| 摘要 |
PURPOSE:To obtain sufficient brightness and to enable a back light to be used as a high-performance machine whose power consumption-brightness converting efficiency is high with respect to a normal line direction drawn down to at least a light emitting surface. CONSTITUTION:This is the edge-light type back light obtained by partially covering one wide surface of a light transmission plate 1 consisting of a translucent material with a light diffusing matter 6 and covering the surface with a light diffusing and reflecting plate 3. On the light emitting surface side of the plate 1, a film 2 whose light emitting surface is rougher than a light incident surface (light guiding plate side) and which increases the brightness of light emitted from the light emitting surface of the plate 1 when it is arranged on the side of the light emitting surface of the plate 1 is arranged. |
