Backlighting device and color display device

Abstract

To achieve a backlighting device having excellent light utilization, there is provided an edge lighting-type backlight having a light guiding member, a high-refractive-index layer formed thereon and having a higher refractive index than the light guiding member, and a scattering layer formed on the high-refractive-index layer. Light from a light source disposed facing the edge of the light guiding member enters the high-refractive-index layer through the light guiding member, and effectively scatters scatterers to produce high brightness, and furthermore, to achieve a color display device that eliminates color. mixing in a transparent display device for decorative or various display uses, a construction is provided in which on one surface of a light guiding plate there are formed a high-refractive-index layer having a higher refractive index than the light guiding plate, a light scattering layer, and a low-refractive-index layer having a lower refractive index than the light guiding plate, one on top of another in this order, and on top of that structure another light guiding plate is provided, on top of which a high-refractive-index layer and a light scattering layer are likewise formed, while a color filter is disposed on one edge face of each light guiding plate and a light source is disposed near each color filter.

Dependencies are inferred from the claim text.