| 摘要 |
A planar light source device is provided which satisfies the inequality ±1<±2, where ±1 is the angle formed between the direction in which an array of mortar-shaped light-emitting devices (50) emits light of maximum intensity and a vertical direction on a plane containing the vertical direction and the X direction or on a plane containing the vertical direction and the Y direction and ±2 is the angle formed between the direction in which the array of mortar-shaped light-emitting devices (50) emits light of maximum intensity and a diagonal direction (C) across the array on a plane containing the vertical direction and the diagonal direction (C), the first and second unevenness eliminating sheets (113a and 113b) each having surfaces one of which is more distant from the light sources than the other and is shaped such that shapes having upwardly convex cross-sections and extending along a longitudinal direction are arranged at pitches (P'), the pitches (Px and Py) being longer than the pitches (P'). |
