| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a surface light source device having a structure which hardly generates luminance unevenness between adjacent surface light source units. <P>SOLUTION: The surface light source device for lighting a transmissive liquid crystal display device from a rear surface is provided with a diffusing plate 61, and is formed of P×Q surface light source units 42. Light sources 41 provided in the surface light surface units 42 are respectively controlled. A barrier rib 44 partitions between the surface light source unit 42 and the surface light source unit 42. A clearance exists between a top face 45 of the barrier rib 44 and the diffusing plate 61. The barrier rib 44 is formed of a transparent material. In letting a thickness direction of the barrier rib as an X direction, an extending direction as a Y direction, and a height direction as a Z direction, a length along the X direction of a part 45' corresponding to the top face 45 of the barrier rib 44 in a barrier wall cross sectional shape when the barrier rib 44 is cut in an XZ plane passing a center of the light source 41 is longer than a length along the X direction of other part of the barrier rib 44 in the barrier rib cross sectional shape. <P>COPYRIGHT: (C)2008,JPO&INPIT |
