Reduction of Luminance Errors Due to Line Load in a PDP With Limited Display Levels

The displayed level of a plasma display panel (PDP) is often different from the intended level because the luminance of a PDP is affected by the load (i.e., the number of turned-on cells). Previous methods have attempted to reduce the difference by predicting the luminance variation and compensating for the difference. The luminance prediction and error compensation are difficult with a PDP that displays a limited number of gray levels. This paper proposes a novel luminance prediction and error compensation algorithm for a PDP with limited display levels. It overcomes the shortcomings of the previous method by avoiding the gray errors caused by the luminance reverse that occurs when the luminance of a lower sub-field becomes larger than that of a higher sub-field. Furthermore, the prediction accuracy is improved by two additional schemes, load stabilization and prediction. The mean absolute error and maximum error of the proposed algorithm are reduced by 23.2% and 31.9%, respectively, compared with the previous method.