CRT focus correcting method, CRT focus correcting circuit and di

Details CRT focus correcting method, CRT focus correcting circuit and di CRT focus correcting method, CRT focus correcting circuit and di

1997-11-19

2000-05-30

Lee, Michael H.

Television

Video display

Cathode-ray tube

348745, 3153821, 315382, H04N 322, H04N 326

Patent

active

060696737

ABSTRACT:
A CRT focus correcting method and correcting circuit are arranged as follows. Size data of a picture size set externally are compared with size data of a reference picture size, and when it is detected that a picture size has been changed, calculation correction data are obtained based on reference correction data and both the size data. When a parabola waveform voltage based on the calculation correction data is applied to a focus coil, a CRT focus is corrected according to a change in the picture size.

REFERENCES:
patent: 4039899 (1977-08-01), Battjes et al.
patent: 5301025 (1994-04-01), Hatano et al.
patent: 5455492 (1995-10-01), Turnbull

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