ARRAY SUBSTRATE, METHOD OF MANUFACTURING THE SAME AND DISPLAY DEVICE HAVING THE SAME

摘要

An array substrate, a method for manufacturing the same, and a display device having the same are provided to prevent inferiority of horizontal stripes by preventing local charge trapping by preventing under-cut in patterning, thereby improving display quality. A substrate has a display area(DA) and peripheral areas(PA1,PA2) formed around the display area. Switching devices(220) are formed at the display area. Each switching device has a gate electrode(221), a source electrode(225) and a drain electrode(226). The gate electrode has a first metal film, a second metal film accumulated on the first metal film, and a third metal film formed on the second metal film through nitriding of the second metal film. A pixel electrode(250) is electrically connected with the second metal film through an insulator film and contact holes(245) formed at the third metal film.