Patent ID: 7344227

Claim:
A method for reducing a width of a substrate for a micro-fluid ejection device, the method comprising the steps of: providing at least one fluid supply slot in a substrate; forming a plurality of micro-fluid ejection actuators in a columnar array on a device surface of the substrate adjacent the fluid supply slot; forming a plurality of power transistors in a columnar array adjacent the ejection actuators, the power transistors occupying a power transistor area of the substrate and being interconnected to the ejection actuators in a first metal conductor layer; forming a columnar array of logic circuits adjacent the power transistors, the logic circuits occupying a logic circuit area of the substrate and being interconnected to the power transistors in a polysilicon conductor layer; and depositing a second metal layer on the substrate to provide a power buss and a ground buss to the ejection actuators, wherein the power buss overlaps at least a portion of the power transistor active area and the ground buss overlaps at least a portion of the logic circuit area.