Array substrate for liquid crystal display device and method of manufacturing the same

A method of manufacturing a liquid crystal display device, comprising:

• forming first, second and third active patterns, an extension portion and a metal pattern on a substrate using a first mask, the substrate having a driving region and a pixel region, the first and second active patterns in first and second driving regions of the driving region, the third active pattern in a switching region of the pixel region, and the extension portion and the metal pattern in a storage region of the pixel region;
• forming a gate insulating layer on the substrate including the first, second and third active patterns, the extension portion and the metal pattern;
• forming first, second and third gate electrodes and a storage line on the gate insulating layer using a second mask, the first, second and third gate electrodes corresponding to center portions of the first, second and third active patterns, and the storage line disposed over the metal pattern;
• substantially sequentially doping n+ ions and n− ions in the first and third active patterns using a third mask;
• doping p+ ions into the second active pattern using a fourth mask;
• forming an inter insulating layer and a transparent conductive layer on the substrate including the p+ ion doped second active pattern;
• patterning the inter insulating layer and the transparent conductive layer using a fifth mask to thereby expose portions of the first, second and third active patterns and to form a pixel electrode in the pixel region;
• and
• forming first source and drain electrodes, second source and drain electrodes and third source and drain electrodes using a sixth mask, the first source and drain electrodes contacting the exposed portions of the first active pattern, the second source and drain electrodes contacting the exposed portions of the second active pattern, and the third source and drain electrodes contacting the exposed portions of the third active pattern.