the driving circuit 280 can be formed by using a voltage programming or current programming driving circuit and it controls the current flowing to the organic el element 240 according to images signals applied to the data line to thereby represent desired images when a select signal is applied from the scan line the first electrode layer forming the anode is formed to be superimposed on the power source line 250 since a constant power source voltage is applied to the power source line 250 a minor variation of data applied to the first electrode layer substantially causes no influence to the power source line 250 therefore when the first electrode layer is formed to be superimposed on the power source line 250 the organic eml is formed more widely and the aperture ratio of the organic el display device is improved fig5 shows a detailed plan view of a pixel circuit according to an exemplary embodiment of the present invention and fig6 shows a cross sectional view of the part of b b u2032 of the pixel circuit of fig5 as shown in fig5 and 6 a driving circuit 180 comprises a driving transistor 120 for controlling the current flowing to the organic el element 140 according to the voltage applied to a gate a switching transistor 110 for transmitting image signals applied to the data line d 1 to the driving transistor 120 in response to a select signal and a.