Patent ID: 6747727
Filing Date: 2004-06-08
Classification: G02F

Abstract:
A method of forming a bump structure, said method comprising:(a) using a light to pass through a photomask to expose a photosensitive material layer deposited on the surface of a substrate, wherein said photomask comprising two major portions that are formed by mirror image with each other, the wides of openings formed in said photomask being increased from a central portion to an edge portion, the spaces between two adjacent said openings being decreased from said central portion to said edge, and a diffraction situation being generated when said light passing through said photomask; (b) shifting said substrate with a distance to a direction perpendicular to a surface of said photomask; (c) exposing said photosensitive material layer by using said photomask; and (d) developing the photosensitive material to form said bump structure.