The invention relates to an optical
diffusion barrier which comprises a substrate, a
diffusion layer and a back layer, wherein the
diffusion layer is
ultraviolet-cured on any one of the surfaces of the substrate by
coating solution comprising optical diffusion particles A, resin A and photo-initiator, wherein the resin A consists of
epoxy acrylate resin and
urethane acrylate with 8 degrees of functionality in the weight ratio of 1:9-9:1; the back layer is
ultraviolet-cured on the other surface of the substrate by
coating solution comprising optical diffusion particles B, resin B, photo-initiator and
antistatic agent, wherein the resin B consists of
pentaerythritol triacrylate and
caprolactone modified dipentaerythritol penta /
hexa-
acrylate in the weight ratio of 1:9-9:1; the optical diffusion particles A consist of
high polymer micro-spheres in particle sizes of 10-25 microns and
inorganic particles in the particle sizes of 1-4 microns, in the weight ratio of 2:1-4:1; the optical diffusion particles B are
inorganic particles in the particle sizes of 2-4 microns; and the
diffusion barrier has high
hardness, thin
coating layer and
high transmittance, full diffusion performance and good antistatic property and can meet the development direction of a
flat panel display in
large size,
thinning, light weight and low cost.