EP4499451A1 - Procede de pilotage d'un dispositif lumineux - Google Patents
Procede de pilotage d'un dispositif lumineuxInfo
- Publication number
- EP4499451A1 EP4499451A1 EP23714768.1A EP23714768A EP4499451A1 EP 4499451 A1 EP4499451 A1 EP 4499451A1 EP 23714768 A EP23714768 A EP 23714768A EP 4499451 A1 EP4499451 A1 EP 4499451A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- images
- temperature
- control method
- control unit
- 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
Links
Classifications
-
- 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
- B60Q1/0017—Devices integrating an element dedicated to another function
- B60Q1/0023—Devices integrating an element dedicated to another function the element being a sensor, e.g. distance sensor, camera
-
- 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
- B60Q1/1415—Dimming circuits
- B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
- B60Q1/143—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic combined with another condition, e.g. using vehicle recognition from camera images or activation of wipers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/10—Protection of lighting devices
-
- 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
- H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
-
- 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
- B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
- B60Q2300/05—Special features for controlling or switching of the light beam
- B60Q2300/054—Variable non-standard intensity, i.e. emission of various beam intensities different from standard intensities, e.g. continuous or stepped transitions of intensity
-
- 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
- B60Q2400/00—Special features or arrangements of exterior signal lamps for vehicles
- B60Q2400/50—Projected symbol or information, e.g. onto the road or car body
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/40—Cooling of lighting devices
- F21S45/42—Forced cooling
- F21S45/43—Forced cooling using gas
Definitions
- TITLE METHOD FOR CONTROLLING A LIGHT DEVICE
- the technical field of the invention is that of lighting and/or signaling, particularly for motor vehicles.
- the present invention relates in particular to a method of controlling a lighting device and lighting using the method.
- automotive lighting devices are made up of pixelated light sources, that is to say presenting a plurality of elementary light sources that can be selectively activated and projection optics. But these light sources are sensitive to temperature.
- these light sources are pixelated LEDs (“Light Emitting Diode”) which are power LEDs which generate significant heating, particularly when the outside temperature is itself high (in summer for example). To avoid damaging the electronic components and the light source, you must stay below a given temperature (150° C for example).
- These lighting devices often include two or three projection modules, including a “high definition” or HD module, which allows the projection of images or patterns on the road in addition to conventional lighting which, in turn, , has a regulatory function.
- These images or patterns include at least one regulatory image (low beam or high beam for example) and one image for a non-regulatory function (pictogram for example) which are superimposed with and increase accordingly the temperature of the high definition module.
- the appearance of these images or patterns is often sudden, causing a sudden overload on the module and an increase in temperature.
- the lighting device is degraded; the light power then decreases uniformly, which degrades the regulatory lighting of the road and could pose safety problems.
- Motor vehicles are equipped with two lighting devices, or projectors, placed on either side of the front of said vehicles. Each of these devices can project a different image.
- the invention offers a solution to the problems mentioned above, by making it possible to maintain sufficient lighting for safety.
- One aspect of the invention relates to a method for controlling a lighting device for a motor vehicle, comprising: a pixelated light source presenting a plurality of elementary light sources which can be selectively activated and arranged in a box, a control unit controlling the actuation of the elementary light sources and making it possible to project at least two superimposed images, a temperature sensor placed in the box, remarkable in that it includes the following steps: measurement of the temperature, if the temperature is greater than one predefined threshold value, the light power of one of the two images is attenuated, the other remaining at the same light power.
- Each elementary light source is also called a “pixel”.
- the two superimposed images can be obtained by merging the images then sending the merged information to the control unit.
- the control unit receives the images separately and superimposes them.
- Each of the images is composed of points each associated with a pixel of the pixelated light source.
- each pixel is adapted for the projection of a common point of each image. More precisely, said pixels are those for which each of the two images has a non-zero power.
- the two powers add up, giving a light power total strictly greater than each of the light powers of each of the two images.
- the pixelated light source is a high-definition LED, each elementary light source comprising a semiconductor electroluminescent element.
- the predetermined threshold value is less than 150°C, because above this temperature the LEDs can degrade or even be destroyed.
- This threshold temperature is established at the p-n junction of the semiconductor. As this junction is not accessible, the LED has an integrated sensor which measures a temperature outside the junction. The differential is known and allows the temperature of the sensor to be calibrated to avoid exceeding 150° on the junction.
- the light power is attenuated in an individualized manner for each elementary light source.
- one of the images corresponds to a regulatory part, that is to say at least part of a regulatory beam, such as for example a low beam or a high beam.
- a regulatory beam we understand a beam which complies with the regulatory requirements in force, on the date of filing of this application, in at least one country, or group of countries.
- another of the images corresponds to a non-regulatory part, such as for example a pictogram.
- the image which is attenuated corresponds to a non-regulatory part. Thanks to the process, we can keep the image corresponding to the regulatory part at normal light power and attenuate the other. Security is thus preserved.
- the light power is controlled by a PWM (for “Pulse Width Modulation” in English, for pulse width modulation).
- PWM Pulse Width Modulation
- This control which changes the duty cycle, has the advantage of keeping the color of the light emitted by the light source, even if the power is attenuated, and of allowing precise adjustment of said power.
- the duty cycle represents the ratio between the duration of the high state and the period.
- the light power is controlled by modulation of the intensity of the power supply current of the light source. This control is simple to carry out.
- the temperature measurement is recurring.
- a temperature sensor recurrently measures the temperature, which makes it possible to adapt the reduction in light power according to the measured temperature.
- the device comprises several temperature sensors, and the elementary light sources of the pixelated light source are distributed into several groups, each associated with a sensor.
- the steps of the control process can be applied to each group of elementary light sources. It is thus possible to control the elementary light sources with better precision because the temperature measurement is carried out at a location closer to each of them, compared to the use of a single temperature sensor, global for the entire pixelated light source.
- the temperature measurement is advantageously recurring for each sensor.
- the images are refreshed over a period of between 1 ms and 1000 ms, and preferably between 1 ms and 255 ms. If the system is not responsive enough, i.e. the refresh period is too long, the temperature of the LED risks exceeding its temperature limit of 150°C. If it is too reactive, that is to say the refresh period is too short, there is a risk of a “rebound” or “breathing” phenomenon which is not desirable.
- a rebound phenomenon corresponds to an increase in the light power of the source, following a too marked drop, that is to say greater than the value necessary to maintain the temperature below the limit temperature.
- a breathing phenomenon corresponds to an alternation of successive decreases and increases in the light power of the source, each increase compensating for an excessively marked decrease, and each decrease compensating for an excessively marked increase, that is to say causing the the temperature above the limit.
- a refresh of between 1 and 24 images per second is sufficient for still images.
- the refresh rate is 24 frames per second or less.
- the refresh rate is also defined according to the need for responsiveness of the system, for security reasons: quickly displaying a pictogram or to ensure a sufficiently responsive and secure LED protection system (derating).
- the image corresponding to the part of a regulatory lighting beam can be obtained by superimposing several beams from different light modules.
- the modules may include a flat “low beam flat” or “LB flat” or “codes” module, a “high beam” or “headlights” module. >> (“high beam” in English), and a high definition (HD) module.
- the light emitted by these three modules can overlap at least partially.
- the high definition module illuminates the central part of the illuminated field of view.
- the two images are projected by the high definition module.
- This module has the highest pixel density and can project the most accurate images.
- Another aspect of the invention relates to a light device comprising: a pixelated light source presenting a plurality of elementary light sources which can be selectively activated and arranged in a box, a control unit controlling the actuation of the elementary light sources and making it possible to project at least two superimposed images, a temperature sensor placed in the box, remarkable in that the control unit implements the control method with at least one of the preceding characteristics.
- Another aspect of the invention relates to a light and/or a headlight for a motor vehicle comprising a light device according to the invention.
- the light and/or the projector comprises a housing having an opening, and a closing glass to close the opening of the housing.
- the source pixelated light and the temperature sensor are arranged inside the volume formed by the housing and the closing glass.
- control unit is placed in the volume formed by the housing and the closing glass. This allows good compactness of the light device.
- the light source and the control unit are arranged on the same support. This makes integration easier and reduces cost.
- control unit is placed outside the housing. This saves space and reduces thermal constraints: the light source heats up less and the control unit itself is less heated by the other components.
- Another aspect of the invention concerns a set of two lights and/or projectors, each according to the invention, the control units of each of the light devices being a single control unit common to said light devices.
- the two lights and/or projectors are each adapted to be mounted on a respective side (right or left) of the vehicle.
- FIG. 1 is an exploded view of a light device according to the invention
- FIG. 2 is a perspective view of a vehicle with a light device according to the invention projecting two images onto the road
- FIG. 3 shows a projection on a screen of the image emitted by a light device according to the invention
- FIG. 4 is a variation of the PWM according to the invention.
- FIG. 5 shows a projection of the low beam on a screen.
- the light device 1 illustrated in Figure 1 comprises a light source 10, projection optics 11, comprising for example lenses, a fan duct 12 with a fan 120, a heat sink 13 and a temperature sensor (not shown in the figure) integrated into the LED.
- a light device 1 is placed at the front of a vehicle 2 on each side in each of the projectors 20. Each light device 1 projects an image which may be different. In the example in Figure 2, the images from the left projector are shown. The light device 1 projects two superimposed light beams: a first beam 30 which projects a regulatory image 300 which consists of illuminating the road 4 and a second beam 31 which projects a comfort image 310 (here, a speed limit indication) or communication (risk of ice for example).
- a first beam 30 which projects a regulatory image 300 which consists of illuminating the road 4
- a second beam 31 which projects a comfort image 310 (here, a speed limit indication) or communication (risk of ice for example).
- front corresponds to the general direction of projection of the beams by the light device
- rear corresponding to the opposite direction.
- front When the device is mounted in a headlight in the normal position on a vehicle, the term “front” also corresponds to the front of the vehicle in the usual direction of travel thereof, and the term “rear” to the rear of the vehicle.
- the passing beam 32 can be broken down into two modules, a flat part 320 or "Fiat", corresponding to the majority of the beam with a flat upper edge and a part 321 with a cutoff 322 or “Kink” which makes a “V” cut.
- the high module definition 33 realizes the part of the beam with cutoff, and the flat part is provided by another module.
- the passing beam 32 includes a cut-off line to avoid dazzling other motorists coming in front. Above the cutoff line, little or no light may be emitted. Below the cut-off line, light is emitted to illuminate the roadway.
- This cutoff line has an elbow, with on one side of the elbow a horizontal line, and on the other side of the elbow a line inclined upwards, generally equal to 15°.
- the beam located under the 15° line is also used to illuminate objects located high up on the side of the road, for example a road sign.
- Certain pixels of the pixelated source of the high definition module are therefore lit both with the information of the regulatory image and that of the comfort image, that is to say that the light intensity of the The comfort image is added to the light intensity of the regulatory image.
- a temperature sensor arranged in relation to the pixelated light source 10 measures the temperature.
- a threshold value has been determined above which the light source of the light device risks deterioration. This threshold value may be different depending on the position of the temperature sensor.
- the control unit lowers the light power of only one of the two images, that is to say the comfort image 310. The light power makes it possible to obtain a projected light intensity between the regulatory minimum and maximum.
- This reduction in light power can be done either by modulating the intensity of the supply current of the elementary light sources, by adapting this power to lower the temperature.
- This adaptation can be carried out by modulating the width of the PWM pulses in the elementary light sources as can be seen in Figure 4.
- the PWM has a period T which does not vary.
- the combination of the two images can be done in different ways, if the first image is the regulatory image and the second image the comfort image.
- the PWM duty cycle obtained by the combination of the first and second images is equal to the highest PWM duty cycle of the two images.
- PWM duty cycle of the second image is greater than the PWM duty cycle of the first image then the PWM duty cycle of the combination of the first and second images will be equal to the PWM duty cycle of the second image, otherwise the ratio PWM duty cycle obtained by the combination of the first and second images is equal to the PWM duty cycle of the first image.
- the two PWM duty cycles are equal, then that of the first or the second image is taken into consideration indifferently.
- the second image risks being barely visible and completely buried in the first image, which is not favorable.
- the PWM duty cycle of the first image added to the PWM duty cycle of the second image is less than 1 (100%)
- the PWM duty cycle of the combination of the first and second images will be equal to the sum of the two PWM duty cycles (first image + second image), otherwise the PWM duty cycle of the combination of the first and second images will be limited to 1.
- This solution is more favorable for optimizing contrast, but overall PWM load is greater. This can also impact the image if blurring is necessary due to the threshold effect at 100% duty cycle.
- the PWM When the light device 1 is at a temperature below the threshold temperature, the PWM is in normal mode 5, the duration to of the rectangular signal of the PWM is equal to the duration between two rectangular signals, the duty cycle is then for example 50%, this value corresponding to the combination of the two images at the level of the pixel considered.
- the PWM is in degraded mode 6 (derating), the duration ti of the rectangular signal decreases while the frequency T does not change. The light device is thus lit for less time over a given period allowing a drop in temperature.
- the duration ti is for example reduced by 25%, i.e. a power reduction of 25%. So the duty cycle after the decline is 37.5%.
- This value makes it possible to maintain the minimum intensity required for the regulatory part. In the event of very high temperature, it is possible to go as far as the complete extinction of the image of comfort.
- the value of the normal duty cycle depends on the intensity of the images that we wish to project, and the value of the reduction depends on the temperature conditions in a given configuration, at a particular moment.
- Different degraded mode strategies are possible to optimize readability. For example, we can decide to lower only certain parts of the comfort image, for example the brightest, then, if necessary, to gradually lower the intensity of an increasing number of pixels.
- Another option is to first reduce, in greater numbers, the less luminous pixels, to keep an image always having the same shape, but refined.
- the control unit will adapt the duration ti as a function of the temperature, the higher it is, the smaller the duration ti will be.
- the attenuation adjustment can thus be very precise, by playing on this duration ti.
- the intensity of the current in the elementary light sources, when the source is turned on, that is to say during the duration ti of the rectangular signal, remains the same whatever the duration ti. This allows the color to be maintained.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2202972A FR3134168B1 (fr) | 2022-03-31 | 2022-03-31 | Procede de pilotage d’un dispositif lumineux |
| PCT/EP2023/058412 WO2023187125A1 (fr) | 2022-03-31 | 2023-03-30 | Procede de pilotage d'un dispositif lumineux |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4499451A1 true EP4499451A1 (fr) | 2025-02-05 |
Family
ID=82319900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23714768.1A Pending EP4499451A1 (fr) | 2022-03-31 | 2023-03-30 | Procede de pilotage d'un dispositif lumineux |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4499451A1 (fr) |
| JP (1) | JP2025510998A (fr) |
| CN (1) | CN118946479A (fr) |
| FR (1) | FR3134168B1 (fr) |
| WO (1) | WO2023187125A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3155285B1 (fr) * | 2023-11-10 | 2026-03-13 | Valeo Vision | Système d’éclairage de véhicule automobile muni d’un module lumineux apte à émettre un faisceau lumineux pixélisé |
| FR3161018A1 (fr) * | 2024-04-05 | 2025-10-10 | Valeo Vision | Dispositif d’éclairage d’un véhicule automobile. |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007052745A1 (de) * | 2007-11-06 | 2009-05-07 | Hella Kgaa Hueck & Co. | Scheinwerfer für Fahrzeuge |
| CN107155356B (zh) * | 2014-09-29 | 2019-04-23 | 富士胶片株式会社 | 投射型显示装置及其光源控制方法 |
| JP6697737B2 (ja) * | 2016-04-26 | 2020-05-27 | パナソニックIpマネジメント株式会社 | 点灯装置、及びそれを備える車両用照明装置 |
| FR3079470A1 (fr) * | 2018-04-03 | 2019-10-04 | Valeo Vision | Dispositif lumineux de vehicule automobile ayant au moins une source lumineuse pixelisee |
| DE102018130512A1 (de) * | 2018-11-30 | 2020-06-04 | HELLA GmbH & Co. KGaA | Beleuchtungsvorrichtung für Fahrzeuge |
| FR3096433B1 (fr) * | 2019-05-20 | 2021-05-21 | Valeo Vision | Procédé de contrôle d’un dispositif lumineux pour l'émission d’un faisceau lumineux pixelisé |
| FR3097937B1 (fr) * | 2019-06-28 | 2021-09-03 | Valeo Vision | Dispositif et procede de controle d'un ensemble de sources lumineuses pour vehicule automobile |
| DE102019006158A1 (de) * | 2019-09-02 | 2019-10-24 | Marcus Wallmeyer | Scheinwerfersystem mit Smartwatch oder Smartphone |
| DE102021201550A1 (de) * | 2021-02-18 | 2022-08-18 | Psa Automobiles Sa | Verfahren zum Betreiben eines hochauflösenden Projektionsscheinwerfers und Projektionsscheinwerfersystem für ein Kraftfahrzeug |
-
2022
- 2022-03-31 FR FR2202972A patent/FR3134168B1/fr active Active
-
2023
- 2023-03-30 CN CN202380030596.7A patent/CN118946479A/zh active Pending
- 2023-03-30 EP EP23714768.1A patent/EP4499451A1/fr active Pending
- 2023-03-30 JP JP2024557569A patent/JP2025510998A/ja active Pending
- 2023-03-30 WO PCT/EP2023/058412 patent/WO2023187125A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| JP2025510998A (ja) | 2025-04-15 |
| FR3134168A1 (fr) | 2023-10-06 |
| FR3134168B1 (fr) | 2024-07-26 |
| WO2023187125A1 (fr) | 2023-10-05 |
| CN118946479A (zh) | 2024-11-12 |
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