Evaluation of current-sensitive color CRT screens

The most important properties of phosphors used in mixed phosphor screens for current-sensitive color CRTs are emission linearity, luminance, chromaticity, spectral energy distribution, and stability. The evaluation of experimental phosphors can be readily carried out in a demountable CRT system but precautions must be taken to minimize possible errors. In order to eliminate much of the trial-and-error evaluation of phosphor mixtures, an equation has been derived which can be used to calculate the ratio of two phosphors which will give the maximum color shift from measurements on the individual phosphors. Good correlation has been obtained between measured and calculated color shifts.