Thin film transistor array substrate, method of manufacturing the same, and display device having the same

A method of manufacturing a thin film transistor array substrate, the method comprising:

• disposing a polarizing plate comprising a first metal pattern, a second metal pattern, and a third metal pattern on a base substrate;
• disposing, on the polarizing plate, a first protective layer comprising a first opening through which a portion of any one of the first to third metal patterns is exposed;
• disposing, on the first protective layer, a gate line and a gate electrode extending from the gate line;
• disposing, over the gate line and the gate electrode, a gate insulating layer comprising a second opening formed to correspond to a position of the first opening;
• disposing, on the gate insulating layer, a semiconductor layer, a data line, a source electrode extending from the data line, and a drain electrode spaced apart from the source electrode;
• disposing, over the data line, the source electrode, and the drain electrode, a second protective layer comprising a third opening formed to correspond to a position of the second opening, a fourth opening through which the data line is exposed, and a contact hole through which a portion of the drain electrode is exposed;
• and
• disposing a pixel electrode connected to the drain electrode through the contact hole, and disposing a contact line in contact with the data line through the fourth opening and connected to the metal pattern exposed through the first to third openings.

A display device comprising:

• a first protective layer disposed on a base substrate;
• a gate line disposed on the base substrate in a first direction;
• a data line disposed in a second direction perpendicular to the first direction;
• a thin film transistor connected to the gate line and the data line and disposed on the first protective layer;
• a display element connected to the thin film transistor and comprising a pixel electrode;
• a polarizing plate disposed between the base substrate and the first protective layer, the polarizing plate comprising a first metal pattern overlapping the thin film transistor on a plane, a second metal pattern overlapping the pixel electrode on a plane, and a third metal pattern overlapping the data line on a plane;
• and
• a contact line disposed over the data line along the second direction, the contact line electrically connecting the data line and the third metal pattern, a part of the contact line being directly disposed on the data line,
• wherein the first metal pattern, the second metal pattern, and the third metal pattern are disposed on the same layer under the first protective layer, and
• wherein the data line is electrically connected to the third metal pattern through the contact line and comprises a line of a double structure.