| 摘要 |
PURPOSE:To maintain the uniformity of brightness even with thin, lightweight, and large-area constitution by forming a light irregular reflection layer on the reverse surface of a transparent substrate in pattern which increases in density corresponding with the distance from a light source, and laminating a light mirror surface reflecting layer and forming a light diffusing layer consisting of fine ruggedness on the surface of the transparent substrate. CONSTITUTION:On the reverse surface of the transparent substrate 1, the light irregular reflection layer 3 which reflects irregularly emitting light from the light source 2 is drawn in the pattern which increases in density in proportion to the distance from the light source 2. The light diffusing layer 5 is formed on the surface of the transparent substrate 1. The light diffusing layer 5 is laminated by screen printing or coating in fine spots by using transparent or translucent, i.e. light-transmissive ink or paint. Consequently, the backlighting device which maintains the superior uniformity of brightness is obtained even when made thin and lightweight and increased in area. |
