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

• This report represents the work of one or more WPI undergraduate students submitted to the faculty as evidence of completion of a degree requirement. WPI routinely publishes these reports on its website without editorial or peer review.

Creator

• Renzulli, Eric Joseph
• Lee, Tuen Hung
• Cianfrocco, Daniel Paul

Publisher

• Worcester Polytechnic Institute

Identifier

• E-project-030810-142714

Advisor

• Bitar, Stephen John

Year

• 2010

Sponsor

• The New England Center for Analog and Mixed Signal

Date created

• 2010-03-08

Resource type

• Major Qualifying Project

Major

• Electrical & Computer Engineering

Rights statement

• In Copyright