Color display system and cathode-ray tube

Details Color display system and cathode-ray tube Color display system and cathode-ray tube

H - Electricity

04

N

350/76.1, 313/35

H04N 9/12 (2006.01) H01J 29/50 (2006.01)

Patent

CA 1245344

Abstract A color display system includes a cathode-ray tube and self-converging yoke that produces an astigmatic magnetic deflection field within the tube. The tube has an electron gun for generating and directing three electron beams along paths toward a screen. The gun includes beam-forming region electrodes, main focusing lens electrodes, and two electrodes for forming a multipole lens between the beam-forming region and the main focusing lens in each of the electron beam paths. Each multipole lens is oriented to provide a correction to an associated electron beam to at least partially compensate for the effect of the astigmatic magnetic deflection field on that beam. A first multipole lens electrode is located between the beam forming region electrodes and the main focusing lens electrodes. A second multipole electrode is connected to a main focusing lens electrode and located between the first multipole lens electrode and the main focusing lens, adjacent to the first multipole lens electrode. Means are included for applying a fixed focus voltage to the second multipole lens electrode and a dynamic voltage signal, related to the deflection of the electron beams to the first multipole lens electrode. Each multipole lens is located sufficiently close to the main focusing lens to cause the strength of the main focusing lens to vary as a function of voltage variation of the dynamic voltage signal.

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