Active matrix electroluminescent display devices, and their manufacture

摘要

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. In order to reduce parasitic capacitance in the circuit substrate, the invention forms these barriers ( 210 ) with metal or other electrically conductive material ( 240 ) that provides at least part of the signal lines ( 160 ) at a higher level than the circuit substrate ( 100 ). This conductive barrier material ( 240 ) is connected to the matrix circuitry within the substrate ( 100 ) but is insulated ( 40 ) at least at the sides adjacent to the LEDs ( 25 ). Preferably, an inter-capacitance guard line ( 9 ) is included in the circuit substrate ( 100 ) between the signal lines ( 160 ) and the circuitry in the substrate ( 100 ).