• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention proposes a method for calibrating the electric supply current of at least one elementary light source with a semiconductor element. The method furthermore makes it possible to impact the light characteristics of the light source, which may be an integral part of a matrix of light sources, by acting on a pulse width modulation signal which serves to control the power supply of the light source. source.
    公开号:FR3056071A1
    申请号:FR1658657
    申请日:2016-09-15
    公开日:2018-03-16
    发明作者:Nicolas Lefaudeux；Antoine De Lamberterie；Guillaume THIN；Samira MBATA；Thomas Canonne；Van-Thai HOANG；Francois-Xavier AMIEL；Vincent DuBois
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    ® FRENCH REPUBLIC
    NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number: 3,056,071 (to be used only for reproduction orders)
    ©) National registration number: 16 58657
    COURBEVOIE
    ©) Int Cl 8 : H 05 B 37/02 (2017.01), H 05 B 33/08, G 05 D 25/02
    A1 PATENT APPLICATION
    ©) Date of filing: 15.09.16. ©) Applicant (s): VALEO VISION Joint-stock company ©) Priority: simplified - FR. (72) Inventor (s): LEFAUDEUX NICOLAS, DE LAMBER- TERIE ANTOINE, THIN GUILLAUME, MBATA (43) Date of public availability of the SAMIRA, CANONNE THOMAS, HOANG VAN-THAI, request: 16.03.18 Bulletin 18/11) AMIEL FRANÇOIS-XAVIER and DUBOIS VINCENT. (56) List of documents cited in the report preliminary research: Refer to end of present booklet @) References to other national documents (73) Holder (s): VALEO VISION Joint stock company related: folded. ©) Extension request (s): ©) Agent (s): VALEO VISION Limited company.
    METHOD FOR CALIBRATING THE INTENSITY OF AN ELECTRIC CURRENT FOR SUPPLYING LIGHT-EMITTING LIGHT SOURCES TO OBTAIN A UNIFORM LIGHT.
    FR 3 056 071 - A1
    The invention proposes a method for calibrating the electric power supply for at least one elementary light source with a semiconductor element. The method also makes it possible to impact the light characteristics of the light source, which can be an integral part of a matrix of light sources, by acting on a pulse width modulation signal which is used to control the power supply of source.

    i
    METHOD FOR CALIBRATING THE INTENSITY OF AN ELECTRIC CURRENT FOR SUPPLYING LIGHT-EMITTING LIGHT SOURCES TO OBTAIN A UNIFORM LIGHT
    The invention relates to the field of controlling the power supply of light components for use in light modules for motor vehicles.
    The use of light-emitting diodes, LEDs, with generally low energy consumption, is increasingly recommended in the field of motor vehicles, in order to perform light functions such as daytime running lights, signaling lights, or for example the direction indicator lights. An LED emits light when a charging voltage having at least a predetermined value is applied across its terminals. The intensity of the light emitted by an LED is generally a function of the intensity of the charge current flowing through it.
    In the field of light devices for motor vehicles, it is known to use modules involving a plurality of LEDs mounted in the form of a generally rectangular matrix. Each LED is an elementary light source which is advantageously controlled by electric current individually and independently of the other LEDs of the matrix. In fact, each LED can be considered as representing a pixel of a rectangular range, the light intensity of which can be determined according to the needs of the intended application. When all the LEDs of such a module emit light uniformly, the module can be compared to a source making a generally rectangular optical imprint. However, by selectively supplying subsets of pixels, it becomes possible to create optical imprints having various geometries. By way of example, such a configuration makes it possible to produce a front light which does not dazzle passing traffic, by selectively lowering the brightness only of the pixels which illuminate the central or left side of the road, while substantially illuminating the right side of the road. Obviously, more complex configurations are also achievable using such devices.
    When a matrix of LEDs is used to perform a specific light function of a motor vehicle, it is important that the color and the light intensity of each elementary source of the matrix are uniform. When assembling an LED array, it is therefore careful to use LEDs with similar electrical and optical characteristics. The LEDs which will constitute a matrix are chosen so that they can emit light of the same color and of the same light intensity when an electric current of the same intensity passes through them. However, the aging of components can imply that the electrical characteristics of a semiconductor junction, and therefore its luminous characteristics at an electric current of a given intensity changes during the lifetime of the component. The result is matrices whose elementary sources no longer emit the same type of light.
    The problem which has just been described is particularly pronounced in so-called “monolithic” light components, which involve a plurality of electroluminescent semiconductor elements epitaxially directly on a common substrate, the substrate generally being formed of silicon. In contrast to conventional LED arrays, in which each elementary light source is an electronic component produced individually and mounted on a substrate such as a printed circuit, PCB, a monolithic component is to be considered as a single electronic component, during the production of which several ranges of light-emitting semiconductor junctions are generated on a common substrate, in the form of a matrix. This production technique makes it possible to produce electroluminescent areas, each serving as an elementary light source, very close to one another. The interstices between the elementary sources can have submillimetric dimensions. An advantage of this production technique is the high level of pixel density that can result on a single substrate. However, this also results in a lack of uniformity among the elementary sources constituting the matrix. Sources are generally not all capable of emitting the same color of light at the same light intensity if an electric current of common intensity is passed through them. However, it is all the more impossible to replace a given elementary source, since each elementary source is an integral part of the monolithic matrix compound.
    The invention aims to overcome at least one of the problems posed by the prior art. In particular, the object of the invention is to propose a method for calibrating the intensity of the supply current of elementary light sources, in particular constituting a matrix of electroluminescent light sources, so that each elementary source, powered by its calibrated electric current, emits light of a color and a light intensity close to predetermined reference values.
    The subject of the invention is a method for calibrating the intensity of an electric current supplying at least one elementary light source with a semiconductor element. The process is remarkable in that it includes the following stages:
    using an electric current source, supplying an electric supply current to the light source, the electric current having an average intensity and being modulated using a first pulse width modulation signal , the signal being characterized by an intensity of the peak current and a duty cycle;
    measure, using measuring means, the light intensity or the color of the light emitted by the powered light source;
    using comparison means, compare the measured value with a predetermined light intensity value or with a predetermined color serving as a reference;
    using control means of the electric current source, modify the value of the intensity of the peak current and / or the duty cycle of the first pulse width modulation signal to obtain a second modulation signal pulse width if the compared values do not substantially match;
    so that the light emitted by the light source has a measured light intensity value or a measured color which are closer to the respective reference values, when the light source is supplied by an electric current modulated using the second pulse width modulation signal.
    The color of the light emitted by the powered light source can preferably be measured by its temperature in degrees Kelvin, by its wavelength spectrum or by its chromatic coordinates.
    The measurement step may preferably include the step of measuring the color of the light emitted by the powered light source. In addition, the modification step may preferably include the following step, the reference color corresponding to white light:
    if the color measured corresponds to a more yellow color than the reference color, modify the first pulse width modulation signal by increasing the intensity of the peak current and by decreasing the duty cycle, so that the current The electric current modulated by the first pulse width modulation signal and the electric current modulated by the second pulse width modulation signal have substantially equal average intensities.
    The reference color of the emitted light may preferably include light having a wavelength between 400 and 700 nm.
    Preferably, the measurement step can comprise the step of measuring the color of the light emitted by the powered light source, and the modification step can also comprise the following step, the reference color corresponding to the White light :
    if the color measured corresponds to a bluer color than the reference color, modify the first pulse width modulation signal by decreasing the intensity of the peak current and increasing the duty cycle, so that the current The electric current modulated by the first pulse width modulation signal and the electric current modulated by the second pulse width modulation signal have substantially equal average intensities.
    Preferably, the measurement step can comprise the step of measuring the light intensity of the light emitted by the light source supplied, and the modification step can also comprise the following step:
    if the light intensity is lower than the reference light intensity, modify the first pulse width modulation signal by increasing the intensity of the peak current and keeping the duty cycle constant, so that the electric current modulated by the second pulse width modulation signal has a higher average intensity compared to the electric current modulated by the first pulse width modulation signal.
    The measurement step may preferably include the step of measuring the light intensity of the light emitted by the powered light source, and the modification step may further comprise the following step:
    if the light intensity is higher than the reference light intensity, modify the first pulse width modulation signal by decreasing the intensity of the peak current and keeping the duty cycle constant, so that the the electric current modulated by the second pulse width modulation signal has a lower average intensity compared to the electric current modulated by the first pulse width modulation signal.
    Preferably, the measurement step can include the step of measuring the light intensity of the light emitted by the powered light source, and the modification step can also include the following step:
    if the light intensity is lower than the reference light intensity, modify the first pulse width modulation signal by keeping the intensity of the peak current constant and increasing the duty cycle, so that the electric current modulated by the second pulse width modulation signal has a higher average intensity compared to the electric current modulated by the first pulse width modulation signal.
    The measurement step can preferably comprise the step of measuring the light intensity of the light emitted by the light source supplied, and the modification step can also comprise the following step:
    if the light intensity is higher than the reference light intensity, modify the first pulse width modulation signal by keeping the intensity of the peak current constant and decreasing the duty cycle, so that the the electric current modulated by the second pulse width modulation signal has a lower average intensity compared to the electric current modulated by the first pulse width modulation signal.
    Preferably, the comparison means can comprise a comparator circuit configured to generate a signal representative of the difference of the two compared values.
    The control means may preferably include a microcontroller element configured to modify the first pulse width modulation signal as a function of a signal received by the comparison means.
    Preferably, the source of electric current may comprise means for controlling the electrical supply of the light source.
    The elementary light source or sources may preferably be light-emitting diodes, LEDs.
    Preferably, the elementary sources can be light-emitting semiconductor elements with submillimetric dimensions, epitaxial in the form of a matrix on a substrate of a light component.
    Epitaxy is a crystal-oriented growth technique commonly used to create semiconductor junctions.
    The steps of the method according to the invention can preferably be applied to each of the elementary sources of the light component, or alternatively to some of the elementary sources of the light component.
    Preferably, the steps of measurement, comparison and modification can be carried out during the production of a light device for a motor vehicle equipped with the elementary light sources, the parameters of the second pulse width modulation signal being recorded. in a memory element of the device, for each of the elementary light sources.
    The steps of measurement, comparison and modification can preferably be carried out during the operation of a light device for a motor vehicle equipped with elementary light sources, the second pulse width modulation signal being applied to control the power supply. electric light elementary sources.
    The invention also relates to a device for calibrating the intensity of an electric current supplying a plurality of elementary light sources of a light module for a motor vehicle. The device is remarkable in that it includes:
    a source of electric current to power the light sources;
    means for measuring the light intensity or the wavelength of the light emitted by the light sources supplied;
    means for comparing two values of light intensities or two wavelengths;
    control means for controlling the source of electric current; the components of the device being configured so as to carry out the steps of the process according to the invention.
    Preferably, the measurement means can comprise an image sensor.
    The invention also relates to a device for controlling the electrical supply of a plurality of elementary light sources of a light module for a motor vehicle. The device is configured to supply an electric current modulated by a pulse width modulation signal specific to each of the elementary light sources. The parameters of said pulse width modulation signals are obtained using the method according to the invention.
    Using the measurements according to the present invention, it becomes possible to calibrate the light-emitting elementary sources of a matrix of light sources so that the light emitted by all the sources of a matrix is of a color and a substantially uniform light intensity. This is particularly interesting in the context of monolithic matrix components, in which the light-emitting junctions are epitaxied on a common substrate. The light-emitting semiconductor junctions are therefore not replaceable. The electrical and optical characterization of each junction and therefore of each elementary source of such a light component can only be carried out after the production of the component. The invention makes it possible to determine, for each elementary source of such a matrix, the intensity of the peak current and the duty cycle of a pulse width modulation signal to be applied to the electric current which supplies the component. The application of the modulation signals thus determined makes it possible to obtain the uniform emission desired among all the elementary electroluminescent sources of such a matrix component. This makes it possible to use matrix components otherwise declared as being defective due to their light non-uniformity. The invention therefore makes it possible indirectly to reduce the production costs of such components by servicing a plurality of otherwise unusable components. Obviously, the field of application of the calibration method according to the invention is not limited to monolithic matrix components, nor moreover to matrices of LED components, but also applies to devices involving a plurality of, or even only one, LED.
    Other characteristics and advantages of the present invention will be better understood with the aid of the exemplary description and of the drawings among which:
    Figure 1 shows an example of a pulse width modulation signal known in the art;
    Figure 2 shows schematically the main steps of a preferred embodiment of the method according to the invention;
    Figure 3 shows schematically a device according to a preferred embodiment of the invention.
    Unless otherwise specified, technical characteristics described in detail for a given embodiment can be combined with technical characteristics described in the context of other embodiments described by way of example and not limitation.
    In the present description, abstraction will be made of components well known in the field of electric power supply of LED type light sources, in order to focus the presentation on the key elements of the invention. In fact, it is known to use means for controlling the power supply of LED sources in a motor vehicle. These means generally involve converter elements capable of converting a direct current of a first intensity, generally supplied by a current source internal to the vehicle, such as a battery, into a charging current of a second intensity, capable of supply the connected LED or LEDs in charge of said control means.
    Figure 1 shows a pulse width modulation (PWM) signal known in the art. Such a signal is characterized by a peak intensity and a duty cycle, calculated by time period. In the example shown, the duty cycle over the single period shown is 50%. The PWM signal therefore supplies during the period shown a current with an average intensity AVG equal to half the intensity of the peak current. It goes without saying that the average intensity can be varied either by modifying the intensity of the peak current while keeping the duty cycle constant, or by modifying the duty cycle by keeping the intensity of the peak current constant, or by modifying the intensity of the peak current and the duty cycle.
    The invention is generally based on two observations. On the one hand, for electroluminescent light sources with a semiconductor element, the temperature, or equivalently the color of the light, largely depends on the intensity of the peak current. The higher the peak current, the more the generally white light emitted by an electroluminescent light source is shifted towards the blue part of the light spectrum. The lower the peak current, the more the generally white light emitted by the electroluminescent light source is shifted towards the yellow part of the light spectrum.
    On the other hand, the light intensity of the light emitted by an electroluminescent light source depends largely on the average of the electric current which powers it. The higher the current, the higher the luminance. Conversely, the lower the average current intensity, the lower the luminance of the source.
    The main steps 10-40 of the method according to the invention are illustrated in FIG. 2, while FIG. 3 shows the different components of a device 100 according to the invention, allowing the implementation of the method.
    At least one elementary light source with a semiconductor element 120 is supplied with the aid of an electric current source 110. The elementary light source can be a light-emitting diode or an elementary source epitaxially grown on a substrate, forming an integral part of a matrix monolithic component having a plurality of such sources. The cabling necessary to selectively and independently supply the plurality of such sources is not shown and does not fall within the scope of the present invention. Advantageously, the method can be applied independently to each of the elementary sources of such a matrix.
    During a first step 10, an electric supply current of a predetermined nominal intensity is supplied to the light source 120. The electric current has an average intensity and is modulated using a first modulation modulation signal. pulse width, PWM.
    During a second step 20, the light intensity or the color of the light emitted by the light source 130 supplied is measured using measurement means 130. The measurement means can for example comprise an image sensor , a camera, or other photosensitive elements capable of measuring either the light intensity or the color of an incident light. The color of the light can be expressed either in terms of temperature in degrees Kelvin, or in chromatic coordinates, or in terms of wavelengths.
    During a third step 30, the value thus measured is compared with a predetermined reference value using comparison means 140. The reference value preferably characterizes white light with a light intensity in accordance with the light function that source 120 will have to accomplish. The comparison means ίο can comprise an analog comparison circuit or else a microcontroller programmed for this purpose.
    During a fourth step 40, control means 150 generally involving a microcontroller element, control the electric current source 110 to supply the light source 120 by means of a second PWM signal whose characteristics differ from the initial PWM signal, if the values compared do not match substantially. The parameters of the second PWM signal are determined from the parameters of the first PWM signal by the control means 150. The parameters are determined so that the light emitted by the light source 120 has a measured light intensity value or a measured color which are closer to the respective reference values, when the light source is supplied by an electric current modulated using the second pulse width modulation signal, relative to the supply of the light source by means of the electric current modulated using the first PWM signal.
    The electric current source 110 can preferably and in a nonlimiting manner include means for controlling the electric supply of the elementary light source 120, in particular when the method is implemented in an assembled and functional light device for a motor vehicle.
    According to a preferred embodiment, the measurement means 130 are able to measure the color of the light emitted by the elementary light source 120. The measured value is compared with a reference white color. If the color measured corresponds to a more yellow color than the reference color, the first PWM pulse width modulation signal is modified by increasing the intensity of the peak current and decreasing the duty cycle. In this way, the electric current modulated by the first pulse width modulation signal and the electric current modulated by the second pulse width modulation signal have substantially equal average intensities. The brightness of the source 120 is therefore not substantially modified, while the color of the light emitted by it is seen close to the reference white color. The exact value of the peak current intensity of the second PWM signal depends on the intrinsic characteristics of the light-emitting source 120 and can be determined according to the specific application of the method. Once the value of the peak current intensity of the second PWM signal has been set, the duty cycle is adjusted in order to maintain an average current intensity substantially equal to that of the first PWM signal.
    If, on the other hand, the color measured corresponds to a more blue color than the reference color, the first pulse width modulation signal PWM is modified by decreasing the intensity of the peak current and by increasing the duty cycle, so that the electric current modulated by the first pulse width modulation signal and the electric current modulated by the second pulse width modulation signal have substantially equal average intensities. Analogously to the above this implies that the brightness of the source 120 is not substantially affected, while the color of the light emitted by it is seen close to the reference white color.
    According to another preferred embodiment of the invention, the measurement means 130 are able to measure the light intensity of the light emitted by the elementary light source 120. The measured value is then compared using the comparison means 140 to a reference light intensity value. If the light intensity is lower than the reference light intensity, the first pulse width modulation signal is modified by increasing the intensity of the peak current and keeping the duty cycle constant. In this way, the electric current modulated by the second pulse width modulation signal has a higher average intensity compared to the electric current modulated by the first pulse width modulation signal. This increases the brightness of the light emitted by the source 120. The exact value of the peak current of the second PWM signal is determined as a function of the intrinsic characteristics of the source 120 and of the predetermined reference value to be obtained. Alternatively, the intensity of the peak current can be kept constant by increasing the duty cycle of the second PWM signal. This also results in an increase in the average intensity of the electric current compared to the first PWM signal.
    If, on the other hand, the measured light intensity is higher than the reference light intensity, the first pulse width modulation signal is modified by decreasing the intensity of the peak current and keeping the duty cycle constant. In this way, the electric current modulated by the second pulse width modulation signal has a lower average intensity compared to the electric current modulated by the first pulse width modulation signal. This decreases the brightness of the light emitted by the source 120. The exact value of the peak current of the second PWM signal is determined as a function of the intrinsic characteristics of the source 120 and of the predetermined reference value to be obtained. Alternatively, the intensity of the peak current can be kept constant by decreasing the duty cycle of the second PWM signal. This also results in a decrease in the average intensity of the electric current compared to the first PWM signal.
    For all of the embodiments which have just been described, the method according to the invention can advantageously be carried out during the manufacture or assembly of a light module which is equipped with a matrix component which involves elementary sources 120. In this case, a nominal current is first used to supply each source during step 10. The parameters of the second PWM signal, determined during step 40 of the method, are then recorded for each of the sources in a memory element provided for this purpose in the light module. When the module is operating in a light vehicle, this information can be read and recovered by suitable reading means. The control means 150 then use the parameters thus recovered in order to control the electrical supply of the sources 120 in question, which results in a uniform light emission among all the elementary sources of the matrix.
    Alternatively, calibration can be performed during the operation of the light module in a motor vehicle. A light sensor is then used to measure the color and / or the luminosity emitted by each of the elementary sources 120. If a deviation from the predetermined reference values is detected by the comparison means 140, the control means 150 adapt the PWM signal for the light sources 120 in question in the manner which has just been described above. Thus deviations in the intensity or the color emitted along the life cycle of a matrix light component can also be addressed, thus guaranteeing the emission of uniform light among all the elementary sources of the matrix over time.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    Claims
    1. Method for calibrating the intensity of an electric current for supplying at least one elementary light source with a semiconductor element (120), characterized in that it comprises the following steps:
    using an electric current source (110), supplying an electric supply current to the light source (120), the electric current having an average intensity and being modulated using a first signal pulse width modulation, the signal being characterized by an intensity of the peak current and a duty cycle (10);
    measuring, using measuring means (130), the light intensity or the color of the light emitted by the powered light source (20); using comparison means (140), comparing the measured value with a predetermined light intensity value or with a predetermined color serving as a reference (30);
    using control means (150) of the electric current source (110), modify the value of the intensity of the peak current and / or the duty cycle of the first pulse width modulation signal to obtain a second pulse width modulation signal if the compared values do not substantially match (40);
    so that the light emitted by the light source has a measured light intensity value or a measured color which are closer to the respective reference values, when the light source is supplied by an electric current modulated using the second pulse width modulation signal.
    [2" id="c-fr-0002]
    2. Method according to claim 1, characterized in that the measurement step (20) comprises the step of measuring the color of the light emitted by the light source supplied, and in that the modification step (40) further includes the following step, the reference color corresponding to white light:
    if the color measured corresponds to a more yellow color than the reference color, modify the first pulse width modulation signal by increasing the intensity of the peak current and by decreasing the duty cycle, so that the current The electric current modulated by the first pulse width modulation signal and the electric current modulated by the second pulse width modulation signal have substantially equal average intensities.
    Method according to claim 1, characterized in that the measuring step (20) comprises the step of measuring the color of the light emitted by the light source supplied, and in that the modifying step (40) comprises in addition to the following step, the reference color corresponding to white light:
    if the color measured corresponds to a bluer color than the reference color, modify the first pulse width modulation signal by decreasing the intensity of the peak current and increasing the duty cycle, so that the current The electric current modulated by the first pulse width modulation signal and the electric current modulated by the second pulse width modulation signal have substantially equal average intensities.
    Method according to claim 1, characterized in that the measuring step (20) comprises the step of measuring the light intensity of the light emitted by the light source supplied, and in that the modifying step (40) further includes the following step:
    if the light intensity is lower than the reference light intensity, modify the first pulse width modulation signal by increasing the intensity of the peak current and keeping the duty cycle constant, so that the electric current modulated by the second pulse width modulation signal has a higher average intensity compared to the electric current modulated by the first pulse width modulation signal.
    Method according to claim 1, characterized in that the measuring step (20) comprises the step of measuring the light intensity of the light emitted by the light source supplied, and in that the modifying step (40) further includes the following step:
    if the light intensity is higher than the reference light intensity, modify the first pulse width modulation signal by decreasing the intensity of the peak current and keeping the duty cycle constant, so that the the electric current modulated by the second pulse width modulation signal has a lower average intensity compared to the electric current modulated by the first pulse width modulation signal.
    Method according to claim 1, characterized in that the measuring step (20) comprises the step of measuring the light intensity of the light emitted by the light source supplied, and in that the modifying step (40) further includes the following step:
    if the light intensity is lower than the reference light intensity, modify the first pulse width modulation signal by keeping the intensity of the peak current constant and increasing the duty cycle, so that the electric current modulated by the second pulse width modulation signal has a higher average intensity compared to the electric current modulated by the first pulse width modulation signal.
    Method according to claim 1, characterized in that the measuring step (20) comprises the step of measuring the light intensity of the light emitted by the light source supplied, and in that the modifying step (40) further includes the following step:
    if the light intensity is higher than the reference light intensity, modify the first pulse width modulation signal by keeping the intensity of the peak current constant and decreasing the duty cycle, so that the the electric current modulated by the second pulse width modulation signal has a lower average intensity compared to the electric current modulated by the first pulse width modulation signal.
    Method according to one of claims 1 to 7, characterized in that the comparison means comprise a comparator circuit configured to generate a signal representative of the difference of the two compared values.
    Method according to one of claims 1 to 8, characterized in that the control means comprise a microcontroller element configured to modify the first pulse width modulation signal as a function of a signal received by the comparison means.
    10. Method according to one of claims 1 to 10, characterized in that the electric current source (110) comprises means for controlling the electrical supply of the light source (120).
    [3" id="c-fr-0003]
    5 11. Method according to one of claims 1 to 10, characterized in that the elementary light source or sources are light-emitting diodes, LEDs.
    12. Method according to one of claims 1 to 11, characterized in that the elementary sources are electroluminescent semiconductor elements with dimensions
    [4" id="c-fr-0004]
    10 submillimeters, epitaxial in the form of a matrix on a substrate of a light component.
    [5" id="c-fr-0005]
    13. Method according to claim 12, characterized in that the steps (10) - (40) are applied to each of the elementary sources of the light component.
    [6" id="c-fr-0006]
    14. Method according to one of claims 1 to 13, characterized in that the steps of measurement (20), comparison (30) and modification (40) are carried out during the production of a light device for a motor vehicle equipped elementary light sources, the parameters of the second modulation signal of
    20 pulse width being recorded in a memory element of the device, for each of the elementary light sources.
    [7" id="c-fr-0007]
    15. Method according to one of claims 1 to 12, characterized in that the steps of measurement (20), comparison (30) and modification (40) are carried out during the
    25 operation of a light device for a motor vehicle equipped with elementary light sources, the second pulse width modulation signal being applied to control the electrical supply of the elementary light sources.
    30
    [8" id="c-fr-0008]
    16. Device (100) for calibrating the intensity of an electric supply current (100) of a plurality of elementary light sources (120) of a light module for a motor vehicle, characterized in that the device includes:
    a source of electric current (110) for supplying the light sources (120);
    35 - means for measuring (130) the light intensity or the wavelength of the light emitted by the light sources supplied;
    means for comparing (140) two values of light intensities or two wavelengths;
    control means (150) for controlling the source of electric current (110);
    5 the components (110, 130, 140, 150) of the device being configured so as to carry out the steps of the method according to one of claims 1 to 15.
    [9" id="c-fr-0009]
    17. Device according to claim 16, characterized in that the measuring means comprise an image sensor.
    [10" id="c-fr-0010]
    18. Device for controlling the electrical supply of a plurality of elementary light sources (120) of a light module for a motor vehicle, characterized in that the device is configured to supply an electric current modulated by a modulation signal pulse width specific to each of
    15 elementary light sources, and in that the parameters of said pulse width modulation signals are obtained using the method according to one of claims 1 to 15.
    1/1
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    FR3058569A1|2018-05-11|AUTOMATED CALIBRATION OF A LIGHT MODULE
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    同族专利:
    公开号 | 公开日
    FR3056071B1|2020-11-13|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20140327361A1|2009-04-24|2014-11-06|Photonstar Led Limited|High colour quality luminaire|
    US20120049745A1|2010-09-01|2012-03-01|Osram Sylvania Inc.|Led control using modulation frequency detection techniques|CN108957103A|2018-05-22|2018-12-07|梧州学院|A method of the high precision peak detection for the small signal of high bandwidth|
    WO2021064063A1|2019-10-04|2021-04-08|Valeo Vision|Method for controlling a lighting device for emitting a pixelated light beam|
    EP3813490A1|2019-10-21|2021-04-28|B/E Aerospace, Inc.|Light source calibration and aging compensation system|
    法律状态:
    2017-09-29| PLFP| Fee payment|Year of fee payment: 2 |
    2018-03-16| PLSC| Publication of the preliminary search report|Effective date: 20180316 |
    2018-09-28| PLFP| Fee payment|Year of fee payment: 3 |
    2019-09-30| PLFP| Fee payment|Year of fee payment: 4 |
    2020-09-30| PLFP| Fee payment|Year of fee payment: 5 |
    2021-09-30| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1658657|2016-09-15|
    FR1658657A|FR3056071B1|2016-09-15|2016-09-15|PROCESS FOR CALIBRATION OF THE INTENSITY OF AN ELECTRIC CURRENT SUPPLYING ELECTROLUMINESCENT LIGHT SOURCES TO OBTAIN A UNIFORM LIGHT|FR1658657A| FR3056071B1|2016-09-15|2016-09-15|PROCESS FOR CALIBRATION OF THE INTENSITY OF AN ELECTRIC CURRENT SUPPLYING ELECTROLUMINESCENT LIGHT SOURCES TO OBTAIN A UNIFORM LIGHT|
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