Backlight module having brightness enhancement design at periphery of display surface

A backlight module comprising:

• a supporting plate having a supporting surface;
• a light source module comprising a plurality of light sources disposed on the supporting surface, the plurality of light sources comprising a periphery light source disposed closer to an edge of the supporting surface than other light sources;
• and
• an optical modulation film disposed above the light source module and having a plurality of light exiting holes, light generated from the light source module being distributed by the optical modulation film and emitting via the plurality of light exiting holes at different positions;
• wherein the optical modulation film has a periphery area and a central area;
• the periphery area and the central area form a periphery projecting area and a central projecting area on the supporting surface, respectively;
• the central area and the central projecting area are relatively parallel to each other in comparison with the periphery area and the periphery projecting area;
• the periphery light source has a light source projecting position formed on the optical modulation film;
• when a distance between the light source projecting position and a position in the periphery area disposed along a direction toward a peripheral edge of the optical modulation film is increased, a perpendicular distance between the position in the periphery area and the supporting surface is increased, and at least a corner of the optical modulation film is curved away from the supporting surface in each of a length and a width direction of the optical modulation film such that the perpendicular distance between the periphery area and the supporting surface increases along directions towards a vertex position of the at least a corner of the optical modulation film.