Faculty Advisor

Bitar, Stephen John


The purpose of this project was to demonstrate as a proof of concept that LED emitters within outdoor video displays can also be utilized as optical feedback sensors for self-calibration. The emission and sensing characteristics of new and degraded LEDs were measured and studied to determine the effectiveness of using LEDs as sensors. A small-scale, adjustable LED driver with a closed-loop feedback control system was designed to illustrate self-calibration without extra sensing components. LED current was automatically adjusted to maintain proper LED brightness and color, while utilizing an adjacent LED as a sensor. Test results show that the self-calibration control system is viable and effective. Further work is necessary to determine system proficiency for large scale LED video displays


Worcester Polytechnic Institute

Date Accepted

March 2010


Electrical and Computer Engineering

Project Type

Major Qualifying Project



Advisor Department

Electrical and Computer Engineering