Day/night backlight for a liquid crystal display.

摘要

A backlit liquid crystal display device having improved nighttime operational characteristics includes a fluorescent lamp (300) for daytime operation and a separate light source (398) for nighttime operation which emits a low-intensity light. Preferably, the nighttime light source (398) is an electroluminescent panel which also acts as a daytime reflector of light. An integral image-splitting and collimating lens (302) is provided to increase the uniformity of the light emitted and to provide wide angle viewability. A sharp cut-off IR filter may also be included in the device to provide NVIS-B night vision goggle compatibility. <IMAGE>