Patent ID: 8755005

Claim:
An apparatus comprising: a plurality of light emitting diodes; and a waveguide configured to be a backlight for a display, the waveguide having a front surface from which light is emitted from the waveguide, a back surface that is opposite the front surface, four side edges between the front surface and the back surface, and a center region between the four side edges, the back surface comprising a flat portion at the center region and four inclined portions that taper from the flat portion to the four side edges, the center region having a first thickness between opposing areas of the front surface and the back surface, the four side edges having a second thickness less than the first thickness, the waveguide having a plurality of cavities in the back surface at the center region into which the plurality of light emitting diodes are inserted and optically coupled to the waveguide to serve as a light source for the waveguide, the back surface comprising pits to direct light upward and provide a uniform light emission over the front surface.