Study of liquid crystal materials for storage-type LCDs driven by C-MOS LSIs

Abstract

Liquid crystals using nematic-cholesteric phase change can be used in dot matrix displays of more than 500 scanning lines. High driving voltage requirements, such as 20 V, and the transient disappearance of written images on the way to memory after writing are two drawbacks of this display. We are developing a storage-type liquid crystal display, which can be driven by C-MOS LSIs, that overcomes these drawbacks. Lowering the viscosity of the liquid crystal mixture containing nematic and cholesteric materials was investigated to see if a lower driving voltage could be used. To shorten the transient disappearance time, dispersion of the helical pitch distribution, which storage-type liquid crystal shows, has been studied. Reducing the driving voltage enables us to drive the storage-type liquid crystal display with a C-MOS LSI. Since the problem of transient disappearance has been solved, this type of panel can be used for large-sized displays.

Flexible Bistable Smectic-A Liquid Crystal Device Using Photolithography and Photoinduced Phase Separation

“…Bistable liquid crystal (LC) devices have been extensively investigated and used for display applications because of their unique electrooptic properties, mainly the ability to maintain an image indefinitely without power consumption [1][2][3][4][5][6][7][8][9]. Many ways have been developed to produce bistable LC devices over the past years [10].…”