Patent ID: 8110478

Claim:
A manufacturing method of a display device comprising the steps of: cutting each of a plurality of substantially circular single crystal semiconductor wafers of 300 to 450 mm in diameter into a substantially quadrangular single crystal semiconductor substrate; forming a damaged layer by implantation of hydrogen ions in each of the plurality of substantially quadrangular single crystal semiconductor substrates; forming a bonding layer on each of the plurality of substantially quadrangular single crystal semiconductor substrates after the step of forming the damaged layer; bonding the plurality of substantially quadrangular single crystal semiconductor substrates to a supporting substrate having an insulating surface with the bonding layer interposed therebetween; wherein the bonding the plurality of substantially quadrangular single crystal semiconductor substrates comprises exposing at least a portion of the supporting substrate between at least two of the substantially quadrangular single crystal semiconductor substrates; separating each of the plurality of substantially quadrangular single crystal semiconductor substrates at the damaged layer so that a plurality of single crystal semiconductor layers are left over the supporting substrate; and forming one or a plurality of display panels from each of the plurality of single crystal semiconductor layers, and wherein each vertex of the plurality of substantially quadrangular single crystal semiconductor substrates is provided on each circumference of the plurality of substantially circular single crystal semiconductor wafers.