Transfer printing method and transfer printing apparatus

A transfer printing method, comprising:

• transferring a plurality of devices formed on an original substrate to a transfer substrate;
• obtaining first position information of positions of the plurality of devices on the transfer substrate;
• obtaining second position information of corresponding positions, on a target substrate, of devices to be transferred;
• comparing the first position information with the second position information to obtain first target position information recording a first transfer position;
• and
• aligning the transfer substrate with the target substrate, and performing a site-designated laser irradiation on at least part of devices on the transfer substrate corresponding to the first transfer position, simultaneously, according to the first target position information, so as to transfer the at least part of devices from the transfer substrate to the target substrate;
• wherein before forming the plurality of devices, the transfer printing method comprises:
• forming a sacrificial layer on the original substrate and patterning the sacrificial layer to form a plurality of sacrificial layer blocks spaced apart from each other;
• and
• the forming the plurality of devices comprises:
• forming a material layer for forming the plurality of devices on a side of the plurality of sacrificial layer blocks away from the original substrate, the material layer comprising portions located on the plurality of sacrificial layer blocks and portions located at gaps between adjacent sacrificial layer blocks;
• patterning the material layer to form the plurality of devices on the plurality of sacrificial layer blocks and to form connecting sections connecting every adjacent two devices, the connecting sections comprising portions on the plurality of sacrificial layer blocks and portions at the gaps between adjacent sacrificial layer blocks;
• and
• removing the sacrificial layer.