Nemoptic, S.a.

Instituto Nationale Per La Fisica Della Materia

Michele Giocondo

Ivan N Dozov

Georges E Durand

Philippe Martinot-Lagarde

Eric Polossat

Riccardo Barberi

Roberto Bartolino

Ioannis Lelidis

Jun Li

Maurizio Nobili

Ricardo Barberi

A display device including two parallel transparent plates (,) having transparent electrodes on the inner surfaces thereof and containing a liquid crystal material (,). The device includes means defining a monostable anchoring for each plate (,), means (,) controllable to break at least one of the anchorings, and means for thereafter inducing volume bistability.

Bistable liquid crystal display device in which nematic liquid crystal has monostable anchorings

The present invention relates to a display device based on liquid crystals, comprising a nematic liquid-crystal material (10) with positive dielectric anisotropy sandwiched between two transparent confinement plates (20, 30) each provided with transparent electrodes (22, 32), characterized in that at least one of the plates, (30), defines a quasi-bistable anchoring and in that it is provided with main electrical supply means (40) suitable for applying a temporary electric field to the liquid-crystal material (10) capable of breaking the anchoring on the aforementioned plate (30) and subsequently allowing, due to the effect of hydrodynamic instabilities, various localized orientations of the liquid-crystal molecules (10) corresponding to the preferred orientations of the quasi-bistable anchoring.

Bistable display device based on nematic liquid crystals allowing grey

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Arcavacata di Rende, Italy

Michele Giocondo