WO2015076144A1 - Afficheur - Google Patents

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Publication number
WO2015076144A1
WO2015076144A1 PCT/JP2014/079783 JP2014079783W WO2015076144A1 WO 2015076144 A1 WO2015076144 A1 WO 2015076144A1 JP 2014079783 W JP2014079783 W JP 2014079783W WO 2015076144 A1 WO2015076144 A1 WO 2015076144A1
Authority
WO
WIPO (PCT)
Prior art keywords
display
optical element
light
display light
display device
Prior art date
Application number
PCT/JP2014/079783
Other languages
English (en)
Japanese (ja)
Inventor
小幡　雅人
高橋　祐一
Original Assignee
日本精機株式会社
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 日本精機株式会社 filed Critical 日本精機株式会社
Publication of WO2015076144A1 publication Critical patent/WO2015076144A1/fr

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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
    • 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
    • G02B2027/0123—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
    • G02B2027/0154—Head-up displays characterised by mechanical features with movable 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
    • G02B27/0149—Head-up displays characterised by mechanical features
    • G02B2027/0154—Head-up displays characterised by mechanical features with movable elements
    • G02B2027/0159—Head-up displays characterised by mechanical features with movable elements with mechanical means other than scaning means for positioning the whole image
    • 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
    • G02B27/0179—Display position adjusting means not related to the information to be displayed
    • G02B2027/0181—Adaptation to the pilot/driver

Definitions

  • the present invention relates to a display device, and more particularly to a display device that displays a virtual image by projecting display light from a display element onto a transparent member.
  • Patent Document 1 a display device disclosed in Patent Document 1 is known as this type of display device.
  • the display light from the display element is reflected by the reflecting portion and projected onto the transparent member.
  • the reflecting portion is rotatable and the height of the display position of the virtual image is adjusted according to the rotation of the reflecting portion.
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a display device capable of displaying a virtual image at an equivalent position to users having different viewpoint heights.
  • a display device includes: A display device that emits display light representing an image toward a transparent member and displays a virtual image of the image by display light reflected by the transparent member, Display means for emitting display light representing the image; An optical element on which the display light emitted from the display means is incident and transmits the incident display light to be emitted, wherein the transparent member is changed by changing an angle of the optical axis of the emitted light with respect to the optical axis of the incident light.
  • An optical element that emits display light toward The optical element can be translated, and an optical path of display light emitted from the optical element and reflected by the transparent member changes according to the translation of the optical element. It is characterized by that.
  • FIG. 1 It is a figure for demonstrating the display mode of the display apparatus which concerns on one Embodiment of this invention. It is a schematic block diagram of the display apparatus which concerns on one Embodiment of this invention.
  • (A) is a figure for demonstrating the usefulness of the display apparatus which concerns on one Embodiment of this invention
  • (b) is a figure for demonstrating the problem which had arisen with the display apparatus which concerns on a prior art example. is there. It is a figure for demonstrating the relationship between the incident light with respect to a display element, and emitted light.
  • (A) And (b) is a figure which shows the modification of a display element.
  • the display device 1 is configured as a head-up display device disposed on the dashboard of the vehicle 2, and emits display light L representing a predetermined image toward the windshield 3 (windshield).
  • the virtual image V of the image is displayed in front of the windshield 3 by the display light L reflected by the windshield 3.
  • the display device 1 configured as a head-up display device causes the user 4 (mainly the driver of the vehicle 2) to visually recognize the virtual image V over the scenery in front of the vehicle 2.
  • the image visually recognized as the virtual image V notifies information (engine speed, navigation information, etc.) regarding the vehicle 2, for example.
  • the display device 1 includes a display 10, a reflection unit 20, an optical path adjustment unit 30, and a housing 40.
  • the vertical direction as viewed from the user 4 viewing the virtual image V is appropriately described as the vertical direction of each member.
  • the display 10 is a liquid crystal display, for example, and includes a liquid crystal display panel 11, a light emitting diode 12, a printed wiring board 13, a diffusion plate 14, and a case body 15.
  • the liquid crystal display panel 11 is obtained, for example, by attaching a polarizing film to a TFT (Thin Film Transistor) type liquid crystal cell.
  • the light emitting diode 12 functions as a backlight that illuminates the liquid crystal display panel 11 from the back side.
  • the light emitting diode 12 is mounted on a printed wiring board 13 located on the back side of the liquid crystal display panel 11.
  • the diffusing plate 14 is a translucent plate material having a diffusing surface composed of fine irregularities, and is located between the light emitting diode 12 and the liquid crystal display panel 11.
  • the diffusion plate 14 diffuses the light emitted from the light emitting diode 12 to reach the liquid crystal display panel 11.
  • the case body 15 holds the liquid crystal display panel 11, the printed wiring board 13, and the diffusion plate 14.
  • the liquid crystal display panel 11 and the light emitting diode 12 are driven by a control unit (not shown).
  • This control unit acquires information about the vehicle 2 from an external device (not shown) such as an ECU (Electronic Control Unit) of the vehicle 2 and displays an image on the liquid crystal display panel 11 according to the acquired information.
  • the control unit switches each pixel of the liquid crystal display panel 11 to a transmission / non-transmission state according to an image to be displayed.
  • the liquid crystal display panel 11 displays an image by transmitting and illuminating the light emitting diode 12.
  • Light (display light L) representing an image displayed on the liquid crystal display panel 11 travels toward the reflection unit 20.
  • the reflecting portion 20 is made of a reflecting mirror in which a reflecting surface is formed by evaporating a metal such as aluminum on a resin such as polycarbonate.
  • the reflecting surface is a concave surface, so that the virtual image V becomes larger than the image displayed on the liquid crystal display panel 11.
  • the reflection unit 20 is located on the rear side of the vehicle 2 with respect to the display 10 and reflects the optical path of the display light L from the display 10 so as to be folded back.
  • the display light L reflected by the reflection surface of the reflection unit 20 travels to the optical path adjustment unit 30.
  • the optical path adjustment unit 30 includes an optical element 31, a holding member 32, and a stepping motor 33, and is positioned between the reflection unit 20 and a translucent cover 41 described later.
  • the optical element 31 is composed of, for example, a holographic optical element (HOE), and emits the incident light while changing the direction at a predetermined angle. Since the holographic optical element can change the traveling direction of light at a relatively deep angle while being a thin sheet, the optical path adjustment unit 30 can be configured compactly.
  • HOE holographic optical element
  • the holding member 32 is made of a resin such as ABS (Acrylonitrile Butadiene Styrene), and includes a stationary portion 32a fixed to the housing 40 and immovable relative to the housing, and a movable portion 32b movable relative to the immobile portion 32a.
  • the movable part 32b moves in the vertical direction with respect to the non-moving part 32a by the rotational power of the stepping motor 33. That is, the movable part 32b is movable in the vertical direction with respect to the housing 40.
  • the movable portion 32b has a window frame shape when viewed from above, and holds the optical element 31 so as to surround the outer edge of the optical element 31. Thereby, the optical element 31 can be translated in the vertical direction with respect to the housing 40.
  • Stepping motor 33 rotates the rotating shaft under the control of the above-described control unit (not shown).
  • a gear 33 a is attached to the rotating shaft, and the movable portion 32 b of the holding member 32 moves up and down by the power of the stepping motor 33 through a gear mechanism (not shown) that is fastened to the gear 33 a.
  • the optical element 31 can be moved in the vertical direction by the optical path adjustment unit 30 configured as described above.
  • the stepping motor 33 rotates the rotation shaft in response to a user operation from an operation unit (push button, switch, etc.) (not shown).
  • the vertical position can be adjusted.
  • the housing 40 fixes and stores each of the display 10, the reflection unit 20, and the optical path adjustment unit 30 at a position satisfying the above-described functions.
  • an emission port 40 a composed of an opening through which the display light L reflected by the reflection unit 20 and transmitted through the optical element 31 is passed.
  • the casing 40 is provided with a translucent cover 41 that covers the emission port 40a.
  • the translucent cover 41 is made of a translucent resin such as acrylic, and transmits the display light L that passes through the optical element 31 and moves upward.
  • the display light L emitted from the display device 10 is transmitted through the translucent cover 41, emitted from the emission port 40 a to the outside of the display device 1, and travels toward the windshield 3.
  • the translucent cover 41 is formed in a curved shape so as not to reflect the reached external light as much as possible in the direction of the user 4.
  • the display light L emitted from the display device 10 is reflected by the reflection unit 20 and travels toward the optical element 31.
  • the emission direction of the display light L transmitted through the optical element 31 is changed with respect to the incident direction (upper left direction in FIG. 2) by the function of the optical element 31 (the emission direction is the upper right direction in FIG. 2).
  • the display light L that has passed through the optical element 31 is emitted from the emission port 40 a and travels toward the windshield 3.
  • the virtual image V is displayed in front of the windshield 3 by the display light L reflected by the windshield 3. In this way, the display device 1 causes the user 4 to visually recognize the virtual image V of the image.
  • the movable portion 32b of the holding member 32 When the movable portion 32b of the holding member 32 is translated downward by the operation of the user 4 from the operation portion and the optical element 31 is positioned below the reference position, as shown in FIGS. 2 and 3A, The optical path between the reflection unit 20 and the optical element 31 is shortened. Then, the display light L1 when the optical element 31 is positioned below the reference position (hereinafter, referred to as “display light L1 at the lower position”) has an optical path whose optical path is shorter than the display light L at the reference position. Therefore, as shown in FIG. 3A, the light is reflected above the windshield 3 rather than the display light L at the reference position.
  • the display light L1 at the lower position reflected by the windshield 3 reaches the user 4 through the optical path above the display light L at the reference position.
  • the virtual image V is visually recognized at the display position equivalent to the user of the average viewpoint.
  • the movable portion 32b of the holding member 32 is translated upward by the operation of the user 4 from the operation portion, and the optical element 31 is positioned above the reference position, as shown in FIGS.
  • the optical path between the reflection unit 20 and the optical element 31 becomes longer.
  • the display light L2 when the optical element 31 is positioned above the reference position (hereinafter referred to as “display light L2 at the upper position”) has an optical path with a longer distance than the display light L at the reference position. Therefore, as shown in FIG. 3A, the reflected light is reflected below the windshield 3 rather than the display light L at the reference position. Thereby, the display light L2 at the upper position reflected by the windshield 3 reaches the user 4 through the optical path below the display light L at the reference position.
  • the virtual image V is visually recognized at the display position equivalent to the user of the average viewpoint.
  • the optical axis position of the display light after passing through the optical element 31 changes according to the vertical position of the optical element 31.
  • the amount of change in the optical axis position is proportional to the amount of parallel movement of the optical element 31, but the angle of the optical axis of the outgoing light (the display light emitted from the optical element 31) with respect to the optical axis of the display light incident on the optical element 31 is determined.
  • the ratio of the movement amount of the optical element 31 to the change amount of the optical axis before and after passing through the optical element 31 is approximately twice or less. It is preferable that Here, as shown in FIG. 4, the optical axis of the display light L incident on the optical element 31 (the optical axis of the incident light) AX1 and the optical axis of the display light L emitted from the optical element 31 (the optical axis of the emitted light).
  • the angle formed by AX2 is ⁇
  • the parallel movement change amount (movement distance) of the optical element 31 is ⁇ h
  • the change amount of the optical axis before and after passing through the optical element 31 the change amount of the optical axis corresponding to ⁇ h.
  • At least ⁇ is preferably 25 degrees or more.
  • ⁇ is 25 degrees or more before and after the passage of the display light.
  • FIG. 3B shows a display device 1P according to a conventional example.
  • the same reference numerals as those of the respective portions of the display device 1 are used for components having the same functions as those of the display device 1 according to the present embodiment. Was attached.
  • the display device 1P according to the conventional example enables the display of the virtual image V according to the viewpoint height of the user 4 by rotating the reflection unit 20 like the display device according to Patent Document 1 described above. It is.
  • the display device 1P according to the conventional example when the reflection unit 20 is rotated clockwise, the display light (display light L1) is reflected on the windshield 3 at a position above the display light L at the reference position. Thereby, it is possible to adjust so that the virtual image V can be seen well even for the user 4 whose viewpoint is higher than the average viewpoint position assumed in advance.
  • the reflecting portion 20 is rotated counterclockwise, the display light (display light L2) is reflected on the windshield 3 at a position below the display light L at the reference position.
  • the reflecting portion 20 is rotated and moved in this way, the display light reflected by the windshield 3 is extended forward in any case where the reflecting portion 20 is rotated clockwise or counterclockwise.
  • the optical path has a position (corresponding point O2 shown in FIG. 3B) corresponding to a position (reference point O1 shown in FIG. 3B) where the display light from the display 10 is incident on the reflecting surface of the reflecting portion 20.
  • the projection of the reflection part 20 is shown with the code
  • the extension optical path forward of the display light reflected by the windshield 3 is bound to the corresponding point O2, and the display light L1 that matches the user 4 with a high viewpoint passes through the corresponding point O2 and becomes a virtual image. Since the display position is shifted downward (see the virtual image V1 in FIG. 3B), the display light L2 that matches the user 4 with a low viewpoint is also visually recognized as a virtual image that has passed through the corresponding point O2. The display position is shifted upward (see the virtual image V2 in FIG. 3B). This problem becomes more prominent as the display position of the set virtual image V becomes farther from the windshield 3.
  • the optical path of the display light is changed by translating the optical element 31 in the vertical direction as described above.
  • the optical path obtained by extending the display light reflected by the windshield 3 forwards the optical path of the display light incident on the windshield 3 in theory.
  • a virtual image V is formed at a position (corresponding point O2 shown in FIG. 3 (a)) corresponding to the position (reference point O1 shown in FIG. 3 (a)) (note that the projection of the optical element 31 is combined with the corresponding point O2). (Indicated by reference numeral 31v in FIG. 3A).
  • the corresponding point O2 is not located between the windshield 3 and the virtual image V, and the corresponding point O2 itself is the imaging position of the virtual image V. That is, the virtual image V is formed at the same position by the optical path of the display light L1 matched to the user 4 with a high viewpoint and the optical path of the display light L2 matched to the user 4 with a low viewpoint. Therefore, according to the display device 1 according to the present embodiment, it is possible to display the virtual image V at the same position on the user 4 having a different viewpoint height.
  • the display device 1 even if the height of the viewpoint of the user 4 is different, the virtual image is visually recognized by the user 4 at the position desired by the device provider simply by adjusting the position of the optical element 31 by parallel movement. Therefore, it is particularly useful when it is desired to display information superimposed on the front scenery using AR (Augmented Reality).
  • AR Augmented Reality
  • the display device 1 is a display device 1 that emits display light L representing an image toward a windshield 3 (an example of a transparent member) and displays a virtual image V of the image by the display light L reflected by the windshield 3.
  • the display device 10 (an example of display means) that emits display light L representing an image, and the optical element 31 that the display light L emitted from the display device 10 enters and transmits and emits the incident display light L.
  • an optical element 31 that emits the display light L toward the windshield 3 by changing the angle of the optical axis AX2 of the outgoing light with respect to the optical axis AX1 of the incident light.
  • the optical path of the display light L emitted from the optical element 31 and reflected by the windshield 3 changes.
  • the display device 1 further includes a reflection unit 20 that reflects the display light L emitted from the display 10 toward the optical element 31, and the optical element 31 is emitted from the display 10 and reflected by the reflection unit 20.
  • the displayed light L is incident.
  • the display device 1 is mounted on the vehicle 2, and the display 10 emits display light L toward the reflection unit 20 located on the rear side of the vehicle 2 with respect to the display 10 and is reflected by the reflection unit 20.
  • the light L passes through the optical element 31 and is emitted toward the windshield 3.
  • the optical element 31 is a holographic optical element has been described above, but is not limited thereto.
  • the optical element is an optical element 31a made up of a wedge-shaped prism as shown in FIG. 5A, or an optical element 31b made up of a Fresnel lens cut into parallel lines as shown in FIG. 5B. May be.
  • the display device 1 may be configured such that the optical element 31 is translated in an oblique direction.
  • the vehicle 2 is an example of a vehicle on which the display device 1 is mounted.
  • the present invention is not limited to this.
  • the display device 1 can also be installed on other vehicles (ships, aircraft, etc.). Furthermore, it is not restricted to what is installed in a vehicle.
  • the display device 1 is disposed in the dashboard of the vehicle 2 .
  • the display device 1 is, for example, a stationary type (retrofitted type) installed on the dashboard of the vehicle. May be.
  • the transparent member that projects the display light L is not limited to the windshield 3, and may be a transparent member (so-called combiner) dedicated to the display device 1.
  • the present invention is applied to a display device, and more specifically, is suitable for a display device that displays a virtual image by projecting display light from a display element onto a transparent member.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Instrument Panels (AREA)

Abstract

La présente invention concerne un afficheur qui peut afficher une image virtuelle dans des positions équivalentes pour des utilisateurs ayant différentes hauteurs de point de vue. Un afficheur (1) émet une lumière (L) d'affichage indiquant une image en direction d'un élément transparent et affiche une image virtuelle de l'image au moyen de la lumière (L) d'affichage réfléchie par l'élément transparent. L'afficheur (1) est doté d'un instrument (10) d'affichage qui émet la lumière (L) d'affichage indiquant l'image et un élément (31) optique qui est un élément (31) optique sur lequel la lumière (L) d'affichage émise par l'instrument (10) d'affichage est incidente et qui transmet et émet la lumière (L) d'affichage incidente et qui émet la lumière (L) d'affichage en direction de l'élément transparent par modification de l'angle d'un axe optique pour la lumière émise par rapport à l'axe optique de la lumière incidente. L'élément (31) optique peut subir un mouvement parallèle et le trajet de la lumière pour la lumière (L) d'affichage émise par l'élément (31) optique et réfléchie par l'élément transparent peut être modifié en fonction du mouvement parallèle de l'élément (31) optique.
PCT/JP2014/079783 2013-11-25 2014-11-11 Afficheur WO2015076144A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013243357A JP6268978B2 (ja) 2013-11-25 2013-11-25 表示装置
JP2013-243357 2013-11-25

Publications (1)

Publication Number Publication Date
WO2015076144A1 true WO2015076144A1 (fr) 2015-05-28

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Application Number Title Priority Date Filing Date
PCT/JP2014/079783 WO2015076144A1 (fr) 2013-11-25 2014-11-11 Afficheur

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JP (1) JP6268978B2 (fr)
WO (1) WO2015076144A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6577041B2 (ja) 2015-09-30 2019-09-18 マクセル株式会社 表示装置および表示像投影方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004020605A (ja) * 2002-06-12 2004-01-22 Denso Corp ヘッドアップディスプレイ
JP2010179918A (ja) * 2010-04-26 2010-08-19 Yazaki Corp 車両用表示装置
JP2012058689A (ja) * 2010-09-13 2012-03-22 Yazaki Corp ヘッドアップディスプレイ

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1018198C2 (nl) * 2001-06-01 2002-12-03 Tno Head mounted display inrichting.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004020605A (ja) * 2002-06-12 2004-01-22 Denso Corp ヘッドアップディスプレイ
JP2010179918A (ja) * 2010-04-26 2010-08-19 Yazaki Corp 車両用表示装置
JP2012058689A (ja) * 2010-09-13 2012-03-22 Yazaki Corp ヘッドアップディスプレイ

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JP6268978B2 (ja) 2018-01-31
JP2015102695A (ja) 2015-06-04

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