Display panel, active matrix substrate, and method for repairing white defect of display panel

A method of repairing a white defect of a liquid crystal display (LCD) panel, the method comprising:

• providing a substrate defining a plurality of pixel areas by:
• forming a first metal layer on a base;
• covering the first metal layer with a first insulation layer;
• forming a channel layer on the first insulation layer, the channel layer comprising a semiconductor layer and an ohmic contact layer;
• forming a second metal layer on the channel layer, the second metal layer comprising a source electrode and a drain electrode, electrically coupling the source electrode to the drain electrode by the channel layer;
• covering the second metal layer, the channel layer, and the first insulation layer with a second insulation layer;
• and
• forming a first conductive layer on the second insulation layer;
• forming a first through hole in the second insulation layer by laser, extending the first through hole through the second insulation layer and separating the drain electrode into two parts which are spaced apart from each other;
• overlapping the channel layer with a first part of the two parts, and spacing a second part of the two parts apart from the channel layer;
• covering the first conductive layer, the second insulation layer and the though hole by a third insulation layer, the third insulation layer partially formed in the first through hole;
• forming a second conductive layer on the third insulation layer;
• penetrating the first conductive layer by laser to coupling the second conductive layer to the first conductive layer;
• and
• forming a second through hole in the third insulation layer, extending the second through hole to the drain electrode, and electrically coupling the first conductive layer to the second part by the second through hole.