| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical sheet which is free, in a backlight unit, from exfoliation caused by the friction between the optical sheet itself and other sheets or the imperfect fixation of a printing ink when printing is executed, since the optical sheet made by using a printing ink causes exfoliation. Ž<P>SOLUTION: The optical sheet diffuses light made incident from one side of a transparent base material and emits the light from the other side of the transparent base material. In addition, an ink having light-diffusing properties is printed in a prescribed pattern to form a light-diffusing part, and fine concave-convex structures are formed on the whole printing surface. Furthermore, the pitches and aspect ratios in the structures are 30-380 nm and 0.5-10.0, respectively. The fine concave-convex structures are conical, pyramidal, pseudo-conical or pseudo-pyramidal in shape. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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