Sextant Avionique

Thomson-csf Sextant

Fran&ccedil;ois Lopez

Laurent Georges

Christophe Venencie

Nicolas Odille

Fr&eacute;d&eacute;ric De Lauzun

Yves Chevallier

To obtain improved readability of a liquid crystal display screen under varied conditions of ambient luminosity, it is possible to increase the dynamic range of variation of the polarizing voltage. However, this leads to an increase in the electrical power consumption and to contrast reversal defects. To prevent this phenomenon, it is proposed not to modify the dynamic range of variation of polarizing voltage but to shift this range towards the lower voltages when the ambient luminosity increases or towards the higher voltages when the ambient luminosity diminishes. Thus, the white level is favored under high ambient luminosity and the black level is favored under low or normal luminosity.

Method and device for the polarizing of an LCD screen as a function of the ambient luminosity

Optical devices using thin optical films to adapt the characteristics of a light radiation. An optical device includes an optical structure and thin optical films interposed in the path of a light radiation that gets propagated towards the optical structure. The optical films are placed in an enclosed space having dimensions that are greater than the dimensions of the optical films so that the latter are maintained by a float mounting that allows each of them freedom of movement. The device prevents mechanical strains created by differential thermal expansion. Such optical devices may find particular application to liquid crystal display screens.

Optical device with protected thin optical films

Growing community of inventors

Pessac, France

François Lopez

Growing community of inventors

Pessac, France

Fran&ccedil;ois Lopez

François Lopez