Patent ID: 7615336

Claim:
A method of fabricating a display device, comprising steps of: forming at least one to-be-patterned material layer on a substrate and forming a photo-resist layer on the at least one to-be-patterned material layer; providing a halftone mask including light transmission parts for transmitting light, shielding parts, in which shielding patterns for intercepting the light are formed, and a halftone transmission part, in which a first halftone transmission pattern for transmitting an amount of the light that is less than an amount of an incident light and a second halftone transmission pattern formed on the first halftone transmission pattern for transmitting an amount of the light that is less than the amount of the incident light are formed; exposing the photo-resist layer to the light through the halftone mask; developing the photo-resist layer to form a photo-resist pattern on the at least one to-be-patterned material layer on the substrate, wherein the photo-resist pattern has three different heights; and patterning the at least one to-be-patterned material layer by an etching process and an ashing process using the photo-resist pattern, and wherein a width of the second halftone transmission pattern is narrower than a width of the first halftone transmission pattern.