Display substrate, manufacturing method thereof, intermediate substrate, and electronic paper display apparatus

A display substrate, comprising:

• a base substrate comprising a display region and a bezel region on at least one side of the display region;
• a plurality of test sub-terminals in the bezel region, comprising a common voltage test sub-terminal and a plurality of non-common voltage test sub-terminals;
• and
• a first electrostatic ring in the bezel region, through which the plurality of non-common voltage test sub-terminals are arranged in series and/or grounded,
• wherein the first electrostatic ring comprises a first connection end and a second connection end;
• the first electrostatic ring comprises four transistors, wherein a gate of a first transistor, a first electrode of the first transistor, and a first electrode of a second transistor are electrically connected together to serve as the first connection end;
• a second electrode of the first transistor, a second electrode of the second transistor, a gate of the second transistor, a gate of a third transistor, a first electrode of the third transistor, and a first electrode of a fourth transistor are electrically connected together;
• a gate of the fourth transistor, a second electrode of the fourth transistor, and a second electrode of the third transistor are electrically connected together to serve as the second connection end.