NEMATIC LIQUID CRYSTAL DISPLAY, HAVING SURFACE BISTABILITY AND CONTROLLED BY A FLEXOELECTRICAL EFFECT

摘要

the present invention relates to a liquid crystal optical device to bistable type comprising two transparent plates (12, 14) provided with control electrodes (18, 19) and between which is positioned a nematic liquid crystal material (20), which is characterized by the fact that: the transparent plate 12.(14) have a surface treatment which define two stable configurations of molecules of liquid crystal material, which has two components normal to the polarization electrodes flexou00e9lectriques pz1pz2 in opposite directions, and there is provided means (30). the application of electric field pulses to the device perpendicular to the plates (12, 14).directed selectively in one direction or the other.