Patent ID: 8097115

Claim:
A manufacturing method of an electro optical device, comprising: drawing a seal material in adjacent substrate forming areas on a first large size substrate, each of the substrate forming areas having a rectangular boundary; and bonding a second large size substrate to the first large size substrate via the seal material, wherein during drawing of the seal material, the seal material is continuously drawn in the substrate forming areas by: a going stroke by which the seal material is continuously drawn through a portion of each of the substrate forming areas from a leftmost substrate forming area to a rightmost substrate forming area, the going stroke including a plurality of chamfered portions disposed near corners of the substrate forming areas, the going stroke including a right side portion disposed inside the rectangular boundary of the rightmost substrate forming area adjacent to a right side of the rectangular boundary of the rightmost substrate forming area; a return point at the end of the going stroke, the return point including: a first return point portion extending in a rightward direction across the right side of the rectangular boundary of the rightmost substrate forming area to a region outside of the rectangular boundary of the rightmost substrate forming area, a second return point portion extending from the first return point portion in a direction substantially perpendicular to the first return point portion, a third return point portion extending in a leftward direction from the second return point portion, a fourth return point portion extending obliquely from the third return point portion toward the first return point portion; and a returning stroke by which the seal material is continuously drawn from the return point and through a different portion of each of the substrate forming areas, the returning stroke including a lower coupling portion extending from the fourth return point portion in a leftward direction across the right side of the rectangular boundary of the rightmost substrate forming area.