EP4348210A1 - Method for detecting a defective lighting element on a light source of a vehicle's headlight as compensable or as non-compensable - Google Patents

Method for detecting a defective lighting element on a light source of a vehicle's headlight as compensable or as non-compensable

Info

Publication number
EP4348210A1
EP4348210A1 EP21730119.1A EP21730119A EP4348210A1 EP 4348210 A1 EP4348210 A1 EP 4348210A1 EP 21730119 A EP21730119 A EP 21730119A EP 4348210 A1 EP4348210 A1 EP 4348210A1
Authority
EP
European Patent Office
Prior art keywords
defective
compensable
lighting
lighting element
cluster
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21730119.1A
Other languages
German (de)
French (fr)
Inventor
Daniel Brüggemann
Alberto Encinas
Florian Herold
Ingo Möllers
Henry Vogeler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hella GmbH and Co KGaA
Original Assignee
Hella GmbH and Co KGaA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hella GmbH and Co KGaA filed Critical Hella GmbH and Co KGaA
Publication of EP4348210A1 publication Critical patent/EP4348210A1/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/06—Testing the alignment of vehicle headlight devices
    • G01M11/064—Testing the alignment of vehicle headlight devices by using camera or other imaging system for the light analysis
    • G01M11/065—Testing the alignment of vehicle headlight devices by using camera or other imaging system for the light analysis details about the image analysis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q11/00—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00
    • B60Q11/005—Arrangement of monitoring devices for devices provided for in groups B60Q1/00 - B60Q9/00 for lighting devices, e.g. indicating if lamps are burning or not
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/58—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving end of life detection of LEDs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix

Definitions

  • the invention relates to a method for detecting a defective lighting element as com pensable or as non-compensable according to claim 1 .
  • Known headlights use one or several light sources with a plurality of lighting elements, e.g. light emitting diodes (LEDs), for illuminating a road in front of a vehicle.
  • LEDs light emitting diodes
  • DE 10 2018 101 686 B3 discloses a method for detecting defective lighting elements. Fur ther, it is determined whether the defective lighting elements are critical for the head light or not.
  • the computer-implemented method according to claim 1 is used for detecting a defec tive lighting element of a light source of a vehicle’s headlight as compensable or as non-compensable.
  • the lighting elements may for example be light emitting diodes.
  • the light source comprises several lighting elements.
  • the headlight may for example comprise several light sources, each comprising several lighting elements.
  • the defective lighting elements are searched within the lighting elements of the light source.
  • a defective lighting element may for example be a lighting element that is una ble to emit light.
  • a defective lighting element may for example be a lighting element that is unable to emit light in the way the respective lighting element was intentionally produced for.
  • a non-defective lighting element is understood in this description particularly as a lighting element that emits light in the way the respective lighting element was intentionally produced for.
  • a first defective lighting element is detected as a compensable lighting element when the number of defective lighting elements within a search region around the first defective lighting el ement is lower than a compensation threshold.
  • a second defective lighting element is detected as a non-compensable lighting element when the number of defective light ing elements within a search region around the second defective lighting element is equal to or higher than the compensation threshold.
  • This method is advantageous because it can be run independently from a state of the car or the headlight. For example, the method can be run every time before the head light is switched off. It is not necessary to place the car or the headlight in front of a wall in order to check which defective lighting elements can be compensated by non defective lighting elements.
  • the search region may comprise 8 light ing elements.
  • the search region may exclude the respective defective lighting element for which is detected, whether it is a compensable or a non-compen- sable lighting element.
  • the 8 lighting elements may be the 8 lighting elements which are considered most suitable to compensate for the defective lighting element.
  • the search region may comprise all light ing elements adjacent to the respective defective lighting element for which the search region is used.
  • the adjacent to lighting elements may for example comprise lighting elements, which are corner adjacent to the respective defective lighting element.
  • the search region may be limited to light ing elements adjacent to the respective defective lighting element.
  • the search region may be symmetrically arranged around the respective defective lighting element.
  • a cluster may be defined.
  • a number of non-compensable lighting elements within each cluster may be determined.
  • the light source may be detected to be defective when the number of non-compensable lighting elements within at least one of the clusters is higher than a cluster threshold.
  • This embodiment is especially advanta geous for avoiding unnecessarily discarding light sources. Even if there are some non- compensable lighting elements, this does not necessarily mean that the light field emitted by the light source is unusable. However, the light source or even the head light may be discarded when the number of non-compensable lighting elements within the cluster is higher than the cluster threshold.
  • the light source may virtually be sepa rated into a plurality of areas. This may in particular mean that the separation is not visible or measurable.
  • the virtual separation merely serves to describe the functional ity of this embodiment.
  • Each area may comprise several lighting elements.
  • the cluster threshold may depend on the area, of which the respective cluster is a part. There may for example be areas which are crucial for safety. In such areas the cluster threshold may for example be 1 or even 0. In other areas the cluster threshold may for example be 2, 3, 4 or even 5.
  • the virtual separation and the definition of the different cluster thresholds may for example depend on legal regulations.
  • a cluster may for example always be limited by the end of an area. For example, there is no cluster that bridges two areas.
  • the cluster may comprise 9 lighting ele ments. These 9 lighting elements may include the respective non-compensable light ing element for which the cluster has been defined. For example, the cluster may com prise the respective non-compensable lighting elements and the 8 lighting elements that were part of the search region for this respective non-compensable lighting ele ment.
  • the cluster may comprise the respective lighting element and all lighting elements adjacent to the respective lighting element. This may include lighting elements that are corner adjacent to the respective lighting element.
  • the cluster is limited to the respective lighting element and the lighting elements adjacent to the respective lighting element.
  • the cluster may have a symmetrical con figuration with the respective non-compensable lighting element as the cluster’s cen ter.
  • an error message may be displayed if the light source is detected to be defective. This is advantageous for showing a car’s user that he should discard the light source or the headlight.
  • the computer device comprises a processing unit and a digital storage unit.
  • the program instructions are stored on the digital storage unit.
  • the pro gram instructions are adapted to cause the central processing unit to perform a method according to an embodiment of the invention, when the processing unit exe cutes the program instructions.
  • the system according to claim 14 comprises a computer device according to an em bodiment of the invention and the headlight.
  • the car according to claim 15 comprises a system according to an embodiment of the invention.
  • Fig. 1 a schematic view of a non-compensable defective lighting element and a corresponding search region
  • Fig. 2 a schematic view of a compensable defective lighting element and a corre sponding search region
  • Fig. 3 a schematic view of a section of a light source with a plurality of lighting elements and a cluster of a non-compensable defective lighting element;
  • Fig. 4 a schematic view of the section of fig. 3 and a cluster of a further non-com pensable defective lighting element
  • Fig. 5 a schematic view of the section of fig. 3 and a cluster of a further non-com pensable defective lighting element
  • Fig. 6 a schematic view of a light source with several areas
  • Fig. 7 a schematic view of a method according to an embodiment of the invention.
  • Figure 1 shows a first defective lighting element 3 and its eight neighboring lighting el ements. All lighting elements are part of a light source for a vehicle’s headlight.
  • the neighboring lighting elements represent the search region for the first defective lighting element 3.
  • a compensation threshold may for example be 6. This means that the first lighting element 3 is detected as a non-compensable defective lighting element when the number of defective lighting elements within the search region is equal to or higher than this compensation threshold.
  • the search region in figure 1 comprises two non defective lighting elements 1 and six defective lighting elements 2, the first defective lighting element 3 is detected as non-compensable. This means that the effect of the first defective lighting element 3 to the overall light field of the headlight is expected to be non-compensable by the two non-defective neighboring lighting elements 1.
  • Figure 2 shows a second defective lighting element 4 and its eight neighboring lighting elements. All lighting elements are part of a light source for a vehicle’s headlight.
  • the neighboring lighting elements represent the search region for the second defective lighting element 4.
  • the compensation threshold may for example be 6.
  • the search region in figure 2 comprises three non-defective lighting elements 1 and five defective lighting elements 2, the second defective lighting element 4 is detected as compensa ble. This means that the effect of the second defective lighting element 4 to the overall light field of the headlight is expected to be compensable by the three non-defective neighboring lighting elements 1.
  • clusters 6, 7 and 8 on the light source’s section 5 are shown in figures 3-5.
  • Each cluster comprises nine lighting elements in cluding the respective non-compensable defective lighting element 3, for which the cluster is defined.
  • the cluster comprises the respective non-compensable light ing element 3 and the corresponding search region.
  • the cluster 6 comprises four non-compensable defective lighting elements 3.
  • the cluster 7 comprises five non-compensable defective lighting ele ments 3.
  • the cluster 8 comprises six non-compensable defective lighting elements 3.
  • a cluster threshold is defined. If the number of non-compensable defec tive lighting elements 3 of the light source is higher than the cluster threshold, the light source is detected to be defective and an error message may be displayed in the vehi cle’s passenger cabin. If the cluster threshold is for example four, the light source is detected as defective because the clusters 7 and 8 comprise more than four non-com pensable defective lighting elements 3. The light source is also detected as defective if the cluster threshold is five because the cluster 8 comprises more than five non-com pensable defective lighting elements 3.
  • Figure 6 shows the light source 9 with a first area 10, a second area 11 , a third area 12 and a fourth area 13.
  • a cluster threshold may be defined independently from the other areas.
  • the cluster threshold may for example be five for the first area 10, three for the second area 11 and for the fourth area 13, and one for the third area 12.
  • the cluster threshold may dependent on legal regulations.
  • the cluster threshold may be the lowest for the third area 12 because this area is significantly more important for the vehicle’s safety than for example the first area 10.
  • the method is shown as a schematic block diagram.
  • de fective lighting elements are searched within the light source 9.
  • a subsequent sec ond step S2 for each defective lighting element is detected whether it is a non-com- pensable defective lighting element 3 or a compensable defective lighting element 4 as described in detail with reference to figures 1 and 2.
  • the method may for example be performed each time when the headlight is switched off during the headlight’s pre-sleep state.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The invention relates to a computer-implemented method for detecting a defective lighting element (2; 3; 4) of a light source (9) of a vehicle's headlight as compensable or as non-compensable, wherein the light source (9) comprises several lighting elements (1; 2; 3; 4), wherein the method comprising the following steps: - searching (S1) for defective lighting elements (2; 3; 4) within the lighting elements (1; 2; 3; 4) of the light source (9); - detecting (S2) whether defective lighting elements (2; 3; 4) found in the search are compensable by non-defective lighting elements (1), wherein a first defective lighting element (4) is detected as a compensable lighting element (4) when the number of defective lighting elements (2) within a search region around the first defective lighting element (4) is lower than a compensation threshold, wherein a second defective lighting element (3) is detected as a non- compensable lighting element (3) when the number of defective lighting elements (2) within a search region around the second defective lighting element (3) is equal to or higher than the compensation threshold.

Description

Method for detecting a defective lighting element on a light source of a vehicle’s headlight as compensable or as non-compensable
Description
The invention relates to a method for detecting a defective lighting element as com pensable or as non-compensable according to claim 1 .
Known headlights use one or several light sources with a plurality of lighting elements, e.g. light emitting diodes (LEDs), for illuminating a road in front of a vehicle. During the headlight’s lifetime some of the lighting elements may become defective. This may be the case when it is impossible to make the particular lighting element to light up. DE 10 2018 101 686 B3 discloses a method for detecting defective lighting elements. Fur ther, it is determined whether the defective lighting elements are critical for the head light or not.
In light of the above, it is the object of the present invention to provide an easier way to detect defective lighting elements as compensable or as non-compensable. This object is achieved by the method according to claim 1 , the computer device according to claim 13, the system according to claim 14 and the car according to claim 15. Em bodiments of the invention are given in the dependent claims.
The computer-implemented method according to claim 1 is used for detecting a defec tive lighting element of a light source of a vehicle’s headlight as compensable or as non-compensable. The lighting elements may for example be light emitting diodes.
The light source comprises several lighting elements. The headlight may for example comprise several light sources, each comprising several lighting elements.
The defective lighting elements are searched within the lighting elements of the light source. A defective lighting element may for example be a lighting element that is una ble to emit light. A defective lighting element may for example be a lighting element that is unable to emit light in the way the respective lighting element was intentionally produced for.
Afterwards it is detected whether the defective lighting elements found in the search are compensable by non-defective lighting elements. A non-defective lighting element is understood in this description particularly as a lighting element that emits light in the way the respective lighting element was intentionally produced for. A first defective lighting element is detected as a compensable lighting element when the number of defective lighting elements within a search region around the first defective lighting el ement is lower than a compensation threshold. A second defective lighting element is detected as a non-compensable lighting element when the number of defective light ing elements within a search region around the second defective lighting element is equal to or higher than the compensation threshold.
This method is advantageous because it can be run independently from a state of the car or the headlight. For example, the method can be run every time before the head light is switched off. It is not necessary to place the car or the headlight in front of a wall in order to check which defective lighting elements can be compensated by non defective lighting elements.
According to an embodiment of the invention the search region may comprise 8 light ing elements. In particular, the search region may exclude the respective defective lighting element for which is detected, whether it is a compensable or a non-compen- sable lighting element. Thus, the 8 lighting elements may be the 8 lighting elements which are considered most suitable to compensate for the defective lighting element.
According to an embodiment of the invention the search region may comprise all light ing elements adjacent to the respective defective lighting element for which the search region is used. The adjacent to lighting elements may for example comprise lighting elements, which are corner adjacent to the respective defective lighting element. According to an embodiment of the invention the search region may be limited to light ing elements adjacent to the respective defective lighting element.
According to an embodiment of the invention the search region may be symmetrically arranged around the respective defective lighting element.
According to an embodiment of the invention for each non-compensable lighting ele ment a cluster may be defined. A number of non-compensable lighting elements within each cluster may be determined. The light source may be detected to be defective when the number of non-compensable lighting elements within at least one of the clusters is higher than a cluster threshold. This embodiment is especially advanta geous for avoiding unnecessarily discarding light sources. Even if there are some non- compensable lighting elements, this does not necessarily mean that the light field emitted by the light source is unusable. However, the light source or even the head light may be discarded when the number of non-compensable lighting elements within the cluster is higher than the cluster threshold.
According to an embodiment of the invention the light source may virtually be sepa rated into a plurality of areas. This may in particular mean that the separation is not visible or measurable. The virtual separation merely serves to describe the functional ity of this embodiment. Each area may comprise several lighting elements. The cluster threshold may depend on the area, of which the respective cluster is a part. There may for example be areas which are crucial for safety. In such areas the cluster threshold may for example be 1 or even 0. In other areas the cluster threshold may for example be 2, 3, 4 or even 5. The virtual separation and the definition of the different cluster thresholds may for example depend on legal regulations.
In this embodiment a cluster may for example always be limited by the end of an area. For example, there is no cluster that bridges two areas. According to an embodiment of the invention the cluster may comprise 9 lighting ele ments. These 9 lighting elements may include the respective non-compensable light ing element for which the cluster has been defined. For example, the cluster may com prise the respective non-compensable lighting elements and the 8 lighting elements that were part of the search region for this respective non-compensable lighting ele ment.
According to an embodiment of the invention the cluster may comprise the respective lighting element and all lighting elements adjacent to the respective lighting element. This may include lighting elements that are corner adjacent to the respective lighting element.
According to an embodiment of the invention the cluster is limited to the respective lighting element and the lighting elements adjacent to the respective lighting element.
According to an embodiment of the invention the cluster may have a symmetrical con figuration with the respective non-compensable lighting element as the cluster’s cen ter.
According to an embodiment of the invention an error message may be displayed if the light source is detected to be defective. This is advantageous for showing a car’s user that he should discard the light source or the headlight.
The computer device according to claim 13 comprises a processing unit and a digital storage unit. The program instructions are stored on the digital storage unit. The pro gram instructions are adapted to cause the central processing unit to perform a method according to an embodiment of the invention, when the processing unit exe cutes the program instructions.
The system according to claim 14 comprises a computer device according to an em bodiment of the invention and the headlight. The car according to claim 15 comprises a system according to an embodiment of the invention.
The invention is explained in more detail below with reference to the accompanying drawings. The same reference signs are used for identical or similar components and for components with identical or similar functions. Thereby shows:
Fig. 1 a schematic view of a non-compensable defective lighting element and a corresponding search region;
Fig. 2 a schematic view of a compensable defective lighting element and a corre sponding search region;
Fig. 3 a schematic view of a section of a light source with a plurality of lighting elements and a cluster of a non-compensable defective lighting element;
Fig. 4 a schematic view of the section of fig. 3 and a cluster of a further non-com pensable defective lighting element;
Fig. 5 a schematic view of the section of fig. 3 and a cluster of a further non-com pensable defective lighting element;
Fig. 6 a schematic view of a light source with several areas; and
Fig. 7 a schematic view of a method according to an embodiment of the invention.
Figure 1 shows a first defective lighting element 3 and its eight neighboring lighting el ements. All lighting elements are part of a light source for a vehicle’s headlight. The neighboring lighting elements represent the search region for the first defective lighting element 3. A compensation threshold may for example be 6. This means that the first lighting element 3 is detected as a non-compensable defective lighting element when the number of defective lighting elements within the search region is equal to or higher than this compensation threshold. As the search region in figure 1 comprises two non defective lighting elements 1 and six defective lighting elements 2, the first defective lighting element 3 is detected as non-compensable. This means that the effect of the first defective lighting element 3 to the overall light field of the headlight is expected to be non-compensable by the two non-defective neighboring lighting elements 1. Figure 2 shows a second defective lighting element 4 and its eight neighboring lighting elements. All lighting elements are part of a light source for a vehicle’s headlight. The neighboring lighting elements represent the search region for the second defective lighting element 4. The compensation threshold may for example be 6. As the search region in figure 2 comprises three non-defective lighting elements 1 and five defective lighting elements 2, the second defective lighting element 4 is detected as compensa ble. This means that the effect of the second defective lighting element 4 to the overall light field of the headlight is expected to be compensable by the three non-defective neighboring lighting elements 1.
When having detected several non-compensable defective lighting elements 3 and several compensable defective lighting elements 4, for all non-compensable lighting elements 3 a cluster is defined. Exemplary clusters 6, 7 and 8 on the light source’s section 5 are shown in figures 3-5. Each cluster comprises nine lighting elements in cluding the respective non-compensable defective lighting element 3, for which the cluster is defined. Thus, the cluster comprises the respective non-compensable light ing element 3 and the corresponding search region.
In figure 3, the cluster 6 comprises four non-compensable defective lighting elements 3. In figure 4, the cluster 7 comprises five non-compensable defective lighting ele ments 3. In figure 5, the cluster 8 comprises six non-compensable defective lighting elements 3. A cluster threshold is defined. If the number of non-compensable defec tive lighting elements 3 of the light source is higher than the cluster threshold, the light source is detected to be defective and an error message may be displayed in the vehi cle’s passenger cabin. If the cluster threshold is for example four, the light source is detected as defective because the clusters 7 and 8 comprise more than four non-com pensable defective lighting elements 3. The light source is also detected as defective if the cluster threshold is five because the cluster 8 comprises more than five non-com pensable defective lighting elements 3.
Figure 6 shows the light source 9 with a first area 10, a second area 11 , a third area 12 and a fourth area 13. For each area 10, 11 , 12 and 13 a cluster threshold may be defined independently from the other areas. The cluster threshold may for example be five for the first area 10, three for the second area 11 and for the fourth area 13, and one for the third area 12. The cluster threshold may dependent on legal regulations. For example, the cluster threshold may be the lowest for the third area 12 because this area is significantly more important for the vehicle’s safety than for example the first area 10.
In figure 7, the method is shown as a schematic block diagram. In a first step S1 , de fective lighting elements are searched within the light source 9. In a subsequent sec ond step S2, for each defective lighting element is detected whether it is a non-com- pensable defective lighting element 3 or a compensable defective lighting element 4 as described in detail with reference to figures 1 and 2. In further method steps, it may be determined whether the light source 9 is defective when the number of non-com- pensable defective lighting elements 3 exceeds the cluster threshold as described in detail with reference to figures 3 to 6.
The method may for example be performed each time when the headlight is switched off during the headlight’s pre-sleep state.
List of reference signs
1 Non-defective lighting element
2 Defective lighting element
3 Non-compensable defective lighting element
4 Compensable defective lighting element
5 Section
6 Cluster
7 Cluster
8 Cluster
9 Light source
10 First area
11 Second area
12 Third area
13 Fourth area

Claims

Method for detecting a defective lighting element on a light source of a vehicle’s headlight as compensable or as non-compensable Claims
1. Computer-implemented method for detecting a defective lighting element (2; 3; 4) of a light source (9) of a vehicle’s headlight as compensable or as non- compensable, wherein the light source (9) comprises several lighting ele ments (1 ; 2; 3; 4), wherein the method comprising the following steps:
- searching (S1 ) for defective lighting elements (2; 3; 4) within the light ing elements (1 ; 2; 3; 4) of the light source (9);
- detecting (S2) whether defective lighting elements (2; 3; 4) found in the search are compensable by non-defective lighting elements (1), wherein a first defective lighting element (4) is detected as a com pensable lighting element (4) when the number of defective lighting elements (2) within a search region around the first defective lighting element (4) is lower than a compensation threshold, wherein a sec ond defective lighting element (3) is detected as a non-compensable lighting element (3) when the number of defective lighting elements (2) within a search region around the second defective lighting ele ment (3) is equal to or higher than the compensation threshold.
2. Method according to one of the preceding claims, wherein the search region comprises 8 lighting elements.
3. Method according to one of the preceding claims, wherein the search region comprises all lighting elements adjacent to the respective lighting element.
4. Method according to one of the preceding claims, wherein the search region is limited to the lighting elements adjacent to the respective lighting element.
5. Method according to one of the preceding claims, wherein the search region is symmetrically arranged around the respective lighting element.
6. Method according to one of the preceding claims, wherein for each non- compensable lighting element (3) a cluster (6; 7; 8) is defined, wherein a number of non-compensable lighting elements (3) within each cluster (6; 7; 8) is determined, wherein the light source (9) is detected to be defective when the number of non-compensable lighting elements (3) within at least one of the clusters (6; 7; 8) is higher than a cluster threshold
7. Method according to the preceding claim, wherein the light source (9) is vir tually separated into a plurality of areas (10; 11 ; 12; 13), wherein each area (10; 11 ; 12; 13) comprises several lighting elements (1 ; 2; 3; 4), and wherein the cluster threshold depends on the area (10; 11 ; 12; 13), of which the respective cluster (6; 7; 8) is a part.
8. Method according to one of the two the preceding claim, wherein the cluster (6; 7; 8) comprises 9 lighting elements (1 ; 2; 3; 4).
9. Method according to one the three preceding claims, wherein the cluster (6; 7; 8) comprises the respective lighting element and all neighbouring lighting elements of the respective lighting element.
10. Method according to one of the four preceding claims, wherein the cluster (6; 7; 8) is limited to the respective lighting element and the lighting ele ments adjacent to the respective lighting element.
11. Method according to one of the five preceding claims, wherein the cluster (6; 7; 8) has a symmetrical configuration with the respective lighting element as the cluster’s center.
12. Method according to one of the six preceding claims, wherein an error mes sage is displayed if the light source (9) is detected to be defective.
13. Computer device, comprising a processing unit and a digital storage unit, wherein program instructions are stored on the digital storage unit, and wherein the program instructions are adapted to cause the processing unit to perform a method according to one of the preceding claims, when the processing unit executes the program instructions.
14. System, comprising a computer device according to the preceding claim and the headlight.
15. Car, comprising a system according to the preceding claim.
EP21730119.1A 2021-05-26 2021-05-26 Method for detecting a defective lighting element on a light source of a vehicle's headlight as compensable or as non-compensable Pending EP4348210A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2021/064008 WO2022248030A1 (en) 2021-05-26 2021-05-26 Method for detecting a defective lighting element on a light source of a vehicle's headlight as compensable or as non-compensable

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EP4348210A1 true EP4348210A1 (en) 2024-04-10

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DE102018101686B3 (en) 2018-01-25 2019-01-24 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Method for detecting pixel element states of a matrix headlight of a matrix headlight system

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