Patent ID: 8673520
Filing Date: 2014-03-18
Classification: G03F,G06F

Abstract:
1. A device, comprising: a gradated photomask including: a transparent substrate; a first region of the transparent substrate including a first array of a first plurality of sub-resolution features, wherein the first region blocks a first percentage of an incident radiation and wherein each of the sub-resolution features of the first plurality of sub-resolution features is an area of attenuating material surrounded by the transparent substrate, wherein each area of attenuating material includes a single opening in the attenuating material; and a second region of the transparent substrate including a second array of a second plurality of sub-resolution features, wherein the second region blocks a second percentage of the incident radiation different than the first percentage, and wherein each of the each of the sub-resolution features of the second plurality of sub-resolution features of the second array is an area of attenuating material surrounded by the transparent substrate, wherein each area has a single opening in the attenuating material.