Colour display tube.

摘要

In a colour display tube of the post focusing type the colour selection means (7) consist of first lens electrode means (11) and second lens electrode means (12) situated at a short distance from each other. The second lens electrode means consist of a number of elongate conductors (12) or groups of conductors (12) extending parallel to each other. The conductors (12) or groups of conductors (12) are interconnected via a resistance material (19) as a result of which the energy released in an electric flash-over between the lens electrode means (11) and a conductor (12) in the flash-over point per unit of time is so small that the colour selection means (7) are not seriously damaged.