Physical barriers (210) are present between neighbouring pixels (200) on a circuit substrate (100) of an active-matrix electroluminescent display device, particularly with LEDs (25) of organic semiconductor materials. The invention forms these barriers (210) with metal or other electrically-conductive material (240) that serves as an interconnection between a first circuit element (21, 4, 5, 6, 140, 150, 160, T1, T2, Tm, Tg, Ch) of the circuit substrate and a second circuit element (400, 400s, 23), for example, a sensor (400s) of a sensor array supported over the pixel array. The conductive barrier material (240) is insulated (40) at the sides of the barriers adjacent to the LEDs and has an un-insulated top connection area (240t) at which the second circuit element is connected to the conductive barrier material (240).
