Manufacturing method for display substrate, display substrate, and display device

A manufacturing method for a display substrate, comprising:

• providing a base substrate, wherein the base substrate comprises a plurality of sub-pixel regions of different colors;
• printing a solution of a light-emitting functional layer in the plurality of sub-pixel regions, wherein volumes of the solution in sub-pixel regions of different colors are positively correlated with a saturated vapor pressure of the solution;
• and
• performing vacuum drying on the solution to form the light-emitting functional layer having a uniform film thickness.

A display substrate, comprising:

• a base substrate, comprising a plurality of sub-pixel regions of different light-emitting colors;
• a pixel defining layer, disposed on the base substrate, and comprising a pixel opening in each sub-pixel region;
• and
• a light-emitting functional layer, disposed on a side of the pixel defining layer facing away from the base substrate;
• wherein the light-emitting functional layer is at least partially located within the pixel opening, and the light-emitting functional layer in the pixel opening comprises a central region away from the pixel defining layer, a climbing region in contact with the pixel defining layer, and a transition region between the central region and the climbing region;
• wherein
• in a direction perpendicular to the base substrate, a difference between a thickness of the central region of the light-emitting functional layer and a target thickness of the light-emitting functional layer is less than or equal to 5 nm, a difference between a thickness of the transition region of the light-emitting functional layer and the target thickness of the light-emitting functional layer is greater than 5 nm and less than or equal to 20 nm, and a difference between a thickness of the climbing region of the light-emitting functional layer and the target thickness of the light-emitting functional layer is greater than 20 nm.