Saint-Gobain Glass France

Centre National De La Recherche Scientifique

Frédéric Mondiot

Hervé Montigaud

A liquid crystal optical system includes a variable polarization electro-switchable device forming a variable polarizer, the variable polarizer including first and second transparent electrodes with an electric field between the first and second electrodes, the first and second electrodes are coplanar, forming an alternation of first and second electrically conductive strips—at distinct potentials, and an electroactive layer made of a material including liquid crystals which are nematic and dichroic dyes.

Liquid-crystal optical system

An optical system composed of a first electrically controllable device which has variable scattering and color by first liquid crystals stabilized in a polymeric network and first dichroic dyes and a second electrically controllable device having variable polarization by second liquid crystals and second dichroic dyes.

A device having variable scattering by liquid crystals includes a stack with a first electrode, an electroactive layer with liquid crystals being stabilized by the polymeric network, and a second electrode. The material exhibits, from a temperature referred to as T1, a mesophase referred to as P. At a temperature T' greater than or equal to T1, the stack is capable of exhibiting at least three stable and reversible scattering states in the visible range and a variable color.

Electrically controllable device having variable diffusion by liquid crystals, and method for same

A device having scattering which can be varied by liquid crystals includes a stack with a first electrode, an electroactive layer with the liquid crystals being stabilized by the polymeric network, a second electrode. The material exhibits, starting from a temperature referred to as T1, a mesophase referred to as P. At a temperature T' greater than or equal to T1, the stack is capable of exhibiting at least three variable scattering states, which are stable and reversible, in the visible region.

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Antony, France

Frédéric Mondiot