| 摘要 |
PURPOSE: To prevent the degradation in luminance and to assure the uniformity of luminance by directing diffusion so as to supply the incident light from the effective light emitting part of a primary light source near to both ends of an incident end face where there is no supply of the incident light. CONSTITUTION: A primary light source 20 of a liquid crystal back light is formed by disposing respective lead terminal parts 22 so as to face respectively both longitudinal ends of the incident end face 13 of the edge light panel 10. As a result, a fluorescent tube part 21 of the glass tube part of the primary light source 20 is made to emit light and the incident light is supplied to the edge light panel 10 to effect the secondary surface light emission of the panel 10 by irregular reflection patterns 12. At this time, the fine mirror finished longitudinal grooves 16 of the incident end face 13 disperse and supply the incident light from the fluorescent tube part 21 of the effective light emitting part to sections 17, by which the function of the irregular reflection patterns 12 of the sections 17 is exhibited to completely eliminate the sections 17 of the degraded luminance. The high uniformity of the luminance is thus assured. |
