Backplane, display substrate and display device

A backplane, comprising:

• a transparent substrate;
• an electrode layer provided on a side of the transparent substrate and comprising a plurality of signal transmission lines;
• a plurality of micro-display light emitting devices provided on a side, facing away from the transparent substrate, of the electrode layer, electrically coupled to the signal transmission lines, and capable of emitting light towards the transparent substrate;
• a protective layer provided on a side, facing away from the transparent substrate, of the micro-display light emitting devices;
• and
• a driving module provided on a side, facing away from the transparent substrate, of the protective layer, and electrically coupled to the signal transmission lines,
• wherein the micro-display light emitting devices comprise Mini-LEDs and Micro-LEDs, a quantum dot film layer is provided on a side of the transparent substrate facing away from the electrode layer, a reflective layer is provided between the transparent substrate and the quantum dot film layer, and a side of the reflective layer facing away from the transparent substrate is a reflective surface,
• wherein openings are formed in areas of the electrode layer facing the micro-display light emitting devices in a direction perpendicular to the transparent substrate, and
• wherein all of the micro-display light emitting devices constitute a plurality of pixels, each of the pixels comprises a first micro-display light emitting device, a second micro-display light emitting device and a third micro-display light emitting device, each of the first micro-display light emitting device, the second micro-display light emitting device and the third micro-display light emitting device emits a predetermined color light,
• a first light conversion material is formed in the opening of the electrode layer between the first micro-display light emitting device and the transparent substrate,
• a second light conversion material is formed in the opening of the electrode layer between the second micro-display light emitting device and the transparent substrate,
• the first light conversion material is configured to convert the predetermined color light into a first color light, and the second light conversion material is configured to convert the predetermined color light into a second color light.

A backplane, comprising:

• a transparent substrate;
• an electrode layer provided on a side of the transparent substrate and comprising a plurality of signal transmission lines;
• a plurality of micro-display light emitting devices provided on a side, facing away from the transparent substrate, of the electrode layer, electrically coupled to the signal transmission lines, and capable of emitting light towards the transparent substrate;
• a protective layer provided on a side, facing away from the transparent substrate, of the micro-display light emitting devices;
• and
• a driving module provided on a side, facing away from the transparent substrate, of the protective layer, and electrically coupled to the signal transmission lines,
• wherein the backplane further comprises a second insulating layer, the electrode layer comprises a first part between the second insulating layer and the transparent substrate, and a second part on a side of the second insulating layer away from the transparent substrate, the first part and the second part of the electrode layer are electrically coupled through a via hole penetrating through the second insulating layer,
• the micro-display light emitting devices comprise at least one of Mini-LEDs and Micro-LEDs, and the micro-display light emitting devices are electrically coupled to the second part of the electrode layer,
• the backplane further comprises a connecting electrode, the driving module is electrically coupled to the signal transmission lines through the connecting electrode, and the connecting electrode comprises at least part of the second part of the electrode layer,
• wherein the backplane is divided into an active area and an edge area surrounding the active area;
• a part of the protective layer in the edge area is provided with a via hole communicated to the signal transmission lines, the connecting electrode is provided in the via hole, the connecting electrode extends to a side, facing away from the transparent substrate, of the protective layer, and the driving module is coupled to the signal transmission lines through the connecting electrode,
• wherein the connecting electrode comprises a first connecting sub-electrode and a second connecting sub-electrode, the first connecting sub-electrode is a part of the second part of the electrode layer, and the second connecting sub-electrode is on a side of the first connecting sub-electrode away from the transparent substrate.