Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1994-10-11
1997-05-27
Brier, Jeffery
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345123, 345163, G09G 508, G09G 534
Patent
active
056336578
ABSTRACT:
A mouse driver arrangement combining a first functional block, comprising a scrolling-rate function generator for generating a time-dependent scrolling-rate control signal of pre-defined shape, whose output cycle is a function of the activation status of one or more mouse push-buttons, plus a second functional block, comprising a cursor trail analyzer for detecting a dominant direction in a cursor trail and setting a scrolling direction option accordingly. The scrolling-rate function generator includes an integrator for producing ramp-like scrolling-rate control signal segments of adjustable slopes under control of the mouse push-buttons. The output of both first and second functional blocks are combined in a scrolling-vector status variable, whose magnitude is controlled by the scrolling-rate function generator and represents the scrolling rate, and whose direction is set by the cursor trail analyzer and represents the scrolling heading.
REFERENCES:
patent: 4720703 (1988-01-01), Schnarel, Jr. et al.
patent: 5075673 (1991-12-01), Yanker
patent: 5313229 (1994-05-01), Gilligan et al.
patent: 5374942 (1994-12-01), Gilligan et al.
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