Patent ID: 7252408
Filing Date: 2007-08-07
Classification: F21K,F21V,H01L,H05B

Abstract:
1. A LED array package for high temperature operation comprising: a metal base; a thermal connection pad underlying the metal base; one or more ceramic layers overlying the metal base; a plurality of LED dice each having a pair of electrodes, the LED dice thermally coupled to the thermal connection pad through the metal base; a driver circuit mounted within the package and thermally coupled to the metal base, the driver circuit having output which controls a current supplied to the LED dice; a measurement circuit to measure a light output of the LED array; an electronic switch to switch a connection of one or more LED dice from the driver circuit to the measurement circuit, wherein when the one or more LED dice are disconnected from the driver circuit and connected to the measurement circuit, the one or more disconnected LED dice act as a LED photodetector thereby detecting a light output of the LED array, generating a measured signal and providing the measured signal to the measurement circuit; and a control circuit to accept the measured signal from the measurement circuit and control the LED array light output by adjusting the driver circuit output.