A simple and high quality multigap color filter

Abstract

We have developed a high quality and simplified multigap color filter (MCF). A multigap LCD is effective for reduction of color dispersion and improvement of viewing angle. A MCF is achieved by applying a single-layer of transparent positive type photo resist to the multigap color filter. The gap difference is easily determined by controlling amount of the UV exposure. The high degree of flatness of the MCF, compared to that obtained by a double-layer transparent negative type photo resist, is shown. Investigation of the influence of post exposure process on the transmittance is also reported. The high quality, simplified MCF with only one additional coating of photo resist to color filter is easy to apply to many types of LCD, such as OCB and normally black TN for performance improvement.