| 摘要 |
A multi-functional type backlight unit and an information device using the backlight unit are provided to realize a backlight function through the backlight unit, a communication function to allow communication with an external information device through a light guiding plate, or a charging function through the light guiding plate and a solar battery. A light guiding plate(1) includes a first incident/exit surface(2) and a second incident/exit surface(3). A light emitting device is disposed to face the first incident/exit surface, and supplies light to the first incident/exit surface. A light receiving device is disposed to face the first incident/exit surface, and receives light emitted from the first incident/exit surface. The light emitted from the light emitting device enters the first incident/exit surface, passes through the light guiding plate, and exits from the second incident/exit surface. The light enters the second incident/exit surface, passes through the light guiding plate, and exits from the first incident/exit surface to the light receiving device.
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