A lighting module has an OLED panel with two or more pairs of electrodes and a casing for mounting the OLED panel on the casing front side. The backside of the casing has two openings for providing access to one pair of electrodes (anode and cathode), each opening located near one of the opposing side edges to provide access to one of the electrodes. A connection component made of an electrically conductive material has two bent portions dimensioned for inserting into the openings of two adjacent lighting modules for providing mechanical and electrical connection between two adjacent modules. The length of the connection component is dimensioned for achieving a snug fit between two adjacent modules. One lighting module can be connected to one or two adjacent lighting modules in a one-dimensional array, or two to fourth adjacent lighting modules in a two-dimensional array.