(57) By using in a colour display tube a colour selection electrode comprising a metal
plate having a large number of rows of apertures which are separated from each other
by bridges and are elongate in the direction of the rows, which rows extend in the
direction of the phosphor lines on the display screen and in which the last aperture
at the two ends of each row is at least as long as the penultimate aperture at the
two ends of each row and the short sides of the last aperture of all rows situated
at the extreme ends are situated on curved lines which follow the edge of the colour
selection electrode, a smooth picture edge and also a good adhesion of the ends of
the phosphor lines to the display window are obtained.
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