Display substrate, preparation method and brightness compensation method therefor, and display apparatus

A preparation method for a display substrate, comprising:

• forming a drive structure layer on a substrate, wherein the drive structure layer comprises a pixel drive circuit;
• forming a light-emitting element on the drive structure layer, wherein the light-emitting element comprises a first electrode, an organic functional layer and a second electrode which are stacked on the drive structure layer, and the first electrode is connected with the pixel drive circuit;
• and
• forming a light detection unit on the light-emitting element wherein the light detection unit is disposed in a direction of light-emitting of the light-emitting element, to detect brightness of the light-emitting element, and the light detection unit comprises a third electrode, a photosensitive active layer and a fourth electrode which are stacked;
• wherein the display substrate further comprises a capping layer, and forming the light detection unit on the light-emitting element comprises:
• forming the capping layer on the second electrode;
• forming the third electrode of the light detection unit on the capping layer, wherein the third electrode of the light detection unit is an integrated structure for different pixel units and connected with a low voltage line in a peripheral region of the display substrate;
• forming the photosensitive active layer on the third electrode;
• and
• forming the fourth electrode on the photosensitive active layer.

A brightness compensation method for a display substrate comprising a plurality of display regions, wherein the display substrate comprises:

• a drive structure layer disposed on a substrate, a light-emitting element disposed on the drive structure layer, and a light detection unit disposed on the light-emitting element wherein the light detection unit disposed in the direction of light emitting of the light emitting element to detect brightness of the light emitting element;
• wherein the drive structure layer comprises a pixel drive circuit, the light-emitting element comprises a first electrode, an organic functional layer and a second electrode which are stacked on the drive structure layer, and the first electrode is connected with the pixel drive circuit;
• and
• the light detection unit comprises a third electrode, a photosensitive active layer and a fourth electrode which are stacked;
• the display substrate further comprising:
• a capping layer disposed between the second electrode and the third electrode;
• wherein the third electrode of the light detection unit is disposed on the capping layer, wherein the third electrode of the light detection unit is an integrated structure for different pixel units and connected with a low voltage line in a peripheral region of the display substrate;
• wherein the method comprises:
• collecting brightness information of each display region;
• and
• comparing the brightness information of the plurality of display regions, and compensating brightness of a corresponding display region according to a comparison result.