Institut Telecom/telecom Bretagne

Lixys

Bertrand Caillaud

Jean-Louis De Bougrenet De La Tocnaye

Laurent Dupont

Emmanuel Daniel

Robert Bellini

Olivier Castany

Pascal Gautier

Aline Guenot

An optical shuttering device is provided, which includes an optical cell with a liquid crystal material between first and second transparent substrates and controlled by an electronic switching circuit. The switching circuit includes a power supply module, providing a control voltage, and a switching element mounted in series between the power supply module and the cell, making it possible to switch the cell between an on state and an off state. The electronic switching circuit furthermore includes a current source mounted in series between the power supply module and the switching element. The substrates preferably have different thickness and material.

Optical shuttering device based on liquid crystals with attenuation of switching noises of said liquid crystals, corresponding viewing goggles and display device

A method is provided for manufacturing an electrooptic cell, which includes two plates of optically transparent material and at least one thickness of a composite gel based on a smectic liquid crystal and on a polymer provided between the plates, wherein the gel is in a smectic phase at ambient temperature. The method includes injecting a mixture of a ferroelectric and/or anti-ferroelectric smectic liquid and a monomer between the plates, wherein the monomer content of the mixture is between 5 and 25% by weight. The mixture is heated to above its smectic phase/nematic phase transmission temperature so that the mixture is in the nematic phase. The mixture is irradiated, by ultraviolet radiation, so as to polymerize the monomer and thus obtain the gel. During the irradiation step, an electric or magnetic field is applied to the mixture.

Method for manufacturing a PSFLC-based and/or PSAFLC-based electrooptic cell and corresponding electrooptic cell, device and helmet

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Brest, France

Bertrand Caillaud