OLED Substrate and Manufacturing Method Thereof, Display Device and Manufacturing Method Thereof

A manufacturing method for an OLED substrate, comprising:

• forming, by a single patterning process, a pattern including first electrodes of OLED devices and a pixel defining layer provided above the first electrodes above a base substrate, wherein the pixel defining layer includes a plurality of pixel partition walls spaced apart from each other, each of the pixel partition walls defines one of the first electrodes.

An OLED substrate comprising a plurality of OLED devices, each of the OLED devices comprising a first electrode and a pixel defining layer provided on the first electrode, the pixel defining layer comprising a pixel partition wall, a boundary of an orthographic projection of the pixel partition wall on the base substrate coincides with a boundary of an orthographic projection of the first electrode of said each of the OLED devices on the base substrate.