According to the present invention, an electrode is produced on a rigid or flexible support substrate comprising a grid network of very fine electrically-conducting lines with nodes and meshes so as to create a diffraction image which is as much as possible in the shape of an arc in the transmitted light and so that there is no high-level optical impact. The grid network can further be realised without direct ion preference with an number of three lines joining at each node and/or with conducting sections extending in the shape of an arc or a wave between the nodes.