SURFACE LIGHT SOURCE DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

A surface light source device (200) has a light-emitting face, a back face (41b), and multiple side faces, and is equipped with: a surface-emitting light guide plate (4) that causes rays of light entering from a light-incident face (41a) which is any of the multiple side faces to be emitted from the light-emitting face; a first light source (8) that is provided opposing the light-incident face (41a) and emits a first light beam (81) toward the light-incident face; a second light source (9) that emits a second light beam (91); and a light path changing member (6) that guides the second light beam (91) emitted from the second light source (9) to the light-incident face (41a). Both the first light beam (81) emitted from the first light source (8) and the second light beam (91) emitted from the second light source (9) enter the surface-emitting light guide plate (4) from the light-incident face (41a), which is same side face of the multiple side faces.