since current flows between top and bottom electrodes of an oled device when the lateral light emitting area is say halved the current through the device is also halved in fig5 a and 5 b the current though a sub pixel is represented by the width of a bar so that it can be seen that for the red and blue sub pixels the current for fig4 5 b is halved as compared with the configuration represented by fig3 a 5 a in fig5 a the current in each sub pixel is i the total supply voltage is 11 volts and for each of the sub pixels 4 volts i is dissipated in the thin film drive transistor v tft as indicated by dashed line 530 and similarly by dashed line 580 in fig5 b in the green sub pixel of fig5 a there is no additional wasted power but in the red sub pixel there is 4 i additional wasted power and in the blue sub pixel 3 i additional wasted power making a total of 7 i additional wasted power by contrast in fig5 b the supply voltage is 12 volts and in the blue sub pixel bar 570 there is no additional wasted power in the green sub pixel there is 1 i additional wasted power and in the red sub pixel 2 u00bdi.