Display range control apparatus and external storage unit...

G - Physics – 09 – G

Patent

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Details

G09G 5/36 (2006.01) A63F 9/24 (2006.01) A63F 13/00 (2006.01) G09G 5/14 (2006.01) H04N 5/272 (2006.01)

Patent

CA 2055702

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 a 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, by a gate circuit. The picture data which outputted from the gate circuit is converted into a video signal which is then applied to the monitor.

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