Asia Display '95. A Wobbling Device Using Ferroelectric Liquid Crystals for High Resolution Projectors.

A technique for apparently doubling the number of pixels of a TFT-LCD panel is proposed. A wobbling technique utilizes the rotation of the polarized planes of light irradiated from TFT-LCD by a ferroelectric liquid crystal (FLC) device to shift pixels. The FLC wobbling device combined with a projector which uses a single TFT-LCD panel has doubled the vertical resolution from 240 to 480 lines. When a projector which uses 3 TFT-LCD panels with 480 horizontal lines was used, a vertical resolution of 800 to 1000 lines was achieved and the depixelization effect, which eliminates the pixel images on the screen resulting in a smooth CRT-like picture, was also confirmed. To overcome the problem of the narrow operating and storing temperature range as well as of low reliablility, we have developed a FLC mixture. This mixture has a smectic C* temperature range from -33 to 86°C and it has passed tests, including mechanical shocks at 100 m/s2 level and continuous driving at 75°C for more than 1000 hours, thus confirming its high reliability.