Patent ID: 7088411
Filing Date: 2006-08-08
Classification: G02B,G02F

Abstract:
1. A liquid crystal display, comprising: a first o-plate having a first azimuthal orientation specified by a projection of a vector defined by an azimuthal orientation of an optical axis and a direction of its tilt into the first o-plate plane, a first c-plate; a liquid crystal cell comprising a rear surface and a front surface, wherein the liquid crystals at the rear surface have a second azimuthal orientation and the liquid crystals at the front surface have a third azimuthal orientation and wherein the fast c-plate is disposed between the first o-plate and the liquid crystal cell, a second c-plate; and a second o-plate having a fourth azimuthal orientation, wherein the second c-plate is disposed between the second o-plate and the liquid crystal cell, wherein the first, second, third and fourth azimuthal orientations are disposed in a helical arrangement, wherein the second azimuthal orientation differs from the first azimuthal orientation by an angle in the range of 75 to 105 degrees in a first rotational direction, the third azimuthal orientation differs from the second azimuthal orientation by an angle in the range of 75 to 105 degrees in the first rotational direction, and the fourth azimuthal orientation differs from the third azimuthal orientation by an angle in the range of 75 to 105 degrees in the first rotational direction wherein the azimuthal orientation of each o-plate is specified by the projection of the layer's average optical axis vector onto the plane, with the average optical axis vector having θ>0, with the z-axis pointing toward the front of the device, and wherein the azimuthal orientation of the liquid crystal at each surface is specified by the projection of its director onto the surface, with the director having θ>0, with the z-axis pointing toward the front of the device.