The electro-optical device applied as an image display device comprises a first substrate (1) having a plurality on non-overlapping first electrodes (5) on a major surface (1a) thereof, and a second substrate (2) opposed to the first substrate (1) and having a plurality of non-overlapping second electrodes (7) on a major surface thereof, wherein the second electrodes (7) are disposed substantially perpendicular to the first electrodes (5). This device further comprises an electro-optical material layer (3) disposed between the first and second electrodes (5,7); and a discharge chamber (4) disposed between the electro-optical material layer (3) and the second substrate (2), and filled with an ionizable gas, the discharge chamber having a plurality of scanning units (P1, P2,...), the scanning units being divided by partition walls (9) formed by printing process. By formation of grooves by the printing process, a difficult process of etching of grooves or the formation of electrodes into grooves is unnecessary, and the manufacturing becomes easy. This is advantageous for the implementation of large display screens or for miniaturization.