Liquid crystal device having a phase plate and particular dye co

Details Liquid crystal device having a phase plate and particular dye co Liquid crystal device having a phase plate and particular dye co

1989-11-22

1992-07-28

Hille, Rolf

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 96, 359102, G02F 113

Patent

active

051345064

ABSTRACT:
An ingenious STN type liquid crystal device having a layer of phase film and comprising a liquid crystal composition that contains a two-color pigment as additive for compensation of the color of the device per se is disclosed. Such a device has a clear black and white display effect and can be manufactured at a low cost. Moreover, since only a small amount of pigment is used as additive, the original drive characteristics, contrast and brightness of the device is not adversely affected by the pigment.

REFERENCES:
patent: 4434072 (1984-02-01), Imahori et al.
patent: 4497543 (1985-02-01), Aoki et al.
patent: 4589734 (1986-05-01), Needham et al.
patent: 4906073 (1990-03-01), Hunahata et al.
patent: 4909606 (1990-03-01), Wada et al.
M. Schadt and F. Leenhouts, "The Optical Mode Interference Liquid-Crystal Display", SID 87 DIGEST, (1987), pp. 372-375.

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