CN115303171A - Method and device for operating a lighting device and lighting device - Google Patents

Method and device for operating a lighting device and lighting device Download PDF

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Publication number
CN115303171A
CN115303171A CN202210399793.3A CN202210399793A CN115303171A CN 115303171 A CN115303171 A CN 115303171A CN 202210399793 A CN202210399793 A CN 202210399793A CN 115303171 A CN115303171 A CN 115303171A
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CN
China
Prior art keywords
operating
image
operation mode
refresh rate
image signal
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Pending
Application number
CN202210399793.3A
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Chinese (zh)
Inventor
克里斯蒂安·布赫伯格
塞巴斯蒂安·多勒
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.)
Marelli Automotive Lighting Reutlingen Germany GmbH
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Marelli Automotive Lighting Reutlingen Germany GmbH
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Publication date
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Publication of CN115303171A publication Critical patent/CN115303171A/en
Pending legal-status Critical Current

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    • 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
    • H05B45/59—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits for reducing or suppressing flicker or glow effects
    • 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
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/0011—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor with light guides for distributing the light between several lighting or signalling devices
    • 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
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/06—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle
    • B60Q1/076—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle by electrical means including means to transmit the movements, e.g. shafts or joints
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • 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
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • B60Q1/1407—General lighting circuits comprising dimming circuits

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The invention relates to a method for operating a lighting device for a motor vehicle, wherein the method comprises: operating (102) an optoelectronic semiconductor component, in particular comprising a plurality of semiconductor light sources arranged in a matrix-like manner, for emitting a first light distribution in a first operating mode having a first image signal, a first image refresh rate and a first number of possible light intensity levels and/or possible color temperatures; and operating (104) the optoelectronic semiconductor component for emitting a second light distribution in at least one second operation mode following the first operation mode over time, the second operation mode having a second image signal, a second image refresh rate and a second number of possible brightness levels and/or possible color temperatures.

Description

Method and device for operating a lighting device and lighting device
Technical Field
The present invention relates to improvements in the field of vehicle lighting.
Background
Depending on the subject, the human eye perceives frequencies below the limiting frequency as flicker, especially when viewed peripherally. This effect is generally considered unpleasant and disconcerting, and is also a cause of various health hazards.
The photocell used to generate the light distribution has a rigid correlation between the image refresh rate and the light intensity level.
Disclosure of Invention
It is therefore an object of the invention to take into account the perception of the human eye, for example when operating a vehicle lighting device, in order not to impair traffic safety in particular.
The problem on which the invention is based is solved by a method according to claim 1 and by a device according to the independent claim and by a lighting device according to another independent claim.
A first aspect of the invention relates to a method for operating a lighting device for a motor vehicle, wherein the method comprises: operating an optoelectronic semiconductor component, in particular comprising a plurality of semiconductor light sources arranged in a matrix, for emitting a first light distribution in a first operating mode having a first image signal, a first image refresh rate and a first number of possible light intensity levels and/or possible color temperatures; and operating the optoelectronic semiconductor component for emitting a second light distribution in at least one second operation mode following the first operation mode over time, the second operation mode having a second image signal, a second image refresh rate and a second number of possible brightness levels and/or possible color temperatures.
Advantageously, the optoelectronic means operate at different image refresh rates, so as to take into account the characteristics of human visual perception. For example, human subjective sensitivity to image refresh rate is greater at low light intensities than at higher light intensities in the emitted light distribution.
One advantageous example is characterized in that the method comprises: operating the optoelectronic semiconductor member for emitting a third light distribution in a third operation mode following at least one second operation mode over time, the third operation mode having a third image signal, a third image refresh rate and a third number of possible brightness levels and/or possible color temperatures.
An advantageous example is characterized in that the first and third image refresh rates are above a threshold, in particular above 400Hz, and wherein the second image refresh rate is below the threshold, in particular below 400Hz.
Since in the automotive field dynamic relative movements of the observer and the observed light source are usual in particular in the case of reduced ambient light, a statically or semi-statically acting light source is perceived as flickering from the point of view of a human observer, both locally and in terms of light intensity, when it is operated at an image refresh rate below 400Hz. Thus, the opto-electronic component operates at the first and third image refresh rates.
An advantageous example is characterized in that the first and third image signals have a smaller mean time variation of the light intensity to be emitted between the two individual images, in particular a pixel-dependent variation, than the second image signal.
Advantageously, the static or semi-static first and third image signals may be emitted from the semiconductor member at an increased image refresh rate. Thus, the human perceives the emitted light distribution as no flicker.
In contrast, the more dynamic second image signal comprises a larger variation of the emitted light intensity, in particular for the individual semiconductor light sources. Here, the reduced second image refresh rate is accepted. Due to the large temporal variation of the light intensity within the emitted light distribution, the human observer perceives the reduced image refresh rate for displaying the second image signal as less intense, as when a static light distribution is emitted in terms of light intensity.
An advantageous example is characterized in that at least one mode-dependent association between the image signal and the operating mode is determined a priori.
Advantageously, the at least one a priori known association of image signals with the relevant pattern or with the respective image refresh rate is stored and made available for use in performing the method.
One advantageous example is characterized in that the method comprises: at least one of the operation modes, in particular the second operation mode, in particular at least one of the image refresh rates, in particular the second image refresh rate, is determined in dependence on the image signal and/or in dependence on a parameter associated with the image signal.
Advantageously, the image refresh rate may be determined in operation in dependence on a more dynamic image signal, e.g. the second image signal. Thereby, the image refresh rate is more variably adapted to the image signal and a flicker-free perception of the emitted respective light distribution can be further ensured.
An advantageous example is characterized in that a respective one of the operating modes of the optoelectronic component is associated with the number of possible brightness values of the optoelectronic component and the assigned pair of operating frequencies, in particular pulse width modulation frequencies.
One advantageous example is characterized in that the first light distribution is a low beam distribution, wherein the third light distribution is a high beam distribution, and wherein the second light distribution is an intermediate light distribution, which intermediate light distribution characterizes a transition from the low beam distribution to the high beam distribution.
Advantageously, the vehicle headlamp benefits from a flicker-free perceived transition from a low beam distribution to a high beam distribution and from a light distribution of flicker-free emission from the low beam distribution and the high beam distribution.
Another advantageous example is characterized in that the light distribution is used for illuminating an interior space of the motor vehicle. That is, the lighting device is a vehicle interior lighting device. For example, in a vehicle interior, a dimming function is used to gently increase or decrease the perceived light intensity. However, not only comfort is a factor here. The flicker-free perception also has safety so that the driver does not feel uneasy due to perceived flicker when, for example, the interior lighting device is turned on in a dimming manner.
In an advantageous example, the first and third operating modes are consistent, in particular, in terms of image refresh rate. Thus, a different average intensity of the respective emitted light distribution may be achieved between the first and third operation modes. In the second operation mode, the average light intensity emitted from the first operation mode is converted to the average light intensity of the third operation mode at an increased number of intensity levels, but at a reduced image refresh rate compared to the other operation modes.
A second aspect of the invention relates to a device for operating a lighting device for a motor vehicle, wherein the device is arranged to: operating an optoelectronic semiconductor component, in particular comprising a plurality of semiconductor light sources arranged in a matrix, for emitting a first light distribution in a first operating mode having a first image signal, a first image refresh rate and a first number of possible light intensity levels and/or possible color temperatures; and operating the optoelectronic semiconductor component for emitting a second light distribution in at least one second operation mode following the first operation mode over time, the second operation mode having a second image signal, a second image refresh rate and a second number of possible brightness levels and/or possible color temperatures.
A third aspect of the invention relates to a lighting device for a motor vehicle, comprising a device according to the second aspect and an optoelectronic semiconductor component.
Drawings
FIG. 1 shows a schematic flow diagram;
FIG. 2 shows a schematic block diagram;
FIG. 3 shows a light intensity-color temperature graph; and
fig. 4 shows a motor vehicle headlight in schematic form.
Detailed Description
Fig. 1 shows a method for operating a lighting device for a motor vehicle in a schematic flow chart.
In step 102, an optoelectronic semiconductor component, in particular comprising a plurality of semiconductor light sources arranged in a matrix-like manner, is therefore operated such that a first light distribution is operated in a first operating mode, which is characterized by a first image signal, a first image refresh rate and a first number of possible light intensity levels and/or possible color temperatures.
In step 104, the optoelectronic semiconductor component is operated for emitting a second light distribution in at least one second operation mode following the first operation mode over time, the second operation mode having a second image signal, a second image refresh rate and a second number of possible brightness levels and/or possible color temperatures.
The first and second modes of operation differ by at least a first and a second number of possible brightness levels.
A pulse width modulation frequency is assigned to each of the operating modes of the optoelectronic component. The pulse width modulation frequencies of the respective operating modes are each, for example, an anti-period duration lying between the possible on-time points of the individual semiconductor light sources. The respectively assigned image refresh rate for the selected operating mode is obtained by dividing the pulse width modulation frequency by the assigned number of brightness levels. The respective color temperature can be achieved by means of differently adjusted brightness levels, individual light sources which are arranged closely together in the sense of a respective pixel and emit different wavelengths.
A corresponding number of light levels refers to the light intensity that can be discretely adjusted and emitted by the respective semiconductor light source. For example, the emitted light intensity is adjusted by the on-duration of the semiconductor light source during the above-mentioned cycle duration.
The different types of operation of the photovoltaic element result from the increase in the number of pixels of the photovoltaic element and its complex control by means of image signals. These operation types provide a correspondingly fixed pulse width modulation frequency and a fixed number of assigned intensity levels in the sense of the intensity resolution. In other words, the optoelectronic component may operate using pairs comprising a pulse width modulation frequency and an assigned intensity resolution.
In one example, according to a further step 106, the optoelectronic semiconductor component is operated for emitting a third light distribution in a third operating mode following over time at least one second operating mode, the third operating mode having a third image signal, a third image refresh rate and a third number of possible brightness levels and/or possible color temperatures.
In one example, the first and third image refresh rates are above a threshold, in particular above 400Hz. While the second image refresh rate is below said threshold, in particular below 400Hz.
The method comprises in one example an optional step 103 for determining at least one of the operation modes, in particular the second operation mode, in particular at least one of the image refresh rates, in particular the second image refresh rate, in dependence on the image signal and/or in dependence on a parameter associated with the image signal. The determination of the second operation mode is thus made in dependence on the image signal and/or parameters associated therewith. For example, an expected or determined average image dynamics may first be determined, which is based on a comparison of a plurality of individual images of the second image signal.
Fig. 2 shows a schematic block diagram. The device 200 is provided for operating an optoelectronic semiconductor component 202. Thus, the respective light distributions La, lb, lc are emitted in dependence on the operating modes Ba, bb, bc active at the respective points in time and in dependence on the image signals Sa, sb, sc which are constant over time or which vary over time.
In one example, the first and third image signals Sa, sc have less mean time variation, in particular pixel-dependent variation, of the light intensity to be emitted between two separate images than the second image signal Sb. Thus, the second image signal Sb includes a more dynamic luminance change over time for each pixel or each light source.
In one example, the association of the image signals Sa, sb, sc with at least one mode correlation between the operation modes Ba, bb, bc is determined a priori.
A respective one of the operating modes Ba, bb, bc of the optoelectronic component 202 is associated with a pair of the number of possible brightness values of the optoelectronic component 202 and the assigned operating frequency, in particular pulse width modulation frequency.
If the lighting device is, for example, a vehicle headlight, the first light distribution is a low beam distribution, the third light distribution is a high beam distribution, and the second light distribution is an intermediate light distribution which characterizes the transition from the low beam distribution to the high beam distribution. Of course, it is also possible to switch from a high beam distribution to a low beam distribution in this way.
In an advantageous example, the first and third operating modes Ba, bc coincide, inter alia, in terms of image refresh rate. Thus, a different number of light intensity levels can be adjusted between the first and third operation modes Ba, bc, i.e. in the operation mode Bb.
In another example, the first, second and third modes of operation differ in respective image refresh rates.
Fig. 3 shows, in a schematic form, a graph depicting the light intensity I in lux versus the color temperature Tc in kelvin. If dynamic adaptation of the image refresh rate depending on the individual lighting conditions is allowed by changing the balance between the factors of equation (1) below, the region with high frequencies can be optimized to obtain the longest possible on-time.
Image refresh rate pulse width modulation frequency intensity resolution = constant (1)
Arrow 303 illustrates an example of a white light source scene with the possibility of switching different color temperatures: high intensity (200 lx) and high color temperature (5500K) were selected as starting points 310. Low intensity (24 lx) and low color temperature (3500K) were selected as end points 320. That is, in this example, in the first region 312 having a high PWM frequency, i.e., a high image refresh rate, begins. Thereby, undesired flicker is avoided. For relatively shorter translation times in the second region 330, the PWM frequency is reduced to facilitate higher intensity resolution, i.e., the image refresh rate is reduced compared to region 310. At the end of the transition period, the image refresh rate is increased again in the region 322 in order to achieve flicker-free illumination for the case of standstill.
A light source for illumination is therefore provided, which consists of one or more LEDs, optionally with different color temperatures or colors, and which can be dynamically controlled during dimming by means of pulse width modulation in such a way that an image refresh rate that is pleasant and imperceptible to humans is produced for as long as possible above the perceptible flicker frequency. Here, the pulse width modulation frequency is dynamically adapted in dependence on the illumination, color temperature or color variation so as to be only briefly below the perceptible frequency, if this is the case.
Fig. 4 shows a lighting device 400 for a motor vehicle. The lighting device 400 comprises a light module 100, which light module 100 is arranged in a housing 402. The light module 100 operates by means of the control device 404 to emit light. Light emitted from the optical module 100 is irradiated onto the transparent cover 406, and the transparent cover 406 closes the light transmission opening of the housing 402. An emitted light distribution 408 is emitted from the cover plate 406.

Claims (12)

1. A method for operating a lighting device (400) for a motor vehicle, wherein the method comprises:
an operation (102), in particular an optoelectronic semiconductor component (202) comprising a plurality of semiconductor light sources arranged in a matrix-like manner, for emitting a first light distribution (La) in a first operation mode (Ba) having a first image signal (Sa), a first image refresh rate and a first number of possible light intensity levels and/or possible color temperatures; and
operating (104) the optoelectronic semiconductor component (202) for emitting a second light distribution (Lb) in at least one second operation mode (Bb) following the first operation mode (Ba) over time, the second operation mode (Bb) having a second image signal (Sb), a second image refresh rate and a second number of possible brightness levels and/or possible color temperatures.
2. The method of claim 1, wherein the method comprises:
-operating (106) said optoelectronic semiconductor component (202) for emitting a third light distribution in a third operating mode (Bc) following said at least one second operating mode (Bb) over time, said third operating mode (Bc) having a third image signal (Sc), a third image refresh rate and a third number of possible brightness levels and/or possible color temperatures.
3. Method according to claim 2, wherein the first and third image refresh rates are above a threshold, in particular above 400Hz, and wherein the second image refresh rate is below the threshold, in particular below 400Hz.
4. A method according to claim 2 or 3, wherein the first and third image signals (Sa, sc) have less mean time variation, in particular pixel-dependent variation, of the light intensity to be emitted between two separate images than the second image signal (Sb).
5. Method according to any of the preceding claims, wherein at least one mode-dependent association between the image signals (Sa, sb, sc) and the operation modes (Ba, bb, bc) is determined a priori.
6. The method of any one of the preceding claims, comprising:
-determining (103) at least one of the operation modes (Ba, bb, bc), in particular the second operation mode (Bb), in particular at least one of the image refresh rates, in particular the second image refresh rate, in dependence on the image signal (Sb) and/or in dependence on a parameter associated with the image signal (Sb).
7. Method according to any one of the preceding claims, wherein a respective one of the operating modes (Ba, bb, bc) of the optoelectronic component (202) is associated with a pair of the number of possible luminance values and the assigned operating frequency, in particular pulse width modulation frequency, of the optoelectronic component (202).
8. The method according to any of the preceding claims, wherein the first light distribution is a low beam distribution, wherein the third light distribution is a high beam distribution, and wherein the second light distribution is an intermediate light distribution characterizing a transition from a low beam distribution to a high beam distribution.
9. A device (200) for operating a lighting device (400) for a motor vehicle, wherein the device (200) is arranged to:
an operation (102), in particular an optoelectronic semiconductor component (202) comprising a plurality of semiconductor light sources arranged in a matrix-like manner, for emitting a first light distribution (La) in a first operation mode (Ba) having a first image signal (Sa), a first image refresh rate and a first number of possible light intensity levels and/or possible color temperatures; and
operating (104) the optoelectronic semiconductor component (202) for emitting a second light distribution (La) in at least one second operation mode (Bb) following the first operation mode (Ba) over time, the second operation mode (Bb) having a second image signal (Sb), a second image refresh rate and a second number of possible brightness levels and/or possible color temperatures.
10. The apparatus (200) of claim 9, arranged to perform one of the methods mentioned in claims 2 to 8.
11. A lighting device (400) for a motor vehicle, comprising a device (200) according to any one of claims 9 and 10 and an optoelectronic semiconductor member (202).
12. The lighting device (400) of claim 11, wherein the lighting device (400) is configured as a motor vehicle headlight and/or tail light.
CN202210399793.3A 2021-05-07 2022-04-15 Method and device for operating a lighting device and lighting device Pending CN115303171A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021111913.8 2021-05-07
DE102021111913.8A DE102021111913A1 (en) 2021-05-07 2021-05-07 Method and device for operating a lighting device and lighting device

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CN115303171A true CN115303171A (en) 2022-11-08

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EP3885797A1 (en) 2020-03-25 2021-09-29 ZKW Group GmbH Vehicle surroundings detection system with variable field of view

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