Patent ID: 7508472

Claim:
A liquid crystal display, comprising: a liquid crystal cell comprising a first substrate, a second substrate, and a liquid crystal layer interposed therebetween, and the liquid crystal cell having a twisted angle φ and a half residual phase α depending on an external electric field, wherein the liquid crystal layer comprises a middle layer, a first boundary layer sandwiched between the middle layer and the first substrate, and a second boundary layer sandwiched between the middle layer and the second substrate; a compensation film disposed on the liquid crystal cell, and having a phase retardation δ in the range of (δ 0 −0.2π)≦δ≦(δ 0 +0.2π) and a slow axis angle θ in the range of 0°≦θ≦180°; and a polarizer disposed on the compensation film and on an ambient light entrance side and having a polarizer angle β in the range of (β 0 −20°+n·90°)≦β≦(β 0 +20°+n·90°); wherein the compensation film is sandwiched between the polarizer and the liquid crystal cell, wherein the phase retardation δ 0 satisfies the following relation: δ 0 = atan ⁡ ( sin 2 ⁢ ϕ + cos ⁢ ⁢ 2 ⁢ αcos 2 ⁢ ϕ sin ⁢ ⁢ αsin2θsin2ϕ + sin ⁢ ⁢ 2 ⁢ αcos2θcos 2 ⁢ ϕ ) , and wherein n is an integer with β 0 satisfies the following relation: β 0 = θ + 1 2 ⁢ atan ⁡ ( - sin 2 ⁢ ϕ + cos ⁢ ⁢ 2 ⁢ αcos 2 ⁢ ϕ sin ⁢ ⁢ δ 0 ⁡ ( sin ⁢ ⁢ αcos2θsin2ϕ - sin ⁢ ⁢ 2 ⁢ αsin2θcos 2 ⁢ ϕ ) ) .