EP2160928A2 - Système et procédé d'enregistrement des caractéristiques de diodes électroluminescentes (led) - Google Patents

Système et procédé d'enregistrement des caractéristiques de diodes électroluminescentes (led)

Info

Publication number
EP2160928A2
EP2160928A2 EP08773553A EP08773553A EP2160928A2 EP 2160928 A2 EP2160928 A2 EP 2160928A2 EP 08773553 A EP08773553 A EP 08773553A EP 08773553 A EP08773553 A EP 08773553A EP 2160928 A2 EP2160928 A2 EP 2160928A2
Authority
EP
European Patent Office
Prior art keywords
emitting diode
light
temperature
current
voltage
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
EP08773553A
Other languages
German (de)
English (en)
Inventor
Michael Zimmermann
Eduardo Pereira
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tridonic AG
Original Assignee
TridonicAtco Schweiz AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TridonicAtco Schweiz AG filed Critical TridonicAtco Schweiz AG
Publication of EP2160928A2 publication Critical patent/EP2160928A2/fr
Ceased legal-status Critical Current

Links

Classifications

    • 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]
    • H05B45/10—Controlling the intensity of the light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/26—Testing of individual semiconductor devices
    • G01R31/2607—Circuits therefor
    • G01R31/2632—Circuits therefor for testing diodes
    • G01R31/2635—Testing light-emitting diodes, laser diodes or photodiodes
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/18—Controlling the intensity of the light using temperature feedback
    • 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]
    • H05B45/20—Controlling the colour of the light
    • H05B45/28—Controlling the colour of the light using temperature feedback

Definitions

  • LEDs Light emitting diodes
  • the invention relates generally to the field of light emitting diodes (LEDs) and more particularly to the field of detecting characteristics of a light emitting diode array.
  • LEDs light emitting diodes
  • LEDs Light-emitting diodes
  • LEDs have the advantage of a long service life, which is why they are used in different areas. For example, they are often used for emergency lighting, which are turned on automatically when a power supply to other bulbs such as gas discharge lamps fails.
  • both the light emitting diode and the associated circuit is heated by the operation.
  • the life of the individual components can be reduced or possibly overload the LED or other components arise.
  • the temporal behavior of the light-emitting diodes in operation with respect to temperature behavior, current behavior and voltage behavior is therefore of great interest.
  • the circuit for operation and control of the LEDs must be different depending on the type of light emitting diode and different
  • the invention therefore has for its object to provide a technique that allows easy operation of light emitting diode arrays.
  • the invention proposes a system for operating a light-emitting diode arrangement which has at least one light-emitting diode, comprising: detection means for the current through the light-emitting diode arrangement and the voltage drop across the light-emitting diode arrangement,
  • provisioning means may be provided which output a value representing the temperature of the light emitting diodes.
  • a system for detecting the characteristics of a light emitting diode array comprising at least one light emitting diode, wherein a control unit is adapted to operate the light emitting diode array and the diode current through and the voltage across the light emitting diodes To capture, and wherein the control unit is designed, at a first temperature of the light-emitting diode array a to detect the first current / voltage pair and a different second current / voltage pair and thereafter at least a second temperature of the LED array to detect a third current / voltage pair and a different fourth current / voltage pair.
  • the system may be configured to measure the first and second as well as the third and fourth current / voltage pair immediately after each other.
  • the system may be configured to detect further current / voltage pairs at further temperatures of the light emitting diode array.
  • the system may be configured to measure the first and second current / voltage pairs immediately after the light-emitting diode arrangement has been put into operation, so that the first temperature corresponds to the ambient temperature of the light-emitting diode arrangement.
  • the system can be designed to calculate the current temperature Tj of the light-emitting (optically active) layer ("junction") with known temperature coefficients ⁇ from the voltage values V F2 and V Fi measured at the same current flow and different temperatures
  • T 0 ambient temperature
  • a temperature sensor is provided for detecting the temperature of the light emitting diode array.
  • the system may further be adapted to the difference between two determined for different temperatures fürflußwoodsock F2 V o and V i F 0 and to calculate the temperature coefficient ⁇ from the measured temperature values Ti and T 2 from
  • the system can be designed to determine from the ascertained voltage difference ⁇ Upg of two temperatures determined for different temperatures
  • Another aspect of the invention relates to a method of detecting the characteristics of a light emitting diode array, wherein a control unit is configured to operate the light emitting diode array and detect the diode current and the voltage across the light emitting diode array, comprising the steps of Detecting a first current / voltage pair and a different second current / voltage pair at a first temperature, and detecting a third current / voltage pair and a different fourth current / voltage pair at at least one second temperature.
  • Another aspect of the invention relates to a method of detecting the characteristics of a light emitting diode array, wherein a control unit is configured to operate the light emitting diode array and detect the diode current and the voltage across the light emitting diode array, comprising the steps of Commissioning the light emitting diode array, immediately after startup detecting a first current / voltage pair and a different second current / voltage pair at ambient temperature, operating the light emitting diode array over a predetermined period of time and detecting a third current / voltage pair and a different fourth current / voltage pair at a second temperature.
  • FIG. 1 schematically shows a circuit for operating and monitoring a light-emitting diode arrangement
  • FIG. 4 shows the principle of the temperature-dependent displacement of the characteristic curve of a light-emitting diode
  • FIG. 5 schematically shows the data acquired for determining the characteristics according to the present invention
  • 6A shows another example of the temperature behavior of the characteristic curve of a light-emitting diode
  • Fig. 6B shows the temperature-dependent
  • Fig. 7 shows a first example of a
  • FIG. 8 shows a second embodiment of a circuit for operating a light emitting diode array according to the present invention
  • Fig. 9 shows schematically the steps for
  • FIG. 10 schematically shows the steps for detecting the temperature of the optically active layer according to the present invention.
  • FIG. 11 schematically shows the steps of the method for securely detecting an LED failure.
  • FIG. 1 shows a light-emitting diode arrangement 1 which, in the exemplary embodiment, has a plurality of light-emitting diodes 2 connected in series.
  • a control unit 4 controls and / or regulates the current and the voltage across the light emitting diode array 1.
  • the control unit 4 performs a constant power operation or a constant current operation.
  • the control unit 4 detects the actual current 8 by means of a measuring resistor 13 and possibly also the actual voltage 9 of the light-emitting diode arrangement 1 and evaluates it by a controller 10, which is preferably supplied with an internal or external setpoint value.
  • the controller 10 then outputs a control variable for the current and / or power control.
  • the controller 10 controls the control input 12 of a linear regulator 11 implemented as a transistor, which is connected in series with the diode path on the low-side side.
  • a linear regulator 11 implemented as a transistor, which is connected in series with the diode path on the low-side side.
  • other control variables are applicable, such as a PWM modulation.
  • the control unit 4 can be functionally connected to an internal or external memory in which at least one set of measured current and voltage values can be stored and read out for later comparison with the corresponding current values.
  • the control unit 4 may further comprise an interface 6 for connection to an external data line 7. Via the data line, which may be a bus line 7, nominal values for the power and / or the current of the Light emitting diode array 1, for example, supplied from a central office.
  • an external data line which may be a bus line 7, nominal values for the power and / or the current of the Light emitting diode array 1, for example, supplied from a central office.
  • instructions can also be supplied via this external data line 7, by means of which the execution of an error check can be instructed by the control unit 4 and / or the result of such a check can be interrogated.
  • control unit 4 can be designed to carry out the error check continuously, at intervals and / or by external commands. The result of the error check can then be shown, reported or signaled.
  • the time profile can be carried out by an evaluation unit 14 by comparing current values with, for example, stored values from the past. Alternatively, further data, for example, the time derivative of the respective parameter can be determined.
  • the present invention is not limited to a light-emitting diode arrangement 1 consisting of two light-emitting diodes 2 connected in series. Rather, the light-emitting diode arrangement 1 according to the present invention may comprise one or more light-emitting diodes 2 connected in series, alternatively also a plurality of light-emitting diodes 2 connected in parallel or else several light-emitting diode structures connected in parallel, wherein each structure may in turn comprise one or more light-emitting diodes 2 connected in series.
  • a plurality of units for detecting the actual current 8 or the actual voltage 9 can be provided for measuring the different light-emitting diode structures or the various parallel and / or series-connected light-emitting diodes 2 or light-emitting diode arrangements 1.
  • the circuit may also include one or more switches to selectively drive certain light emitting diodes or light emitting diode structures.
  • the control unit 4 is furthermore designed to control the light-emitting diode arrangement 1, individual light-emitting diodes 2 or individual light-emitting diode structures and to operate at different U / I pairs, ie. h. to operate at different values of current and / or voltage.
  • the control unit 4 according to the present invention is adapted to operate the light-emitting diode array 1, the light-emitting diodes 2 or light emitting diode structures in at least two operating modes, wherein in the first mode, the light emitting diode array is operated with a lower power or a lower current / voltage pair and in the second mode, the light emitting diode array 1 is operated at a higher power or with a higher current / voltage pair.
  • Fig. 2 shows an example of a typical characteristic curve of a light-emitting diode (LED).
  • the characteristic curve is plotted as a curve within a coordinate system in which the forward voltage Up, d. H. the tension with the LED.
  • the forward current Ip is shown, ie, the current, which through the light emitting diode 2 and the light emitting diode array 1 flows.
  • the characteristic curve of a light-emitting diode looks such that a current flow begins only from a defined flow-through voltage. Ideally, the resistance of the LED in the range greater than the forward voltage would be zero, and the current would rise steeply. In practice, the characteristic increases in the range above the flow rate with a substantially constant slope.
  • FIG. 3 With reference to FIG. 3 is explained schematically how the characteristic of a light emitting diode is described mathematically. As can be seen from FIGS. 2 and 3, the characteristic increases substantially linearly. Only just above the flow, the actual deviates from the linear course.
  • V F0 forward voltage Upg
  • the flow rate and thus the characteristic shows a thermal dependence (drift), for which a typical value is -3 mV / K.
  • a temperature drift is shown schematically in FIG. 4. More specifically, in FIG. 4, three different characteristics of a diode are shown, each characteristic corresponding to a different temperature of the diode.
  • the slope of the characteristic curves Kl to K3 is identical, only the flow rate UpQ varies.
  • the forward voltage Upn is lowest at the characteristic curve K3 and highest at the characteristic curve Kl.
  • the characteristic curve K3 in this case corresponds to the highest temperature and the characteristic class of the lowest temperature.
  • the change in the forward voltage is indicated below with ⁇ Upg.
  • FIG. 5 shows schematically the procedure for determining the characteristics of a light-emitting diode 2 or a light-emitting diode arrangement 1 according to the present invention.
  • a four-point measurement is proposed in which first a current voltage measurement takes place at low power and thus essentially at ambient temperature and then very quickly at high power.
  • Pl corresponds to the point on the characteristic line at ambient temperature, which is measured at low power.
  • the point P2 corresponds to the point on the characteristic line at ambient temperature, which is measured at high power.
  • the measurements of the points P 1 and P 2 take place in a short time interval, so that no significant heating of the light-emitting diode 2 has yet taken place.
  • the two measured points Pl and P2 which each correspond to a pair of current voltage, thus the characteristic of the LED at ambient temperature can be determined unambiguously.
  • the LED is operated for a predetermined time at high power, thereby heating. Subsequently, at this higher temperature, again at high power, a current voltage measurement is carried out and then again in a very short time interval a measurement at low power. Thus, for a second characteristic curve at a higher temperature, two measuring points can also be detected. This is schematically illustrated in FIG. 5, where point P3 corresponds to the measured high voltage, high power pair of current voltage, and point P4 corresponds to the measured high voltage, low power pair.
  • the first pair P 1 and P 2 can also be picked up at a temperature deviating from the ambient temperature. It is only important that between the temperatures of the two curves is a sufficiently large distance, so that it can be concluded from the recorded characteristics on a temperature behavior of the light emitting diode. Furthermore, it is preferably provided that the first measuring point Pl and measuring the last measuring point P4 in a first operating mode and measuring the second measuring point P2 and the third measuring point P3 in a second operating mode. This simplifies the control since only two preset operating modes have to be stored and used. Alternatively, however, it is also possible to use four different modes for measuring the points. It is only important here that the points measured within each characteristic curve are measured at sufficiently spaced powers, so that it is possible to produce the characteristic curve.
  • the present invention is not limited to the measurement of only four current / voltage pairs. Rather, it is also possible to record further measuring points at further temperatures in order to increase the accuracy of the determined characteristic curves and of the determined temperature behavior. Furthermore, it is also possible to record more than two measuring points of the characteristic straight line for each temperature.
  • the respective operating temperature is also recorded with the characteristic curves.
  • this can be assumed immediately after switching on the LED from ambient temperature.
  • the operating temperature of the chip is generally known at nominal operating current, the operating temperature can be assumed.
  • the possible deviation of the working temperature by an offset due to a different ambient temperature can be neglected for this general method without temperature measurement.
  • the temperature can also be detected by means of a sensor. This is particularly advantageous in the calibration of the light-emitting diode module; in later methods, the temperature measurement can also be dispensed with on the basis of the determined and stored characteristic curves.
  • the light emitting diode module is equipped with a thermocouple 21, which allows to raise the absolute temperature on the module.
  • the temperature sensor 21 ideally measures the temperature of the optically active layer ("junction") of the light-emitting diode in which the temperature-dependent physical processes take place.
  • both the temperature sensor 21 and the optically active layer are at the same temperature (ambient temperature). If the temperature dependence of the forward voltage of the LED is known, it is then possible to deduce the exact temperature of the optically active layer from the temperature measured, if appropriate, remotely from the optically active layer.
  • Fig. 9 shows schematically the method for determining the temperature coefficient of the light-emitting diode.
  • a first step SO the calibration command is given to the circuitry and processed by the control unit. The following steps are then carried out in each case by the control unit or the light-emitting diode controller.
  • a next step Sl the temperature T] _ of the module is detected. Subsequently, in the
  • Step S2 by means of a reference current, the forward voltage Vp ⁇ the LED detects and this Value assigned to the measured temperature reference value T ⁇ and both values stored together.
  • the light-emitting diode is operated for a certain period of time.
  • the temperature T2 which has meanwhile set in the working mode, is measured.
  • the current new forward voltage Vp2 is then determined by means of the reference current used in step S2 and stored together with the temperature T2.
  • the temperature coefficient ⁇ which indicates the temperature drift, can then be calculated as
  • the theoretical flow rate voltage V F0 for each of the characteristic curves can also be determined so that the temperature drift then results
  • V F2 o and V F i 0 are respectively the values for the forward voltage of the determined characteristic curves.
  • the two current points less accurate, ie that although the current flow must be known, but does not have to have the exact same value.
  • the characteristic straight line can also be extrapolated in order to determine the flow voltage and thus be able to dispense with the exact measurement of a reference current.
  • the temperature coefficient for each light-emitting diode is specified by the manufacturer, these values can vary for different light-emitting diodes, sizes, colors or even switching arrangements. With the proposed calibration method, it is possible to determine individually and precisely the temperature coefficient for each light-emitting diode or LED array.
  • the method according to FIG. 9 can also be applied such that after a single determination of the
  • Temperature and voltage can be closed to a fault in the light emitting diode array. That in known ⁇ so the detection of an error of
  • Light emitting diode or light emitting diode arrangement 1 allows.
  • the temperature of the LED can now, after calibration by the method of four-point measurement according to the invention, be determined during operation.
  • the method is based on the fact that by means of the reference value of the LED voltage and the measurements In operation, the difference is formed and can be deduced according to the conversion of the formula (3) to the prevailing temperature of the optically active layer ("junction") .
  • This method is shown again in FIG.
  • a first step S10 the light-emitting diode is in the switched-off state. Shortly after switching on the diode, the module temperature is detected by means of sensor 21 in a step Sil. In the following step S12, the forward voltage Vp is detected with reference current A and in the subsequent step S13 the forward voltage Vp is detected
  • the flow voltage Vpg is calculated at start temperature and these characteristics are stored.
  • Step S17 further procedures are possible, for example, a status can be set according to the DALI standard definition or a so-called emergency bit if the light-emitting diode is defective.
  • T 0 ambient temperature
  • the respective flow voltage V F10 and V F 2o can also be determined and these can then be used in the formula.
  • FIGS. 6A and 6B show different characteristics for different temperatures T] _ to T5, where T ⁇ is greater than T2, etc.
  • Fig. 6B shows the current voltage ratios in the circuit circuit, which are also temperature-dependent. The deviations from the nominal value are shown in dashed lines in FIG. 6B. If the same current flow is used at different temperatures, this may lead to variations within the circuit due to the parameter variations.
  • the proposed method since the characteristics are known, can be dispensed with a return of the LED power ratings, since it is known which current voltage ratios are present at a given current or pre-charged voltage. According to the present method, the measurements are thus based solely on the sizes of the light-emitting diode. Changes in the circuit circle can thus be bypassed as a measurement error source.
  • the present method for determining the temperature of the optically active layer is thus the reliable detection of a light-emitting diode failure especially in emergency applications possible. Furthermore, the correction of the LED driving can be varied based on the temperature, which is important because the emitted light power and the spectrum change with the temperature of the optically active layer. Furthermore, according to the present invention, only one thermal sensor 21 is necessary, which may even be in the control unit 4 depending on the turn-off time. Furthermore, no or only a minimal additional wiring is necessary because the temperature of the optically active layer can be determined separately for each channel. Furthermore, the two measurement points do not require a precise current position, only the effective current value must be known so that the working line can be calculated.
  • the present invention it is possible to determine the number of light-emitting diodes connected in series or in parallel within a light-emitting diode arrangement 1 and / or also to determine the respectively connected color groups.
  • ⁇ is the temperature change
  • ⁇ is the temperature coefficient
  • n indicates the number of LEDs in series.
  • the characteristic curve bpw determined by four-point measurement and further evaluated. This allows an operating device to perform a load detection for color determination of the connected LED (s).
  • the color of the light-emitting diode is deduced.
  • Decisive here is the temperature coefficient, which depends on the semiconductor material and from which results in the steepness of the current voltage characteristic. Depending on this characteristic, the change in the shift of the characteristic curve over the temperature is different for different LED chips. The amount of the temperature dependence of the characteristic curve can then be used for the detection of the LED chip and thus of the spectrum emitted by the LED.
  • FIGS. 7 and 8 show two examples of a corresponding circuit according to the present invention.
  • a light-emitting diode arrangement 1 is shown, which comprises three parallel series of light-emitting diodes.
  • a control unit 4 is provided, which comprises a voltage source and a central control unit 20.
  • further components 22 are provided, which may comprise a switch, a resistor or other necessary components.
  • the temperature sensor 21 is provided within the light-emitting diode arrangement 1.
  • the temperature sensor 21, as shown in Fig. 8, may be provided within the control unit 4.
  • the temperature sensor 21 supplies the measured data to the central control unit 20.
  • the temperature sensor 21 may be included directly in an integrated circuit of the control circuit 20. Alternatively, it may also be directly connected as a temperature-sensitive component such as. NTC element or diode to an IC of the control circuit 20 and be evaluated by the IC of the control circuit 20. This embodiment has the advantage that no additional wiring between control circuit 20 and temperature sensor 21 is necessary.
  • an operating device for LEDs can be automatically measured on the basis of temperature readings and electrical characteristics (current through the LED array and total voltage drop across all LEDs connected in series with at least two different currents impressed by the control unit) but without color sensor on the basis of the dynamic resistance defined above ( see equation (I)) with known dynamic resistance and known forward voltage of the individual LEDs of different color determine how many LEDs of which spectrum are connected.
  • the overall characteristic curve of the light-emitting diode arrangement is determined by at least two-point measurement and then compared, at which values for
  • the temperature dependence of the forward voltage can alternatively or additionally be determined (for example for plausibility of the above detection).
  • the number of light-emitting diodes then results from the comparison of the temperature dependence of the entire light-emitting diode arrangement with the known value of a single LED.
  • the invention makes use of the fact that the dynamic ohmic resistance LED chip is able to differentiate more clearly than the absolute value of the constant temperature flow voltage, which overlap due to the usual tolerances.
  • a distinction is made in particular between two color groups, wherein a first color group comprises the cold paints such as blue, white, green and cyan and a second color group, the warm colors such as amber, yellow and red.
  • the cold paints for example blue
  • the dynamic resistance can, for example. 1 ohm, while it may be for the warm colors such as red, for example, 2.4 ohms.
  • the present methodology describes a calibration cycle which determines the total forward voltage per channel, i. H. the forward voltage per series connected diodes, the temperature per channel, the temperature coefficient per channel, and the dynamic resistance ⁇ R per channel. Finally, these values can be used to reliably determine the connected color or color group and the LEDs per channel.
  • FIG. 11 further shows the method steps for the reliable detection of an LED failure.
  • the detection of the number and / or color or color group of the connected LEDs can be performed in particular by the control circuit 20 in the operating device.
  • the operating device can also send the information mentioned via an interface to another device, in particular a central unit (in a bus system).
  • the central unit can then react, for example, by adapting its control algorithm to the transmitted information regarding the type and / or number of connected LEDs of each operating device of the system.
  • This provision may have several advantages in the application of converters and light emitting diode modules, e.g. B. bring in the field of showcase lighting. In showcases often come two color systems for use, with z. For example, White represents the main color and Red / Amber represents the correction color in one dimension.
  • the automatic determination of the connected color allows a free choice of connections for the installer.
  • colder or warmer directions eg cold white with additional red or orange or both.
  • colder or warmer directions eg cold white with additional red or orange or both.
  • Showcase with silver Cold white are used and in a showcase with gold warm white.
  • the controller sets the amount of red on command.
  • the method according to the invention can additionally be used in combinations with a color sensor or even without a color sensor. While in the combination with a color sensor this can often help in the determination of the connected light-emitting diode color, it would not be necessary by means of the proposed method. In many applications, it is therefore possible to dispense with such a sensor by means of the proposed method.
  • the proposed method thus further complicates complicated commissioning or wiring avoided during installation. This is particularly important in the case of a sensor or light feedback with separate control units. Furthermore, standardization is simplified.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Led Devices (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

L'invention concerne un système d'enregistrement des caractéristiques d'un dispositif à diodes électroluminescentes (1) présentant au moins une diode électroluminescente (2), une unité de commande (4) étant prévue pour faire fonctionner le dispositif à diodes électroluminescentes (1) et pour enregistrer le courant diode (8) et la tension (9) au dispositif à diodes électroluminescentes (1). L'invention est caractérisée en ce que l'unité de commande (4) est configurée de manière à enregistrer, pour une première température du dispositif à diodes électroluminescentes (1), un premier couple courant/tension (P1) et un deuxième couple courant/tension (P2), différent du premier, et à enregistrer, pour au moins une deuxième température du dispositif à diodes électroluminescentes (1), un troisième couple courant/tension (P3) et un quatrième couple courant/tension (P4) différent du précédent. L'invention concerne en outre un procédé d'enregistrement des caractéristiques d'un dispositif à diodes électroluminescentes.
EP08773553A 2007-06-25 2008-06-20 Système et procédé d'enregistrement des caractéristiques de diodes électroluminescentes (led) Ceased EP2160928A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007029123A DE102007029123A1 (de) 2007-06-25 2007-06-25 System und Verfahren zur Erfassung der Kennlinien für eine Leuchtdioden-Anordnung
PCT/EP2008/005002 WO2009000475A2 (fr) 2007-06-25 2008-06-20 Système et procédé d'enregistrement des caractéristiques de diodes électroluminescentes (led)

Publications (1)

Publication Number Publication Date
EP2160928A2 true EP2160928A2 (fr) 2010-03-10

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EP08773553A Ceased EP2160928A2 (fr) 2007-06-25 2008-06-20 Système et procédé d'enregistrement des caractéristiques de diodes électroluminescentes (led)

Country Status (6)

Country Link
US (1) US8471564B2 (fr)
EP (1) EP2160928A2 (fr)
CN (1) CN101743780A (fr)
AT (1) AT516702B1 (fr)
DE (1) DE102007029123A1 (fr)
WO (1) WO2009000475A2 (fr)

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WO2009000475A3 (fr) 2009-12-10
US20120139544A1 (en) 2012-06-07
US8471564B2 (en) 2013-06-25
CN101743780A (zh) 2010-06-16
WO2009000475A2 (fr) 2008-12-31
AT516702A5 (de) 2016-08-15
DE102007029123A1 (de) 2009-01-02

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