TFT Substrates
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The Definition of TFT
TFT (Thin Film Transistor)
A thin-film transistor (TFT) is a special kind of field-effect transistor made by depositing thin films of an active semiconductor layer as well as the dielectric layer and metallic contacts over a supporting (but non-conducting) substrate.
a-si TFT : low mobility
Oxide TFT : High mobility
poly-Si TFT : Highest mobility
Features
· a-Si TFT
An a-Si TFT is that the material of the electron channel
is amorphous silicon. Since this has low electron
mobility, it is used for a small type of LCD or a
low-definition display.
· Oxide TFT
A LTPS (Low-Temperature Poly Silicon) TFT made of
Polycrystalline Silicons, has one-hundred times faster
electron mobility than that of an a-Si TFT. A LTPS TFT
is generally used for a high-definition display or an
OLED display.
· LTPS TFT
An Oxide TFT made of Indium, Gallium, Zinc, and O²,
has ten-times faster electron mobility than that of
an a-Si TFT. An Oxide TFT’s process is so similar to
that of an a-Si TFT that it is used for a large OLED TV.