OLED SUBSTRATE STRUCTURE

An OLED substrate structure including a base substrate (1) and a bank layer (3) disposed on the base substrate (1) is provided; the bank layer (3) includes a plurality of accommodating grooves (31) arranged in array corresponding to a region of an effective display area (AA) of the OLED and a recess (33) arranged surrounding all the accommodating grooves (31) in a region corresponding to the periphery of the effective display area (AA) of the OLED; one of the accommodating grooves (31) corresponds to one pixel (P), applied to accommodate an OLED organic functional layer (D); due to the disposition of the recess (33), the OLED substrate structure of the disclosure can make the ambient atmosphere around the pixels in each area uniform when the OLED device is fabricated by printing, and volatilize the solvent uniformly to improve an uniformity of a film thickness of the OLED organic functional layer.