Patent ID: 7492424

Claim:
A liquid crystal display device, comprising: a first substrate and a second substrate; a liquid crystal layer having crystal molecules interposed between the first and second substrates; a common electrode, and an upper alignment film orderly disposed at an inner surface of the first substrate; a pixel electrode, and a lower alignment film orderly disposed at an inner surface of the second substrate; a plurality of pixel regions, each of the pixel regions defining a reflection region and a transmission region, wherein the pixel electrode in the reflection regions cooperates with and/or is configured as reflection electrodes, and the pixel electrode in the transmission regions is configured as transmission electrodes; a first upper retardation film and an upper polarizer orderly disposed on an outer surface of the first substrate, and a second lower retardation film and a lower polarizer orderly disposed on an outer surface of the second substrate, wherein the upper and lower retardation films are quarter-wave plates; and a first upper compensation film disposed between the first upper retardation film and the liquid crystal layer, and a first lower compensation film disposed between the first lower retardation film and the liquid crystal layer, respectively, the first upper and lower compensation films are biaxial compensation films; wherein a thickness of the liquid crystal layer in the reflection regions is less than a thickness of the liquid crystal layer in the transmission regions; and a pre-tilt angle of liquid crystal molecules adjacent to one of the substrates is in a range of 0° to 15°, and a pre-tilt angle of liquid crystal molecules adjacent to the other substrate is in a range of 75° to 90°; and 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 F 1 =m (λ/2), m= 0, 1, 2, . . . where RetLCR (VOff) is the phase retardation of the liquid crystal layer in the reflection regions in an off-state, and RetLCR (VOn) is the phase retardation of the liquid crystal layer in the reflection regions in an on-state, and RetF 1 is the phase retardation of the first upper compensation film.