Display Substrate and Display Apparatus

A display substrate having a display area and a bonding region, the bonding region being located on a side of the display area in a first direction;

• the display substrate comprising:
• a substrate;
• a plurality of signal lines located on the substrate, wherein the signal lines are located at least in the display area;
• the plurality of signal lines include a plurality of first-type signal lines and a plurality of first-type fan-out lines;
• and the first-type signal lines are configured to receive a constant voltage electrical signal;
• and
• a light-shading layer located on a side of the plurality of signal lines away from the substrate and located in the display area;
• the light-shading layer including a plurality of first openings, wherein
• the display area includes a main display region and a secondary display region located on a side of the main display region;
• light transmittance of the secondary display region is greater than light transmittance of the main display region;
• the plurality of first openings are located in the secondary display region;
• orthographic projections of the plurality of first-type signal lines and the plurality of first-type fan-out lines on the substrate and orthogonal projections of the plurality of first openings on the substrate have no overlap;
• and a first-type fan-out line is located between two adjacent first-type signal lines.