| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical sheet capable of effectively reducing both luminance unevenness as a whole and luminance unevenness at an edge. <P>SOLUTION: An optical sheet (1) that is arranged above a light source formed by alignment of multiple dotted light sources comprises: a sheet-like substrate (15); and a part (16) for controlling light permeability on at least one surface of the substrate (15). In a central region of the optical sheet (1), a non-permeable component ratio changes approximately periodically in a predetermined direction within a surface of the optical sheet (1). In a distribution chart of the non-permeable component ratio with a relative position within the surface of the optical sheet (1) in the predetermined direction on the abscissa and the non-permeable component ratio at the relative position within the surface of the optical sheet (1) on the ordinate, there are multiple peak values of non-permeable component ratio and bottom values thereof, and a difference between a maximum value and a minimum value of the non-permeable component ratio in an edge region of the optical sheet (1) is larger than the difference between a maximum value and a minimum value of the non-permeable component ratio in the central region. <P>COPYRIGHT: (C)2012,JPO&INPIT |
