Calibration of Abnormal Brightness Area on the LED Display

Abstract

Due to the collection method, the acquisition environment and the LED’s own light-emitting characteristics, the effect of LED point-by-point brightness correction will be affected, which results in the abnormal brightness area on the display. In this paper, a calibration method based on the brightness correction coefficient map is presented, which uses the step-by-step weighted shrinkage algorithm to post-process the correction coefficient in order to eliminate the abnormal area on the screen. The result showes that uniformity of the entire LED display is greatly improved and the deviation decreases from 12.86% before correction to the present 2.39%.