Back light device

Abstract

Abstract PURPOSE:To improve a liquid crystal display function, by constituting a device so that reflected light by uniformly distributed illuminance from entire area of a back light plate can be obtained at the front plane of the plate by the irregular reflection of light reflected from a light source on a light reflecting means. CONSTITUTION:The back light plate A is formed by applying light transmission resin coating 2 and 3 with a refractive index different from that of a transparent substrate 1 enabling illumination light to be projected from at least one peripheral edge out of four peripheries at the front and back planes of the substrate and providing the light reflecting means 5 by a plotted reflection pattern on the rear plane of the transparent substrate 1 based on the distribution of density inversely proportional to a distance and the illuminance from projected light. Also, the light source 6 is set fixedly at the peripheral edge side where the projected light can be projected on the back light A, and the reflected light by the uniformly distributed illuminance from the entire area of the back light plate A on its front plane can be obtained by the irregular reflection projected by the light reflecting means 5 form the light source 6. In such a way, it is possible to display the liquid crystal display body of a liquid crystal plate 7 arranged at the front plane of the back light plate A clearly by receiving the reflected light D from a rear entire area.

Inventors

• 👤 Tatsuji Mizobe
• 👤 達司 溝部

Bibliographic Details