Keypad and operation method thereof

Details Keypad and operation method thereof Keypad and operation method thereof

2005-09-01

2008-10-21

Edwards, Jr., Timothy (Department: 2612)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Including keyboard

C345S168000, C361S689000, C341S022000

Reexamination Certificate

active

07439960

ABSTRACT:
A keypad and operation method thereof is provided. In this embodiment, the keypad has pre-established corresponding tables (namely, key-signal tables) specifying key signals corresponding to various input keys on a keypad. A switching control key (i.e. a numeric-lock-key) is provided on the keypad to serve as the control key for switching one of the key-signal tables to another one to be used for retrieving the key signal. Therefore, when an input key (e.g. numeric/character key) is pressed, then a key signal corresponding to the pressed key is obtained directly from the key-signal table, and then is transmitted to the digital device to executing specific action or display. Therefore the problem of numeric locking synchronism between the numeric keypad and the computer keyboard is solved.

REFERENCES:
patent: 5402121 (1995-03-01), Noorbehesht
patent: 6040977 (2000-03-01), Hoffer
patent: 6174143 (2001-01-01), Horski et al.
patent: 6262716 (2001-07-01), Raasch
patent: 6545668 (2003-04-01), Hayama
patent: 7068499 (2006-06-01), Aisenberg

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