Apparatus for driving a resistance film type input device

Details Apparatus for driving a resistance film type input device Apparatus for driving a resistance film type input device

1994-11-14

1996-08-27

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

178 19, 178 20, 345173, 345174, G08C 2100

Patent

active

055503292

ABSTRACT:
There are provided a first transistor for applying voltage to the Y-axis electrode, a second transistor for applying voltage to the Y-axis electrode and discharging electric charges accumulated at the Y-axis electrode, a third transistor for applying voltage to the X-axis electrode, and a fourth transistor for applying voltage to the X-axis electrode and discharging electric charges accumulated at the X-axis electrode. The voltage applied to the Y-axis electrode and the X-axis electrode during the waiting time are made to take the form of pulses, and when the voltages applied to the Y- and X-axis electrodes are simultaneously turned off, the Y- and X-axis electrodes are connected to the signal ground to discharge the electric charges accumulated at the Y- and X-axis electrodes. As a result, the coordinate deviation, which is caused by seasonal change of the resistance value by heat accumulation of the resistance film, can be prevented, and the erroneous detection of the coordinate, which is caused by the electric charges accumulated at the Y- and X-axis electrodes, can be prevented.

REFERENCES:
patent: 4055726 (1977-10-01), Turner et al.
patent: 4575580 (1986-03-01), Jandrell
patent: 4594589 (1986-06-01), Ohba et al.
patent: 5225636 (1993-07-01), Protheroe
patent: 5266750 (1993-11-01), Yatsuzuka
patent: 5324895 (1994-06-01), Inamori et al.
patent: 5367130 (1994-11-01), Isono

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