The present invention disclose a composite structure for light diffusion, including at least one carrier media layer and a microlens system comprising a plurality of microlenses thereon. A transparent material for enlarging the shape is coated on each microlens to cover the gaps between the microlens. Partial surface of the transparent material can be coated a light absorbing layer for glare reduction. Besides, the microlens can be or asymmetric or arranged in random, non-periodic array for interference reduction.