Bi-directional scan switch matrix method and apparatus

Computer graphics processing and selective visual display system – Display peripheral interface input device – Including keyboard

Reexamination Certificate

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Details

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.

REFERENCES:
patent: 4138917 (1979-02-01), Sakashita et al.
patent: 4266213 (1981-05-01), Renschke
patent: 4673933 (1987-06-01), Bauer
patent: 5677687 (1997-10-01), Valdenaire
patent: 6417787 (2002-07-01), Hsu
patent: 0 441 129 (1991-08-01), None
patent: 356027438 (1981-03-01), None
patent: 404026226 (1992-01-01), None
English abstract of Fuldner et al., EP 0441129A1 (original previously cited).

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