Display substrate and display device

A display substrate, comprising:

• a base substrate, comprising a first display region, a second display region and a third display region, wherein the first display region comprises a plurality of first light emitting unit groups and a plurality of first pixel circuit groups respectively connected with the plurality of first light emitting unit groups, the second display region comprises a plurality of second light emitting unit groups, a plurality of second pixel circuit groups and a plurality of third pixel circuit groups, the plurality of second light emitting unit groups are respectively connected with the plurality of second pixel circuit groups, the third display region comprises a plurality of third light emitting unit groups, which are respectively connected with the plurality of third pixel circuit groups, and a density of the plurality of second light emitting unit groups and a density of the plurality of third light emitting unit groups are both smaller than a density of the plurality of first light emitting unit groups, each light emitting unit group comprises a plurality of light emitting units, and each of the light emitting units comprises a first electrode, a light emitting layer, and a second electrode which are sequentially arranged along a direction perpendicular to the base substrate, and the second electrode is on a side of the light emitting layer facing the base substrate,
• wherein the second electrode of each of the light emitting units comprises a main body electrode and a connection electrode, the connection electrode is configured to connect a pixel circuit, and each light emitting unit group located in display regions comprises a plurality of light emitting units of different colors;
• among the light emitting units of a same color, an area of the main body electrode of at least one light emitting unit located in a non-edge region of the second display region is greater than an area of at least one main body electrode located in the first display region.