Student Work

UTILIZING LEDs AS FEEDBACK SENSORS FOR VIDEO DISPLAYS

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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.
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Identifier
  • E-project-030810-142714
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Year
  • 2010
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Date created
  • 2010-03-08
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