Array substrate for LCD device having double-layered metal...

Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal

Reexamination Certificate

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Details

C349S152000

Reexamination Certificate

active

07605877

ABSTRACT:
The present invention is an array substrate for use in a liquid crystal display device, which includes a gate electrode, a gate line and a gate pad on a substrate, wherein the gate electrode, the gate line and the gate pad have a double-layered structure consisting of a first metal layer and a first barrier metal layer in series from the substrate, and wherein the first metal is one of aluminum and aluminum alloy; a gate insulation layer on the substrate covering the gate electrode, gate line and gate pad; an active layer and an ohmic contact layer sequentially formed on the gate insulation layer and over the gate electrode; a data line on the gate insulation layer perpendicularly crossing the gate line, source and drain electrodes contacting the ohmic contact layer, and a data pad on the gate insulation layer, wherein the data line, the source and drain electrode and the data pad have a double-layered structure consisting of a second barrier metal layer and a second metal layer of copper; a passivation layer formed on the gate insulation layer to cover the data line, source and drain electrodes, and data pad, wherein the passivation layer has a drain contact hole exposing a portion of the drain electrode, a gate pad contact hole exposing a portion of the gate pad, and a data pad contact hole exposing a portion of the data pad; and a pixel electrode, a gate pad terminal and a data pad terminal on the passivation layer, all of which are formed of a transparent conductive material on the passivation layer.

REFERENCES:
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patent: 6043511 (2000-03-01), Kim
patent: 6091464 (2000-07-01), Song
patent: 6380559 (2002-04-01), Park et al.
patent: 2002/0051110 (2002-05-01), Kim
patent: 2002/0081847 (2002-06-01), Jo et al.
patent: 2002/0117691 (2002-08-01), Choi et al.

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