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Difference between LCD and TFT LCD?

B

bruce02

Weaksauce
Joined
Jul 5, 2004
Messages
74
I don't know much about displays, and I've come accross TFT LCDs while looking around..Whats the difference?
 
TFT stands for 'thin film transistor', which basically denotes the screen is constructed with an overlay that allows for "active" switching to control each pixel. It is a holdover from the days when passive-matrix displays called DSTN were common. In the 90s, active matrix displays cost thousands of dollars, so passive matrix displays dominated. The main difference was that passive matrix displays had a single addressing system for referencing the pixels by row and column, rather than the active method where each pixel gets its own transistor. At this time, LCDs were not yet made for the desktop and were only found in laptops. DSTNs weren't altogether too much worse than the TFTs of the time, but they were still quite bad.

Contrast ratios were a horrible 20:1 if that, and the response time was measured in tenths of a second. That is, as long as you were looking head-on at the screen. The viewing angle felt like 30 degrees to me, or else you saw a dim mess if anything at all. While nowadays we hear about ghosting, back then the prevalent problem was a severe form of ghosting called "submarining", which was when on-screen elements in movement would actually disappear until coming to a stop. If you remember the time, countless techniques were employed to increase visibility, including custom (and garish) color schemes, large cursors and icons, and trailings.

TFT was often quoted in ads to differentiate them from the inferior DSTNs. Since just about every LCD sold today is active-matrix, TFT is pretty much a redundant term.
 
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