y 1 and y 240 toward the center electrodes y 120 and y 121 scanning as shown in fig9 c from both center electrodes y 120 and y 121 towards both ends y 1 and y 240 or scanning as shown in fig9 d from respective bottoms y 120 and y 240 towards both top electrodes y 1 and y 121 the duty factor of this color organic el display device according to the present embodiment can be modified easily from 1 120 to 1 60 2 120 so that the brightness of the display can be easily modified by a factor of two the resolution in the vertical direction can be retained within 80 of the original resolution in addition the brightness of the present color organic el display device can be adjusted easily by changing the control data of the row driving circuit 23 and the column driving circuits 22 a and 22 b as described above the image display device and the driving method thereof are explained for two embodiments of the present invention however the concrete constitution of the present invention is not limited to those embodiments and variants can be envisaged without exceeding the scope of the present invention for example although organic el elements are used.