Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1995-11-13
1997-06-24
Powell, Mark R.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
178 19, G08C 2100
Patent
active
056421346
ABSTRACT:
A coordinate defining signal is applied to an counter electrode in a period different from a writing period of voltages to pixel electrodes, and detected by way of an electrostatic capacitive coupling to determine a coordinate. Concurrently, to avoid a malfunction due to noises, gate and source drivers have their operations interrupted in the non-writing period. To prevent a variation of the coordinate defining signal due to capacitance variations of liquid crystal, an output of a driver for a scan or signal line is subjected to a high impedance in the non-writing period to isolate scan lines or signal lines. A light weight compact device is implemented.
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NEC Corporation
Powell Mark R.
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