An organic light-emitting diode (OLED) array substrate and a display apparatus are disclosed. The OLED array substrate includes a plurality of OLEDs. The OLED includes an anode, a light-emitting layer and a cathode which are provided in this order, and further includes an exciton barrier layer which is arranged between the anode and the light-emitting layer and is in contact with the light-emitting layer. A forming material of the light-emitting layer includes a host material and a guest material which is doped in the host material, and the light-emitting layers of the OLEDs are configured for emitting light of a plurality of colors. A forming material of the exciton barrier layer includes a host material of one light-emitting layer that has a maximum highest occupied molecular orbital energy level amongst the host materials of all light-emitting layers.