Organic light-emitting diode display substrate, display panel and manufacturing method thereof, and display device

1 . An organic light-emitting diode (OLED) display panel, comprising:

a display substrate comprising a display region and a non-display region surrounding the display region, wherein the non-display region comprises an auxiliary region, the auxiliary region surrounding edges of the display region, and the auxiliary region and the display region are configured for inkjet printing simultaneously in a time-synchronized manner;

a retaining wall which is in the non-display region and surrounds the display region, wherein the retaining wall is disposed around outer edges of the auxiliary region;

a sacrificial layer disposed in the entire auxiliary region and configured to carry printing ink during the inkjet printing and remove an organic layer upon forming the organic layer by drying;

a plurality of light-emitting structures in the display region, wherein each of the light-emitting structures comprises an organic light-emitting functional layer; and

the organic layer on the sacrificial layer, wherein the organic layer and the organic light-emitting functional layer are in a same layer;

wherein the sacrificial layer is made of a soluble resin, plastic or rubber material in a solvent, the organic light-emitting functional layer is insoluble in the solvent, such that when the sacrificial layer is dissolved by the solvent, an entire layer structure of the organic layer is capable of being retained and removed from the display substrate.

2 . The OLED display substrate according to claim 1 , wherein the soluble material comprises at least one of polyethylene glycol, polycaprolactone, polyvinyl alcohol, polyvinylpyrrolidone, and polymethyl methacrylate.

3 . The OLED display substrate according to claim 1 , further comprising a pixel defining layer; wherein

the pixel defining layer is in the display region; or

the pixel defining layer is in a region surrounded by the retaining wall, and defines a plurality of auxiliary pixel regions in a region between the retaining wall and the display region, wherein the sacrificial layer is in the auxiliary pixel region.

4 . The OLED display substrate according to claim 1 , further comprising a moisture and oxygen barrier layer in the non-display region, wherein the moisture and oxygen barrier layer covers a surface of the retaining wall.

5 . The OLED display substrate according to claim 4 , wherein the moisture and oxygen barrier layer further covers a surface of the display substrate on at least one side of the retaining wall.

6 . A display device, comprising the OLED display panel as defined in claim 1 .

7 . A method for manufacturing an organic light-emitting diode (OLED) display panel, comprising:

forming a retaining wall on a display substrate, wherein the display substrate comprises a display region and a non-display region surrounding the display region, and the retaining wall is in the non-display region and surrounds the display region, wherein the non-display region comprises an auxiliary region, the auxiliary region surrounding edges of the display region, and the auxiliary region and the display region are configured for inkjet printing simultaneously in a time-synchronized manner, wherein the retaining wall is disposed around outer edges of the auxiliary region;

forming a sacrificial layer disposed in the entire auxiliary region and configured to carry printing ink during the inkjet printing and remove an organic layer upon forming the organic layer by drying;

forming a printed film layer on the display substrate by the inkjet printing, wherein a printing region covers a region surrounded by the retaining wall;

forming a residual layer of the sacrificial layer between the side of the retaining wall facing towards the display region and the edge of the display region by removing the printed film layer from the sacrificial layer;

obtaining a plurality of light-emitting structures by forming an electrode layer on the printed film layer in the display region, wherein each of the light-emitting structures comprises an organic light-emitting functional layer; and

forming a packaging structure on the display substrate by packaging the display substrate, wherein the packaging structure covers the plurality of light-emitting structures and is connected to the residual layer and the display substrate;

wherein the sacrificial layer is made of a soluble resin, plastic or rubber material in a solvent, the organic light-emitting functional layer is insoluble in the solvent, such that when the sacrificial layer is dissolved by the solvent, an entire layer structure of the organic layer is capable of being retained and removed from the display substrate.

8 . The method according to claim 7 , wherein removing the printed film layer from the sacrificial layer comprises:

dripping the solvent for dissolving the sacrificial layer into the printed film layer on the sacrificial layer;

adhering the printed film layer on the sacrificial layer by an imprinting mold upon softening the sacrificial layer; and

obtaining the residual layer by drying the solvent.

9 . The method according to claim 8 , wherein the imprinting mold comprises a printing plate adapted to the printed film layer on the sacrificial layer, wherein an adhesive is applied on the printing plate for adhering the printed film layer on the sacrificial layer.

10 . The method according to claim 7 , wherein forming the retaining wall on the display substrate comprises:

forming a resin material film layer on the display substrate; and

obtaining the retaining wall and a pixel defining layer by patterning the resin material film layer, wherein

the pixel defining layer is located in the display region; or the pixel defining layer is located in a region surrounded by the retaining wall, and defines a plurality of auxiliary pixel regions in a region between the retaining wall and the display region.