METHOD FOR INSPECTING LIQUID CRYSTAL DISPLAY

摘要

PROBLEM TO BE SOLVED: To detect short-circuiting between a counter electrode and the ground safely and easily without reducing the productivity. SOLUTION: In a liquid crystal display for changing the potential of a picture element electrode by applying a modulation signal Ve(+) to a scanning signal wire w hile a switching element of an odd field is off and a modulation signal Ve(-) to the scanning signal wire while the switching element of an even field is off, the center value of a modulation signal amplitude Vepp=|Ve(+)-Ve(-)|is set to Vec= Ve(+)-V(-)}/2, the maximum value of an image signal voltage is set to Vs (H), and the minimum value is set to Vs (L). When Vs (H)+Vs (L) is not equal to 0 (V) and a counter electrode potential is Vt, the short- circuiting between the counter electrode and the ground is detected by a fluctuation Vec±ΔVec of an optimum Vec where the DC component of the liquid crystal application voltage between the counter electrode and a picture element electrode can be minimized under 1.5 (|Vt|)<=ΔVec<=25(|Vt|).