Patent ID: 8049850

Claim:
A liquid crystal display device comprising a pair of substrates disposed to face each other, at least one of them having an electrode, and a nematic liquid crystal material interposed between the pair of substrates; and having a liquid crystal cell having a liquid crystal layer in which the liquid crystal molecules of the nematic liquid crystal material align approximately vertically to the surfaces of the pair of substrates during dark state, a first polarizing film and a second polarizing film disposed such that the liquid crystal cell is interposed between the films, an optical compensatory film disposed between the liquid crystal layer and one of the first and second polarizing films, and a cellulose acylate film disposed between the liquid crystal layer and at least one of the first and second polarizing films, wherein when the thickness of the liquid crystal layer is d (unit: nm), the refractive index anisotropy at a wavelength λ (unit: nm) is Δn (λ) , the sum of the in-plane retardations of the optical compensatory film and the cellulose acylate film at the wavelength λ is Re sum(λ) , and the sum of the retardations of the optical compensatory film and the cellulose acylate film in the thickness direction at the wavelength λ is Rth sum(λ) , with respect to at least two different wavelengths in the wavelength range of 380 nm to 780 nm, the following formulas (V) to (VIII) are satisfied: 200 ≦Δn (λ) ×d≦ 1000, (V) Rth sum(λ) /λ=E×Δn (λ) ×d/λ, (VI) Re sum(λ) /λ=F×λ/{Δn (λ) ×d}+G, and (VII) 0.726≦E≦0.958, (VIII) 0.0207≦F≦0.0716, and G=0.032; and wherein when the in-plane retardation of the cellulose acylate film at the wavelength λ (unit: nm) is Re 2(λ) , and the retardation in the thickness direction of the cellulose acylate film at the wavelength λ (unit: nm) is Rth 2(λ) , the following formulas (IX) and (X) are satisfied: 0≦Re 2(630) ≦10 and |Rth 2(630) |≦25, and (IX) |Re 2(400) −Re 2(700) |≦10 and (X) |Rth 2(400) −Rth 2(700) |≦35.