CN111656088A - Lighting device, in particular a headlight, for a motor vehicle - Google Patents
Lighting device, in particular a headlight, for a motor vehicle Download PDFInfo
- Publication number
- CN111656088A CN111656088A CN201980009716.9A CN201980009716A CN111656088A CN 111656088 A CN111656088 A CN 111656088A CN 201980009716 A CN201980009716 A CN 201980009716A CN 111656088 A CN111656088 A CN 111656088A
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- China
- Prior art keywords
- array
- liquid crystal
- light
- crystal elements
- lighting device
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Classifications
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- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Liquid Crystal (AREA)
Abstract
The invention relates to a lighting device for a motor vehicle, in particular a headlight, comprising: a light source (1); a polarizing beam splitter mechanism (3) which splits light (2) originating from a light source (1) during operation of the lighting device into a first light component (4) and a second light component (5), wherein the polarizations of the light components (4, 5) differ; a first array (6) of liquid crystal elements on which a first light component (4) is incident; a second array (10) of liquid crystal elements upon which a second light component (5) is incident, wherein each liquid crystal element is selectively steerable so as to change the direction of polarization at least when separating the light components (4, 5); and a polarization filter means, on which the light components (4, 5) are incident after interaction with the arrays (6, 10), wherein the first array (6) of liquid crystal elements is designed and arranged in the lighting device in such a way that the first array (6) operates in reflection and the reflected portion of the first light component (4) is incident on the polarization filter means during operation of the lighting device.
Description
Technical Field
The invention relates to a lighting device, in particular a headlight, for a motor vehicle according to the preamble of claim 1.
Background
A lighting device of the above-mentioned type is known from DE 102013113807 a 1. The lighting device is designed as a headlight and has a light source, which may be, for example, a light-emitting diode (LED) or a laser diode. Light originating from the light source is split by the polarizing beam splitter into a first light component and a second light component, the polarization directions of the light components being oriented perpendicular to one another. The lighting device furthermore has two arrays of liquid crystal elements, through which the light components individually pass. The individual liquid crystal elements of the array can be selectively manipulated to rotate the polarization direction at least when splitting the light component. The light emerging from the array passes through a polarizing filter serving as an analyzer and is projected by a projection lens into the exterior space in front of the motor vehicle.
It is considered disadvantageous here that a part of the light is absorbed upon transmission of the light component through the array of liquid crystal elements. The absorbed light is largely converted into heat and cannot be used for roadway lighting.
Disclosure of Invention
The problem of the invention is to provide a lighting device of the type mentioned at the outset which is more efficient.
This is achieved according to the invention by a lighting device of the type mentioned at the outset having the features of the characterizing portion of claim 1. The dependent claims relate to preferred embodiments of the invention.
According to claim 1, the first array of liquid crystal elements is designed and arranged in the illumination device in such a way that the first array operates in reflection, wherein the reflected portion of the first light component is incident on the polarization filter means during operation of the illumination device. By operation of the reflection of the first array of liquid crystal elements, a smaller portion of the light is absorbed in the array of liquid crystal elements. In particular, the efficiency of the lighting device designed as a headlight can be increased thereby.
It can be provided that the second array of liquid crystal elements is designed and arranged in the illumination device in such a way that the second array operates in a transmissive manner, wherein the transmitted portion of the second light component is incident on the polarization filter means during operation of the illumination device. Alternatively, the second array of liquid crystal elements may also operate reflectively.
There is a possibility that the first array of liquid crystal elements has a higher resolution than the second array of liquid crystal elements. This is particularly suitable in the case of a first array which operates in reflection and a second array which operates in transmission, since in the transmissive operation the high-resolution array of liquid crystal elements absorbs light more strongly than the lower-resolution array of liquid crystal elements.
It may be provided that the first array of liquid crystal elements is constituted as an active matrix LCD. This makes it possible for the first array of liquid crystal elements to be suitable for generating a first light distribution in front of the motor vehicle, which in particular corresponds to a high-resolution front area illumination. Such an active matrix LCD may be used, for example, to project symbols into the front area of a motor vehicle.
It may furthermore be provided that the second array of liquid crystal elements is constituted as a passive matrix LCD. This makes it possible for the second array of liquid crystal elements to be suitable for generating a second light distribution in front of the motor vehicle, which second light distribution corresponds in particular to the low-resolution range of action and the front-area illumination.
In this case, the lighting device may be designed such that, in operation of the lighting device, the first and second light distributions are superimposed to form an overall light distribution. In particular for optimizing the contrast of the front area projection, the intensity of the front area illumination can be adapted with low resolution by means of a passive matrix LCD.
It may be provided that the first array of liquid crystal elements has a cooling mechanism, in particular on the side of the first array facing away from the side on which the reflection takes place. Overheating of the first array of liquid crystal elements can thereby be avoided.
It is possible for the lighting device to have a projection device for projecting the light originating from the polarization filter device into the exterior of the motor vehicle, wherein in particular one projection lens is provided for each of the two light components. By using one projection lens for each light component, the projection lens can be optimized for the light distribution to be produced by the respective array.
Drawings
The invention is further explained next with the aid of the figures. Here:
fig. 1 shows a schematic view of an embodiment of a lighting device according to the invention;
fig. 2 schematically shows a first light distribution, which is generated by a first array of liquid crystal elements;
fig. 3 shows a schematic second light distribution, which is generated by the second array of liquid crystal elements.
Detailed Description
Identical or functionally identical components are provided with the same reference symbols in the figures.
The embodiment of the lighting device shown in fig. 1 has a light source 1 from which light 2 emanates during operation of the lighting device. The light source may, for example, have at least one laser diode or at least one Light Emitting Diode (LED). However, it is also entirely possible to provide one or more further light sources, for example discharge lamps or incandescent lamps.
The illumination device furthermore has a polarizing beam splitter mechanism 3, which in the exemplary embodiment described is designed as a polarizing beam splitter arranged at an angle of approximately 45 ° with respect to the propagation direction of the light 2. In operation of the illumination device, light 2 originating from the light source 1 is split into a first light component 4 and a second light component 5 by means of the polarizing beam splitter mechanism 3, the polarization directions of the light components 4, 5 being oriented perpendicular to one another. In the exemplary embodiment described here, the first light component 4 passes unhindered in fig. 1 upwards through the polarizing beam splitter, while the second light component 5 is reflected by the polarizing beam splitter to the right in fig. 1.
The lighting device furthermore has a first array 6 of liquid crystal elements, on which the first light component 4 is incident. The first array of liquid crystal elements 6 may in particular be a high resolution active matrix LCD. The active matrix LCD may, for example, have m · n liquid crystal elements, so that the first light component 4 may be influenced in a targeted manner with a resolution of m · n pixels.
The first array 6 of liquid crystal elements is constructed and arranged in the lighting device such that it can operate reflectively. I.e. the first light component 4 is reflected by the first array 6 at least partly to the right in fig. 1. The individual liquid crystal elements of the first array 6 can in this case be selectively actuated in a manner known per se in order to rotate the polarization direction, in particular pixel by pixel or for groups of pixels, when separating the first light component 4.
It may be provided that a cooling mechanism, not shown, is provided on the back side of the first array of liquid crystal elements 6 not used for reflection, which cooling mechanism may avoid overheating of the first array 6.
The first light component 4 reflected by the first array 6 of liquid crystal elements passes through a first polarisation filter 7 which acts as an analyser. In this case, such a portion of the first light component 4 for which the polarization direction is rotated by the first array 6 is, for example, put in a targeted manner by the first polarization filter 7. Alternatively, also such portions of the first light component 4 for which the polarization direction is not rotated by the first array 6 may be for example specifically passed through by the first polarization filter 7.
The portion of the first light component 4 which has been removed by the first polarization filter 7 is projected by a projection lens 8 into the exterior of the motor vehicle. Fig. 2 schematically shows a first light distribution 9 in front of the motor vehicle, which is generated by the first array 6 of liquid crystal elements from the first light component 4. The first light distribution 9 may especially be a high resolution front area illumination.
The lighting device furthermore has a second array 10 of liquid crystal elements, on which the second light component 5 is incident. The second array of liquid crystal elements 10 may in particular be a passive matrix LCD. The liquid crystal elements of the second array 10 may specifically influence the second light component 5. In particular the second array of liquid crystal elements 10 may have a lower resolution than the first array of liquid crystal elements 6.
The second array 10 of liquid crystal elements is designed and arranged in the lighting device in such a way that it can be operated in transmission. I.e. the second light component 5 passes at least partly to the right in fig. 1 through the second array 10. In this case, the individual liquid crystal elements of the second array 10 can be selectively actuated in a manner known per se in order to rotate the polarization direction, in particular pixel by pixel or for groups of pixels, when separating the second light component 5.
It is also entirely possible to design and arrange the second array 10 of liquid crystal elements in the lighting device in such a way that it can operate in reflection.
The second light component 5 put down by the second array 10 of liquid crystal elements passes through a second polarization filter 11 serving as an analyzer. In this case, the second polarization filter 11, for example, is used to specifically filter the portion of the second light component 5 for which the polarization direction is rotated by the second array 10. Alternatively, such a portion of the second light component 5 for which the polarization direction is not rotated by the second array 10 can also be put in place, for example, specifically by the second polarization filter 11.
The portion of the second light component 5 which has been removed by the second polarization filter 11 is projected by a projection lens 12 into the exterior of the motor vehicle. It is entirely possible to integrate the projection lenses into one component instead of two separate projection lenses 8, 12.
Fig. 3 schematically shows a second light distribution 13 in front of the motor vehicle, which is generated by the second array 10 of liquid crystal elements from the second light component 5. This second light distribution 13 may be especially low-resolution coverage and front area illumination. In operation of the lighting device, the first and second light distributions 9, 13 are superimposed to form an overall light distribution.
List of reference numerals
1 light source
2 light from a light source
3 polarization beam splitter mechanism
4 first light component
5 second light component
6 first array of liquid crystal elements
7 polarization filter
8 projection lens
9 first light distribution
10 second array of liquid crystal cells
11 polarization filter
12 projection lens
13 second light distribution
Claims (10)
1. Lighting device for a motor vehicle, in particular a headlight, having
-a light source (1),
a polarizing beam splitter mechanism (3) which splits light (2) which originates from a light source (1) during operation of the lighting device into a first light component (4) and a second light component (5), wherein the polarizations of the light components (4, 5) differ, in particular the polarization directions of the light components (4, 5) are oriented perpendicular to one another,
-a first array (6) of liquid crystal elements on which the first light component (4) is incident, wherein the individual liquid crystal elements can be selectively manipulated in order to change the polarization direction at least when splitting the first light component (4),
-a second array (10) of liquid crystal elements on which a second light component (5) is incident, wherein the individual liquid crystal elements can be selectively manipulated in order to change the polarization direction at least when splitting the second light component (5), and
-a polarization filter means on which the light components (4, 5) are incident after interaction with the array (6, 10), wherein in particular for each of the two light components a separate polarization filter (7, 11) is provided,
the lighting device is characterized in that the first array (6) of liquid crystal elements is designed and arranged in such a way that the first array (6) operates in a reflective manner, wherein the reflected portion of the first light component (4) is incident on the polarization filter means during operation of the lighting device.
2. An illumination device as claimed in claim 1, characterized in that the second array (10) of liquid crystal elements is designed and arranged in the illumination device such that the second array (10) operates in transmission during operation of the illumination device, wherein the transmitted portion of the second light component (5) can be incident on the polarization filter means.
3. A lighting device as claimed in claim 1 or 2, characterized in that the first array (6) of liquid crystal elements has a higher resolution than the second array (10) of liquid crystal elements.
4. A lighting device as claimed in any one of claims 1 to 3, characterized in that the first array (6) of liquid crystal elements is constituted as an active matrix LCD.
5. Lighting device according to one of claims 1 to 4, characterized in that the first array (6) of liquid crystal elements is adapted for generating a first light distribution (9) in front of the motor vehicle, in particular corresponding to a high resolution front area lighting.
6. An illumination device as claimed in one of the claims 1 to 5, characterized in that the second array (10) of liquid crystal elements is constructed as a passive matrix LCD.
7. Lighting device according to one of claims 1 to 6, characterized in that the second array (10) of liquid crystal elements is adapted for generating a second light distribution (13) in front of the motor vehicle, in particular corresponding to a low resolution of the active range and front area lighting.
8. A lighting device as claimed in claim 7, characterized in that the lighting device is constructed such that, in operation of the lighting device, the first and second light distributions (9, 13) are superimposed to form a total light distribution.
9. A lighting device as claimed in one of claims 1 to 8, characterized in that the first array of liquid crystal elements (6) has cooling means, which are arranged in particular on a side of the first array (6) facing away from the side on which reflection takes place.
10. Illumination device according to one of claims 1 to 9, characterized in that the illumination device has a projection device for projecting the light originating from the polarization filter device into the exterior of the motor vehicle, wherein in particular one projection lens (8, 12) is provided for each of the two light components (4, 5).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018101426.0 | 2018-01-23 | ||
| DE102018101426.0A DE102018101426A1 (en) | 2018-01-23 | 2018-01-23 | Lighting device for a motor vehicle, in particular headlights |
| PCT/EP2019/050849 WO2019145184A1 (en) | 2018-01-23 | 2019-01-15 | Lighting device for a motor vehicle, in particular headlight |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111656088A true CN111656088A (en) | 2020-09-11 |
Family
ID=65234529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980009716.9A Pending CN111656088A (en) | 2018-01-23 | 2019-01-15 | Lighting device, in particular a headlight, for a motor vehicle |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN111656088A (en) |
| DE (1) | DE102018101426A1 (en) |
| WO (1) | WO2019145184A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130136111A (en) * | 2012-06-04 | 2013-12-12 | 현대모비스 주식회사 | Lamp apparatus of an automobile |
| DE102013113807A1 (en) * | 2013-12-11 | 2015-06-11 | Hella Kgaa Hueck & Co. | Lighting device for a motor vehicle |
| DE202016102988U1 (en) * | 2015-06-10 | 2016-06-17 | Zizala Lichtsysteme Gmbh | Headlight for motor vehicles |
| CN105737054A (en) * | 2016-01-29 | 2016-07-06 | 吴进龙 | Projection-type headlamp system used on motor vehicle |
| CN106939992A (en) * | 2017-05-14 | 2017-07-11 | 上海小糸车灯有限公司 | A kind of lamp system based on PBS optical splitters |
| DE102016003814A1 (en) * | 2016-03-26 | 2017-09-28 | Audi Ag | Motor vehicle with at least one headlamp and a device for determining the location of the motor vehicle and method for operating at least one headlight of a motor vehicle |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015224880A1 (en) * | 2015-12-10 | 2017-06-14 | Osram Gmbh | Headlamp for lighting |
| DE102016109530A1 (en) * | 2016-05-24 | 2017-11-30 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Automotive headlamp |
| DE102016211691B4 (en) * | 2016-06-29 | 2024-04-25 | Volkswagen Aktiengesellschaft | Apparatus and method for generating an output light emission |
-
2018
- 2018-01-23 DE DE102018101426.0A patent/DE102018101426A1/en active Pending
-
2019
- 2019-01-15 CN CN201980009716.9A patent/CN111656088A/en active Pending
- 2019-01-15 WO PCT/EP2019/050849 patent/WO2019145184A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130136111A (en) * | 2012-06-04 | 2013-12-12 | 현대모비스 주식회사 | Lamp apparatus of an automobile |
| DE102013113807A1 (en) * | 2013-12-11 | 2015-06-11 | Hella Kgaa Hueck & Co. | Lighting device for a motor vehicle |
| DE202016102988U1 (en) * | 2015-06-10 | 2016-06-17 | Zizala Lichtsysteme Gmbh | Headlight for motor vehicles |
| CN105737054A (en) * | 2016-01-29 | 2016-07-06 | 吴进龙 | Projection-type headlamp system used on motor vehicle |
| DE102016003814A1 (en) * | 2016-03-26 | 2017-09-28 | Audi Ag | Motor vehicle with at least one headlamp and a device for determining the location of the motor vehicle and method for operating at least one headlight of a motor vehicle |
| CN106939992A (en) * | 2017-05-14 | 2017-07-11 | 上海小糸车灯有限公司 | A kind of lamp system based on PBS optical splitters |
Non-Patent Citations (2)
| Title |
|---|
| 王风录: "《计算机组装与维修》", 31 May 2006, 国防科技大学出版社 * |
| 谢完成: "《液晶电视机电路分析与维修》", 30 September 2016, 北京理工大学出版社 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018101426A1 (en) | 2019-07-25 |
| WO2019145184A1 (en) | 2019-08-01 |
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Application publication date: 20200911 |