Patent ID: 8357928
Filing Date: 2013-01-22
Classification: H01L

Abstract:
1. Light emitting diode comprising, on a substrate, at least one organic light emitting layer placed between a lower conducting layer and an upper conducting layer, without any further conducting layer between said lower conducting layer and said upper conducting layer, wherein at least one of said upper and lower conducting layers presents a suitable surface resistance distribution so that when a supply voltage is applied between an at least one “lower” connection element connected to said lower conducting layer and an at least one “upper” connection element connected to said upper conducting layer, a distribution of potential is generated on the surface of the at least one of said upper and lower conducting layers that is capable of provoking a light emission by a surface portion of the at least one organic light emitting layer which is proportional to the said power supply voltage, such that said surface portion provides a visual representation of the value of said power supply voltage, provided that the said power supply voltage is between a given range of values, [U th , U ceil ], called the operating range, wherein the distribution of the emission colours over said surface portion of the at least one organic light emitting layer which emits light varies according to said potential distribution on the surface of said at least one of said upper and lower conducting layers such that said distribution of the emission colours depends on said power supply voltage in order to complement the visual representation of the value of said power supply voltage.