Liquid crystal dichroic display with a high brightness contrast

Details Liquid crystal dichroic display with a high brightness contrast Liquid crystal dichroic display with a high brightness contrast

1985-05-22

1987-01-27

Corbin, John K.

350347E, 350349, G02F 113

Patent

active

046390901

ABSTRACT:
The display comprises a cholesteric liquid crystal film in which are embedded dye molecules between the two walls separated by a shim. One wall is at least partly covered by a reflecting coating reversing the polarization of a circularly polarized electromagnetic wave. The optical anisotropy .DELTA.n and the helix pitch p are such that the least absorbed wave on passing through the cell has an ellipticity equal to or greater than .pi./8.

REFERENCES:
patent: 4278328 (1981-07-01), Mukoh et al.
patent: 4398805 (1983-08-01), Cole
Ishibashi, T. et al., "On the Multiplexing of the Phase Change Type Color LCD," 1980 Biennial Display Research Conf., (Oct. 1980), pp. 186-188.
Scheffer, T. J., "Electrically Controlled Colour Filters Using Liquid Crystals," Institute of Physics Conference Series, No. 40 (Brighton, U.K. 12-15 Sep. 1977), pp. 65-86.

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