Patent ID: 7550770

Claim:
A structure of multi-gate thin film transistor (TFT) for LCD, comprising: a polycrystalline silicon layer formed on a substrate, said polycrystalline silicon layer formed with a source region, a first doped region, a first gate channel, a second doped region, a second gate channel, a third doped region, and a drain region, further, said polycrystalline silicon layer comprising a vertical portion and a first horizontal portion having one end connected with one end of said vertical portion; a multi-gate including a scanning line and only one I-shaped extension portion, formed on said substrate and said scanning line and said only one I-shaped extension portion intersected, respectively, with said vertical portion and said first horizontal portion of said polycrystalline silicon layer so that said first gate channel and said second gate channel are formed at two intersected positions; and a gate oxide layer formed in between said multi-gate and said polycrystalline silicon layer.