| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a surface light source device capable of making directivity of light distribution different, without deteriorating the display quality and brightness, at low price. <P>SOLUTION: The surface light source device 100 is equipped with a light guide plate 30, having a light reflecting face 33 in which a first and a second inclined faces 36a, 36b asymmetrical in a light introduction direction are formed; and a first and a second light sources 10, 20 arranged opposed to mutually opposing side faces 31, 32 of the light guide plate 30. The light introduced inside of the light guide plate 30 from the first light source 10 has directivity in a perpendicular direction and is emitted from the surface light source device 100, and the light introduced inside the light guide plate 30 from the second light source 20 has directivity in the three directions of the perpendicular direction and in the inclined directions, respectively to the right and left from the perpendicular direction, and is emitted from the surface light source device 100. <P>COPYRIGHT: (C)2010,JPO&INPIT |
