Circuit film with bump, film package using the same, and related fabrication methods

摘要

A circuit film having film bumps is provided for a film package. An IC chip is mechanically joined and electrically coupled to the circuit film through the film bumps instead of conventional chip bumps. In a fabrication method, a base film is partially etched by a laser to create an etched area that defines raised portion relatively raised from the etched area. Then a circuit pattern is selectively formed on the base film, partly running over the raised portions. The raised portion and the overlying circuit pattern constitute the film bumps having a height not greater than the height of the circuit film.