Electro-optical device having a LED pixel matrix, the pixels being supplied with electrical power by means of a first and a second rectangular conductive plane (P1, P2) which are located on both sides of the matrix and which have corresponding dimensions, the first conductive plane being supplied by two adjacent edges (b3, b4) and the second conductive plane being connected to a common electrical ground in order to provide a supply voltage by establishing a potential difference at each of the pixels of the matrix: - the first conductive plane comprising on each of two adjacent edges (b3, b4) a number greater than two of contact points which are regularly spaced apart and locally insulated from each other, and which are formed by cutting out the adjacent edges, and as many individual sources of voltage as contact points, which are arranged along the adjacent edges, each source powering a respective contact point, - the second conductive plane being mainly powered by two adjacent edges which correspond to the two adjacent edges of the first conductive plane and which are cut out to form contact points for the connection to a second supply voltage, - the individual voltage sources applying different respective voltage values to the contact points, and these values are such that they vary in a monotonous manner along each of the two adjacent edges between a first value (v h1, v v1) which is the one applied to a first contact point at the side of the junction between the two adjacent edges and a second value (v h6, v v6) which is the one applied to a last contact point at the other side of each of the edges, with a monotonic increasing variation for a conductive supply plane which provides current or with a monotonic decreasing variation for a conductive supply plane which absorbs current in order to minimise the potential difference established at each pixel which is a function of the distance thereof to the contact points, - the two planes being superimposed and their cut edges being such that each of the contact points of the second plane is superimposed on a gap between two contact points of the first conductive plane. - the first conductive plane comprising on each of two adjacent edges (b3, b4) a number greater than two of contact points which are regularly spaced apart and locally insulated from each other, and which are formed by cutting out the adjacent edges, and as many individual sources of voltage as contact points, which are arranged along the adjacent edges, each source powering a respective contact point, - the second conductive plane being mainly powered by two adjacent edges which correspond to the two adjacent edges of the first conductive plane and which are cut out to form contact points for the connection to a second supply voltage, - the individual voltage sources applying different respective voltage values to the contact points, and these values are such that they vary in a monotonous manner along each of the two adjacent edges between a first value (v h1, v v1) which is the one applied to a first contact point at the side of the junction between the two adjacent edges and a second value (v h6, v v6) which is the one applied to a last contact point at the other side of each of the edges, with a monotonic increasing variation for a conductive supply plane which provides current or with a monotonic decreasing variation for a conductive supply plane which absorbs current in order to minimise the potential difference established at each pixel which is a function of the distance thereof to the contact points, - the two planes being superimposed and their cut edges being such that each of the contact points of the second plane is superimposed on a gap between two contact points of the first conductive plane.