Method and apparatus for scanning a key or button matrix

Details Method and apparatus for scanning a key or button matrix Method and apparatus for scanning a key or button matrix

2007-01-02

2007-01-02

Wong, Albert K. (Department: 2612)

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

C345S168000, C340S014100

Reexamination Certificate

active

10888666

ABSTRACT:
An improved key matrix scanning technique conducts a first pre-scan on a first array of connections in a key matrix to identify any activated keys or buttons associated with the first array. A second sub-scan is conducted on a second array of connections in the key matrix but only for the connections in the first array that are detected as having activated keys.

REFERENCES:
patent: 5274371 (1993-12-01), Yang et al.
patent: 5872561 (1999-02-01), Figie et al.

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