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

A method for 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 insulating layer;
• forming a channel layer on the first insulating layer, the channel layer comprising a semi-conductor 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 insulating layer with a second insulating layer;
• and
• forming a first conductive layer on the second insulating layer;
• forming a first through hole in the second insulating layer by laser, extending the first through hole through the second insulating 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 insulating layer and the though hole by a third insulating layer, the third insulating layer partially formed in the through hole;
• forming a second conductive layer on the third insulating layer;
• coupling the first conductive layer to the second conductive layer by laser;
• and
• forming a second through hole in the third insulating 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.