Patterned electrodes on porous substrates, where the contacts to address these electrodes are hidden on the back of the substrates are described. To demonstrate the applicability of this method in fabricating organic electronic devices, a reflective-type polymer electrochromic device is constructed. A 7-pixel numerical-display device, showing the number "6" in the Figure, benefits from the color contrast between gold and a poly(3,4-propylenedioxythiophene) derivative.