| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress attenuation of light intensity and deterioration in optical use efficiency by a member for diffusion and to inexpensively reduce luminance unevenness. <P>SOLUTION: On this optical sheet, many pieces of unit prism structure 23 in the projected shapes are continuously formed on one surface on a transparent substrate 22, wherein each of the pieces of unit prism structure 23 includes a first slope 26 and a second slop 27 which are at least two planes formed at a mutually adjacent state on the boundary of the vertex of a part projected from the transparent substrate 22, the first slope 26 has a first angle θ<SB>1L</SB>representing inclination of the first slope to a normal direction perpendicular to a surface of the transparent substrate 22, the second slope 27 has a second angle θ<SB>1R</SB>representing inclination of the second slope 27, the respective angles θ<SB>1L</SB>, θ<SB>1R</SB>are set to refract light made incident from one side to the boundary to the normal direction perpendicular to a surface of the transparent substrate on the first slope and to refract light made incident from the other side to the normal direction on the second slope. <P>COPYRIGHT: (C)2009,JPO&INPIT |
