Light-emitting assembly, indicator device, headlight of a motor vehicle and method for operating a light-emitting assembly

Abstract

Light-emitting assembly (20), with at least one first laser light source (22) for generating a first laser beam (32) and at least one second laser light source (24) for generating a second laser beam (34), a translucent scattering body (28) which is arranged in the beam path of the first and second laser beams (32, 34) and at a predetermined distance greater than zero from the first and second laser light sources (22, 24) and which is designed to scatter light of the first laser beam (32) such that a wavelength of a first scattered light (38, 90) is equal to a wavelength of the light of the first laser beam (32), and to scatter light of the second laser beam (34) such that a wavelength of a second scattered light (38, 90) is equal to a wavelength of the light of the second laser beam (34), further comprising one or more dynamically adjustable mirrors (72, 74) which are arranged in a beam path of the first and in a beam path of the second laser beam (32, 34) in front of the scattering body (28) and are designed such that the laser beams (32, 34) can be directed onto the scattering body (28) and positions at which the laser beams strike the scattering body (28) can be changed.

Description

[0001] The invention relates to a light-emitting assembly, a display device, a headlight of a motor vehicle and a method for operating a light-emitting assembly.

[0002] The digitalization and networking of lighting components is leading to new possibilities, such as the control of brightness and / or light color depending on the time of day and / or the presence of one or more people. Furthermore, the modulation of light can be used to transmit data and / or determine a user's location. Dimming and light modulation are very active areas of research and development, and a lot of time and resources are invested in them. The control of light color is also currently a very active area of ​​research. Furthermore, the controllability of light, i.e. the targeted modification of the far field of a light source, plays an important role.The controllability includes, for example, a changeable angle of the light source, a changeable orientation of the corresponding light beam and / or a complex, freely selectable far-field distribution of the corresponding light source within the scope of the possibilities of the lighting unit.

[0003] Light sources with a variable far field are particularly well known in stage lighting. Large mechanical parts are usually moved to create the change in the far field.

[0004] For example, with so-called moving heads, the entire lighting unit is moved by a motorized unit, such as a gimbal. This allows different beam directions to be adjusted sequentially. The speed of movement is limited by the mass of the device. Furthermore, there is a relatively high level of noise, the movement is slow, large moving parts are freely accessible, and motors and heavy, moving mechanical parts limit the lifespan.

[0005] Mechanically adjustable optics are also known in lighting technology. Similar to imaging optics, such as a camera with a zoom lens, lighting technology also features movable optical elements, such as lenses and mirrors, that can change the direction or angle of the beam. However, the travel distances here are also relatively large, resulting in similar disadvantages as with moving heads.

[0006] A recent development involves a device with 61 high-performance LEDs arranged in a hemisphere, each with a highly focusing lens. This allows electronic control of which of the 61 LEDs emit light. However, it is not possible to direct a high level of illuminance in a specific direction in the room, as only one of the LEDs points in a specific direction. This limits the ability to fill the room with light while simultaneously strongly highlighting certain points. The beam angle can only be changed digitally, i.e. by switching individual LEDs on or off, and the beam direction can only be changed by switching LEDs on or off in discrete steps.

[0007] LARP (laser activated remote phosphor) light sources are also known, such as those currently being developed for the automotive sector, particularly for headlights. Here, blue laser excitation radiation is scanned as pump radiation via a conversion element, in particular a conversion ceramic, which converts parts of the blue light into white light. Such a conversion element can also be referred to as a converter element. The resulting white light can be projected onto the road via an imaging optical system, whereby the far field generated can be static (e.g., in the "Laser Headlamp") or dynamic (e.g., in the "AFS Laser Headlamp System"). The luminance and the total luminous flux are limited here due to the strong heating of the conversion element due to Stokes losses. Furthermore, the conversion efficiency drops significantly above 200°C. Thus, around 20% of the blue pump light is converted directly into heat.

[0008] US 2015 / 0 062 903 A1 relates to a light-emitting assembly and a projection system comprising a coherent light source, a diffusion element configured to convert coherent light into incoherent light, and a light-conducting element configured to separate the coherent light from the incoherent light.

[0009] US 2011 / 0 044 070 A1 relates to an arrangement for generating light comprising two semiconductor lasers which generate light of different colors, and a scattering body which is illuminated by the two semiconductor lasers and scatters their light without changing the wavelength of the light of the two semiconductor lasers.

[0010] DE 10 2013 226 614 A1 relates to a lighting device in which laser light can be projected onto a body at a variable position, comprising a laser light source arrangement, an optical system, at least one pivotable mirror, and at least one light wave conversion element. The optical system and / or the pivotable mirror are configured to compensate for the lengthening or shortening of the optical path of the projected light of the lighting device caused by the pivoting movement. One object of the invention is to provide a light-emitting assembly that enables controllability, in particular a change in the far field, of the emitted light and / or the emission of light with a particularly high light intensity, and / or that can be used for general lighting.

[0011] An object of the invention is to provide a display device which enables the display of one or more images or a video at a particularly high light intensity.

[0012] An object of the invention is to provide a headlight for a motor vehicle whose light distribution in the far field is variable and / or which enables the emission of light with a particularly high light intensity.

[0013] An object of the invention is to provide a method for operating a light-emitting assembly which enables controllability, in particular a change of the far field, of the emitted light at a high light intensity.

[0014] The objects are achieved by the light-emitting assembly, the display device, the headlight, and the method having the features of the independent claims. Preferred embodiments are specified in dependent claims.

[0015] The light-emitting assembly comprises at least a first laser light source for generating a first laser beam, at least one second laser light source for generating a second laser beam, and a translucent scattering body which is arranged in the beam path of the first and second laser beams and at a predetermined distance greater than zero from the first and second laser light sources and which is designed such that it scatters light of the first laser beam such that a wavelength of a first scattered light is equal to a wavelength of the light of the first laser beam, and that it scatters light of the second laser beam such that a wavelength of a second scattered light is equal to a wavelength of the light of the second laser beam.The assembly (20) further comprises one or more dynamically adjustable mirrors which are arranged in front of the scattering body in a beam path of the first and in a beam path of the second laser beam and are designed such that the laser beams can be directed onto the scattering body and positions at which the laser beams strike the scattering body can be changed.

[0016] The scattering body breaks the coherence of the first and second laser beams and converts the linear light distribution of the first and second laser beams into a Gaussian light distribution, specifically a Lambertian light distribution. Although the scattering body reduces the luminance of the laser light by several orders of magnitude, the light-emitting assembly still represents a light source with extremely high luminance for illumination purposes.

[0017] For example, laser radiation can in principle be focused to spot sizes of a few micrometers. However, scattering in the scattering body results in a Lambertian radiator with diameters in the range of a few hundred micrometers. However, a normal LED or incandescent filament has a luminance of only approximately 50 MCd / m². 2 up to 100 MCd / m 2 and if laser radiation of 10W is focused on an area of ​​500 µm diameter, the result is a luminance of approximately 5000 MCd / m 2 .

[0018] The achievable luminance is determined by the destruction threshold of the diffuser. However, since the diffuser does not convert the light of the first and second laser beams, unlike in a conventional LARP application, and in particular because it is free of converter material, the diffuser absorbs significantly less of the light hitting it than a conversion element in a LARP application, for example, which is why the diffuser heats up significantly less than such a conversion element. In particular, the diffuser is designed such that it does not absorb the laser radiation used. This makes it possible to generate a luminance and / or luminous flux using the light-emitting assembly that is, for example, a factor of 20 greater than in a conventional LARP application.

[0019] In principle, any white-scattering body with sufficiently low absorption that it is not overheated and destroyed by unintentionally absorbed laser radiation can be used as a material for the scattering body.

[0020] According to a further development, the light-emitting assembly has an optic that is configured and arranged to project the first and second scattered light.

[0021] The light-emitting assembly includes a second laser light source for generating a second laser beam and, optionally, a third laser light source for generating a third laser beam. This allows the light of the laser beams to be mixed by means of scattering in the scattering body, thereby generating light of a specific color or white light, and / or generating light with a particularly high luminance.

[0022] According to a further development, the light of the second laser beam has a different wavelength than the light of the first laser beam.

[0023] According to a further development, the light of the second laser beam has a different wavelength than the light of the first laser beam, and the light of the third laser beam has a different wavelength than the light of the first laser beam and the light of the second laser beam. The three laser beams in the three corresponding laser colors are combined to form a powerful radiation source with one light color, for example white, by directing the three laser colors onto the scattering body and mixing the light of the different laser colors in the scattering body due to scattering. For example, the three laser colors are combined at one position on or in the scattering body, creating a light source, for example a white light source, with particularly high luminance.

[0024] According to a further development, the light of the first laser beam is red light, the light of the second laser beam is yellow light, and the light of the third laser beam is blue light. By appropriately composing the three primary colors, the color location within the defined color triangle can be changed and / or adjusted by appropriately controlling the laser light sources.

[0025] According to a further development, the scattering body has a first side that serves as a light entry surface, and a second side facing away from the first side that serves as a light exit surface, so that the light of the corresponding laser beam enters the scattering body on the first side and exits the scattering body on the second side. In this transmissive configuration, the laser light sources are mounted in a half-space delimited by the scattering body, and the scattered light is essentially emitted into the other half-space beyond the scattering body. One or more imaging optics can then be mounted in the other half-space.

[0026] The diffuser can be attached to lateral surfaces connecting the first and second sides by means of a mount. The heat generated in the diffuser during operation can be dissipated by means of the mount.

[0027] According to a further development, the diffuser has a first side that serves as a light entry surface and a light exit surface, so that the light of the corresponding laser beam enters and exits the diffuser on the first side. In this reflective configuration, the laser light sources and, if applicable, further imaging optics are mounted in the same half-space delimited by the diffuser. Advantages of this configuration include the fact that almost all of the generated light can be emitted in the desired direction, and the cooling can be particularly well-designed, since the entire rear side of the diffuser can be coupled to a corresponding mount that serves as a heat sink.

[0028] According to a further development, a mirror surface is formed behind the diffuser in the beam direction of the corresponding laser beam. The mirror surface can be formed, for example, on a rear side of the diffuser or on a front side of a corresponding holder on the rear side of the diffuser, facing the diffuser. The mirror surface increases the proportion of reflected and scattered light and thus the efficiency of the light-emitting assembly.

[0029] According to a further development, a dielectric is formed between the scattering body and the mirror surface. The dielectric can, for example, contribute to forming a planar surface toward the rear side of the scattering body and / or, if appropriate, toward the front side of the holder and / or improve the optical coupling of the mirror surface to the scattering body.

[0030] According to a further development, a collimating lens is arranged in the beam path of the corresponding laser beam between the laser light source and the scattering body, which collimates the light of the corresponding laser beam. This can help ensure that the laser light has a suitable beam diameter when it hits the scattering body.

[0031] According to a further development, the laser beams are moved back and forth on the diffuser using the corresponding mirrors, creating a white or colored image depending on the colors of the laser beams and the color mixture. By dynamically adjusting the mirror(s) during operation of the light-emitting module and using a downstream wide-angle lens, any white or colored light distribution can be projected into the room. Highlights and / or spots with the full luminance of the system can be set at any location, and background lighting can also be flexibly implemented. In particular, one or more lettering, one or more graphics and / or one or more images, for example a film or video, can be generated on the diffuser, allowing the diffuser to be used as a display.The lettering, graphics and / or images or videos generated on the diffuser can be projected into the room using a wide-angle lens, allowing the light-emitting assembly to be used as a projector.

[0032] According to a further development, the mirror is part of a micromirror system. The micromirror system enables the laser beam(s) to be moved across the scattering body in a particularly simple and precise manner.

[0033] The display device comprises the light-emitting assembly explained above. The display device can be, for example, the display or the projector.

[0034] The headlight of a motor vehicle has the light-emitting assembly described above. Using the light-emitting assembly, the light emitted by the headlight can be dynamically adjusted depending on the driving situation, for example, depending on the speed and / or a section of road ahead of the motor vehicle in the direction of travel, such as a curve, and / or depending on a driver request, such as the desire for low beam or high beam.

[0035] In the method for operating a light-emitting assembly: at least a first laser beam and at least a second laser beam are generated and radiated onto one or more dynamically adjustable mirrors; the first laser beam and the second laser beam are reflected onto a translucent scattering body by means of the dynamically adjustable mirrors; the light of the reflected first laser beam is scattered by the scattering body such that the wavelength of a first scattered light is equal to the wavelength of the light of the first laser beam; light of the reflected second laser beam is scattered by the scattering body such that a wavelength of a second scattered light is equal to a wavelength of the light of the second laser beam; and positions at which the first laser beam and the second laser beam enter the scattering body are changed by means of the dynamically adjustable mirrors.

[0036] The advantages and embodiments of the light-emitting assembly explained above can be readily applied to the method for operating the light-emitting assembly. In particular, the method for operating the light-emitting assembly is advantageous when it is part of the display device, for example, the display or projector, or the headlight.

[0037] Embodiments of the invention are illustrated in the figures and are explained in more detail below.

[0038] They show: Fig. 1 is a schematic representation of a light-emitting assembly which is not part of the invention; Fig. 2 is a schematic representation of a light-emitting assembly which is not part of the invention; Fig. 3 a schematic representation of an embodiment of a light-emitting assembly; Fig. 4 is a schematic representation of a light-emitting assembly which is not part of the invention; Fig. 5 a flowchart of an embodiment of a method for operating a light-emitting assembly.

[0039] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. Since components of embodiments may be positioned in a number of different orientations, identical or similar elements are designated by identical reference numerals throughout the figures where appropriate.

[0040] A light-emitting assembly comprises two or more laser light sources and a diffuser. Optionally, a light-emitting assembly can also comprise one, two, or more electronic components. An electronic component can, for example, comprise an active and / or a passive component. An active electronic component can, for example, comprise a computing, control, and / or regulating unit and / or a transistor. A passive electronic component can, for example, comprise a capacitor, a resistor, a diode, or a coil.

[0041] Fig. Figure 1 shows, particularly on the left side, a schematic representation of a light-emitting assembly 20, which is not part of the invention. The light-emitting assembly 20 has a diffuser 28 and a first laser light source 22, a second laser light source 24, and a third laser light source 26. The first laser light source 22 generates a first laser beam 32, the second laser light source 24 generates a second laser beam 34, and the third laser light source 26 generates a third laser beam 36. The first laser beam 32 comprises red light, the second laser beam 34 comprises green light, and the third laser beam 36 comprises blue light.

[0042] The laser light sources 22, 24, 46 are each high-power solid-state lasers. The first laser light source 22 for generating the red first laser beam 32 has at least one laser diode made of the AlGaInP material system that emits red light, for example, in a wavelength range around 630 nm. The second laser light source 24 for generating the green second laser beam 34 emits green light, for example, in the wavelength range around 532 nm, and has at least one electromagnetic radiation-emitting diode that can emit the electromagnetic radiation, for example, at twice the wavelength, for example, at 1064 nm, for example, a pumped, frequency-doubled Nd:YAG laser. The third laser light source 24 for generating the blue third laser beam 36 has at least one GaN laser diode that emits blue light, for example, around 450 nm.Alternatively, the laser light sources 22, 24, 26 may be formed by different lasers and / or emit light of a different color. For example, all three laser light sources 22, 24, 26 may emit light of the same color. Furthermore, more or fewer laser light sources 22, 24, 26 than those shown may be arranged. For example, two or more laser light sources may be arranged for each of the desired colors.

[0043] The scattering body 28 has a first side facing the laser light sources 22, 24, 26 and a second side facing away from the laser light sources 42, 24, 26. The first and second sides each form a main surface of the scattering body 28. The scattering body 28 further has lateral side surfaces that connect the two main surfaces. The scattering body 28 is held at the lateral side surfaces by a holder 30. The scattering body 28 is formed from a scattering, for example, translucent, material and / or has a transparent carrier material in which scattering particles are embedded. The scattering body 28 is free of converter material. In other words, the scattering body 28 does not influence the wavelength of the light it scatters. The scattering body 28 is, for example, a white-scattering body that has sufficiently low absorption so that it is not overheated and destroyed by inadvertently absorbed laser radiation.The scattering body 28 is made of a porous, translucent ceramic, for example Al. 2 O 3 , formed. Alternatively, the scattering body 28 can be formed from a glass with pores and / or high-refractive scattering particles. Alternatively, the scattering body 28 can be formed from one or more coatings applied to a glass or sapphire carrier, which contain scattering particles, e.g., made of TiO 2 or Al 2 O 3, can be formed. These can also be embedded in matrices made of silicone or silane resin. Optionally, the first side of the scattering body 28 can have one or more color filters which, although they allow the light from the laser light sources 22, 24, 26 to pass through to the scattering body 28, do not allow the scattered light back into the half-space in which the laser light sources 20, 24, 26 are arranged, but instead, for example, reflect the corresponding light away from the light sources 22, 24, 26 towards the second side of the scattering body 28.

[0044] The laser beams 32, 34, 36 strike the scattering body 28 on the first side and enter the scattering body 28 on the first side. The scattering body 28 scatters the light of the laser beams 32, 34, 36 so that it mixes in the scattering body 28. On the second side of the scattering body 28, scattered light 38, which can also be referred to as mixed light, exits the scattering body 28. The scattering body 28 also causes the coherence of the laser beams 32, 34, 36 to be broken up. Fig. In the embodiment shown in Figure 1, white light with a particularly high luminance is produced due to the mixing of the light from the laser beams 32, 34, 36. Thus, the scattered light 38 is white light. Fig. The light-emitting assembly 20 shown in Figure 1 is a white light source that exhibits a very high luminance. If the individual laser light sources 42, 24, 26 each have a light output of, for example, 10 W and the scattered light 38 forms a spot with a diameter of 500 µm, a luminance of more than 5000 MCd / m 2 .

[0045] In Fig. 1 on the right side, a first diagram 40 and a second diagram 50 are shown one above the other. The first diagram 40 has a first coordinate system 42 in which a first light distribution 44 is plotted. The first light distribution 44 is the light distribution of one of the laser beams 32, 34, 36. The first light distribution 44 is almost linear and has a pointed peak around the value zero. The second light distribution 54 is the light distribution of the scattered light 38. The second light distribution 54 is Gaussian or has a Gaussian bell shape. The scattering body 28 thus causes the individual linear light distributions of the laser beams 32, 34, 36 to be converted into a single Gaussian light distribution, in particular a Lambertian light distribution. Thus, the Fig. 1, the light-emitting assembly 20 is a white light source having a very high luminance with a Lambertian light distribution.

[0046] Since the diffuser 28 does not convert the light from the laser beams 32, 34, 36, the diffuser 28 absorbs only a very small proportion of the light incident on it, for example, only between 0.1% and 10%, for example, only between 1% and 5%, for example, only approximately 2% of the light incident on it. Therefore, the diffuser 28 heats up significantly less and / or significantly worse during operation of the light-emitting assembly 20 than a converter body, such as that used in a LARP application. If the diffuser 28 can be operated at 400°C, for example, due to the material used, the light-emitting assembly 20 can generate a luminance and / or luminous flux that is, for example, a factor of 20 greater than in a similarly constructed LARP application.

[0047] Optionally, an optical system (not shown in the figures) that influences the scattered light 38, for example a wide-angle optical system, can be connected downstream of the scattering body 28. Using the wide-angle optical system, the scattered light 38 can be focused to any point in the room, thereby creating, for example, a white spot with a very high luminance. If the downstream optical system has, for example, one or more adjustable mirrors and / or one or more adjustable lenses, a diameter and / or a position of the spot in the room can be changed, thereby creating a lighting scheme in the room with almost any shape and position and particularly high luminance.

[0048] Fig. Figure 2 shows a schematic representation of a light-emitting assembly 20, which is not part of the invention. The light-emitting assembly 20 can, for example, largely correspond to the Fig. 1. Lenses 62, 64, 66 are arranged in the beam direction between the laser light sources 22, 24, 26 and the scattering body 28. In particular, a first lens 62 is arranged between the first laser light source 22 and the scattering body 28 such that the first lens 62 focuses the first laser beam 32 onto the first side of the scattering body 28. In addition, a second lens 64 is arranged between the second laser light source 24 and the scattering body 28 such that the second lens 64 focuses the second laser beam 34 onto the first side of the scattering body 28. Furthermore, a third lens 66 is arranged between the third laser light source 26 and the scattering body 28 such that the third lens 66 focuses the third laser beam 36 onto the first side of the scattering body 28. Alternatively, the lenses 62, 64, 66 may each be designed as collimating lenses.Optionally, the lenses 62, 64, 66 can be adjustable, so that a degree of focus and / or positions of the focal points on the first side of the diffuser 28 can be changed by means of the lenses 62, 64, 66. For example, the lenses 62, 64, 66 can be fluid lenses.

[0049] The scattering body 28 scatters the focused or collimated laser beams 32, 34, 36 incident on it and mixes the corresponding light so that the scattered, mixed light 38 exits the scattering body 28 on the second side.

[0050] Fig. 3 shows a schematic representation of an embodiment of a light-emitting assembly 20. The light-emitting assembly corresponds to the Fig. 1, except for the difference that dynamically adjustable mirrors 72, 74, 76 are arranged in the beam direction and optically between the laser light sources 22, 24, 26 and the scattering body 28. In particular, a first dynamically adjustable mirror 72 is arranged such that it reflects the first laser beam 32 towards the scattering body 28 and such that a reflected first laser beam 82 impinges on the scattering body 28. In addition, a second dynamically adjustable mirror 74 is arranged such that it reflects the second laser beam 34 towards the scattering body 28 and such that a reflected second laser beam 84 impinges on the scattering body 28. Furthermore, a third dynamically adjustable mirror 76 is arranged such that it reflects the third laser beam 36 towards the scattering body 28 and such that a reflected third laser beam 86 impinges on the scattering body 28.

[0051] The mirrors 72, 74, 76 are each mechanically coupled to an electrically adjustable adjusting element (not shown). The adjusting elements are each electrically controllable and enable adjustment of the corresponding mirrors 72, 74, 76. By adjusting the mirrors 72, 74, 76, the reflected laser beams 82, 84, 86 or the light spots generated on the first side can be moved across the first side of the scattering body 28. By changing the positions of the laser beams on the first side of the scattering body 28, a color, position, and / or direction of the scattered light 38 can be changed and / or specified. This makes it possible, for example, to display different shapes and colors on the second side of the scattering body 28, for example, one or more graphics, one or more lettering, and / or one or more images, for example, a film or a video.If the wide-angle optics are connected downstream of the diffuser 28, the dynamically adjustable mirrors 72, 74, 76 enable the use of the light-emitting assembly 20 as a projector, since the lettering, graphics, images, films, or videos generated in the diffuser 28 can be projected into the room, for example, onto a wall. The mirrors 72, 74, 76 can be part of a micromirror system (MEMS) or form a micromirror system.

[0052] The Fig. 3, the embodiment of the light-emitting assembly 20 can, according to a variant, additionally comprise the lenses 62, 64, 66 according to the embodiment described with reference to Fig. 2 explained assembly.

[0053] Fig. 4 shows a schematic representation of a light-emitting assembly 20, which is not part of the invention. The light-emitting assembly 20 can, for example, largely correspond to one of the light-emitting assemblies 20 explained above. The holder 30 is attached to the second side of the diffuser 28 and has a mirror surface 94 facing the latter. A transparent planarization layer 92 is arranged between the diffuser 28 and the holder 30.

[0054] The light scattered by the scattering body 28 strikes the mirror surface 94 and is reflected by it, so that reflected scattered light 90 exits the scattering body 28 into the same half-space in which the laser light sources 22, 24, 26 are arranged. The reflected scattered light 90 can be used in the same way as the scattered light 38 explained above.

[0055] The planarization layer 92 serves to provide a flat surface toward the holder 30, in particular the mirror surface 94, and / or to positively influence the efficiency of the light-emitting assembly 20 by appropriately selecting its refractive index. Alternatively, the planarization layer 92 can be omitted.

[0056] Furthermore, as an alternative to the mirror surface 94 on the holder 30, the second side of the scattering body 28 can be designed to be reflective, for example by applying one or more reflective metals, such as aluminum or silver. For example, a layer stack with corresponding reflective materials can be formed on the second side of the scattering body 28. The layer stack can be attached to the holder 30, for example, by soldering. Regardless of the design and / or position of the mirror surface 94, the holder 30 serves as a heat sink during operation of the light-emitting assembly 20 and / or to dissipate the heat generated in the scattering body 28.

[0057] The Fig. 4 shown light-emitting assembly 20 can, according to a variant, have the lenses 62, 64, 66 of Fig. 2 and / or the mirrors 72, 74, 76 of Fig. 3.

[0058] Fig. 5 shows a flowchart of an embodiment of a method for operating a light-emitting assembly, for example the one described with reference to Fig. 3 explained light-emitting assembly 20.

[0059] In a step S2, at least one first laser beam, at least one second laser beam, and optionally one, two, or more further laser beams, for example, laser beams 32, 34, 36, are generated and each emitted onto a dynamically adjustable mirror, for example, the mirrors 72, 74, 76 explained above. The mirrors 72, 74, 76 are aligned such that they reflect the laser beams 32, 34, 36 onto a scattering body, for example, the scattering body 28 explained above. The scattering body 28 mixes and scatters the light of the laser beams impinging on it and thus becomes a light source, for example, a white light source, with a very high luminance and a Gaussian or Lambertian light distribution.

[0060] In a step S4, the mirrors 72, 74, 76 are dynamically adjusted so that a light distribution, luminance and / or color of the light 38, 90 scattered by the scattering body 28 changes, whereby a changeable spot, a lettering, a graphic and / or one or more images, in particular a film or a video, can be displayed on the scattering body 28 or on a surface in a room.

[0061] The illustrated light-emitting assemblies 20 may each have more or fewer laser light sources. Each of the illustrated light-emitting assemblies 20 may have an optical system downstream of the scattering body 28 for influencing the scattered light 38, 90, for example, a wide-angle optical system. LIST OF REFERENCE SYMBOLS 20 Light-emitting assembly 22 first laser light source 24 second laser light source 26 third laser light source 28 scattering bodies 30 bracket 32 first laser beam 34 second laser beam 36 third laser beam 38 scattered light 40 first diagram 42 first coordinate system 44 first light distribution 50 second diagram 52 second coordinate system 54 second light distribution 62 first lens 64 second lens 66 third lens 72 first mirror 74 second mirror 76 third mirror 82 first reflected laser beam 84 second reflected laser beam 86 third reflected laser beam 90 reflected scattered light 92 Dielectric 94 mirror surface F area D Thickness S2 First Step S4 Second step

Claims

[1] Light-emitting assembly (20), with at least one first laser light source (22) for generating a first laser beam (32) and at least one second laser light source (24) for generating a second laser beam (34), a translucent scattering body (28) which is arranged in the beam path of the first and second laser beams (32, 34) and at a predetermined distance greater than zero from the first and second laser light sources (22, 24) and which is designed to scatter light of the first laser beam (32) such that a wavelength of a first scattered light (38, 90) is equal to a wavelength of the light of the first laser beam (32), and to scatter light of the second laser beam (34) such that a wavelength of a second scattered light (38, 90) is equal to a wavelength of the light of the second laser beam (34), further comprising one or more dynamically adjustable mirrors (72, 74) which are arranged in a beam path of the first and in a beam path of the second laser beam (32, 34) in front of the scattering body (28) and are designed such that the laser beams (32, 34) can be directed onto the scattering body (28) and positions at which the laser beams strike the scattering body (28) can be changed. [2] The light emitting assembly (20) of claim 1, further comprising optics configured and arranged to project the first and second scattered lights (38, 90). [3] Light-emitting assembly (20) according to one of the preceding claims, comprising a third laser light source (26) for generating a third laser beam (36). [4] Light-emitting assembly (20) according to one of the preceding claims, wherein the light of the second laser beam (34) has a different wavelength than the light of the first laser beam (32). [5] A light-emitting assembly according to claim 3, wherein the light of the second laser beam (34) has a different wavelength than the light of the first laser beam (32) and wherein the light of the third laser beam (36) has a different wavelength than the light of the first laser beam (32) and the light of the second laser beam (34). [6] The light emitting assembly (20) of claim 5, wherein the light of the first laser beam (32) is blue light, the light of the second laser beam (34) is green light, and the light of the third laser beam (36) is red light. [7] Light-emitting assembly (20) according to one of the preceding claims, in which the scattering body (28) has a first side which serves as a light entry surface and a second side facing away from the first side which serves as a light exit surface, so that the light of the corresponding laser beam (32, 34, 36) is coupled into the scattering body (28) on the first side and is coupled out of the scattering body (28) as scattered light (38) on the second side. [8] Light-emitting assembly (20) according to one of claims 1 to 6, wherein the scattering body (28) has a first side which serves as a light entry surface and as a light exit surface, so that the light of the corresponding laser beam (32, 34, 36) is coupled into and out of the scattering body (28) on the first side. [9] Light-emitting assembly (20) according to claim 8, wherein a mirror surface (94) is formed behind the scattering body (28) in the beam direction of the corresponding laser beam (32, 34, 36). [10] Light-emitting assembly (20) according to claim 9, wherein a dielectric (92) is formed between the scattering body (28) and the mirror surface (94). [11] Light-emitting assembly (20) according to one of the preceding claims, in which a collimating lens is arranged in the beam path of the corresponding laser beam (32, 34, 36) between the laser light source (22, 24, 26) and the scattering body (28), which collimates the light of the corresponding laser beam (32, 34, 36). [12] The light-emitting assembly (20) of claim 1, wherein the mirrors (72, 74, 76) are part of a micromirror system. [13] A display device comprising the light-emitting assembly (20) according to any one of the preceding claims. [14] A headlight of a motor vehicle comprising the light-emitting assembly (20) according to any one of claims 1 to 12. [15] Method for operating a light-emitting assembly (20), in which at least one first laser beam (32) and at least one second laser beam (34) are generated and radiated onto one or more dynamically adjustable mirrors (72, 74), the first laser beam (32) and the second laser beam (34) are reflected onto a translucent scattering body (28) by means of the dynamically adjustable mirrors (72, 74), Light of the reflected first laser beam (82) is scattered by the scattering body (28) such that the wavelength of a first scattered light (38, 90) is equal to the wavelength of the light of the first laser beam (32), light of the reflected second laser beam (84) is scattered by the scattering body (28) such that a wavelength of a second scattered light (38, 90) is equal to a wavelength of the light of the second laser beam (34), and Positions at which the first laser beam (32) and the second laser beam (34) enter the scattering body (28) are changed by means of the dynamically adjustable mirrors (72, 74).

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