COLOR CATHODE RAY TUBE DRlVING CIRCUIT THEREF0R COLOR IMAGE REPRODUCING DEVlCE EMPLOYING THE DRIVING CIRCUIT AND COLOR IMAGE REPRODUCING SYSTEM INCLUDING THE COLOR IMAGE REPRODUCING DEVICE

摘要

PURPOSE: To provide a color cathode ray tube and its drive circuit usable in plural drive modes and performing both functions of a monitor including various information terminals and various types of color TV using one color television device, and the color television device and a television system using the same. CONSTITUTION: The voltages of a second grid electrode 23 and a first grid electrode 22 constituting an electron gun for the color cathode ray tube 20 and the cutoff voltage of a cathode 21 are combined in plural sets. These sets are changed over during operation.