Color characterization model for OLED displays with crosstalk effects

Abstract

Conventional models (e.g., a Gain-Offset-Gamma model) were developed based on the assumption of channel independence. Modern displays (e.g., organic light-emitting-diode OLED displays), however, sometimes have crosstalk effects among the three channels, making these conventional models have poor performance. In this article, we propose a 3D piecewise model. It divides the display gamma encoded RGB space (i.e., R′G′B′) into 27 subspaces and characterizes the crosstalk effects between two and three channels based on the measurements of the tristimulus values of 64 combinations of digital signal values. The average color difference ΔE₀₀ of the 41 combinations between the model predictions and the measurements was around 0.34, in comparison to the average of 3.61 by the GOG model, across nine uncalibrated OLED displays. In addition, for displays with breakpoints on each channel, a revision is proposed to divide the subspaces for maintaining the accurate predictions. The proposed model was also validated by calibrating 94 uncalibrated OLED displays to the standard P3 RGB specifications, resulting an average color difference ΔE₀₀ reduced from 3.96 to 0.72.