A patterned thin-film layer (100) includes a substrate (102), a plurality of banks (104) formed on the substrate and a plurality of thin-film layers (106). The plurality of banks define a plurality of spaces therein, and the spaces are arranged in rows and columns. The plurality of patterned thin-film layers formed in the plurality of spaces in a manner such that the patterned thin-film layers made of a same material in each row have an irregular thickness distribution. A method for manufacturing a patterned thin-film layer is also provided.