Multiple containment mediums of operationally nematic liquid cry

Details Multiple containment mediums of operationally nematic liquid cry Multiple containment mediums of operationally nematic liquid cry

1990-05-14

1992-04-21

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 52, 359 53, 359 98, G02F 1133

Patent

active

051073528

ABSTRACT:
A liquid crystal color display provides a transmitted light output that is of one or more colors, black, and/or white, as a function of the color of the incident light input and controlled energization or not of respective optically serially positioned liquid crystal color layers and/or multicolor composite liquid crystal color layer(s) in the display. In one case, the display includes a plurality of liquid crystal color layers, each being dyed a different respective color, and apparatus for selectively applying a prescribed input, such as an electric field of a given voltage level or frequency, to a respective layer or layers or to a portion or portions thereof. Each liquid crystal layer includes plural volumes of operationally nematic liquid crystal material in a containment medium that tends to cause an alignment of the liquid crystal structure and, thus, pleochroic dye included or mixed with the liquid crystal material in each layer to absorb light. Each layer is differently colored by the dye so as to have a particular coloring effect on light incident thereon. Exemplary layer colors may be yellow, cyan and magenta, and a multicolor light output can be produced. The containment medium can incorporate cross-linking polymers. The liquid crystal display or apparatus is capable of discriminating voltage and/or frequency magnitude to enable a multicolor response using only a signal pair of electrodes. Also, in one embodiment, cross-over liquid crystal having positive to negative dielectric anisotropy characteristics is used.

REFERENCES:
patent: 4066568 (1978-01-01), Nakazawa et al.
patent: 4201453 (1980-05-01), Kobale et al.
patent: 4574110 (1986-03-01), Asano et al.
patent: 4581608 (1986-04-01), Aftergut et al.
patent: 4878741 (1989-11-01), Fergason

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