Patent ID: 8261660

Claim:
A tool apparatus for dry transfer printing of semiconductor elements, said apparatus comprising: a base plate having a center opening; a top plate operationally connected to said base plate, wherein said top plate comprises an optically transparent window; a transfer stamp for transfer printing, wherein said stamp has a top surface and a transfer surface positioned on an external surface of said stamp and oriented in a direction opposite to the direction of said top surface for transferring said semiconductor elements from a donor substrate; a mount for operationally connecting said transfer stamp to said base plate; an actuator operationally connected to said top plate for controllably moving said top plate; and a micro-chamber having an internal cavity volume that separates said transfer stamp from said top plate, wherein said micro-chamber is capable of controllable pressurization and rapid depressurization by an increase in said internal cavity volume, wherein upon pressurization said internal cavity exerts a controllable pressure against said transfer stamp top surface, wherein said internal cavity has a volume that is variably controlled by said actuator moving said top plate, said internal cavity formed by said top plate and said transfer stamp top surface; wherein: an increase in said internal cavity volume by said top plate movement away from said stamp top surface decreases pressure in said internal cavity volume thereby moving said transfer surface in a direction away from said donor substrate.