| 摘要 |
A color display device comprises an electron gun, a display screen and a color selection electrode as well as a deflection means. The distance between the electron beams is dynamically varied, i.e. the distance between the electron beams in the deflection plane decreases as the beams are deflected in at least one direction. The decrease of the distance enables the distance between the color selection electrode and the display screen to be increased in that direction. As a result, the curvature of the color selection electrode is increased, which has a positive effect on the strength, doming and microphonics of the color selection electrode. The distance is dynamically varied by first and second means, the first means being arranged in or near the pre-focusing parts of the electron gun. Said first means comprise magnetic means outside the neck of the CRT for generating dynamically varying magnetic fields, and magnetic field conducting means to conduct the fields to a position near the electron beams.
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