Voltage offset device and method for providing a smooth scroll for a raster scan cathode ray tube display
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United States of America Patent
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-
Mar 31, 1987
Grant Date -
N/A
app pub date -
Jan 30, 1985
filing date -
Jan 30, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A device and method for providing a smooth scroll of a display on a cathode ray tube display device having a display area, horizontal deflecting means receiving horizontal drive pulses for effecting horizontal scans, vertical deflecting means receiving vertical drive pulses for moving said video display vertically, and a video input for receiving a video input signal. The device includes a microprocessor having an input and an output. The microprocessor counts, and places on its output, digital signals corresponding to its count. A digital-to-analog converter converts the digital signals to an analog signal. A summing device is connected between the digital-to-analog converter output and the vertical deflecting means of the cathode ray tube display device for summing a vertical deflection pulse and the analog signal output of said digital-to-analog converter, thereby vertically displacing the video input signal of the cathode ray tube display device.
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