Patent ID: RE41363

Claim:
A TFT substrate, comprising: a gate electrode, a gate pad and a gate line formed on a transparent substrate and comprising a first wire pattern containing Al formed over the transparent substrate, and a second wire pattern containing a refractory metal formed over the first wire pattern ; an insulating layer pattern formed over the gate electrode and exposing a portion of the second wire pattern of the gate pad containing the refractory metal ; a semiconductor film pattern formed over the insulating layer pattern and over the gate electrode; an impurity doped semiconductor film pattern formed on the semiconductor film pattern, wherein entire bottom surfaces of the impurity doped semiconductor film pattern contacts contact a top surface of the semiconductor film pattern formed over the gate electrode; a source electrode , connected to a data line, and a drain electrode , and a data line formed over a portion portions of the impurity doped semiconductor film pattern; a protection film pattern formed over the source electrode and the drain electrode and over the insulating layer pattern in an area of the gate pad, the protection film pattern having a contact hole over the drain electrode and exposing a top surface of the gate pad; a first pixel electrode pattern electrically connected to the drain electrode on the protection film pattern; and a second pixel electrode pattern directly connected to the exposed top surface of the second wire pattern of the gate pad containing the refractory metal, wherein the semiconductor film pattern includes a portion disposed between the source electrode and the drain electrode, and wherein a portion of the protection film pattern directly contacts a top surface of the portion of the semiconductor film pattern disposed between the source electrode and the drain electrode, and wherein an interior angle formed between a lateral surface of the first wire pattern containing Al and the transparent substrate is smaller than an interior angle formed between a lateral surface of the second wire pattern containing the refractory metal and the transparent substrate .