METHOD FOR CONTROLLING OPERATIONS OF INPUT DEVICE HAVING RESISTOR MATRIX

摘要

A method for controlling an input device is provided. The input device has a resistor matrix having M first traces, N second traces and M×N resistors. Each second trace is coupled to a reference resistor and M−1 variable resistors. M and N are integers greater than 1. A first voltage level of each second trace is measured when a first voltage is applied to a first end of the reference resistor and a second voltage is applied to first ends of the M−1 variable resistors via the M first traces. Variations of the first voltage level of each second trace are measured, such that it could be determined whether any touch point of the input device exists according to the variations of the first voltage level of each second trace.

主权项

1. A method for controlling operations of an input device, the input device comprising a resistor matrix having M first traces, N second traces and M×N resistors, first ends of resistors of a same column being connected to one of the M first traces, second ends of resistors of a same row being connected to one of the N second traces, and each second trace being coupled to a reference resistor and M−1 variable resistors, M and N being integers greater than 1, the method comprising:
measuring a first voltage level of the each second trace when a first voltage is applied to a first end of the reference resistor and a second voltage is applied to first ends of the M−1 variable resistors via the M first traces; measuring variations of the first voltage level of the each second trace; and determining at least one touch point of the input device according to the variations of the first voltage level of the each second trace.