BACKLIGHT DEVICE, LIQUID CRYSTAL DISPLAY DEVICE, AND ELECTRONIC APPARATUS USING LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent light of a light source from leaking from a space between a light emitting surface of the light source directly mounted on a drive board and a light entering surface of a light guide plate to degrade light emission efficiency of the light source.

SOLUTION: This backlight device 5 is structured such that the light guide plate 9 is arranged on the drive board 7 with the light source 6 directly mounted thereon by facing the light entering surface 9a to the light emitting surface 6a of the light source 6; light emitted from the light source 6 is guided into the light guide plate 9 from the light entering surface 9a; and the light guided into the light guide plate 9 is refracted by a diffusion sheet 10 and prism sheets 11 and 12 stacked on the light guide plate 9, and emitted to a liquid crystal display panel 4 side. One end of the prism sheet 11 close to the light guide plate 9 within the prism sheets 11 and 12 is extended to the light source 6 side to cover the upper part of a gap δ between the light source 6 and the light guide plate 9, and light leaking from the gap δ is reflected by the prism sheet 11 and returned to the light entering surface 9a side of the light guide plate 9.

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