Disclosed is a pixel arrangement structure, comprising a plurality of repeatedly arranged sub-pixel groups. Each sub-pixel group comprises: one first sub-pixel and two second sub-pixels sequentially arranged in the ith column, wherein i is a natural number; two third sub-pixels and one first sub-pixel sequentially arranged in the (i+1)th column; two second sub-pixels and one first sub-pixel sequentially arranged in the (i+2)th column; and one first sub-pixel and two third sub-pixels sequentially arranged in the (i+3)th column. Further disclosed is a display panel comprising pixels arranged according to the pixel arrangement structure, a display device comprising the display panel, and a set of masks for vapor-depositing an organic light-emitting material during fabrication of an organic light-emitting display panel.