Fast scanning switch matrix

Details Fast scanning switch matrix Fast scanning switch matrix

1997-03-31

1999-02-16

Hofsass, Jeffery A.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Including keyboard

345173, 341 22, 341 26, G09G 500

Patent

active

058725610

ABSTRACT:
Driving circuitry for a switch matrix provides a reset voltage to all rows of the matrix in between scans to recharge switch capacitance. Column detection circuitry is disabled in between scans so that column driving circuitry may also `reset` the charge on capacitors reducing the scan time and/or allowing a greater number of switch elements, element size, or EMI suppressing capacitances. Pull-up resistors are supplemented or eliminated through the use of active current sourcing and sinking for the drivers.

REFERENCES:
patent: 4143253 (1979-03-01), Wagner et al.
patent: 4665461 (1987-05-01), Bader
patent: 5151554 (1992-09-01), Matsuda
patent: 5430443 (1995-07-01), Mitchell
patent: 5486824 (1996-01-01), Kinerk et al.
patent: 5552568 (1996-09-01), Onadaka et al.
patent: 5677687 (1997-10-01), Valdenaire

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