| 摘要 |
PURPOSE:To obtain high electric power consumption-brightness conversion efficiency and high brightness by disposing a sheet consisting of a specific light transparent material in such a manner that the surface having projecting parts exist on an outer side. CONSTITUTION:The sheet 2 consisting of the light transparent material having the many straight peak shapes in a nearly paralleled state is disposed on the light exit surface side of a light transmission plate 1 having a wire-shaped light source 4 at the end and consisting of the light transparent material imparted with light diffusibility in such a manner that projecting parts exist on the outer side. The preferable form of the wire-shaped light source 4 is a light reflector 5 having a spacing for incidence of light on the end of the light transmission plate 1. The wire-shaped light source 4 is coated with this light reflector in the state of having the spacing of a certain width from the light source surface of the light source. The wire-shaped light source is installed in proximity to at least one end face part of the light transmission plate 1 so as to be nearly paralleled with the end face of the light transmission plate 1. At least one sheet of the sheets 2 consisting of the light transparent material are disposed in such a manner, by which the directivity of the light emitted from the light exit surface of the back light is changed and the directivity near to the normal line dropped onto the light exit surface is additionally intensified. |
