| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical element having a micro-lens array, wherein a moire phenomenon is suppressed to obtain high luminance. SOLUTION: The optical element 1 includes light incidence surface 1a and a light exit surface 1b. The optical element 1 has a plurality of convex or concave micro-lenses 2 provided on at least one of the light incidence surface 1a and light emission surface 1b. The micro-lenses 2 have first to third micro-lenses 3 to 5 of different diameters D1 to D3. The packing ratio of the micro-lenses 2 is 90% or more. COPYRIGHT: (C)2011,JPO&INPIT
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