Keyboard with power saving function and data storage capabilitie

Details Keyboard with power saving function and data storage capabilitie Keyboard with power saving function and data storage capabilitie

1997-05-16

2000-06-06

Chow, Dennis-Doon

Computer graphics processing and selective visual display system

Display peripheral interface input device

Including keyboard

345172, 341 22, 341 26, 713320, G09G 500

Patent

active

060724722

ABSTRACT:
A keyboard for reducing the power consumption of the controller when scanning the keys in the key matrix and/or transmitting the key codes of operated keys. The operation mode of the keyboard is switched from the normal mode to the stop mode to stop the operation of the clock signal generator and the operation of the controller including the generation of a scan signal for the key matrix when all keys arranged in the key matrix are held in the key-off state for longer than a predetermined period of time, for example five seconds, after any of the keys has been operated or when any of the keys in the key matrix has been keyed on and held in the key-on state for longer than a predetermined period of time, for example 60 seconds.

REFERENCES:
patent: 4527917 (1985-07-01), Ueno
patent: 4680572 (1987-07-01), Meguire et al.
patent: 4694280 (1987-09-01), Rollhaus et al.
patent: 5331337 (1994-07-01), Kabeya et al.
patent: 5371693 (1994-12-01), Nakazoe
patent: 5384721 (1995-01-01), Joto
patent: 5450080 (1995-09-01), Irwin
patent: 5539400 (1996-07-01), Mears
patent: 5684471 (1997-11-01), Bernardi et al.
patent: 5818437 (1998-10-01), Grover et al.

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