An organic electroluminescence (EL) device is provided, including a transparent substrate and an array of pixels over the transparent substrate. Each of the pixels includes at least one first sub-pixel and at least one second sub-pixel, wherein the at least one first sub-pixel each includes a first organic light emitting diode for providing light in a first direction, and the second sub-pixel each includes a second organic light emitting diode for providing light in a second direction substantially opposite to the first direction.