LCD device implementing FLCP orientation film
View Patent ↗A liquid crystal display device having first and second substrates with an interposed liquid crystal layer that has a negative or a positive dielectric anisotropy. First and second electrodes are formed on opposing surfaces of the first and second substrates. A first orientation film comprised of a ferroelectric liquid crystal polymer is formed on the first electrode, and a second orientation film is formed on the second electrode. First and second polarizers are formed on exterior surfaces of the first and second substrates.
1. A liquid crystal display device comprising:
a first substrate having a first electrode and a first orientation film on the first electrode;
a second substrate having a second electrode and a second orientation film on the second electrode; and
a nematic liquid crystal layer between the first and second substrates,
wherein said first orientation film includes a ferroelectric liquid crystal polymer.
2. A liquid crystal display device according to claim 1 , wherein the second orientation film includes a homogeneous alignment film.
3. A liquid crystal display device according to claim 1 , wherein the liquid crystal layer has a positive dielectric anisotropy.
4. A liquid crystal display device according to claim 1 , wherein the liquid crystal layer has a negative dielectric anisotropy.
5. A liquid crystal display device according to claim 1 , wherein the liquid crystal layer includes a chiral dopant.
6. A liquid crystal display device according to claim 1 , wherein the liquid crystal layer includes a twist nematic liquid crystal layer.
7. A liquid crystal display device according to claim 6 , wherein a twist angle of the twist nematic liquid crystal layer is at least 90 degrees.
8. A liquid crystal display device according to claim 1 , further including a first polarizer on said first substrate.
9. A liquid crystal display device according to claim 8 , further including a second polarizer on said second substrate.
10. A liquid crystal display device according to claim 8 , wherein said first polarizer has a polarization axis perpendicular to an alignment direction of said first orientation film.
11. A liquid crystal display device according to claim 8 , wherein said second polarizer has a polarizing axis parallel to an alignment direction of said second orientation film.
12. A method for fabrication a liquid crystal display device, comprising:
forming first and second electrodes on first and second substrates;
forming a first orientation film having a ferroelectric liquid crystal polymer on the first electrode;
forming a second orientation film on the second electrode; and
forming a nematic liquid crystal layer between the first and second substrates.
13. A method for fabrication a liquid crystal display device according to claim 12 , wherein the second orientation film includes a homogeneous alignment film.
14. A method for fabrication a liquid crystal display device according to claim 12 , further comprising forming first and second polarizers on surfaces of the first and second substrates.
15. A method for fabrication a liquid crystal display device according to claim 14 , wherein a polarizing axis of the first polarizer is perpendicular to an alignment direction of the first orientation film.
16. A method for fabrication a liquid crystal display device according to claim 14 , wherein a polarizing axis of the second polarizer is parallel with an alignment direction of the second orientation film.
17. A method for fabrication a liquid crystal display device according to claim 12 , wherein the liquid crystal layer is twisted by an applied electric field.