Patent ID: 9093035
Filing Date: 2015-07-28
Classification: G02F,G09G

Abstract:
1. A transflective liquid crystal display (LCD) device comprising an LCD panel including an array of pixels each having a reflective area and a transmissive area in a liquid crystal (LC) layer, and a drive circuit for driving said reflective area and said transmissive area of said LC layer by using an inverting drive scheme, wherein the drive circuit generates a first common electrode signal periodically inverted in a polarity thereof at a predetermined amplitude, and generates a second common electrode signal having a phase opposite to a phase of the first common electrode signal, the drive circuit drives an LC of one of the reflective area and the transmissive area based on a common pixel signal that is common to the reflective area and the transmissive area, and based on the first common electrode signal, a voltage characteristic, Vr(K)−Vr, of the reflective area is substantially equivalent to a second voltage characteristic, Vt−Vt(K), of the transmissive area when a first drive voltage Vr and a second drive voltage Vt change by a voltage ΔV, the Vr and Vt are drive voltages of the LC in the reflective area and the transmissive area, respectively, Vr(K) is a dark-state setup voltage in the reflective area, Vt(K) is a dark-state setup voltage in the transmissive area, R is a reflectance, and T is a transmittance, The dark-state setup voltage is selected according to a comb teeth clearance, a first common electrode and a first pixel electrode in said reflective area are comb teeth electrodes and are disposed in such a manner that teeth of said first common electrode and teeth of said first pixel electrode are alternately aligned with a clearance Lr in an alignment direction, a second common electrode and a second pixel electrode in said transmissive area are comb teeth electrodes and are disposed in such a manner that teeth of the second common electrode and teeth of the second pixel electrode are alternately aligned with a clearance Lt in an alignment direction thereof, and Lt is greater than Lr, wherein α(R) is 25° where α(R) is an angle formed between a direction in which said teeth of said first common electrode and said first pixel electrode in said reflective area extend and a rubbing direction for said LC, wherein α(T) ranges from 15° to 25° where α(T) is an angle formed between a direction in which said teeth of said second common electrode and said second pixel electrode in said transmissive area extend and said rubbing direction for said LC.