Digital convergence apparatus

Details Digital convergence apparatus Digital convergence apparatus

1996-08-06

1998-08-11

Hsia, Sherrie

Television

Video display

Cathode-ray tube

348806, 31536813, 31536812, H04N 928

Patent

active

057934479

ABSTRACT:
A field memory stores convergence adjusting data which corresponds to a plurality of points on a display screen. An interpolation calculation circuit creates interpolation convergence adjusting data for correction points located between adjacent adjusting points, using a plurality of adjusting data items and interpolation coefficients. The output of the interpolation calculation circuit is subjected to digital/analog conversion and passed through a low-pass filter, thereby forming a convergence correction signal. This correction signal is supplied to each deflection coil. At the time of creating interpolation adjusting data for a point located between adjusting points, an optimal interpolation coefficient is output from a ROM or a ROM, depending upon whether the point is included in the odd or even field.

REFERENCES:
patent: 4977446 (1990-12-01), Shiomi et al.
patent: 5506481 (1996-04-01), Wada
patent: 5592240 (1997-01-01), Sakamoto
patent: 5694181 (1997-12-01), Oh

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