各向异性光学膜;ANISOTROPIC OPTICAL FILM

摘要

本发明系提供一种各向异性光学膜，于非扩散区域具有高直线穿透率，同时具有在MD方向及TD方向中之宽的扩散区域，而可解决所谓发生亮度急遽变化、眩光的问题。;该各向异性光学膜系积层有2层以上直线穿透率会随入射光角度而变化的各向异性光扩散层，其中，前述各向异性光扩散层之各者系具有基质区域、及折射率与该基质区域不同的复数个柱状区域；至少使用前述柱状区域的与配向方向垂直的剖面中之短径与长径的长宽比(长径/短径)不同的2种的各向异性光扩散层(a)及各向异性光扩散层(b)，作为前述各向异性光扩散层；前述各向异性光扩散层(a)之前述柱状区域的短径与长径的长宽比设为未达2；前述各向异性光扩散层(b)之前述柱状区域的短径与长径的长宽比设为2以上20以下的范围内。;The anisotropic optical film is obtained by laminating 2 or more layers of anisotropic optical diffusion layers which varies the straight line transparency along with the change of incident angle, wherein, each of the anisotropic optical diffusion layers has a base area, and a plurality of rod-like areas having a reflection index different from the base area. At least two kinds of anisotropic optical diffusion layer (a) and anisotropic optical diffusion layer (b) have different aspect ratio (long radius / short radius) of the cross-section of the rod-like area perpendicular to the orientation direction, are used as the anisotropic optical diffusion layer. The aspect ratio of the long radius to the short radius of the cross-section of the rod-like area of the anisotropic optical diffusion layer (a) is under 2. The aspect ratio of the long radius to short radius of the cross-section of the rod-like area of the anisotropic optical diffusion layer (b) is in the range of 2 to 20.