Display substrate, test method for the same and display device

A display substrate, comprising a base substrate, a touch detection circuit layer and a pixel driving circuit layer, wherein

• the display substrate comprises a display region and a non-display region surrounding the display region;
• the touch detection circuit layer comprises a driving signal line and a dummy electrode line arranged side by side in the display region and insulated from each other, and both the driving signal line and the dummy electrode line extend from the display region to the non-display region;
• the non-display region is provided with a plurality of test pads comprising a first pad electrically connected to the driving signal line and a second pad electrically connected to the dummy electrode line;
• wherein the display substrate further comprises a common signal line arranged in the non-display region and surrounding the display region, the dummy electrode line is electrically connected to the common signal line in the non-display region, and the driving signal line and the common signal line are insulated from each other;
• wherein the display substrate further comprises a driving integrated chip (IC) arranged in the non-display region, the driving signal line is electrically connected to the driving IC at a first connecting point, the first pad is electrically connected to the first connecting point via a first control switch, and the first control switch is configured to control the first connecting point to be electrically connected to, or electrically disconnected from, the first pad;
• wherein the pixel driving circuit layer comprises a first transparent electrode, an insulating layer and a second transparent electrode laminated one on another in a direction away from the base substrate, the second pad is electrically connected to the dummy electrode line via a connecting trace, and the connecting trace is arranged at a same layer and made of a same material as the first transparent electrode or the second transparent electrode.