Display panel, display device, and preparation method for display panel

A display panel, having an active area and a non-active area, the non-active area being arranged around at least part of the active area, the display panel comprising:

• a substrate;
• a first planarization layer, arranged on one side of the substrate;
• a pixel defining layer, located on a side of the first planarization layer away from the substrate, the pixel defining layer comprising a plurality of pixel openings located in the active area and at least one second opening located in the non-active area, at least part of an orthographic projection of the second opening on the substrate being located within an orthographic projection of the first planarization layer on the substrate;
• a light-emitting device layer, comprising a plurality of light-emitting units located in the active area, at least part of the light-emitting unit being arranged in the pixel opening, and the light-emitting unit comprising an organic electroluminescent material;
• an encapsulation layer, located on a side of the pixel defining layer away from the substrate and covering at least part of the second opening;
• and
• an isolation member, located in the non-active area and separating the first planarization layer from the encapsulation layer, an orthographic projection of the isolation member on the substrate at least partially overlapping with the orthographic projection of the second opening on the substrate.

A preparation method for a display panel, the display panel having an active area and a non-active area, the non-active area being arranged around at least part of the active area, the preparation method comprising:

• providing a substrate on which a first planarization layer is provided;
• forming a first electrode layer on the first planarization layer, the first electrode layer comprising a plurality of first electrodes located in the active area and an isolation electrode located in the non-active area, the isolation electrode doubling as an isolation member;
• forming an isolation structure on a side of the first electrode layer away from the substrate, the isolation structure having a plurality of isolation openings located in the active area and at least one first opening located in the non-active area, an orthographic projection of the first opening on the substrate at least partially overlapping with an orthographic projection of the isolation electrode on the substrate;
• providing a light-emitting device layer by means of the isolation structure, the light-emitting device layer comprising a plurality of light-emitting units located in the active area, at least part of the light-emitting unit being arranged in the isolation opening;
• and
• forming an encapsulation layer on a side of the isolation structure away from the substrate, and the isolation member separating the first planarization layer from the encapsulation layer.