Patent ID: 7671938
Filing Date: 2010-03-02
Classification: G02F

Abstract:
1. A transflective liquid crystal display (LCD) comprising one or more pixels that are divided into a reflective and a transmissive subpixel and comprise an LC layer sandwiched between a front and a back electrode, being switchable between different orientations upon application of an electric field and having a twist angle φ when no field is applied, a front and a back polarizer sandwiching the LC layer and having front and back polarization directions, at least one quarter wave retardation film (QWF) between the front polariser and the LC layer, which has an optical axis parallel to its film plane, comprises a pattern of regions with quarter wave (λ/4) retardation and regions with substantially no retardation, and is arranged such that the λ/4-regions do essentially cover only the reflective subpixels, wherein the optical axis of the QWF is oriented at an angle of approximately 45° to the front and back polarizer direction, the director of the LC layer at the surface facing the front electrode is oriented at an angle θ1 of from 5 to 45° relative to the polarization direction of the front polarizer, and the director of the LC layer at the surface facing the back electrode is oriented at an angle θ2 of from 5 to 45° relative to the polarization direction of the back polarizer.