Lens with diffusion structure and backlight module incorporating the same

摘要

A lens for an LED backlight module includes a main lens body and a diffusion structure consisting of a plurality of micro lenses. The main lens body includes a light incident face for receiving light from an LED light source and a light exit face opposite to the light incident face thereof. Light leaves the lens from the light exit face. The micro lenses of the diffusion structure are formed on the light exit face of the main lens body. Each micro lens is annular and has a generally triangular cross section. Each micro lens includes a first light scattering surface and a second light scattering surface intersecting with the first light scattering surface. The micro lenses are arranged in a series of concentric circles with regard to a center of the lens. A backlight module source incorporating the lens and the LED light source is also provided.

主权项

1. A lens for an LED (light emitting diode) backlight module comprising:
a main lens body comprising a light incident face configured for receiving light from an LED light source 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; 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, and the first light scattering surface and the second light scattering surface are both inclined relative to the optical axis 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.