Light diffuser for publicity display panel or LCD back-light - has flat plate in front of light tube with aperture fields providing increasing transparency with distance from light tube

摘要

The diffuser (4) is positioned adjacent to the light tube (3) facing the front cover plate (5) and is partially reflective on the side facing the light tube and has areas with different transparencies. The diffusor comprises a flat plate parallel to the front cover plate, with a width of between 2 and 5 times the width of the light tube (3). The diffuser plate is opaque in the area immediately in front of the light tube, the transparency increasing with the distance from the light source (3), provided by 2 aperture fields, on either side of the centre line, with holes of varying size and/or spacing. ADVANTAGE - Uniform light distribution with low overall height.