EP1664900A1 - Head-up-display mit hochleistungsleuchtdiode und durchlichtbetriebener bilderzeugungseinheit - Google Patents
Head-up-display mit hochleistungsleuchtdiode und durchlichtbetriebener bilderzeugungseinheitInfo
- Publication number
- EP1664900A1 EP1664900A1 EP04766563A EP04766563A EP1664900A1 EP 1664900 A1 EP1664900 A1 EP 1664900A1 EP 04766563 A EP04766563 A EP 04766563A EP 04766563 A EP04766563 A EP 04766563A EP 1664900 A1 EP1664900 A1 EP 1664900A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- light source
- head
- display
- mirror
- 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.)
- Ceased
Links
Classifications
-
- 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
- G02B27/01—Head-up displays
-
- 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
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- 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
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
Definitions
- the invention relates to a head-up display with at least one light source, with at least one optics arranged downstream of the light source in the beam path, with at least one image-generating unit arranged downstream in the beam path of the light source.
- Such an arrangement is common in the field of motor vehicle display systems with head-up technology.
- a powerful light source is regularly provided which illuminates an image generation unit and in this way projects the image generated by the image generation unit onto a windshield of the motor vehicle.
- the development faces numerous technical problems.
- the always limited installation space in the motor vehicle has so far strictly limited the power of the light source, which plays a decisive role in the readability of the display in unfavorable ambient light conditions.
- Previous solutions provide, among other things, a field of light-emitting diodes which, owing to the limited space and the unfavorable radiation characteristics of individual light-emitting diodes, have an overall poor efficiency and generate a great deal of heat.
- the limiting factor when dimensioning an LED matrix light source is the heat dissipation power loss. For this reason, either extensive constructions, restrictions in the color display or a low brightness must be accepted.
- the object of the invention is to create a head-up display which, with only a small space requirement, meets the requirements for the brightness of the display under all conceivable ambient light conditions in terms of good readability fully met.
- the object is achieved by a head-up display of the type mentioned at the beginning, which has at least one light-emitting diode as light source, which has at least one LED chip and is designed as a high-power light-emitting diode with a power consumption of at least 0.5 watts per LED chip ,
- a high-performance light-emitting diode instead of, for example, a multi-colored LED matrix light source reduces the space requirement of the light source with the same light output to a fraction of what was previously required.
- optics connected to the light source are decidedly simpler due to the reduction in the number of light sources.
- An LED matrix light source of 128 individual diodes for example, required extremely complex optics for each individual light-emitting diode due to the unfavorable beam angle of the individual light-emitting diodes.
- the effort for bundling the light from the light source according to the invention can be concentrated on only a few individual high-performance light-emitting diodes.
- the power consumption of the high-performance light-emitting diode has been found to be 1 watt or 5 watt.
- the optics with a reflector which deflects and bundles the light from individual high-power light-emitting diodes, preferably a single high-power light-emitting diode, in the desired direction.
- the reflector is designed to be totally reflective.
- Conventional reflectors are regularly coated with aluminum so that their surface has a degree of reflection of approximately 90%. With an average number of six reflections per beam path from the light source until the reflector leaves, the reflection efficiency is approximately 50%. The remaining power of the light source must be dissipated as heat.
- a reflector designed to be totally reflective according to the invention achieves an efficiency of approximately 92%. Coated coupling and decoupling surfaces enable a transmittance of 99%.
- the reflector is particularly inexpensive to manufacture if it consists of a transmissive polymer.
- a transmissive polymer is easier to manufacture as a blank and, if necessary, easier to rework.
- the reflector can expediently have an essentially conical outer contour.
- a conical outer contour of the reflector regularly directs the light emitted by the light source in the desired direction of radiation.
- a pyramidal design of the outer contour of the reflector provides particular advantages, which essentially guarantees the same parallelism in the radiation characteristic and additionally makes it possible to arrange a plurality of reflectors in a modular manner next to one another with almost no space.
- the totally reflective reflector expediently has a coupling side, on the light of at least one light source is a ⁇ occurs, and a coupling-out, emerges on the light coupled.
- a vertical exit from the reflector is expedient. Since a completely parallel beam path behind the reflector can hardly be realized technically, it makes sense if the reflector emits a widening light cone that has a boundary surface, which boundary surface has an angle of approximately 5 ° with a central axis running centrally through the light cone in the main direction of light propagation - forms 15 °.
- the main direction of light propagation is to be understood here as the intensity-averaged direction of light propagation.
- the outer contour of the reflector makes sense to design the outer contour of the reflector to be convex and to design it as a rotating paraboloid that widens in the direction of light propagation.
- Very good results in the radiation characteristic can be achieved if the rotational paraboloid is based on a polynomial, for example of the fifth order.
- the coefficients of the polynomial are optimized depending on the position of the light source, the external dimensions of the reflector and the radiation characteristic of the light source in such a way that the most parallel possible beam path after the reflector is achieved and the most homogeneous intensity distribution possible over the radiation surface of the reflector.
- a particularly loss-free coupling of the light from the light source results if the reflector has a recess on the coupling-in side that receives the light source.
- the recess has a cylindrical, lateral boundary contour extending parallel to the central axis. In this way, the light from the light source for the most part shines almost perpendicularly onto the coupling surface and strikes the reflector.
- a further optimization of the optical properties of the totally reflecting reflector results if the recess has an end face which is arranged in the direction of the central axis and which is convex in the direction of the light source.
- the incoming light is deflected in the direction of the desired parallel beam path after it leaves the reflector as soon as it enters the reflector.
- a power of 5 watts of a high-performance light-emitting diode located in the recess of the reflector it has proven to be advantageous with regard to the radiation characteristic, the heat development and the brightness required for a head-up display if the reflector has an exit surface with a diagonal dimension of approximately 20 mm, and the recess has a diagonal dimension of about 5 mm.
- it can advantageously be directed onto an image generation unit arranged shortly behind it.
- Restrictions in terms of installation space regularly dictate the expediency of arranging a mirror in the beam path after the light source, which essentially reflects the wavelength spectrum of the light source in the direction of the subsequently arranged image generation unit.
- the mirror is designed to be color-selective, light from a first wavelength spectrum largely reflects and light from a second wavelength spectrum mostly transmitted. In this way, the color location in which the image generation unit is to be operated can be adjusted again with the aid of the mirror.
- the invention provides that the head-up display has at least two light sources, a first light source emits light of a first wavelength spectrum, a second light source emits light of a second wavelength spectrum, at least one color-selective mirror, the light, arranged downstream of these light sources of the first wavelength spectrum is reflected for the most part and light of the second wavelength spectrum is arranged for the most part to be transmitted such that in the beam path downstream of the mirror the light from both light sources is mixed and the light mixed in this way strikes the image generation unit.
- the intensity of the light sources of different spectra can be adjusted as required by means of dimming, a dimming rate of 1 in 2000 of the high-performance light-emitting diodes used providing an almost inexhaustible range of intensities and colors.
- the light from the first light source and the light from the second light source are advantageously mixed with one another by means of so-called dichroic mirrors.
- this can in such a way that the light of the first light source strikes a first side of the mirror, the light of the second light source strikes a second side of the mirror, the light of the first light source is reflected by the mirror, and the light of the second light source is transmitted by the mirror is and the main directions of light propagation of the light of the first light source and the light of the second light source substantially match the beam path after the mirror.
- the mirrors used can expediently be dielectrically coated interference mirrors which reflect certain wavelength spectra and reflect other wavelength spectra to the greatest possible extent.
- the mirrors are preferably designed as glass or plastic panes coated by means of sputtering technology, the coating regularly being a metal oxide layer.
- the light of the first light source is essentially red and the light of the second light source is essentially green.
- the invention also enables the use of at least three light sources of different wavelength spectra, so that the head-up display is fully color-capable.
- An embodiment of the invention advantageously provides that the head-up display has at least three light sources, a first light source emits light of a first wavelength spectrum, a second light source emits light of a second wavelength spectrum, a third light source emits light of a third wavelength spectrum, im
- At least two color-selective mirrors are arranged downstream of these light sources, a first mirror largely re-illuminates light of the first wavelength spectrum. diffracted and light of the second wavelength spectrum and third wavelength spectrum transmitted for the most part, a second mirror reflects light of the second wavelength spectrum for the most part and light of the third wavelength spectrum largely transmitted.
- the mirrors are arranged in such a way that the light from the light sources follows the mirrors in the beam path, and the light mixed in this way strikes the image generation unit.
- mirrors which are designed to be transmissive and reflective in a color-selective manner are also advantageously to be provided here.
- N1 dichroic mirrors are required.
- These dichroic mirrors are always to be arranged in the beam path of the resulting mixed light in such a way that the coupled-in light of the additional wavelength spectrum of the corresponding light source after reflection on the dichroic mirror has essentially the same main direction of light propagation as the resulting mixed light, the dichroic mirror being selectable in terms of its color With regard to reflection and transmission, it should be selected such that the light to be coupled into the mixed beam is reflected and with regard to the spectrum of further light sources arranged in the beam path of the mixed light in front of the light source to be coupled in, is transmissive.
- the dichroic mirrors it is advantageous to select the coupling of light into the mixed beam in the direction of propagation of the light, preferably from the shortest wavelength to the longest wavelength of the light to be mixed in from light sources.
- the light of the first light source is substantially red
- the light of the second light source is substantially green
- the light of the third light source is substantially blue, wherein the blue light of the third light source first in the main direction of propagation of the mixed Light is deflected, then the green light of the second light source is deflected in this direction and finally the red light of the first light source is aligned essentially in accordance with the main direction of propagation of the mixed light.
- FIG. 1 shows a schematic illustration of a head-up display according to the invention
- FIG. 2 shows a light source, a reflector and the resulting beam path according to the invention
- 3 shows the common arrangement of three light sources, three reflectors and the mixture by means of partially dichroic mirrors.
- the head-up display 1 shown schematically in FIG. 1 essentially comprises a light generating unit 2, an image generating unit 3, subsequent optical components 4, which are shown in simplified form in FIG. 1 as a black box, and a central controller 5, which is connected to the light generating unit 2, the image generation unit 3 and the optical components elements 4 is connected.
- the image generation unit 3 is illuminated by means of the light 6 generated by the light generation unit 2.
- the light 6 which has passed through the image generation unit 3 is projected by means of the optical components 4 onto a windshield 7 of a motor vehicle, not shown, so that the driver perceives the projection as a virtual image at a certain distance in front of him and integrated in the image of the surrounding landscape 8.
- the light generating unit 2 has light sources 13 which are arranged on a common carrier 35 designed as a heat sink.
- FIG. 2 shows a reflector 10 which is designed to be totally reflective.
- the reflector 10 has a coupling-in side 11 and a coupling-out side 12, the light 14 emitted by a light source 13 emerging from the coupling-out side 12 and the coupling-in side 11 essentially lying opposite the coupling-out side 12.
- the reflector 10 is provided with a recess 15 in which the light source 13 is arranged.
- the light 14 emerging on the coupling-out side 12 of the reflector 10 defines a light main propagation direction 16 in the intensity-averaged direction.
- the reflector 10 has a substantially conical outer contour 17, the reflector 10 being rotationally symmetrical with a central axis 18 extending in the direction of the light main propagation direction 16 is trained.
- the light source 13 is designed as a high-performance light-emitting diode and has a rectangular LED chip 20.
- the LED Chip 20 emits light 14 into recess 15 over a solid angle of almost 180 °.
- the recess 15 has a substantially cylindrical lateral contour 21 and is symmetrical to the central axis 18.
- an end face 22 is convexly curved in the direction of the light source 13.
- the light 14 emerging from the light source 13 enters the reflector 10 on the lateral boundary contour 21 and the curved end face 22 on the coupling-in side 11 and reaches either directly, via single reflection or multiple reflection on the outer contour 17 of the reflector 10 the coupling-out side 12, where it emerges from the reflector 10 essentially perpendicularly as a parallel beam.
- the emerging beam forms a light cone 25, which has a maximum widening in the main light propagation direction 16 of +/- 10 ° to the central axis 18 of the reflector 10.
- FIG. 3 shows the mixture of red 40, green 50 and blue 60 light which is emitted by a first light source 41, second light source 51 and third light source 61.
- the light sources 41, 51, 61 are high-performance light-emitting diodes, all of which are provided with a reflector 10, as shown in FIG. 2.
- a first mirror 42, second mirror 52 or third mirror 62 is arranged downstream of the light sources 41, 51, 61 in the beam path.
- the mirrors 42, 52, 62 direct the respective beam in the beam path of the light 40, 50, 60 into a common light - Main direction of propagation 16 um.
- the light main propagation direction 16 is oriented essentially perpendicular to the original beam path of the lights 40, 50, 60 originating from the light sources 41, 51, 61, which is an orientation the mirror 42, 52, 62 to the main light propagation direction 16 and the original propagation directions of the lights 40, 50, 60 are caused by 45 °.
- the third mirror 62 arranged first in the light propagation direction 16 is designed to be fully reflective.
- Arranged downstream in the main light propagation direction 16 is the second mirror 52, which reflects and transmits in a color-selective manner.
- the blue light 60 strikes a second side 55 of the second mirror 52 and is transmitted in the main light propagation direction 16.
- the green light 50 from the second light source 51 strikes the second mirror 52 on a first side 56 and is deflected or reflected on the basis of its wavelength spectrum in the main direction of light propagation 16.
- the first mirror 42 transmits the blue 60 and green 50 light incident on a second side 45 and reflects the red 40 light incident on a first side 46 in the main light propagation direction 16, so that it mixes the red 40, green 50 and blue 60 light comes with a common light propagation direction 16.
- the illuminated image generation unit 3 which has a display area of approximately 19 mm ⁇ 38 mm, follows after the first mirror 42 in the main direction of light propagation 16.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Instrument Panels (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003144686 DE10344686A1 (de) | 2003-09-25 | 2003-09-25 | Head-Up-Display |
| PCT/EP2004/051865 WO2005031438A1 (de) | 2003-09-25 | 2004-08-20 | Head-up-display mit hochleistungsleuchtdiode und durchlichtbetriebener bilderzeugungseinheit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1664900A1 true EP1664900A1 (de) | 2006-06-07 |
Family
ID=34384293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04766563A Ceased EP1664900A1 (de) | 2003-09-25 | 2004-08-20 | Head-up-display mit hochleistungsleuchtdiode und durchlichtbetriebener bilderzeugungseinheit |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1664900A1 (de) |
| DE (1) | DE10344686A1 (de) |
| WO (1) | WO2005031438A1 (de) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006019731A1 (de) * | 2006-04-28 | 2007-10-31 | Bayerische Motoren Werke Ag | Head-up-Display und Fahrzeug |
| DE102008023225B4 (de) | 2008-05-10 | 2019-08-08 | Bayerische Motoren Werke Aktiengesellschaft | Head-up-Display und Fahrzeug |
| DE102008063349A1 (de) | 2008-12-30 | 2010-07-01 | Shirley Weigele | Behältnis mit Schirm zur Darstellung des Inhalts |
| DE102009011908B4 (de) | 2009-03-05 | 2021-12-09 | Bayerische Motoren Werke Aktiengesellschaft | Head-up-Display und Fahrzeug |
| DE102011121558B4 (de) * | 2011-10-05 | 2017-06-01 | Johnson Controls Automotive Electronics Gmbh | Anzeigevorrichtung und Verfahren zum Betrieb einer Anzeigevorrichtung |
| DE202013009329U1 (de) | 2013-10-18 | 2014-03-14 | Institut für innovative Technologien, Technologietransfer, Ausbildung und berufsbegleitende Weiterbildung (ITW) e.V. | Hochleistungs-Flächenlichtquelle |
| JP6127923B2 (ja) * | 2013-11-06 | 2017-05-17 | 株式会社デンソー | ヘッドアップディスプレイ装置 |
| DE102017217771A1 (de) | 2017-10-06 | 2019-04-11 | Robert Bosch Gmbh | Reflektoreinheit, insbesondere für eine Hinterleuchtungseinheit |
| DE102017217774A1 (de) | 2017-10-06 | 2019-04-11 | Robert Bosch Gmbh | Optisches Element, insbesondere für eine Hinterleuchtungseinheit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5231379A (en) * | 1987-09-18 | 1993-07-27 | Hughes Flight Dynamics, Inc. | Automobile head-up display system with apparatus for positioning source information |
| JPH11231316A (ja) * | 1998-02-17 | 1999-08-27 | Ricoh Co Ltd | カラー画像表示装置 |
| WO2001046739A2 (de) * | 1999-12-21 | 2001-06-28 | Robert Bosch Gmbh | Anzeigevorrichtung |
| US6523976B1 (en) * | 1996-06-13 | 2003-02-25 | Gentex Corporation | Led assembly |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19540108C2 (de) * | 1995-10-27 | 1998-08-06 | Ldt Gmbh & Co | Vorrichtung zur Darstellung eines ersten Bildes in einem durch eine durchsichtige Scheibe sichtbaren zweiten Bild |
| JP2002529791A (ja) * | 1998-11-06 | 2002-09-10 | コピン・コーポレーシヨン | マイクロデイスプレービューワー |
| DE19941897B4 (de) * | 1999-09-02 | 2006-06-14 | GSF - Forschungszentrum für Umwelt und Gesundheit GmbH | IL-6 Rezeptor-Protein, Beta-Kette (gp130) des IL-6 Rezeptor-Proteins, für diese Proteine kodierende DNA, davon abgeleitete RNA, Peptid mit den Aminosäuren 771-811 dieser Beta-Kette oder Teilen davon und deren Verwendungen |
-
2003
- 2003-09-25 DE DE2003144686 patent/DE10344686A1/de not_active Ceased
-
2004
- 2004-08-20 EP EP04766563A patent/EP1664900A1/de not_active Ceased
- 2004-08-20 WO PCT/EP2004/051865 patent/WO2005031438A1/de not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5231379A (en) * | 1987-09-18 | 1993-07-27 | Hughes Flight Dynamics, Inc. | Automobile head-up display system with apparatus for positioning source information |
| US6523976B1 (en) * | 1996-06-13 | 2003-02-25 | Gentex Corporation | Led assembly |
| JPH11231316A (ja) * | 1998-02-17 | 1999-08-27 | Ricoh Co Ltd | カラー画像表示装置 |
| WO2001046739A2 (de) * | 1999-12-21 | 2001-06-28 | Robert Bosch Gmbh | Anzeigevorrichtung |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO2005031438A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10344686A1 (de) | 2005-05-25 |
| WO2005031438A1 (de) | 2005-04-07 |
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