Jul 01 2009

What is Thin-film transistor(TFT)

Published by admin at 2:46 am under Technique Terms

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.

The best known application of thin-film transistors is in TFT LCDs, an implementation of LCD technology. (LCD is short for Liquid Crystal Display)Transistors are embedded within the panel itself, reducing crosstalk between pixels and improving image stability.

7" TFT LCD Display DVD GPS

7" TFT LCD Display DVD GPS

As of 2008, many color LCD TVs and monitors 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 medical radiography.

The new AMOLED (Active Matrix OLED) screens also contain a TFT layer.

The most beneficial aspect of TFT technology is a separate transistor for each pixel on the display. As each transistor is small, the amount of charges essential for controlling it also small. This allows for very fast re-drawing of the display.

Prior to TFT, passive matrix LCD displays could not keep up with fast moving images. A mouse dragged across the screen, for example, from point A to point B, would disappear between the two points. A TFT monitor can track the mouse, resulting in a display that can be used for video, gaming and all forms of multimedia.

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9 Responses to “What is Thin-film transistor(TFT)”

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