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 comprising:
- light sources placed in a case between a translucent front all formed by a diffuser screen and a rear wall, the light sources being selected according to the desired brightness level, the light sources being mosaics of light emitting diodes lying in the same plane that are placed immediately behind the diffuser screen with, for the highest brightness level, a first mosaic of light-emitting diodes that provides daytime illumination and with, for the lowest brightness level, second mosaic of light sources that supplies night-time illumination, characterized in that the distribution of diodes is such that the diodes of the two mosaics, interpenetrate with a regular pitch.
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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.
26 Citations
16 Claims
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1. A backlighting device, having several brightness levels, for a transmission display screen comprising:
light sources placed in a case between a translucent front all formed by a diffuser screen and a rear wall, the light sources being selected according to the desired brightness level, the light sources being mosaics of light emitting diodes lying in the same plane that are placed immediately behind the diffuser screen with, for the highest brightness level, a first mosaic of light-emitting diodes that provides daytime illumination and with, for the lowest brightness level, second mosaic of light sources that supplies night-time illumination, characterized in that the distribution of diodes is such that the diodes of the two mosaics, interpenetrate with a regular pitch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
Specification