Light emitting diode matching by photovoltaic response

摘要

Disclosed is a method and device that may respond to the application of a uniform light source to a plurality of light emitting diodes. An electrical signal generated by each of the respective light emitting diodes in the plurality of light emitting diodes in response to the applied uniform light may be measured. The electrical signal may be measured by a sensing circuit. An adjusted drive signal generated based on a calibration value may be applied to each of the respective light emitting diodes.

主权项

1. A method comprising:
directly exposing a plurality of light emitting diodes to incident uniform light from a light source that is external to the plurality of light emitting diodes; measuring, at a respective light emitting diode of the plurality of light emitting diodes and while directly exposing the plurality of light emitting diodes to the incident uniform light, an electrical signal generated by the incident uniform light,
wherein the measured electrical signal is measured by a sensing circuit electrically coupled to the respective light emitting diode; determining a calibration value for the respective light emitting diode based on the measured electrical signal; and storing the calibration value in a memory device.