Backlighting device for display screen by night-vision...

H - Electricity – 05 – B

Patent

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Details

H05B 33/02 (2006.01) B60Q 3/04 (2006.01) B64D 47/02 (2006.01) G02F 1/1335 (2006.01) G02F 1/13357 (2006.01)

Patent

CA 2435454

The invention concerns a backlighting device, with several luminance levels, for transmission display screen (12). The device comprises light sources arranged in a housing (14) between a front translucent wall consisting of a diffusing screen (20) and a rear wall (24). The light sources, selected on the basis of the desired luminance level, are mosaics (24, 28) of light-emitting diodes (26, 30) placed immediately behind the diffusing screen with, for the highest luminance level, a first mosaic (24) of light-emitting diodes providing day time illumination and, for the lowest luminance level, a second mosaic (28) of light-emitting diodes providing night time illumination lighting. The invention is applicable to illumination box for transmission display screens.

La présente invention est relative à un dispositif de rétroéclairage, à plusieurs niveaux de luminance, pour écran de visualisation par transmission (12). Le dispositif comporte des sources lumineuses disposées dans un boîtier (14) entre une paroi avant translucide formée d'un écran diffuseur (20) et une paroi arrière (24). Les sources lumineuses, sélectionnées en fonction du niveau de luminance souhaité, sont des mosaïques (24, 28) de diodes électroluminescentes (26, 30) placées immédiatement derrière l'écran diffuseur avec, pour le niveau de plus forte luminance, une première mosaïque (24) de diodes électroluminescentes fournissant un éclairage de jour et avec, pour le niveau de plus faible luminance, une seconde mosaïque (28) de sources lumineuses fournissant éclairage de nuit. Application : boîte à lumière pour écrans de visualisation par transmission.

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