Analysis of white point and phosphor set differences of CRT displays

There are a variety of CRT phosphor sets used to display color information. In addition, the white point, achieved when the red, green, and blue phosphors are excited by beam currents corresponding to the maximum digital count for each primary, is not standardized. Displaying a file containing RGB digital values on unlike monitors, with different phosphors and/or white points, would produce different colors. Computer stimulations were conducted to compute the colors for CRTs with different phosphor sets and constant white points and for different white points with contant phosphor sets. Test results demonstrated that CIE‐LAB color differences were larger when the phosphor sets were different. Smaller color differences resulted from differences in white point, assuming a constant phosphor set. Overall average color differences were reasonably represented by a linear relationship to the average color difference between the phosphors. A linear relation was also found between the average color differences and the color differences between the white points. It was concluded that phosphor differences contribute more to color differences, and therefore standardization efforts should focus first on adopting a color phosphor set, and secondly on a white point.