Liquid crystal color display and method

Details Liquid crystal color display and method Liquid crystal color display and method

1990-05-11

1992-08-25

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 51, 359 68, 359 96, G02F 113, G09G 302

Patent

active

051423898

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. Each liquid crystal layer may include plural volumes of operationally nematic liquid crystal material in a containment medium that tends to distort the natural liquid crystal structure in the absence of a prescribed input. Each layer includes a dye mixed with the liquid crystal material so as to have a particular coloring effect on light incident thereon. By selectively energizing or not respective portions of respective liquid crystal color layers, a multi-color light output can be produced. Such light output may be employed in a liquid crystal display that produces stationary or moving images. A technique is disclosed to make strong, integral, generally fluid-tight capsules of dyed liquid crystal using cross-linking of polymers. A poly(methyl vinyl ether/maleic anhydride) dissolved in the dyed liquid crystal reacts with an ester, e.g. polyvinyl alcohol, to form the strong cross-linked capsule material. Techniques for discriminating voltage and/or frequency magnitude also are disclosed to enable a multicolor response using only a single pair of electrodes. Also, in one embodiment, cross-over liquid crystal having positive to negative dielectric anisotropy characteristics is used.

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