| 摘要 |
PURPOSE: To provide a backlight device capable of generating an output light spreading at an angle smaller than 10-degree FWHM, requiring a lower manufacturing cost and improving the usage efficiency of a light from a light source. CONSTITUTION: A backlight device has a wedged light conductor of refraction factor n1 having an upper face, a bottom face and side faces, a light source for applying a light to the side faces of the wedged light conductor, a first light transmissive layer of refraction factor n2, smaller than the refraction factor n1, having an upper face and a bottom face, the upper face of the first light transmissive layer being mounted on the bottom face of the wedged light conductor, and a light deflecting layer having an upper face mounted on the bottom face of the first transmissive layer for deflecting an incident light from the first light transmissive layer toward the upper face of the wedged light conductor.
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