Color liquid crystal display backlight system for night...

G - Physics – 02 – F

Patent

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G02F 1/1335 (2006.01) G02F 1/13357 (2006.01)

Patent

CA 2166553

The disclosure is directed to a color liquid crystal display backlight system for daytime and nighttime use. Night vision imaging system requirements ate met so that light emissions from the 630 nm to 930 nm range are substantially reduced or eliminated. Separate daytime and nighttime light sources ate utilized. The NVIS compatible nighttime source is positioned to be out of sight of a user and produces an appropriately filtered, substantially collimated beam which diffusively reflects from the inside walls and base of the display housing before it illuminates the display surface. Intensities of both daytime and nighttime light sources can be controlled.

L'invention concerne un système de rétro-éclairage pour affichage à cristaux liquides en couleurs, utilisable aussi bien de nuit que de jour. On respecte les exigences propres aux systèmes d'affichage d'images pour vision nocturne de manière à sensiblement réduire ou éliminer les émissions lumineuses dans la gamme 630-930 nm. On utilise des sources lumineuses séparées pour le jour et la nuit. La source lumineuse nocturne, compatible avec ce système d'affichage d'images nocturne, est placée hors du champ de vision de l'utilisatieur et produit un faisceau nettement collimaté et judicieusement filtré qui se reflète de manière diffuse sur les parois internes et le fond du boîtier de l'afficheur avant d'eclairer la surface d'affichage. On peut régler les intensités des sources lumineuses tant diurne que nocturne.

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