Backlight module

Abstract

A backlight module includes a light source assembly, a privacy film, a light-emitting element and a light guide plate. The light source assembly is adapted to emit a light beam. The privacy film is disposed on a transmission path of the light beam. The light guide plate is disposed on a side of the privacy film facing away from the light source assembly. The light guide plate has a light incident surface, a surface and a plurality of optical microstructures. The light incident surface is opposite to the light-emitting element. The surface faces the privacy film and is connected to the light incident surface. The optical microstructures are concave or protruding from the surface, and there is a height between each of the optical microstructures and the surface, wherein each height is decreased in a normal direction of the light incident surface.

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