Patent ID: 6919947
Filing Date: 2005-07-19
Classification: G02F

Abstract:
1. A liquid crystal display comprising an input polarizer, an output polarizer, and a liquid crystal cell in between said input and output polarizers characterized by a twist angle, a cell thickness and a birefringence of the liquid crystal, such that: (a) the liquid crystal has a negative dielectric anisotropy, (b) the alignment of the liquid crystal in the zero volt state is substantially vertical and perpendicular to the liquid crystal cell, (c) the liquid crystal cell is treated such that there is a pretilt angle of the liquid crystal molecules near the cell surfaces away from the vertical direction, and thus has a vectorial component on the plane of the liquid crystal cell (the x-y plane), (d) the said pretilt angles of the liquid crystal molecules gives rise to a preferred twist angle of value φ, where φ can be any value, as viewed on the x-y plane, (e) the input polarizer angle α has a value of ξ−φ/2+Nπ/2 relative to the tilt direction of the input director of the said liquid crystal cell on the x-y plane, where ξ has a value of between 35° and 55° and N has a value of either −1, 0 or 1, (f) the output polarizer angle γ has a value of between α−10° and α+10° on the x-y plane, and (g) the product of the cell gap d and birefringence Δn has a value of between 1.0 and 2.2 microns.