Optical display device

Claim 1

An optical display device comprising a first fluorescent plate containing fluorescent particles, light outlet windows in the form of indentations on two regions of a rear surface of said first plate, the indentations in the first region being in the shape of at least one digit, the indentations in the second region being in the shape of a scale having a plurality of graduations, said indentations having frequency selective dielectric coatings for reflecting frequencies in the emission spectrum of the fluorescent particles, reflective layers on the side surfaces of the plate, a lamp embedded within said plate, a twisted nematic liquid crystal cell adjacent the front surface of said plate aligned with only said first region, said liquid crystal cell having electrodes in the shape of segments being aligned with the indentations in said first region, a second fluorescent plate for collecting light, and a bundle of light conductive fibers for transferring light from said second fluorescent plate to said first fluorescent plate.