A Direct-Reading Colorimeter for Color-Television Picture Tubes

An instrument for measurement of color of cathode ray tube screens has been developed and evaluated. It consists of four filters and photocells coupled to a special purpose analog computer with readout directly in C.I.E. x and y on a pair of digital panel meters. Accuracy is within one percent of the spectroradiometer used for calibration. Possible future developments and applications include set-up and tracking white on color receivers, measurement in terms of C. I. E. uniform chromaticity system and, perhaps, incorporation of direct readout in brightness.