EP2365734A2 - Procédé de fonctionnement d'un agencement de DEL - Google Patents

Procédé de fonctionnement d'un agencement de DEL Download PDF

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Publication number
EP2365734A2
EP2365734A2 EP11157797A EP11157797A EP2365734A2 EP 2365734 A2 EP2365734 A2 EP 2365734A2 EP 11157797 A EP11157797 A EP 11157797A EP 11157797 A EP11157797 A EP 11157797A EP 2365734 A2 EP2365734 A2 EP 2365734A2
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EP
European Patent Office
Prior art keywords
led
leds
operating
current
arrangement according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP11157797A
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German (de)
English (en)
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EP2365734A3 (fr
Inventor
Christina Obenaus
Thomas Obenaus
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Individual
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Individual
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Publication date
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Publication of EP2365734A2 publication Critical patent/EP2365734A2/fr
Publication of EP2365734A3 publication Critical patent/EP2365734A3/fr
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light

Definitions

  • the invention relates to a method for operating an LED arrangement for illumination, backlighting, irradiation or signaling, which comprises at least one light-emitting diode which is operated with switched direct current.
  • LED Light emitting diodes
  • the progressive improvement of the parameters of these components has meant that with the use of these components significant improvements in terms of energy consumption and the luminous efficacy of such arrangements and lighting units with integrated arrangements compared to the use of incandescent and fluorescent lamps as illuminants result.
  • Light-emitting diodes as a component are offered in various designs. In the classical sense, they include the pn diode with its connection pair. Increasingly, a plurality of pn-type semiconductor diodes are integrated in a compact module with housing, wherein the diodes of the module have either a common or a number of separate terminal pairs.
  • the LEDs contemplated herein include various configurations including one or more pn-type semiconductor diodes, but only one pair of terminals. However, it remains unavoidable to group together several such LEDs, ie to connect them in parallel or in series, so that they work like an LED. Similarly, it is incidental whether and in what way the LED is housed.
  • the operating power of such LEDs is mainly provided by power supplies which convert the mains voltage to a DC voltage conducive to LEDs, or other DC power sources, e.g. Batteries.
  • LEDs are current controlled devices, they must be operated via a current limiting element, a power source, to avoid destruction by excessive current in the event of too low internal resistance of the power supply or battery.
  • resistors or power sources based on semiconductors are used.
  • circuits which include a series and / or parallel connection of the LEDs. Dimming the arrangement is possible by means of control by means of pulse width modulation, the dimming being understood as the modification of the illumination intensity of the LED by changing the pulse / pause ratio of the voltage pulses or their chronological sequence.
  • the manufacturers usually specify the operating parameters for two different modes of operation, the continuous current for the operating current and for pulse mode the pulse operating current, which is slightly higher than the operating current.
  • the duty cycle ie the ratio of the widths of the two voltage states changing in one cycle
  • a constant clock frequency so that linearly stepless brightness values can be set.
  • a flicker is avoided by setting such a fundamental frequency at which the human eye no longer perceives the individual switching states.
  • This technique is used in particular for the backlighting of displays, eg in mobile phones or cockpit displays, in which a high illuminance is not required and not desired.
  • the LED is driven by voltage pulses, whereby the pulses are modified in particular in their chronological sequence in order to vary the illuminance of the LED.
  • This is done, for example, by means of a pulse width control for generating pulse trains with at least 100 Hz, which allows the individual emitted from the LED light pulses are not perceived as individual flashes, but as a uniform light.
  • the value of the illuminance also includes the brightness sensitivity of the human eye and thus represents not only a photometric but also a physiological size. The illuminance is thus also a measure of the perceived by humans brightness of the arrangement.
  • illuminance is a key factor in lighting technology and is used as a verification criterion in the computer-aided planning of indoor and outdoor lighting systems.
  • This check of whether a luminaire or a luminaire also reaches the planned values in a specific environment is measured by means of a lux meter.
  • Lux meters contain optical and electronic filters as well as components which suppress the change of the measured values in short time intervals in order to obtain stable measured values, which can also be displayed and also read. Such filters are used for. B. to adjust the detection range of the Luxmeters on certain light sources or only to hide certain frequency ranges of sunlight. Other filters are for certain color temperature ranges used or even to simulate the sensitivity of the human eye for certain spectral colors.
  • the luminous flux describes the amount of light emitted by a light source in a spherical space surrounding the light source as a whole without consideration of the emission angle.
  • the beam angle has an influence on the surface.
  • the luminous flux in lumens is specified by the LED manufacturers in the data sheet.
  • LEDs that contain a plurality of LED chips with different luminous color in a housing, it is also possible, with appropriate individual control of these chips, the resulting mixed luminous color of the LEDs to adapt to the requirements.
  • the invention is therefore based on the object to provide a method for operating an LED array for lighting and also for backlighting, irradiation and signaling or other comparable applications available, which allows a reduction in power consumption of the LED array with undiminished brightness as possible.
  • a method for operating an LED arrangement in which the LEDs of the LED arrangement, via a switching element associated with each LED, have a current source which serves to supply each LED with the constant current predetermined for it during a switch-on state connected and disconnected during a subsequent off state.
  • a clock frequency of an on and off state is set greater than 100 Hz, wherein in the case of two or more LEDs in the LED array whose switching elements are controlled by a control circuit with a uniform clock frequency of an on and off state greater than 100 Hz such in that only a part of the LEDs is always switched on and other LEDs are switched on in two successive switch-on states.
  • such a clock frequency of an A is by means of a control circuit - and off state greater than 100 Hz set that the illuminance in the clocked operation of that in the untimed operation, ie in continuous operation with the predetermined for the LED characteristic operating current, with the predetermined for the LED characteristic operating current by at most 5% deviates.
  • the deviation should be at most 2%, most preferably at most 1%.
  • an LED array with one or more LEDs with the method according to the invention applicable for different purposes achieves in particular an increase in energy efficiency, lifetime and reliability of the LED array with the same or at least almost the same perceived illuminance compared to the continuous operation of a same Number of LEDs of the same type and with the same operating parameters.
  • the perceived Illuminance of the LED array of the invention corresponds to a conventional LED array in continuous operation, the energy efficiency is significantly increased as set out below.
  • the individual LEDs or LED groups of the LED arrangement are only in the on state for a short time, so that, in addition, a longer service life of the individual LEDs results. Because as you know, the life of an LED depends on the time in which it is in operation. The theoretical life of the LED array thus results from the multiplication of the lifetime of the individual LEDs, depending on the number of simultaneously operated LEDs.
  • Another effect of the method according to the invention is the increase in the reliability of the LED arrangement. Since each LED or possibly each LED group are operated via a separate switching element, the LED arrangement continues to operate in the event of a failure of only one LED. A short over The failed LED, which can also lead to a failure of the power source is prevented by the regular shutdown of the defective LED by the switching element.
  • the assignment of switching elements to the individual LEDs improves the reliability of the LED array. Failures of LEDs, switching elements or circuit parts of the LED array lead due to their lack in the course of the clock only to a more or less noticeable reduction in the illuminance, not the total failure of the LED assembly. A failure of the LED array occurs only if the power source or the control circuit fails. In order to ensure the reliability even with multiple errors, ie the simultaneous failure of an LED and its associated switching element, such higher reliability components can be used or constructed redundantly, which serve the power supply or as a flow control of the LEDs via the switching elements.
  • Reliability also affects the heat balance of the LED array.
  • the inventive type of driving of the LEDs and the resulting operation with the parameters specified by the LED manufacturer results in a very low heating of the arrangement, since the lower self-heating can be dissipated in any case to the environment.
  • the reduced temperature load also reduces aging processes and a concomitant lowering of the light output of the LEDs.
  • the method according to the invention is suitable for LED arrangements in various applications. It allows, for example, to illuminate the environment for people in closed and open, eg street spaces, so that an increase in the luminous efficacy as a ratio of the luminous flux received by the LED array electrical power, in particular as a result Reduction of power consumption is possible. Due to the significantly lower energy requirement of the LED arrangement resulting from the constantly recurring switch-off states, a significantly higher light yield results, and this at almost the same illuminance compared to the prior art.
  • the luminous efficacy of a light source is the ratio of the luminous flux to the recorded electrical power (1m / W). It is a measure of the energy efficiency of the light source.
  • the one or more LEDs of the LED array are operated discontinuously, whereby the conditions of the human eye and the brain are exploited with regard to the perceived illuminance, in order to increase the luminous efficacy and, associated therewith, the energy efficiency, in order to reduce this To achieve power consumption through the LED arrangement.
  • the human eye is sluggish in its perception of brightness differences. This means that brightness differences are no longer perceived when they occur with a correspondingly high repetition frequency.
  • abrupt transitions between off and on state in the eye produce a significantly higher brightness impression. The latter is known as the flash effect. If the clocked operation with steep pulse edges, such as in flash applications, the brightness impression can be increased by the abrupt brightness changes.
  • the LEDs provide light sources that allow such operation due to their ability to be quickly turned on and off.
  • the lower limit of the frequency range of about 100 Hz is the one from which the human eye the discontinuous operation no longer perceives as such, ie no flicker is detected.
  • the light flash effect can be used to increase the brightness impression.
  • the upper limit of the frequency range is given by the avoidance of electromagnetic interference by alternating fields, known as EMC.
  • Limits in the execution of this mode of operation of the LED array with regard to the maximum number of LEDs to be controlled are, inter alia, the dissipation of the heat loss of the respective LED array and the switching times of the LEDs used and other components of the LED array.
  • the LED arrangement can also be operated with pulse operating current.
  • an operating current which is higher than the characteristic continuous operating current specified by the manufacturer can be fed in via the current source. Therefore, for example, the pulse current guaranteed by the manufacturer can be used for this embodiment variant.
  • the prerequisite for this is that the dynamic power loss of the LEDs and other components is not exceeded.
  • Dynamic power dissipation includes, for example, the on-off ratio and the environmental parameters as well as the parameters of the component housing used with regard to the thermal behavior.
  • This mode of operation leads to a further increase in the brightness due to the higher operating current and also to a brighter flash of light when switching on, whereby the above-described physiological flash effect is enhanced and a higher light output can be achieved.
  • the manufacturers usually specify the operating parameters for two different modes of operation, the operating current for continuous operation and the pulse operating current for pulsed operation, which is slightly higher than the operating current. That
  • the operating parameters specified by the manufacturer of LEDs, in particular the operating current, are specified for pulse operation and continuous operation.
  • the life of an LED depends due to the depletion of the semiconductor material, the aging of the diode chip and the phosphor white LEDs, as well as due to material migration processes in the LED structure, significantly on the duty cycle of the LED, the amount of operating currents and thus indicated heating of the semiconductor material as well as the environmental conditions during operation, both mainly determines the operating temperature.
  • the method of the present invention which is applicable to both intermittent and pulsed operation of an LED, has a positive effect on the life expectancy of the LEDs of the LED array.
  • the reduced duty cycle of the light source in the operation of the invention leads to a lower heating of the LED.
  • the heat can be released in the off states to the environment. With good heat dissipation can therefore also be used with an increased operating current and thus with improved utilization of the effects mentioned with a higher light output.
  • a white LED comparable but also a colored LED, by utilizing the additive color mixture and using at least one colored or UV LED in conjunction with a photoluminescent material as a phosphor, usually phosphor realized.
  • the afterglow duration and the decay behavior of the excited phosphor also play a role in the brightness impression of the LED arrangement.
  • LEDs with phosphorescent phosphors e.g. With persistence times of 10 to 20 ms, this effect can be even more pronounced compared to the usual persistence times of currently 1 to 2 ms.
  • LEDs are current controlled devices, they must be powered by a power source to avoid destruction by excessive current flow, such as may occur with a voltage source such as by reducing the internal resistance of the power supply or battery.
  • the implementation of the clocked operation according to the invention is carried out with a switching element, which is associated with the LED and by short switching times with a control steep pulse edges allowed. This can on the one hand realized a high clock frequency and on the other hand, the switching losses are kept low.
  • the LED arrangement in one embodiment comprises a control unit which adapts internal parameters to external parameters or vice versa.
  • integrated brightness sensors may enable or disable the LED array depending on the ambient brightness and reduce the operating current provided by the power source.
  • the described method initially serves for an LED arrangement in normal operation, it also allows the combination with the dimming of the LED arrangement by means of the control unit in accordance with a method embodiment.
  • the power source for the LEDs is controlled so that the removable current is changed and the brightness of the LEDs is reduced.
  • the pulse width modulation or the reduction of the clock frequency can be used for dimming.
  • a motion detector or presence detector can be integrated, which causes an automatic shutdown of an unneeded LED arrangement when no person is in the immediate vicinity or a reduction in the brightness in the event that the LED assembly is integrated into an emergency lighting system , which is operated by means of a backup battery.
  • a system for temperature ie setting a preferred temperature by water cooling, ventilation or possibly also heating can be activated.
  • an increase in the LED temperature causes a reduction in the luminous efficacy, if the lower guaranteed operating temperature of the components is not undershot becomes.
  • the LEDs can be influenced as light sources of the LED arrangement via this control unit.
  • the control unit may include a radio interface for on / off operation or continuous control of the LEDs with regard to brightness or switching times or other additional functionalities.
  • a programming of the power source with respect to the parameters of the individual LEDs to be controlled so that a reduction in the depth of selection of the LEDs used in the manufacturer of the LEDs is possible without sacrificing the functionality of the LED array, in particular the uniform light emission from the LED Having to accept the order.
  • the embodiment of the control of the LEDs of Fig. 1 to Fig. 3 represent only exemplary solutions that differ in their complexity of the respective LED arrangement with regard to the number of controllable LEDs and the integrable control or additional functionalities. All are based on the same operating principle that a certain number of LEDs are powered by a power source configured to provide the manufacturer-specific operating current for the type of LED being used, depending on the application, or one corresponding to the application.
  • LED arrays are known to be operated with a voltage in the low voltage range, according to their characteristic diode characteristics and the manufacturer's specifications in the range of a few volts DC. It follows that the usual mains voltage of eg 110 V or 230 V AC must be converted to the voltage required for the LED arrangement. Suitable for this purpose Methods and devices are well known and are not the subject of the invention.
  • the LED arrangement according to the block diagram in Fig. 1 includes several LEDs I, which are connected in parallel in the illustrated embodiment via the switching elements E, together with the necessary complementary and not shown in the block diagram components, the three points between the last two LEDs I indicate that more than the LEDs shown I can be included in the circuit.
  • an LED group I consisting of a plurality of LEDs I connected in series and / or in parallel can also be used, so that a switching element E is assigned to one LED group I each.
  • an LED symbol would alternatively also be able to stand for a plurality of LEDs I connected in series and / or in parallel, so that the same reference number is assigned to an LED group I as well.
  • LEDs I are current-controlled components, they are operated via a current source D, which is connected to a suitable power supply A.
  • the power supply A serves to supply all the components of the LED array.
  • the power source D supplies a constant current, which is set for each LED I according to the manufacturer's specifications and the application.
  • current sources D are semiconductor-based or, in the simplest case, series resistors are connected in series Voltage source used.
  • Each LED I is assigned a switching element E, which supports short switching times and a quick change of switching states.
  • electronic switching elements e.g. fast thyristors, transistors or MOSFETs.
  • the switching elements are controlled so that in the simplest case only one LED I is in the ON state and with the subsequent switching operation, this LED I off and another LED I is turned on.
  • several of the LEDs I can be switched on at the same time, these being switched off in the subsequent switching operation and other LEDs I being switched on.
  • a control circuit F which can be realized in various ways, e.g. by means of a shift register or a runtime generator.
  • a shift register which may be formed in the simplest case as a flip-flop, both the off state for only one LED I and any combination of several LEDs I can be realized.
  • the currently activated LED I changes so that, consecutively or in any order, each of the LEDs I was switched on and the remaining time is switched off.
  • a shift register and incidentally, a runtime generator is easy and inexpensive to implement.
  • a clock generator G as a clock whose clock frequency is chosen so high that, depending on the number of successively switched LEDs I no flicker of the LED array as a whole results and the illuminance, as with the wavelength-dependent Hell.keitsfunktion of the human eye and with the spectral radiant flux evaluated at the maximum of the photometric radiation equivalent, does not fall below a value which corresponds almost to the illuminance of this LED array in the non-pulsed mode.
  • the LED device further comprises a control unit B which adapts internal parameters to external parameters, e.g. the ambient brightness via the activation or deactivation of the LED array or the reduction of the operating current, which is provided by the power source D.
  • a control unit B which adapts internal parameters to external parameters, e.g. the ambient brightness via the activation or deactivation of the LED array or the reduction of the operating current, which is provided by the power source D.
  • a programming of the current source D with respect to the parameters of the individual LEDs to be controlled I take place.
  • Other functionalities, such as motion detectors or presence detectors or systems for controlling the temperature of the LED array can also be integrated.
  • control unit B it is possible via the control unit B to influence the LEDs I as light sources of the LED arrangement.
  • control unit B may comprise a radio interface for the on / off operation or the continuous control of the LEDs I with regard to brightness or switching times or other additional functionalities.
  • a combination of the method according to the invention with the known pulse width modulation of the clock generator G for dimming the LED arrangement is possible via the control unit B.
  • parameters for operating the LED array that do not directly relate to the LEDs I and their arrangement with one another and are referred to herein as external parameters may be determined by the internal, i.e., the external, parameters. be influenced by the LEDs I parameters determined by the control unit B.
  • the control unit B e.g. a programming of the current source D with respect to the parameters of the individual LEDs to be controlled I done.
  • Fig. 2 an alternative embodiment is shown, in which the operation of an LED array is shown, which comprises a large number of LEDs I.
  • a plurality of LEDs I connected in parallel, each having a switching element E are combined into a block and the blocks are comparable to the individual LEDs I in the exemplary embodiment Fig. 1 by means of the control circuit F, also a shift register controlled.
  • a decoder K is interposed for each block. This converts the switching signal of the register position of the shift register F assigned to the respective decoder K into individual signals for each switching element E of the block.
  • Fig. 3 shows a single control of the LEDs I by means of microcontroller H.
  • the microcontroller H takes over various functions, such as the functions of the clock generator G, the decoder K, and other important for the operation tasks, such as the control of a bus decoder and / or the individual setting of the power source D corresponding to the respective individual LEDs I or group of LEDs I. Also, a variation of the operating current of individual LEDs within the manufacturer parameters is possible.
  • the individual switching elements E or a large number of LEDs I via bus decoder L can be controlled separately, so that any change of the on and off states between the individual LEDs I, but with the characteristic for the LED array clock frequency can be done and this parameter as well as others can also be stored and varied.
  • microcontroller By means of microcontroller but also with other embodiments of the control circuit can according to an embodiment of the method on their operating current and / or the number of their turn-on states are controlled such that when using LEDs of different colors in the LED array and driving the corresponding color LEDs, a defined mixed color is set.
  • a mixed color By way of the different number of switch-on states of the different LEDs, ie their number of clock cycles in which the individual LEDs are switched on, in comparison with one another, a mixed color can be selectively adjusted by measurement or calculation. Additionally or alternatively, the brightness of the individual LEDs and thus their proportion of the mixed color over the operating current are still variable, so that as a result, the resulting mixed color special requirements (eg high daylight similarity according to CRI color rendering index) is customizable.
  • the programmability of the drive in this embodiment of the method also makes it possible that a main LED array can be extended by using the bus decoder L with spatially separated remote sub-assemblies. These are then operated as an extension of the shift register in the main LED array and further improve the energy efficiency of the device.
  • certain types of failures in the LED array can also be detected, e.g. B. increasing the current flow in a branch of the arrangement, which consists of LED I and switching element E and it can, if present, redundant branches of the LED array take over their function.
  • Fig. 4 is a simple design of the control circuit F in the form of a shift register and its connection with the LEDs I via the switching elements E and the power source D and the clock generator G shown. Other components of the LED arrangement are for better clarity because of Fig. 4 not shown.
  • the shift register F is made up of the individual, in Fig. 4 separately represented register locations SR1, SR2, etc. to SRN together, where n is the number of parallel to be controlled in succession LEDs I.
  • the output of each register location SR1, SR2... SRN is connected to a switching element E, eg a MOS-FET, which switches the respectively assigned LED I on and off.
  • the LEDs I are supplied with the respective constant current specified by the manufacturer.
  • the timing of the switching operations is performed by a suitable clock generator G.
  • the individual register locations are connected in series and their outputs are decoded such that the signal of a register location SR1, SR2... SRN, which implements the on or off state for the associated LED I, is applied to each clock moves the adjacent register location SR1, SR2 ... SRN in one direction.
  • the embodiment according to Fig. 4 provides the possibility of measuring the output signal of each switching element E at the measuring points A1, A2, ... An, which is the input signal of the associated LED I.
  • Fig. 5 sets the resulting waveform according to the supply voltage U as a function of time at different points of the circuit according to Fig. 4
  • the signal course U G (t) indicates the clocking superordinate from the clock generator G with a constant signal duration for the on state t i and a very short off state t p of about 1-2% of t i and continuous change of this state, during the signal duration of the switch-off state tp always switch off all the switching elements E the LEDs I and the transition from one LED to the next takes place.
  • the register locations SR1, SR2... SRN of the memory register are assigned such that at a defined time a first LED I is connected to the current source D and all other LEDs I are separated, as shown by way of example in the signal curves U SR1 (t), U SR2 (t) and U SR3 (t) and confirmed at the associated measuring points A1, A2 and A3.
  • the switching state of the first register location SR1 is transferred to the next register location SR2 and the content of the register location SR1 is set to zero.
  • exactly one LED I is always switched on alternately and all others are switched off, then another is switched on and all the others are switched off again. This process is repeated continuously until each of the LEDs I was turned on once and the process starts again.
  • Fig. 6 provides a waveform analogous to that in Fig. 5 but applied to the pulsed operation of the LEDs I of the LED array. Accordingly, the LED array is fed with a pulse operating current specified by the LED manufacturer that is higher than the operating current (in Fig. 6 not shown).
  • the ratio of the on and off state of the higher clock of the clock generator G is also set with a constant signal duration for the on state t i and the off state t p , in which case the on state t i is significantly shorter than the off state t p .
  • the higher clock of the clock generator is adapted to the requirements of the pulse mode (not shown). Accordingly, the illustrated waveform U G (t) and the other signal waveforms shown. From these, in turn, the switching states, as above to Fig. 5 described, but with shorter switching times.
  • Fig. 5 and 6 It can be seen that the individual LEDs I are operated only with very short turn-on, followed by long turn-off states, which serve for recovery of the components involved and also for heat dissipation, It can be seen that the length of these turn-off states directly with the number of in the Arrangement used LEDs I related. Ie. in an LED arrangement with six LEDs I and a switched-on LED I, each of the LEDs I is only switched on again after all the remaining five LEDs I have also passed through their on and off states.

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EP11157797A 2010-03-11 2011-03-11 Procédé de fonctionnement d'un agencement de DEL Ceased EP2365734A3 (fr)

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FR3020122A1 (fr) * 2014-04-22 2015-10-23 Renault Sas Procede de pilotage d'un feu de signalisation ou d'eclairage a diodes electroluminescentes pour vehicule automobile
IT202000023632A1 (it) 2020-10-07 2022-04-07 Zaglio S R L Unità e metodo di alimentazione per dispositivi di illuminazione a led
EP4243008A3 (fr) * 2018-08-10 2023-09-27 InnoLux Corporation Dispositif électronique

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3020122A1 (fr) * 2014-04-22 2015-10-23 Renault Sas Procede de pilotage d'un feu de signalisation ou d'eclairage a diodes electroluminescentes pour vehicule automobile
EP4243008A3 (fr) * 2018-08-10 2023-09-27 InnoLux Corporation Dispositif électronique
US11798922B2 (en) 2018-08-10 2023-10-24 Innolux Corporation Electronic device with passivation layer covering a plurality of light emitting units and increased lighting efficiency
IT202000023632A1 (it) 2020-10-07 2022-04-07 Zaglio S R L Unità e metodo di alimentazione per dispositivi di illuminazione a led

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