| 摘要 |
In a back light device 10 according to the present invention, a long and flat fluorescent lamp 11 with a flat shaped cross section has a major axis and a minor axis having different lengths to each other. A light incident plane 121a of a light guide plate 12 is formed in a light emitting area of the light guide plate. A light incident plane and a major axis light emitting plane of the flat fluorescent lamp are arranged to be facing to each other. With the structure, the back light device is provided in which a thickness of the device can be made thinner than that of a direct type back light device and the width of the device can be made narrower than that of an edge light type back light device. Thus, a slim model, a narrow frame and a small size can be attained.
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