WO2021193461A1 - Dispositif d'affichage d'image - Google Patents

Dispositif d'affichage d'image Download PDF

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Publication number
WO2021193461A1
WO2021193461A1 PCT/JP2021/011473 JP2021011473W WO2021193461A1 WO 2021193461 A1 WO2021193461 A1 WO 2021193461A1 JP 2021011473 W JP2021011473 W JP 2021011473W WO 2021193461 A1 WO2021193461 A1 WO 2021193461A1
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WO
WIPO (PCT)
Prior art keywords
image
unit
display device
light
image display
Prior art date
Application number
PCT/JP2021/011473
Other languages
English (en)
Japanese (ja)
Inventor
洋一 尾形
Original Assignee
株式会社小糸製作所
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 株式会社小糸製作所 filed Critical 株式会社小糸製作所
Priority to CN202180024880.4A priority Critical patent/CN115349106A/zh
Publication of WO2021193461A1 publication Critical patent/WO2021193461A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • 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
    • G02B27/02—Viewing or reading apparatus
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/50—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels
    • G02B30/56—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels by projecting aerial or floating images
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers

Definitions

  • the present disclosure relates to an image display device, and particularly to an image display device that superimposes and forms an image of a plurality of images in the depth direction of space.
  • an instrument panel that lights and displays an icon has been used. Further, as the amount of information to be displayed increases, it has been proposed to embed an image display device in the instrument panel or to configure the entire instrument panel with the image display device.
  • HUD Head Up Display
  • Patent Document 1 an optical device for projecting an image onto a wide range of the windshield is required, and it is desired to reduce the size and weight of the optical device.
  • a head-mounted HUD in the shape of glasses is known (see, for example, Patent Document 2).
  • the light emitted from the light source is directly applied to the user's eyes to project an image on the user's retina.
  • the image formation position of the image (aerial image) formed in the air is fixed in the user's field of view and displayed.
  • the degree of freedom of position was low.
  • the aerial image may be displayed at an inappropriate position depending on the intended use of the user and the preference of each individual, and it is difficult to provide an appropriate image viewing experience.
  • an object of the present disclosure is to provide an image display device capable of changing the position of an image projected in space and improving the degree of freedom of the display position.
  • the image display device of the present disclosure is an image display device including a first image projection unit that irradiates the first image and a projection optical unit that projects the light of the first image in the viewpoint direction.
  • the projection is centered on the rotation axis so that the angle ⁇ formed by the traveling direction of the light of the first image projected from the projection optical unit and the central line-of-sight direction from the viewpoint is variable. It is provided with a rotation holding portion that rotatably holds the optical portion sideways.
  • the projection optical unit is rotatably held laterally by the rotation holding unit, the projection position of the first image irradiated from the image projection unit in the air is changed. It is possible, and it is possible to improve the degree of freedom of the display position.
  • an image display device capable of changing the position of an image projected in space and improving the degree of freedom of the display position.
  • FIG. 1 is a schematic plan view of the image display device according to the first embodiment.
  • FIG. 2 is a photograph showing the propagation of the laser beam inside the waveguide.
  • FIG. 3A is a schematic view showing the difference in the imaging direction depending on the angle when the light is reflected an odd number of times inside the waveguide.
  • FIG. 3B is a schematic view showing the difference in the imaging direction depending on the angle when the light is reflected an odd number of times inside the waveguide.
  • FIG. 4A is a schematic view showing the difference in the imaging direction depending on the angle when the light is reflected an even number of times inside the waveguide.
  • FIG. 4B is a schematic view showing the difference in the imaging direction depending on the angle when the light is reflected an even number of times inside the waveguide.
  • FIG. 5 is a photograph showing an embodiment of an image display device.
  • FIG. 6 is a photograph showing how the display position of the first image changes when the rotation angle is changed in the embodiment.
  • FIG. 7 is an optical path diagram of the image display device according to the second embodiment.
  • FIG. 8 is a schematic plan view of the image display device.
  • FIG. 9 is a schematic perspective view showing a change in the imaging position when the rotation support portion is rotated in the image display device.
  • FIG. 1 is a schematic plan view of the image display device 100 according to the present embodiment.
  • the image display device 100 includes a first image projection unit S (an example of an image projection unit), a lens unit L, a waveguide unit G, and a case unit CS.
  • the arrows shown by solid lines in the figure schematically show the path of the light emitted from the first image projection unit S.
  • the arrow shown by the broken line in the figure indicates the direction in which the user visually recognizes the front in the horizontal direction as the front center direction.
  • the rectangular object shown by the alternate long and short dash line in the figure is a virtual line when the waveguide G is rotated by an angle ⁇ as described later.
  • the case part CS is a housing that houses and holds each part.
  • the case portion CS accommodates the first image projection portion S, the lens portion L, and one end of the waveguide portion G inside the case portion CS.
  • the case portion CS rotatably holds one end of the waveguide portion G with the rotation shaft AX as the rotation center.
  • the case portion CS corresponds to the rotation holding portion in the present disclosure.
  • the structure for rotatably holding the waveguide portion G in the case portion CS is not particularly limited, and for example, a structure in which the support shaft provided in the waveguide portion G is pivotally supported by the bearing provided in the case portion CS is used. You may.
  • the waveguide unit G is a member that internally guides the light emitted from the first image projection unit S and projects it in the direction of the user's viewpoint.
  • the waveguide G corresponds to the projection optical section in the present disclosure.
  • one end of the waveguide portion G is rotatably held in the lateral direction with the rotation shaft AX as the rotation center.
  • the background H1 direction in the drawing
  • the partial reflection unit HM is used as an optical element for extracting the light propagating in the waveguide unit G in the viewpoint direction, but a diffraction grating or the like may be used.
  • the reflection unit M is an optical element provided inside the waveguide unit G to reflect light.
  • the waveguide G is formed in a flat plate shape, and the reflection portion M is provided at an angle of 45 degrees with respect to the in-plane direction of the waveguide G. The angle is not limited to 45 degrees with respect to the in-plane direction of the waveguide G.
  • the partial reflection unit HM is an optical element provided inside the waveguide unit G that reflects a part of light and transmits the remaining part. In the example shown in FIG. 1, the partial reflection portion HM is provided at an angle of 45 degrees with respect to the in-plane direction of the waveguide portion G, but the angle of the partial reflection portion HM is the in-plane direction of the waveguide portion G. It is not limited to 45 degrees with respect to.
  • the first image projection unit S is a device that irradiates the light that constitutes the image, and projects the image onto the user's eyes (viewpoint).
  • the first image projection unit S uses a laser light source unit that irradiates a laser beam, causes light to enter the waveguide unit G via the lens unit L, and causes the reflection unit M and partial reflection. The light reflected by the part HM is projected in the viewpoint direction.
  • the lens unit L is an optical element that adjusts the path of the light emitted by the first image projection unit S.
  • the specific configuration of the lens unit L is not limited, and known lenses such as a collimating lens that collimates the laser beam, a convex lens, a concave lens, and an aspherical lens can be used. Further, the lens unit L may include a plurality of lenses.
  • the light including the first image irradiated by the first image projection unit S is incident on one end side of the waveguide unit G via the lens unit L, and is incident on one end side of the waveguide unit M.
  • the light incident on the reflecting portion M is reflected, propagates inside the waveguide portion G, is incident on the partially reflecting portion HM, is re-reflected by the partially reflecting portion HM, is projected in the viewpoint direction, and is visually recognized by the user.
  • the waveguide G When the waveguide G is located at right angles to the line-of-sight direction H1 as shown by the solid line in FIG. 1, the light incident on the reflection unit M at 45 degrees is incident on the partial reflection unit HM at 45 degrees and is in the line-of-sight direction. Reach the viewpoint along H1. Therefore, the user superimposes and visually recognizes the background in the line-of-sight direction H1 and the first image.
  • the incident angle of the light incident on the reflecting portion M and the partial reflecting portion HM changes, so that the partially reflecting portion HM
  • the light projected from the viewpoint to the viewpoint is inclined by a predetermined angle with respect to the line-of-sight direction H1. Therefore, the user visually recognizes the first image at a position shifted laterally from the background in the line-of-sight direction H1.
  • the range of the angle ⁇ is preferably a range of 25 degrees to the left and right (-25 degrees or less ⁇ ⁇ 25 °) with respect to the front center direction from the user's viewpoint. If the angle ⁇ is larger than ⁇ 25 °, the change in the projection position of the first image becomes large, and it becomes difficult to maintain comfort in the superimposed display with the background.
  • FIG. 2 is a photograph showing the propagation of the laser beam inside the waveguide G.
  • the rectangle drawn by the white broken line indicates the cross section of the waveguide portion G
  • the double-headed arrow drawn by the white broken line indicates the traveling direction of the light outside the waveguide portion G.
  • a laser beam was incident on the position of the circle drawn by the white solid line from the lower left in the figure.
  • the laser light propagates to the right while being totally reflected on the main surface, and the light reflected by the partial reflection HM is irradiated downward in the figure.
  • the case portion CS shown in FIG. 1 is rotated in the left-right direction to form the line-of-sight direction H1 and the waveguide G.
  • the corners are changed to change the viewing direction of the first image.
  • FIG. 3A and 3B are schematic views showing the difference in the imaging direction depending on the angle when the light is reflected an odd number of times inside the waveguide G.
  • FIG. 3A shows an example in which the waveguide G is rotated to the side opposite to the user
  • FIG. 3B shows an example in which the waveguide G is rotated to the user side.
  • 4A and 4B are schematic views showing a difference in the imaging direction depending on the angle when light is reflected an even number of times inside the waveguide G.
  • FIG. 4A shows an example in which the waveguide G is rotated to the side opposite to the user
  • FIG. 4B shows an example in which the waveguide G is rotated to the user side.
  • the arrows shown by solid lines in FIGS. 3A, 3B, 4A, and 4B indicate the paths of light emitted from the first image projection unit S during rotation of each waveguide unit G. Similar to FIG. 1, the light incident on the reflection unit M from the lower part in the drawing propagates while being totally reflected on the inner surface of the waveguide G and reaches the partial reflection unit HM, and the light reflected by the partial reflection unit HM is emitted. It is projected toward the viewpoint.
  • the light is projected from the partial reflection unit HM regardless of whether the light is reflected an odd number of times or an even number of times on the main surface of the waveguide G.
  • the traveling angle of the light can be made different from the line-of-sight direction H1 shown in FIG.
  • the light can be projected to the user side at an angle different from the line-of-sight direction H1.
  • FIG. 5 is a photograph showing an embodiment of the image display device 100.
  • the transparent plate-shaped member shown in the figure is the waveguide portion G, and the black housing shown on the right side of the waveguide portion G is the case portion CS.
  • the white solid line shown in the figure shows the inclination of the waveguide G when the rotation angle ⁇ is changed from 0 degrees to 20 degrees around the rotation axis AX.
  • FIG. 6 is a photograph showing how the display position of the first image changes when the rotation angle ⁇ is changed in the embodiment shown in FIG.
  • the photograph shown in FIG. 6 is a photograph in which the line-of-sight direction H1 is visually recognized from the viewpoint and the vicinity of the partial reflection portion HM is enlarged.
  • the white rectangle shown in the figure is the first image projected from the first image projection unit S, and a white triangle is attached to the lower right corner of the first image.
  • the projection direction of the first image projected from the partial reflection unit HM changes, and the user
  • the viewing direction of the first image changes from the viewpoint of.
  • the waveguide portion G which is the projection optical portion
  • the case portion CS which is the rotation holding portion.
  • the projection position of the first image emitted from the projection unit S in the air can be changed, and the degree of freedom of the display position can be improved.
  • FIG. 7 is an optical path diagram of the image display device 110 according to the present embodiment.
  • the image display device 110 includes a first image projection unit S1, a first beam splitter BS1 (an example of a beam splitter), a second beam splitter BS2, a retroreflection unit RR, and a reflection unit M. , With a dichroic mirror DM.
  • the broken line and the alternate long and short dash line in FIG. 7 schematically show the path of the light emitted from the first image projection unit S1.
  • the user visually recognizes the first front image A1 and the first rear image R1 projected from the first image projection unit S1 at different distances from the viewpoint in the depth direction.
  • the direction in which the first front image A1 and the first rear image R1 are lined up is the depth direction
  • the vertical direction of the paper surface orthogonal to the depth direction is the horizontal direction
  • the direction orthogonal to the depth direction and the horizontal direction is the vertical direction.
  • the left and right are expressed toward the depth direction, which is the line-of-sight direction from the viewpoint, but the horizontal direction and the vertical direction are for expressing the positional relationship in FIG. 7, and even if the top, bottom, left, and right are changed. good.
  • the first image projection unit S1 is a device that irradiates light that constitutes an image, and projects an image at a predetermined distance from the user's eyes (viewpoint).
  • the first image projection unit S1 is arranged to the right of the second beam splitter BS2, which will be described later, and emits light laterally to one surface of the second beam splitter BS2 (the surface facing the first beam splitter BS1). Irradiate.
  • the configuration of the first image projection unit S1 is not limited, and may be, for example, a liquid crystal display device provided with a backlight, a self-luminous organic EL display device, a projector device using a light source and a modulation element, or the like.
  • the image projected by the first image projection unit S1 may be a still image or a moving image. Further, the first image projection unit S1 may include an optical member such as a lens.
  • the first beam splitter BS1 is a member that transmits a part of the incident light and reflects a part of it.
  • a partial reflector having a film for adjusting the reflectance formed on the surface of the first beam splitter BS1 may be used.
  • the first beam splitter BS1 is arranged so as to have an angle of 45 degrees with respect to the lateral direction and the depth direction. Further, it is arranged so as to be inclined by 45 degrees with respect to the optical axis of the light emitted from the first image projection unit S1.
  • the second beam splitter BS2 is a member that transmits a part of the incident light and reflects a part of the incident light, and a partial reflector having a film for adjusting the reflectance can be used on the surface.
  • the second beam splitter BS2 is arranged so as to be inclined at an angle of 45 degrees with respect to the lateral direction and the depth direction. Further, it is arranged so as to be inclined by 45 degrees with respect to the optical axis of the light emitted from the first image projection unit S1. Further, the first beam splitter BS1 and the second beam splitter BS2 are arranged to face each other so as to intersect each other at an angle of 90 degrees.
  • the transmittance and reflectance of light in the first beam splitter BS1 and the second beam splitter BS2 can be selected in any balance.
  • both the first beam splitter BS1 and the second beam splitter BS2 have the transmittance. It is 50% and the reflectance is 50%.
  • the first beam splitter BS1 and the second beam splitter BS2 are arranged at an inclination of 45 degrees with respect to the optical axis of the light emitted from the first image projection unit S1 and the first beam.
  • the splitter BS1 and the second beam splitter BS2 are arranged so as to be orthogonal to each other.
  • the arrangement of the first beam splitter BS1 and the second beam splitter BS2 is not limited to this embodiment, and an appropriate angle is used from the relationship between the light irradiation direction from the first image projection unit S1 and the image formation position of the image. Can be done.
  • the first beam splitter BS1 and the second beam splitter BS2 of the present embodiment are plate-shaped beam splitters, but are configured by joining the slopes of two right-angle prisms so as to sandwich a film for adjusting the reflectance. It may be a cube-shaped beam splitter.
  • the retroreflective unit RR is an optical member that reflects incident light in the incident direction.
  • the retroreflective unit RR has a structure in which minute glass beads are spread on the surface side of a reflective film or a structure using a prism. Parts may be used.
  • the retroreflective unit RR is arranged to the right of the first beam splitter BS1.
  • the retroreflective surface of the retroreflective unit RR is orthogonal to the lateral direction.
  • the reflecting unit M is an optical member that specularly reflects the incident light with respect to the incident direction.
  • a mirror having a structure in which the surface of the plate-shaped member is mirror-processed may be used.
  • the reflecting unit M is arranged in the depth direction alongside the first beam splitter BS1 and the second beam splitter BS2, and the reflecting surface of the reflecting unit M is orthogonal to the depth direction.
  • the reflecting portion M is shown in a flat plate shape in FIG. 7, a concave mirror or a convex mirror may be used.
  • the dichroic mirror DM is an optical member that reflects light of a specific wavelength and transmits light of other wavelengths.
  • the dichroic mirror DM is arranged in the left direction of the retroreflective portion RR and the first beam splitter BS1, and is arranged so as to be rotatable in the depth direction.
  • the dichroic mirror DM reflects the wavelength of the light emitted from the first image projection unit S1 and transmits other visible light.
  • the dichroic mirror DM constitutes the projection optical unit in the present disclosure. There is.
  • an imaging lens may be arranged as a part of the imaging optical system between the first beam splitter BS1 and the dichroic mirror DM.
  • the imaging lens is an optical member for forming an image of light traveling from the first beam splitter BS1 at a predetermined position in space. Further, a plurality of lens groups may be used as the imaging lens.
  • the light emitted from the first image projection unit S1 reaches the first beam splitter BS1 after being reflected by the second beam splitter BS2.
  • a part of the light that has reached the first beam splitter BS1 is reflected and travels in the retroreflective portion RR direction, is rereflected by the retroreflective portion RR, and reincidents on the first beam splitter BS1.
  • the light that travels with the optical meridian expanding until it reaches the retroreflective section RR is the first beam splitter BS1 as the light whose light meridian is reduced due to the retroreflective characteristic of the retroreflective section RR. Incident to.
  • the light re-entering the first beam splitter BS1 passes through the first beam splitter BS1 and is reflected by the dichroic mirror DM to focus at the first distance between the dichroic mirror DM and the viewpoint as the first front image A1. It is imaged.
  • the remaining part of the light that has reached the first beam splitter BS1 is transmitted and travels in the direction of the reflecting portion M, is re-reflected by the reflecting portion M, and re-incidents on the first beam splitter BS1.
  • the light re-entering the first beam splitter BS1 is reflected by the first beam splitter BS1 and further reflected by the dichroic mirror DM to travel in the viewpoint direction.
  • the first beam splitter BS1 and the dichroic mirror DM travels with the optical meridian expanding, the user focuses on the light at a second distance behind the dichroic mirror DM and travels. It is visually recognized as the light that has been coming. Therefore, it can be considered that the first rear image R1 is formed behind the dichroic mirror DM.
  • the light formed as the first front image A1 and the first rear image R1 reaches the user's eyes. Therefore, the user visually recognizes the first front image A1 and the first rear image R1 in the air in the depth direction. Further, even when a transmission plate that transmits light from the background is arranged in the line-of-sight direction from the user's viewpoint, the user is imaged in front of the dichroic mirror DM while visually recognizing the background through the transmission plate. The first front image A1 and the first rear image R1 formed behind the dichroic mirror DM can be visually recognized.
  • the transparent plate include the display surface of another head-mounted display (HMD), the windshield of a vehicle, the shield of a helmet, and the like. Further, an image may be displayed on these transparent plates by using another display device.
  • HMD head-mounted display
  • the windshield of a vehicle the windshield of a vehicle
  • the shield of a helmet and the like.
  • an image may be displayed on these transparent plates by using another display device.
  • FIG. 7 shows an example in which the second beam splitter BS2, the first beam splitter BS1, and the reflection unit M are arranged side by side in the depth direction, but the reflection unit M and the retroreflection unit RR are interchanged.
  • the first front image A1 and the first rear image R1 are imaged at the same positions as those shown in FIG.
  • FIG. 7 shows a configuration in which the light from the first image projection unit S1 is reflected by the second beam splitter BS2 to reach the first beam splitter BS1, but the first image projection unit S1 is reflected by the second beam splitter BS2.
  • the light transmitted through the second beam splitter BS2 may reach the first beam splitter BS1 by arranging them in the depth direction of the above.
  • the second beam splitter BS2 may not be used, and the light may be directly incident on the first beam splitter BS1. Further, another image projection unit may be provided, and light may be incident on the first beam splitter BS1 via the second beam splitter BS2 to further image a plurality of front images and rear images.
  • FIG. 8 is a schematic plan view of the image display device 110.
  • the image display device 110 includes a first image projection unit S1, a first beam splitter BS1, a second beam splitter BS2, a retroreflective unit RR, a reflective unit M, a dichroic mirror DM, and the like. It includes a shutter portion SH, a case portion CS, and a rotation support portion ARM.
  • the dichroic mirror DM is held by the case portion CS with the rotation shaft AX1 as the rotation center
  • the rotation support portion ARM is held with the rotation shaft AX2 as the rotation center. Therefore, the combination of the rotation support portion ARM and the case portion CS includes the rotation shaft AX1 and the rotation shaft AX2, and corresponds to the rotation holding portion in the present disclosure.
  • the shutter unit SH is an optical member that is arranged between the first beam splitter BS1 and the retroreflective unit RR and between the first beam splitter BS1 and the reflective unit M to switch between passing and blocking light.
  • the specific configuration of the shutter unit SH is not limited, and known ones such as an optical isolator, a liquid crystal shutter, and an iris may be used. Further, switching between opening and closing (passing and blocking) of the shutter unit SH is controlled by a control unit (not shown).
  • the case part CS is a housing that houses and holds each part.
  • the first beam splitter BS1, the second beam splitter BS2, the retroreflective section RR, the reflecting section M, and the shutter section SH are housed inside the case section CS. 1
  • the image projection unit S1 and the dichroic mirror DM are externally held by the case unit CS.
  • the rotation support unit ARM is a member that supports the first beam splitter BS1, the retroreflection unit RR, the reflection unit M, and the dichroic mirror DM while maintaining a relative positional relationship, and can rotate around the rotation axis AX2. It is a member provided in. In this embodiment, an example is shown in which the first image projection unit S1 is also held by the rotation support unit ARM.
  • the rotation support part ARM can rotate while maintaining the relative positional relationship of each part, it needs to be made of a material having a certain degree of rigidity.
  • the specific material and shape constituting the rotation support ARM are not limited, but for example, metal, resin, paper, or the like may be used.
  • the path of the light emitted by the first image projection unit S1 is the same as that of the first embodiment, and the first front image A1 is imaged on the side closer to the user than the dichroic mirror DM, and the dichroic mirror DM is used.
  • the first rear image R1 is formed on the far side. At this time, since only the light in the path in which the shutter portion SH is open (transmitted) forms an image, the first front image A1 and the first rear image R1 are selectively imaged by opening and closing the shutter portion SH. Can be done.
  • the shutter unit SH provided between the first beam splitter BS1 and the retroreflective unit RR is in a transmissive state and the shutter unit SH provided between the reflective unit M is in a cutoff state
  • the first beam splitter 1 Only the previous image A1 is imaged.
  • the shutter portion SH provided between the first beam splitter BS1 and the retroreflective portion RR is in a cutoff state and the shutter portion SH provided between the first beam splitter BS1 and the retroreflective portion RR is in a transmissive state
  • the first rear Only image R1 is imaged.
  • the first front image A1 and the first rear image R1 can be selectively imaged by the opening / closing operation of the shutter portion SH, so that the user can perform the first front image. It is possible to switch whether or not to display the image A1 or the first rear image R1. Further, even when a transmission plate that transmits light from the background is arranged in the line-of-sight direction from the user's viewpoint, the first image is formed in front of the dichroic mirror DM while visually recognizing the background through the transmission plate. The front image A1 and the first rear image R1 formed behind the dichroic mirror DM can be visually recognized.
  • one end of the dichroic mirror DM is rotatably held in the case portion CS within a range of an angle ⁇ 1 in the lateral direction about the rotation shaft AX1.
  • the structure for rotatably holding the dichroic mirror DM in the case portion CS is not particularly limited, and for example, even if a structure in which the support shaft provided in the dichroic mirror DM is pivotally supported by the bearing provided in the case portion CS is used. good. Since the dichroic mirror DM rotates about the rotation axis AX1, the incident angle of the light incident on the surface of the dichroic mirror DM from the first beam splitter BS1 changes, so that the first front image A1 and the first rear image The imaging position of R1 also changes.
  • the position where the first image emitted from the first image projection unit S1 is projected into the air can be changed, so that the degree of freedom in the display position of the first front image A1 and the first rear image R1 is improved. It becomes possible to make it.
  • the range of the angle ⁇ 1 is preferably a range of 25 degrees to the left and right (-25 ° ⁇ ⁇ 1 ⁇ 25 °) with respect to the front center direction from the user's viewpoint.
  • the angle ⁇ 1 is larger than ⁇ 25 °, the amount of movement of the line of sight for visually recognizing the aerial image of the first front image A1 and the first rear image R1 becomes large, and the comfort in the superimposed display with the background is maintained. Becomes difficult.
  • FIG. 9 is a schematic perspective view showing a change in the imaging position when the rotation support portion ARM is rotated in the image display device 110.
  • the first image projection unit S1, the first beam splitter BS1, the second beam splitter BS2, the retroreflective unit RR, the reflective unit M, the shutter unit SH, and the case unit CS. Is not shown.
  • the rotation support unit ARM holds at least the dichroic mirror DM included in the projection optical unit with the rotation axis AX2 as the rotation center, and is in the angle range of ⁇ 2 in the left-right direction (side direction). It is rotatable.
  • ⁇ 2 is an angle at which the rotation support portion ARM rotates in the left-right direction (side direction), with the direction in which the user visually recognizes the front in the horizontal direction from the user's viewpoint e position as 0 degree.
  • the direction in which ⁇ 2 is 0 degrees (the direction in which the user visually recognizes the front in the horizontal direction) is referred to as the front center direction.
  • FIG. 9 shows an example in which the rotation support portion ARM is rotated from the front center direction to the right at an angle ⁇ 2, but it also includes a case where the rotation support portion ARM is rotated to the left on the opposite side of FIG.
  • the rotation support portion ARM is rotated around the rotation shaft AX2, so that the first beam splitter BS1, the second beam splitter BS2, the retroreflective portion RR, the reflective portion M, and the dichroic shown in FIG. 7 are rotated.
  • the mirror DM rotates by an angle ⁇ while maintaining a relative positional relationship. Therefore, the imaging positions of the first front image A1 and the first rear image R1 irradiated from the first image projection unit S1 in the air are also positions that fluctuate by an angle ⁇ 2 in the same manner as the rotation of the rotation support unit ARM. As a result, the user visually recognizes the aerial images of the first front image A1 and the first rear image R1 in the direction displaced by an angle ⁇ from the front center direction.
  • the range of the angle ⁇ 2 is preferably a range of 25 degrees to the left and right (-25 ° ⁇ ⁇ 2 ⁇ 25 °) with respect to the front center direction from the user's viewpoint e.
  • the angle ⁇ 2 is larger than ⁇ 25 °, the amount of movement of the line of sight for visually recognizing the aerial image of the first front image A1 and the first rear image R1 becomes large, and the comfort in the superimposed display with the background is maintained. Becomes difficult.
  • the length from the rotation shaft AX2 to the dichroic mirror DM and the length from the viewpoint e to the dichroic mirror DM are about the same. Further, it is preferable that the rotation shaft AX2 and the viewpoint e are at the same position in the depth direction. As a result, the path of the light reflected by the dichroic mirror DM and traveling in the direction of the viewpoint e is displaced at the same degree as the rotation angle ⁇ 2 of the rotation support portion ARM. Therefore, the rotation of the rotation support portion ARM and the displacement of the imaging positions of the first front image A1 and the first rear image R1 are linked, and the imaging positions of the first front image A1 and the first rear image R1 are changed. It can be realized by intuitive operation.
  • the dichroic mirror DM If the dichroic mirror DM is translated, the distance and relative angle of the dichroic mirror DM as seen from the viewpoint e will change. In this case, the path of the light reflected by the dichroic mirror DM is different from that shown in FIG. 7, and the display contents of the first front image A1 and the first rear image R1 are different from those before the change.
  • the movement of the dichroic mirror DM is not a parallel movement in the left-right direction, but a rotational movement around the rotation axis AX2.
  • the relative positional relationship and angle relationship of the projection optical unit for forming the first front image A1 and the first rear image R1 are maintained as shown in FIG. 8, and the first front image A1 and the first rear image R1 and The imaging position of the first rear image R1 is maintained at a distance from the viewpoint e, and the display content of the aerial image can be maintained regardless of the rotation of the rotation support portion ARM.
  • the dichroic mirror DM held by the rotation support portion ARM around the rotation shaft AX2 is rotated by an angle ⁇ 2, and the dichroic mirror is rotated around the rotation shaft AX1.
  • the DM can be rotated by an angle ⁇ 1. Since the rotation holding portion includes a plurality of rotation axes in this way, the positions of the first front image A1 and the first rear image R1 to be imaged in space can be changed, so that the first front image can be further changed. It is possible to improve the degree of freedom of the display position of A1 and the first rear image R1.
  • the display on the HMD and the imaging of the first front image A1 and the first rear image R1 can be performed. Can be done at the same time.
  • the dichroic mirror DM around the rotation shaft AX1 and rotating the rotation support portion ARM around the rotation shaft AX2 the first front image A1 and the first rear image R1
  • the image formation position can be displaced laterally from the display on the HMD.
  • the display on the HMD and the display areas of the first front image A1 and the first rear image R1 can be separated, and it becomes easy to distinguish between them individually.
  • a wavelength filter may be combined with the dichroic mirror DM to cut off unnecessary external light.
  • the wavelength filter is an optical member that cuts ultraviolet light and / or infrared light, and a known film structure may be used.
  • the dichroic mirror DM and the wavelength filter may be formed separately, or both may be combined to form an integral body. Further, the dichroic mirror DM may be configured to reflect ultraviolet light and / or infrared light, and the dichroic mirror DM may also function as a wavelength filter.
  • the ultraviolet light and the infrared light are cut or reflected by the wavelength filter, so that the ultraviolet light and the infrared light reach the viewpoint e. do not.
  • the rotation shaft AX2 is provided at the end of the rotation support ARM.
  • the amount of movement of the case portion CS and the dichroic mirror DM can be made smaller than in the case.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Instrument Panels (AREA)

Abstract

L'invention concerne un dispositif d'affichage d'image (100) qui est pourvu d'une première unité de projection d'image (S) qui projette une première image et d'une unité optique de projection (G) qui projette de la lumière de la première image dans une direction de point de vue. L'objet de l'invention comprend une unité de rotation/rétention (CS) qui retient l'unité optique de projection (G) de manière à pouvoir effectuer une rotation latéralement autour d'un axe de rotation (AX) de sorte que l'angle (θ) formé entre la direction dans laquelle voyage la lumière de la première image projetée à partir de l'unité optique de projection (G) et la direction de ligne de visée centrale à partir du point de vue est variable.
PCT/JP2021/011473 2020-03-27 2021-03-19 Dispositif d'affichage d'image WO2021193461A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202180024880.4A CN115349106A (zh) 2020-03-27 2021-03-19 图像显示装置

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JP2020-059210 2020-03-27
JP2020059210A JP7424888B2 (ja) 2020-03-27 2020-03-27 画像表示装置

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009539129A (ja) * 2006-06-02 2009-11-12 ノキア コーポレイション スプリット射出ひとみ拡大素子
JP2012037761A (ja) * 2010-08-09 2012-02-23 Sony Corp 表示装置組立体
JP2017068045A (ja) * 2015-09-30 2017-04-06 オリンパス株式会社 ウェアラブル装置
US20180024373A1 (en) * 2016-07-25 2018-01-25 Disney Enterprises, Inc. Retroreflector display system for generating floating image effects
JP2018205452A (ja) * 2017-06-01 2018-12-27 セイコーエプソン株式会社 光学装置および表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009539129A (ja) * 2006-06-02 2009-11-12 ノキア コーポレイション スプリット射出ひとみ拡大素子
JP2012037761A (ja) * 2010-08-09 2012-02-23 Sony Corp 表示装置組立体
JP2017068045A (ja) * 2015-09-30 2017-04-06 オリンパス株式会社 ウェアラブル装置
US20180024373A1 (en) * 2016-07-25 2018-01-25 Disney Enterprises, Inc. Retroreflector display system for generating floating image effects
JP2018205452A (ja) * 2017-06-01 2018-12-27 セイコーエプソン株式会社 光学装置および表示装置

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JP7424888B2 (ja) 2024-01-30
JP2021157116A (ja) 2021-10-07

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