| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a diffusion sheet which can reduce uneven brightness. <P>SOLUTION: Provided is the diffusion sheet in which light incident upon a sheet surface at a right angle is emitted, as emitted light, at a diffusion angle which periodically varies in a predetermined direction in the sheet surface. In a diffusion angle distribution diagram in which the abscissa represents relative positions in the sheet surface in the predetermined direction and the ordinate represents the diffusion angles at the relative positions in the sheet surface, a difference between a maximum value and a minimum value of the diffusion angles is 40° to 80°. <P>COPYRIGHT: (C)2010,JPO&INPIT |
