Nemoptic

France Brevets

Patrice Davi

Daniel Stoenescu

Alexandre Carton

Cécile Joubert

A device nematic liquid crystal display device has two stable states corresponding to two liquid crystal molecule textures whose torsion differs by 150&#xb0; to 180&#xb0; in terms of absolute value. The device includes two polarizers (), one () of which is placed on the observer side, the other () being placed on the opposite side of the liquid crystal cell. The orientation of the two polarizers is offset by a value which is equal to the rotatory power of the cell+/&#x2212;&#x3a0;/2, the rotatory power corresponding to the most twisted texture effect.

Display device with a black-optimizing bistable nematic screen and method for the definition of said device

The invention relates to a nematic liquid crystal display having two stable states, without an electric field, obtained by anchoring break, characterized in that it comprises two polarizers (), one () of which is placed on the observer side, the other () being placed on the opposite side of the liquid crystal cell whereby the latter is at least partially reflecting in order to define a reflective mode or transflective mode. The orientation of the two polarizers () is offset by a value which is equal to the rotatory power of the cell at approximately +/&#x2212;30&#xb0;.

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Sevres, France

Patrice Davi