Lens with diffusion structure and backlight module incorporating the same

A backlight module comprising:

• an LED light source;
• and
• a lens optically coupled to the LED light source, comprising a main lens body comprising a light incident face from which light generated by the LED light source enters the lens and a light exit face opposite to the light incident face thereof, and a diffusion structure having a plurality of micro lenses formed on the light exit face of the main lens body, the light generated by the LED light sources leaving the lens from the light exit face;
• wherein each micro lens is annular, and the micro lenses are arranged in a series of concentric circles with regard to a center point located on an optical axis of the main lens body of the lens;
• wherein each micro lens comprises a first light scattering surface and a second light scattering surface intersecting with the first scattering surface, the first and second light scattering surfaces are inclined relative to the optical axis of the main lens body of the lens, and the LED light source faces the light incident face of the main lens body of the lens;
• and
• wherein an angle defined between the first and second light scattering surfaces of each micro lens increases gradually along a radial direction perpendicular to the optical axis of the main lens body from a center toward an outer periphery of the light exit face of the main lens body, the first light scattering surface intersected with the optical axis of the main lens body of the lens forms a concave surface.