SURFACE LIGHT SOURCE DEVICE, LIQUID CRYSTAL DISPLAY APPARATUS AND MOBILE EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To provide a surface light source device which reduces light quantity leaking from a light guide plate.SOLUTION: A light source is arranged oppositely to a light incident edge surface of a light guide plate. A diffusion sheet and a prism sheet are overlapped on an upper surface of the light guide plate and a rim sheet is overlapped on the overlapped diffusion sheet and prism sheet. The edge of the light source side of the diffusion sheet is extended more than the edge of the prism sheet, and at least one side surface of the extended part of the diffusion sheet is covered with a light shielding member. The light guide plate has a directivity conversion pattern 112 for converting the directivity. On the left side area of the light source center C, when a normal N is erected on each pattern slant 114a, 114b toward an outer part from an inner part of the light guide plate, the sum of such a lateral width D2 of pattern slant 114b inclined that the normal N is inclined to the light source center side becomes larger than the sum of such a lateral width D1 of pattern slant 114a that the normal N is inclined to the side opposite to the light source center.