Patent ID: 7253860

Claim:
A wide viewing angle liquid crystal display, comprising: a back light unit; an optical compensation circular polarizer unit disposed over the back light unit; an optically self-compensated birefringence liquid crystal panel disposed over the optical compensation circular polarizer unit; and an optical compensation circular analyzer unit disposed over the optically self-compensated birefringence liquid crystal panel, and the optical compensation circular analyzer unit comprising; an analyzer plate, wherein the absorption axis of the analyzer plate is perpendicular to the absorption axis of the polarizer plate, and the polarizer plate form an included angle of between 40° to 50° with the alignment direction of the liquid crystal panel; a second uniaxial quarter-wave plate sandwiched between the analyzer plate and the optically self-compensated birefringence liquid crystal panel, wherein the optical axis of the second uniaxial quarter-wave plate forms an included angle of about 45° with the absorption axis of the analyzer plate; and a second biaxial compensation film sandwiched between the second uniaxial quarter-wave plate and the optically self-compensated birefringence liquid crystal panel, wherein the second biaxial compensation film hasprincipal refractive indices nx′, ny′ and nz′ that satisfy the following inequality relations: nx′>ny′>nz′ and 4>(nx′−nz′)/(nx′−ny′)>2, and the principal axis with the refractive index nx′ is perpendicular to the alignment direction of the liquid crystal panel.