The optical diffuser films have the excellently optical properties, but the mechanical properties are very important information. Especially, the more lamps used to enhance brightness in direct type backlight unit let more heating to be created. This side thermal effect makes optical diffuser films to occur warps and wrinkles via thermal stress and it leads to poor uniform performance in brightness. Therefore, the mechanical properties of optical diffuser films are the significant parameters for design. advantages on the mechanical properties are determined by evaluation the optical diffuser films.
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