| 摘要 |
A backlight device (10) is provided with an optical member (17) laid on a planar light source. The optical member (17) is provided with a lenticular lens sheet (14) having a plurality of cylindrical lenses (CL1) arranged in parallel, and a lenticular sheet (15) which is laid on the lenticular lens sheet (14) and has a plurality of cylindrical lenses (CL2) arranged in parallel. Thus, light emitted in a diagonal direction to the front is suppressed and high front luminance is provided.
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