Patent ID: 9632438
Date: 2017-04-25
CPC Classifications: G03F

Claim:
1. A method of forming a pattern, the method comprising: preparing a target substrate comprising a base substrate and a photoresist layer on the base substrate; aligning a phase shift mask to the target substrate, the phase shift mask comprising a mask substrate comparted into a first region including a first sub region and second sub regions at sides of the first sub region, and second regions at sides of the first region, the phase shift mask comprising a phase shift layer on the mask substrate corresponding to the first region, and a plurality of openings respectively corresponding to the second regions on the mask substrate; fully exposing the photoresist layer at the first sub region and the second regions by utilizing the phase shift mask; and removing the photoresist layer at the first sub region and the second regions to form first and second photoresist patterns corresponding to the second sub regions, wherein transmittance of the phase shift layer is selected to fully expose the photoresist layer in the first sub region.