| 摘要 |
<p>A liquid crystal device is provided, for example in the form of a combined display and sensor forming a touch screen. The device comprises an array, for example of active matrix type, of sensor circuits. Each sensor circuit comprises a liquid crystal sensing capacitor (CV) connected to a transistor M1 arranged as a source-follower. A sensor selecting capacitor (C1) in the form of a voltage dependent capacitor is connected between the transistor (M1) and a row select line (RWS). The capacitance of the voltage dependent capacitor (C1) is dependent on the voltage across it and has a larger value for a small voltage and a smaller value for a large voltage.</p> |
