Driving circuit for driving liquid crystal display device

摘要

In a driving circuit for driving an active matrix type liquid crystal display device, the analog buffer includes a differential circuit constructed by P-channel thin film transistors (TFTs) and a current mirror circuit constructed by N-channel TFTs. When a voltage on a first input terminal of the differential circuit which is connected with a storage capacitor increases, an input current in the current mirror circuit connected with a reverse phase output terminal to the first input terminal decreases and an output current of the current mirror circuit decreases in response to decrease of the input current of the current mirror circuit. On the other hand, since a current through a common phase output terminal to the first input terminal increases, a voltage on the signal line increases and reaches a voltage on the first input terminal of the differential circuit.