| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical sheet capable of controlling two-direction viewing angle properties, an illumination unit using the optical sheet, and a display apparatus. <P>SOLUTION: The optical sheet is provided with: a light-transmissive base material 17; a plurality of first unit lenses 3a arrayed on one surface of the base material almost in parallel to one straight line k1 of two straight lines k1, k2 extending perpendicularly to each other along one surface of the base material 17; a plurality of second unit lenses 3b arrayed on one surface of the base material almost in parallel to the other straight line k2 of two straight lines k1, k2; and an optical mask 11 which is arranged on the other surface of the base material 17 on the side opposite to one surface thereof and has openings 12 each extending correspondingly to the top of each of the plurality of first unit lenses 3a and the plurality of second unit lenses 3b. <P>COPYRIGHT: (C)2011,JPO&INPIT |
