Patent ID: 7367657

Claim:
An inkjet printhead chip, comprising: a substrate; a plurality of transistors disposed on the substrate, wherein each of the transistors comprises: a gate, disposed on the substrate; a source and a drain, disposed in the substrate at two sides of the gate respectively; and a gate oxide layer, disposed between the gate and the substrate, wherein a thickness of the gate oxide layer is less than 800 Å; a plurality of isolation structures, disposed on the substrate and isolating each transistor; a dielectric layer, covering the transistor and the isolation structure, wherein the dielectric layer has a plurality of openings which expose the source and the drain of each transistor; a resistive layer, disposed on the dielectric layer, wherein the resistive layer has a plurality of heating areas; a first conductor section, disposed on the resistive layer and exposing the heating areas thereof to form heating devices, wherein a resistance of the heating devices is less than 95 ohm, and a power density is less than 2 GW/m 2 ; a second conductor section, disposed over the dielectric layer, electronically coupled to the drain via the opening, and the second conductor section is electronically coupled to the first conductor section; and a third conductor section, disposed over the dielectric layer, and electrically coupled to the source via the opening.