| 摘要 |
<P>PROBLEM TO BE SOLVED: To equalize emission light luminance by preventing the emission light luminance from being uneven. <P>SOLUTION: A plurality of LEDs 7 are arranged facing an incidence plane 11 of a light guide plate 10. A reflection sheet 12 is arranged on a back surface 14 side of the light guide plate 10. A cover member 8 of the LEDs 7 is arranged in the emitting surface 13 of the light guide plate 10 and near the incidence plane 11 side. A light diffusion member 6, a first light control member 4 and a second light control member 5 are arranged in layers by turns in the emitting surface 13 in which the cover member 8 of the light guide plate 10 is not arranged. Among these, a tip end 12a of the reflection sheet 12 is separated from the incidence plane 12 by a prescribed distance L (approximately 2h tanθ where h is a thickness of the incidence plane 11 of the light guide plate 10 and θ is a critical angle of the light guide plate 10), and an area where the reflection sheet 12 is not located, is formed in the back surface 14 on the incidence plane 11 side. <P>COPYRIGHT: (C)2007,JPO&INPIT |
