Method for manufacturing thin film, thin film manufacturing apparatus and method for manufacturing display substrate

A method for manufacturing a display substrate, comprising:

• providing an organic light emitting diode (OLED) substrate;
• wherein the OLED substrate is provided with a plurality of gate lines, a plurality of data lines, a plurality of leads that are arranged in a non-display region of the OLED substrate and used to lead out the plurality of gate lines and the plurality of data lines, pixel electrodes and a pixel defining layer that defines a plurality of pixel regions;
• connecting the plurality of gate lines and the plurality of data lines to an electrode of an external power source via the leads in the non-display region of the OLED substrate and connecting the pixel electrodes to another electrode of the external power source via the leads;
• coating an ink in the plurality of pixel regions defined by the pixel defining layer;
• transferring the OLED substrate which has been coated with the ink to a drying chamber, turning on the external power source and applying a voltage to generate a control electric field, and adjusting a direction and an intensity of the voltage and controlling a drying speed to control solute in the ink to move away from four boundaries of each pixel region towards a center region of the each pixel region.