Optical device with active liquid crystal element film having folded shape
The present application relates to an optical device. The present application provides an optical device capable of varying transmittance, and such an optical device can be used for various applications such as eyewear, for example, sunglasses or AR (augmented reality) or VR (virtual reality) eyewear, an outer wall of a building or a sunroof for a vehicle.
1. An optical device, comprising:
an active liquid crystal element film having an active liquid crystal layer, wherein the active liquid crystal layer contains a liquid crystal compound and is capable of switching between a first oriented state and a second oriented state,
wherein the active liquid crystal element film is in a folded shape,
wherein the folded shape has a first portion, a second portion, a first folded portion at an intersection between the first portion and the second portion, and a second folded portion contained in the second portion,
wherein the first portion, the second portion, the first folded portion, and the second folded portion are not moveable relative to each other,
wherein the first portion has a vertical axis bisecting the first portion,
wherein the first folded portion folds toward the vertical axis and the second folded portion folds away from the vertical axis,
wherein the first portion has a curvature in a range of 0 to 0.01, wherein the curvature is 1/curvature radius, and
wherein a folded angle, which is an angle defined at the intersection between the first portion and the second portion of the active liquid crystal element film, exceeds 0 degrees and is 120 degrees or less.
2. The optical device according to claim 1 , wherein the folded angle is 5 degrees or more and is 120 degrees or less.
3. The optical device according to claim 1 , wherein the folded angle is 10 degrees or more and is 120 degrees or less.
4. The optical device according to claim 1 , wherein the folded angle is 15 degrees or more and is 120 degrees or less.
5. The optical device according to claim 1 , wherein the second portion of the folded shape is two second portions, and wherein the two second portions are at opposing ends of the first portion.
6. The optical device according to claim 1 , wherein the active liquid crystal element film further comprises:
two base films,
wherein the active liquid crystal layer is disposed between the two base films.
7. The optical device according to claim 6 , further comprising:
a sealant, wherein the sealant is disposed along the first portion of the folded shape, and attaches the two base films to each other.
8. The optical device according to claim 1 , further comprising:
a polarizer.
9. The optical device according to claim 8 , wherein the active liquid crystal element film and the polarizer are disposed such that an angle formed by an average optical axis of the active liquid crystal layer in the first oriented state and a light absorption axis of the polarizer is in a range of 80 degrees to 100 degrees, or in a range of 35 degrees to 55 degrees.
10. The optical device according to claim 6 , wherein each of the two base films has a coefficient of thermal expansion of 100 ppm/K or less.
11. The optical device according to claim 1 , further comprising:
two outer substrates; and
an adhesive film, wherein the active liquid crystal element film is encapsulated by the adhesive film, and wherein the encapsulated active liquid crystal element film is disposed between the two outer substrates.
12. The optical device according to claim 11 , wherein a friction coefficient between a surface of the active liquid crystal element film and a surface of the adhesive film is 5 or less.
13. An automobile, comprising:
a body;
one or more openings disposed in the body; and
the optical device of claim 1 attached to the one or more openings.
14. An optical device, comprising:
an active liquid crystal element film having an active liquid crystal layer, wherein the active liquid crystal layer contains a liquid crystal compound and is capable of switching between a first oriented state and a second oriented state,
wherein the active liquid crystal element film is in a folded shape,
wherein the folded shape has a first portion, two second portions at opposing ends of the first portion, two first folded portions at intersections between the first portion and the two second portions, and two second folded portions where one second folded portion is contained in each second portion,
wherein the first portion has a vertical axis bisecting the first portion,
wherein the first folded portions fold toward the vertical axis and the second folded portions fold away from the vertical axis,
wherein the two second portions, the first portion, the two first folded portions, and the two second folded portions are not moveable relative to each other, and
wherein a folded angle, which is an angle defined at the intersections between the first portion and the two second portions, exceeds 0 degrees and is 120 degrees or less.