Analysis of light efficiency in homogeneously aligned nematic liquid crystal display with interdigital electrodes

A homogeneously aligned nematic liquid crystal display with interdigital electrodes has been known to exhibit wide viewing angle due to in-plane rotation of liquid crystal director with applied voltage, and low transmittance due to no twist deformation of liquid crystal director above electrodes. The transmitted light of the device depends on the ratio of cell gap, the distance between electrodes, the width of electrodes and the dielectric anisotropy of the liquid crystal. Recently we have found that light efficiency is much more effective for fringe-field driven device than in-plane field driven one. This paper reports simulational and experimental studies on the light efficiency depending on electrode design and liquid crystal in detail.