Optical device
An optical device is provided in the present application. The present application provides an optical device capable of varying transmittance, and such 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:
first and second outer substrates disposed to face each other; and
an active liquid crystal element encapsulated between the first and second outer substrates,
wherein at least one of the first or second outer substrates is a curved substrate, wherein the active liquid crystal element comprises two base films disposed opposite to each other and an active liquid crystal layer between the two base films,
wherein the active liquid crystal element is encapsulated with an adhesive film, wherein the adhesive film is disposed at least between the active liquid crystal element and the first or the second outer substrate,
wherein a thickness at a center of gravity of the optical device is thinner than a thickness of a rim of the optical device at its rim,
wherein the first outer substrate and the second outer substrate are bent in the same direction at the rim,
wherein a thickness of each of the first and second outer substrates is 1 mm or more and a curvature radius of each of the first and second outer substrates is 2,000R or less.
2. The optical device according to claim 1 , wherein the first and second outer substrates are both curved substrates.
3. The optical device according to claim 2 , wherein curvature centers of the first and second outer substrates are present in the same portion of an upper part or a lower part of the first and second outer substrates.
4. The optical device according to claim 1 , wherein a difference between curvature radii of the first and second outer substrates is within 10%.
5. The optical device according to claim 1 , wherein curvatures of the first and second outer substrates are different from each other.
6. The optical device according to claim 1 , wherein the curvature radius is from 100R to 2,000R.
7. The optical device according to claim 1 , wherein, among the first and the second outer substrates, one of outer substrates that exists at an upper position in a direction along a convex direction formed by the curved substrate has a larger curvature radius than the other outer substrate that exists at a lower position in a direction along the convex direction formed by the curved substrate.
8. The optical device according to claim 1 , wherein the first or the second outer substrate is a glass substrate.
9. The optical device according to claim 1 , wherein a thickness difference between the thickness at the center of gravity and the thickness at the rim is 0.5% or more.
10. The optical device according to claim 1 , further comprising a polarizer encapsulated between the first and second outer substrates.
11. The liquid crystal display device according to claim 10 , wherein the active liquid crystal element and the polarizer are encapsulated with the adhesive film existing between the outer substrate and the active liquid crystal element, between the active liquid crystal element and the polarizer, between the polarizer and the outer substrate, and on sides of the active liquid crystal element and the polarizer.
12. A method of manufacturing the optical device of claim 1 comprising:
encapsulating the active liquid crystal element between the first and second outer substrates disposed opposite to each other through an autoclave process using the adhesive film,
wherein both of the first or second outer substrates are curved substrates,
wherein the active liquid crystal element comprises the two base films disposed opposite to each other and the active liquid crystal layer is between the two base films, and
wherein the adhesive film is disposed at least between the active liquid crystal element and the first or the second outer substrates, wherein the first and second outer substrates are disposed such that their curvature centers are present in the same portion among an upper part or a lower part of the first and second outer substrates,
wherein the first and second outer substrates are disposed such that the first outer substrate disposed at an upper position in a direction along a convex direction formed by the curved substrates has a larger curvature radius than the second outer substrate at a lower position in a direction along the convex direction formed by the curved substrate,
wherein a difference in curvatures or curvature radii of the first and the second outer substrate is from 1.5% to 10%
wherein a thickness of each of the first and second outer substrates is 1 mm or more and a curvature radius of each of the first and second outer substrates is 2,000R or less.
13. An automobile comprising a body on which one or more openings are formed; and the optical device of claim 1 attached to the openings.
14. An optical device, comprising:
first and second outer substrates disposed to face each other; and
an active liquid crystal element encapsulated between the first and second outer substrates,
wherein at least one of the first and second outer substrates is a curved substrate,
wherein the active liquid crystal element comprises two base films disposed opposite to each other and an active liquid crystal layer between the two base films,
wherein the active liquid crystal element is encapsulated with an adhesive film,
wherein the adhesive film is at least between the active liquid crystal element and the first or the second outer substrate,
wherein a thickness of the optical device at its center of gravity is thinner than a thickness of the optical device at its rim,
wherein the first and second outer substrates are bent in the same direction at the rim, and
wherein a thickness of each of the first and second outer substrates is 2 mm or more and a curvature radius of each of the first and second outer substrates is 3,000R or less.