Patent ID: 8462299

Claim:
A reflection type liquid crystal display device comprising: a first substrate provided with a light-transmitting electrode; a second substrate provided with a light-reflecting electrode; and a liquid crystal layer which can optically rotate a polarized plane of incoming polarized light, wherein, said first and second substrates are disposed in opposition to each other so that said light-transmitting electrode and said light-reflecting electrode face each other, said liquid crystal layer is composed of vertically aligned liquid crystal molecules interposed between said first and second substrates with each of said liquid crystal molecules controlled to a desired tilt angle corresponding to a voltage applied to said liquid crystal layer, the conditions of d·Δn·|Δ∈| 2 ≧5, d≦2.5, |Δ∈|≧7, and Δn>0.1 are satisfied such that a saturation voltage of the liquid crystal display is not more than 4.0 volts at a light wavelength of 550 nm, where d is the thickness in μm of said liquid crystal layer, Δn is the refractive index anisotropy of said vertically aligned liquid crystal molecules, and Δ∈ is the dielectric constant anisotropy of said vertically aligned liquid crystal molecules, and the relationship of d·Δn(eff)=λ/4 is satisfied, where λ is the wavelength of the light traversing the liquid crystal layer, d is the thickness in μm of said liquid crystal layer, Δn(eff) is the effective refractive index anisotropy of said vertically aligned liquid crystal molecules.