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We have developed a 12.1-inch, XGA Liquid Crystal Privacy-Enhanced Display for mobile PCs. Only an authorized viewer with shutter glasses can see a private image while other viewers see a public image. The privacy enhanced display system is based on a high-frame rate image switching technology. In general, it is difficult for LCD to achieve the high speed image switching because of its slow response speed. A high speed driving scheme and a high frame rate overdriving method made it possible to realize this function in LCD.

We succeeded in developing a field-sequential color system-on-glass (SOG) LCD with a twisted-nematic mode using a novel material and novel driving method. We achieved a 4-ms response time and operation over a wide range of temperatures with a 2.1-μm cell gap. High optical efficiency was demonstrated with an aperture ratio of 59% and a 17.5-μm pixel pitch.

We have performed a novel motion picture simulation that can reproduce the perception of moving images on a screen of hold-type displays as still images. It can be used to evaluate motion picture quality quantitatively and to help improve the quality through optimization of the values of relevant parameters in hold-type displays like liquid crystal displays.

A field-sequential color smectic LCD has been developed using low-temperature poly-Si TFTs. An active-load type TFT pixel amplifier is used to drive a V-shaped-switching smectic LC without voltage fluctuation. The optical response time is 300 μs for a field frequency of 180 Hz. This LCD is capable of displaying high-quality motion-picture images.