REFLECTIVE FFS-LCD

摘要

PURPOSE: A reflective FFS-LCD(Fringe Field Switching mode Liquid Crystal Display) is provided to obtain the maximum reflectivity without regard to transmissivity of a reflective FFS-LCD by keeping a screen white when an electric field is off, and driving an LCD in a normally white mode if an electric field is on. CONSTITUTION: A lower substrate(21) is arranged opposite to an upper substrate(25) with a cell gap. A counter electrode(22) and a pixel electrode(23) are formed inside the lower substrate to form a fringe field. The counter electrode and the pixel electrode are formed by metal films having high reflectivity. An LC layer(26) having positive dielectric anisotropy is formed between the lower substrate and the upper substrate. The LC layer adjusts phase retardation, the multiplication anisotropy in refractive index and a distance between the upper and lower substrates to be used as a half wave plate. Plural parallel alignment layers are formed between the inside of the lower substrate and the LC layer and between the inside of the upper substrate and the LC layer respectively. Each parallel alignment layer has an anti-parallel rubbing axis. Each alignment layer is rubbed to have a specific angle between each rubbing axis and the substrate transmitting line of a fringe field. A polarizer(28) is adhered to the outside of the upper substrate and has an angle of 10-40 degrees, preferably 22.5 degrees with the rubbing axis. A quarter wave plate(29) is arranged outside the lower substrate to polarize incident or reflected beam by a quarter wave. A reflecting plate(30) is formed outside the quarter wave plate to polarize the transmitted beam of the quarter wave plate at 180 degrees.