• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    The invention relates to a method of calibrating a light module comprising a set of electroluminescent elements, said method comprising: - supplying (601) the electroluminescent elements so as to obtain an image projected by the light module, the projected image comprising a set of pixels, each pixel corresponding to at least a subset of at least one electroluminescent element of the light source; for each pixel of the projected image, comparing (603) a difference between a luminous intensity of the pixel with a predefined luminous intensity of a corresponding pixel of a reference image, with a threshold; in the case where the difference is greater than the predetermined threshold, determining (605) a modified supply value of at least a first electroluminescent element of the subset corresponding to the given pixel; storage (607), in a memory of the light module, of the modified power supply value in association with an identifier of the subassembly comprising the first electroluminescent element.
    公开号:FR3076171A1
    申请号:FR1763077
    申请日:2017-12-22
    公开日:2019-06-28
    发明作者:Pierre Albou；Vincent Godbillon
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    Calibration of a light module with electroluminescent elements
    The present application relates to the calibration of a light module comprising a light source, for a motor vehicle capable of emitting a beam of light rays along a longitudinal axis.
    By light module is meant any device capable of emitting light, in particular for lighting and / or signaling and / or interior lighting in the motor vehicle.
    Such a light module incorporates for this purpose a light source. The light sources used for lighting and signaling in motor vehicles are more and more frequently constituted by light-emitting diodes, in particular for advantages of space and autonomy compared to conventional light sources. The use of light-emitting diodes in lighting and / or signaling modules has also enabled market players (automobile manufacturer and designer of lighting and / or signaling devices) to bring a creative touch to the design of these devices, in particular for the use of an ever greater number of these light-emitting diodes to achieve optical effects.
    Light modules are known, for example, comprising an imager capable of spatially modulating the light intensity of a light beam coming from a light source.
    An example of such a light module is illustrated with reference to Figure 1.
    The light module 1 comprises a light source 100, such as a light-emitting diode source or a laser diode source capable of emitting a light beam 108. The light source 100 can be controlled by a control module 102, also called a "driver" .
    The light beam 108 is collimated by a collimation unit 101, which may include one or more lenses.
    The beam 108 is thus collimated towards an imager 103 which spatially modulates the light intensity of the beam and directs the modulated beam towards a projection unit 104. The projection unit 104 can comprise lenses and a reflector and is able to project the light beam towards the outside of the motor vehicle, in order to perform a light function.
    In such a light module comprising several units performing respective functions, manufacturing or mounting faults are likely to impact the homogeneity of the beam. For example, when the light module is designed to obtain a reference image on a screen 105, certain pixels of the image obtained by projection of the light beam 108 may, in practice, differ from corresponding pixels of the reference image. The reference image can for example be a homogeneous white rectangle in which all the pixels have the same light intensity. The image obtained by a light module 1 having a defect may however appear on the screen 205 as illustrated with reference to FIG. 2.
    In FIG. 2, the image 201 obtained by projection on the screen comprises dark areas 202, and the image 201 thus differs from the homogeneous reference image.
    Such defects can be caused by: - the optics of the collimation and projection units 101 and 104. In this case, and as illustrated in FIG. 2, a vignetting effect can appear on the projected image 201; - A defect in the light source 100 causing a light beam 108 that is inhomogeneous from the start; - a defect in the imager 103, in particular a defect in the transmission or reflection coefficient, global or local, of the imager 103 - a manufacturing tolerance for the elements of the light module, this tolerance possibly having an impact on the size or the shape of said modules elements, - a faulty positioning of the elements of the light module with each other during their assembly.
    There is thus a need to correct or compensate for manufacturing or assembly defects in a light module. Such a need is in no way specific to the light module 1 illustrated in FIG. 2 and applies to any light module.
    A first aspect of the invention relates to a method for calibrating a light module comprising a light source comprising a set of electroluminescent elements arranged on the same substrate, the method comprising the following steps: - supplying all of the electroluminescent elements with so as to obtain an image projected by the light module, the projected image comprising a set of pixels, each pixel corresponding to at least one subset of at least one electroluminescent element of the light source, each subset being capable of be supplied with current individually; - for each pixel of the projected image, comparison of a difference between a light intensity of the pixel with a predefined light intensity of a corresponding pixel of a reference image, with a predetermined threshold; - in the case where, for at least one given pixel of the projected image, the difference is greater than the predetermined threshold, determination of a modified supply value of at least one first electroluminescent element of the subset corresponding to the pixel given; - storage, in a memory of the light module, of the modified supply value in association with an identifier of the sub-assembly comprising the first electroluminescent element. The use of a light source with electroluminescent elements grouped into individually addressable sub-assemblies and corresponding to pixels of the projected image, makes it possible to correct defects in the light module, defects which are inevitable during manufacture or during the 'assembly. In addition, such a correction or calibration is carried out without requiring modifications to the optical elements of the light module: the correction is based on the storage of modified power supply values for at least some of the subsets of electroluminescent elements. The electroluminescent elements are capable by nature of accepting a power supply different from a nominal value and, thus, the calibration does not induce degradation of the light source.
    In one embodiment, the method can further comprise a step of warming up the light module to a given temperature value, and, during the storage step, the modified power value can be stored in association with an identifier of the sub-assembly comprising the first electroluminescent element and with the given temperature value.
    Indeed, the operating ranges of electroluminescent elements strongly depend on the surrounding temperature. It is thus particularly advantageous to store the modified supply value in association with the temperature value for which it is calculated.
    In addition, the process steps can be iterated, and, at each iteration, the light module can be brought to temperature at a temperature value different from the temperature value of the previous iteration.
    Thus, the accuracy of the calibration is improved and the images projected by the light module are close to the reference image regardless of the temperature surrounding the light module.
    Finally, the method can be applied for several values of pixel power supply. The correction can then be made for a temperature at a given supply value, or by interpolation between the stored values of these different parameters.
    A second aspect of the invention relates to a computer program comprising instructions for implementing the steps of the method according to the first aspect of the invention, when these instructions are executed by a processor.
    A third aspect of the invention relates to a system for calibrating a light module comprising a light source comprising a set of electroluminescent elements arranged on the same substrate, the system comprising: - a control unit for controlling the supply of power to the set of electroluminescent elements so as to obtain an image projected by the light module on a screen of said system, the projected image comprising a set of pixels, each pixel corresponding to at least a subset of at least one electroluminescent element of the light source, each sub-assembly being able to be supplied with current individually; - a camera adapted to acquire images of the image projected on the screen; - a processor for, for each pixel of the projected image, comparing a difference between a light intensity of said pixel with a predefined light intensity of a pixel corresponding to a reference image, with a predetermined threshold.
    The processor can be further adapted for, in the case where, for at least one given pixel of the projected image, the difference is greater than the predetermined threshold, determining a modified supply value of at least one first electroluminescent element of the sub-assembly corresponding to the pixel given for the purpose of storing the modified supply value in association with an identifier of the sub-assembly comprising the first electroluminescent element in a memory of the light module.
    A fourth aspect of the invention relates to a light module comprising: - at least one light source comprising a set of light emitting elements arranged on the same substrate, said set of light emitting elements comprising subsets of at least one light emitting element , each sub-assembly being able to be supplied with current individually; - a memory storing power supply values in association with identifiers of subsets of electroluminescent elements; - a control unit capable of supplying the subassemblies of the light-emitting source as a function of the associated supply values; in which, on receipt of a modified supply value in association with a given identifier of a subset of electroluminescent elements, the memory is able to store the modified supply value in association with the given identifier of the sub-assembly, and in which the control unit supplies the identified sub-assembly according to the modified supply value.
    According to one embodiment, the light module may further comprise a temperature sensor capable of measuring a current temperature value, in particular a current temperature value near the light source, in particular on the light source, and, on reception of a modified supply value in association with a given identifier of a subset of electroluminescent elements and with a given temperature value, the memory is able to store the modified supply value in association with the identifier given from the subset and with the given temperature value. If an identifier of a subset is associated with several modified supply values and respective temperature values, the control module is able to select the modified supply value associated with the temperature value closest to the value current temperature. Alternatively, the control module is able to calculate an interpolation of the supply value as a function of the supply values corresponding to a lower temperature, in particular the immediately lower temperature, and to a higher temperature, in particular the temperature immediately above the value current temperature.
    Thus, the defects of the light module are compensated with precision whatever the surrounding temperature.
    In addition, the light module can further comprise a focusing unit capable of focusing a light beam coming from the light source, an imager capable of spatially modulating the light intensity of the focused beam, and a projection unit capable of projecting the light beam modulated towards the outside of the light module.
    In addition, the imager can be a matrix of micro-mirrors
    According to one embodiment of the invention, the electroluminescent elements can be electroluminescent sticks of submillimetric dimension or electroluminescent studs. The use of sticks or electroluminescent studs of submillimetric dimension makes it possible to improve the accuracy of the correction, due to their small size. Other characteristics and advantages of the invention will appear on examining the detailed description below, and the attached drawings in which: FIG. 1 illustrates a light module according to the prior art; FIG. 2 illustrates an image projected on a screen by a light module according to the prior art, comprising defects; FIG. 3 illustrates a system for calibrating a light module according to an embodiment of the invention; FIG. 4 illustrates a light source of a light module according to one embodiment; Figure 5 is a sectional view of a light source of a light module according to one embodiment; FIG. 6 is a diagram illustrating the steps of a method according to an embodiment of the invention.
    FIG. 3 illustrates a system for calibrating a light module 2 according to an embodiment of the invention. By way of illustration, a light module 2 is shown whose structure is close to that of the light module 1 in FIG. 1: the light module 2 comprises a light source 100, a collimation unit 101, a control unit 102, a imager 103 and a projection unit 104. The common elements between the light module 2 and the light module 1 are therefore identified by common references. The invention proposes to calibrate the light module 2, in which the light source 100 is a light source comprising a plurality of electroluminescent elements arranged on the same substrate. The electroluminescent elements are divided into subsets of at least one electroluminescent element, each subset being individually addressable. According to certain embodiments, a sub-assembly includes several individually controllable light-emitting elements. It will thus be understood that the invention applies to any light module comprising a source comprising a plurality of electroluminescent elements, regardless of the optical system making it possible to project a light beam outside the light module 2.
    As will be better understood on reading the following, the use of such a light source makes possible precise calibration and makes it possible to compensate for manufacturing and assembly defects at a lower cost. The imager 103 can be an array of DMD type micro-mirrors, for “DigitalMicromirror Device” in English, a transparent or reflective LCD module or an L-COS module, for “Liquid Crystal On Silicon”.
    The light source 100, and in particular each of the subsets of electroluminescent elements, is controlled by the control unit 102, which is also connected to a memory 106 according to the invention. The light module 2 can also include an interface 107 capable of exchanging data with a calibration module 109.
    Such an interface 107 is optional according to the invention since the calibration method can provide that the calibration module 109 directly accesses the memory 106 of the light module 2.
    The light module 2 can also include a temperature sensor 108 capable of measuring a current and ambient temperature value.
    The calibration module 9 can comprise an interface 111 and a processor 110, able to be connected to a camera 112 placed in front of the screen 105. In one embodiment, the camera 112 is integrated in the calibration module 109.
    FIG. 4 illustrates a set 15 of electroluminescent elements according to an embodiment of the invention.
    In FIG. 4, by way of example, the light-emitting elements are light-emitting sticks 8 of submillimetric dimensions, which will hereinafter be called light-emitting sticks. These light-emitting sticks 8 originate on the same substrate 10. Each light-emitting stick 8, here formed by the use of gallium nitride GaN, extends perpendicularly, or substantially perpendicularly, projecting from the substrate 10, here made from silicon, d 'Other materials such as silicon carbide can be used for the substrate without departing from the context of the invention. By way of example, the light-emitting sticks 8 could be produced from a compound based on aluminum nitride and gallium nitride AIN / GaN, or from a compound based on aluminum, indium and gallium AIN / GaN / InGaN.
    In FIG. 2, the substrate 10 has a lower face 12, to which a first electrode 14 is attached, and an upper face 16, projecting from which extend the light-emitting rods 8 and to which a second electrode 18 is attached. Note that a single subset of light-emitting sticks 8 is shown in FIG. 4. However, as explained above, the set of light-emitting elements can comprise several subsets of at least one light-emitting element. In this case, one or more electrodes 14 and 18 can be dedicated to the same sub-assembly, so that each sub-assembly can be supplied individually, that is to say independently of the other sub-assemblies.
    Different layers of material are superimposed on the upper face 16, in particular after the growth of the light-emitting sticks from the substrate here.
    Among these different layers, there can be found at least one layer of electrically conductive material, in order to allow the electrical supply of the light-emitting sticks 8. This layer is etched so as to connect the sticks of each individually addressable subset of the first set 2 of the light source 6 between them.
    The light-emitting rods 8 of submillimetric dimensions stretch from the substrate 10 and comprise, as can be seen in FIG. 2, each a core 19 of gallium nitride, around which quantum wells 20 are arranged formed by a radial superposition of layers of different materials, here gallium nitride and gallium-indium nitride, and a shell 21 surrounding the quantum wells also made of gallium nitride.
    Each rod extends along a longitudinal axis 22 defining its height, the base 23 of each rod being arranged in a plane 24 of the upper face 16 of the substrate 10.
    The light-emitting sticks 8 advantageously have the same shape. These light-emitting rods 8 are each delimited by an end face 26 and by a circumferential wall 28 which extends along the longitudinal axis. When the light-emitting rods 8 are doped and are the subject of a polarization, the resulting light at the output of the light source 100 is emitted mainly from the circumferential wall 28, it being understood that it is possible to provide that light rays also come out, at least in small quantities, from the end face 26. It follows that each light-emitting stick 8 acts as a single light-emitting diode and that the density of the light-emitting sticks 8 improves the luminance of the light source 100.
    The circumferential wall 28 of an electroluminescent rod 8, corresponding to the gallium nitride shell, is covered by a layer of transparent conductive oxide TCO 29 which forms the anode of each rod complementary to the cathode formed by the substrate.
    This circumferential wall 28 extends along the longitudinal axis 22 from the substrate 10 to the end face 26, the distance from the end face 26 to the upper face 16 of the substrate, from which the light-emitting rods 8 arise. , defining the height of each electroluminescent stick 8. By way of example, it is possible to provide that the height of an electroluminescent stick 8 is between 1 and 10 micrometers, while it can be provided that the largest transverse dimension of the end face, perpendicular to the longitudinal axis 22 of the electroluminescent rod concerned, is less than 2 micrometers.
    It is also possible to define the surface of an electroluminescent rod 8, in a cutting plane perpendicular to this longitudinal axis 22, within a determined range of values, and in particular between 1.96 and 4 square micrometers.
    These dimensions, given by way of nonlimiting example, make it possible to distinguish a light source 100 comprising light-emitting sticks from a light source with planar light-emitting diodes. The invention however also covers the case in which the light-emitting rods 8 of the light source 100 are planar light-emitting diodes. It thus applies to any light source 100 comprising a plurality of electroluminescent elements.
    Other specific dimensions of the light source 100 according to the invention may also be provided, and in particular a dimension of the illuminating surface for example of at most 10 x 10 mm2. The density of the light-emitting sticks 8 and the surface area of the illuminating surface can also be calculated so that the luminance obtained by the plurality of light-emitting sticks is for example at least 60 Cd / mm2. The optimal dimension of the illuminating surface of the light source 100 will depend on the intended function.
    The height of the light-emitting sticks 8 can also be modified within the light source 100, so that certain light-emitting sticks can have a height different from other light-emitting sticks.
    The shape of the light-emitting sticks 8 may also vary, in particular on the section of the sticks and on the shape of the end face 26. It has been illustrated, in FIG. 4, light-emitting sticks having a generally cylindrical shape, and in particular of polygonal section , here more particularly hexagonal. We understand that it is important that light can be emitted through the circumferential wall, whether it has a polygonal or circular shape for example.
    Furthermore, the end face 26 may have a substantially planar shape and perpendicular to the circumferential wall, so that it extends substantially parallel to the upper face 16 of the substrate 10, as illustrated in FIG. 4, or although it may have a domed or pointed shape at its center, so as to multiply the directions of emission of the light leaving this terminal face, as illustrated in FIG. 5.
    In FIG. 4, the light-emitting sticks 8 are arranged in a two-dimensional matrix constituting a sub-assembly. Such a subset can for example correspond to a pixel of the projected image, and the light source 100 can thus comprise several subsets corresponding to respective pixels. A sub-assembly comprises at least one electroluminescent stick 8.
    This arrangement could be such that the light-emitting sticks are staggered. The invention covers other distributions of rods, in particular with rod densities which can be variable from one subset to another.
    The light source 100 may further comprise, as illustrated in FIG. 5, a layer 30 of a polymeric material in which light-emitting sticks 8 are at least partially embedded. The layer 30 can thus extend over the entire extent of the substrate or only around one pixel only.
    The polymer material, which may in particular be based on silicone, makes it possible to protect the light-emitting sticks 8 without hampering the diffusion of the light rays.
    It is generally possible to integrate in this layer 30 of polymer material wavelength conversion means, and for example phosphors, capable of absorbing at least part of the rays emitted by one of the light-emitting rods 8 and at converting at least part of said absorbed excitation light into emission light having a wavelength different from that of the excitation light.
    The light source 100 may further comprise a coating 32 of light-reflecting material, which is disposed between the light-emitting rods 8 to deflect the rays initially oriented towards the substrate 10, towards the end face 26 of the light-emitting rods 8. In other words In other words, the upper face 16 of the substrate 10 may include a reflecting means which returns the light rays, initially oriented towards the upper face 16, towards the exit face of the light source 100. This thus recovers rays which would otherwise be lost. This coating 32 is disposed between the light-emitting rods 8 on the transparent conductive oxide layer 29.
    FIG. 6 is a diagram illustrating the steps of a method for calibrating the light source 2, according to an embodiment of the invention. In an optional step 600, the light module 2 is brought to temperature at a given temperature value. The term “placing in temperature” is used to place the light module 2 in an environment at a temperature corresponding substantially to the given temperature value. The accuracy of warming up can be improved without adding additional sensors, by accessing the temperature sensed by the temperature sensor 108 of the light module 2. Alternatively, “warming up” can be carried out by switching on the light source during a duration allowing it to have a stabilized temperature. In a step 601, all of the electroluminescent elements of the light source 100 are supplied by the control circuit 102. In the example described below, and in order to clarify the description of the invention, all the sub- sets are supplied with the same current value. It will be understood, however, that depending on the light function to be performed, the subsets of electroluminescent elements can be supplied by respective currents. The order to supply the light source can come from a control unit not shown in FIG. 3. The control unit can be integrated into the light module 2 or, alternatively, can be integrated into the calibration module 109 which then sends an ignition order to the light module to trigger the supply of the light source 100 by the control unit 102.
    When the light source 2 is supplied, a projected image is obtained on the screen 105, such as the projected image illustrated in FIG. 2 for example. Each pixel of the projected image corresponds to at least a subset of electroluminescent elements. The image projected on the screen 105 is acquired in a step 602 by the camera 112, then transmitted to the processor 110 for processing. The image projected and acquired by the camera can be compared, pixel by pixel, with a reference image, in a step 603. As explained above, in the example considered, the reference image is a white image whose all pixels have equal light intensity.
    Thus, for a first pixel of the projected image, step 603 consists in comparing a difference between a light intensity of the first pixel and a light intensity of a corresponding pixel of a reference image, and a predetermined threshold. A pixel having substantially the same spatial coordinates in the reference image as the first pixel in the projected and acquired image is called the corresponding pixel. For this purpose, the projected and acquired image can be resized to be of a size and format comparable to the reference image.
    The predetermined threshold can correspond to a given number of candelas for example. The higher the predetermined threshold, the less the correction made by the calibration process. On the contrary, a predetermined threshold of low value makes it possible to obtain a projected image very close to the reference image. In a step 604, following the comparison step 603, it is checked whether the comparison is positive, that is to say if the difference obtained is greater than the predetermined threshold.
    If this is the case, the method continues to step 605. Otherwise, the method proceeds directly to step 606. In step 605, as a function of the difference between the light intensity of the first pixel and the intensity light of the corresponding pixel, the processor 110 can determine a modified power supply value of at least one first electroluminescent element of the subset corresponding to the first pixel.
    In the case where the calibration module 109 has access to the current values delivered by the control unit 102 of the light module 2, the modified supply value can be a current value, expressed in amperes. However, it is possible that the calibration module 109 does not have access to the values of the supply supplied by the control unit 102, in which case the modified supply value can be a multiplicative factor, which can then be applied to the control unit 102 for supplying the first electroluminescent element of the subset corresponding to the first pixel.
    For example, if the first pixel is brighter than the corresponding pixel in the reference image, the multiplying factor is less than 1 so as to reduce the current delivered to the first electroluminescent element of the subset, in the case where the first electroluminescent element is controllable in isolation from other electroluminescent elements of the same subset. Otherwise, the current delivered to the sub-assembly comprising the first element is reduced.
    In the case where the first pixel is less bright than the corresponding pixel in the reference image, the multiplying factor is greater than 1 so as to increase the current delivered to the first electroluminescent element of the subset, in the case where the first electroluminescent element is controllable in isolation from other electroluminescent elements of the same subset. Otherwise, the current delivered to the sub-assembly comprising the first element is increased. In a step 606, it is checked whether the comparison step 603 has been performed for all the pixels of the projected and acquired image. If this is the case, the method continues at step 607. Otherwise, steps 603 to 606 are repeated for a next pixel of the projected and acquired image.
    In order to allow an adaptation of the supply of some of the light-emitting elements of the light source 101, the modified supply value or values is stored in a step 607 in the memory 103 of the light module 2, in association with an identifier of the sub-assembly comprising the electroluminescent element for which the modified supply value has been determined. Note that the memory 103 can be an internal memory of the control unit 102. The identifier of the subset identifies, according to a first embodiment, the subset only. This embodiment makes it possible to deal with the case where the light-emitting elements of the same sub-assembly cannot be controlled individually and all receive the same power supply which is specific to the sub-assembly.
    As a variant, the identifier of the subset is supplemented by an identifier of the electroluminescent element to which the modified power value applies. This embodiment makes it possible to deal with the case where the electroluminescent elements of the same sub-assembly can be controlled individually. In this case, step 607 consists in storing the modified supply value in association with the identifier of the subset and with the identifier of the electroluminescent element for which the modified supply value has been determined.
    In the case where the temperature setting step 600 has been implemented, the step 607 may consist in storing the modified supply value in association with the identifier of the subset, possibly with the identifier of the the electroluminescent element, and also with the temperature value of the temperature setting step 600. The temperature value can either be taken from the temperature sensor 108 or be transmitted by the calibration unit 109.
    According to one embodiment, the method is iterated for different warm-ups at different temperature values, so as to advantageously obtain several calibrations of the light module at different temperatures. In this case, it is checked in step 608 if other temperature rises remain to be carried out. If this is the case, the method is iterated and returns to step 600 for a temperature setting at a temperature value different from that of précédente previous iteration. Otherwise, the calibration process is completed in step 609.
    To perform a calibration for different power supply levels, steps 601 to 607 are repeated for a given temperature by varying the power level in step 601.
    The storage of modified supply values in the light module 2 makes it possible to adapt the supply of the light-emitting elements to manufacturing and assembly faults of the light module 2, when the control unit 102 supplies the light-emitting elements as a function of the values or modified power supplies that are stored in memory 106.
    In the case where a subset of electroluminescent elements is stored in association with several modified supply values and respective temperature values, the control unit 102 can take into account a current temperature sensed by the temperature sensor 108 for select one of several modified power values. The control unit 102 can for example select the modified supply value associated with the temperature value closest to the current temperature.
    Thus, the present invention makes it possible to compensate for manufacturing and mounting defects, and more generally any defect in the light module, without requiring modification of the optical material of the light module 2. Such a calibration is in particular permitted by the use of a source comprising electroluminescent elements such as electroluminescent rods of submillimetric dimensions. In addition, such electroluminescent elements generally accept a supply different from a nominal supply value, which makes it possible to implement the invention.
    Another way of compensating for the defects of the light modulator would be, in the case of a light module 2 as illustrated in detail in FIG. 2, to modify the reflection coefficients of the matrix of micro-mirrors DMD 103, in order to '' increase the reflection coefficients, or ON / OFF ratio in the shaded areas of the projected image and decrease the reflection coefficients in the too bright areas of the projected image.
    However, such an alternative solution has the drawback of having to keep a margin in order to be able to increase the ON / OFF ratio. The DMD 103 micromirror array is therefore not used optimally and the beam obtained has a reduced overall intensity. The solution presented with reference to the figures described above has the advantage of not having such a drawback.
    Of course, the invention is not limited to the embodiments described above and provided only by way of example. It encompasses various modifications, alternative forms and other variants which a person skilled in the art may envisage within the framework of the present invention and in particular any combination of the various embodiments described above.
    权利要求:
    Claims (10)
    [1" id="c-fr-0001]
    1. Method for calibrating a light module (2) comprising a light source (100) comprising a set of electroluminescent elements (8) disposed on the same substrate (10), said method comprising the following steps: - supplying (601 ) all of the electroluminescent elements so as to obtain an image projected by the light module, the projected image comprising a set of pixels, each pixel corresponding to at least a subset of at least one electroluminescent element of the light source , each sub-assembly being able to be supplied with current individually; - for each pixel of the projected image, comparison (603) of a difference between a light intensity of said pixel with a predefined light intensity of a pixel corresponding to a reference image, with a predetermined threshold; - in the case where, for at least one given pixel of the projected image, the difference is greater than the predetermined threshold, determination (605) of a modified supply value of at least one first electroluminescent element of the subset corresponding to the given pixel; - Storage (607), in a memory (106) of the light module, of the modified supply value in association with an identifier of the sub-assembly comprising the first electroluminescent element.
    [2" id="c-fr-0002]
    2. Method according to claim 1, further comprising a step of warming up (600) the light module (2) to a given temperature value, in which, during the storage step (607), the value d the modified power supply is stored in association with an identifier of the sub-assembly comprising the first electroluminescent element and with the given temperature value.
    [3" id="c-fr-0003]
    3. Method according to claim 2, in which the steps of the method are iterated, and in which, on each iteration, the light module is brought to temperature at a temperature value different from the temperature value of the previous iteration.
    [4" id="c-fr-0004]
    4. Computer program comprising instructions for implementing the steps of the method according to one of claims 1 to 3, when these instructions are executed by a processor.
    [5" id="c-fr-0005]
    5. System for calibrating a light module comprising a light source comprising a set of electroluminescent elements arranged on the same substrate, said system comprising: - a control unit for controlling the supply of all the electroluminescent elements so obtaining an image projected by the light module on a screen of said system, the projected image comprising a set of pixels, each pixel corresponding to at least one subset of at least one electroluminescent element of the light source, each sub assembly being able to be supplied individually with current; - a camera (112) adapted to acquire images of the image projected on the screen; - a processor (110) for, for each pixel of the projected image, comparing a difference between a light intensity of said pixel with a predefined light intensity of a corresponding pixel of a reference image, with a predetermined threshold; said processor being further adapted for, in the case where, for at least one given pixel of the projected image, the difference is greater than the predetermined threshold, determining a modified supply value of at least one first electroluminescent element of the sub - assembly corresponding to the given pixel, with a view to storing the modified supply value in association with an identifier of the sub-assembly comprising the first electroluminescent element in a memory (106) of said light module.
    [6" id="c-fr-0006]
    6. Light module comprising: - at least one light source (100) comprising a set of electroluminescent elements (8) arranged on the same substrate (10), said set of electroluminescent elements comprising subsets of at least one electroluminescent element, each sub-assembly being able to be supplied with current individually; - a memory (106) storing power supply values in association with identifiers of subsets of electroluminescent elements; - a control unit capable of supplying the subassemblies of the light-emitting source as a function of the associated supply values; in which, on reception of a modified supply value in association with a given identifier of a subset of electroluminescent elements, the memory is able to store the modified supply value in association with the given identifier of the sub-assembly, and in which the control unit supplies said identified sub-assembly as a function of the modified supply value.
    [7" id="c-fr-0007]
    7. Light module according to claim 6, further comprising a temperature sensor capable of measuring a current temperature value; in which, on receipt of a modified supply value in association with a given identifier of a subset of electroluminescent elements and with a given temperature value, the memory is able to store the modified supply value in association with the given identifier of the subset and with the given temperature value; and in which, if an identifier of a subset is associated with several modified supply values and respective temperature values, the control module is able to select the modified supply value associated with the most temperature value close to the current temperature value.
    [8" id="c-fr-0008]
    8. Light module according to claim 7, further comprising a focusing unit capable of focusing a light beam from the light source, an imager capable of spatially modulating the light intensity of the focused beam, and a projection unit capable of project the modulated light beam towards the outside of the light module.
    [9" id="c-fr-0009]
    9. The light module according to claim 8, wherein the imager is an array of micro-mirrors.
    [10" id="c-fr-0010]
    10. Light module according to one of claims 6 to 9, wherein the light emitting elements are light emitting sticks of submillimetric dimension.
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    同族专利:
    公开号 | 公开日
    FR3076171B1|2021-10-29|
    US11235698B2|2022-02-01|
    US20190200427A1|2019-06-27|
    KR20190076878A|2019-07-02|
    CN109958956A|2019-07-02|
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    法律状态:
    2018-12-31| PLFP| Fee payment|Year of fee payment: 2 |
    2019-06-28| PLSC| Publication of the preliminary search report|Effective date: 20190628 |
    2019-12-31| PLFP| Fee payment|Year of fee payment: 3 |
    2020-12-31| PLFP| Fee payment|Year of fee payment: 4 |
    2021-12-31| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1763077|2017-12-22|
    FR1763077A|FR3076171B1|2017-12-22|2017-12-22|CALIBRATION OF A LIGHT MODULE WITH ELECTROLUMINESCENT ELEMENTS|FR1763077A| FR3076171B1|2017-12-22|2017-12-22|CALIBRATION OF A LIGHT MODULE WITH ELECTROLUMINESCENT ELEMENTS|
    KR1020180165792A| KR20190076878A|2017-12-22|2018-12-20|Calibration of a light module with light-emitting elements|
    US16/227,540| US11235698B2|2017-12-22|2018-12-20|Calibration of a light module with light-emitting elements|
    CN201811578710.7A| CN109958956A|2017-12-22|2018-12-21|The calibration of lamp module with light-emitting component|
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