Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1991-08-15
1993-12-28
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2970, H01J 2976
Patent
active
052743071
ABSTRACT:
A single IC chip, eight channel, correction waveform generator for CRT displays is disclosed. Each channel may output a different waveform to correct a different form of raster distortion. A correction waveform is developed for each type of display distortion. For each correction waveform eight correction waveform segments spaced over the vertical scan cycle are then selected and nine values on each waveform segment are digitally stored in the chip for each channel. The chip generates a corrective waveform segment per channel for each horizontal scan line in the display by serially horizontally interpolating values for the intervals between the selected nine values. This horizontal interpolation uses weighted sum equations applied to the closest four known waveform segment values around the interval to produce interpolated values lying on curves between the selected values. In order to obtain known waveform values for horizontal scan lines not having selected and stored waveform values corresponding thereto, linear vertical interpolation is performed to supply the known values for horizontal interpolation. Careful selection of numerical weights in the weighted sums equations, and the need for few known values to solve the interpolation equations, lead to reduced hardware requirements within the IC. Great control over CRT display correction is thus obtained with a minimal number of specified correction values.
REFERENCES:
patent: 4203051 (1980-05-01), Hallett et al.
patent: 4354143 (1982-10-01), Judd
patent: 4422019 (1983-12-01), Meyer
patent: 4680510 (1987-07-01), Spieth et al.
patent: 4687973 (1987-08-01), Holmes et al.
patent: 4871948 (1989-10-01), Nelson
Blum Theodore M.
Norris Roland W.
Zenith Electronics Corporation
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