Display device, display panel and manufacturing method thereof, driving circuit and driving method

A display device comprising a display panel, wherein the display panel comprises:

• a driving backplane, comprising multiple pixel driving circuits;
• and
• a light emitting device layer, comprising multiple light emitting units distributed in an array, wherein each light emitting unit comprises multiple light emitting devices stacked in a direction away from the driving backplane, and light emitting devices other than a light emitting device closest to the driving backplane in a direction perpendicular to the driving backplane are transparent devices;
• and
• wherein in the same light emitting unit, at least part of the light emitting devices are coupled to the pixel driving circuits for emitting light under driving of the pixel driving circuits, and at least two light emitting devices in the same light emitting unit have different light emitting materials,
• wherein the number of light emitting devices in the same light emitting unit is three, comprising a first light emitting device, a second light emitting device and a third light emitting device distributed in the direction away from the driving backplane;
• wherein the driving backplane comprises a pixel region and an edge region located outside the pixel region, each pixel driving circuit is located in the pixel region, and the edge region is provided with multiple peripheral circuits;
• the first light emitting device, the second light emitting device and the third light emitting device are all located in the pixel region, and a first electrode layer of the first light emitting device is coupled to one of the pixel driving circuits;
• a second electrode layer of the first light emitting device extends from the pixel region to the edge region, and is coupled to one of the peripheral circuits;
• a second electrode layer of the second light emitting device is coupled to another pixel driving circuit;
• and
• a second electrode layer of the third light emitting device extends from the pixel region to the edge region, and is coupled to another peripheral circuit.

A manufacturing method for a display panel, comprising:

• forming a driving backplane comprising multiple pixel driving circuits;
• and
• forming a light emitting device layer on a side of the driving backplane, wherein the light emitting device layer comprises multiple light emitting units distributed in an array, each light emitting unit comprises multiple light emitting devices stacked in a direction away from the driving backplane, and light emitting devices other than a light emitting device closest to the driving backplane in a direction perpendicular to the driving backplane are transparent devices;
• wherein in the same light emitting unit, at least part of the light emitting devices are coupled to the pixel driving circuits for emitting light under driving of the pixel driving circuits, and at least two light emitting devices in the same light emitting unit have different light emitting materials,
• wherein the number of light emitting devices in the same light emitting unit is three, comprising a first light emitting device, a second light emitting device and a third light emitting device distributed in the direction away from the driving backplane, the driving backplane comprises a pixel region and an edge region located outside the pixel region, each pixel driving circuit is located in the pixel region, and the edge region is provided with multiple peripheral circuits;
• the forming the light emitting device layer on the side of the driving backplane comprises:
• forming a pixel definition layer on a surface of the driving backplane, wherein the pixel definition layer covers at least the pixel region and is disposed on the same side of the driving backplane as a first electrode layer of the first light emitting device, and the pixel definition layer is provided with multiple openings exposing the first electrode layer of each first light emitting device, respectively;
• forming a light emitting functional layer of the first light emitting device on a surface of the pixel definition layer away from the driving backplane, wherein an orthographic projection of the first electrode layer of the first light emitting device on the driving backplane is within an orthographic projection of the light emitting functional layer of the first light emitting device on the driving backplane;
• forming a second electrode layer of the first light emitting device on a surface of the light emitting functional layer of the first light emitting device away from the driving backplane, wherein the orthographic projection of the light emitting functional layer of the first light emitting device on the driving backplane is within an orthographic projection of the second electrode layer of the first light emitting device on the driving backplane, and the second electrode layer of the first light emitting device extends from the pixel region to the edge region, and is coupled to one of the peripheral circuits;
• forming a light emitting functional layer of the second light emitting device on a surface of the second electrode layer of the first light emitting device away from the driving backplane, wherein the light emitting functional layer of the second light emitting device extends at least to the opening;
• forming a second electrode layer of the second light emitting device on a surface of the light emitting functional layer of the second light emitting device away from the driving backplane, wherein an orthographic projection of the second electrode layer of the second light emitting device in the opening and an orthographic projection of the light emitting functional layer of the second light emitting device in the opening are at least partially overlapped, and the second electrode layer of the second light emitting device is coupled to one of the pixel driving circuits;
• forming a light emitting functional layer of the third light emitting device on a surface of the second electrode layer of the second light emitting device away from the driving backplane, wherein an orthographic projection of the second electrode layer of the second light emitting device on the driving backplane is within an orthographic projection of the light emitting functional layer of the third light emitting device on the driving backplane;
• and
• forming a second electrode layer of the third light emitting device on a surface of the light emitting functional layer of the third light emitting device away from the driving backplane, wherein an orthographic projection of the second electrode layer of the third light emitting device in the opening and the orthographic projection of the second electrode layer of the second light emitting device in the opening are at least partially overlapped, and the second electrode layer of the third light emitting device extends from the pixel region to the edge region, and is coupled to another peripheral circuit.