Backlight module, optical module and optical film of liquid crystal display

The utility model discloses a backlight module, an optical module and an optical film of a liquid crystal display. The optical film comprises a rectangular transparent substrate and a functional element. A plurality of through holes which are perpendicular to the transparent substrate are arranged on the transparent substrate, wherein the arrangement densities of the through holes in the corner areas, the edge areas and the central area of the transparent substrate are sequentially and gradually decreased. Since the through holes are arranged on the transparent substrate and heat emitted by lamp arrays is dissipated through the through holes, the utility model has the advantages that the heat received by the optical film is reduced, the expansion extent of the optical film is further reduced, the wrinkles are correspondingly reduced and the display quality of the liquid crystal display is improved.