ACTIVE MATRIX TYPE LIQUID CRYSTAL DISPLAY PANEL AND ITS DEFECTIVE PIXEL DISCRIMINATION METHOD, AND ELEMENT SUBSTRATE FOR ACTIVE MATRIX TYPE LIQUID CRYSTAL DISPLAY PANEL AND ITS DEFECTIVE ELEMENT DISCRIMINATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide an active matrix type liquid crystal display panel with which presence/no presence of a pixel defect can be discriminated without using an expensive and large-scale evaluation device and an efficient aging test can be performed.;SOLUTION: A pixel capacitance element 104 for evaluation and a differential amplifying circuit 105 are provided to a liquid crystal cell which constitutes one pixel. When a pixel TFT 103 for switching is turned on and the charged pixel capacitance element 104 for evaluation has an appropriate charge holding function, when the differential amplifying circuit 105 operates, since voltage of a first input is higher than the voltage of a second input wherein a defect discrimination criterion signal 106 is inputted, the level of output of the differential amplifying circuit 105 is made high, and a pixel capacitance element 107 for display is charged and a liquid crystal 108 is displayed. When the pixel capacitance element 104 for evaluation does not have the appropriate charge holding function, when the differential amplifying circuit 105 operates, the level of its output is made low, the pixel capacitance element 107 for display is not charged and the liquid crystal 108 is not displayed.;COPYRIGHT: (C)2005,JPO&NCIPI