Display range control apparatus and external storage unit for use therewith
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United States of America Patent
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Dec 24, 1996
Issued Date -
N/A
app pub date -
Apr 13, 1994
filing date -
Nov 17, 1990
priority date (Note) -
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Abstract
A display range control apparatus includes an external storage unit in which position data representative of two points in a horizontal direction on a screen of a raster scan monitor are stored in advance together with still picture pattern data and character data. A counter is incremented for each dot or pixel on the screen. In a range where each of the position data is coincident with a count value of the counter, a masking signal is obtained. The masking signal is used for gating picture data using a gate circuit. The picture data outputted from the gate circuit is converted into a video signal which is then applied to the monitor.
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