OLED array substrate having black matrix, manufacturing method and display device thereof

A method of manufacturing an OLED array substrate, comprising:

• forming a pattern comprising a plurality of thin film transistors on a base substrate;
• forming a pattern comprising a color filter layer below a black matrix;
• forming a pattern comprising both a first protection layer and the black matrix, wherein the first protection layer and the black matrix are disposed in a same layer, the black matrix being located over each thin film transistor and provided with a via, the the black matrix overlaps the color filter layer partially, and the via penetrates a portion where the black matrix overlaps the color filter layer partially;
• and
• forming a pattern on the black matrix, the pattern comprising a first electrode, a barrier, a luminescent layer, and a second electrode, wherein the first electrode is connected with the thin film transistor through the via, and the first electrodes disposed over adjacent thin film transistors are separated from each other by the barrier.