Dynamic focus circuit and display using the same

Details Dynamic focus circuit and display using the same Dynamic focus circuit and display using the same

1996-11-26

1999-09-21

Ho, Tuan

Television

Video display

Cathode-ray tube

330310, 348326, 315382, H04N 568

Patent

active

059560991

ABSTRACT:
A circuit for clipping a dynamic focus voltage waveform during a horizontal retrace time is provided so as to prevent an unnecessary voltage from occurring during the retrace time. A high gain amplifier for amplifying horizontal and vertical parabolic waves is provided with an output circuit used as an emitter follower, a D.C. feedback circuit and a boot strap circuit composed of a capacitor. As a result, a display can be provided which is capable of performing a large amplitude operation without increasing power losses, realizing a satisfactory frequency response simultaneously with the amplitude operation and providing excellent focus properties over the entire screen thereof.

REFERENCES:
patent: 4302727 (1981-11-01), Iwamatsu
patent: 5017844 (1991-05-01), Lendaro
patent: 5146142 (1992-09-01), Van Tol
patent: 5532558 (1996-07-01), George
patent: 5663617 (1997-09-01), Kobayshi

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