Oled substrate structure

An OLED substrate structure, comprising:

• a base substrate and
• a bank layer disposed on the base substrate;
• wherein the bank layer comprises a plurality of accommodating grooves arranged in array in a region corresponding to an effective display area of the OLED and a recess arranged surrounding all the accommodating grooves in a region corresponding to a periphery of the effective display area of the OLED;
• wherein one of the accommodating grooves corresponds to one pixel, applied to accommodate an OLED organic functional layer;
• wherein the recess comprises a first recess, a second recess, a third recess, and a fourth recess;
• the first recess, the second recess, the third recess, and the fourth recess are combined in a rectangular frame shape;
• and the first recess, the second recess, the third recess, and the fourth recess respectively occupy one of sides of the rectangular frame shape;
• wherein each of the first recess, the second recess, the third recess, and the fourth recess comprises at least two independent branch recesses;
• wherein the recess has a width of 0.1 mm to 50 mm;
• wherein a distance between the recess and a corresponding accommodating groove located at the outermost edge of the effective display area of the OLED is 0.01 mm to 10 mm.