In a method of manufacturing a thin film transistor substrate, a semiconductor pattern is formed on a substrate, a first etch stop layer and a second etch stop layer are sequentially formed on the semiconductor pattern, and the second etch stop layer and the first etch stop layer are sequentially patterned to form a second etch stop pattern and a first etch stop pattern. The internally generated voltage may be shared via a conductive structure that electrically couples the devices and carries the internally generated voltage. The alternate or recovery operating systems are periodically updated. The first and second protocols can be Mobile IP and PDP, respectively. In this way the viewer can always see the current video while navigating to other panels in the grid representing respective video content. The first deskew unit operates at a first clock domain and provides fine timing adjustment to a signal.