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WO2012156124A1 - Affichage tête haute comportant des éléments optiques holographiques - Google Patents

Affichage tête haute comportant des éléments optiques holographiques Download PDF

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Publication number
WO2012156124A1
WO2012156124A1 PCT/EP2012/054788 EP2012054788W WO2012156124A1 WO 2012156124 A1 WO2012156124 A1 WO 2012156124A1 EP 2012054788 W EP2012054788 W EP 2012054788W WO 2012156124 A1 WO2012156124 A1 WO 2012156124A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical element
holographic optical
beam path
display device
section
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
Application number
PCT/EP2012/054788
Other languages
German (de)
English (en)
Inventor
Jan Weingarten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to CN201280023445.0A priority Critical patent/CN103534632A/zh
Publication of WO2012156124A1 publication Critical patent/WO2012156124A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
    • 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
    • G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
    • 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
    • G02B27/0149—Head-up displays characterised by mechanical features
    • G02B2027/015—Head-up displays characterised by mechanical features involving arrangement aiming to get less bulky devices

Definitions

  • HUP with holographic optical elements The invention relates to a display device according to the preamble of claim 1.
  • Display systems are used in vehicles. This favors in particular the development of head-up displays, with which vehicle data such as speed, speed, fuel level or weather conditions z. B. in the field of view of a driver can be superimposed on lying in the direction of travel traffic situations. Therefore, in recent years, a lot of new
  • holographic optical elements are known.
  • a known application of holographic optical elements in display systems is, for. B. to correct aberrations of an optical beam path or a single optical element.
  • DE 103 44 688 A1 presents a head-up display, in which an optical imaging element is combined with a holographic optical element in order, for. B. on a transparent coated mirror optical aberrations using a holographic optical element formed in the coating to correct.
  • WO 2009/156752 A1 introduces a display system which, in a broader sense, takes up holographic concepts. It consists of a spatial light modulator, e.g. a micromirror display illuminated by an expanded laser beam. A computer unit generates data for controlling the spatial
  • Light modulator which is the spatial light modulator in hologram-like
  • Interference pattern can be implemented so that information as a diffraction image on a screen or directly on the retina of a viewer can be seen.
  • One Disadvantage of the system is that the visibility of the displayed information is relatively sensitive depending on the viewing direction due to the strong angular dependence of diffraction patterns.
  • Another disadvantage of this technique is the comparatively high and thus expensive computing power which is necessary for the control in order to convert conventional image data into interference patterns.
  • the object of the present invention is the space requirement of
  • Display devices in particular of head-up displays to reduce in vehicles with relatively simple means.
  • a display device in particular a head-up display, with the features of claim 1.
  • the invention is based on a display device, in particular a head-up display, with a light-emitting image source and with optical elements which form a beam path for radiation bundles.
  • the optical elements include a reflector and a holographic optical element having a predetermined optical imaging function.
  • the essence of the invention is that the holographic optical element in
  • Beam path is spatially separated from the reflector and that the
  • holographic optical element is arranged in the beam path such that
  • Beams of a first portion of the beam path are directed to the holographic optical element to redirect them under the influence of the imaging function of the holographic optical element in a second portion of the beam path in a new direction, and that the reflector and the holographic optical element are arranged to each other, that radiation beams emitted by the reflector into a third section of the beam path can at least partially illuminate the holographic optical element, wherein the
  • Incidence angles at which an influence of the imaging function of the holographic optical element is effective differ.
  • the holographic optical element is on a transparent, especially clear transparent body, for example, made of a mineral glass.
  • transparent body serves as a support for the holographic optical element.
  • the transparent body has large surface areas, e.g. are just.
  • a preferred embodiment of the invention is that the transparent body is a particular thin disc on which the holographic optical element is formed. The thickness of the disc is mainly in the
  • Compared to a length of the third portion of the beam path is thin and is preferably less than one-tenth of a beam length in the third section. in the
  • the disk thickness is e.g. at most one quarter of this diameter, more preferably less than one fifth, preferably not more than one-eighth, in particular not more than one-tenth.
  • the holographic optical element is relatively inexpensive to produce and can be relatively easily attached to a designated position in the display device.
  • the minimum thickness may be determined by providing a predetermined stiffness of the disk to it
  • the transparent body may be e.g. be arranged in parallel or e.g. to form a prism at an angle to each other.
  • the clear-transparent body may for example consist of several, e.g. two, layers with different refractive indices can be constructed.
  • the holographic optical element can advantageously be produced as a phase hologram.
  • an optical element will be referred to as conventional if it is an optical image by refraction on a surface after
  • a holographic optical element is a hologram, i. a holographic one
  • the optical imaging function of the holographic optical element is determined by the conventional optical element, which is recorded as a hologram in the holographic optical element.
  • the optical imaging function can also correspond to a combination of conventional optical elements.
  • the optical imaging function is in
  • Holographic optical element formed as a diffraction structure which may be formed in a spatial periodic modulation, for example, a reflection coefficient or, for example, a refractive index in the transparent body of a carrier.
  • a Diffraction efficiency describes a relative proportion of the light incident on a diffraction structure, which is diffracted, for example, overall or, for example, in a predetermined direction.
  • the diffraction efficiency can be influenced by an amplitude and a strength of the spatial modulation, for example a reflection coefficient.
  • a diffraction structure for the holographic optical element may be formed, for example, by exposure and development of a photographic layer, or e.g. be embossed in the form of a structuring on a boundary or surface of a transparent support.
  • a diffraction structure e.g. an optical structure for exposure to an interference image or e.g. starting from a numerical calculation
  • a diffraction pattern e.g. be transferred by laser processing in a transparent photorefractive polymer.
  • the diffraction structure is formed in an at least approximately planar layer, wherein preferably this layer is arranged parallel to an approximately flat large surface of the transparent body. This offers the advantage that the holographic optical element can be aligned comparatively easily.
  • the optical imaging function of the holographic optical element is available only on condition that the diffraction conditions for a
  • the diffraction conditions are met by the fact that angle of incidence of the first portion of the beam path, angle of reflection of the second portion of the beam path, a wavelength of the light used and the holographic optical element matched.
  • the angles of reflection of the second section of the beam path correspond to the new direction of the
  • the image source is adapted to emit substantially coherent light, in particular monochromatic coherent light. This is
  • the image source by, for example, obtaining the image source from e.g. one
  • Liquid crystal display is provided with a. expanded or e.g. scanning laser beam is illuminated.
  • the holographic optical element and the image source are matched to one another, at least with regard to a wavelength or a wavelength range of available light.
  • a beam hits the holographic optical element with wiggles, which do not conform to the diffraction conditions, can pass substantially unbent through the holographic optical element and its transparent body.
  • the diffraction structure of the holographic optical element can cause a reduction in the light intensity at a passing beam.
  • the holographic optical element is positioned in the third section of the beam path in such a way that bundles of rays which are irradiated into the third section of the beam path in
  • the display device thus advantageously uses the lighted
  • Imaging function is essentially only effective when deflecting light beams from the first portion of the beam path in the second section.
  • the display device according to the invention thus enables a comparatively more compact construction and thereby facilitates its placement in a vehicle, in particular in an instrument panel.
  • the holographic optical element can be arranged in different ways in the third section of the beam path. Beams of the third section may pass through the holographic optical element continuously and / or only temporarily during operation of the display device. In this case, entire bundles of rays and / or parts of bundles of rays in the third section can completely and / or only partially cover a region of the holographic optical element
  • a surface of the transparent body in particular a transparent thin disc, is designed such that it is attached to a
  • a preferred embodiment of the invention provides that the reflector, the
  • Beam directs into the third gate of the beam path, a mirror is. This offers the advantage that the deflection or imaging hardly or no
  • a specular reflector can additionally be designed for an optical enlargement of the image display.
  • the display device may comprise further optical elements, in particular conventional optical elements.
  • the display device may have another, e.g. Own mirror to the beam path through
  • a display device can have a diffusing screen for generating real images, with which, for example, the light of real images can be directed into the first section of the beam path and onto the holographic optical element.
  • the third portion and thus also the holographic optical element can be housed in a housing of the display device and protected against disturbances of their arrangement, which the
  • the holographic optical element can be advantageously protected from disturbing radiation from an environment of the display device and from contamination.
  • a preferred embodiment of the invention provides that the holographic optical element is arranged in the display device such that radiation beams of the second section of the beam path are directed onto the reflector.
  • the reflector directs radiation beam of the second section of the beam path directly into the third section.
  • it is arranged in the display device such that only a comparatively small, negligible part of the light beams of the third section of the beam path can strike the holographic optical element at illumination angles at which diffraction by the holographic optical element occurs. This can be done by a comparatively simpler
  • Diffraction efficiency of the holographic optical element on the reflector such is agreed that in a direct radiation of the holographic optical element with light radiation originating from the reflector, no significant
  • the diffraction efficiency may be less than 90 percent, better still less than 80 percent, preferably less than 70 percent, in particular less than 60 percent and particularly preferably about 50 percent.
  • the comparatively lower diffraction efficiency can be achieved by a correspondingly increased intensity of light emission by the image source
  • a further preferred embodiment of the invention consists in that at least one further optical element is provided for deflecting radiation beams from the second section of the beam path such that the reflector guides them
  • the holographic optical element substantially always without diffraction loss. Therefore, it is preferred that the
  • Diffraction efficiency of the holographic optical element is comparatively high, e.g. over 60 percent, better over 70 percent, especially over 80 percent and most preferably over 90 percent.
  • the third section can not only directly or indirectly follow the second section, but it is also conceivable that the third section of the beam path lies indirectly or immediately before the first section, so that imaging
  • Illuminate section of the beam path before they hit the reflector and finally pass through the first and the second section of the beam path.
  • the holographic optical element is designed as a reflective hologram.
  • the optical effect works here
  • the holographic optical element can be replaced by a comparatively strong one
  • the holographic optical element is formed as a transmissive hologram. This offers the advantage that comparatively lower intensity losses occur at the holographic optical element.
  • Wavelengths are tuned for a multicolor display.
  • Figure 1 a a section of a vehicle in a schematic side
  • Figure 1 b a section of a vehicle in a schematic lateral
  • Figure 2 shows a detail of a vehicle in a schematic lateral
  • Figure 3 shows a detail of a vehicle in a schematic lateral
  • Figures 1a and 1b each show a vehicle 20 with a head-up display 10 according to the prior art, the driver 30 when looking in the direction of travel
  • the driver 30 is symbolically represented in all FIGS. 1 a, 1 b, 2 and 3 by a head 31 with eyes 32.
  • Figures 1a and 1b show an arrangement of the head-up display 10 in the vehicle 20, which is similarly applicable to a head-up display 1 according to the invention, which is shown in Figures 2 and 3.
  • the head-up display 10 is housed in the vehicle 20 below a lower portion of a sloped windshield 21. Looking through the
  • Windscreen 21 the driver 30 looks into a portion 12 a of a
  • Beam path 12 wherein a projector 3 of the head-up display 10 light beam to Display of images in the beam path 12 can send.
  • the driver 30 can recognize a virtual image 16 of displayed information only when the eyes 32 of the driver 30 are located in a vertical region 14. Because the beam path 12 is divided by reflective optical elements 4, 5 and 6 and by the windshield 21 into a plurality of sections 12a-12e
  • the reflective optical elements 4,5,6 light in the beam path 12 is deflected several times and thus the beam path 12 folded several times.
  • the reflective optical elements used so far for folding the beam path are conventional mirrors 4, 5 and lenses 6. They often also have a magnifying imaging function. This allows the light path for an optical
  • the reflective elements 4, 5, 6 are intended to reflect irradiated light as completely as possible, in particular at almost every angle of incidence. They therefore form end points of the sections of the beam path on which
  • Beams are diverted from one section to the next. Due to their reflective properties, they essentially reflect light from arbitrary directions, which is why display devices are usually protected from unfavorable light radiation from their surroundings by means of diaphragms. Because of their reflection at any Einstrahlwinkeln Wrkung must not protrude into a portion of the beam path in which they are not intended for deflection or imaging. Because these reflective elements 4, 5, 6, 6 substantially reflect any incident light, none is allowed to protrude into a portion 12a-12e for which it is not intended to be the starting or ending point of the section.
  • the folding of the beam path 12 makes it possible to adapt the head-up display 10 with regard to shape and size to an installation location in the vehicle 20.
  • a shortening of a beam path by means of conventional optical elements are limited in that e.g. a larger number of e.g. Mirroring or e.g. a stronger optical magnification at the same time disadvantages such. larger
  • FIG. 1 b shows how the size of the head-up display 10 can affect the display of information for the driver 30.
  • the virtual image area 17 of the head-up display could either be moved into the area 18 (arrow B) or around the Area 18 are enlarged.
  • the housing 2 of the head-up display 10 requires at the shifted position, a volume 2a, which is already partially occupied by other parts, in particular by a handlebar 22, which can hardly be positioned differently.
  • FIG. 2 shows a vehicle 20 with a first embodiment of a vehicle
  • Head-up displays 1 which is also arranged in a region below a windshield 21. From a main mirror 4, the head-up display 1 radiates beams into a section 12 b of the beam path 12 to the windshield 21. This reflects the beams coming out of the head-up
  • Projector 3 further optical elements 5, 7, and 8 are arranged, which the beam path 12 in further sections, for. B. 12c, 12d and 12e, subdivide.
  • the projector may include a laser (not shown) and an LCD display (not shown), the light beam of the laser continuously scanning the surface of the LCD display and passing through pixels. The projector 3 illuminates one
  • a holographic optical element 8 e.g. a holographic lens.
  • Holographic diffuser 8 occur.
  • the support of the holographic optical element 8 is preferably a thin planar disk of a clear transparent glass material, for example Plexiglas or polycarbonate.
  • the holographic optical element 8 is designed to be reflective and thus contributes to the space-saving folding of the beam path 12.
  • transparent carrier formed diffraction structure can e.g. from a
  • the optical imaging function of the holographic optical element 8 is only available if further optical elements are suitably positioned with respect to the holographic optical element. Therefore, the deflection mirror 5, the holographic optical element 8 and the deflection mirror 7 are in a manner in the
  • Head-up display 1 incorporated that a predetermined angle of incidence and a predetermined angle of reflection in accordance with the diffraction conditions of the holographic optical element 8 of the sections 12e and 12d of the beam path through the arrangement of the deflection mirrors 7 and 5 with respect to the holographic optical Elements 8 are complied with.
  • the section 12d corresponds to a second section of the beam path.
  • intermediate images are formed by a combination of reflection, diffraction and interference, whereby at a given wavelength the angle of incidence and the angle of reflection with respect to the holographic optical element is determined for optical imaging.
  • the deflecting mirror 5 is provided to direct light irradiated from the holographic optical element 8 toward the main mirror 4.
  • the light emitted by the deflecting mirror 5 illuminates the holographic optical element 8 and can at least partially illuminate the area of the holographic optical element 8. Therefore, the portion 12c corresponds to the third portion of the beam path.
  • the carrier of the holographic optical element e.g. a plastic glass pane, preferably protrudes beyond a maximum possible beam cross section of the portion 12 c to image distortion of
  • the deflecting mirror 5 directs light rays in directions onto the holographic optical element 8 and its carriers which deviate from the diffraction conditions of the holographic optical element 8 with respect to their angles of incidence. Since this is only possible to a limited extent in the arrangement shown in FIG. 2, the diffraction efficiency of the holographic optical element 8 is preferably reduced in such a way that diffraction losses in the
  • Section 12c have only a negligible effect on the visibility of the display.
  • the reduced diffraction efficiency of the holographic optical element 8 also causes intensity losses between the beams of the sections 12e and 12d, which can be compensated by the projector 3, for example, by a more intense light emission.
  • FIG. 3 shows a second embodiment of a device according to the invention
  • Head-up displays 1 The arrangement of the head-up display 1 in the vehicle 20 relative to a Wndschutzopathy 21 and a driver 30 agrees with that previously described with respect to Figure 2, which is why hereinafter only on the internal structure of the head-up display 1 is received.
  • the head-up display 1 has a projector 3, of which several
  • the main mirror 4 directs that Light-imaging beam on the windshield 21st
  • the projector 3 radiates light beam onto the mirror 7, which preferably has an image-enlarging effect.
  • the mirror 7 redirects irradiated light beams to the holographic optical element 8.
  • the mirror 7 and the holographic optical element 8 are arranged such that light rays emanating from the mirror 7 on the holographic optical element 8 with
  • Incident angles which correspond to the diffraction conditions for a holographic reproduction of the optical imaging function of the holographic optical
  • Elements 8 correspond.
  • the mirror 9 is arranged with respect to the holographic optical element 8 such that at its mirror surface by
  • Reflection, diffraction and interference the optical imaging function e.g. a
  • the holographic optical element 8 is displayed as a virtual image.
  • the deflection mirror deflects 9 imaging beam to the next deflection mirror 5 and only the deflection mirror 5 is intended to direct imaging light beams at such an angle to the holographic optical element 8 that they are not diffracted when passing the holographic optical element 8.
  • the advantage of this head-up display according to the invention is that the deflection mirror 5 can be arranged more favorably on the deflection mirror 9 by means of an additional deflection of imaging beam bundles, in order to ensure that the deflection mirror 5 is in the third
  • Section 12c of the beam path 12 radiated beam only with
  • Illuminate angles at the holographic optical element 8 which differ sufficiently from the diffraction conditions of the holographic optical element 8 to avoid diffraction effects. This allows the
  • Beam radiation 12 which can keep energy consumption and heat generation to advantageously low values.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Instrument Panels (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

L'invention concerne un dispositif d'affichage (1), en particulier un affichage tête haute, comportant une source d'images (3) émettant de la lumière et des éléments optiques (4, 5, 6, 7, 8, 9) qui représentent un chemin optique (12) pour les faisceaux de rayons. Selon l'invention, les éléments optiques (4, 5, 6, 7, 8, 9) comprennent un élément optique holographique (8) doté d'une fonction d'imagerie optique prédéterminée et un réflecteur (5). L'élément optique holographique (8) est positionné sur le chemin optique (12) à distance du réflecteur (5). En outre, l'élément optique holographique (8) est agencé sur le chemin optique (12) de telle manière que les faisceaux de rayons d'un premier tronçon du chemin optique sont dirigés sur l'élément optique holographique (8) pour qu'ils soient déviés dans une nouvelle direction sur un deuxième tronçon du chemin optique sous l'effet de la fonction d'imagerie de l'élément optique holographique (8). Le réflecteur (5) et l'élément optique holographique (8) sont agencés l'un par rapport à l'autre de telle manière que des faisceaux de rayons émis par le réflecteur (5) dans un troisième tronçon du chemin optique (12) peuvent éclairer au moins en partie l'élément optique holographique, les angles d'éclairage des faisceaux de rayons servant à éclairer du troisième tronçon du chemin optique (12) étant sensiblement différents des angles d'incidence, pour lesquels la fonction d'imagerie de l'élément optique holographique (8) exerce un effet.
PCT/EP2012/054788 2011-05-16 2012-03-19 Affichage tête haute comportant des éléments optiques holographiques Ceased WO2012156124A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201280023445.0A CN103534632A (zh) 2011-05-16 2012-03-19 具有全息光学元件的hud

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011075884.4 2011-05-16
DE201110075884 DE102011075884A1 (de) 2011-05-16 2011-05-16 HUD mit holographischen optischen Elementen

Publications (1)

Publication Number Publication Date
WO2012156124A1 true WO2012156124A1 (fr) 2012-11-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/054788 Ceased WO2012156124A1 (fr) 2011-05-16 2012-03-19 Affichage tête haute comportant des éléments optiques holographiques

Country Status (3)

Country Link
CN (1) CN103534632A (fr)
DE (1) DE102011075884A1 (fr)
WO (1) WO2012156124A1 (fr)

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WO2019096492A1 (fr) * 2017-10-02 2019-05-23 Visteon Global Technologies, Inc. Dispositif d'affichage optique du type tête haute
WO2021233713A1 (fr) 2020-05-18 2021-11-25 Saint-Gobain Glass France Vitre composite pour un affichage tête haute holographique
WO2021245031A1 (fr) 2020-06-03 2021-12-09 Saint-Gobain Glass France Vitre composite dotée d'un élément hologramme
WO2021254872A1 (fr) 2020-06-15 2021-12-23 Saint-Gobain Glass France Verre feuilleté doté d'un élément holographique et procédé de fabrication
WO2021254873A1 (fr) 2020-06-15 2021-12-23 Saint-Gobain Glass France Panneau composite avec un élément holographique et procédé pour sa production
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WO2022053404A1 (fr) 2020-09-14 2022-03-17 Saint-Gobain Glass France Procédé de production d'une vitre composite dotée d'un hologramme
WO2022053548A1 (fr) 2020-09-14 2022-03-17 Saint-Gobain Glass France Procédé et dispositif de revêtement d'une plaque incurvée avec un matériau photosensible
WO2022053403A1 (fr) 2020-09-14 2022-03-17 Saint-Gobain Glass France Panneau composite pour affichage tête haute holographique
WO2022101194A1 (fr) 2020-11-11 2022-05-19 Saint-Gobain Glass France Vitre stratifiée comprenant un élément d'hologramme et un élément fonctionnel électrochrome
WO2023144084A1 (fr) 2022-01-26 2023-08-03 Saint-Gobain Glass France Procédé de fabrication de vitre composite comprenant au moins un hologramme
WO2023144085A1 (fr) 2022-01-26 2023-08-03 Saint-Gobain Glass France Vitre composite dotée d'un élément hologramme et d'un revêtement antireflet
WO2023208962A1 (fr) 2022-04-27 2023-11-02 Saint-Gobain Glass France Vitre composite dotée d'une couche réfléchissante et d'un élément holographique
WO2023247267A1 (fr) 2022-06-21 2023-12-28 Saint-Gobain Glass France Vitre composite dotée d'un élément hologramme
WO2023247264A1 (fr) 2022-06-21 2023-12-28 Saint-Gobain Glass France Vitre composite dotée d'un élément hologramme et d'une couche à forte réfraction optique
WO2024245672A1 (fr) 2023-05-30 2024-12-05 Saint-Gobain Glass France Plaque, dispositif et procédé de stabilisation thermique d'un élément hologramme
WO2024256243A1 (fr) 2023-06-15 2024-12-19 Saint-Gobain Glass France Procédé de production de panneau composite pour affichage tête haute holographique, et panneau composite
EP4530061A1 (fr) 2023-09-27 2025-04-02 Saint-Gobain Glass France Vitre composite pour un affichage tête haute holographique

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