DEVICE AND METHOD FOR INSPECTING LIQUID CRYSTAL DRIVE SUBSTRATE

PROBLEM TO BE SOLVED: To secure sufficient writing time without reducing throughput by picking up the surface image of an electro-optic element plate, adding and generating images over a plurality of frames during each polarity period of a bias voltage, and identifying the failed part of a pixel electrode. SOLUTION: An image-processing device generates an image to be inspected to be subjected to image processing by adding continuous four-frame voltage images up to frames A-D related to the surface of a modulator. In this case, a bias voltage EB is set to a negative polarity, for example, during the image pick-up period of A and C frames and a data voltage ED of each frame is set to a completely different value. The voltage ED is set to values that differ from a specific voltage Ea in the frame A. The voltage ED is set to a value where a voltage Δea is added to the voltage Ea in the frame A, a value where a voltage Δeb is added to the voltage Ea in the frame B, a value where a voltage Δec is subtracted from the voltage Ea in the frame C, and a value where a voltage Δed is subtracted from the voltage Ea in the frame D.