Area source device

[0019] Please refer to FIG. 3 and FIG. 4 , which are respectively a perspective view of the first embodiment of the surface light source device of the present invention and a cross-sectional view of the perspective view along the IV-IV direction. The surface light source device 3 includes a light guide plate 31 , a brightness enhancement sheet 32 ​​, two reflectors 33 and two LEDs 34 . Wherein, the brightness enhancement sheet 32 ​​is attached to the light incident surface 311 of the light guide plate 31, the two reflectors 33 are V-shaped groove structures, and are symmetrically distributed with the light incident surface 331 of the light guide plate 31, including the first side The wall 331 and the second side wall 333, wherein the first side wall 331 is perpendicular to the two ends of the light incident surface 311 of the light guide plate 31, and the two ends of the second side wall 333 are respectively connected to the first side wall 331 and the two ends of the light guide