Patent ID: 7943052
Filing Date: 2011-05-17
Classification: B23K,B81C,H01L

Abstract:
1. A method for self-assembling microstructure onto a substrate comprising the steps of: (a) providing a plurality of microstructures, each of which comprises a contact region on which a first solder pad is formed and a first bonding material supported on a solder bump formed on each of the first solder pads; (b) attaching the microstructures to a release device with stickiness; (c) providing a substrate, which comprises a plurality of second solder pads corresponding to the first solder pads on the microstructures, and a liquid second bonding material supported on each of the second solder pads; (d) placing a plate between the release device and the substrate, the plate having a plurality of throughholes corresponding to the second solder pads on the substrate, sizes of the throughholes being larger than those of the microstructures; (e) removing the stickiness of the release device to allow the microstructures to fall through the throughholes of the plate and onto the substrate, and assembling the microstructures to the solder pads on the substrate by a physical attraction force induced between the first bonding material and the liquid second bonding material in liquid; and (f) reflowing the solder bumps in order to permanently fix the microstructures on the substrate.