Backlighting device for display screen by night-vision compatible transmission
First Claim
1. A backlighting device, having several brightness levels, for a transmission display screen (12), comprising light sources placed in a case (14) between a translucent front wall formed by a diffuser screen (20) and a rear wall (21), the light sources being selected according to the desired brightness level, characterized in that the light sources are mosaics (24, 28) of light-emitting diodes (26, 30) that are placed immediately behind the diffuser screen with, for the highest brightness level, a first mosaic (24) of light-emitting diodes that provides daytime illumination and with, for the lowest brightness level, a second mosaic (28) of light sources that supplies night-time illumination.
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Abstract
The present invention relates to a backlighting device, having several brightness levels, for a transmission display screen (12). The device comprises light sources placed in a case (14) between a translucent front wall formed by a diffuser screen (20) and a rear wall (24). The light sources, selected according to the desired brightness level, are mosaics (24, 28) of light-emitting diodes (26, 30) that are placed immediately behind the diffuser screen with, for the highest brightness level, a first mosaic (24) of light-emitting diodes that provides daytime illumination and with, for the lowest brightness level, a second mosaic (28) of light sources that supplies night-time illumination.
Application: light box for transmission display screens
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Citations
16 Claims
- 1. A backlighting device, having several brightness levels, for a transmission display screen (12), comprising light sources placed in a case (14) between a translucent front wall formed by a diffuser screen (20) and a rear wall (21), the light sources being selected according to the desired brightness level, characterized in that the light sources are mosaics (24, 28) of light-emitting diodes (26, 30) that are placed immediately behind the diffuser screen with, for the highest brightness level, a first mosaic (24) of light-emitting diodes that provides daytime illumination and with, for the lowest brightness level, a second mosaic (28) of light sources that supplies night-time illumination.
Specification