An OLED display comprising a substrate; at least one heat insulating layer disposed over the substrate; a first electrode located over the heat insulating layer and having a thermal conductivity higher than the heat insulating layer; a plurality of thermal contacts provided through the heat insulating layer between the first electrode and the substrate, the thermal contacts comprising material having a thermal conductivity higher than that of the heat insulating layer; one or more organic layers, at least one of which is a light emissive layer, disposed over the first electrode; and a second electrode disposed over the one or more organic layers.