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.