Pixel arrangement structure and display substrate

A pixel arrangement structure, a display substrate and a mask group are disclosed. The pixel arrangement structure includes a plurality of pixel groups, each of the plurality of pixel groups includes one red sub-pixel, two green sub-pixels and one blue sub-pixel; the red sub-pixel and the blue sub-pixel are arranged along a first direction; the two green sub-pixels are arranged along a second direction. Four vertexes included in the red sub-pixel are located in a first virtual rhombus and are substantially coincident with four vertexes of the first virtual rhombus, respectively; four vertexes included in the blue sub-pixel are located in a second virtual rhombus and are substantially coincident with four vertexes of the second virtual rhombus, respectively; at least one of the red or the blue sub-pixel has a shape of a corresponding virtual rhombus with each side of the virtual rhombus being an inwardly concaved side.