Use the current optical materials (Polarizing plate , Diffusion film, ITO film, Brightening film to conduct the cutting process, generally use the shim with PET material to conduct stamping, although the PET has stronger rigidity, it will be more leveled when laying flat, with strong rigidity the toughness is also relatively less, so during stamping, it has to have a deeper tool mark, also the bumps extruded on the PET Shim surface produced by the tool mark when stamping, those bumps are fatal for the optical grade products.