Array substrate with auxiliary gate metal pattern for common electrode connection and method for manufacturing the same, touch display panel and touch display device

A touch display panel, comprising:

• an array substrate, wherein the array substrate comprises:
• a substrate;
• a gate metal layer arranged on the substrate, the gate metal layer comprising a gate line and a patterned auxiliary metal;
• a source and drain metal layer, the source and drain metal layer comprising source signal lines and touch signal lines, and the source and drain metal layer being separated from the gate metal layer by an insulating layer;
• a planarization layer arranged on the source and drain metal layer;
• and
• a common electrode arranged on the planarization layer,
• wherein the patterned auxiliary metal is electrically connected to the touch signal lines through first holes penetrating the insulating layer, and is electrically connected to the common electrode through second holes penetrating the insulating layer and third holes penetrating the planarization layer, and
• a plurality of touch units arranged in an array, each of the plurality of touch units comprises at least one touch signal line, and each of the at least one touch signal line is electrically connected to the common electrode through a plurality of fourth holes penetrating the planarization layer.

A method for manufacturing an array substrate, comprising:

• forming a gate metal layer on a substrate, and patterning the gate metal layer to form a gate line and a patterned auxiliary metal;
• forming an insulating layer on the gate metal layer, and patterning the insulating layer to form a plurality of first holes and a plurality of second holes penetrating the insulating layer;
• forming a source and drain metal layer on the insulating layer, and patterning the source and drain metal layer to form source signal lines and touch signal lines, wherein the touch signal lines are electrically connected to the patterned auxiliary metal through the plurality of first holes;
• forming a planarization layer on the source and drain metal layer, and patterning the planarization layer to form a plurality of third holes penetrating the planarization layer;
• and
• forming a common electrode layer on the planarization layer, wherein the patterned auxiliary metal is electrically connected to the common electrode layer through the plurality of second holes and the plurality of third holes,
• wherein the patterning the planarization layer to form the plurality of third holes penetrating the planarization layer comprises:
• patterning the planarization layer to form the plurality of third holes and a plurality of fourth holes penetrating the planarization layer, wherein the plurality of third holes is arranged to be communicated with the plurality of second holes respectively, each of the plurality of fourth holes is arranged between the touch signal lines and the planarization layer, and each of the touch signal lines is electrically connected to the planarization layer through one corresponding of the plurality of fourth holes.