Display panel and preparation method, detection method and display device thereof

A method for detecting electrical properties of a display panel, the method comprising:

• conductively coupling an electrical test device to at least one test pad;
• and
• controlling the electrical test device to perform an electrical test on the electrodes of a transistor conductively coupled to the at least one test pad;
• wherein the display panel comprises:
• a display area comprising a plurality of pixels;
• and
• a non-display area surrounding the display area;
• wherein each of the plurality of pixels comprises a display pixel circuit;
• and
• the non-display area comprises one or more test pixel circuits, each of the one or more test pixel circuits having an equivalent circuit structure to the display pixel circuit, where the one or more test pixel circuits include a plurality of transistors, and electrodes of at least one of the plurality of transistors are respectively conductively coupled to different test pads.

A method of manufacturing a display panel, the method comprising:

• forming each film layer of a display pixel circuit on a base substrate;
• forming each film layer of one or more test pixel circuits on the base substrate;
• and
• forming test pads respectively conductively coupled to electrodes of at least one of a plurality of transistors in the one or more test pixel circuits;
• wherein the display panel comprises:
• a display area comprising a plurality of pixels;
• and
• a non-display area surrounding the display area;
• wherein each of the plurality of pixels comprises the display pixel circuit;
• and
• the non-display area comprises the one or more test pixel circuits, each of the one or more test pixel circuits having an equivalent circuit structure to the display pixel circuit, where the one or more test pixel circuits include the plurality of transistors, and the electrodes of the at least one of the plurality of transistors are respectively conductively coupled to different test pads.

A display device, comprising:

• a display panel, the display panel comprising:
• a display area comprising a plurality of pixels;
• and
• a non-display area surrounding the display area;
• wherein each of the plurality of pixels comprises a display pixel circuit;
• and
• the non-display area comprises one or more test pixel circuits, each of the one or more test pixel circuits having an equivalent circuit structure to the display pixel circuit, where the one or more test pixel circuits include a plurality of transistors, and electrodes of at least one of the plurality of transistors are respectively conductively coupled to different test pads, each of the different test pads being located in a test electrode layer of the one or more test pixel circuits.