Liquid crystal display devices having an induced cholesteric pha

Details Liquid crystal display devices having an induced cholesteric pha Liquid crystal display devices having an induced cholesteric pha

1979-06-15

1981-04-28

Gron, Teddy S.

Compositions

Radioactive compositions

Nuclear reactor fuel

350350R, 350350S, 350351, 252299, G02F 113, C09K 334

Patent

active

042641489

ABSTRACT:
An operable liquid crystal display device having threshold energy fields dependent on a finite temperature operating range is provided with a layer of a liquid crystal material positioned between the carrier plates of such device. The liquid crystal material includes a nematic carrier material and at least two doping chiral additives, one of which exhibits a clockwise twisting tendency and the other which exhibits a couter-clockwise twisting tendency. The twisting characteristic for the cholesteric phase has a temperature-dependent pitch and, under certain conditions, a temperature-dependent direction of rotation. With such a multiply-doped liquid crystal material and with the application of a controllable select energy field, such as electricity or magnetism to such material, selective display characteristic data can be generated by, for example, a temperature-independent pitch, a helix inversion, or a pitch which greatly increases or decreases with an increasing temperature within the finite temperature range. In such liquid crystal materials, the threshold field strengths are temperature-constant for different display effects or may be compensated to the temperature-dependency of other magnitudes, such as the temperature drift of a driving module designed as an integrated circuit.

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