Device for displaying images on its front and back surfaces

An organic electro-luminescence display device comprising:

• an optically transparent substrate;
• first pixels formed over the optically transparent substrate, the first pixels being disposed in a first direction, each of the first pixels including a first organic electro- luminescence element, a first selection switch, and a first control element, the first selection switch selecting the first pixel, the first control element controlling electrical current supplied to the first organic electro-luminescence element;
• second pixels formed over the optically transparent substrate, the second pixels being disposed in the first direction, each of the second pixels including a second organic electro-luminescence element, a second selection switch and a second control element, the second selection switch selecting the second pixel, the second control element controlling electrical current supplied to the second organic electro-luminescence element;
• and
• electrode lines disposed in the first line, each of the electrode line being interposed between the first control element and the second control element, the electrode line being commonly connected to the first organic electro-luminescence element via the first control element and the second organic electro-luminescence element via the second control element;
• wherein the first organic electro-luminescence element includes a first optically transparent and electrically conductive layer, an organic layer including a light-emitting layer, a second optically transparent and electrically conductive layer and a first optically reflective and electrically conductive layer in order,
• the organic layer configured to transform electric energy applied between the first optically transparent and electrically conductive layer and the second optically transparent and electrically conductive layer into light,
• the first optically reflective and electrically conductive layer configured to reflect light, and the first pixel configured to emit light towards a first surface of the organic electro-luminescence display device,
• the second organic electro-luminescence element is laminated with a second optically reflective and electrically conductive layer, the first optically transparent and electrically conductive layer, the organic layer including the light-emitting layer and the second optically transparent and electrically conductive layer in order, and
• the second optically reflective and electrically conductive layer configured to reflect light, and the second pixel configured to emit light towards a second surface of the organic electro-luminescence display device, the second surface being opposite to the first surface.

An organic electro-luminescence display device comprising:

• an optically transparent substrate;
• first pixels formed over the optically transparent substrate, the first pixels being disposed in a first direction, each of the first pixels including a first organic electro-luminescence element, a first selection switch, a first control element and a first capacitor, the first selection switch selecting the first pixel, the first control element controlling electrical current supplied to the first organic electro-luminescence element and the first capacitor retaining gate voltage applied to the first control element;
• second pixels formed over the optically transparent substrate, the second pixels being disposed in the first direction, each of the second pixels including a second organic electro-luminescence element, a second selection switch, a second control element, and a second capacitor, the second selection switch selecting the second pixel, the second control element controlling electrical current supplied to the second organic electro-luminescence element and the second capacitor retaining gate voltage of the second control element;
• and
• electrode lines disposed in the second line, each of the electrode line being commonly connected to the first organic electro-luminescence element via the first control element and the second organic electro-luminescence element via the second control element;
• wherein the first organic electro-luminescence element includes a first optically transparent and electrically conductive layer, an organic layer including a light-emitting layer, a second optically transparent and electrically conductive layer and a first optically reflective and electrically conductive layer in order,
• the organic layer configured to transform electric energy applied between the first optically transparent and electrically conductive layer and the second optically transparent and electrically conductive layer into light,
• the first optically reflective and electrically conductive layer configured to reflect light, and the first pixel configured to emit light towards a first surface of the organic electro-luminescence display device,
• the second organic electro-lurninescence element includes a second optically reflective and electrically conductive layer, the first optically transparent and electrically conductive layer, the organic layer including the light-emitting layer and the second optically transparent and electrically conductive layer in order, and
• the second optically reflective and electrically conductive layer configured to reflect light, and the second pixel configured to emit light towards a second surface of the organic electro-luminescence display device, the second surface being opposite to the first surface.