Patent ID: 7271865
Filing Date: 2007-09-18
Classification: G02F

Abstract:
1. A reflective liquid crystal display comprising: a top substrate having a compensation film set and a linear polarizer laminated thereon on the outer surface; a bottom substrate having a reflector laminated thereon on the inner surface; a first aligmment film with a first rubbing direction coated on the inner surface of the top substrate, a second alignment film with a second rubbing direction coated on the reflector means, and a twisted nematic liquid crystal layer sandwiched between the top substrate and the reflector means, wherein the twisted nematic liquid crystal layer contacts with both the first alignment layer and the second alignment layer, wherein the twisted nematic liquid crystal layer has a twist angle φ at voltage-off state and has a residual phase retardation α on each boundary at the voltage-on state; and wherein the compensation film set has an effective phase retardation value δ in the range (δ where the effective slow axis angle θ of the compensation film set is in the range of 0°≦θ≦180° and an effective slow axis direction θin reference to the first rubbing direction of the top substrate, and the compensation film set herein is used to compensate the boundary residual phase retardation of the twisted nematic liquid crystal layer at voltage-on state to improve a contract ratio of the reflective liquid crystal display.