Backlight for a liquid crystal display.

摘要

A backlight system for a liquid crystal device display is equipped with a dual lighting system for day viewing and compatible with night vision systems. The day lighting system uses conventional fluorescent or incandescent lamps (42) for full color display during daytime use. The night lighting system uses a light source (50) which is either filtered to remove infrared and near infrared wavelengths or which is chosen from a class of sources which does not emit such wavelengths. The night lighting source (50) is situated adjacent the edge of a transparent block (46) which directs light to the liquid crystal display (60). The day lighting source (42) may be situated at the edge of the block (46) or behind it. The day lighting system is disabled while the night system is in use. <IMAGE>