Patent ID: 7528819

Claim:
A data switching circuit, comprising: a control unit for providing a switching signal, wherein the switching signal comprises a first state and a second state, and the state of the switching signal is changed every time when each of the frames and each of the scan lines of a TFT LCD is started; and a switching unit comprising: 4N switching modules, wherein an operating terminal of the (4i−3) th switching module electrically is coupled to the switching signal, when the switching signal is in the first state, the (2i−1) th input terminal is connected to the (2i−1) th output terminal, and when the switching signal is in the second state, the (2i−1) th input terminal is disconnected from the (2i−1) th output terminal; an operating terminal of the (4i−2) th switching module is electrically coupled to a first inverse switching signal, when the inverse switching signal is in the first state, the 2i th input terminal is connected to the (2i−1) th output terminal, and when the first inverse switching signal is in the second state, the 2i th input terminal is disconnected from the (2i−1) th output terminal; an operating terminal of the (4i−1) th switching module is electrically coupled to a second inverse switching signal, when the second inverse switching signal is in the first state, the (2i−1) th input terminal is connected to the 2i th output terminal, and when the second inverse switching signal is in the second state, the (2i−1) th input terminal is disconnected from the 2i th output terminal; and an operating terminal of the 4i th switching module is electrically coupled to the switching signal, when the switching signal is in the first state, the 2i th input terminal is connected to the 2i th output terminal, and when the switching signal is in the second state, the 2i th input terminal is disconnected from the 2i th output terminal, wherein N and i are positive integers, and 1≦i≦N.