The present invention provides a liquid crystal device. An electrode for detecting is formed on a first substrate. The liquid crystal capacitor of the pixel electrode comprises a pixel electrode, the opposite electrodes connected with the control wire and the liquid crystal exerted to the fringe field between the two electrodes. A selection circuit is connected with the pixel electrode corresponding with the scanning line of the selection line and the signal wire in the selection period, and is insulated with the signal wire after the selection period. A signal supplying circuit supplies the electric potential corresponding with the positive polarity writing or negative polarity writing. A potential control circuit set the control wire to the potential (VL) (LCCOM) in negative polarity writing in the selection period for selecting the scanning wire corresponding with the control wire, and set the control wire to the potential (LCCOM). Therefore the effect of the noise generated by the electrode for detecting can be restrained with a simple structure.