Patent ID: 6638786
Filing Date: 2003-10-28
Classification: H01L

Abstract:
A method for forming an image sensor comprising:forming a plurality of pixels in a semiconductor substrate, each pixel including a light sensitive element, said pixels grouped as a center portion of pixels and an outer portion of pixels; forming a micro-lens material over said plurality of pixels, wherein said micro-lens material is a photoresist; exposing said micro-lens material with a first reticle mask to generate gap sections in said micro-lens material; exposing said micro-lens material with a second reticle mask to generate top portions in said micro-lens material located in said center portion of pixels; developing said micro-lens material to remove said top portions and said gap sections; reflowing said micro-lens material to form a first set of micro-lenses over each of said pixels in said center portion of pixels and a second set of micro-lenses over each of said pixels in said outer portion of said pixels, wherein said second set of micro-lenses differ from said first set of micro-lenses.