Patent ID: 8529777

Claim:
A method of making a mask for patterning a thin film, comprising: a step of forming an inorganic material, which is resolvable into alkali solution, on a substrate; a step of forming the inorganic material in a predetermined pattern; and a step of narrowing the inorganic material with the alkali solution to form the mask, wherein the step of forming the inorganic material in the predetermined pattern includes: forming an etching stopper layer having a tolerance to etching on the inorganic material; forming a photoresist in a predetermined pattern on the etching stopper layer by a photolithography method; removing a portion of the etching stopper layer that is not covered by the photoresist to form the etching stopper layer in a predetermined pattern; and removing a portion of the inorganic material by etching, the portion not being covered by the etching stopper layer in the predetermined pattern.