Hitachi, Ltd.

Katsuyuki Kawakami

Hiroshi Yoshioka

Soichi Sakurai

Hiroshi Jitsukata

Yoshio Satoh

A cathode-ray tube display unit provided with a high voltage transformer for supplying high voltage to an anode of a cathode-ray tube, a deflection yoke having a horizontal deflection coil and a vertical deflection coil, and an interior conductive coating formed on the inside of a glass vessel of the cathode-ray tube, in which there is provided an electrode in the conductive coating form formed on an external wall face of a glass vessel at a funnel portion being electrically separated from an exterior graphite coating formed on an external surface of the cathode-ray tube and connected to ground, and a circuit for applying reverse pulse voltage V.sub.1 that satisfies (V.sub.0 .times.C.sub.0)&gt;(V.sub.1 .times.C.sub.1) to the electrode in the conductive coating form is included. Where, it is assumed that flyback pulse voltage supplied to the deflection yoke means is V.sub.0, reverse pulse voltage having a polarity reverse to that of voltage generated in the interior conductive coating is V.sub.1, electrostatic capacity between the horizontal deflection coil and the interior conductive coating is C.sub.0, and electrostatic capacity between the electrode in the conductive coating form and the interior conductive coating is C.sub.1.

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Yokohama, Japan

Katsuyuki Kawakami