Method of testing control matrices employing distributed source

Details Method of testing control matrices employing distributed source Method of testing control matrices employing distributed source

1992-05-13

1993-09-07

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324 731, G01R 3102

Patent

active

052432726

ABSTRACT:
A test method for a switch matrix (10) of a liquid-crystal display employs a signal source (40, 42) to drive a row line (20) of the matrix and employs current sensors (56, 58, and 60) to measure the resultant current flow. Errors are detected by observing departures of the measured currents from expected values. To increase the sensitivity of the current measurement to the capacitance in the location at which the associated column line (14, 16, or 18) intersects the driven row line (20), return connections for the source (40, 42) are made directly to the contact pads (26, 28) of the row lines not currently being driven and column lines not currently being sensed.

REFERENCES:
patent: 5057775 (1991-10-01), Hall
patent: 5073754 (1991-12-01), Henley

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