Patent ID: 7274420

Claim:
A method of manufacturing a liquid crystal display device, the method comprising: forming a gate electrode on display region of a substrate, and a gate pad on a pad region of the substrate located in a periphery of the display region; forming a gate insulation layer to cover the gate electrode and the gate pad; forming an active pattern and a ohmic contact pattern on the gate insulation layer; forming a first electrode and a second electrode on the ohmic contact pattern, and simultaneously forming a data pad on the gate insulation layer in the pad region; forming a passivation layer on the first and second electrodes, the data pad, and the gate insulation layer; etching the passivation layer and gate insulation layer to form first, second, and third contact holes for exposing the second electrode, the gate pad, and the data pad, respectively; forming a transparent electrode on the display region and simultaneously, forming a gate pad electrode and a data pad electrode connected to the gate pad and the data pad through the second and third contact holes, respectively; successively forming a barrier metal layer and a reflective layer on the transparent electrode and the pad electrodes; annealing the reflective layer for preventing lifting of the reflective layer; and patterning the reflective layer and the barrier metal layer to form a reflective electrode and a barrier metal layer pattern on the transparent electrode, wherein the barrier metal layer pattern and the reflective electrode are formed only on the transparent electrode excluding the first contact hole.