Abstract: A portion of a transparent substrate corresponding to a defective pixel of a liquid crystal panel is protruded like a dome to a suction hole by decompressing the interior of a vacuum suction head. As a result, the gap between the transparent substrates of the portion corresponding to the defective pixel of the liquid crystal panel becomes greater than that in a surrounding portion. In this state, a laser beam is radiated to the dome-like deformed portion of the transparent substrate in the portion corresponding to the defective pixel, so that a bubble is generated in a liquid crystal layer. The bubble expands in a region shaped like a circle centered at the point where the gap between the transparent substrates is the greatest, on a cross section parallel to the transparent substrates. Thus, the size of the bubble and the range where a substance is scattered are limited, thereby accurately correcting the defective pixel and improving the display quality after the correction.