Backlighting for Liquid Crystal Display
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Contrast and brightness of liquid crystal display cells are markedly improved by directing relatively well collimated light from the back of the cell toward the front. This is done by using individual cell lenslets. In Fig. 1, light guide plate 1 is silvered over its back surface 2 and most of its front surface 3 except at apertures 4 which permit light to exit. A lens plate 5 covers front surface 3 and carries a plurality of molded lenslets 6. The plate is positioned so that a lenslet is aligned with a respective aperture 4. Each lenslet 6 effects light collimation and directs its light through a respective liquid crystal cell (not shown). Apertures 4 are roughened to improve coupling of the exiting light.