.
Claims12
A light modulation device comprising:
- a first polymer film substrate and second polymer film substrate disposed opposite to each other, and
- an active liquid crystal film layer having an active liquid crystal layer which is disposed between the first polymer film substrate and the second polymer film substrate,
- wherein the active liquid crystal film layer contains a liquid crystal host and a dichroic dye guest,
- wherein the active liquid crystal layer is configured to switch between a horizontal orientation state and a vertical orientation state,
- each of the first polymer film substrate and the second polymer film substrate has an in-plane retardation of 4,000 nm or more for light having a wavelength of 550 nm,
- each of the polymer film substrates has a ratio (E1/E2) of an elongation (E1) in a first direction to an elongation (E2) in a second direction perpendicular to the first direction of 3 or more, and
- the first polymer film substrate and the second polymer film substrate are disposed so that an angle formed by the first direction of the first polymer film substrate and the first direction of the second polymer film substrate is in a range of 0 degrees to 10 degrees.
4 more elements
Dependencies are inferred from the claim text.