DISPLAY DEVICE AND TESTING METHOD THEREOF

摘要

A display device and a testing method thereof are provided to reduce fabrication cost and defective ratio of the display device by performing a VI(Visual Inspection) test on the state of a detection signal output unit for outputting a detection signal before driving IC(Integrated Circuit) are mounted on the display device. In a liquid crystal display panel assembly testing the state of a detection signal output unit(SOUT), there is provided a plurality of testing switching devices(TY1~TYN) in which input terminals and output terminals of the switching devices are connected between output data lines(OY1~OYN) and neighboring gate lines(G1~GN), respectively. There is also provided a plurality of testing switching devices(TX1~TXM) in which input terminals and output terminals of the switching devices are connected between output data lines(OX1-OXM) and neighboring data lines(D1~DM), respectively. A signal line(L1) transfers a switching-off current from a single chip(610) and a test pad(IP3) is connected to the signal line. A test line(L2) is connected to the test pad and all the control terminals of the testing switching devices(TY1~TYN). A test line(L3) is connected to all the control terminals of the testing switching devices(TX1~TXM) and is connected to the test line(L2) via a contact portion.