Array substrate for display device
First Claim
Patent Images
1. An array substrate comprising:
- a substrate having a display area and a peripheral area surrounding the display area; and
a switching device formed on the display area and having a gate electrode, a source electrode and a drain electrode, wherein the gate electrode includes a first metal layer, a second metal layer stacked on the first metal layer, and a third metal layer stacked on the second metal layer, and wherein the third metal layer is formed by nitrating the second metal layer.
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Abstract
A substrate for an LCD display device exhibiting improved display quality through lower contact resistance and elimination of undercutting. The display switches have three electrodes, at least one of which has three metal layers, the third of which is formed by nitrating the second metal layer. The pixel electrode is electrically connected to the second metal layer through a contact hole formed through an insulation layer and the second metal layer of the switching device.
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Citations
44 Claims
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1. An array substrate comprising:
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a substrate having a display area and a peripheral area surrounding the display area; and
a switching device formed on the display area and having a gate electrode, a source electrode and a drain electrode, wherein the gate electrode includes a first metal layer, a second metal layer stacked on the first metal layer, and a third metal layer stacked on the second metal layer, and wherein the third metal layer is formed by nitrating the second metal layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An array substrate comprising:
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a substrate having a display area and a peripheral area surrounding the display area;
a switching device formed on the display area and having a first electrode, a second electrode and a third electrode;
an electrode pad extended from one of the first, the second and the third electrodes and formed on the peripheral area, the electrode pad including a first metal layer, a second metal layer stacked on the first metal layer, and a third metal layer stacked on the second metal layer, wherein the third metal layer is formed by nitrating the second metal layer;
an insulation layer formed on the electrode pad; and
a transparent electrode formed on the insulation layer, the transparent electrode electrically connected to the second metal layer through a via hole, wherein the via hole is formed through the insulation layer and the third metal layer. - View Dependent Claims (13, 14, 15)
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16. An array substrate comprising:
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a substrate having a display area and a peripheral area surrounding the display area;
a switching device formed on the display area and having a first electrode, a second electrode and a third electrode, wherein at least one of the first, the second and the third electrodes includes a first metal layer, a second metal layer stacked on the first metal layer, and a third metal layer stacked on the second metal layer, and wherein the third metal layer is formed by nitrating the second metal layer;
an electrode pad extended from one of the first, the second and the third electrodes and formed on the peripheral area, the electrode pad including the first metal layer, the second metal layer stacked on the first metal layer, and the third metal layer stacked on the second metal layer;
an insulation layer formed on the substrate where the switching device and the electrode pad are formed;
a first transparent electrode formed on the insulation layer, the first transparent electrode electrically connected to the second metal layer through a contact hole, wherein the contact hole is formed through the insulation layer and the third metal layer of the one of the first, the second and the third electrodes; and
a second transparent electrode formed on the insulation layer, the second transparent electrode electrically connected to the second metal layer through a via hole, wherein the via hole is formed through the insulation layer and the third metal layer of the electrode pad. - View Dependent Claims (17)
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18. An array substrate comprising:
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a substrate;
a first signal line formed on the substrate and including a first metal layer, a second metal layer stacked on the first metal layer, and a third metal layer stacked on the second metal layer, wherein the third metal layer is formed by nitrating the second metal layer;
an insulation layer formed on the first line signal; and
a second signal line formed on the insulation layer to cross the first signal line. - View Dependent Claims (19, 20, 21, 22)
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23. An array substrate comprising:
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a substrate having a display area and a peripheral area surrounding the display area;
a switching device formed on the display area and having a first electrode, a second electrode and a third electrode, wherein at least one of the first, the second and the third electrodes includes a first metal layer and a second metal layer stacked on the first metal layer, and wherein the second metal layer is nitrated to have nitrogen ions in an upper portion; and
a pixel electrode electrically connected to one of the first, the second and the third electrodes of the switching device. - View Dependent Claims (24, 25)
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26. A method of forming an array substrate comprising:
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forming a switching device on a display area of a substrate, wherein the switching device has a first electrode, a second electrode and a third electrode, wherein at least one of the first, the second and the third electrodes has a first metal layer, a second metal layer stacked on the first metal layer, and a third metal layer stacked on the second metal layer, and wherein the third metal layer is formed by nitrating the second metal layer;
forming an insulation layer on the substrate where the switching device is formed; and
forming a pixel electrode on the insulation layer to be electrically connected to the second metal layer of the switching device through a contact hole, the contact hole is formed through the insulation layer and a portion of the third electrode. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34)
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35. A method of forming an array substrate comprising:
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forming a first metal layer on a substrate using aluminum alloy;
forming a second metal layer on the first metal layer using chrome;
etching the first and the second metal layers using a mixed etching solution, wherein the mixed etching solution includes a first etching solution for etching the first metal layer and a second etching solution for etching the second metal layer; and
etching the second metal layer using a third etching solution, the second metal layer remaining after being etched using the mixed etching solution. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42)
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43. A display device comprising:
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a first substrate having a transparent electrode;
a second substrate facing the first substrate, the array substrate comprising;
a switching device having a first electrode, a second electrode and a third electrode, wherein at least one of the first, the second and the third electrodes having a first metal layer, a second metal layer, and a third metal layer, and wherein the third metal layer is formed by nitrating the second metal layer;
an insulation layer formed on the switching device;
a second transparent electrode facing the first transparent electrode, the second transparent electrode electrically connected to the second metal layer of the switching device through a contact hole, wherein the contact hole is formed through the insulation layer and the third metal layer of the switching device;
an electrode pad extended from one of the first, the second and the third electrodes and having the first, the second and the third metal layers; and
a third transparent electrode electrically connected to the second metal layer of the electrode pad through a via hole, wherein the via hole is formed through the insulation layer and the third metal layer of the electrode; and
a liquid crystal layer interposed between the first and the second substrate. - View Dependent Claims (44)
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Specification