Brightness enhancement film with diffusion function

The utility model discloses a brightness enhancement film with a diffusion function, which comprises a brightness enhancement film main body, a mounting groove is arranged on one side of the brightness enhancement film main body, a diffusion film is arranged in the mounting groove, a fixed seat is fixed outside one side of the brightness enhancement film main body, a movable block is arranged in the fixed seat, and the movable block is arranged in the mounting groove. A limiting rod is fixed to the outer wall of the end, close to the mounting groove, of the movable block, a pushing block is fixed to the outer wall of the end, away from the brightness enhancement film body, of the movable block, a first spring is arranged in the fixing base, a positioning plate is fixed to the outer wall of the diffusion film, and an ejection piece is arranged at the lower end of the mounting groove. Through mutual cooperation of a fixed seat, a movable block, a limiting rod, a push block, a first spring and a positioning plat