C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
375/39, 345/8
C09K 19/60 (2006.01) C09K 19/54 (2006.01) G02F 1/13 (2006.01) G02F 1/1334 (2006.01) G02F 1/1347 (2006.01) G02F 1/139 (2006.01) G09F 9/35 (2006.01)
Patent
CA 1283728
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 differentrespective color, and apparatus for selectively applying a prescribed input, such as an electric field, 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 distort the natural liquid crystal structure in the absence of a prescribed input, such as an electric field, and pleochroic dye is included or mixed with the liquid crystal material in each layer. 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. In the absence of the prescribed input, the dyed liquid crystal material in a given layer dyes, colors or filters the light transmitted therethrough. In the presence of the prescribed input, such as a signal of a given voltage level or frequency, to a layer or a portion thereof, such layer or portion becomes substantially optically transparent having no or minimal coloring effect on the light transmitted therethrough. 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 and in the latter case may produce a visual output similar to that produced by conventional color television. 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 magni- tude 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.
502981
Manchester R. & D. Limited Partnership
Swabey Ogilvy Renault
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