Patent ID: 7583329

Claim:
An electro-optical device substrate comprising: a substrate; a plurality of data lines; a plurality of scanning lines intersecting the plurality of data lines in a display area formed on the substrate; pixel electrodes that are provided at positions corresponding to intersections of the plurality of data lines and the plurality of scanning lines; and transistors, each including; a semiconductor layer including: a channel region with a channel length along a first direction in the display area; a data line side source/drain region electrically connected to a corresponding one of the data lines; a pixel electrode side source/drain region electrically connected to a corresponding one of the pixel electrodes, a first junction region located between the channel region and the data line side source/drain region; and a second junction region formed between the channel region and the pixel electrode side source/drain region; and a gate electrode including; a body portion that is arranged in layer above the semiconductor layer through a first insulating film and that overlaps the channel region as viewed in plan; a first elongated portion extending from the body portion by a side of the semiconductor layer along the first direction to a side of the second junction region so as to adjoin at least the second junction region; a second elongated portion extending from at least a portion of the first elongated portion along a second direction that intersects with the first direction, and electrically connected to a corresponding one of the scanning lines; and a longitudinal groove formed in the first insulating film at a portion that overlaps the first elongated portion on the substrate as viewed in plan so as to extend along the second junction region, the first elongated portion having an inner groove portion that is at least partly formed inside the groove.