Patent ID: 7521270

Claim:
A method of forming a patterned, light-emitting device, comprising the steps of: a) providing a substrate; b) providing a first masking film and then mechanically locating the first masking film over the substrate, and then sequentially performing the following steps c-i; c) forming first openings in first locations in the masking film; d) depositing first light-emissive materials over the substrate through the first openings in the first masking film; e) mechanically removing the first masking film; f) providing a second masking film and then mechanically locating the second masking film over the substrate in a position that prevents particulate contamination in the first locations; g) forming second openings in the second masking film, wherein the second openings are in different locations over the substrate than the first openings, wherein the first locations are protected from particulate contamination resulting from the formation of the second openings; h) depositing second light-emissive materials over the substrate through the second openings in the second masking film; and i) mechanically removing the second masking film.