EP3857618A1 - Source lumineuse matricielle pour un vehicule automobile - Google Patents
Source lumineuse matricielle pour un vehicule automobileInfo
- Publication number
- EP3857618A1 EP3857618A1 EP19772771.2A EP19772771A EP3857618A1 EP 3857618 A1 EP3857618 A1 EP 3857618A1 EP 19772771 A EP19772771 A EP 19772771A EP 3857618 A1 EP3857618 A1 EP 3857618A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light source
- elementary
- delay
- matrix
- light
- 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
-
- 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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
-
- 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
-
- 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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/16—Controlling the light source by timing means
-
- 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]
- H05B45/10—Controlling the intensity of the light
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Definitions
- the invention relates to matrix light sources with electroluminescent semiconductor elements, in particular for motor vehicles.
- the invention relates to a matrix light source whose electrical consumption is not likely to present peaks of electric current.
- a light emitting diode is a semiconductor electronic component capable of emitting light when it is traversed by an electric current.
- LED technology is increasingly used for various light signaling solutions. LEDs are used to perform light functions such as daytime running lights, signaling lights, etc.
- the light intensity emitted by an LED is generally dependent on the intensity of the electric current flowing through it.
- an LED is characterized by an electric current intensity threshold value. This maximum forward current is generally decreasing at increasing temperature.
- forward voltage direct or nominal voltage
- elementary light emitting is interesting in many fields of application, and in particular also in the field of lighting and signaling of motor vehicles.
- an array of LEDs can be used to create interesting light beam shapes for light functions such as high beam or daytime running light.
- several different light functions can be performed using a single matrix, thereby reducing the physical size in the confined space of a motor vehicle light.
- matrix light sources or, equivalently, pixelated are controlled by a physically remote control unit and electrically connected to the light source.
- the elementary light sources, or, equivalently, pixels which constitute a matrix light source extend over very limited dimensions, of the order of 50 to 200 ⁇ m each, and each of them consumes only a weak current. intensity, of the order of 10 mA when it is on.
- intensity of the order of 10 mA when it is on.
- a peak of high intensity global current is consumed at the level of the matrix light source: the electric current consumed by an elementary light source is multiplied by the number of pixels. For matrix sources at 256 pixels, a consumption peak of the order of 2.5 A can be observed.
- the invention aims to overcome at least one of the problems posed by the prior art. More specifically, the invention aims to provide a matrix or pixelated light source whose consumption of electric current at the time of switching on of its pixels is reduced.
- a matrix light source comprising an integrated circuit and a matrix of elementary light sources with an electroluminescent semiconductor element.
- the matrix light source is remarkable in that the integrated circuit is in contact with the matrix and comprises, for each of at least one set of elementary light sources, a delay unit configured to delay the ignition of the elementary source following the reception of an ignition command for said set of elementary light sources.
- an integrated circuit for a matrix light source is proposed.
- the integrated circuit is intended to be in mechanical and electrical contact with a matrix of elementary light sources of the matrix light source.
- the integrated circuit is remarkable in that it comprises, for each of at least one set of elementary light sources, a delay unit configured to delay the ignition of the elementary source by a predetermined duration following the reception of an ignition control for said set of elementary light sources.
- the matrix of elementary light sources may preferably comprise a common substrate supporting the elementary light sources.
- the common matrix substrate may preferably include SiC.
- the integrated circuit may preferably comprise an Si substrate.
- the integrated circuit is welded or glued to the matrix of elementary light sources, for example to a common substrate supporting the elementary light sources.
- the integrated circuit is preferably soldered or glued to the underside of the common substrate, opposite the face which comprises the elementary light sources.
- the integrated circuit is in mechanical contact, for example by means of fixing, and electrical contact with the common substrate, which has electrical connection zones on its underside.
- the delay unit of each elementary light source of the assembly can be functionally connected to the delay unit of another elementary light source of the assembly, the arrangement being such as the delay for the second elementary light source only begins to flow after the delay of the first elementary light source has elapsed.
- the delay unit of each elementary light source may preferably include a trigger circuit for sending a trip signal to the light source which is connected thereto, after the expiration of its own delay.
- the delay for each elementary light source in the set can be identical.
- the delay unit may preferably include a memory element for recording a delay value.
- the delay units of the elementary light sources of the assembly can preferably be linked functionally sequentially to form a chain.
- said set of light sources can comprise all the elementary light sources of the matrix light source.
- the delay unit may preferably include a delay line.
- the delay lines associated with all the elementary light sources can be clocked by means of the same clock signal.
- a light module for a motor vehicle comprises a matrix light source and a circuit for controlling the electrical supply of said source.
- the light module is remarkable in that the matrix light source conforms to one aspect of the invention.
- the pixelated light source may preferably comprise at least one matrix of electroluminescent elements - elementary light sources - (called in English monolithic array) arranged in at least two columns by at least two lines.
- the electroluminescent source comprises at least one matrix of monolithic electroluminescent elements, also called monolithic matrix.
- the electroluminescent elements are grown from a common substrate and are electrically connected so as to be selectively activatable, individually or by subset of electroluminescent elements.
- each electroluminescent element or group of electroluminescent elements can form one of the elementary emitters of said pixelated light source which can emit light when its or their material is supplied with electricity
- electroluminescent elements can meet this definition of monolithic matrix, since the electroluminescent elements have one of their main elongation dimensions substantially perpendicular to a common substrate and that the spacing between the elementary emitters, formed by one or more electroluminescent elements grouped together electrically, is low in comparison with the spacings imposed in known arrangements of flat square chips soldered on a printed circuit board.
- the substrate can be predominantly made of semiconductor material.
- the substrate may include one or more other materials, for example non-semiconductors.
- These electroluminescent elements are for example arranged projecting from the substrate so as to form rods of hexagonal section.
- the light-emitting sticks are born on a first face of a substrate.
- Each electroluminescent rod here formed by the use of gallium nitride (GaN), extends perpendicularly, or substantially perpendicularly, projecting from the substrate, here made from silicon, other materials such as silicon carbide which can be used without get out of the context of the invention.
- GaN gallium nitride
- the light-emitting sticks could be made from an alloy of aluminum nitride and gallium nitride (AlGaN), or from an alloy of aluminum phosphides, indium and gallium (AlInGaP).
- AlGaN aluminum nitride and gallium nitride
- AlInGaP aluminum phosphides, indium and gallium
- Each electroluminescent rod extends along an elongation axis defining its height, the base of each rod being arranged in a plane of the upper face of the substrate.
- the light-emitting sticks of the same monolithic matrix advantageously have the same shape and the same dimensions. They are each delimited by a terminal face and by a circumferential wall which extends along the axis of elongation of the rod.
- the light-emitting rods are doped and are the subject of a polarization, the resulting light at the output of the semiconductor source is emitted essentially from the circumferential wall, it being understood that light rays can also emerge from the face terminal.
- each light-emitting stick acts as a single light-emitting diode and the luminance of this source is improved on the one hand by the density of the light-emitting sticks present and on the other hand by the size of the illuminating surface defined by the circumferential wall. and which therefore extends over the entire periphery, and the entire height, of the stick.
- the height of a stick can be included between 2 and 10 mhi, preferably 8 m m.
- the largest dimension of the end face of a stick is less than 2 mm, preferably less than or equal to 1 m m.
- the height can be modified from one zone of the pixelated light source to another, so as to increase the luminance of the corresponding zone when the average height of the rods constituting it is increased.
- a group of light-emitting sticks can have a height, or heights, different from another group of light-emitting sticks, these two groups being constitutive of the same semiconductor light source comprising light-emitting sticks of submillimetric dimensions.
- the shape of the light-emitting rods can also vary from one monolithic matrix to another, in particular on the section of the rods and on the shape of the end face.
- the rods have a generally cylindrical shape, and they can in particular have a shape of polygonal section, and more particularly hexagonal. We understand that it is important that light can be emitted through the circumferential wall, whether it has a polygonal or circular shape.
- the end face may have a substantially planar shape and perpendicular to the circumferential wall, so that it extends substantially parallel to the upper face of the substrate, or it may have a domed or pointed shape at its center. , so as to multiply the directions of emission of the light leaving this end face.
- the light-emitting sticks can preferably be arranged in a two-dimensional matrix. This arrangement could be such that the sticks are staggered.
- the rods are arranged at regular intervals on the substrate and the separation distance of two immediately adjacent light-emitting rods, in each of the dimensions of the matrix, must be at least equal to 2 ⁇ m, preferably between 3 mm and 10 mm, so that the light emitted by the circumferential wall of each rod can exit the matrix of light-emitting rods.
- these separation distances measured between two axes of extension of adjacent rods, will not be greater than 100 ⁇ m.
- the monolithic matrix may comprise electroluminescent elements formed by layers of epitaxial electroluminescent elements, in particular a first layer of GaN doped n and a second layer of GaN doped p, on a single substrate, for example made of silicon carbide, and which is cut (by grinding and / or ablation) to form a plurality of elementary emitters respectively from the same substrate.
- electroluminescent elements formed by layers of epitaxial electroluminescent elements, in particular a first layer of GaN doped n and a second layer of GaN doped p, on a single substrate, for example made of silicon carbide, and which is cut (by grinding and / or ablation) to form a plurality of elementary emitters respectively from the same substrate.
- the result of such a design is a plurality of electroluminescent blocks all from the same substrate and electrically connected to be selectively activatable from each other.
- the substrate of the monolithic matrix may have a thickness of between 5 ⁇ m and 800 ⁇ m, in particular equal to 200 mhi; each block may have a length and a width, each being between 50 ⁇ m and 500 ⁇ m,
- each block is less than 500 ⁇ m, preferably less than 300 ⁇ m.
- each block can be made via the substrate on the side opposite the epitaxy.
- the separation distance between two elementary transmitters can be less than 1 mm, in particular less than 500 ⁇ m, and it is preferably less than 200 ⁇ m.
- the monolithic matrix may comprise further a layer of a polymeric material in which the electroluminescent elements are at least partially embedded.
- the layer can thus extend over the entire extent of the substrate or only around a determined group of electroluminescent elements.
- the polymer material which can in particular be based on silicone, creates a protective layer which makes it possible to protect the electroluminescent elements without hampering the diffusion of the light rays.
- wavelength conversion means capable of absorbing at least part of the rays emitted by one of the elements and of converting at least part of said excitation light absorbed into emission light having a wavelength different from that of the excitation light. It is equally possible to provide that the phosphors are embedded in the mass of the polymer material, or that they are arranged on the surface of the layer of this polymer material.
- the pixelated light source may further include a coating of reflective material to deflect the light rays towards the exit surfaces of the light source.
- the electroluminescent elements of submillimetric dimensions define in a plane, substantially parallel to the substrate, a determined outlet surface.
- a determined outlet surface is defined according to the number and arrangement of the elements
- the invention By using the measures proposed by the present invention, it becomes possible to propose a matrix or pixelated light source whose consumption of electric current at the time of switching on of its pixels is reduced.
- the invention By delaying the ignition potentially individually for each pixel, the invention is capable of smoothing over time the peak of current intensity which appears in known solutions at the time of ignition of the matrix light source. This smoothing of the consumption of electric current results in a reduction in electromagnetic radiation, which generates a reduced risk of electromagnetic interference at the level of other electronic components which are in the physical proximity of the matrix light source. As the delays for each pixel are nevertheless short, the effect of the delay is generally not or hardly visible.
- Figure 1 schematically shows a matrix light source according to a preferred embodiment of the invention
- Figure 2 shows schematically a matrix light source according to a preferred embodiment of the invention
- FIG. 3 shows timing diagrams indicating the ignition time per pixel following an ignition instruction received by a matrix light source according to, according to the prior art and according to a preferred embodiment of the invention
- Figure 4 schematically shows details of a matrix light source according to a preferred embodiment of the invention
- FIG. 5 shows timing diagrams indicating the ignition time per pixel following an ignition instruction received by a matrix light source according to preferred embodiments of the invention.
- references 100, 200 and 300 denote three embodiments of a matrix light source according to the invention.
- the illustration of Figure 1 shows a pixelated or matrix light source 100 according to a preferred embodiment of the invention.
- the matrix light source 100 comprises a plurality of elementary light sources with an electroluminescent semiconductor element 110 and a common substrate, not illustrated, in mechanical and electrical contact with, and functionally connected to a circuit. integrated 120.
- the elementary light sources are typically light-emitting diodes, LEDs.
- the matrix light source 100 preferably comprises a monolithic matrix component, in which the semiconductor layers of the elementary light sources 110 are, for example, arranged on the common substrate.
- the matrix of elementary light sources 110 preferably comprises a parallel mounting of a plurality of branches, each branch comprising light emitting semiconductor light sources 110.
- the matrix of elementary light sources comprises by way of example and without limitation, depending on the thickness of the substrate and starting at the end opposite to the location of the elementary sources 110, a first electrically conductive layer deposited on an electrically insulating substrate . It follows an n-doped semiconductor layer, the thickness of which is between 0.1 and 2 ⁇ m. This thickness is clearly less than that of known light-emitting diodes, for which the corresponding layer has a thickness of the order of 1 to 2 ⁇ m.
- the next layer is the active quantum well layer with a thickness of about 30 nm, followed by an electron blocking layer, and finally a p-doped semiconductor layer, the latter having a thickness of about 300nm.
- the first layer is a layer of (Al) GaN: Si
- the second layer a layer of n-GaN: Si
- the active layer comprises quantum wells in InGaN alternating with barriers in GaN.
- the blocking layer is preferably made of AlGaN: Mg and the p-doped layer is preferably made of p-GaN: Mg.
- the n-doped Galium nitride has a resistivity of 0.0005 Ohm / cm while the p-doped Galium nitride has a resistivity of 1 Ohm / cm.
- the thicknesses of the proposed layers make it possible in particular to increase the internal series resistance of the elementary source, while significantly reducing its manufacturing time, as the doped layer n is thinner compared to known LEDs and requires less deposition time important. For example, typically 5 hours of MOCVD deposition time is required for a standard configuration LED with 2p of layer n, and this time can be reduced by 50% if the thickness of layer n is reduced to 0.2 p.
- the monolithic component 100 is preferably manufactured by depositing the layers in a homogeneous and uniform manner on at least part of the surface of the substrate, so to cover it.
- the deposition of the layers is for example carried out by a process of epitaxy in the vapor phase with organometallics (“metal oxide Chemical vapor deposition”), MOCVD.
- organometallics metal oxide Chemical vapor deposition
- Such methods and reactors for their implementation are known for depositing semiconductor layers on a substrate, for example from patent documents WO 2010/072380 A1 or WO 01/46498 A1. The details of their implementation will therefore not be detailed in the context of the present invention.
- the layers thus formed are pixelated.
- the layers are removed by known lithographic methods and by etching at the locations which subsequently correspond to the spaces separating the elementary light sources 110 from one another on the substrate.
- a plurality of several tens or hundreds or thousands of pixels 110 of surface less than one square millimeter for each individual pixel, and of total surface greater than 2 square millimeter having semiconductor layers with homogeneous thicknesses, and therefore having homogeneous and high internal series resistances can be produced on the substrate of a matrix light source 100.
- the substrate comprising the epitaxial layers covering at least part of the surface of the substrate is sawn or cut into elementary light sources, each of the elementary light sources having similar characteristics in terms of their internal series resistance.
- the invention likewise relates to types of elementary light sources with semiconductor elements implying other configurations of semiconductor layers.
- the substrates, the semiconductor materials of the layers, the arrangement of the layers, their thicknesses and any vias between the layers may be different from the example which has just been described.
- the integrated circuit 120 is preferably soldered on the underside of the common substrate which houses the elementary light sources, so as to establish mechanical and electrical contact with the substrate and the elementary light sources.
- the integrated circuit further comprises for at least one, but preferably for all the elementary light sources 110, a delay unit 130 configured to delay the ignition of the elementary light source by a predetermined duration following the reception of a command. ignition 12, typically generated by a control unit external to the matrix light source 100.
- the delay unit 130 is for example produced by an electronic circuit which produces a delay line. Such electronic circuits are well known in the state of the art and their operation will not be described in detail in the context of the present invention.
- the delay produced for each of the elementary sources 110 is different, so that a control signal 12 intended at the same time for all the elementary sources 110 of the matrix source 100, is delayed differently for each, or the less for disjoint sets of elementary light sources.
- a control signal 12 intended at the same time for all the elementary sources 110 of the matrix source 100 is delayed differently for each, or the less for disjoint sets of elementary light sources.
- the ignition of the elementary light sources is potentially delayed individually for each elementary light source, this makes it possible to avoid a maximum single peak of the electrical consumption of the matrix light source 100 at the moment when the control signal 12 intervenes.
- the use of an integrated circuit 120 in mechanical and electrical contact with the substrate on which the elementary light sources reside makes it possible to dispense with wire connections, the number of which would be at least equal to the number of pixels of the matrix light source .
- the matrix light source can be controlled in voltage or electric current by a control circuit of the power supply.
- Such circuits are known per se in the art and their operation will not be described in detail in the context of the present invention. They involve at least one converter circuit capable of converting an input voltage / current, supplied for example by a voltage / current source internal to a motor vehicle, such as a battery, into an output voltage / current, of intensity adapted to supply the matrix light source.
- the control of each elementary source, or in an equivalent manner, of each pixel is reduced to the control of a switch device 132 as shown diagrammatically in FIG. 1.
- the elementary light source 110 can be selectively connected to the voltage source 10.
- the switching device is for example produced by a field effect transistor of MOSFET type preferably characterized by a drop of low voltage between its drain and source terminals, and controlled by the control signal 12 delayed by the delay unit 130.
- a supply circuit can be integrated into the substrate 120 during the manufacture of the monolithic component 100.
- the illustration of Figure 2 shows a pixelated or matrix light source 200 according to a preferred embodiment of the invention.
- the matrix light source 200 comprises a plurality of elementary light sources with an electroluminescent semiconductor element 210 and a common substrate not shown, in contact with and functionally connected to an integrated circuit 220
- the elementary light sources are typically light emitting diodes, LEDs.
- the matrix light source 200 is preferably a monolithic component, in which the semiconductor layers of the elementary light sources 210 are arranged on the common substrate.
- the matrix light source 200 preferably comprises a parallel mounting of a plurality of branches, each branch comprising light emitting semiconductor light sources 210.
- the integrated circuit 220 further comprises for at least one but preferably for all the elementary light sources 210, a delay unit 230 configured to delay the ignition of the elementary light source by a predetermined duration following the reception of a ignition control 12, preferably binary, typically generated by a control unit external to the matrix light source 200.
- the delay unit 230 is for example produced by an electronic circuit which produces a delay line.
- the matrix light source can be controlled in voltage or electric current by a control circuit of the power supply.
- the control of a switch device 232 makes it possible to selectively supply the elementary light source 210 with electricity. In the embodiment illustrated in FIG. 2, this control is carried out by the delay unit 230, which reproduces a delayed version of the control signal 12.
- the delay units 230 associated with different elementary light sources 210 are connected, from preferably along a chain, between them by an electrical connection 231. When the delay for an elementary light source (left) has elapsed, the delay unit 230 (left) controls the switch device 232 so as to supply the light source elementary 210 (left) in electricity.
- the delay unit 230 (left) transmits an "enable" trigger signal, for example a binary signal, to the homologous delay unit 230 (right) associated with the elementary light source 210 (right). It is only on receipt of this "enable" signal from the delay unit (left) that the delay unit 230 (right) begins to count down its predetermined delay.
- the delay unit 230 (right) controls the switch device 232 so as to supply the elementary light source 210 (right) with electricity. Even if the two delay units are configured to implement a countdown of a similar duration, it follows that the effective delays are different for the two elementary light sources, since the delays between connected delay units accumulate.
- the effective delay is twice the effective delay of the delay unit 230 (left).
- the delay units are clocked by a regular clock signal not shown. As the ignition of the elementary light sources forming part of the chain which connects their respective delay units is delayed individually for each elementary light source, this makes it possible to avoid a single maximum peak of the electrical consumption of the matrix light source 200 when the control signal 12 intervenes.
- FIG. 3 shows the evolution over time of a regular binary clock signal which is used to clock the delay units 230 of FIG. 2.
- the ignition time for three pixels is shown using a matrix source known from the state of the art: the pixels indicated by nl, n and n + 1 are supplied with electricity at the same instant, corresponding to the reception of the ignition instruction 12.
- the ignition time for three pixels using a matrix source according to the embodiment of the figure is illustrated.
- the delay units of each of the pixels nl, n and n + 1 are functionally linked together so that the delay of the pixel n only begins to elapse once the delay of the delay of the pixel nl s 'is completed, and so on.
- each delay unit implements an identical delay of one clock cycle.
- the delay units are synchronized with respect to the rising edge of the clock signal, without this being a limitation of the invention.
- the delay units can also be synchronized with respect to the rising edge of the clock signal, or even with respect to a predetermined point in the cycle of the clock signal.
- the illustration of Figure 4 shows details of an integrated circuit of a pixelated or matrix light source 300 according to a preferred embodiment of the invention.
- the matrix light source 300 comprises a plurality of elementary light sources with an electroluminescent semiconductor element 310 and a common substrate, not shown, in contact with and functionally connected to the integrated circuit.
- the elementary light sources are typically diodes
- the integrated circuit further comprises for at least one, but preferably for all the elementary light sources, a delay unit 330 configured to delay the ignition of the elementary light source by a predetermined duration following the reception of a command d ignition 12, preferably binary, typically generated by a control unit external to the matrix light source 300.
- the delay units 30 of the elementary light sources are interconnected as for the embodiment described in connection with FIG. 2, and clocked by a common regular binary clock signal 14.
- a delay unit 330 comprises a logic unit 333 produced for example by a comparison circuit.
- the logic unit 333 compares the control signal 12 with a status signal generated by a downcount unit 334.
- the status signal is for example zero when the delay has not yet elapsed, and the signal switches to a non-zero value when the delay has passed. If the two signals have a non-zero value, the resulting trigger signal 331 is non-zero. 11 then relays the control signal to the delay unit 330 (right), to trigger the respective delay there.
- the down-counting unit 334 comprises for example a down-counting circuit, configured to read the value of the delay to be counted down from a memory element or register 336 of the integrated circuit.
- the delay unit 330 controls the device 332 so as to supply the light source 310 associated therewith with electricity.
- the use of a memory element 336 to record the respective delay of each elementary light source allows increased flexibility. Different delays can be recorded for different elementary light sources, and the recorded values can be changed by writing instructions to the respective memory elements 336 over time. Obviously, the effective delays for each light source also depend on the frequency of the clock signal 14.
- the integrated circuit may include additional electronic circuits indicated by the hatched area of FIG. 4. It may in particular be a circuit performing diagnostic functions of the operation of the elementary light source.
- FIG. 5 shows the evolution over time of a regular binary clock signal which is used to clock the delay units 430 of FIG. 3.
- the ignition time for a pixel nl is shown using a matrix source known from the state of the art: the indicated pixel is supplied with electricity upon reception of the ignition instruction 12.
- the ignition time for two pixels using a source matrix according to the embodiment of Figure 4 is illustrated.
- the delay units of each of the pixels n and n + 1 are functionally linked together so that the delay of the pixel n + 1 only begins to elapse once the delay of the pixel n s has elapsed 'is completed.
- the pixel n delay unit performs a delay of four clock cycles, while the pixel n + 1 delay unit performs a delay of two clock cycles, which begins only at elapse once the pixel delay n has elapsed.
- the effective delays can also be modified by modifying the frequency of the clock signal. In the example shown, the frequency of the signal is doubled compared to the example shown in the middle of the figure.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- General Engineering & Computer Science (AREA)
- Led Devices (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Electroluminescent Light Sources (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1859029A FR3086726B1 (fr) | 2018-09-28 | 2018-09-28 | Source lumineuse matricielle pour un vehicule automobile |
PCT/EP2019/075947 WO2020064886A1 (fr) | 2018-09-28 | 2019-09-25 | Source lumineuse matricielle pour un vehicule automobile |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3857618A1 true EP3857618A1 (fr) | 2021-08-04 |
Family
ID=65244029
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19772771.2A Pending EP3857618A1 (fr) | 2018-09-28 | 2019-09-25 | Source lumineuse matricielle pour un vehicule automobile |
Country Status (6)
Country | Link |
---|---|
US (1) | US11903111B2 (fr) |
EP (1) | EP3857618A1 (fr) |
JP (1) | JP2022503843A (fr) |
CN (1) | CN112789951A (fr) |
FR (1) | FR3086726B1 (fr) |
WO (1) | WO2020064886A1 (fr) |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4809562B2 (ja) | 1999-12-22 | 2011-11-09 | アイクストロン、アーゲー | 化学気相成膜反応室 |
JP3570394B2 (ja) | 2001-05-25 | 2004-09-29 | ソニー株式会社 | アクティブマトリクス型表示装置およびアクティブマトリクス型有機エレクトロルミネッセンス表示装置、並びにそれらの駆動方法 |
US7671542B2 (en) * | 2007-11-07 | 2010-03-02 | Au Optronics Corporation | Color control of multi-zone LED backlight |
DE102008055582A1 (de) | 2008-12-23 | 2010-06-24 | Aixtron Ag | MOCVD-Reaktor mit zylindrischem Gaseinlassorgan |
JP2012163581A (ja) | 2009-06-19 | 2012-08-30 | Sharp Corp | 表示装置 |
CN101916542B (zh) | 2010-01-05 | 2013-06-12 | 利亚德光电股份有限公司 | Led面板电视图像显示装置 |
CN102354484B (zh) * | 2011-09-20 | 2014-04-30 | 深圳市华星光电技术有限公司 | Led调光驱动装置、方法及液晶显示器 |
EP2805577A1 (fr) * | 2012-01-20 | 2014-11-26 | Osram Sylvania Inc. | Systèmes d'éclairage présentant une luminosité de del uniforme |
US9253850B2 (en) | 2012-05-22 | 2016-02-02 | Texas Instruments Incorporated | LED bypass and control circuit for fault tolerant LED systems |
TWI587737B (zh) | 2016-01-21 | 2017-06-11 | 隆達電子股份有限公司 | 調光模組以及固態光源裝置 |
US9661708B1 (en) | 2016-09-08 | 2017-05-23 | Infineon Technologies Ag | Driving several light sources |
US10206252B2 (en) * | 2016-09-08 | 2019-02-12 | Infineon Technologies Ag | Driving several light sources |
US9918367B1 (en) * | 2016-11-18 | 2018-03-13 | Infineon Technologies Ag | Current source regulation |
-
2018
- 2018-09-28 FR FR1859029A patent/FR3086726B1/fr active Active
-
2019
- 2019-09-25 WO PCT/EP2019/075947 patent/WO2020064886A1/fr unknown
- 2019-09-25 CN CN201980064243.2A patent/CN112789951A/zh active Pending
- 2019-09-25 EP EP19772771.2A patent/EP3857618A1/fr active Pending
- 2019-09-25 JP JP2021517396A patent/JP2022503843A/ja active Pending
- 2019-09-25 US US17/280,475 patent/US11903111B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US20210360759A1 (en) | 2021-11-18 |
JP2022503843A (ja) | 2022-01-12 |
FR3086726B1 (fr) | 2021-05-07 |
US11903111B2 (en) | 2024-02-13 |
CN112789951A (zh) | 2021-05-11 |
FR3086726A1 (fr) | 2020-04-03 |
WO2020064886A1 (fr) | 2020-04-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5409366B2 (ja) | Led半導体ボディ | |
US8946761B2 (en) | Radiation-emitting semiconductor chip and method for producing a radiation-emitting semiconductor chip | |
FR3030995A1 (fr) | Source de lumiere electroluminescente a parametre de luminance ajuste ou ajustable en luminance et procede d'ajustement d'un parametre de luminance de la source de lumiere electroluminescente | |
EP3592113B1 (fr) | Système de pilotage de l'alimentation électrique d'une source lumineuse pixellisée | |
EP3364340B1 (fr) | Capteur d'empreinte a led au nitrure de gallium | |
EP3878242A1 (fr) | Dispositif lumineux pour un vehicule automobile comprenant une source lumineuse matricielle | |
EP3350845A1 (fr) | Source lumineuse led a micro- ou nano-fils comprenant des moyens de mesure de la temperature | |
WO2020064824A1 (fr) | Source lumineuse matricielle pilotee en tension a circuit diagnostic pour un vehicule automobile | |
EP3857618A1 (fr) | Source lumineuse matricielle pour un vehicule automobile | |
WO2020064823A1 (fr) | Source lumineuse matricielle a gradation de l'intensite lumineuse | |
EP3823859A1 (fr) | Dispositif lumineux matriciel avec estimation de temps de vol | |
WO2020064627A1 (fr) | Source lumineuse matricielle a circuit diagnostic pour un vehicule automobile | |
WO2020078828A1 (fr) | Source lumineuse matricielle a architecture ajustable | |
FR3128351A1 (fr) | Source lumineuse matricielle pour un vehicule automobile | |
FR3056014A1 (fr) | Procede pour creer une isolation optique entre des pixels d'une matrice de sources lumineuses semi-conductrices | |
EP3267767B1 (fr) | Dispositif d'eclairage et/ou signalisation avec effet de defilement | |
WO2017001760A1 (fr) | Dispositif electroluminescent a semiconducteur comportant une couche photoluminescente structuree | |
FR3055949B1 (fr) | Connexion thermique pour module lumineux | |
FR3082662A1 (fr) | Procédé de fabrication d’un dispositif optoélectronique à parois de confinement lumineux auto alignés | |
WO2018122188A1 (fr) | Structure electronique comprenant une matrice de dispositifs electroniques presentant des performances thermiques ameliorees | |
FR3063129A1 (fr) | Module lumineux a encombrement reduit |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20210426 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20230504 |
|
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230528 |