Patent ID: 7359019

Claim:
A liquid crystal display device, comprising: a first substrate and a second substrate; a liquid crystal layer having liquid crystal molecules interposed between the first and second substrates; alignment films disposed adjacent to the liquid crystal layer for making the liquid crystal molecules align homogeneously; a first polarizer provided at the first substrate; a first upper retardation film disposed between the first polarizer and the liquid crystal layer, the first upper retardation film being a quarter-wave plate; a first upper compensation film disposed between the first upper retardation film and the liquid crystal layer; a common electrode disposed at an inner surface of the first substrate; a pixel electrode disposed at an inner surface of the second substrate; a plurality of pixel regions, each of the pixel regions including a reflection region and a transmission region; a second polarizer provided under the second substrate; a first lower retardation film disposed between the second polarizer and the liquid crystal layer, the first lower retardation film being a quarter-wave plate; and a first lower compensation film disposed between the first lower retardation film and the liquid crystal layer; wherein the first upper and lower compensation films are biaxial compensation films; wherein a phase retardation relation of the first upper compensation film and the liquid crystal layer in the reflection regions is represented by the following formulae: Ret LCR ( V Off )−Ret LCR ( V On )=λ/4 ±m (λ/2), m =0, 1, 2, . . . Ret LCR ( V On )+Ret F1 =m (λ/2), m =0, 1, 2, . . . where Ret LCR (V Off ) is the phase retardation of the liquid crystal layer in the reflection regions in an on-state, Ret LCR (V On ) is the phase retardation of the liquid crystal layer in the reflection regions in an off-state, and Ret F1 is the phase retardation of the first upper compensation film.