Computer graphics processing and selective visual display system – Display peripheral interface input device – Including keyboard
Reexamination Certificate
2006-04-18
2006-04-18
Chow, Dennis-Doon (Department: 2677)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Including keyboard
C341S022000
Reexamination Certificate
active
07030858
ABSTRACT:
A flexible and efficient apparatus and method of scanning switch matrix usable in user interface devices, e.g., a keypad or the like, having a number of switching elements, e.g., push buttons and/or switches, up to a twice the product of the number of rows and the number of columns. Each row and columns of the switch matrix are capable of being driven and being monitored during a scanning of the switch matrix for a presence of a closure of a switching element. The switch matrix device and the scanning method also allows integration of one or more switches in the switch matrix without the need for additional detection mechanisms dedicated to the switches.
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patent: 0 441 129 (1991-08-01), None
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English abstract of Fuldner et al., EP 0441129A1 (original previously cited).
Chow Dennis-Doon
Lucent Technologies - Inc.
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