Thin Film Transistor and Its Application in Active Matrix Liquid Crystal Displays

Thin film transistor(TFT)is one type of field effect transistors(FET). TFT's in high definition displays, such as personal computers and LCD monitors,are used in the dot-matrix driven active matrix liquid crystal display(AMLCD). As a switching device, TFT in AMLCD operates in saturation mode. Its source contact is always connected to the data bus(video), and the drain to the pixel electrode. There are two basic structures of TFT: staggered/inverted-staggered and coplanar/inverted-coplanar.The main process for TFT′s is compatible with IC processing technology.And its semiconductor layer is amorphous silicon.