| 摘要 |
In a backlight device 10 comprising a light guide 12, a light source 14, a prism sheet 16, a polarized beam splitter sheet 18, and a light reflection sheet 20, the light reflection sheet 20 is composed with the provision of a regular reflection plane 20A in a shape of flat surface, and the direction of the normal standing on the regular reflection plane 20A is substantially the same as the directions of the normals standing respectively on the above-mentioned prism sheet 16 and on the polarized beam splitter sheet 18.
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