Patent ID: 7563656
Filing Date: 2009-07-21
Classification: G02F,H01L

Abstract:
1. A method of manufacturing a display substrate, comprising: forming a semiconductor pattern, a signal electrode on the semiconductor pattern, and a contact electrode on the semiconductor pattern, the contact electrode comprising a contact portion electrically connected to the signal electrode and an undercut portion electrically connected to the contact portion, the contact portion exposing a portion of the semiconductor pattern; and forming a passivation layer on a gate insulating layer, the gate insulating layer being arranged on an insulating substrate, and the semiconductor pattern, the signal electrode, and the contact electrode are arranged on the gate insulating layer; first etching the gate insulating layer, the passivation layer, and the semiconductor pattern adjacent to the undercut portion to form an undercut under the undercut portion; second etching the first etched passivation layer to expose the portion of the semiconductor pattern that protrudes from under the contact portion; and forming a pixel electrode, the pixel electrode being electrically connected to the contact portion along the exposed portion of the semiconductor pattern, wherein the method further comprises: forming a photoresist film on the passivation layer; and patterning the photoresist film using a mask, and wherein the mask comprises: an opaque portion covering the signal electrode; a transparent portion corresponding to a portion of the gate insulating layer exposed by the semiconductor pattern: a first translucent portion covering a portion of the gate insulating layer adjacent to the contact portion; and a second translucent portion interposed between the first translucent portion and the transparent portion.