Patent ID: 6861121

Claim:
An optical diffusing layer comprising a resin coated layer having a surface fine concavo-convex structure which is formed by particles having a particle size of 2 to 5 μm, wherein an average of peak-to-peak distance (Sm), an average of center line surface roughness (Ra), and an average of ten-point surface roughness (Rz) on the surface with fine concavo-convex structure satisfy following equations: Sm≦ 80 μm, 0.1 ≦Ra≦ 0.17 μm, and Rz≦ 9 Ra, said optical diffusing layer further comprising a low refractive index layer having a refractive index lower than a refractive index of the resin coated layer disposed on the concavo-convex structure surface of the resin coated layer.