Patent ID: 7238963

Claim:
A thin film transistor having a multi-gate structure, comprising: a substrate; an active layer formed on the substrate and comprising: a first lightly doped region; a second lightly doped region and a third lightly doped region formed laterally adjacent to the first lightly doped region respectively; a first channel region and a second channel region extending laterally away from the second lightly doped region and to third lightly doped region respectively; a fourth lightly doped region and a fifth lightly doped region extending laterally away from the first channel region and the second channel region respectively; and a first heavily doped region and a second heavily doped region extending laterally away from the fourth lightly doped region and the fifth lightly doped region respectively; a first gate insulating layer formed on the active layer and comprising: a central region covering the first channel region of the active layer; a first shielding region covering the fourth lightly doped region of the active layer; and a second shielding region covering the second lightly doped region of the active layer; a second gate insulating layer formed on the active layer and comprising: a central region covering the second channel region of the active layer; a first shielding region covering the third lightly doped region of the active layer; and a second shielding region covering the fifth lightly doped region of the active layer; a first gate layer covering the central region of the first gate insulating layer; and a second gate layer covering the central region of the second gate insulating layer; wherein margin of at least one of the second lightly doped region and the third lightly doped region is substantially aligned to an edge of the second shielding region of the first gate insulating layer, and at least one of the fourth lightly doped region and the fifth lightly doped region is substantially aligned to an edge of the second shielding region of the second gate insulating layer.