| 摘要 |
PURPOSE:To increase the angle of a visual field, to reduce layer thickness and weight, and to control the quantity of light and its wavelength according to the environment by guiding light from a light source to a light projection surface efficiently through the constitution of the light source and a light projection panel consisting of a light guide surface, a light guide part, a light reflecting layer, and the convex light projection surface. CONSTITUTION:The light source A and the light projection panel which consists of the light guide surface 1, light guide part 2, light reflecting layer 8, and light projection surface 3 are provided, and the light from the light source A is incident slantingly on the convex light projection surface 3 through the guide part 2 to increase the angle of the visual field of a liquid crystal display 5. An optical filter is provided at the periphery of the light source A to control the quantity of light and hue. Thus, the light from the light source is guided to the light projection surface efficiently to obtain the plane light source which is sized large and thin on the whole.
|
