LED array package with internal feedback and control

Details LED array package with internal feedback and control LED array package with internal feedback and control

2007-08-07

2007-08-07

Luebke, Renee (Department: 2875)

Illumination

Light source and modifier

With ventilating, cooling or heat insulating means

C257S099000, C257S088000

Reexamination Certificate

active

10894185

ABSTRACT:
A packaged LED array for high temperature operation comprises a metal base, the metal base including an underlying thermal connection pad. One or more layers of ceramic overly the metal base. The array includes a plurality of LED dice, each LED die having electrodes. And, the LED thermally coupled to the metal base. A driver circuit is electrically connected to the LED die electrodes and controls the LED array current. An LED driver is mounted within the LED array package, and thermally coupled to the metal base. In a second embodiment, one or more of the LED dice can be switched from the driver to a measurement circuit and used as a photodetector to measure the light output of the LED array. The measured photodetector signal can further be used as a feedback signal to control the LED array light output.

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