Electro-optical display element
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsAkio Moriyama, Masakazu Fukai, Hiroshi Tatsuta, Hiroaki Takahashi
Life of this patent
Estimating the term…
Abstract
An electro-optical element comprising a nematic liquid crystal composition and at least one compound represented by the formula: ##SPC1## Wherein R is an alkyl radical having from 4 to 20 carbon atoms. Said compounds are pleochroic dyes having a special function which differs from hitherto known dyes in their interaction with nematic liquid crystal molecules. The electro-optical element makes it possible to obtain a liquid crystal display device which exhibits the desired figure in color differing from background colors.
Claims8
An electro-optical element comprising a nematic liquid crystal composition and at least one compound represented by the formula ##SPC11##
- wherein R.sub.1 is n-alkyl radical having from 5 to 20 carbon atoms and R.sub.2 is an n-alkyl radical having from 4 to 20 carbon atoms.
An electro-optical display device comprising two parallel transparent members whose inner surfaces have been coated with transparent electrodes;
- an electro-optical element comprising a nematic liquid crystal composition and at least one compound represented by the formula ##SPC14##
- wherein R.sub.1 is an n-alkyl radical having from 5 to 20 carbon atoms and R.sub.2 is an n-alkyl radical having from 4 to 20 carbon atoms, said electro-optical element being interposed between said electrodes and having all its molecules in their quiescent state, nonelectrically aligned perpendicular or parallel to such facing surfaces, and means for selectively applying an electric field across said electro-optical element through said electrodes to exceed a threshold electric field.
Dependencies are inferred from the claim text.