Patent ID: 7126659
Filing Date: 2006-10-24
Classification: G02F

Abstract:
1. A liquid crystal display device comprising: a liquid crystal display cell having a lower substrate, an upper substrate which constitutes an observation side, a liquid crystal layer sandwiched between the lower substrate and the upper substrate, a lower orientation film which is formed over a surface of the lower substrate which is brought into contact with the liquid crystal layer, and an upper orientation film formed over a surface of the upper substrate which is brought into contact with the liquid crystal layer; an upper polarizer arranged at a side of the upper substrate opposite to the liquid crystal layer; an upper λ/2 phase difference plate arranged between the upper polarizer and the upper substrate; an upper λ/4 phase difference plate arranged between the upper λ/2 phase difference plate and the upper substrate; a lower polarizer arranged at a side of the lower substrate opposite to the liquid crystal layer; a lower λ/2 phase difference plate arranged between the lower polarizer and the lower substrate; a lower λ/4 phase difference plate arranged between the lower λ/2 phase difference plate and the lower substrate; and an optical film having negative uniaxial double refractive index ellipsoids arranged between the lower λ/4 phase difference plate and the lower substrate, wherein a twist angle of the liquid crystal layer is larger than 0° and equal to or smaller than 90°, the orientation axis direction of the optical film having negative uniaxial double refractive index ellipsoids is arranged within a range of −5° to +5° with respect to the direction which is rotated by 90° in the clockwise direction from a resultant vector of the orientation axis direction of the upper orientation film and the orientation axis direction of the lower orientation film of the liquid crystal display cell, and a phase lagging axis of the lower λ/4 phase difference plate is arranged within a range of −10° to +10° with respect to the orientation axis direction of the optical film having negative uniaxial double refractive index ellipsoids, and a phase lagging axis of the upper λ/4 phase difference plate is arranged within a range of −5° to +5° with respect to the direction which is rotated 90° in the clockwise direction from a resultant vector of the orientation axis direction of the upper orientation film and the orientation axis direction of the lower orientation film of the liquid crystal display cell.