Display substrate and display device

A display substrate, having a first side for display and a second side opposite to the first side, and comprising a first display region, a second display region and a third display region;

• wherein,
• the first display region comprises a plurality of first pixel repeating units arranged in an array along a first direction and a second direction, each of the plurality of first pixel repeating units comprises a first light-emitting element, and the first display region comprises a light-transmitting region that allows a light to be transmitted between the first side and the second side of the display substrate;
• the second display region comprises a plurality of second pixel repeating units and a plurality of fourth pixel repeating units that are arranged as an array along the first direction and the second direction, each of the plurality of second pixel repeating units comprises a second pixel circuit and a second light-emitting element, the second pixel circuit is electrically connected to the second light-emitting element, and each of the fourth pixel repeating units comprises a first pixel circuit;
• the third display region comprises a plurality of third pixel repeating units arranged as an array along the first direction and the second direction, each of the plurality of third pixel repeating units comprises a third pixel circuit and a third light-emitting element, and the third pixel circuit is electrically connected to the third light-emitting element;
• the third display region at least partially surrounds the second display region, the second display region at least partially surrounds the first display region, and the second display region is axisymmetric with respect to a centerline of the first display region in the second direction;
• each of the plurality of first pixel repeating units corresponds to one of the plurality of fourth pixel repeating units, and a connection line of centers of each of the plurality of first pixel repeating units and a corresponding one of the plurality of fourth pixel repeating units is substantially parallel to the first direction, the first light-emitting element in each of the plurality of first pixel repeating units is electrically connected to the first pixel circuit in the corresponding one of the plurality of the fourth pixel repeating units through a transparent connection wire, a number of the transparent connection wire is t, t is a positive integer and t≥1;
• a pitch of the plurality of first pixel repeating units in the second direction is b1, a pitch of the plurality of second pixel repeating units in the second direction is b1, and a pitch of the plurality of third pixel repeating units in the second direction is b2, wherein, b1=n*b2, n is a positive integer and n≥2;
• wherein a pitch of the transparent connection wire in the second direction is D, and a maximum number s of the plurality of first pixel repeating units included in the first display region in the first direction satisfies:
• s≤2*Floor (b1/((D*t))), where Floor ( ) represents a round down function.