High contrast back lit liquid crystal display system

DETAILED DESCRIPTION The high contrast back lit liquid crystal display system of this invention comprises a transparent front cover plate, which may or may not be required, an information-bearing liquid crystal display behind the cover plate, a dimmable incandescent lighting means disposed behind the liquid crystal display, and an internal optical filter element which strongly attenuates the longer wavelengths present in the visible spectrum emitted by the incandescent lighting means which is disposed between the cover plate and the incandescent lighting means of the display system.
The optical filter element is preferrably a blue or blue-green red absorbing optical filter which is located between the liquid crystal display element and the incandescent lighting means.