Patent ID: 7939223
Filing Date: 2011-05-10
Classification: G03F

Abstract:
1. A method of fabricating a photomask, comprising: preparing a light-shielding layer and a first resist film on a substrate; forming a first resist pattern by exposing first exposed regions of the first resist film adjacent to patterns in a first pattern region to a first exposure source having a first energy, so as to selectively expose the light-shielding layer; forming a first light shielding pattern by etching the selectively exposed light-shielding layer by utilizing the first resist pattern as an etching mask; removing the first resist pattern; forming a second resist film on the first light-shielding layer; forming a second resist pattern by exposing second exposed regions of the second resist film, except for the first exposed regions of the first pattern region, and a second pattern region overlapping the first pattern region to a second exposure source having a second energy, the overlapping first and second pattern regions having different pattern densities; forming a second light shielding pattern by etching the selectively exposed first light shielding pattern by utilizing the second resist pattern as a mask for etching; and removing the second resist pattern.