Oled display panel, manufacturing method thereof and display device

An organic light-emitting diode (OLED) display panel, comprising a cover and a backplane which are cell-assembled, a plurality of color filter (CF) units, auxiliary cathodes, a planarization layer, a plurality of spacers and a transparent electrode layer, wherein

• the plurality of color filter (CF) units are arranged in an array on the cover;
• the auxiliary cathodes are filled into gaps among the CF units;
• the auxiliary cathodes comprise a black matrix (BM), a buffer layer and a metal layer which are sequentially disposed on the cover;
• the planarization layer is disposed on the auxiliary cathodes and the CF units;
• a plurality of openings are disposed in the planarization layer at locations corresponding to the auxiliary cathodes;
• the plurality of spacers are disposed on the planarization layer at the locations corresponding to the auxiliary cathodes, and abut against and support the cover and the backplane;
• the transparent electrode layer is disposed on the planarization layer and the spacers and is electrically communicated with the auxiliary cathodes via at least a part of the openings;
• and
• the plurality of color filter (CF) units of the cover are oppositely arranged to pixel regions of the backplane.