Microfluidic chip having grounding trace and manufacturing method thereof, and microfluidic device

A manufacturing method of a microfluidic chip, comprising forming a first substrate structure, wherein forming the first substrate structure comprises:

• forming a plurality of pin areas which comprises a first pin area and a second pin area;
• forming a detection area comprising:
• a plurality of first scan lines extending along a first direction, wherein each first scan line of the plurality of first scan lines is connected to the first pin area through a first scan trace corresponding to each first scan line,
• a plurality of first data lines extending along a second direction different from the first direction, wherein each first data line of plurality of first data lines is connected to the second pin area through a first data trace corresponding to each first data line, and
• a plurality of detection units, each of which comprising a first switching transistor, a driving electrode connected to the first switching transistor, and a first hydrophobic layer located above the driving electrode, wherein the first switching transistor is connected to a first scan line of the plurality of first scan lines corresponding to the first switching transistor and connected to a first data line of the plurality of first data lines corresponding to the first switching transistor;
• and
• forming a grounding trace surrounding the detection area, connected to at least one of the plurality of detection units and connected to one of the plurality of pin areas.