Display device and manufacturing method of the same

A manufacturing method of a display device comprising:

• a film forming step in which a plurality of films including an insulation film, a semiconductor film and a conductive film are stacked onto a substrate;
• and
• a defect portion correcting step in which at least one correction out of a short-circuit defect portion separation correction which separates a short-circuit defect, an open defect portion connection correction which performs a connection of an open defect, a standard deviation defect portion removal correction which performs a removal of a standard deviation defect, and a standard deviation defect portion separation correction which performs a separation of a standard deviation defect portion generated in the formed film is performed, wherein
• at a point of correction time of the defect portion correction step, at least one upper-layer film is present above a film to be corrected at the correction portion and the correction is applied to the film to be corrected while leaving the upper-layer film as it is,
• the correction is performed by irradiating laser beams,
• an output of the laser beams is set to 0.02 W/cm2 or less,
• the laser beams are irradiated from above the substrate through the upper-layer film to the correction portion, and
• a wavelength of the laser beams is set to a wavelength that allows the laser beams to be more easily absorbed in the film to be corrected than in the upper-layer film.