| 摘要 |
A backlight unit 12 includes LEDs 15, light guide plates 18, reflection sheets 24, LED boards 17 and reflection parts 47. Each light guide plate 18 has a light entrance surface 34 and a light exit surface 36. The light entrance surface 34 is arranged so as to face the corresponding LED 16 via a gap C. Light from the LED 16 enters the light entrance surface. The light exit surface 36 is arranged parallel to an arrangement direction in which the LED 16 and the light entrance surface 34 are arranged. The light exits from the light exit surface. Each reflection sheet 24 is arranged on an opposite surface of the corresponding light guide plate 18 from the light exit surface and configured to reflect light toward the light exit surface 36. Each LED board 17 is arranged so as to face the corresponding reflection sheet 24. The LEDs 16 and the light guide plates 18 are mounted to the respective LED boards 17. Each reflection part 47 is arranged on the corresponding LED board 17 at least in an area between the LED 16 and the light entrance surface 34 and configured to reflect light toward the light entrance surface 34.
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