The patent's assignee for patent number 8508136 is
News editors obtained the following quote from the background information supplied by the inventors: "From the EP 1 411 750 A2 a lighting system is known with a light emitting diode (LED) that can be plugged to a compatible driving unit. The LED comprises a resistor that is put in parallel to the LED, wherein the resistance of this resistor encodes information about the operating conditions of the LED."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "Based on this background it was an object of the present invention to provide an alternative embodiment of a lighting device, wherein it is desirable that the operation of this device is more robust and economic.
"This objective is achieved by an OLED device according to claim 1, a socket according to claim 9, and a lighting system according to claim 13. Preferred embodiments are disclosed in the dependent claims.
"According to a first aspect, the invention relates to an OLED device, i.e. a lighting device with an organic light emitting diode (OLED) as light source. The OLED device comprises a 'tag element' that encodes operating information about the OLED device (e.g. the nominal current to be supplied to the OLED), wherein the tag element shall be designed such that the operating information can be read out wirelessly and/or electrically by wire but approximately without Ohmic losses. In the latter alternative, the feature 'approximately without Ohmic losses' shall refer to the ideal situation that all electrical wires or leads would have zero Ohmic resistance. In reality, this situation can be defined by the requirement that the Ohmic losses associated to the readout of the wires amount to less than 10%, preferably less than 5%, most preferably less than 1% of the total power consumed by the OLED device. A typical example of wirelessly readable tag element would be a radiofrequency (RF) circuit. A typical example of a tag element that can be read out electrically by wire without Ohmic losses would be a capacitor on the OLED device. Further realizations of the tag element will be discussed in connection with preferred embodiments of the invention.
"In the described device, the generation of light is based on OLEDs, which are robust, versatile and power efficient light sources. The light output of OLEDs (in terms of intensity, spectral composition etc.) can be controlled by the operating parameters, for instance the current and/or the voltage they are provided with. The tag element allows to encode such parameters as operating information which can then be read out by the drivers the OLED device is coupled to and used to operate the OLED appropriately. In this way it becomes possible to produce OLED devices that have basically the same design (regarding materials, size etc.) but different light output behavior just by encoding in their tag elements different operating information.
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