WIDE-ANGLE EMISSION LENS FOR LED USEFUL FOR BACKLIGHTING

摘要

PROBLEM TO BE SOLVED: To provide a light-emitting diode (LED) and a fixed lens design, and to provide a technique for forming a lens on top of an LED die.

SOLUTION: Lenses and certain fabrication techniques are described. A wide-angle emission lens refracts light emitted by an LED die to cause a peak intensity to occur within 50 to 80 degrees off the center axis, and the intensity along the center axis is to be between 5% and 33% of the peak intensity. The lens is particularly useful in a LCD backlighting applications. In one embodiment, the lens is affixed to the backplane on which the LED die is mounted and surrounds the LED die. The lens has a hollow portion that forms an air gap between the LED die and the lens, where the light is bent towards the sides both at the air gap interface and the outer lens surface interface. The lens may be a secondary lens that surrounds an interior lens directly molded over the LED die.

COPYRIGHT: (C)2007,JPO&INPIT