Colour picture tube, colour picture reproducing equipment and picture display method with such an equipment

摘要

A color picture tube comprising three electron-gun systems, in which on the shadow mask or a part connected thereto, phosphorescent marks are attached to the rear side thereof. These marks can be used for checking the exact position of the electron beams during adjustment. By suitably delaying the chrominance signals it is possible to improve the E-W convergence.