Patent ID: 7521797

Claim:
An electrooptical device having a switching element that drives a light emitting element and is mounted on a wiring substrate, comprising: an electrode pad of the wiring substrate and an electrode pad of the switching element arranged at a predetermined interval and mechanically coupled with an adhesive containing a spacer having a filler and a particle with a predetermined size; and a bump grown from at least one of the electrode pad of the wiring substrate and the electrode pad of the switching element, wherein the wiring substrate and the switching element are mechanically coupled and the wiring substrate and the switching element are electrically coupled through the bump and wherein the electrode pads are annularly arranged so as to surround the mechanical coupling part of the wiring substrate and the switching element; wherein the bump is grown by soaking the electrode pad of the wiring substrate and the electrode pad of the switching element in a solution to remove residue on the electrode pad of the wiring substrate and the electrode pad of the switching element, by activating the electrode pad of the wiring substrate and the electrode pad of the switching element by applying a catalyst to the electrode pad of the wiring substrate and the electrode pad of the switching element, and by soaking the electrode pad of the wiring substrate and the electrode pad of the switching element in an electroless nickel plating bath.