Patent ID: 7227523

Claim:
A method for inspecting a liquid crystal display device having a plurality of data signal lines, a plurality of gate signal lines disposed intersection to the data signal lines, pixel transistors disposed at intersections of the data signal lines and the gate signal lines, and capacitors disposed at the intersections, the pixel transistors each having a control electrode, an input electrode, and an output electrode, at the intersections, the control electrodes of the pixel transistors being connected to the respective gate signal lines, the input electrodes of the pixel transistors being connected to the respective data signal lines, the output electrodes of the pixel transistors being connected to the respective capacitors, the method comprising the steps of: supplying different voltages to two data signal lines and storing the two different voltages to the capacitors through the respective pixel transistors connected to the two data signal lines; for each gate signal line, reading the voltages stored in the capacitors at the intersections of said gate signal line and the two data signal lines; comparing the voltages that are read with a comparing means; and detecting defective pixels based upon the result of said comparison.