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The glass transmission of a CRT determines the compromise between two perceptual parameters that are of key importance: the brightness and the daylight contrast. Thus the picture quality of a CRT strongly depends on the glass transmission. This paper explains how optimal picture quality under varying ambient illumination can be achieved with user‐adjustable glass transmission. The two variable transmission technologies that are currently investigated by Philips, i.e. photochromics and electrochromics, are discussed.