| 摘要 |
<p>A light control film, with an uneven pattern on one face, having appropriate diffusibility and without problem of dazzle is available by providing the pattern with a predetermined condition. Front brightness of the film can be reliably increased with use of less optical film. The predetermined condition is that, with respect to any cross section perpendicular to a reference face, the average (thetaave(degree)) of the absolute values of inclination of curves (hereafter referred to as cross-sectional curves) at a cross-sectional end portion defined by the unevenness pattern is between (78 - 34n) degrees or more and (118 - 34n) degrees or less with n the refraction factor of the material forming the film, or the absolute value of the average of inclination of the cross-sectional curves and a ratio (L2/L1) of a length (L2) of the cross-sectional curves to a length (L1) of the straight line defined by the intersection of the reference face and the cross section satisfies the following expression (3) or (4) in substantially all cross sections. (thetaave/Lr) x n<2> >= 40 (3) 50 <= &THETAS;ave X Lr X n<2 ><= 135 (4)</p> |
