Focus voltage control apparatus

Details Focus voltage control apparatus Focus voltage control apparatus

1994-01-19

1995-07-25

Groody, James J.

Television

Video display

Cathode-ray tube

348807, 3153821, 315382, H04N 326, H04N 928

Patent

active

054366771

ABSTRACT:
A focus voltage control apparatus adapted for a color CRT and capable of achieving a just focused state of any desired color even in monochromatic display. Red, green and blue color signals R, G, B are integrated per horizontal line period in integrating/peak holding circuits and then are weighted respectively in weight control circuits. Subsequently the maximum one of the color signals is detected in a comparator, and one of color selection signals SR, SG, SB is outputted in accordance with the result of such detection and then is supplied to focus voltage converters for the individual colors. A reference focus voltage refV is converted into a color focus voltage VR, VG or VB on the basis of the color selection signal SR, SG or SB for just focusing the color signal R, G or B. One of such focus voltages is supplied to a focus voltage driver and then is shifted to a higher-level focus voltage V which is supplied to a CRT, whereby the maximum one of the entire color signals included in the input video signal is displayed in a just focused state.

REFERENCES:
patent: 3396304 (1966-02-01), Wilson
patent: 3961223 (1976-06-01), Ray et al.
patent: 4387394 (1983-06-01), Powell
patent: 4633144 (1986-12-01), McKiffen
patent: 4709262 (1987-11-01), Spieth et al.

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