Pixel arrangement structure, display substrate, and display device

A pixel arrangement structure, comprising a plurality of pixel groups;

• each of the plurality of pixel groups comprises a first sub-pixel, a second sub-pixel, a third sub-pixel and a fourth sub-pixel;
• in each of the plurality of pixel groups, a connection line between a center of the second sub-pixel and a center of the third sub-pixel is a first line segment, the first sub-pixel and the fourth sub-pixel are between the second sub-pixel and the third sub-pixel and are respectively at two sides of the first line segment;
• a connection line between a center of the first sub-pixel and a center of the fourth sub-pixel is a second line segment;
• a length of the second line segment is less than a length of the first line segment, the first line segment extends in the first direction and the second line segment extends in a second direction;
• a shape of the first sub-pixel comprises a first main body portion and a first protrusion, a size of the first protrusion in the first direction is smaller than a size of the first main body portion, a shape of the second sub-pixel comprises a second main body portion and a second protrusion, a size of the second protrusion in the first direction is smaller than a size of the second main body portion,
• in each of the plurality of pixel groups, a virtual straight line passing through a bottom edge of the first main body portion away from the first protrusion and extending in the first direction is overlapped with the second protrusion of the second sub-pixel, and not overlapped with the second main body portion of the second sub-pixel.