To provide an illumination apparatus for a display device which can detect easily a reversed arrangement of the surface or the rear side of an optical sheet and is small in size.
A backlight unit 3 is housed in a tray 32 with its circumference surrounded by walls 32b of the tray so that a laminated optical sheets 33, 34, 35 and 36 can receive light from a fluorescent lamp 31. The top end of a corner A of one of the optical sheets 33, 34, 35 and 36 is formed in a shape in which the corner is cut by linear portions 33c, 34c, 35c and 36c between two sides composing the corner A 33a, 33b, 34a, 34b, 35a, 35b, 36a and 36b, and the wall 32b of the tray 32 has a corresponding surface 32c along the linear portions 33c, 34c, 35c and 36c of the corner A in order to correspond to the shape of the corner A of which the top end is cut, and constrains the linear portions 33c, 34c, 35c and 36c.
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Jiro Murakami
Keiko Mizusawa
Takashi Ishioka