Colour display device

A colour display device, with an electron beam source and with an arrangement of pixels defined by either blue or green or red-luminescing material, and including means for exciting the pixels, the exciting means being operable for scanning the pixel arrangement with excitation pulses under line at a time scanning conditions. The luminance of such a colour display device is enhanced at a given radiation power and the linearity of the luminance is improved in dependence upon the electron energy density by using luminescent materials at least two of which have a luminescence decay time shorter than the excitation pulse time.