| 摘要 |
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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