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Sunday, August 11, 2019

#408 Thin-Film Transistor: unsung hero of transistor technology

A Thin-Film Transistor (TFT) is a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET) fabricated using thin-film technology rather than conventional technology which forms MOSFETs on the bulk wafers. Unlike in the case of the bulk MOSFET, where channel is formed in the single crystal semiconductor, the channel in TFTs is most commonly formed using non-crystalline, amorphous semiconductor. By definition then, TFT features inferior to conventional MOSFET electronic properties because of the much higher electron mobility in the single-crystal semiconductor as compared to the amorphous semiconductor.

 

In spite of their performance limiting features, TFTs are among the most important semiconductor devices primarily because of the role they play in flat panel display technology. Whether it is a Liquid Crystal Display (LCD) or emissive display based on Light Emitting Diodes (LED) the best resolution, highest contrast, and significantly improved addressability is achieved when each pixel in individually powered up by the transistor integrated into the pixel’s structure. Displays incorporating TFTs are known as Active Matrix displays and offer the best rendering of images and colors.

Posted by Jerzy Ruzyllo at 05:34 PM | Semiconductors | Link



Semi1source.com/blog is a personal blog of Jerzy Ruzyllo. He is Distinguished Professor Emeritus in the Department of Electrical Engineering at Penn State University. With over forty years' experience in academic research and teaching in semiconductor engineering he has a unique perspective on the developments in this technical domain and enjoys blogging about it.




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