Everything about Thin Film Transistor totally explained
A
thin film transistor (
TFT) is a special kind of
field effect transistor made by depositing
thin films of a
semiconductor active layer as well as the
dielectric layer and metallic contacts over a supporting substrate. A common substrate is
glass, since the primary application of TFTs is in
liquid crystal displays. This differs from the conventional
transistor where the semiconductor material typically is the substrate, such as a
silicon wafer.
TFTs can be made using a wide variety of semiconductor materials. A common material is
silicon. The characteristics of a silicon based TFT depend on the crystalline state. That is, the semiconductor layer can be either
amorphous silicon,
microcrystalline silicon, and metal oxides such as Zinc Oxide.
Applications
The best known application of thin-film transistors is in
TFT LCDs, a variant of
LCD technology. Transistors are embedded within the panel itself, reducing crosstalk between
pixels and improving image stability. As of
2004, all but the cheapest color LCD screens use this technology. TFT panels are heavily used in digital radiography applications in General Radiography. It is used in both Direct and Indirect capture as a base for the Image Receptor in Radiography.
The new AMOLED (
Active Matrix OLED) screens also contain a TFT layer.
Further Information
Get more info on 'Thin Film Transistor'.
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