In this paper, we present an advanced in‐cell active touch circuit using a‐Si thin film transistors (TFTs) for large size panel. The circuit design is different from traditional mutual‐capacitance and self‐capacitance in‐cell touch panel which are so‐called passive touch circuit. The touch capacitance formed between the touching finger and the common electrode of IPS LC is used to share the charge with the couple capacitance on common electrode. The sensing line is used to sense the current of the active device for different charging status to determine whether an external object are touched or approached.