(19)
(11)EP 3 220 719 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
06.05.2020 Bulletin 2020/19

(21)Application number: 17161612.1

(22)Date of filing:  17.03.2017
(51)Int. Cl.: 
H05B 47/29  (2020.01)

(54)

LIGHT EMITTING ELEMENT DRIVING DEVICE, LIGHT EMITTING DEVICE, AND VEHICLE

ANSTEUERUNGSVORRICHTUNG FÜR LICHTEMITTIERENDES ELEMENT, LICHTEMITTIERENDE VORRICHTUNG UND FAHRZEUG

DISPOSITIF DE COMMANDE D'ÉLÉMENT ÉLECTROLUMINESCENT, DISPOSITIF ÉLECTROLUMINESCENT ET VÉHICULE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 18.03.2016 JP 2016055482

(43)Date of publication of application:
20.09.2017 Bulletin 2017/38

(73)Proprietor: Rohm Co., Ltd.
Kyoto-shi, Kyoto 615-8585 (JP)

(72)Inventor:
  • NAKAYAMA, Masaaki
    Kyoto, 615-8585 (JP)

(74)Representative: Isarpatent 
Patent- und Rechtsanwälte Behnisch Barth Charles Hassa Peckmann & Partner mbB Friedrichstrasse 31
80801 München
80801 München (DE)


(56)References cited: : 
DE-A1-102004 038 425
US-A- 5 216 328
US-A- 4 961 028
US-A1- 2004 212 310
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    CROSS-REFERENCE TO RELATED APPLICATIONS



    [0001] This nonprovisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No. 2016-055482 filed in Japan on March 18, 2016.

    BACKGROUND OF THE INVENTION


    Field of the Invention



    [0002] The present invention relates to a light emitting element driving device arranged to drive a light emitting element, and a light emitting device and a vehicle using the light emitting element driving device.

    Description of Related Art



    [0003] Fig. 9A is a diagram illustrating a general structural example of a light emitting device including a tail lamp and a stop lamp mounted in the vehicle. The light emitting device illustrated in Fig. 9A includes switches SW1 and SW2, diodes D1 to D3, driving circuits 1 and 2, at least one light emitting element (light emitting diode in Fig. 9A) Z1, and at least one light emitting element (light emitting diode in Fig. 9A) Z2. The light emitting element Z1 is a stop lamp, and the light emitting element Z2 is a tail and stop lamp.

    [0004] In a tail mode in which the tail lamp is lighted, the switch SW2 becomes ON state so that an input voltage VIN is supplied to the driving circuit 2 via the switch SW2 and the diode D3. Thus, the driving circuit 2 drives the light emitting element Z2, and the light emitting element Z2 is lighted as illustrated in Fig. 9B.

    [0005] In a stop mode in which the stop lamp is lighted, the switch SW1 becomes ON state so that the input voltage VIN is supplied to the driving circuit 1 via the switch SW1 and the diode D1 and also is supplied to the driving circuit 2 via the switch SW1 and the diode D2. Thus, the driving circuit 1 drives the light emitting element Z1 while the driving circuit 2 drives the light emitting element Z2, and hence the light emitting elements Z1 and Z2 are lighted as illustrated in Fig. 9C.

    [0006] Here, it is supposed that an abnormality occurs in the light emitting element Z2, and hence the light emitting element Z2 is not lighted at all when the driving circuit 2 supplies power to the light emitting element Z2. In this case, the light emitting element Z1 is lighted in the stop mode as illustrated in Fig. 9D, while none of the light emitting elements Z1 and Z2 is lighted in the tail mode as illustrated in Fig. 9E.

    [0007] The tail lamp is used for informing a driver of a following vehicle that there is a preceding vehicle at night or in a bad weather such as thick fog or snowstorm. Therefore, if none of lamps positioned on the rear of the vehicle is lighted in the tail mode, it is a safety problem.

    [0008] Therefore, for example, the driving circuit 2 and the light emitting element Z2 illustrated in Fig. 9A are divided into two redundant circuits of the tail and stop lamps, which include a set of a driving circuit 2A and a light emitting element Z2A, and a set of a driving circuit 2B and a light emitting element Z2B, as illustrated in Fig. 10. Thus, it is possible to avoid that none of lamps positioned on the rear of the vehicle is lighted in the tail mode. However, the structure illustrated in Fig. 10 includes more components than the structure illustrated in Fig. 9A, and hence has a problem that power consumption and cost are increased.

    [0009] Further, JP-A-2004-34741 proposes a tale/stop lamp having a structure in which each of the tail lamp and the stop lamp is constituted of a plurality of circuits of LEDs so that each of the tail lamp and the stop lamp has redundancy, so as to elongate life of the LEDs by periodic lighting and to light only an unbroken LED when detecting breaking of an LED. Because each of the tail lamp and the stop lamp has redundancy in the tale/stop lamp proposed in JP-A-2004-34741, the structure has a problem that power consumption and cost are increased, similarly to the structure illustrated in Fig. 10, as it requires more components than the structure illustrated in Fig. 9A.
    US 5 216 328 A discloses a vehicle lighting system comprising a lighting circuit designed to illuminate a back-up lighting element when a primary lighting element fails. Both lighting elements may be installed in a single housing, such as a headlight assembly. A low-resistance coil is series connected with the primary lighting element. If the primary element fails, the absence of current through the low-resistance coil triggers a switching element to close a mechanical switch and thus to illuminate the back-up element.
    Furthermore, US 2004/0212310 A1 describes a vehicular lamp with a plurality of semiconductor light emitting devices connected in parallel. When a wire of one of the plurality of semiconductor light emitting devices is broken, a current control unit increases an electric current to be supplied to at least one other of the plurality of semiconductor light emitting devices.

    SUMMARY OF THE INVENTION



    [0010] The present invention provides a light emitting element driving device with the features of claim 1, a light emitting device with the features of claim 12 and a vehicle with the features of claim 16.

    [0011] Meanings and effects of the present invention will become more apparent from the description of the embodiment given below. However, the embodiment described below is merely an example of the present invention. Meanings of the present invention and terms of elements should not be limited to those described below in the embodiment.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0012] 

    Fig. 1A is a diagram illustrating a first structural example of a light emitting device.

    Fig. 1B is a diagram illustrating a lighting state in a tail mode of the light emitting device illustrated in Fig. 1A when an abnormality occurs in a tail and stop lamp.

    Fig. 2 is a diagram illustrating a structural example of an abnormality detection circuit.

    Fig. 3 is a diagram illustrating a second structural example of the light emitting device.

    Fig. 4 is a diagram illustrating a third structural example of the light emitting device.

    Fig. 5 is a diagram illustrating a fourth structural example of the light emitting device.

    Fig. 6 is an external view (front) of a vehicle in which the light emitting device is mounted.

    Fig. 7 is an external view (rear) of the vehicle in which the light emitting device is mounted.

    Fig. 8 is an external view of an LED rear lamp module.

    Fig. 9A is a diagram illustrating a general structural example of a light emitting device including a tail lamp and a stop lamp.

    Fig. 9B is a diagram illustrating a lighting state in a tail mode of the light emitting device illustrated in Fig. 9A.

    Fig. 9C is a diagram illustrating a lighting state in a stop mode of the light emitting device illustrated in Fig. 9A.

    Fig. 9D is a diagram illustrating a lighting state in the stop mode of the light emitting device illustrated in Fig. 9A when an abnormality occurs in the tail and stop lamp.

    Fig. 9E is a diagram illustrating a lighting state in the tail mode of the light emitting device illustrated in Fig. 9A when an abnormality occurs in the tail and stop lamp.

    Fig. 10 is a diagram illustrating a structural example of a light emitting device with redundancy of the tail and stop lamp.


    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS


    <First structural example>



    [0013] Fig. 1A is a diagram illustrating a first structural example of a light emitting device. Note that, in Fig. 1A, the same part as in Fig. 9A is denoted by the same numeral or symbol. The light emitting device illustrated in Fig. 1A includes switches SW1 and SW2, diodes D1 to D3, driving circuits 1 and 12, at least one light emitting element (light emitting diode in Fig. 1A) Z1, and at least one light emitting element (light emitting diode in Fig. 1A) Z2.

    [0014] The driving circuit 1 is, for example, a series regulator arranged to supply constant current to the light emitting element connected to an output terminal T12, a switching regulator arranged to supply predetermined on-duty pulse width modulation (PWM) current to the light emitting element connected to the output terminal T12, or the like. Similarly, the driving circuit 12 is, for example, a series regulator arranged to supply constant current to the light emitting element connected to an output terminal T22, a switching regulator arranged to supply predetermined on-duty PWM current to the light emitting element connected to the output terminal T22, or the like.

    [0015] An input voltage VIN is applied to one end of each of the switches SW1 and SW2. The other end of the switch SW1 is connected to an input terminal T11 of the driving circuit 1 via a reverse current blocking diode D1 and is connected to an input terminal T21 of the driving circuit 12 via a reverse current blocking diode D2. The other end of the switch SW2 is connected to the input terminal T21 of the driving circuit 12 via a reverse current blocking diode D3. The switches SW1 and SW2 and the diodes D1 to D3 function as a control portion arranged to control supply of input power to the driving circuits 1 and 12.

    [0016] The switch SW1 becomes ON state in a first mode (for example a stop mode). Therefore, in the first mode, the input voltage VIN is supplied to the input terminal T11 of the driving circuit 1 and the input terminal T21 of the driving circuit 12, and hence the driving circuit 1 can supply power to the light emitting element connected to the output terminal T12, while the driving circuit 12 can supply power to the light emitting element connected to the output terminal T22.

    [0017] The switch SW1 becomes OFF state in a mode other than the first mode. Therefore, in a mode other than the first mode, the input voltage VIN is not supplied to the input terminal T11 of the driving circuit 1, and hence the driving circuit 1 cannot supply power to the light emitting element connected to the output terminal T12.

    [0018] The switch SW2 becomes ON state in a second mode (for example a tail mode). Therefore, in the second mode, the input voltage VIN is supplied to the input terminal T21 of the driving circuit 12, and hence the driving circuit 12 can supply power to the light emitting element connected to the output terminal T22. Note that it is no problem if there is a state in which the first mode and the second mode are simultaneously active.

    [0019] The switch SW2 becomes OFF state in a mode other than the second mode. Therefore, in a mode other than the first mode or the second mode, the input voltage VIN is not supplied to the input terminal T21 of the driving circuit 12, and hence the driving circuit 12 cannot supply power to the light emitting element connected to the output terminal T22.

    [0020] The light emitting element Z1 is normally connected to the output terminal T12 of the driving circuit 1, and the light emitting element Z2 is normally connected to the output terminal T22 of the driving circuit 12.

    [0021] A bypass path 3 connects the output terminal T12 of the driving circuit 1 to the output terminal T22 of the driving circuit 12. A switch SW3 is disposed in the bypass path 3. Therefore, when the switch SW3 is ON state, the bypass path 3 becomes a conductive state. Thus, the output terminal T12 of the driving circuit 1 is connected to the light emitting element Z2, and the output terminal T22 of the driving circuit 12 is connected to the light emitting element Z1. On the other hand, when the switch SW3 is OFF state, the bypass path 3 becomes a cutoff state. Thus, the output terminal T12 of the driving circuit 1 is not connected to the light emitting element Z2, and the output terminal T22 of the driving circuit 12 is not connected to the light emitting element Z1.

    [0022] The driving circuit 12 includes an abnormality detection circuit arranged to detect an abnormality of the light emitting element Z2. A structural example of the abnormality detection circuit included in the driving circuit 12 is illustrated in Fig. 2. The abnormality detection circuit of the structural example illustrated in Fig. 2 includes comparators 12A and 12C, reference voltage sources 12B and 12D, and an OR gate 12E. The comparator 12A compares a voltage at the output terminal T22 with a first reference voltage VREF1 output from the reference voltage source 12B and outputs a high level signal if the voltage at the output terminal T22 is the first reference voltage VREF1 or higher. The comparator 12C compares a voltage at the output terminal T22 with a second reference voltage VREF2 (lower than the first reference voltage VREF1) output from the reference voltage source 12D, and outputs a high level signal if the voltage at the output terminal T22 is lower than the second reference voltage VREF2. When at least one of the output signals of the comparators 12A and 12C is a high level, the OR gate 12E sets a signal S1 to the high level, which is output externally from the driving circuit 12 via a terminal T23.

    [0023] The first reference voltage VREF1 is set to a value higher than total forward voltage of the light emitting element Z2, for example, to be a threshold value for determining whether or not there is an abnormality that the light emitting element Z2 is not lighted due to its breaking. The second reference voltage VREF2 is set to a value lower than a forward voltage of one element in the light emitting element Z2, for example, to be a threshold value for determining whether or not there is an abnormality that the light emitting element Z2 is not lighted due to a ground fault. Note that the setting of the first reference voltage VREF1 and the second reference voltage VREF2 in the above example may be changed so that partial lighting of the light emitting element Z2 can be included in the abnormality of the light emitting element Z2.

    [0024] In addition, in order to prevent that the signal S1 changes from the high level despite the light emitting element Z2 is abnormal after the switch SW3 becomes ON state, it is preferred to dispose a holding portion arranged to hold the high level of the signal S1 after it becomes the high level unless it is reset.

    [0025] Here, with reference to Fig. 1A again, the operation of the light emitting device illustrated in Fig. 1A is described. When an abnormality of the light emitting element Z2 is not detected, the signal S1 becomes a low level, and the low level signal S1 makes the switch SW3 to OFF state. Therefore, when an abnormality of the light emitting element Z2 is not detected, the light emitting element Z1 emits light in the first mode, while the light emitting element Z2 emits light both in the second mode and in the first mode.

    [0026] On the other hand, when an abnormality of the light emitting element Z2 is detected, the signal S1 becomes the high level, and the high level signal S1 makes the switch SW3 to ON state, so that the output terminal T22 of the driving circuit 12 is connected to the light emitting element Z1 via the bypass path 3. Therefore, when an abnormality of the light emitting element Z2 is detected, the light emitting element Z1 emits light both in the first mode and in the second mode as illustrated in Fig. 1B. In other words, even if an abnormality occurs in the light emitting element Z2, it is possible to avoid that none of the light emitting elements is lighted in the second mode.

    [0027] With the light emitting device illustrated in Fig. 1A, for example, when the light emitting element Z1 is used as a stop lamp disposed at a rear of a vehicle while the light emitting element Z2 is used as a tail and stop lamp disposed at the rear of the vehicle, if an abnormality occurs in the light emitting element Z2, the light emitting element Z1 performs a function as a tail lamp in addition to an original function as a stop lamp. Therefore, it is possible to avoid that none of lamps disposed at the rear of the vehicle in the tail mode, and hence safety is improved.

    <Second structural example>



    [0028] Fig. 3 is a diagram illustrating a second structural example of the light emitting device. The light emitting device illustrated in Fig. 3 has a structure in which the switches SW1 and SW2 and the diodes D1 to D3 are eliminated from the light emitting device illustrated in Fig. 1, and the driving circuits 1 and 12 in Fig. 1 are respectively replaced with driving circuits 1' and 12'. With this structure, the input voltage VIN is directly applied to the input terminal T11 of the driving circuit 1' and the input terminal T21 of the driving circuit 12'.

    [0029] The driving circuit 1' has a structure in which an enable terminal T13 is added to the driving circuit 1 so as to have an enable function. The driving circuit 1' becomes an enabled state when an enable signal EN11 is supplied to the enable terminal T13, while it becomes a disabled state when the enable signal EN11 is not supplied to the enable terminal T13. For example, a voltage generation circuit disposed in the driving circuit 1' so as to generate an internal power supply voltage becomes an active state when the enable signal EN11 is supplied to the enable terminal T13, while it becomes a non-active state when the enable signal EN11 is not supplied to the enable terminal T13.

    [0030] The driving circuit 12' has a structure in which an enable terminal T24 is added to the driving circuit 12 so as to have an enable function. The driving circuit 12' becomes an enabled state when an enable signal EN12 is supplied to the enable terminal T24, while it becomes a disabled state when the enable signal EN12 is not supplied to the enable terminal T24. For example, a voltage generation circuit disposed in the driving circuit 12' so as to generate an internal power supply voltage becomes an active state when the enable signal EN12 is supplied to the enable terminal T24, while it becomes a non-active state when the enable signal EN12 is not supplied to the enable terminal T24.

    [0031] In the first mode (for example the stop mode), when the enable signal EN 11 is supplied to the enable terminal T13 of the driving circuit 1', the driving circuit 1' can supply power to the light emitting element connected to the output terminal T12. Further, when the enable signal EN12 is supplied to the enable terminal T24 of the driving circuit 12', the driving circuit 12' can supply power to the light emitting element connected to the output terminal T22.

    [0032] In a mode other than the first mode, the enable signal EN11 is not supplied to the enable terminal T13 of the driving circuit 1', and hence the driving circuit 1' cannot supply power to the light emitting element connected to the output terminal T12.

    [0033] In the second mode (for example the tail mode), when the enable signal EN12 is supplied to the enable terminal T24 of the driving circuit 12', the driving circuit 12' can supply power to the light emitting element connected to the output terminal T22.

    [0034] In a mode other than the second mode (for example the tail mode), the enable signal EN12 is not supplied to the enable terminal T24 of the driving circuit 12'. Therefore, in a mode other than the first mode or the second mode, because the enable signal EN12 is not supplied to the enable terminal T24 of the driving circuit 12', the driving circuit 12' cannot supply power to the light emitting element connected to the output terminal T22.

    [0035] Similarly to the light emitting device illustrated in Fig. 1, in the light emitting device illustrated in Fig. 3, even if an abnormality occurs in the light emitting element Z2, it is possible to avoid that none of the light emitting elements is lighted in the second mode. Further, because the light emitting device illustrated in Fig. 3 can eliminate the discrete components (the switches SW1 and SW2 and the diodes D1 to D3), it is possible to achieve a lower cost and a smaller size than the light emitting device illustrated in Fig. 1.

    <Third structural example>



    [0036] Fig. 4 is a diagram illustrating a third structural example of the light emitting device. The light emitting device illustrated in Fig. 4 has a structure in which a switch SW4 is added to the light emitting device illustrated in Fig. 1, and the driving circuit 1 is replaced with a driving circuit 11. The switch SW4 is disposed in the bypass path 3 and is connected in parallel to the switch SW3.

    [0037] The driving circuit 11 has a structure in which the abnormality detection circuit arranged to detect an abnormality of the light emitting element Z1 is added to the driving circuit 1. In other words, the driving circuit 11 includes the abnormality detection circuit arranged to detect an abnormality of the light emitting element Z1. A structural example of the abnormality detection circuit disposed in the driving circuit 11 has a structure in which the terminal T22 in the structure illustrated in Fig. 2 is replaced with the terminal T12, and the terminal T23 is replaced with a terminal T14, from which a signal S2 is output.

    [0038] The first reference voltage VREF1 is set to a value higher than total forward voltage of the light emitting element Z1, for example, to be a threshold value for determining whether or not there is an abnormality that the light emitting element Z1 is not lighted due to its breaking. The second reference voltage VREF2 is set to a value lower than a forward voltage of one element in the light emitting element Z1, for example, to be a threshold value for determining whether or not there is an abnormality that the light emitting element Z1 is not lighted due to a ground fault. Note that the setting of the first reference voltage VREF1 and the second reference voltage VREF2 in the above example may be changed so that partial lighting of the light emitting element Z1 can be included in the abnormality of the light emitting element Z1 .

    [0039] In addition, in order to prevent that the signal S2 changes from the high level despite the light emitting element Z1 is abnormal after the switch SW4 becomes ON state, it is preferred to dispose a holding portion arranged to hold the high level of the signal S2 after it becomes the high level unless it is reset.

    [0040] Here, with reference to Fig. 4 again, the operation of the light emitting device illustrated in Fig. 4 is described. When an abnormality of the light emitting element Z1 is not detected, the signal S2 becomes the low level, and the low level signal S2 makes the switch SW4 to OFF state. Therefore, when an abnormality of the light emitting elements Z1 and Z2 is not detected, the light emitting element Z1 emits light in the first mode, while the light emitting element Z2 emits light both in the second mode and in the first mode.

    [0041] In addition, when an abnormality of the light emitting element Z2 is detected, the signal S1 becomes the high level, and the high level signal S1 makes the switch SW3 to ON state, so that the output terminal T22 of the driving circuit 12 is connected to the light emitting element Z1 via the bypass path 3. Therefore, when an abnormality of the light emitting element Z2 is detected, the light emitting element Z1 emits light both in the first mode and in the second mode. In other words, even if an abnormality occurs in the light emitting element Z2, it is possible to avoid that none of the light emitting elements is lighted in the second mode.

    [0042] In addition, when an abnormality of the light emitting element Z1 is detected, the signal S2 becomes the high level, and the high level signal S2 makes the switch SW4 to ON state, so that the output terminal T12 of the driving circuit 11 is connected to the light emitting element Z2 via the bypass path 3. Therefore, when an abnormality of the light emitting element Z1 is detected, the light emitting element Z2 emits light in the second mode. In the first mode, current is supplied from both the driving circuits 11 and 12, and therefore the light emitting element Z2 emits light with higher luminance than the second mode. Thus, the first mode and the second mode can be easily discriminated from each other based on the light emission state of the light emitting element Z2.

    [0043] Note that it can be regarded that an abnormality of the light emitting element Z1 and an abnormality of the light emitting element Z2 do not occur at the same time, and hence the case where an abnormality of the light emitting element Z1 and an abnormality of the light emitting element Z2 occur at the same time is not considered here.

    <Fourth structural example>



    [0044] Fig. 5 is a diagram illustrating a fourth structural example of the light emitting device. The light emitting device illustrated in Fig. 5 has a structure in which the switches SW3 and SW4 of the light emitting device illustrated in Fig. 4 are integrated so that only the switch SW3 is left, and an OR gate 4 that outputs a logical OR of the signal S1 and the signal S2 is added. ON state and OFF state of the switch SW3 are switched by the output signal of the OR gate 4.

    [0045] The light emitting device illustrated in Fig. 5 produces the same effect as the light emitting device illustrated in Fig. 4.

    <Application>



    [0046] The light emitting device described above can be appropriately used as a tail lamp (appropriately including a side lamp and a back lamp) X11 and a stop lamp X12, for example, as illustrated in Figs. 6 and 7.

    [0047] Note that the light emitting device described above may be provided as an LED rear lamp module Y10 illustrated in Fig. 8. In addition, it may be provided in a form of the light emitting element driving device in which the light emitting elements Z1 and Z2 are eliminated from the light emitting device described above.

    <Other variations>



    [0048] Note that, in the embodiment described above, the structure in which the light emitting diode is used as the light emitting element is exemplified, but the present invention is not limited to this structure. For example, it is also possible to use an organic electro-luminescence (EL) element as the light emitting element.

    [0049] In addition, other than the embodiment described above, the various technical features disclosed in this specification can be variously modified within the scope of the technical invention without deviating from the spirit thereof. For example, the diode D2 may be eliminated in the first, third, and fourth structural examples. In this case, the light emitting element Z2 is used not as the tail and stop lamp but as the tail lamp, for example. However, in the third and fourth structural examples, when an abnormality occurs in the light emitting element Z1, the light emitting element Z1 performs the function as the stop lamp in addition to the original function as the tail lamp. In addition, the abnormality detection circuit disposed in the driving circuit 12 may perform the detection operation only in the second mode. In addition, the abnormality detection circuit disposed in the driving circuit 11 may perform the detection operation only in the first mode.

    [0050] In other words, the embodiment described above is merely an example in every aspect and should not be interpreted as a limitation. The scope of the present invention is defined not by the above description of the embodiment but by the claims, which should be understood to include all modifications within meanings and scopes equivalent to the claims.

    <Summary>



    [0051] The light emitting element driving device described above includes a first driving circuit arranged to be capable of supplying power to a light emitting element connected to an output terminal in a first mode, and to be disabled to supply power to the light emitting element connected to the output terminal in a mode other than the first mode, a second driving circuit arranged to be capable of supplying power to a light emitting element connected to an output terminal in a second mode, a first abnormality detecting portion arranged to detect an abnormality of the light emitting element normally connected to the output terminal of the second driving circuit at least in the second mode, a bypass path connecting the output terminal of the first driving circuit to the output terminal of the second driving circuit, and a first switching portion disposed in the bypass path so as to make the bypass path into a conductive state when an abnormality is detected by the first abnormality detecting portion, and to make the bypass path into a cutoff state when an abnormality is not detected by the first abnormality detecting portion (first structure).

    [0052] In addition, the light emitting element driving device of the first structure described above may have a structure, in which the second driving circuit is capable of supplying power to the light emitting element connected to the output terminal in the first mode and is disabled to supply power to the light emitting element connected to the output terminal in a mode other than the first mode or the second mode (second structure).

    [0053] In addition, the light emitting element driving device of the first or second structure described above may further include a control portion arranged to control supply of input power to the first driving circuit and the second driving circuit, in which the control portion supplies the input power to the first driving circuit in the first mode and does not supply the input power to the first driving circuit in a mode other than the first mode, while the control portion supplies the input power to the second driving circuit in the second mode (third structure).

    [0054] In addition, the light emitting element driving device of the third structure described above may have a structure, in which the control portion supplies the input power to the second driving circuit in the first mode and does not supply the input power to the second driving circuit in a mode other than the first mode or the second mode (fourth structure).

    [0055] In addition, the light emitting element driving device of the first or second structure described above may have a structure, in which the first driving circuit becomes an enabled state in the first mode and becomes a disabled state in a mode other than the first mode, and the second driving circuit becomes an enabled state in the second mode (fifth structure).

    [0056] In addition, the light emitting element driving device of the fifth structure described above may have a structure, in which the second driving circuit becomes an enabled state in the first mode and becomes a disabled state in a mode other than the first mode or the second mode (sixth structure).

    [0057] In addition, the light emitting element driving device of the fifth or sixth structure described above may further include a second abnormality detecting portion arranged to detect an abnormality of the light emitting element normally connected to the output terminal of the first driving circuit at least in the first mode, and a second switching portion disposed in the bypass path so as to make the bypass path into a conductive state when an abnormality is detected by the second abnormality detecting portion, and to make the bypass path into a cutoff state when an abnormality is not detected by the second abnormality detecting portion (seventh structure).

    [0058] The light emitting device described above includes the light emitting element driving device according to any one of the first to seventh structures, a first light emitting element normally connected to the output terminal of the first driving circuit, and a second light emitting element normally connected to the output terminal of the second driving circuit (eighth structure).

    [0059] In addition, the light emitting device of the eighth structure described above may have a structure in which each of the first light emitting element and the second light emitting element is a light emitting diode or an organic EL element (ninth structure).

    [0060] In addition, the light emitting device of the eighth or ninth structure described above may have a structure in which the first light emitting element is used as a stop lamp, and the second light emitting element is used as a tail lamp or a tail and stop lamp (tenth structure).

    [0061] In addition, the light emitting device of the tenth structure described above may have a structure in which the light emitting device is mounted as a rear lamp module in a vehicle (eleventh structure).

    [0062] The vehicle described above includes the light emitting device according to the eighth or ninth structure (twelfth structure).


    Claims

    1. A light emitting element driving device comprising:

    a first driving circuit (11) arranged to be capable of supplying power to a light emitting element (Z1) connected to an output terminal of said first driving circuit (11) in a first mode, and to be disabled to supply power to the light emitting element connected to the output terminal of said first driving circuit (11) in a mode other than the first mode;

    characterized in that it comprises

    a second driving circuit (12) arranged to be capable of supplying power to a light emitting element (Z2) connected to an output terminal of said second driving circuit (12) in a second mode;

    a first abnormality detection circuit arranged to detect an abnormality of the light emitting element (Z2) connected to the output terminal of the second driving circuit (12) at least in the second mode;

    a bypass path (3) connecting the output terminal of the first driving circuit (11) to the output terminal of the second driving circuit (12); and

    a first switching portion disposed in the bypass path (3) so as:

    - to make the bypass path (3) into a conductive state to connect together the light emitting element (Z1) connected to the output terminal of the first driving circuit (11) and the output terminal of the second driving circuit (12) when an abnormality is detected by the first abnormality detection circuit, and

    - to make the bypass path (3) into a cutoff state not to connect together the light emitting element (Z1) connected to the output terminal of the first driving circuit (11) and the output terminal of the second driving circuit (12) when an abnormality is not detected by the first abnormality detection circuit,

    wherein the first driving circuit (11) is capable of supplying power to the light emitting element connected to the output terminal of said first driving circuit (11) in the first mode even when the bypass path (3) is in the cutoff state.


     
    2. The light emitting element driving device according to claim 1, further comprising:

    a second abnormality detection circuit arranged to detect an abnormality of the light emitting element (Z1) connected to the output terminal of the first driving circuit (11) at least in the first mode;

    - wherein the first switching portion makes the bypass path (3) into the conductive state to connect together the output terminals of the first driving circuit (11) and the second driving circuit (12) when an abnormality is detected by the second abnormality detection circuit, and

    makes the bypass path (3) into a cutoff state not to connect together the output terminals of the first driving circuit (11) and the second driving circuit (12) when an abnormality is not detected either by the second abnormality detection circuit.


     
    3. The light emitting element driving device according to claim 2, characterized in that the second driving circuit (12) is capable of supplying power to the light emitting element (Z2) connected to the output terminal of said second driving circuit (12) in the first mode and is disabled to supply power to the light emitting element connected to the output terminal of said second driving circuit (12) in a mode other than the first mode or the second mode.
     
    4. The light emitting element driving device according to claim 2 or 3, further comprising a control portion arranged to control supply of input power to the first driving circuit (11) and the second driving circuit (12), characterized in that
    the control portion supplies the input power to the first driving circuit (11) in the first mode and does not supply the input power to the first driving circuit (11) in a mode other than the first mode, while the control portion supplies the input power to the second driving circuit (12) in the second mode.
     
    5. The light emitting element driving device according to claim 4, characterized in that the control portion supplies the input power to the second driving circuit (12) in the first mode and does not supply the input power to the second driving circuit (12) in a mode other than the first mode or the second mode.
     
    6. The light emitting element driving device according to claim 2 or 3, characterized in that

    the first driving circuit (11) becomes an enabled state in the first mode and becomes a disabled state in a mode other than the first mode, and

    the second driving circuit (12) becomes an enabled state in the second mode.


     
    7. The light emitting element driving device according to claim 6, characterized in that the second driving circuit (12) becomes an enabled state in the first mode and becomes a disabled state in a mode other than the first mode or the second mode.
     
    8. The light emitting element driving device according to claim 1, further comprising:

    a second abnormality detection circuit arranged to detect an abnormality of the light emitting element (Z1) connected to the output terminal of the first driving circuit (11) at least in the first mode; and

    a second switching portion disposed in the bypass path so as:

    - to make the bypass path (3) into a conductive state to connect together the output terminals of the first driving circuit (11) and the second driving circuit (12) when an abnormality is detected by the second abnormality detection circuit, and

    - to make the bypass path (3) into a cutoff state not to connect together the output terminals of the first driving circuit (11) and the second driving circuit (12) when an abnormality is not detected by the second abnormality detection circuit.


     
    9. The light emitting element driving device according to claim 1, further comprising:

    a second abnormality detection circuit arranged to detect an abnormality of the light emitting element (Z1) connected to the output terminal of the first driving circuit (11) at least in the first mode; and

    an OR circuit arranged to output a logical OR of outputs of the first and second abnormality detection circuits,

    wherein the first switching portion is controlled by an output of the OR circuit.


     
    10. The light emitting element driving device according to claim 1 or 9, wherein when the bypass path (3) is in the conductive state, the light emitting element (Z1) connected to the output terminal of the first driving circuit (11) and the light emitting element (Z2) connected to the output terminal of the second driving circuit (12) are connected in parallel with each other.
     
    11. The light emitting element driving device according to any one of claims 1, 9 and 10, further comprising:

    a control portion arranged to control input power to the first driving circuit (11) and the second driving circuit (12),

    wherein the control portion includes:

    a first mode switch which is in an ON state in the first mode,

    a second mode switch which is in an ON state in the second mode,

    a first diode,

    a second diode, and

    a third diode,

    wherein an input voltage is applied to one end of the first mode switch and is applied to one end of the second mode switch,

    the other end of the first mode switch is connected to an input terminal of the first driving circuit (11) via the first diode and is connected to an input terminal of the second driving circuit (12) via the second diode, and

    the other end of the second mode switch is connected to the input terminal of the second driving circuit (12) via the third diode.


     
    12. A light emitting device comprising:

    the light emitting element driving device according to any one of claims 1 to 11;

    a first light emitting element (Z1) connected to the output terminal of the first driving circuit (11); and

    a second light emitting element (Z2) connected to the output terminal of the second driving circuit (12).


     
    13. The light emitting device according to claim 12, characterized in that each of the first light emitting element (Z1) and the second light emitting element (Z2) is a light emitting diode or an organic EL element.
     
    14. The light emitting device according to claim 12 or 13, characterized in that

    the first light emitting element (Z1) is used as a stop lamp, and

    the second light emitting element (Z2) is used as a tail lamp or a tail and stop lamp.


     
    15. The light emitting device according to claim 14, characterized in that the light emitting device is mounted as a rear lamp module in a vehicle.
     
    16. A vehicle comprising the light emitting device according to claim 14 or 15.
     


    Ansprüche

    1. Ansteuerungsvorrichtung für lichtemittierendes Element, umfassend:

    eine erste Treiberschaltung (11), die dafür ausgelegt ist, einem lichtemittierenden Element (Z1), das mit einem Ausgangsanschluss der ersten Treiberschaltung (11) verbunden ist, in einem ersten Modus Strom zuführen zu können, und in einem anderen Modus als dem ersten Modus deaktiviert werden zu können, um dem lichtemittierenden Element, das mit dem Ausgangsanschluss der ersten Treiberschaltung (11) verbunden ist, Strom zuzuführen;

    dadurch gekennzeichnet, dass sie Folgendes umfasst:

    eine zweite Treiberschaltung (12), die dafür ausgelegt ist, einem lichtemittierenden Element (Z2), das mit einem Ausgangsanschluss der zweiten Treiberschaltung (12) verbunden ist, in einem zweiten Modus Strom zuführen zu können;

    eine erste Anomaliedetektionsschaltung, die dafür ausgelegt ist, eine Anomalie des lichtemittierenden Elements (Z2), das mit dem Ausgangsanschluss der zweiten Treiberschaltung (12) verbunden ist, mindestens im zweiten Modus zu detektieren;

    einen Umgehungspfad (3), der den Ausgangsanschluss der ersten Treiberschaltung (11) mit dem Ausgangsanschluss der zweiten Treiberschaltung (12) zu verbinden; und

    einen ersten Schaltabschnitt, der in dem Umgehungspfad (3) angeordnet ist, um:

    - den Umgehungspfad (3) in einen leitfähigen Zustand zu versetzen, um das lichtemittierende Element (Z1), das mit dem Ausgangsanschluss der ersten Treiberschaltung (11) verbunden ist, und den Ausgangsanschluss der zweiten Treiberschaltung (12) miteinander zu verbinden, wenn durch die erste Anomaliedetektionsschaltung eine Anomalie detektieren wird, und

    - den Umgehungspfad (3) in einen Abschaltzustand zu versetzen, um das lichtemittierende Element (Z1), das mit dem Ausgangsanschluss der ersten Treiberschaltung (11) verbunden ist, und den Ausgangsanschluss der zweiten Treiberschaltung (12) nicht miteinander zu verbinden, wenn durch die erste Anomaliedetektionsschaltung keine Anomalie detektieren wird, und

    wobei die erste Treiberschaltung (11) in der Lage ist, dem lichtemittierenden Element, das mit dem Ausgangsanschluss der ersten Treiberschaltung (11) verbunden ist, im ersten Modus Strom zuzuführen, selbst wenn sich der Umgehungspfad (3) im Abschaltzustand befindet.


     
    2. Ansteuerungsvorrichtung für lichtemittierendes Element nach Anspruch 1, des Weiteren umfassend:

    eine zweite Anomaliedetektionsschaltung, die dafür ausgelegt ist, eine Anomalie des lichtemittierenden Elements (Z1), das mit dem Ausgangsanschluss der ersten Treiberschaltung (11) verbunden ist, mindestens im ersten Modus zu detektieren;

    - wobei der erste Schaltabschnitt den Umgehungspfad (3) in den leitfähigen Zustand versetzt, um die Ausgangsanschlüsse der ersten Treiberschaltung (11) und der zweiten Treiberschaltung (12) miteinander zu verbinden, wenn eine Anomalie durch die zweite Anomaliedetektionsschaltung detektiert wird, und

    den Umgehungspfad (3) in einen Abschaltzustand versetzt, um die Ausgangsanschlüsse der ersten Treiberschaltung (11) und der zweiten Treiberschaltung (12) nicht miteinander zu verbinden, wenn auch durch die zweite Anomaliedetektionsschaltung keine Anomalie detektiert wird.


     
    3. Ansteuerungsvorrichtung für lichtemittierendes Element nach Anspruch 2, dadurch gekennzeichnet, dass die zweite Treiberschaltung (12) in der Lage ist, dem lichtemittierenden Element (Z2), das mit dem Ausgangsanschluss der zweiten Treiberschaltung (12) verbunden ist, im ersten Modus Strom zuzuführen, und in einem anderen Modus als dem ersten Modus oder dem zweiten Modus deaktiviert ist, um dem lichtemittierenden Element, das mit dem Ausgangsanschluss der zweiten Treiberschaltung (12) verbunden ist, keinen Strom zuführen zu können.
     
    4. Ansteuerungsvorrichtung für lichtemittierendes Element nach Anspruch 2 oder 3, des Weiteren umfassend einen Steuerungsabschnitt, der dafür ausgelegt ist, die Zufuhr von Eingangsleistung zu der ersten Treiberschaltung (11) und der zweiten Treiberschaltung (12) zu steuern, dadurch gekennzeichnet, dass
    der Steuerungsabschnitt im ersten Modus die Eingangsleistung in die erste Treiberschaltung (11) einspeist und in einem anderen Modus als dem ersten Modus keine Eingangsleistung in die erste Treiberschaltung (11) einspeist, während der Steuerungsabschnitt im zweiten Modus die Eingangsleistung in die zweite Treiberschaltung (12) einspeist.
     
    5. Ansteuerungsvorrichtung für lichtemittierendes Element nach Anspruch 4, dadurch gekennzeichnet, dass der Steuerungsabschnitt die Eingangsleistung im ersten Modus in die zweite Treiberschaltung (12) einspeist und in einem anderen Modus als dem ersten oder dem zweiten Modus keine Eingangsleistung in die zweite Treiberschaltung (12) einspeist.
     
    6. Ansteuerungsvorrichtung für lichtemittierendes Element nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die erste Treiberschaltung (11) im ersten Modus in einen aktivierten Zustand übergeht und in einem anderen Modus als dem ersten Modus in einen deaktivierten Zustand übergeht, und
    die zweite Treiberschaltung (12) im zweiten Modus in einen aktivierten Zustand übergeht.
     
    7. Ansteuerungsvorrichtung für lichtemittierendes Element nach Anspruch 6, dadurch gekennzeichnet, dass die zweite Treiberschaltung (12) im ersten Modus in einen aktivierten Zustand übergeht und in einem anderen Modus als dem ersten oder dem zweiten Modus in einen deaktivierten Zustand übergeht.
     
    8. Ansteuerungsvorrichtung für lichtemittierendes Element nach Anspruch 1, des Weiteren umfassend:

    eine zweite Anomaliedetektionsschaltung, die dafür ausgelegt ist, eine Anomalie des lichtemittierenden Elements (Z1), das mit dem Ausgangsanschluss der ersten Treiberschaltung (11) verbunden ist, mindestens im ersten Modus zu detektieren; und

    einen zweiten Schaltabschnitt, der in dem Umgehungspfad angeordnet ist, um:

    - den Umgehungspfad (3) in den leitfähigen Zustand zu versetzen, um die Ausgangsanschlüsse der ersten Treiberschaltung (11) und der zweiten Treiberschaltung (12) miteinander zu verbinden, wenn eine Anomalie durch die zweite Anomaliedetektionsschaltung detektiert wird, und

    - den Umgehungspfad (3) in einen Abschaltzustand zu versetzen, um die Ausgangsanschlüsse der ersten Treiberschaltung (11) und der zweiten Treiberschaltung (12) nicht miteinander zu verbinden, wenn durch die zweite Anomaliedetektionsschaltung keine Anomalie detektiert wird.


     
    9. Ansteuerungsvorrichtung für lichtemittierendes Element nach Anspruch 1, des Weiteren umfassend:

    eine zweite Anomaliedetektionsschaltung, die dafür ausgelegt ist, eine Anomalie des lichtemittierenden Elements (Z1), das mit dem Ausgangsanschluss der ersten Treiberschaltung (11) verbunden ist, mindestens im ersten Modus zu detektieren; und

    eine ODER-Schaltung, die dafür ausgelegt ist, ein logisches ODER von Ausgängen der ersten und der zweiten Anomalie-Erkennungsschaltung auszugeben,

    wobei der erste Schaltabschnitt durch einen Ausgang der ODER-Schaltung gesteuert wird.


     
    10. Ansteuerungsvorrichtung für lichtemittierendes Element nach Anspruch 1 oder 9, wobei, wenn sich der Umgehungspfad (3) im leitfähigen Zustand befindet, das lichtemittierende Element (Z1), das mit dem Ausgangsanschluss der ersten Treiberschaltung (11) verbunden ist, und das lichtemittierende Element (Z2), das mit dem Ausgangsanschluss der zweiten Treiberschaltung (12) verbunden ist, zueinander parallel geschaltet werden.
     
    11. Ansteuerungsvorrichtung für lichtemittierendes Element nach einem der Ansprüche 1, 9 und 10, umfassend:

    einen Steuerungsabschnitt, der dafür ausgelegt ist, die Eingangsleistung in die erste Treiberschaltung (11) und die zweite Treiberschaltung (12) zu steuern,

    wobei der Steuerungsabschnitt Folgendes umfasst:

    einen ersten Modusschalter, der sich im ersten Modus in einem EIN-Zustand befindet,

    einen zweiten Modusschalter, der sich im zweiten Modus in einem EIN-Zustand befindet,

    eine erste Diode,

    eine zweite Diode und

    eine dritte Diode,

    wobei eine Eingangsspannung an ein Ende des ersten Modusschalters angelegt wird und an ein Ende des zweiten Modusschalters angelegt wird,

    das andere Ende des ersten Modusschalters über die erste Diode mit einem Eingangsanschluss der ersten Treiberschaltung (11) verbunden ist und über die zweite Diode mit einem Eingangsanschluss der zweiten Treiberschaltung (12) verbunden ist, und

    das andere Ende des zweiten Modusschalters über die dritte Diode mit dem Eingangsanschluss der zweiten Treiberschaltung (12) verbunden ist.


     
    12. Leuchtvorrichtung, umfassend:

    die Ansteuerungsvorrichtung für lichtemittierendes Element nach einem der Ansprüche 1 bis 11;

    ein erstes lichtemittierendes Element (Z1), das mit dem Ausgangsanschluss der ersten Treiberschaltung (11) verbunden ist; und

    ein zweites lichtemittierendes Element (Z2), das mit dem Ausgangsanschluss der zweiten Treiberschaltung (12) verbunden ist.


     
    13. Leuchtvorrichtung nach Anspruch 12, dadurch gekennzeichnet, dass sowohl das erste lichtemittierende Element (Z1) als auch das zweite lichtemittierende Element (Z2) eine Leuchtdiode oder ein organisches EL-Element ist.
     
    14. Leuchtvorrichtung nach Anspruch 12 oder 13, dadurch gekennzeichnet, dass
    das erste lichtemittierende Element (Z1) als Bremsleuchte verwendet wird und
    das zweite lichtemittierende Element (Z2) als Schlussleuchte oder als Schluss- und Bremsleuchte verwendet wird.
     
    15. Leuchtvorrichtung nach Anspruch 14, dadurch gekennzeichnet, dass die Leuchtvorrichtung als Rückleuchtenmodul in einem Fahrzeug montiert ist.
     
    16. Fahrzeug, umfassend die Leuchtvorrichtung nach Anspruch 14 oder 15.
     


    Revendications

    1. Dispositif de commande d'éléments électroluminescents, comprenant :

    un premier circuit de commande (11) conçu pour être capable d'alimenter en énergie un élément électroluminescent (Z1) connecté à une borne de sortie dudit premier circuit de commande (11) dans un premier mode, et pour être incapable d'alimenter en énergie l'élément électroluminescent connecté à la borne de sortie dudit premier circuit de commande (11) dans un mode autre que le premier mode ;

    caractérisé en ce qu'il comprend :

    un second circuit de commande (12) conçu pour être capable d'alimenter en énergie un élément électroluminescent (Z2) connecté à une borne de sortie dudit second circuit de commande (12) dans un second mode ;

    un premier circuit de détection d'anomalie, conçu pour détecter une anomalie de l'élément électroluminescent (Z2) connecté à la borne de sortie du second circuit de commande (12) au moins dans le second mode ;

    un trajet de dérivation (3) connectant la borne de sortie du premier circuit de commande (11) à la borne de sortie du second circuit de commande (12) ; et

    une première partie de commutation disposée sur le trajet de dérivation (3) de manière à :

    - faire passer le trajet de dérivation (3) à un état de conduction pour connecter entre eux le premier élément électroluminescent (Z1) connecté à la borne de sortie du premier circuit de commande (11) et la borne de sortie du second circuit de commande (12), lorsqu'une anomalie est détectée par le premier circuit de détection d'anomalie, et

    - faire passer le trajet de dérivation (3) à un état de coupure pour ne pas connecter entre eux l'élément électroluminescent (Z1) connecté à la borne de sortie du premier circuit de commande (11) et la borne de sortie du second circuit de commande (12), lorsqu'une anomalie n'est pas détectée par le premier circuit de détection d'anomalie,

    dans lequel le premier circuit de commande (11) est capable d'alimenter en énergie l'élément électroluminescent connecté à la borne de sortie dudit premier circuit de commande (11) dans le premier mode, même si le trajet de dérivation (3) est dans le mode de coupure.


     
    2. Dispositif de commande d'éléments électroluminescents, selon la revendication 1, comprenant en outre :

    un second circuit de détection d'anomalie, conçu pour détecter une anomalie de l'élément électroluminescent (Z1) connecté à la borne de sortie du premier circuit de commande (11) au moins dans le premier mode ;

    dans lequel la première partie de commutation fait passer le trajet de dérivation (3) à l'état de conduction pour connecter entre eux les bornes de sortie du premier circuit de commande (11) et le second circuit de commande (12), lorsqu'une anomalie est détectée par le second circuit de détection d'anomalie, et

    fait passer le trajet de dérivation (3) à un état de coupure pour ne pas connecter entre eux les bornes de sortie du premier circuit de commande (11) et le second circuit de commande (12), lorsqu'une anomalie n'est pas détectée non plus par le second circuit de détection d'anomalie.


     
    3. Dispositif de commande d'éléments électroluminescents, selon la revendication 2, caractérisé en ce que le second circuit de commande (12) est capable d'alimenter en énergie l'élément électroluminescent (Z2) connecté à la borne de sortie dudit second circuit de commande (12) dans le premier mode et est incapable d'alimenter en énergie l'élément électroluminescent connecté à la borne de sortie dudit second circuit de commande (12) dans un mode autre que le premier mode ou le second mode.
     
    4. Dispositif de commande d'éléments électroluminescents, selon la revendication 2 ou 3, comprenant en outre une partie de commande, conçue pour commander l'application d'une puissance d'entrée au premier circuit de commande (11) et au second circuit de commande (12), caractérisé en ce que :
    la partie de commande applique la puissance d'entrée au premier circuit de commande (11) dans le premier mode et n'applique pas la puissance d'entrée au premier circuit de commande (11) dans un mode autre que le premier mode, tandis que la partie de commande applique la puissance d'entrée au second circuit de commande (12) dans le second mode.
     
    5. Dispositif de commande d'éléments électroluminescents, selon la revendication 4, caractérisé en ce que la partie de commande applique la puissance d'entrée au second circuit de commande (12) dans le premier mode et n'applique pas la puissance d'entrée au second circuit de commande (12) dans un mode autre que le premier mode ou le second mode.
     
    6. Dispositif de commande d'éléments électroluminescents, selon la revendication 2 ou 3, caractérisé en ce que :
    le premier circuit de commande (11) passe à un état de capacité dans le premier mode et passe à un état d'incapacité dans un mode autre que le premier mode, et le second circuit de commande (12) passe à un état de capacité dans le second mode.
     
    7. Dispositif de commande d'éléments électroluminescents, selon la revendication 6, caractérisé en ce que le second circuit de commande (12) passe à un état de capacité dans le premier mode et passe à un état d'incapacité dans un mode autre que le premier mode ou le second mode.
     
    8. Dispositif de commande d'éléments électroluminescents, selon la revendication 1, comprenant en outre :

    un second circuit de détection d'anomalie, conçu pour détecter une anomalie de l'élément électroluminescent (Z1) connecté à la borne de sortie du premier circuit de commande (11) au moins dans le premier mode ; et

    une seconde partie de commutation disposée sur le trajet de dérivation, de manière à :

    - faire passer le trajet de dérivation (3) à un état de conduction pour connecter entre eux les bornes de sortie du premier circuit de commande (11) et le second circuit de commande (12), lorsqu'une anomalie est détectée par le second circuit de détection d'anomalie, et

    - faire passer le trajet de dérivation (3) à un état de coupure pour ne pas connecter entre eux les bornes de sortie du premier circuit de commande (11) et le second circuit de commande (12), lorsqu'une anomalie n'est pas détectée par le second circuit de détection d'anomalie.


     
    9. Dispositif de commande d'éléments électroluminescents, selon la revendication 1, comprenant en outre :

    un second circuit de détection d'anomalie, conçu pour détecter une anomalie de l'élément électroluminescent (Z1) connecté à la borne de sortie du premier circuit de commande (11) au moins dans le premier mode ; et

    un circuit OU conçu pour délivrer un OU logique de sorties des premier et second circuits de détection d'anomalie, dans lequel la première partie de commutation est commandée par une sortie du circuit OU.


     
    10. Dispositif de commande d'éléments électroluminescents, selon la revendication 1 ou 9, dans lequel lorsque le trajet de dérivation (3) est dans l'état de conduction, l'élément électroluminescent (Z1) connecté à la borne de sortie du premier circuit de commande (11) et l'élément électroluminescent (Z2) connecté à la borne de sortie du second circuit de commande (12) sont connectés en parallèle entre eux.
     
    11. Dispositif de commande d'éléments électroluminescents, selon l'une quelconque des revendications 1, 9 et 10, comprenant en outre :

    une partie de commande conçue pour commander l'application d'une puissance d'entrée au premier circuit de commande (11) et au second circuit de commande (12),

    dans lequel la partie de commande comporte :

    un commutateur de premier mode qui est à l'état passant dans le premier mode,

    un commutateur de second mode qui est à l'état passant dans le second mode,

    une première diode,

    une deuxième diode, et

    une troisième diode,

    dans lequel une tension d'entrée est appliquée à une extrémité du commutateur de premier mode et est appliquée à une extrémité du commutateur de second mode,

    l'autre extrémité du commutateur de premier mode est connectée à une borne d'entrée du premier circuit de commande (11) par le biais de la première diode et est connectée à une borne d'entrée du second circuit de commande (12) par le biais de la deuxième diode, et l'autre extrémité du commutateur de second mode est connectée à la borne d'entrée du second circuit de commande (12) par le biais de la troisième diode.


     
    12. Dispositif électroluminescent comprenant :

    le dispositif de commande d'éléments électroluminescents selon l'une quelconque des revendications 1 à 11 ;

    un premier élément électroluminescent (Z1) connecté à la borne de sortie du premier circuit de commande (11) ; et

    un second élément électroluminescent (Z2) connecté à la borne de sortie du second circuit de commande (12).


     
    13. Dispositif électroluminescent selon la revendication 12, caractérisé en ce que le premier élément électroluminescent (Z1) et le second élément électroluminescent (Z2) sont chacun une diode électroluminescente ou un élément électroluminescent organique.
     
    14. Dispositif électroluminescent selon la revendication 12 ou 13, caractérisé en ce que :

    le premier élément électroluminescent (Z1) est utilisé en tant que feu-stop, et

    le second élément électroluminescent (Z2) est utilisé en tant que feu arrière ou en tant que feu arrière et feu-stop.


     
    15. Dispositif électroluminescent selon la revendication 14, caractérisé en ce que le dispositif électroluminescent est monté en tant que module de feu arrière sur un véhicule.
     
    16. Véhicule comprenant le dispositif électroluminescent selon la revendication 14 ou 15.
     




    Drawing



























    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description