EP3208531A2 - Phare de véhicule automobile comprenant un affichage à cristaux liquides - Google Patents

Phare de véhicule automobile comprenant un affichage à cristaux liquides Download PDF

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Publication number
EP3208531A2
EP3208531A2 EP17156657.3A EP17156657A EP3208531A2 EP 3208531 A2 EP3208531 A2 EP 3208531A2 EP 17156657 A EP17156657 A EP 17156657A EP 3208531 A2 EP3208531 A2 EP 3208531A2
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EP
European Patent Office
Prior art keywords
liquid crystal
matrix element
crystal matrix
light
beam splitter
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.)
Granted
Application number
EP17156657.3A
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German (de)
English (en)
Other versions
EP3208531A3 (fr
EP3208531B1 (fr
Inventor
Joachim Knittel
Martin Licht
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
Original Assignee
Automotive Lighting Reutlingen GmbH
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Publication of EP3208531A2 publication Critical patent/EP3208531A2/fr
Publication of EP3208531A3 publication Critical patent/EP3208531A3/fr
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Publication of EP3208531B1 publication Critical patent/EP3208531B1/fr
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Classifications

    • 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
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/63—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates
    • F21S41/64—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices
    • F21S41/645—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by changing their light transmissivity, e.g. by liquid crystal or electrochromic devices by electro-optic means, e.g. liquid crystal or electrochromic devices
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • 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
    • F21S41/12—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of emitted light
    • F21S41/135—Polarised

Definitions

  • the present invention relates to a motor vehicle headlight according to the preamble of claim 1.
  • Such a headlight is from the DE 10 2013 113 807 A1 known.
  • Liquid crystal matrix components are used as a display (LCD) but also in video projectors.
  • Another disadvantage is a rather weak contrast ratio between luminous and non-luminous matrix elements.
  • Another disadvantage is that the function of the liquid-crystal matrix elements as light-controllable segments of a light-emitting surface of the liquid-crystal matrix component illumination with linear polarized light presupposes.
  • Light of conventional light sources is initially not polarized and has two portions of mutually orthogonal polarization directions.
  • the light is polarized before it strikes the liquid crystal matrix device.
  • the polarization is usually carried out by a polarizing filter that lets only one of the two components through and absorbs the other component.
  • This document shows a motor vehicle headlamp with a light source, a polarizing beam splitter, which is arranged in a light beam emanating from the light source and divides the incident light from the light source into a first sub-beam and a second sub-beam, wherein the light of the first sub-beam a first Polarization direction and having a first Schopropagations psychologist, and wherein the light of the second sub-beam having a second polarization direction and a second Mannpropagationsraum, and having a first reflective liquid crystal matrix element region whose influence on the polarization direction of the reflected light is controllable, and with a second reflective liquid crystal matrix element region whose influence is controllable to the polarization direction of the reflected light.
  • the liquid crystal matrix element regions are operated in transmission.
  • the from the DE 10 2013 113 807A1 known headlight requires its own projection optics for each direction of polarization. Each of the two projection optics transmits polarized light. Headlights should generally produce light distributions that consist of unpolarized light. This may require an additional depolarization device. Since two projection optics are required, there is a doubling of the light exit surface and thus a halving of the luminance compared to a solution that requires only a projection optics.
  • the known headlight is a so-called matrix headlight, in which the brightness of individual pixels of the liquid crystal element is controllable.
  • matrix headlights in automotive technology, a dynamic adjustment of the light distribution of the headlamps to changing environmental conditions. For example, at night driving with high beam individual subregions of the light distribution can be darkened, so that an oncoming vehicle is not dazzled despite the high beam.
  • headlights can also be equipped, for example, with micromirrors (eg DE 10 2013 113807 A1 . EP 2 813 395 A1 ) will be realized. Disadvantages of these concepts are the high costs for the micromirrors.
  • the object of the present invention is to provide a headlamp of the type mentioned above, which requires a smaller light exit surface and has a greater luminance and which is also able to produce a substantially unpolarized light existing light distribution without additional depolarizers.
  • the present invention differs in that the first liquid crystal matrix element region in the first sub-beam is arranged to reflect incident light back to the beam splitter from the beam splitter, and the second liquid crystal matrix element region in the second sub-beam is arranged to receive light from the beam splitter reflected back to the beam splitter.
  • the liquid crystal matrix element regions are operated in reflection in the invention. Suitable liquid crystal components are known, for example, from the publication " Optical Imaging and Metrology, edited by W.Osten and N.Reingand, 2012 Wiley-VCH Publishing known.
  • the light reflected back from the liquid-crystal matrix element regions is combined by the beam splitter and projected into the emission direction by means of projection optics.
  • the liquid crystal matrix element regions have, above all, the task of modulating the incident light pixel by pixel in accordance with the required light function.
  • a preferred embodiment is characterized in that the two liquid-crystal matrix element regions are aligned parallel to one another, and that a deflecting mirror is arranged between the second liquid-crystal matrix element region and the beam splitter.
  • the two liquid crystal matrix element regions are arranged in the same plane.
  • a further preferred embodiment is characterized in that the two liquid crystal matrix element areas adjoin one another and belong to the same component.
  • the individual pixels of the liquid crystal matrix element regions are driven so that the polarization of the light reflected thereon is not rotated in an outer region and is rotated in an inner region, and that inner region having a larger magnification factor into one Lighting zone of the headlamp is shown, is smaller than the inner area, which is imaged with a larger magnification factor in a lighting zone of the headlamp.
  • the first liquid-crystal matrix element region belongs to a first component
  • that the second liquid-crystal matrix element region belongs to a second component that is separate from the first component
  • a further preferred refinement is characterized in that the two liquid-crystal matrix element regions are arranged offset from one another parallel to one another in different, mutually parallel planes.
  • the two liquid-crystal matrix element regions prefferably be offset parallel to one another in different planes parallel to one another, and for a distance perpendicular to the pixel surfaces between the two liquid crystal element regions to be equal to a mean distance of the deflection mirror from the beam splitter.
  • the two liquid crystal matrix element regions make a right angle with each other, one surface of the Liquid crystal matrix element region facing a first side of the beam splitter and wherein a surface of the second liquid crystal matrix element region faces a second surface of the beam splitter.
  • liquid-crystal matrix element regions are arranged such that the light incident from the beam splitter is incident perpendicularly on the liquid-crystal matrix element regions and thus also is reflected perpendicularly.
  • a preferred embodiment is characterized by a projection optical system which is arranged behind the beam splitter in the beam path of the light reflected by the liquid crystal matrix element regions.
  • a beam splitter-side focal point of the projection optics is located in the vicinity of the surfaces of the liquid-crystal matrix element regions.
  • a further preferred refinement is characterized in that a first optical element is arranged between the light source and the beam splitter, and that the first optical element is set up to parallelize light emanating from the light source.
  • the first optical element is a lens, a reflector or a catadioptric attachment optics.
  • the polarizing beam splitter consists of two prismatic halves.
  • the beam splitter is a thin film polarizer.
  • FIG. 1 a headlight 10 of a motor vehicle.
  • the headlight 10 has a housing 12, the light exit opening of a transparent Cover 14 is covered. Inside the housing 12 is a light module 16 and a control unit 18th
  • the control unit 18 is set up, in particular programmed, to control the function of the light module 16 in response to signals from a desired driver 20 or a higher-level light control device 22 of the motor vehicle.
  • the driver's desire encoder 20 is, for example, a light switch of the motor vehicle.
  • the FIG. 2 shows details of a features of the invention having light module 16 of a headlight according to the invention.
  • the light module 16 comprises a light source 24, a polarizing beam splitter 26, a first reflective liquid crystal matrix element region 28, a second reflective liquid crystal matrix element region 30, and a projection optical system 32.
  • the light source 24 preferably has at least one, but preferably a plurality of light-emitting diodes.
  • the light emitting diodes emit light of white color, as is permissible for motor vehicle headlights.
  • a light bundle 25 of unpolarized light emanating from the light source 24 is preferably first parallelized by a first optical element 27.
  • the first optical element 27 is preferably realized as a lens or as a reflector or as a catadioptric optical attachment.
  • the parallelized light beam 29 emanating from the first optical element 27 is incident on the polarizing beam splitter 26.
  • the first optical element 27 is located between the light source 24 and the beam splitter 26.
  • the beam splitter 26 is shown here schematically as a beam splitter cube, which consists of two prismatic halves, each having the shape of a right-angled and equilateral triangle in the plane of the drawing and which are along their respective right angle opposite base surfaces assembled into a cube. The base surfaces of such a cube are then the beam-splitting surfaces 31. Contrary to this embodiment, the beam splitter 26 is preferably a thin-film polarizer.
  • the beam splitting surfaces 31 of the beam splitter 26 appear as a line lying in a pz plane of a right-right coordinate system 34.
  • the coordinate system 34 has an s-axis, a p-axis and a z-axis, wherein the axes are orthogonal to each other.
  • the shape and position of the beam-splitting surface 31 results in this representation by shifting the beam-splitting surface 31 performing line in the S-direction.
  • a light incidence plane in which light ultimately emanating from the light source 24 is incident on the beam splitter 26 is identical to the plane of the drawing and is therefore parallel to a p-z plane.
  • Such a light incidence plane is defined by the direction of the incident beam and the perpendicular of the plane surface on which the beam is incident.
  • the incident, unpolarized light 29 has a first portion which is polarized parallel to the pz-light incidence plane. This share is also referred to below as the p share. Its polarization direction lies in the plane of the drawing.
  • the incident, unpolarized light 29 also has a second portion polarized perpendicular to the p-z light incidence plane. This share is also referred to below as the s share. Its polarization direction is perpendicular to the plane of the drawing.
  • the polarizing beam splitter 26 has the property of being transparent to one of the two components and of reflecting the other component. Without limiting the generality, it should be assumed in the following that the polarizing beam splitter 26 is transparent to the p component and reflects the s component. This means that the p component passes through the beam-dividing surfaces 31 and that the s component is reflected at the beam-dividing surfaces 31. In an alternative embodiment, the polarizing beam splitter 26 is transparent to the s-component and reflects the s-component.
  • the polarizing beam splitter 26 divides the light 24 directly or, if a first optical element 27 is present, light 28 incident on the first optical element 27 into a first sub-beam 36 and a second sub-beam 38.
  • the light of the first sub-beam 36 has a first polarization direction (here parallel to the plane of incidence, hence referred to as the p-direction) and a first main propagation direction.
  • This sub-beam 36 passes through the beam-splitting surfaces 31.
  • the first main propagation direction points toward the first liquid crystal matrix element region 28, which is thus illuminated with the p component.
  • the light of the second sub-beam 38 has a second one Polarization direction (here perpendicular to the plane of incidence, therefore referred to as s-direction) and a second Kleinpropagationsraum on.
  • This sub-beam 38 is reflected at the beam-splitting surfaces. After reflection, the second main propagation direction points to the second liquid crystal matrix element region 30, which is thus illuminated with the s component.
  • the first liquid crystal matrix element region 28 is arranged in the first sub-beam 36 in such a way that it reflects back incident light from the beam splitter 26 to the beam splitter 26.
  • the first liquid-crystal matrix element region 28 is thus aligned perpendicular to the incident partial bundle 36.
  • the second liquid crystal matrix element region 30 is arranged in the second sub-beam 38 in such a way that it reflects back incident light from the beam splitter 26 to the beam splitter 26.
  • the second liquid-crystal matrix element region 30 is therefore aligned perpendicular to the incident sub-beam 38.
  • the influence of the first reflective liquid-crystal matrix element region 30 on the polarization direction of the light reflected on it can be controlled pixel by pixel by the control device 18.
  • the control intervention rotates the polarization direction of the reflected beam more or less.
  • the first liquid crystal matrix element region 28 has 10 pixels in the p direction, so that if the number of pixels in the s direction is equal, a number of 100 pixels would result. In reality, the number of Pixels also be much higher and on the order of several hundred thousand.
  • the influence of the second reflective liquid-crystal matrix element region 30 on the polarization direction of the light reflected thereon can be controlled pixel-by-pixel by the control device 18.
  • the second liquid crystal matrix element region 30 has 10 pixels in the z-direction, so that if the number of pixels in the s-direction was the same, a figure of 100 pixels would result. Again, the number of pixels in reality can be much greater. This number will generally correspond to the number of pixels of the first liquid crystal matrix element region 28.
  • the reflectance of the liquid crystal matrix element regions additionally depends on the angle of incidence of the light incident on the pixels.
  • the parallelization achieved with the first optical element 27 is advantageous because it results in the light rays of a beam impinging on the pixels at the same angle of incidence.
  • the angle of incidence to the solder is preferably zero degrees. Then there is an unconstrained reversal in the direction of the reflection in the pixels, which returns the light reflected in the pixels to the beam splitter again without any further deflections.
  • the pixels shown crossed are driven by the controller to rotate the polarization of the light incident thereon by 90 °, so that light incident on these pixels polarized in the p direction is extracted from the cross-hatched pixels exit as s-polarized light.
  • Analog should be shown for the crossed Pixels, light incident on the pixels, which is polarized in the s direction, emerges from these pixels as light polarized in the p direction.
  • the pixels not shown crossed should not change the polarization direction, so that the polarization direction of the light emerging from these pixels corresponds to the polarization direction of the light incident on this pixel.
  • the light reflected at the crossed pixels of the second liquid crystal matrix element region 30, which is reflected back to the beam splitter 26, is incident there as p-polarized light and is transmitted as such from the beam splitter in the p direction.
  • the two light components are thus brought together again by the beam splitter 26 to form a light bundle.
  • This light beam is preferably distributed by a projection optical system 32 in a lying in front of the headlight illumination zone.
  • Pixels of the two liquid crystal matrix element regions 28, 30 that are not crossed are pixels which are controlled by the control device 18 such that they do not rotate the polarization of the light incident there.
  • the pixels of the first liquid crystal matrix element region 28 which are not crossed are reflected Rays in the illustrated embodiment with a p-polarization impinge on the beam splitter and are therefore transmitted after reflection at the first liquid crystal matrix element region 28 in the direction of the light source 24. These light beams thus do not contribute to the light distribution in the lighting zone in front of the headlight.
  • the rays reflected at the pixels of the second liquid-crystal matrix element region 30 which are not crossed will impinge on the beam splitter 26 with an s-polarization in the exemplary embodiment shown and will therefore be reflected in the direction of the light source 24. These light beams also do not contribute to the light distribution in the lighting zone in front of the headlight.
  • a beam splitter-side focal point of the projection optics 32 is preferably located in the vicinity of the surfaces of the liquid crystal matrix element regions 28, 30.
  • a proximity of the focal point to the surfaces 28, 30 is understood to be between 0 and 10% of the focal length of the projection optics 32.
  • the projection optical system 32 then forms the illumination pattern of the light component transmitted from the beam splitter 26 to the projection optics in the vicinity of the focal point as light distribution into the aforementioned illumination zone.
  • the illumination pattern that arises in the illumination zone in front of the headlight can therefore be shaped by controlling the pixels with a fineness given by the pixel size.
  • the control unit 18 By changing the control of the pixels by the control unit 18, therefore, different light distributions with controllably distributed bright and create dark areas in the lighting zone in front of the headlight. Since the two differently polarized components are reunited by the beam splitter 26 into a bundle, the light distribution arising in the illumination zone consists essentially of unpolarized light. This assumes that the spatial pattern of the pixel drive is the same or at least similar in both liquid crystal matrix element regions.
  • the second liquid-crystal matrix element region 30 is preferably arranged such that its pixel surface is oriented perpendicular to the light emerging from the beam splitter 26 and incident on it without deflection. Moreover, the second liquid crystal matrix element region 30 is preferably arranged so that the distance of its pixel surface from the beam splitter 26 is the same as the distance of the pixel surface of the first liquid crystal matrix element region 28 from the beam splitter 26.
  • this embodiment does not require a deflection mirror between one of the two liquid crystal matrix element regions 28, 30 and the beam splitter 26.
  • this embodiment requires two different liquid crystal matrix element region components, since the Liquid crystal matrix element regions 28, 30 are not arranged in a single plane and therefore can not be realized as subregions of a single liquid crystal matrix element region component.
  • the white light impinging on the beam splitter 26 from the light source 24 has an intensity profile with a maximum transverse to its propagation direction, which lies in the region of a central emission direction and that towards the sides, ie with increasing distance from the middle Direction of radiation, is continuously lower. This results in the last in a floodlit lighting zone in front of the motor vehicle soft to the sides, i. without a sharp cut-off-light border, which favors the formation of a usual for motor vehicles light distribution.
  • the projection optics 32 it is desirable for the projection optics 32 to image the surface of the two liquid-crystal matrix element regions 28, 30 and their pixels in the illumination zone in a manner that is as sharp as possible and precise in position, so that the image of each pixel is illuminated as far as possible by unpolarized light.
  • FIG. 3 shows details of another embodiment of a headlight according to the invention.
  • the illumination of the second liquid-crystal matrix element region 30 takes place via a mirror 39.
  • the mirror 39 is preferably designed such that it reflects both polarization directions s and p equally well and does not change the two polarization directions during the reflection.
  • the distances between the two Liquid crystal matrix element regions 28 and 30 of the projection optics 32 are in the subject of FIG. 3 different from each other.
  • the beam splitter-side focal point of the projection optical system 32 is closer to one of the two liquid crystal matrix element regions 28, 30 than to the respective other liquid crystal matrix element region 30, 28.
  • different object widths and hence slightly different magnification factors result for the two liquid crystal matrix element regions 28, 30 through the projection optics 32 taking place picture.
  • liquid crystal matrix element regions and particularly LCoS regions, have a very large number of pixels (e.g., several hundred thousand), this undesirable effect of different magnification factors can be compensated by adjusting the object size on the liquid crystal matrix element regions.
  • FIG. 4 Figure 12 illustrates the image of the surface of the liquid crystal matrix element areas in the headlamp illumination zone of the headlamp.
  • the FIG. 4 shows left in the figure part a), the surface regions 28 ', 30' of the two Liquid crystal matrix element regions 28, 30, in which the polarization is rotated, in the ps plane and on the right in the figure part b), the overlap of their two images 28 ", 30" after their projection through the projection optics 32 in the illumination zone.
  • a rectangular area should be illuminated in exactly the same position as overlapping contributions 28 ", 30" of both polarization directions.
  • the individual pixels of the liquid crystal matrix element regions 28, 30 are switched so that the polarization in the outer region is not rotated and is rotated in the inner regions.
  • the outer area is in the FIG. 4 in each case the difference of the surfaces 30 and 30 'as well as 28 and 28'. Only light from the areas where the polarization is rotated is transmitted or reflected by the beam splitter to the projection optics.
  • the liquid crystal matrix element region that is imaged into the illumination zone with the larger magnification factor is reduced by a corresponding drive of its outer pixels on the liquid crystal matrix element region. In the example shown, this is the liquid crystal matrix element region 28.
  • the then resulting regions 28 ', 30' of different size on the liquid crystal matrix element regions are then imaged by the projection optics so that their images 28 ", 30" in the illumination zone merge into each other in a positionally overlapping manner.
  • the degree of polarization of this light distribution by electronic control of the pixels of the liquid crystal matrix element areas are adjusted. If, for example, the pixels of one of the two liquid-crystal matrix element regions 28, 30 are switched such that the light reflected by them is not directed by the beam splitter to the projection optics, then a nearly one hundred percent polarized light distribution results from the respective other of the two liquid-crystal matrix element regions.
  • the embodiment of the FIG. 3 requires a deflection mirror 39 between one of the two liquid crystal matrix element regions 28, 30 and the beam splitter 26.
  • this principal disadvantage has the advantage that this embodiment does not require two different liquid crystal matrix element region components since the liquid crystal matrix element regions are arranged here in a single plane and therefore can be realized as subregions of a single liquid crystal matrix element area component.
  • the different magnification factors which result in this example from the different optical path lengths between the projection optics 32 on the one side and one of the two liquid crystal matrix element regions 28, 30 on the other side can be achieved by arranging the two liquid crystal matrix element regions 28, 30 in mutually offset planes be avoided.
  • the two liquid-crystal element regions are arranged in different planes with pixel surfaces arranged parallel to one another. It is preferred that a perpendicular to the Pixel surface lying distance between the two liquid crystal element areas is the same as an average distance of the deflecting mirror 39 from the beam splitter 26.
  • the pixel surfaces of the liquid crystal matrix element areas are then offset in the z-direction just offset so far that the optical path lengths of the reflected light there are the same. In this determination of the distance then the two liquid crystal element regions are equidistant from the projection lens. As a result, both areas are imaged by the projection optics 32 with the same magnification factor in the front of the headlight illumination zone.
  • this embodiment then requires two different liquid crystal matrix element region components, since the liquid crystal matrix element regions are not arranged in a single plane and therefore can not be realized as partial regions of a single liquid crystal matrix element region component.
  • the projection optics 32 is a projection lens, which is represented in these figures by its main plane shown in dashed lines.
  • FIG. 5 shows an embodiment in which instead of the projection lens, a reflector 40 is used as projection optics 32.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP17156657.3A 2016-02-19 2017-02-17 Phare de véhicule automobile comprenant un affichage à cristaux liquides Active EP3208531B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016102991.2A DE102016102991A1 (de) 2016-02-19 2016-02-19 Kraftfahrzeug-Scheinwerfer mit einem Flüssigkristalldisplay

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EP3208531A2 true EP3208531A2 (fr) 2017-08-23
EP3208531A3 EP3208531A3 (fr) 2017-10-25
EP3208531B1 EP3208531B1 (fr) 2020-04-01

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EP3547009A1 (fr) * 2018-03-29 2019-10-02 Valeo Vision Dispositif de signalisation lumineuse avec ecran lcd
FR3079599A1 (fr) * 2018-03-29 2019-10-04 Valeo Vision Dispositif de signalisation lumineuse avec ecran lcd
CN110332499A (zh) * 2018-03-29 2019-10-15 法雷奥照明公司 具有液晶显示器的发光信号装置
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CN112415738A (zh) * 2020-02-24 2021-02-26 谷歌有限责任公司 可编程注入器栅格板
CN112415738B (zh) * 2020-02-24 2023-07-18 谷歌有限责任公司 可编程注入器栅格板
US11880030B2 (en) 2020-02-24 2024-01-23 Google Llc Programmable injector grid plate

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