Patent ID: 8228281
Filing Date: 2012-07-24
Classification: G09G

Abstract:
1. A gate drive device, comprising: first, second and third stages formed on a substrate of a liquid crystal display panel, each of which for shifting a signal from an input thereof to an output thereof; a dummy stage having a substantially similar circuit configuration as one of the first, second and third stages, the dummy stage for shifting a signal from an input thereof to an output thereof, wherein the dummy stage and the first, second and third stages are arranged along a straight line on the substrate; a first dummy line partially overlapping the respective outputs of the dummy stage and of the first, second, and third stages with a first insulation layer between the first dummy line and each of the respective overlapped outputs; a second dummy line partially overlapping the respective inputs of the dummy stage and of each of the first, second, and third stages with a second insulation layer between the second dummy line and each of the respective overlapped inputs; and a third dummy line partially overlapping the output of the dummy stage and the respective inputs of each of the first, second, and third stages with a third insulation layer between the third dummy line and the output of the dummy stage and a fourth insulation layer between the third dummy line and each of the overlapped inputs of the first, second, and third stages, wherein the output of the first stage is electrically connected to the input of the second stage, and the output of the second stage is electrically disconnected from the input of the third stage, wherein the first dummy line is located at output terminals of the dummy, first, second and third stages, the third dummy line is located at input terminals of the dummy, first, second and third stages and the second dummy line is located between the third dummy line and the input terminals of the dummy, first, second and third stages, wherein if the second stage fails to operate in a normal manner, the first dummy line is connected to the output line of the dummy stage and to the output line of the second stage, respectively, the second dummy line is connected to the input line of the dummy stage and to the input line of the second stage, respectively, and the third dummy line is electrically connected to the output line of the dummy stage and to the input line of a next stage of the second stage, and wherein when a laser is irradiated between the output terminal of the second stage and a crossing point of the input of the third stage and the output of the second stage so that the crossing point is disconnected from the second stage, the output of the dummy stage and the input of the third stage are electrically connected through the first dummy line.