Patent ID: 7674008

Claim:
A back-light source comprising: a first surface and an opposing second surface; a plurality of light emitting elements, wherein at least some of the light emitting elements comprise: a first end located adjacent to the second surface; an opposing second end facing the first surface; a device body made substantially of an optical material, the device body comprising an optical axis substantially perpendicular to the first surface, a first plane containing the optical axis and a different second plane containing the optical axis; and a light emitting component located at the first end, wherein the device body further comprises a light directing surface at the second end along the optical axis to direct light emitted by the light-emitting component, and wherein the light directing surface has different radii of curvature in different directions such that the radius of curvature in a first plane is greater than the radius of curvature in a second plane so as to provide different focal distances.