WO2023058431A1 - 表示装置 - Google Patents

表示装置 Download PDF

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Publication number
WO2023058431A1
WO2023058431A1 PCT/JP2022/034648 JP2022034648W WO2023058431A1 WO 2023058431 A1 WO2023058431 A1 WO 2023058431A1 JP 2022034648 W JP2022034648 W JP 2022034648W WO 2023058431 A1 WO2023058431 A1 WO 2023058431A1
Authority
WO
WIPO (PCT)
Prior art keywords
user
light
display device
hologram
transparent plate
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/JP2022/034648
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
美木子 中西
幹生 岩村
康夫 森永
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.)
NTT Docomo Inc
Original Assignee
NTT Docomo Inc
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 NTT Docomo Inc filed Critical NTT Docomo Inc
Priority to JP2023552779A priority Critical patent/JP7595185B2/ja
Priority to US18/696,495 priority patent/US20240377641A1/en
Publication of WO2023058431A1 publication Critical patent/WO2023058431A1/ja
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
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted 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
    • G02B27/02—Viewing or reading apparatus
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/32—Holograms used as optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • G02B2027/0174—Head mounted characterised by optical features holographic
    • 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
    • G02B27/017—Head mounted
    • G02B2027/0178—Eyeglass type
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B2207/00—Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
    • G02B2207/123—Optical louvre elements, e.g. for directional light blocking
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H2001/2223—Particular relationship between light source, hologram and observer
    • G03H2001/2228—Particular relationship between light source, hologram and observer adapted for reflection and transmission reconstruction
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2223/00—Optical components
    • G03H2223/12—Amplitude mask, e.g. diaphragm, Louver filter
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/33—Absorbing layer

Definitions

  • the present invention relates to a display device worn on the user's eye.
  • a retinal projection method for projecting image light toward a user's eyes As a display method for a conventional spectacles-type display device, for example, a retinal projection method for projecting image light toward a user's eyes is known.
  • the retinal projection method has problems of a narrow eyebox and a narrow viewing angle.
  • the eyebox is a range in which an image (virtual image) can be visually recognized even when the user wears the glasses-type display device and moves the eyes. Therefore, as an example of a technique for enlarging the eyebox and enlarging the viewing angle, a technique has been proposed in which light replicated by a transmission hologram is reflected by a reflection hologram so as to be focused on the eyebox (see, for example, Patent Document 1).
  • the user recognizes an image by reflecting the light replicated by the transmission hologram so as to converge on the eyebox on the surface of the reflection hologram on the transmission hologram side.
  • light that is not diffracted (reflected) by the surface of the reflection hologram on the transmission hologram side due to reasons such as the reflection hologram having a low diffraction efficiency enters the reflection hologram.
  • Light incident on the reflection hologram is reflected by the surface of the reflection hologram opposite to the transmission hologram due to the difference in refractive index between the reflection hologram and air.
  • the light reflected on the opposite side of the reflection hologram to the transmission hologram propagates through the glass plate between the reflection hologram and the transmission hologram, and is diffracted (reflected) again by the reflection hologram, and is reflected first.
  • the light diffracted (reflected) by the surface of the hologram on the transmission hologram side may enter the user's eyes from a direction different from that of the light. In this way, when a plurality of lights reflected in different directions are reflected to the user's eyes from different directions, there is a problem that the user sees the images in duplicate, that is, image ghosts occur.
  • An embodiment of the present invention has been made in view of the above, and appropriately suppresses overlapping images from appearing when a plurality of lights reflected in different directions are incident on the user's eyes from different directions. It is an object of the present invention to provide a display device capable of
  • a display device is a display device that is worn around the eye of a user, and that when the user wears the display device, one main surface is visible.
  • a transparent plate arranged so as to face the user's eyes, an image light emitting unit for emitting image light relating to an image to be displayed toward one main surface of the transparent plate, and one main surface of the transparent plate and an image light emitting portion, and a transmission hologram that replicates the image light emitted from the image light emitting portion and transmits it as reproduced light, and one main surface faces the other main surface of the transparent plate.
  • a reflection hologram that reflects the reproduced light that has passed through the transparent plate after being transmitted by the transmission hologram toward the eyes of the user, and is provided on the other main surface side of the reflection hologram, an absorption layer combining an absorption member and a transparent member for absorbing a part of the reproduction light that is not reflected on one main surface of the reflection hologram;
  • the absorption layer absorbs part of the reproduced light that has not been reflected on one main surface of the reflection hologram. Therefore, it is possible to prevent the part of the reproduced light from entering the user's eyes.
  • the absorbent layer is a combination of an absorbent member and a transparent member, it is possible to secure the user's field of vision. Therefore, according to the display device according to the embodiment of the present invention, it is possible to prevent the images from appearing overlapped due to a plurality of different reflected lights entering the user's eyes from different directions. .
  • FIG. 4 is a diagram showing directions of reproduced light transmitted from a transmission hologram
  • FIG. 1 schematically shows a display device 1 according to this embodiment.
  • the display device 1 is a display device worn on the user's eyes, and is, for example, a spectacles-type display device as shown in FIG.
  • the display device 1 reflects image light associated with an image (video) to be displayed by a portion corresponding to a lens of spectacles, so that the eye (pupil) of the user wearing the display device 1 (hereinafter also simply referred to as the user) is reflected. project towards.
  • the user perceives the image when the image light is incident on the user's pupil. As will be described later, the image light incident on the user's eyes is also called reproduction light.
  • the display device 1 includes an image light emitting device 10 and a reflecting mechanism 20.
  • the reflection mechanism 20 is a mechanism that reflects image light and projects it onto the user's eyes.
  • the reflecting mechanism 20 is generally plate-shaped like a lens of spectacles, and is provided in a portion corresponding to the lens.
  • the display device 1 may be provided with two reflection mechanisms 20 corresponding to both eyes of the user.
  • the display device 1 includes a frame 50 that holds the reflection mechanism 20 in front of the user's eyes as a mechanism to be worn on the user's eyes, similar to normal spectacles.
  • the frame 50 includes a bridge 51, a pair of temples 52, and the like.
  • the bridge 51 is a member that connects the two reflection mechanisms 20 .
  • Each temple 52 is a member for allowing the user to wear the display device 1, which is hung on the temporal region of the user. Note that the mechanism for attaching the display device 1 to the user's eye is not limited to the one described above, and may have any configuration.
  • the reflection mechanism 20 located in front of the user's eyes transmits light directed toward the user from the outside. Therefore, the user can visually recognize the external space together with the image displayed on the display device 1 . That is, the display device 1 is see-through glasses (smart glasses).
  • the image light emitting device 10 is an image light emitting unit that emits image light related to an image to be displayed.
  • the image light emitting device 10 is arranged so as to emit image light toward the surface of the plate-like reflection mechanism 20, specifically, one main surface of a transparent plate 21 of the reflection mechanism 20, which will be described later.
  • the image light emitting device 10 is fixed to the temple 52 so as to obliquely emit the image light onto the surface of the plate-like reflection mechanism 20 .
  • the display device 1 may be provided with two image light emitting devices 10 respectively corresponding to the two reflecting mechanisms 20 . In this case, for example, two image light emitting devices 10 are provided one each for the left and right temples 52 .
  • the image light emitting device 10 acquires information related to an image to be displayed and emits image light according to the acquired information.
  • the image light emitting device 10 has a communication function, and may acquire information related to an image to be displayed from another device (not shown) connected by wire or wirelessly. Alternatively, the image light emitting device 10 may acquire information related to an image to be displayed that is stored in advance by itself.
  • the image light emitting device 10 includes a light source for generating image light, an optical system for emitting image light, and the like.
  • the image light may be light from an LED (Light Emitting Diode) or laser light.
  • an image light emitting device used for a conventional MEMS (Micro Electro Mechanical Systems) scan display can be used.
  • an image light emitting device used for a flat display such as a conventional LCOS (Liquid crystal on silicon) or DMD (Digital Mirror Device) may be used.
  • the reflection mechanism 20 is a plate-like mechanism configured by stacking a plurality of plate-like members.
  • the reflection mechanism 20 is provided fixed to the frame 50 so that one principal surface of the plate-like shape faces the user's eyes, like a lens of ordinary spectacles.
  • FIG. 2 shows a plurality of plate-like members 21 to 24 of the reflecting mechanism 20. As shown in FIG. FIG. 2 is a side view of the plate-shaped members 21 to 24 that are superimposed. The downward direction in FIG. 2 is the direction toward the eye E of the user.
  • the reflection mechanism 20 includes a transparent plate 21, a transmission hologram 22, a reflection hologram 23, and a louver 24.
  • the respective members 21 to 24 are overlapped in close contact with each other in the order of the transmission hologram 22, the transparent plate 21, the reflection hologram 23 and the louver 24 from the user's eye E.
  • FIG. 2 shows that the respective members 21 to 24 are overlapped in close contact with each other in the order of the transmission hologram 22, the transparent plate 21, the reflection hologram 23 and the louver 24 from the user's eye E.
  • the transparent plate 21 is a member arranged so that one main surface 21a faces the user's eye E when the user wears the display device 1 .
  • the transparent plate 21 is made of glass or plastic, for example.
  • the refractive index of the transparent plate 21 is within a range in which the light can pass through without being reflected at the surfaces in contact with the transmission hologram 22 and the reflection hologram 23 .
  • the transmission hologram 22 is provided between one main surface 21a of the transparent plate 21 and the image light emitting device 10, and is a member that duplicates the image light emitted from the image light emitting device 10 and transmits it as reproduced light. be.
  • the transmission hologram 22 is arranged such that one of its main surfaces is in contact with one main surface 21 a of the transparent plate 21 . It should be noted that the above reproduction light is the reproduction light for the transmission hologram 22 .
  • the image light emitted from the image light emitting device 10 is incident on the transmission hologram 22 from the main surface that is not in contact with one main surface 21 a of the transparent plate 21 .
  • the transmission hologram 22 radially transmits the incident image light from a main surface in contact with one main surface 21a of the transparent plate 21 as a plurality of reproduced light beams.
  • the reproduced light that has passed through the transmission hologram 22 is light that enters the user's eyes and allows them to recognize an image.
  • the directions of the plurality of reconstructed light beams transmitted through the transmission hologram 22 are predetermined by the transmission hologram 22 . This direction is a direction that enables eyebox enlargement and viewing angle enlargement.
  • a conventional transmission hologram can be used as the transmission hologram 22 .
  • the transmission hologram 22 may have a transparent cover made of glass or plastic, for example.
  • a transparent cover is arranged so as to be in contact with one or both of the main surfaces of the transmission hologram 22 .
  • the reflection hologram 23 is provided so that one principal surface faces the other principal surface 21 b of the transparent plate 21 , and on the one principal surface, the reproduced light transmitted by the transmission hologram 22 and passed through the transparent plate 21 is transmitted to the user. It is a member that reflects toward the eye E of the eye.
  • the transmission hologram 22 is arranged such that one of its main surfaces is in contact with the other main surface 21 b of the transparent plate 21 .
  • Reproduced light that has passed through the transmission hologram 22 enters the reflection hologram 23 from the main surface that is in contact with the other main surface 21 b of the transparent plate 21 .
  • the reflection hologram 23 reflects the reproduced light so that the reflected light travels in parallel directions on one principal surface in contact with the transparent plate 21 .
  • the term “propagating in parallel directions” means that the image light of the pixels at the same position in the same image is duplicated by the transmission hologram 22, reflected by the reflection hologram 23, and then directed to the user's eyes in parallel directions. is to proceed to
  • Reflection hologram 23 may have a transparent cover, for example made of glass or plastic. The transparent cover is placed in contact with one or both of the major surfaces of the reflection hologram 23 .
  • FIG. 2 shows the paths of the image lights A and B at the ends of the image light emitted from the image light emitting device 10, and their transmitted light and reflected light (reproduction light).
  • the image light emitting device 10 emits image light A and B toward one main surface 21 a of the transparent plate 21 .
  • the transmission hologram 22 duplicates the image light A emitted from the image light emission device 10 and transmits it as reproduction light A1, A2 and A3.
  • the reflection hologram 23 reflects the reproduction beams A1, A2 and A3 transmitted through the transmission hologram 22 toward the user's eye E.
  • the reflection hologram 23 reflects such that the reflected lights AR1, AR2 and AR3 corresponding to the reproduced lights A1, A2 and A3 travel in directions parallel to each other.
  • the transmission hologram 22 duplicates the image light B emitted from the image light emission device 10 and transmits it as reproduction light B1, B2 and B3.
  • the reflection hologram 23 reflects the reproduction beams B1, B2 and B3 transmitted through the transmission hologram 22 toward the user's eyes. At this time, the reflection hologram 23 reflects such that the reflected beams BR1, BR2 and BR3 corresponding to the reproduced beams B1, B2 and B3 travel in directions parallel to each other.
  • the user can view the image with the reflected light according to the position even at different positions, that is, even when the user moves the position of the eye E. can recognize.
  • eyebox enlargement and viewing angle enlargement can be performed.
  • the transmission hologram 22 may be adjusted so that the degree of aberration of each reproduction light after duplication is the same. Specifically, the transmission hologram 22 adjusts the corresponding reproduction beams A1 and B1 that are transmitted at different positions to be parallel, that is, adjusts the reproduction beams A1 and B1 to be emitted in the same direction. Similarly, the transmission hologram 22 is adjusted so that the reconstruction beams A2 and B2 are parallel, and the reconstruction beams A3 and B3 are adjusted so that they are parallel. As a result, the transmission hologram 22 can be adjusted so that the reproduced light beams A1, A2 and A3 that are reproduced from the image light beam A and transmitted therethrough have the same degree of aberration. Similarly, the transmission hologram 22 is replicated from the image beam B and can be adjusted so that the transmitted reconstruction beams B1, B2 and B3 have the same degree of aberration.
  • FIG. 2 shows, as an example of the reproduced light incident on the reflection hologram 23, the reproduced light AT3 incident on the reflection hologram 23, which is a part of the reproduced light A3.
  • the reproduction light AT3 is totally reflected at the interface between the other main surface of the reflection hologram 23 that is not in contact with the transparent plate 21 and the air, and returns to the transparent plate 21 .
  • the reproduction light AT3 that has returned to the transparent plate 21 propagates through the transparent plate 21 while being reflected.
  • the propagating reproduction light AT3 again reaches one main surface of the reflection hologram 23 in contact with the transparent plate 21 .
  • the reproduction light AT3 that has reached the reflection hologram 23 is reflected by one of the main surfaces in contact with the transparent plate 21 and travels toward the eye E of the user.
  • the reproduction light of another image light is reflected and travels toward the eye E of the user. If a plurality of reproduction beams are reflected at the same position, the user will see overlapping images.
  • the louver 24 is for suppressing a portion of the reproduced light that has not been reflected by one of the main surfaces of the reflection hologram 23 in contact with the transparent plate 21 from entering the eye E of the user. As a result, it is possible to prevent the user from seeing overlapping images, that is, the generation of ghosts.
  • the louver 24 is provided on the other main surface side of the reflection hologram 23, and is an absorption layer that combines an absorption member and a transparent member that absorb a part of the reproduced light that is not reflected on the one main surface of the reflection hologram 23. It is a member that is The louver 24 may be a combination of absorbing members and transparent members alternately striped. The length of the transparent member in the direction perpendicular to the fringes in the louver 24 may be a length capable of preventing diffraction of light incident on the louver from the side opposite to the other principal surface of the reflection hologram.
  • the ratio of the thickness of the louver 24 to the length of the transparent member in the direction perpendicular to the fringes is such that a part of the reproduction light can be absorbed and the reflection hologram 23 can be absorbed from the opposite side of the main surface of the reflection hologram 23. It may be a ratio that can prevent diffraction of light incident on the louver 24 .
  • FIG. 3 shows an oblique view of the louver 24.
  • the louver 24 is a member combining an absorbing member 24a and a transparent member 24b.
  • the thickness (length) T of the louver 24 is, for example, 50 ⁇ m.
  • the absorption member 24a is a member that absorbs a part of the reproduced light (visible light) that is not reflected on one main surface of the reflection hologram 23.
  • the absorbing member 24a is made of, for example, black silicone rubber.
  • the transparent member 24b is made of glass or plastic, for example.
  • the louver 24 is constructed by combining a plurality of elongated absorbing members 24a and transparent members 24b alternately in stripes.
  • the louver 24 can be produced by stacking and bonding a plurality of plate-like absorbing members 24a and transparent members 24b, and cutting them into plate-like shapes in the stacking direction.
  • the refractive indices of the absorbing member 24a and the transparent member 24b are within a range in which the light can pass through without being reflected at the surface in contact with the reflection hologram 23.
  • FIG. the refractive index of the transparent member 24b and the refractive index of the reflection hologram 23 are close values.
  • the refractive index of the transparent member 24b may be set to a value larger than the refractive index of the reflection hologram 23.
  • the refractive index of the transparent member 24b is smaller than the refractive index of the reflection hologram 23 the refractive index is set such that the boundary between the transparent member 24b and the reflection hologram 23 does not cause reflection of light.
  • the louver 24 is provided with the transparent member 24b, the reflecting mechanism 20 can transmit light directed toward the user from the outside as described above.
  • the combination of the absorbing member 24a and the transparent member 24b in the louver 24 does not necessarily have to be as described above, provided that part of the reproduction light can be absorbed and light directed toward the user from the outside can be transmitted. It does not have to be striped.
  • the pitch P which is the length of each transparent member 24b in the direction perpendicular to the fringes, is narrow, light incident on the louver 24 from the outside (incident on the louver 24 from the side opposite to the other main surface of the reflection hologram 23) light) diffraction occurs.
  • the pitch P may be of a length capable of preventing diffraction of light from the outside.
  • the pitch P is set to 400 ⁇ m or more. This length is such that the user does not see the diffracted light from the outside when the louver 24 is placed 1.5 cm from the eye E of the user.
  • the ratio between the thickness T of the louver 24 and the pitch P described above may be a ratio that can absorb part of the reproduction light and prevent diffraction of light entering the louver 24 from the outside.
  • the ratio of height T to pitch P may be 4:3. Note that the transparent plate 21 is omitted in FIG.
  • the number of directions of the reproduced light transmitted from the transmission hologram 22 is twenty.
  • the table in FIG. 4 shows the directions.
  • the direction in which the elevation angle ⁇ is 34.826° has the azimuth angles ⁇ of 18.435°, 71.565°, 108.435°, 161.565°, 198.435°, 251.565°, and 288.435°. and 341.565°.
  • the elevation angle ⁇ is 20.672° and the four azimuth angles ⁇ shown in FIG.
  • the azimuth angle ⁇ indicates a direction based on a preset direction on the main surface of the transmission hologram 22
  • the elevation angle ⁇ indicates an angle from the transmission hologram 22 to the reflection hologram 23 with the main surface of the transmission hologram 22 as a reference. , that is, the angle (within the critical angle) of the reproduced light propagating through the transparent plate 21 .
  • the reproduction light may be transmitted in directions other than those described above.
  • the louver 24 may be provided so that the absorbing member 24a and the transparent member 24b form horizontal stripes when viewed from the user when the display device 1 is worn by the user. That is, the direction of each vertically long absorbing member 24a and the transparent member 24b may be substantially the same as the direction connecting the user's eyes. Since the absorbing member 24a is a colored member, it may interfere with the user's view of the outside. By arranging the absorbing member 24a and the transparent member 24b as described above, it is possible to prevent the absorbing member 24a from interfering with the user's view in the left-right direction (horizontal direction). As a result, it is possible to widen the field of view of the user in the horizontal direction.
  • the above is the configuration of the display device 1 .
  • part of the reproduced light that is not reflected by one main surface of the reflection hologram 23 is absorbed by the louver 24 . Therefore, it is possible to prevent the part of the reproduced light from entering the user's eyes.
  • the louver 24 is a combination of the absorbing member 24a and the transparent member 24b, the user can see the scenery outside as described above. That is, it is possible to secure the user's field of view. Therefore, according to the present embodiment, it is possible to prevent overlapping images from appearing due to a plurality of different reflected lights entering the user's eyes from different directions.
  • the external scenery seen by the user may be colored by the absorbing member, or the user may not be able to see the external form in the first place. That is, the user's field of view cannot be ensured accurately. In this embodiment, visibility can be ensured without causing the above problems.
  • the louver 24 may be a combination of the absorbing members 24a and the transparent members 24b alternately arranged in stripes. With this configuration, the louver 24 can be configured easily and reliably, and the display device 1 according to the present embodiment can be easily and reliably realized.
  • the pitch P of the above-described transparent member 24b in the louver 24 may be a length that can prevent diffraction of light incident on the louver 24 from the outside. According to this configuration, it is possible to prevent the outside scenery from blurring as described above.
  • the ratio of the thickness T of the louver 24 to the pitch P of the transparent member 24b in the louver 24 is such that a part of the reproduction light can be absorbed and the louver 24 is arranged from the opposite side of the reflection hologram 23 from the other main surface. It may be a ratio that can prevent diffraction of light incident on . According to this configuration, it is possible to appropriately prevent the images from appearing overlapping and to prevent the outside scenery from blurring.
  • the louver 24 may be provided so that the absorbing member 24a and the transparent member 24b form horizontal stripes when viewed from the user when the display device 1 is worn by the user. According to this configuration, it is possible to widen the field of view of the user in the horizontal direction.
  • the louver 24 does not necessarily have to have the above-described configurations, and may be a combination of an absorbing member and a transparent member.
  • connection means any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being “connected” or “coupled.” Couplings or connections between elements may be physical, logical, or a combination thereof. For example, “connection” may be read as "access”.
  • two elements are defined using at least one of one or more wires, cables, and printed electrical connections and, as some non-limiting and non-exhaustive examples, in the radio frequency domain. , electromagnetic energy having wavelengths in the microwave and optical (both visible and invisible) regions, and the like.
  • any reference to elements using the "first,” “second,” etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and second element does not imply that only two elements can be employed or that the first element must precede the second element in any way.
  • a and B are different may mean “A and B are different from each other.”
  • the term may also mean that "A and B are different from C”.
  • Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Holo Graphy (AREA)
PCT/JP2022/034648 2021-10-06 2022-09-15 表示装置 Ceased WO2023058431A1 (ja)

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Application Number Priority Date Filing Date Title
JP2023552779A JP7595185B2 (ja) 2021-10-06 2022-09-15 表示装置
US18/696,495 US20240377641A1 (en) 2021-10-06 2022-09-15 Display device

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JP2021164729 2021-10-06
JP2021-164729 2021-10-06

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Citations (4)

* Cited by examiner, † Cited by third party
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JP2005331767A (ja) * 2004-05-20 2005-12-02 Sony Corp 画像表示装置
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