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WO2015125247A1 - Dispositif de projection - Google Patents

Dispositif de projection Download PDF

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Publication number
WO2015125247A1
WO2015125247A1 PCT/JP2014/054009 JP2014054009W WO2015125247A1 WO 2015125247 A1 WO2015125247 A1 WO 2015125247A1 JP 2014054009 W JP2014054009 W JP 2014054009W WO 2015125247 A1 WO2015125247 A1 WO 2015125247A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
concave mirror
image light
image
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2014/054009
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English (en)
Japanese (ja)
Inventor
柳澤　琢麿
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.)
Pioneer Corp
Original Assignee
Pioneer Corp
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 Pioneer Corp filed Critical Pioneer Corp
Priority to PCT/JP2014/054009 priority Critical patent/WO2015125247A1/fr
Publication of WO2015125247A1 publication Critical patent/WO2015125247A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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 present invention relates to a head-up display.
  • a head-up display (hereinafter also referred to as “HUD”) is an image (real image) projected on a screen of a liquid crystal display or a projector by a half mirror called a combiner placed in front of the driver's field of view.
  • HUD head-up display
  • the eyepiece optical system is configured as a magnifying optical system using a lens, a concave mirror, etc. in order to increase the size of the virtual image relative to the real image or to form the virtual image far away as viewed from the driver. Is common.
  • the current HUD eyepiece optical system can be classified into two types: a dedicated combiner method and a windshield combiner method.
  • the dedicated combiner system shown in FIG. 1 can realize the simplest eyepiece optical system because it can have a combiner function and a magnifying optical system function at the same time by making the combiner a concave half mirror.
  • the dedicated combiner is placed in a position where it can be seen by the driver (such as on the dashboard), a very large combiner cannot be installed. As a result, there is a drawback that it is difficult to increase the virtual image size (view angle).
  • the windshield combiner system shown in FIG. 2 uses the windshield as a combiner.
  • the combiner is very large, the curvature of the windshield of a general vehicle is very loose, so it is not possible to configure a magnifying optical system with only the windshield, and a magnifying optical element such as a concave mirror is separately provided. Must be used together.
  • the concave mirror can be placed in a position that is not visible to the driver (such as in the dashboard), a somewhat large concave mirror can be used. As a result, there is a high possibility that a virtual image larger than the dedicated combiner method can be realized.
  • the concave mirror is decentered with respect to the screen (real image), that is, the screen is arranged at a position off the optical axis of the concave mirror (for example, see Patent Document 1).
  • Patent Document 2 describes a technique related to the present invention.
  • the concave mirror that fits in the dashboard must be quite large.
  • the screen and the concave mirror must be shifted so as not to block the reflected light from the concave mirror, the size of the optical unit, especially the size in the front-rear direction of the vehicle, becomes very large and fits in the dashboard. There was no problem. Conversely, when the optical unit is actually sized to fit on the dashboard, there is a problem that a very large virtual image size cannot be realized.
  • the invention described in claim is a projection device, comprising: a light source that emits circularly polarized image light; a screen that has circular dichroism and reflects image light emitted from the light source; and the screen. And a concave mirror that reverses and reflects the turning direction of the circularly polarized light of the reflected image light, and at least a part of the screen is disposed in a region in which the image light reflected by the concave mirror travels, Is characterized in that it reflects image light emitted from the light source and transmits image light reflected by the concave mirror.
  • An example of a dedicated combiner type HUD is shown.
  • An example of a windshield combiner type HUD is shown.
  • the structure of HUD of 1st Example is shown.
  • the structure of the optical unit of HUD shown in FIG. 3 is shown.
  • the layer structure of the screen is shown. It is a graph which shows the transmittance
  • the structure of HUD of 2nd Example is shown.
  • the projection device includes a light source that emits circularly polarized image light, a screen that has circular dichroism and reflects the image light emitted from the light source, and is reflected by the screen. And a concave mirror that reverses and reflects the rotational direction of the circularly polarized light of the image light, and at least a part of the screen is disposed in a region in which the image light reflected by the concave mirror travels, and the screen The image light emitted from the light source is reflected and the image light reflected by the concave mirror is transmitted.
  • the above projector reflects the circularly polarized image light emitted from the light source with the screen, and further reflects with the concave mirror for output.
  • the concave mirror reverses the turning direction of the circularly polarized light of the image light reflected by the screen.
  • the image light reflected by the concave mirror is reflected by a windshield or the like and visually recognized as a virtual image by the driver. Since the screen has circular dichroism and has the property of transmitting the light reflected by the concave mirror, the screen blocks the image light even if the screen is placed in the area where the image light reflected by the concave mirror travels. Therefore, the shadow of the screen does not occur in the virtual image. Therefore, by arranging the screen in the path of the image light from the concave mirror, the entire projection apparatus can be reduced in size.
  • the image light emitted from the light source is emitted toward the screen through a part of the concave mirror.
  • an opening is provided in the concave mirror, and image light emitted from the light source is emitted toward the screen through the opening.
  • the entire apparatus can be further miniaturized by arranging the light source immediately behind the concave mirror.
  • the concave mirror and the screen have curved surfaces, and the concave mirror and the screen have an optical path length until the image light reflected by the screen reaches the concave mirror. All of the above pixels are arranged to be equal. Thereby, the field curvature of the virtual image visually recognized by the driver can be reduced.
  • the curved surfaces of the concave mirror and the screen have a curved shape with the same center direction of curvature.
  • Another aspect of the above projection apparatus includes a ⁇ / 4 plate that converts image light reflected by the concave mirror into S-polarized light.
  • the circularly polarized image light reflected by the concave mirror is converted to S-polarized light by the ⁇ / 4 plate.
  • the reflectance by the windshield is higher for the S-polarized light than for the P-polarized light. Therefore, the virtual image visually recognized by the driver can be brightened by outputting the image light converted into S-polarized light by the ⁇ / 4 plate.
  • FIG. 3 shows the configuration of the HUD according to the first embodiment of the present invention.
  • This HUD is a windshield combiner system, and projects image light from the optical unit 10 onto the windshield 4 of the vehicle.
  • the windshield acts as a combiner and makes the driver 2 visually recognize a virtual image of the image light.
  • the optical unit 10 is provided in the dashboard 3 of the vehicle.
  • FIG. 4 shows the configuration of the optical unit 10.
  • the optical unit 10 includes a projector 11, a concave mirror 12, and a screen 13.
  • the optical unit 10 of this embodiment constitutes a Cassegrain optical system.
  • the Cassegrain optical system is an optical system that is used in reflective telescopes, etc., with a secondary mirror facing the optical axis of the primary mirror, and taking out the light beam from the center opening of the primary mirror to the back side of the mirror surface. It is an optical system that leads to the eyepiece.
  • the concave mirror corresponds to the primary mirror
  • the screen 13 corresponds to the secondary mirror.
  • the projector 11 is preferably a laser scan (raster scan) type projector, and emits circularly polarized light as the image light L1. Note that not only a laser projector but also a projection-type projector can be used.
  • the concave mirror 12 is disposed in front of the projector 11 and totally reflects incident light. At that time, the concave mirror 12 has a characteristic of reversing the turning direction of the incident circularly polarized light.
  • the concave mirror 12 is provided with a small opening 12x at the center, and the image light L1 emitted from the projector 11 is irradiated onto the screen 13 through the opening 12x.
  • the screen 13 has circular dichroism, and for example, a cholesteric liquid crystal screen is used.
  • a cholesteric liquid crystal screen described in JP-A-2006-163165 can be used.
  • “circularly polarized dichroism” refers to the property of reflecting one of left-turning and right-turning circularly polarized incident light and transmitting the other.
  • the cholesteric liquid crystal screen 13 has a property of reflecting right circularly polarized light and transmitting left circularly polarized light.
  • the screen 13 has a diffusibility by dispersing the spiral direction of molecules of the cholesteric liquid crystal to some extent, and also functions as a diffusion plate.
  • the screen 13 has a three-layer structure as shown in FIG. That is, the screen 13 has a three-layer structure of a cholesteric liquid crystal layer 13R for red (R), a cholesteric liquid crystal layer 13G for green (G), and a cholesteric liquid crystal layer 13B for blue (B).
  • the order of stacking the liquid crystal layers 13R, 13G, and 13B may be any order.
  • the projector 11 emits right circularly polarized image light L1.
  • This image light travels through the opening 12x of the concave mirror 12 and enters the screen 13 at a point P2.
  • the screen 13 has a characteristic of reflecting the right circularly polarized light
  • the image light L1 is diffusely reflected by the screen 13 while being right circularly polarized, and is irradiated to the concave mirror 12 as the image light L2.
  • the image light L2 is reflected at a point P3 on the concave mirror 12 and becomes image light L3.
  • the concave mirror 12 reverses the circular polarization rotation direction of the image light L2, the concave mirror 12 outputs the image light L3 converted from right circular polarization to left circular polarization.
  • Part of the image light L3 reflected by the concave mirror 12 proceeds to the windshield 4 as it is, and part of the image light L3 is irradiated to the screen 13, but as described above, the screen 13 has a property of transmitting left circularly polarized light.
  • the image light L 3 passes through the screen 13.
  • the image light L3 is reflected by the windshield functioning as a combiner and is visually recognized by the driver.
  • the screen 13 transmits the image light L3 reflected by the concave mirror 12, the image light L3 is not blocked by the screen 13, and the virtual image that the driver visually recognizes should be generated in the center. There is no shadow on the screen 13 or it becomes very thin. Therefore, in the present embodiment, the entire screen 13 or a part of the screen 13 can be disposed in a region where the image light L3 reflected by the concave mirror 12 travels. As a result, the concave mirror 12 and the screen 13 can be arranged coaxially, and the entire optical unit 10 can be reduced in size.
  • the projector 11, the concave mirror 12 and the screen 13 are arranged coaxially along the optical axis AX. Compared to the above, the overall size of the optical unit 10 can be reduced.
  • the eccentric arrangement optical system as shown in FIG. 2 since the vertical direction is decentered, it is difficult to design and manufacture.
  • the optical system of the present embodiment is coaxial and rotationally symmetric, there are advantages in that the difficulty of design and manufacture is reduced and the magnification of the magnifying optical system can be easily increased. As a result, a concave mirror or a small screen having a shorter radius of curvature can be used, so that the size of the optical unit 10 can be further reduced.
  • the optical path length until the light diffusely reflected from the pixels on the screen 13 is reflected by the concave mirror 12, that is, the distance from the point P2 to the point P3 is substantially equal for all the pixels.
  • the curved surfaces of the concave mirror 12 and the screen 13 are formed.
  • the center of curvature of the curved surface of the concave mirror 12 and the center of curvature of the curved surface of the screen 13 are in the same direction. Thereby, the curvature of field of the virtual image visually recognized by the driver can be reduced.
  • the light beam traveling from the optical unit 10 toward the windshield 4 has a considerably deep (large) incident angle and reflection angle with respect to the windshield 4. It is likely to be 60 degrees or more.
  • the incident angle and the reflection angle refer to angles formed by the normal to the surface of the windshield 4 and the incident light or reflected light (see FIG. 6).
  • FIG. 6 shows the relationship between the incident angle to the windshield 4 and the reflectance.
  • the graph Ts shows the transmittance of S-polarized light
  • the graph Tp shows the transmittance of P-polarized light
  • the graph Rs shows the reflectance of S-polarized light
  • the graph Rp shows the reflectance of P-polarized light.
  • the light beam output from the optical unit 10 toward the windshield 4 is also circularly polarized light.
  • the reflectance at the windshield 4 is an average value of S-polarized light and P-polarized light.
  • the reflectance Rp of the P-polarized light is low, and the average reflectance is also lowered due to this, and the virtual image visually recognized by the driver becomes dark. .
  • a ⁇ / 4 plate 14 is installed in the vicinity of the exit of the dashboard 3 as shown in FIG. Specifically, the ⁇ / 4 plate is arranged so that the image light L3 output from the display unit 10 reaches the windshield 4 after passing through the ⁇ / 4 plate 14. Thereby, the image light L3 output from the optical unit 10 is converted from circularly polarized light to S polarized light by the ⁇ / 4 plate 14. As shown in FIG. 6, since the reflectance Rs of S-polarized light is higher than the reflectance Rp of P-polarized light, the reflectance of image light by the windshield 4 is increased, and the virtual image visually recognized by the driver is brightened.
  • the screen 13 made of cholesteric liquid crystal has a property of reflecting right circularly polarized light and transmitting left circularly polarized light.
  • the screen 13 may be configured to reflect the left circularly polarized light and transmit the right circularly polarized light by changing the winding direction of the spiral formed by the arrangement direction of the cholesteric liquid crystal molecules.
  • the projector 11 may emit left circularly polarized image light.
  • the screen 13 is irradiated with the image light from the projector 11 through the opening 12x provided at the center of the concave mirror 12.
  • the application of the present invention is not limited to this, and the projector 11 is placed outside the concave mirror 12. It is good also as a structure which irradiates image light to the screen 13 from the outer side of the concave mirror 12. FIG. Even in this case, in the present invention, since the screen 13 can be disposed in the region of the light beam reflected by the concave mirror 12 and directed to the windshield 4, the entire optical unit 10 can be reduced in size accordingly.
  • the present invention can be used for a head-up display (HUD) and a head-mounted display (HMD).
  • HUD head-up display
  • HMD head-mounted display

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

L'invention concerne un dispositif de projection qui sort une lumière d'image polarisée circulairement émise par une source lumineuse par la réflexion de ladite lumière d'image par un écran, puis par un miroir concave. Ledit miroir concave inverse la latéralité de la lumière d'image polarisée circulairement réfléchie par l'écran. La lumière d'image réfléchie par le miroir concave est réfléchie par un pare-brise ou analogue et observée par un conducteur, formant une image virtuelle. L'écran montre un dichroïsme circulaire et a la propriété de transmettre la lumière réfléchie par le miroir concave, de sorte que même si l'écran est situé à l'intérieur de la région à travers laquelle la lumière d'image réfléchie par le miroir concave passe, l'écran ne produise pas d'ombre dans l'image virtuelle.
PCT/JP2014/054009 2014-02-20 2014-02-20 Dispositif de projection Ceased WO2015125247A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/054009 WO2015125247A1 (fr) 2014-02-20 2014-02-20 Dispositif de projection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/054009 WO2015125247A1 (fr) 2014-02-20 2014-02-20 Dispositif de projection

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017204494A1 (fr) * 2016-05-23 2017-11-30 Lg Electronics Inc. Affichage tête haute pour véhicule
WO2018143231A1 (fr) * 2017-01-31 2018-08-09 大日本印刷株式会社 Dispositif d'affichage, dispositif de projection et corps mobile
WO2018155766A1 (fr) * 2017-02-23 2018-08-30 엘지전자 주식회사 Visualisation tête haute pour véhicule
JP2018180253A (ja) * 2017-04-12 2018-11-15 矢崎総業株式会社 車両用表示装置
CN109298529A (zh) * 2018-01-18 2019-02-01 京东方科技集团股份有限公司 抬头显示系统、驱动方法、交通工具及计算机产品
WO2019228488A1 (fr) * 2018-05-31 2019-12-05 京东方科技集团股份有限公司 Système et procédé d'affichage tête haute, véhicule, dispositif d'affichage tête haute, et support de stockage lisible par ordinateur
CN111240143A (zh) * 2020-04-10 2020-06-05 中航国画（上海）激光显示科技有限公司 一种激光投影机及方法
CN115128814A (zh) * 2016-09-06 2022-09-30 麦克赛尔株式会社 平视显示器
WO2023061079A1 (fr) * 2021-10-14 2023-04-20 华为技术有限公司 Appareil d'affichage, dispositif électronique et véhicule
US20230341758A1 (en) * 2020-12-31 2023-10-26 Huawei Technologies Co., Ltd. Display system
WO2024112930A1 (fr) * 2022-11-22 2024-05-30 Atieva, Inc. Affichage tête haute de pare-brise compact à large champ de vision avec écran d'image intermédiaire réfléchissant hybride

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07174973A (ja) * 1993-12-21 1995-07-14 Olympus Optical Co Ltd 視覚表示装置
JPH08122694A (ja) * 1994-10-21 1996-05-17 Matsushita Electric Ind Co Ltd ヘッドアップディスプレイの合成器
JPH1010465A (ja) * 1996-04-24 1998-01-16 Sharp Corp 光学装置および該光学装置を用いた頭部搭載型ディスプレイ
JP2006091489A (ja) * 2004-09-24 2006-04-06 Nippon Seiki Co Ltd 表示装置
JP2007512581A (ja) * 2003-11-26 2007-05-17 ルール カンパニーズ， インコーポレイテッド 実世界シミュレーションのための改良型視準光学部材

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07174973A (ja) * 1993-12-21 1995-07-14 Olympus Optical Co Ltd 視覚表示装置
JPH08122694A (ja) * 1994-10-21 1996-05-17 Matsushita Electric Ind Co Ltd ヘッドアップディスプレイの合成器
JPH1010465A (ja) * 1996-04-24 1998-01-16 Sharp Corp 光学装置および該光学装置を用いた頭部搭載型ディスプレイ
JP2007512581A (ja) * 2003-11-26 2007-05-17 ルール カンパニーズ， インコーポレイテッド 実世界シミュレーションのための改良型視準光学部材
JP2006091489A (ja) * 2004-09-24 2006-04-06 Nippon Seiki Co Ltd 表示装置

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10012836B2 (en) 2016-05-23 2018-07-03 Lg Electronics Inc. Head up display for vehicle
WO2017204494A1 (fr) * 2016-05-23 2017-11-30 Lg Electronics Inc. Affichage tête haute pour véhicule
CN115128814B (zh) * 2016-09-06 2023-09-15 麦克赛尔株式会社 平视显示器
CN115128814A (zh) * 2016-09-06 2022-09-30 麦克赛尔株式会社 平视显示器
WO2018143231A1 (fr) * 2017-01-31 2018-08-09 大日本印刷株式会社 Dispositif d'affichage, dispositif de projection et corps mobile
JPWO2018143231A1 (ja) * 2017-01-31 2019-11-14 大日本印刷株式会社 表示装置、投射装置および移動体
US11333884B2 (en) 2017-02-23 2022-05-17 Lg Electronics Inc. Head up display for vehicle
WO2018155766A1 (fr) * 2017-02-23 2018-08-30 엘지전자 주식회사 Visualisation tête haute pour véhicule
JP2018180253A (ja) * 2017-04-12 2018-11-15 矢崎総業株式会社 車両用表示装置
US10613324B2 (en) 2017-04-12 2020-04-07 Yazaki Corporation Vehicle display device
DE102018205371B4 (de) 2017-04-12 2022-12-22 Yazaki Corporation Fahrzeuganzeigevorrichtung
CN109298529A (zh) * 2018-01-18 2019-02-01 京东方科技集团股份有限公司 抬头显示系统、驱动方法、交通工具及计算机产品
US11320901B2 (en) 2018-05-31 2022-05-03 Boe Technology Group Co., Ltd. Head-up display system and display method, vehicle, head-up display device, and computer-readable storage medium
WO2019228488A1 (fr) * 2018-05-31 2019-12-05 京东方科技集团股份有限公司 Système et procédé d'affichage tête haute, véhicule, dispositif d'affichage tête haute, et support de stockage lisible par ordinateur
CN111240143A (zh) * 2020-04-10 2020-06-05 中航国画（上海）激光显示科技有限公司 一种激光投影机及方法
US20230341758A1 (en) * 2020-12-31 2023-10-26 Huawei Technologies Co., Ltd. Display system
WO2023061079A1 (fr) * 2021-10-14 2023-04-20 华为技术有限公司 Appareil d'affichage, dispositif électronique et véhicule
WO2024112930A1 (fr) * 2022-11-22 2024-05-30 Atieva, Inc. Affichage tête haute de pare-brise compact à large champ de vision avec écran d'image intermédiaire réfléchissant hybride

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