WO2022019048A1 - Appareil de génération d'image et affichage tête haute - Google Patents

Appareil de génération d'image et affichage tête haute Download PDF

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Publication number
WO2022019048A1
WO2022019048A1 PCT/JP2021/024175 JP2021024175W WO2022019048A1 WO 2022019048 A1 WO2022019048 A1 WO 2022019048A1 JP 2021024175 W JP2021024175 W JP 2021024175W WO 2022019048 A1 WO2022019048 A1 WO 2022019048A1
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WO
WIPO (PCT)
Prior art keywords
light
region
image
light source
liquid crystal
Prior art date
Application number
PCT/JP2021/024175
Other languages
English (en)
Japanese (ja)
Inventor
典子 佐藤
匡紘 堀
遥介 中山
幸平 望月
Original Assignee
株式会社小糸製作所
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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 JP2022538656A priority Critical patent/JPWO2022019048A1/ja
Publication of WO2022019048A1 publication Critical patent/WO2022019048A1/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—Arrangement of adaptations of instruments
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • 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 generator and a head-up display provided with the image generator.
  • Patent Document 1 discloses a head-up display in which an image luminous flux emitted by an image forming unit is reflected on a windshield by a reflecting mirror to display a virtual image to an occupant.
  • the image forming unit the light transmitted through the liquid crystal display device is emitted from the image forming unit as an image luminous flux.
  • a predetermined virtual image is displayed in the area where the virtual image can be displayed.
  • the light leaked from the liquid crystal display device may be visually recognized as if the area other than the virtual image in the virtual image displayable area shines faintly.
  • the brightness of the virtual image displayable area becomes higher than the ambient brightness, and the outline of the virtual image displayable area becomes conspicuous, which gives a sense of discomfort to the occupants of the vehicle and distracts the occupants' attention. There was a fear.
  • the image generator is an image generator that generates an image of a head-up display.
  • Light source and A liquid crystal device having a rectangular display area and forming light so as to generate the image by the light emitted from the light source.
  • An optical member for dimming light corresponding to at least one side of the display region is provided.
  • the image generator of the present disclosure since the optical member corresponding to at least one side of the display area is provided, the outline of the display area becomes inconspicuous in the dimmed portion. Therefore, it is possible to suppress giving a sense of discomfort to the occupants of the vehicle.
  • the image generator is An image generator that generates multiple images for a head-up display.
  • With the first light source With the second light source Information different from the information shown by the first image due to the light emitted from the second light source and the first region forming the light for generating the first image by the light emitted from the first light source.
  • a liquid crystal device having a second region forming light to generate a second image for showing, and a liquid crystal device.
  • a first optical element that irradiates the first region of the liquid crystal device with light emitted from the first light source, and a second optical beam that irradiates the second region of the liquid crystal device with light emitted from the second light source. It is equipped with an element.
  • an optical system (light source and optical element) is provided corresponding to an image showing information (content) displayed by the head-up display. Therefore, it is possible to prevent the light from reaching a portion of the liquid crystal device other than the region forming the image to be displayed. As a result, it is possible to suppress the area other than the virtual image to be displayed from shining faintly in the virtual image displayable area displayed by the head-up display, and it is possible to make the outline of the virtual image displayable area inconspicuous.
  • the head-up display of the present disclosure is A head-up display provided on a vehicle and configured to display a plurality of images toward the occupants of the vehicle.
  • At least one reflecting unit that reflects the light emitted by the image generator, and It includes a control unit that individually controls the emission timing of the first light source and the second light source.
  • an optical system (light source and optical element) is provided according to an image showing information (content) displayed by the head-up display. Therefore, it is possible to prevent the light from reaching a portion of the liquid crystal device other than the region forming the image to be displayed. As a result, it is possible to suppress the area other than the virtual image to be displayed from shining faintly in the virtual image displayable area displayed by the head-up display, and it is possible to make the outline of the virtual image displayable area inconspicuous.
  • an image generation device capable of making the outline of a virtual image displayable area inconspicuous, and a head-up display provided with the image generation device.
  • FIG. 1 is a schematic diagram showing the configuration of the head-up display (HUD) of the present disclosure.
  • FIG. 2 is an image generation device for the head-up display shown in FIG. 1, and is a schematic cross-sectional view in the left-right direction of the image generation device according to the first embodiment.
  • FIG. 3 is a perspective view of the liquid crystal device of the image generator.
  • FIG. 4 is a diagram showing an example of a visual field area of a vehicle occupant.
  • FIG. 5 is a plan view of the optical member of the image generator.
  • FIG. 6 is a plan view of a modification 1 of the optical member of the image generator.
  • FIG. 7 is a plan view of a modification 2 of the optical member of the image generator.
  • FIG. 8 is a schematic cross-sectional view in the left-right direction of the image generator according to the second embodiment.
  • FIG. 9 is a plan view of the optical member of the image generator shown in FIG.
  • FIG. 10 is a schematic cross-sectional view in the left-right direction of a modified example of the image generator.
  • FIG. 11 is a plan view of the second optical member of the image generator shown in FIG.
  • FIG. 12 is a perspective view of a modified example of the liquid crystal device.
  • FIG. 13 is a schematic cross-sectional view showing the configuration of the image generator according to the third embodiment.
  • FIG. 14 is a plan view of the light source substrate of FIG.
  • FIG. 15 is a plan view of the liquid crystal device of FIG.
  • FIG. 16 is a diagram showing an example of a visual field area of a vehicle occupant.
  • FIG. 17 is a schematic cross-sectional view showing the configuration of the image generator according to the fourth embodiment.
  • horizontal direction In the description of the present embodiment, for convenience of explanation, "horizontal direction”, “vertical direction”, and “front-back direction” may be appropriately referred to. These directions are relative directions set for the HUD (Head-Up Display) 20 shown in FIG.
  • the "left-right direction” is a direction including the “left direction” and the “right direction”.
  • the "vertical direction” is a direction including “upward” and “downward”.
  • the "front-back direction” is a direction including the "forward direction” and the "backward direction”.
  • the left-right direction is a direction orthogonal to the up-down direction and the front-back direction.
  • FIG. 1 is a schematic view of the HUD 20 as viewed from the side surface side of the vehicle 1.
  • the HUD 20 has at least a part of the HUD 20 located inside the vehicle 1.
  • the HUD 20 is installed at a predetermined position in the room of the vehicle 1.
  • the HUD 20 may be located within the dashboard of vehicle 1.
  • the HUD 20 is configured to display the information as an image toward the occupants of the vehicle 1 so that the predetermined information is superimposed on the real space outside the vehicle 1 (particularly, the surrounding environment in front of the vehicle 1). ing.
  • the information displayed by the HUD 20 is, for example, vehicle traveling information related to the traveling of the vehicle 1 and / or peripheral environment information related to the surrounding environment of the vehicle 1 (particularly, information related to an object existing outside the vehicle 1). ) Etc.
  • the HUD 20 is an AR display that functions as a visual interface between the vehicle 1 and the occupants.
  • the HUD 20 includes a HUD main body 21.
  • the HUD main body 21 has a main body housing 22 and an exit window 23.
  • the emission window 23 is made of a transparent plate that allows visible light to pass through.
  • the HUD main body 21 has an image generator (PGU) 24, a control unit 25, a concave mirror 26 (an example of a reflection unit), and a plane mirror 28 inside the main body housing 22.
  • PGU image generator
  • control unit 25 an example of a reflection unit
  • a plane mirror 28 inside the main body housing 22.
  • the image generation device 24 is configured to emit light for generating at least one image displayed by the HUD 20 toward the occupant of the vehicle 1.
  • the image is a 2D image or a 3D image for displaying predetermined information (content).
  • the image generation device 24 can emit light for generating a change image that changes depending on the situation of the vehicle 1, for example.
  • the image generation device 24 is installed in the main body housing 22 so as to emit light upward.
  • the control unit 25 controls the operation of each unit of the HUD 20.
  • the control unit 25 is connected to the vehicle control unit (not shown) of the vehicle 1, and operates the image generation device 24 based on, for example, vehicle travel information and surrounding environment information transmitted from the vehicle control unit.
  • a control signal for control is generated, and the generated control signal is transmitted to the image generator 24.
  • the control unit 25 is equipped with a processor such as a CPU (Central Processing Unit) and a memory, and the processor executes a computer program read from the memory to control the operation of the image generator 24 and the like.
  • a processor such as a CPU (Central Processing Unit) and a memory
  • the plane mirror 28 is arranged on the optical path of the light emitted from the image generation device 24. Specifically, the plane mirror 28 is arranged above the image generation device 24, and is configured to reflect the light emitted from the image generation device 24 toward the concave mirror 26.
  • the concave mirror 26 is arranged on the optical path of the light emitted from the image generator 24 and reflected by the plane mirror 28. Specifically, the concave mirror 26 is arranged in the main body housing 22 on the front side of the image generator 24 and the plane mirror 28. The concave mirror 26 is configured to reflect the light emitted from the image generator 24 toward the windshield 18 (for example, the front window of the vehicle 1).
  • the concave mirror 26 has a reflecting surface curved in a concave shape in order to form a predetermined image, and reflects an image of light emitted from the image generation device 24 and formed at a predetermined magnification.
  • the concave mirror 26 may have, for example, a drive mechanism 27, and may be configured to be able to change the position and orientation of the concave mirror 26 based on a control signal transmitted from the control unit 25.
  • the light emitted from the image generator 24 is reflected by the plane mirror 28 and the concave mirror 26 and emitted from the exit window 23 of the HUD main body 21.
  • the light emitted from the exit window 23 of the HUD main body 21 irradiates the windshield 18.
  • a part of the light emitted from the exit window 23 to the windshield 18 is reflected toward the occupant's viewpoint E.
  • the occupant recognizes the light emitted from the HUD main body 21 as a virtual image (predetermined image) formed at a predetermined distance in front of the windshield 18.
  • the occupant can see the virtual image object I formed by the predetermined image on the road located outside the vehicle. It can be visually recognized as if it were floating.
  • the occupant's viewpoint E may be either the occupant's left eye viewpoint or the right eye viewpoint.
  • the viewpoint E may be defined as the midpoint of a line segment connecting the viewpoint of the left eye and the viewpoint of the right eye.
  • the position of the occupant's viewpoint E can be specified, for example, based on image data acquired by a camera arranged inside the vehicle 1.
  • the position of the viewpoint E of the occupant may be updated at a predetermined cycle, or may be determined only once when the vehicle 1 is started.
  • a predetermined image is projected so as to be a virtual image of a single distance arbitrarily determined.
  • a 3D image stereo image
  • a plurality of predetermined images that are the same as or different from each other are projected so as to be virtual images at different distances.
  • the distance of the virtual image object I (distance from the viewpoint E of the occupant to the virtual image) adjusts the distance from the image generation device 24 to the viewpoint E of the occupant (for example, the distance between the image generation device 24 and the concave mirror 26). It can be adjusted as appropriate by adjusting).
  • the configuration in which the light emitted from the image generator 24 is reflected twice by the plane mirror 28 and the concave mirror 26 has been described, but there is no plane mirror 28 and only the concave mirror 26 is arranged and the light is reflected once. It may be configured as such.
  • FIG. 2 is a schematic cross-sectional view in the left-right direction showing the configuration of the image generation device 24A.
  • the image generator 24A includes a light source 111, a lens 120 (optical element), a liquid crystal device 130, and a diffusion sheet 140A (optical member).
  • the lens 120 is arranged above the light source 111.
  • the liquid crystal device 130 is arranged above the lens 120.
  • the diffusion sheet 140A is arranged between the lens 120 and the liquid crystal device 130.
  • the light source 111 is, for example, a laser light source or an LED light source.
  • the laser light source is, for example, an RGB laser light source configured to emit a red laser light, a green light laser light, and a blue laser light, respectively.
  • the LED light source is, for example, a white LED light source.
  • the light source 111 is mounted on the light source substrate 110.
  • the light source 111 includes a first light source 111A and a second light source 111B.
  • the first light source 111A and the second light source 111B are arranged on the light source substrate 110 at a distance of a certain distance in the left-right direction.
  • the light source substrate 110 is, for example, a printed circuit board on which wiring of an electric circuit is printed on the surface or inside of a base substrate made of an insulator.
  • the light source substrate 110 is electrically connected to the control unit 25.
  • the lens 120 is, for example, an aspherical convex lens in which both the incident surface 122 on which the light from the light source 111 is incident and the exit surface 123 on which the incident light is emitted are formed in a convex shape.
  • the lens 120 is configured to transmit the light emitted from the light source 111 and emit it toward the liquid crystal device 130.
  • the lens 120 has a first region 121A that transmits the first light emitted from the first light source 111A and a second region 121B that transmits the second light emitted from the second light source 111B. is doing.
  • the first region 121A is an aspherical convex lens corresponding to the first light source 111A.
  • the second region 121B is an aspherical convex lens corresponding to the second light source 111B.
  • the incident surface 122A of the first region 121A and the incident surface 122B of the second region 121B are convex incident surfaces slightly bulging downward.
  • the exit surface 123A of the first region 121A and the exit surface 123B of the second region 121B are convex exit surfaces that bulge upward.
  • the right part of the first region 121A arranged on the left side and the left part of the second region 121B arranged on the right side are combined.
  • the lens 120 has, for example, a lens holder (FIG. 2) so that the center of the light emitting surface of the first light source 111A is the focal position of the first region 121A and the center of the light emitting surface of the second light source 111B is the focal position of the second region 121B. Not shown).
  • the diffusion sheet 140A is, for example, a resin thin film sheet containing an OHP sheet.
  • the diffusion sheet 140A is arranged between the lens 120 and the liquid crystal device 130 so as to face the liquid crystal device 130.
  • the diffusion sheet 140A is configured to dim a part of the light emitted from the lens 120.
  • the other part of the light emitted from the lens 120 passes through the diffusion sheet 140A.
  • the light that has passed through the diffusion sheet 140A travels to the liquid crystal device 130. Further details of the diffusion sheet 140A will be described later with reference to FIG.
  • the liquid crystal device 130 forms light for generating a predetermined image by the light passing through the diffusion sheet 140A.
  • the liquid crystal device 130 is attached to the upper surface of the PGU housing (not shown), for example, with the light emitting surface for emitting light for generating an image facing upward of the image generating device 24A.
  • the liquid crystal device 130 has, for example, a liquid crystal panel 131 and a drive circuit (not shown). Each of the pixels constituting the liquid crystal panel 131 is controlled by a drive circuit so that the light transmitted through the lens 120 is transmitted and the light is not transmitted. By controlling the transmission and blocking of light for each pixel, light for generating a predetermined image is formed.
  • FIG. 3 is a perspective view of the liquid crystal panel 131 of the liquid crystal device 130.
  • the liquid crystal panel has a rectangular image-formable region (image-formable region, display region) A.
  • image-formable region A the long side of one (front side in FIG. 3) is side A1, the long side of the other (rear side in FIG. 3) is side A2, and the short side of one (left side in FIG. 3).
  • A4 be the short side of the side A3 and the other (right side in FIG. 3).
  • the outer circumference of the image-formable region A includes two long sides A1 and A2 and two short sides A3 and A4.
  • FIG. 4 is a diagram showing an example of the visual field area V of the occupant in a state where the virtual image object I1 is displayed so as to be superimposed on the real space outside the vehicle 1 by the HUD 20.
  • the field of view region V shown in FIG. 4 includes a part of the vehicle 1 (bonnet or the like).
  • a virtual image object I1 showing vehicle speed information is displayed as an example of display.
  • the liquid crystal device 130 controls light transmission and blocking for each pixel constituting the liquid crystal panel 131 so that the virtual image object I1 is displayed at a predetermined position in the virtual image displayable area R, and an image showing vehicle speed information. Form the light to produce.
  • the square frame shown by the broken line indicates the position of the virtual image displayable area R for convenience, and the frame does not actually exist.
  • the virtual image displayable region R corresponds to the image formable region A shown in FIGS. 2 and 3 in the liquid crystal device 130.
  • the image formable region A in the liquid crystal device 130 is a region in which the pixels constituting the liquid crystal panel 131 are formed, and the virtual image displayable region R corresponds to the shape of the liquid crystal panel 131.
  • FIG. 5 shows a plan view of the diffusion sheet 140A.
  • the diffusion sheet 140A has a rectangular shape corresponding to the rectangular image-forming region A.
  • the long side of one front side in FIG. 5
  • the long side of the other rear side in FIG. 5
  • the short side of one left side in FIG. 5
  • the other short side is 144.
  • the corner portion formed by the side 141 and the side 143 is the corner 145
  • the corner portion formed by the side 141 and the side 144 is the corner 146
  • the corner portion formed by the side 142 and the side 143 is the corner 147 and the side 142.
  • Let 148 be the corner portion formed by the side 144 and the side 144.
  • the side 141 of the diffusion sheet 140A corresponds to the side A1 of the image formable region A of the liquid crystal panel 131.
  • the side 142 of the diffusion sheet 140A corresponds to the side A2 of the image-formable region A of the liquid crystal panel 131.
  • the side 143 of the diffusion sheet 140A corresponds to the side A3 of the image-formable region A of the liquid crystal panel 131.
  • the side 144 of the diffusion sheet 140A corresponds to the side A4 of the image-formable region A of the liquid crystal panel 131.
  • the shape of the diffusion sheet 140A may correspond to the shape of the image-formable region A, and is not limited to the rectangular shape.
  • the shape of the diffusion sheet 140A may be, for example, an elliptical shape.
  • the diffusion sheet 140A includes a side 141, two corners 145 and a corner 146, a region P1 that dims a part of the light from the lens 120, and a center of the diffusion sheet 140A, and diffuses the light from the lens 120. It has a region Q1 that allows the light to pass through without causing the light to pass through.
  • the dimming rate of light in the region P1 is higher than the dimming rate of light in the region Q1.
  • the light diffusivity in the region P1 is larger than the light diffusivity in the region Q1.
  • the light diffusivity of the region P1 is 50%, and the light diffusivity of the region Q1 is less than 5%.
  • the size of the region Q1 is a size capable of transmitting the entire light forming the virtual image object I1.
  • the region P1 of the diffusion sheet 140A fine irregularities are formed on at least one surface of the resin thin film sheet which is the base layer.
  • the unevenness may be formed on both sides of the resin thin film sheet.
  • the light diffusivity in the region P1 is determined based on the shape and density of the unevenness and the height from the resin thin film sheet. Due to this unevenness, a part of the light emitted from the lens 120 is diffused in all directions as it passes through the region P1. Since a part of the light passing through the region P1 is diffused in a direction other than the liquid crystal device 130, the light reaching the liquid crystal device 130 is reduced, and as a result, the light incident on the liquid crystal device 130 is dimmed. In this example, since the region P1 is a region including the side 141 and the corners 145 and 146, the light corresponding to the side A1 of the corresponding image-formable region A is dimmed.
  • a general image generator Z not provided with the diffusion sheet 140A will be described.
  • a liquid crystal device forms light for forming a predetermined image by controlling transmission and blocking of light transmitted through a lens for each pixel constituting the liquid crystal panel.
  • a region other than the virtual image object I1 may be visually recognized as faintly shining in the virtual image displayable region R shown in FIG.
  • the image generation device Z the outer peripheral portion of the image forming region of the liquid crystal device is also irradiated with light in the same manner as the other portions, so that the contour of the virtual image displayable region R may be conspicuous.
  • the light transmitted through the lens reaches the contour of the image-formable region A of the liquid crystal panel without being diffused, so that the light is inside the contour of the virtual image displayable region R.
  • the contour of the virtual image displayable region R becomes conspicuous due to a difference between the brightness and the brightness outside the contour.
  • the diffusion sheet 140A diffuses and dims the light that has passed through the region P1 of the diffusion sheet 140A among the light transmitted through the lens 120. Since the region P1 is located at a position corresponding to the side A1 constituting the contour of the image formable region A of the liquid crystal panel 131, the light forming the side A1 is dimmed, and as a result, the virtual image displayable region corresponding to the side A1 is displayed. The light on one side of R is also dimmed. Therefore, there is little difference between the brightness inside the contour of the virtual image displayable region R and the brightness outside the contour, and the contour of the virtual image displayable region R is not conspicuous.
  • the image generation device 24A of this example includes the diffusion sheet 140A that dims a part of the light corresponding to one side A1 of the image formable region A, the light forming the side A1 of the image formable region A is provided. Part of is dimmed. By dimming a part of the light forming the side A1, the difference in brightness between the inside of one side of the virtual image displayable area R corresponding to the side A1 and the outside of the side is reduced, and the virtual image displayable area is reduced. The outline of one side of R becomes inconspicuous.
  • the region P1 of the diffusion sheet 140A of this example includes not only the sides 141 but also the corners 145 and 146.
  • the contours of the two corners of the virtual image displayable region R corresponding to these two corners 145 and 146 are also inconspicuous. Therefore, it is possible to suppress giving a sense of discomfort to the occupant of the vehicle 1 who visually recognizes the virtual image object I1.
  • the dimming rate of the light corresponding to the side A1 of the image-formable region A that is, the dimming rate of the light of the region P1 is the dimming of the light of the region Q1 including the center of the diffusion sheet 140A. Higher than the rate. More specifically, the light diffusivity of the region P1 is higher than the light diffusivity of the region Q1. Therefore, the diffusion sheet 140A of this example can make the outline of one side of the virtual image displayable region R inconspicuous while ensuring the amount of light without diffusing the light forming the virtual image object I1 in the region Q1.
  • the region P1 of the diffusion sheet 140A is a region including the side 141 and the corners 145 and 146, but the position of the region P1 is not limited to the location.
  • the region P1 may be arranged at a position where the light forming the virtual image object I1 is not dimmed.
  • FIG. 6 shows a plan view of the diffusion sheet 140B as a modification 1.
  • the same or corresponding components as the diffusion sheet 140A according to FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted.
  • the region P1'of the diffusion sheet 140B is a region including all four sides 141, 142, 143, 144 and four corners 145, 146, 147, 148, and forms the virtual image object I1. It is placed in a position that does not dimm the light.
  • the light diffusivity in the region P1' is larger than the light diffusivity in the region Q1, for example, 50%.
  • the region P1' is arranged at a position corresponding to the entire outer circumference of the image-formable region A, and the diffusion sheet 140B is configured to dimm the light corresponding to the entire outer circumference of the image-formable region A.
  • the diffusion sheet 140B dims the light corresponding to the entire outer periphery of the image formable region A, a part of the light forming the contour of the image formable region A is dimmed. By dimming a part of the light forming the contour of the image-formable region A, the contour of the corresponding virtual image displayable region R becomes inconspicuous.
  • the region P1'of the diffusion sheet 140B of this example includes not only the four sides 141 to 144 but also the four corners 145 to 148.
  • the contours of the four corners of the virtual image displayable region R corresponding to these four corners are also inconspicuous. Therefore, it is possible to suppress giving a sense of discomfort to the occupant of the vehicle 1 who visually recognizes the virtual image object I1.
  • the region P1'and the region Q1 are arranged on one resin thin film sheet, but the form of the diffusion sheet 140B is not limited to this.
  • the form of the diffusion sheet 140B may be a donut-shaped sheet composed of only the region P1'.
  • the portion of the region Q1 is hollowed out from the resin thin film sheet and is a space. Also in this case, since the light diffusivity in the region P1'is larger than the light diffusivity in the portion (space) of the region Q1, the same effect as described above can be obtained.
  • FIG. 7 shows a plan view of the diffusion sheet 140C as a modification 2.
  • the same or corresponding components as the diffusion sheet 140A according to FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted.
  • the diffusion sheet 140C has a region P2, a region P3, and a region P4.
  • Region P2 is arranged to include all four sides 141, 142, 143, 144 and four corners 145, 146, 147, 148.
  • the region P4 is inside the region P2 and is arranged so as to surround the region Q1.
  • the region P3 is arranged between the regions P2 and the region P4.
  • Each region is arranged at a position where the light forming the virtual image object I1 is not dimmed. In this example, each region is arranged at a position corresponding to the outer periphery of the image-formable region A, but may be arranged at a position corresponding to only one side of the image-formable region A.
  • the light diffusivity of the region P4 is higher than the light diffusivity of the region Q1, for example, 10%.
  • the light diffusivity of the region P3 is higher than the light diffusivity of the region P4, for example, 20%.
  • the light diffusivity of the region P2 is higher than the light diffusivity of the region P3, for example, 50%.
  • the light diffusivity of the diffusing sheet 140C gradually decreases from the region P2 located on the outer periphery of the diffusing sheet 140C toward the region Q1 located in the center.
  • the density of fine irregularities is low in the region P4, the density of fine irregularities is high in the region P2, the density of the fine irregularities in the region P3 is lower than the density of the irregularities in the region P2, and the density of the irregularities in the region P4. It is higher than the density of.
  • the diffusion rate of the light of the diffusion sheet 140C gradually decreases from the outer periphery of the diffusion sheet toward the center, so that the light forming the contour of the image-formable region A extends from the center to the outer periphery. Gradually more diffused. Since the amount of light forming the contour of the image-formable region A decreases from the center to the outer periphery, the brightness in the virtual image displayable region R also gradually changes from the center to the outer periphery, and the virtual image can be displayed. The outline of the area R is inconspicuous. Therefore, it is possible to suppress giving a sense of discomfort to the occupant of the vehicle 1 who visually recognizes the virtual image object I1.
  • the diffusion sheets 140A, 140B and 140C have been described as optical members that dimming a part of the light corresponding to one side A1 of the image-formable region A, the optical members are not limited to the diffusion sheet.
  • the optical member that dims a part of the light may be a transmission sheet 150A.
  • the transmission sheet 150A will be described with reference to FIGS. 2 to 7.
  • the structure of the transmissive sheet 150A is the diffusion sheet 140A in terms of the arrangement position (between the lens 120 and the liquid crystal device 130), the shape (rectangular shape), and the form (regions Q1, P1, P1', P2, P3, P4). Since it has the same structure as that of, the duplicate description is omitted.
  • the transmissive sheet 150A is, for example, a resin thin film sheet containing an OHP sheet.
  • the light transmittance in the region P1 is smaller than the light transmittance in the region Q1.
  • the light transmittance of the region P1 is 50%, and the light transmittance of the region Q1 is 95% or more.
  • a colored layer is covered with at least one surface of the resin thin film sheet which is the base layer (FIG. 5).
  • the color of the colored layer is, for example, gray.
  • the colored layer may be formed on both sides of the resin thin film.
  • the transmittance of light in the region P1 is determined based on the color intensity of the colored layer.
  • the image generation device 24A of this example includes the transmission sheet 150A that dims a part of the light corresponding to one side A1 of the image formable region A, the light forming the side A1 of the image formable region A is provided. Part of is dimmed. By dimming a part of the light forming the side A1, the difference in brightness between the inside of one side of the virtual image displayable area R corresponding to the side A1 and the outside of the side is reduced, and the virtual image displayable area is reduced. The outline of one side of R becomes inconspicuous. Therefore, it is possible to suppress giving a sense of discomfort to the occupant of the vehicle 1 who visually recognizes the virtual image object I1.
  • the optical member of this example includes the transmissive sheet 150B (FIG. 6) configured to dimming the light corresponding to the entire outer periphery of the image-forming region A, and the light of the transmissive sheet 150C.
  • the transmissive sheet 150C (FIG. 7) may be configured such that the transmittance of the transmissive sheet 150C gradually increases from the region P2 located on the outer periphery of the transmissive sheet 150C toward the region Q1 located in the center.
  • the color of the colored layer is light in the region P4, the color of the colored layer is dark in the region P2, and the color of the colored layer in the region P3 is lighter than the color of the colored layer in the region P2. It is darker than the color of the colored layer in P4.
  • the optical member that dims a part of the light corresponding to one side A1 of the image formable region A may be the absorption sheet 160A.
  • the absorption sheet 160A will be described with reference to FIGS. 2 to 7.
  • the structure of the absorption sheet 160A is the diffusion sheet 140A in terms of the arrangement position (between the lens 120 and the liquid crystal device 130), the shape (rectangular shape), and the form (regions Q1, P1, P1', P2, P3, P4). Since it has the same structure as that of, the duplicate description is omitted.
  • the absorption sheet 160A is, for example, a resin thin film sheet containing an OHP sheet.
  • the light absorption rate in the region P1 is larger than the light absorption rate in the region Q1.
  • the light absorption rate of the region P1 is 50%, and the light absorption rate of the region Q1 is less than 5%.
  • a colored layer is covered with at least one surface of the resin thin film sheet which is the base layer (FIG. 5).
  • the color of the colored layer is, for example, black.
  • the colored layer may be formed on both sides of the resin thin film.
  • the light absorption rate in the region P1 is determined based on the color intensity of the colored layer.
  • the image generation device 24A of this example includes the absorption sheet 160A that dims a part of the light corresponding to one side A1 of the image formable region A, the light forming the side A1 of the image formable region A is provided. Part of is dimmed. By dimming a part of the light forming the side A1, the difference in brightness between the inside of one side of the virtual image displayable area R corresponding to the side A1 and the outside of the side is reduced, and the virtual image displayable area is reduced. The outline of one side of R becomes inconspicuous. Therefore, it is possible to suppress giving a sense of discomfort to the occupant of the vehicle 1 who visually recognizes the virtual image object I1.
  • the optical member of this example includes the absorption sheet 160B (FIG. 6) configured to dimming the light corresponding to the entire outer periphery of the image-forming region A, and the light of the absorption sheet 160C.
  • the absorbent sheet 160C (FIG. 7) may be configured such that the absorption rate of the absorbent sheet 160C gradually decreases from the region P2 located on the outer periphery of the absorbent sheet 160C toward the region Q1 located in the center.
  • the color of the colored layer is light in the region P4
  • the color of the colored layer is dark in the region P2
  • the color of the colored layer in the region P3 is lighter than the color of the colored layer in the region P2. It is darker than the color of the colored layer in P4.
  • the optical member that dims a part of the light corresponding to one side A1 of the image formable region A may be the reflective sheet 170A.
  • the reflective sheet 170A will be described with reference to FIGS. 2 to 7.
  • the structure of the reflective sheet 170A is the same as that of the diffusion sheet 140A in terms of the arrangement position (between the lens 120 and the liquid crystal device), the shape (rectangular shape), and the form (regions Q1, P1, P1', P2, P3, P4). Since it is the same as the structure, duplicate explanations will be omitted.
  • the reflective sheet 170A is, for example, a resin thin film sheet containing an OHP sheet.
  • the reflectance of light in the region P1 is larger than the reflectance of light in the region Q1.
  • the reflectance of light in region P1 is 50%, and the reflectance of light in region Q1 is less than 5%.
  • the region P1 of the reflective sheet 170A is covered with a metal film on at least one surface of the resin thin film sheet which is the base layer (FIG. 5).
  • the metal film is formed by, for example, metal vapor deposition on a resin thin film sheet.
  • the metal is, for example, aluminum.
  • the metal film may be formed on both sides of the resin thin film.
  • the reflectance of light in the region P1 is determined based on the film thickness of the metal film. Due to this metal film, a part of the light emitted from the lens 120 is reflected when it is incident on the region P1. Since a part of the light incident on the region P1 is reflected by the metal film, the light reaching the liquid crystal device 130 is reduced, and as a result, the light incident on the liquid crystal device 130 is dimmed.
  • the image generation device 24A of this example includes the reflective sheet 170A that dims a part of the light corresponding to one side A1 of the image formable region A, the light forming the side A1 of the image formable region A is provided. Part of is dimmed. By dimming a part of the light forming the side A1, the difference in brightness between the inside of one side of the virtual image displayable area R corresponding to the side A1 and the outside of the side is reduced, and the virtual image displayable area is reduced. The outline of one side of R becomes inconspicuous. Therefore, it is possible to suppress giving a sense of discomfort to the occupant of the vehicle 1 who visually recognizes the virtual image object I1.
  • the optical member of this example includes the reflective sheet 170B (FIG. 6) configured to dimm the light corresponding to the entire outer periphery of the image-forming region A, and the light of the reflective sheet 170C.
  • the reflective sheet 170C (FIG. 7) may be configured such that the reflectance of the reflective sheet 170C gradually decreases from the region P2 located on the outer periphery of the reflective sheet 170C toward the region Q1 located in the center.
  • the film thickness of the metal film is thin in the region P4, the film thickness of the metal film is thick in the region P2, and the film thickness of the metal film in the region P3 is larger than the film thickness of the metal film in the region P2. It is also thin and thicker than the film thickness of the metal film in the region P4.
  • FIG. 8 is a schematic cross-sectional view in the left-right direction showing the configuration of the image generation device 24B.
  • the same or corresponding components as those of the image generator 24A according to FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted.
  • the image generator 24B includes a light source 111, a lens 120 (optical element), a liquid crystal device 130, and a diffusion sheet 140A (optical member).
  • the diffusion sheet 140A is arranged between the lens 120 and the liquid crystal device 130.
  • the liquid crystal device 130 is arranged between the lens 120 and the diffusion sheet 140A.
  • the diffusion sheet 140A is arranged above the liquid crystal device 130, and is light that has passed through both the lens 120 and the liquid crystal device 130, and is a part of the light corresponding to at least one side of the image-forming region A. Is configured to be dimmed.
  • the optical member of the image generation device 24B is not limited to the diffusion sheet 140A.
  • the optical member includes a diffusion sheet 140B configured to dimming light corresponding to the entire outer periphery of the image-formable region A, and a diffusion sheet in which the dimming rate of light gradually decreases from the outer periphery toward the center. It may be 140C.
  • the optical member may be a transmission sheet 150A, 150B, 150C, an absorption sheet 160A, 160B, 160C, or a reflection sheet 170A, 170B, 170C.
  • the diffusion sheet 140A is one of the light corresponding to at least one side A1 of the image formable region A.
  • the part can be dimmed.
  • dimming a part of the light forming the side A1 the difference in brightness between the inside of one side of the virtual image displayable area R corresponding to the side A1 and the outside of the side is reduced, and the virtual image displayable area is reduced.
  • the outline of one side of R becomes inconspicuous. Therefore, it is possible to suppress giving a sense of discomfort to the occupant of the vehicle 1 who visually recognizes the virtual image object I1.
  • the dimming rate of the light corresponding to the side A1 of the image-formable region A is the reduction of the light of the region Q1 including the center of the diffusion sheet 140A. Higher than the light rate. Therefore, the diffusion sheet 140A of this example can make the outline of one side of the virtual image displayable region R inconspicuous while ensuring the amount of light without diffusing the light forming the virtual image object I1 in the region Q1.
  • the optical member that dims a part of the light may be the cover 180A of the housing 180 of the image generator 24B.
  • the housing 180 is formed, for example, by resin molding, and is configured to accommodate and support the light source substrate 110, the lens 120, and the liquid crystal device 130.
  • the cover 180A is part of the housing 180 and is located above the liquid crystal device 130 and is configured to dimming at least a portion of the light that has passed through both the lens 120 and the liquid crystal device 130.
  • the cover 180A may be configured to completely block light that has passed through both the lens 120 and the liquid crystal device 130.
  • the cover 180A may be integrally formed with the housing 180, or may be a separate member from the housing 180.
  • the cover 180A may be a transparent member, may be colored gray or black, or may be metal-deposited on the surface facing the liquid crystal device 130 (lower surface in FIG. 8).
  • FIG. 9 is a plan view of the cover 180A as an example of the optical member.
  • the cover 180A includes four sides 181 to 184, four corners 185 to 188, a region P5 for dimming the light from the liquid crystal device 130, and a center of the cover 180A, the liquid crystal device 130. It has a region Q1 through which light from the light is transmitted without dimming.
  • the region Q1 is a space for passing the light forming the virtual image object I1.
  • the region P5 of the cover 180A is configured to dimm the light that has passed through both the lens 120 and the liquid crystal device 130 and corresponds to the entire outer circumference of the image-forming region A.
  • the cover 180A in FIG. 9 shows an example of dimming the light corresponding to the entire outer periphery of the image formable region A, but the cover 180A reduces a part of the light corresponding to at least one side of the image formable region A. It may be configured to shine.
  • the cover 180A dims the light corresponding to the entire outer periphery of the image formable region A, a part of the light forming the contour of the image formable region A is dimmed.
  • the contour of the corresponding virtual image displayable region R becomes inconspicuous. Therefore, it is possible to suppress giving a sense of discomfort to the occupant of the vehicle 1 who visually recognizes the virtual image object I1.
  • FIG. 10 shows a schematic cross-sectional view in the left-right direction showing the configuration of the image generation device 24C as a modification 3.
  • the same or corresponding components as those of the image generator 24A according to FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted.
  • the image generation device 24C includes a first diffusion sheet 140A (first optical member) and a second diffusion sheet 140D (second optical member).
  • the first diffusion sheet 140A is located below the liquid crystal device 130 and is arranged between the lens 120 and the liquid crystal device 130.
  • the second diffusion sheet 140D is arranged above the liquid crystal device 130. In other words, the liquid crystal device 130 is arranged between the first diffusion sheet 140A and the second diffusion sheet 140D.
  • the second diffusion sheet 140D is arranged so as to overlap the first diffusion sheet 140A in the vertical direction.
  • FIG. 11 shows a plan view of the second diffusion sheet 140D.
  • the second diffusion sheet 140D has the same shape as the first diffusion sheet 140A, and includes sides 141 to 144 and corners 145 to 148.
  • the first diffusing sheet 140A includes a side 141, two corners 145 and a corner 146, a region P1 that dims a part of the light from the lens 120, and a center of the diffusing sheet 140A, and includes light from the lens 120.
  • the second diffusion sheet 140D includes a side 142, two corners 147 and a corner 148, a region P6 for dimming a part of the light from the liquid crystal device 130, and a center of the second diffusion sheet 140D. It has a region Q2 for transmitting light from the liquid crystal device 130 without diffusing it.
  • the light diffusivity of the region P1 and the light diffusivity of the region P6 are both 50%, and the light diffusivity of the region Q1 and the light diffusivity of the region Q2 are both less than 5%.
  • the size of the overlapping region of the region Q1 and the region Q2 in the vertical direction is a size capable of transmitting the entire light forming the virtual image object I1. Both the region P1 and the region P6 are formed with fine irregularities, and diffuse the passing light in all directions.
  • the operation of the light of the image generator 24C will be described.
  • the light that has passed through the lens 120 first enters the first diffusion sheet 140A.
  • the region P1 dims the light corresponding to the side A1 (one side) of the image-formable region A.
  • the light that has passed through the region P1 or the region Q1 passes through the liquid crystal device 130 and is incident on the second diffusion sheet 140D.
  • the region P2 dims the light corresponding to the side A2 (other side) of the image-formable region A.
  • the light emitted from the lens 120 is dimmed by the first diffusion sheet 140A and the second diffusion sheet 140D, and as a result, corresponds to both the sides A1 and the sides A2 of the image-formable region A. The light is dimmed.
  • the image generation device 24C of this example corresponds to the first diffusion sheet 140A that dims a part of the light corresponding to one side A1 of the image formable region A and the other side A2 of the image formable region A. Since the second diffusion sheet 140D that dims a part of the light to be formed is provided, a part of the light forming the side A1 and the side A2 of the image-forming region A is dimmed. Therefore, it is possible to suppress giving a sense of discomfort to the occupant of the vehicle 1 who visually recognizes the virtual image object I1.
  • the image generator 24C includes a first diffusion sheet 140A and a second diffusion sheet 140D as optical members, but the optical member is not limited to the diffusion sheet.
  • the optical member may be any of a transmission sheet 150D, an absorption sheet 160D, a reflection sheet 170D, and a cover 180A. Further, the combination of the two optical members is not limited to the two diffusion sheets.
  • the first optical member may be a diffusion sheet, a transmissive sheet, an absorbent sheet, or a reflective sheet
  • the second optical member may be any of a transmissive sheet, an absorbent sheet, a reflective sheet, and a cover.
  • the liquid crystal device 130 of the present embodiment has one image-formable region A, but the number of image-formable regions is not limited to one.
  • FIG. 12 is a perspective view of a modified example of the liquid crystal device 130. As shown in FIG. 12, the liquid crystal device may have a plurality of image-formable regions B, C, and D.
  • the optical member is configured to dim a part of the light corresponding to one side or the entire outer circumference of each of the plurality of image-forming regions B, C, and D.
  • FIG. 13 is a schematic cross-sectional view showing the configuration of the image generator 24D according to the third embodiment.
  • FIG. 14 is a plan view of the light source substrate 110 of FIG. 13 as viewed from above.
  • FIG. 15 is a plan view of the liquid crystal device 130 of FIG. 13 as viewed from above.
  • the image generator 24D includes a light source substrate 110, a first optical system 220, a second optical system 230, a third optical system 240, and a liquid crystal device 130.
  • the first optical system 220 includes a first light source 221 and a first lens 222.
  • the second optical system 230 includes a second light source 231 and a second lens 232.
  • the second light source 231 includes a light source 231A and a light source 231B.
  • the third optical system 240 includes a third light source 241 and a third lens 242.
  • the light source substrate 110 is an example of a substrate.
  • the first lens 222 is an example of the first optical element.
  • the second lens 232 is an example of a second optical element.
  • Each of the first light source 221 and the second light source 231 and the third light source 241 is, for example, an LED light source or a laser light source.
  • the first light source 221 and the second light source 231 and the third light source 241 are mounted on the light source substrate 110.
  • the first light source 221 and the second light source 231 and the third light source 241 are arranged apart from each other in the left-right direction, for example, as illustrated in FIG.
  • the emission timings of the first light source 221 and the second light source 231 and the third light source 241 are individually controlled by the control unit 25.
  • Each of the first light source 221 and the second light source 231 and the third light source 241 may be composed of, for example, a plurality of light emitting units (light sources).
  • the first lens 222 is arranged above the first light source 221.
  • the first lens 222 is configured to transmit or reflect light incident from the first light source 221 and emit it toward the liquid crystal device 130.
  • the first lens 222 is, for example, a plano-convex aspherical lens in which the incident surface on which the light from the first light source 221 is incident is a plane and the exit surface on which the incident light is emitted is convex.
  • the first lens 222 is attached to a lens holder (not shown) so that, for example, the center of the light emitting surface of the first light source 221 is the focal position of the first lens 222.
  • the center of the light emitting surface of the first light source 221 is located near the focal point of the first lens 222 as long as the distortion and blurring of the image formed by the HUD 20 are within an acceptable range. It may be arranged as such.
  • the second lens 232 is arranged above the second light source 231.
  • the second lens 232 is configured to transmit or reflect the light incident from the second light source 231 and emit it toward the liquid crystal device 130.
  • the second lens 232 is, for example, a plano-convex aspherical lens in which the incident surface on which the light from the second light source 231 is incident is a plane and the exit surface on which the incident light is emitted is convex.
  • the second lens 232 is attached to the lens holder, for example, so that the center of the light emitting surface of the second light source 231 is the focal position of the second lens 232.
  • the center of the light emitting surface of the second light source 231 is located near the focal point of the second lens 232 as long as the distortion or blurring of the image formed by the HUD 20 is within an acceptable range. It may be arranged as such.
  • the third lens 242 is arranged above the third light source 241.
  • the third lens 242 is configured to transmit or reflect the light incident from the third light source 241 and emit it toward the liquid crystal device 130.
  • the third lens 242 is, for example, a plano-convex aspherical lens in which the incident surface on which the light from the third light source 241 is incident is a plane and the exit surface on which the incident light is emitted is convex.
  • the third lens 242 is attached to the lens holder, for example, so that the center of the light emitting surface of the third light source 241 is the focal position of the third lens 242.
  • the center of the light emitting surface of the third light source 241 is located near the focal point of the third lens 242 as long as the distortion or blurring of the image formed by the HUD 20 is within an acceptable range. It may be arranged as such.
  • the liquid crystal device 130 is arranged above the first lens 222, the second lens 232, and the third lens 242.
  • the liquid crystal device 130 is attached to a PGU housing (not shown) with a light emitting surface for emitting light for generating an image directed upward of the image generating device 24D.
  • the liquid crystal device 130 forms light for generating a plurality of images by the light emitted from the first optical system 220, the light emitted from the second optical system 230, and the light emitted from the third optical system 240. It is configured to emit light.
  • Each of the pixels constituting the liquid crystal panel 131 of the liquid crystal device 130 is in a state in which light emitted from the first optical system 220, the second optical system 230, or the third optical system 240 is transmitted or not transmitted by a drive circuit. Be controlled.
  • the liquid crystal device 130 has a first region 130A forming light for generating a first image and a second region 130B forming light for generating a second image. And has a third region 130C that forms the light for generating the third image.
  • the first image, the second image, and the third image are images showing different information.
  • the first region 130A, the second region 130B, and the third region 130C are arranged apart from each other in the left-right direction.
  • FIG. 15 shows an example of an image generated by light emitted from each of the first region 130A, the second region 130B, and the third region 130C.
  • the first image is, for example, an image showing information on the legal speed of the road on which the vehicle 1 is traveling.
  • the second image is, for example, an image showing information on the traveling direction of the vehicle 1.
  • the third image is, for example, an image showing information on the traveling speed of the current vehicle 1.
  • the first optical system 220 is configured to irradiate the first region 130A with light. That is, the light emitted from the first light source 221 is applied to the first region 130A by the first lens 222. By controlling the transmission and blocking of the light emitted from the first optical system 220 for each pixel corresponding to the first region 130A, the light for generating the first image is formed in the first region 130A.
  • the second optical system 230 is configured to irradiate the second region 130B with light. That is, the light emitted from the second light source 231 is applied to the second region 130B by the second lens 232. By controlling the transmission and blocking of the light emitted from the second optical system 230 for each pixel corresponding to the second region 130B, light for generating a second image is formed in the second region 130B.
  • the third optical system 240 is configured to irradiate the third region 130C with light. That is, the light emitted from the third light source 241 is irradiated to the third region 130C by the third lens 242. By controlling the transmission and blocking of the light emitted from the third optical system 240 for each pixel corresponding to the third region 130C, light for generating a third image is formed in the third region 130C. ..
  • the emission timings of the first light source 221 and the second light source 231 and the third light source 241 can be controlled by the control unit 25 so as to be linked with the operation control of the pixels constituting the liquid crystal panel 131.
  • the control unit 25 controls so that only the light source corresponding to the image to be displayed by the HUD 20 is turned on.
  • FIG. 16 is a diagram showing an example of the occupant's visual field area V in a state where a plurality of virtual image objects are displayed so as to be superimposed on the real space outside the vehicle 1 by the HUD 20.
  • the field of view region V shown in FIG. 16 includes a part of the vehicle 1 (bonnet or the like).
  • FIG. 16 shows a virtual image object when light for generating a plurality of images shown in FIG. 15 is emitted from the liquid crystal device 130. That is, the virtual image object IA indicating the information on the legal speed of the road on which the vehicle 1 is traveling, the virtual image object IB indicating the traveling direction of the vehicle 1, and the virtual image object IC indicating the information on the traveling speed of the current vehicle 1 are the virtual image object IC of the vehicle 1. It is displayed in front.
  • the square frame shown by the alternate long and short dash line indicates the position of the area R where the virtual image can be displayed for convenience, and the frame does not actually exist.
  • the virtual image displayable region R is included.
  • the area other than the virtual image objects IA, IB, and IC is visually recognized as faintly shining.
  • the brightness of the virtual image displayable area R becomes higher than the ambient brightness, and the outline of the virtual image displayable area R may be conspicuous.
  • the image generation device 24D is provided with independent optical systems corresponding to images showing information (contents) displayed by the HUD 20. Therefore, it is possible to prevent the light from reaching a portion of the liquid crystal device 130 other than the region forming the image to be displayed. As a result, it is possible to suppress the areas other than the virtual image object IA, the virtual image object IB, and the virtual image object IC to be displayed in the virtual image displayable area R displayed by the HUD 20 from shining faintly, and the contour of the virtual image displayable area R can be suppressed. Can be made inconspicuous.
  • the first lens 222, the second lens 232, and the third lens 242 are used as optical elements for irradiating the liquid crystal device 130 with light.
  • the liquid crystal device 130 can be irradiated with the light from the first light source 221 and the second light source 231 and the third light source 241 with a simple configuration.
  • the first light source 221 and the second light source 231 and the third light source 241 are arranged side by side in the arrangement direction of the first region 130A, the second region 130B, and the third region 130C. As a result, it is possible to suppress an increase in the area of the light source substrate 110.
  • the emission timings of the first light source 221 and the second light source 231 and the third light source 241 are individually controlled by the control unit 25.
  • the control unit 25 can control the first light source 221 to be turned on and the second light source 231 and the third light source 241 not to be turned on.
  • the control unit 25 can control the second light source 231 to be turned on and the first light source 221 and the third light source 241 not to be turned on.
  • the control unit 25 can control the third light source 241 to be turned on and the first light source 221 and the second light source 231 not to be turned on.
  • the ends of the first region 130A, the second region 130B, and the third region 130C are the upper ends of the liquid crystal panel 131, which is a region capable of forming an image of the liquid crystal device 130. It is located inward away from the portion (the end in the front direction in FIG. 15). That is, the light emitted from the first light source 221 is irradiated below the upper end portion of the liquid crystal panel 131 by the first lens 222. The light emitted from the second light source 231 is irradiated below the upper end portion of the liquid crystal panel 131 by the second lens 232.
  • the light emitted from the third light source 241 is irradiated below the upper end portion of the liquid crystal panel 131 by the third lens 242. Further, a length displaced downward (backward in FIG. 15) from the upper end of the liquid crystal panel 131 of the first region 130A, a length displaced downward from the upper end of the liquid crystal panel 131 of the second region 130B, and a third. The lengths of the region 130C deviated downward from the upper end of the liquid crystal panel 131 are different from each other.
  • the end of at least one of the first region 130A, the second region 130B, and the third region 130C is located away from the upper end portion or the left and right end portions of the liquid crystal panel 131. You may. Even in this case, even when the area other than the virtual image objects IA, IB, and IC shines faintly in the virtual image displayable region R displayed by the HUD 20, the faintly shining contour becomes uneven instead of a straight line, and the contour can be made inconspicuous. ..
  • the first lens 222, the second lens 232 and the third lens 242 are plano-convex aspherical lenses.
  • the first lens 222, the second lens 232, and the third lens 242 may include lenses having other shapes, such as an aspherical convex lens having both an incident surface and an emitted surface formed in a convex shape.
  • FIG. 17 is a schematic cross-sectional view showing the configuration of the image generation device 24E according to the fourth embodiment.
  • the same reference numbers are assigned to the same members as the members constituting the image generation device 24D of the third embodiment, and the description thereof will be omitted for convenience.
  • the image generator 24E includes a light source substrate 110, a first optical system 320, a second optical system 330, a third optical system 340, and a liquid crystal device 130.
  • the first optical system 320 includes a first light source 221 and a first reflector 322.
  • the second optical system 330 includes a second light source 231 and a second reflector 332.
  • the second light source 231 includes a light source 231A and a light source 231B.
  • the third optical system 340 includes a third light source 241 and a third reflector 342.
  • the first reflector 322 is an example of the first optical element.
  • the second reflector 332 is an example of a second optical element.
  • the first reflector 322 is arranged above the first light source 221.
  • the first reflector 322 is configured to reflect the light incident from the first light source 221 and emit it toward the first region 130A of the liquid crystal device 130.
  • the first reflector 322 has, for example, a reflecting surface made of a flat surface.
  • the second reflector 332 is arranged above the second light source 231.
  • the second reflector 332 is configured to reflect the light incident from the second light source 231 and emit it toward the second region 130B of the liquid crystal device 130.
  • the second reflector 332 has, for example, a reflecting surface made of a flat surface.
  • the third reflector 342 is arranged above the third light source 241.
  • the third reflector 342 is configured to reflect the light incident from the third light source 241 and emit it toward the third region 130C of the liquid crystal device 130.
  • the third reflector 342 has, for example, a reflecting surface made of a flat surface.
  • independent optical systems are provided corresponding to images showing information (contents) displayed by the HUD 20. Therefore, it is possible to prevent the light from reaching a portion of the liquid crystal device 130 other than the region forming the image to be displayed.
  • the first reflector 322, the second reflector 332, and the third reflector 342 are used as the optical elements, the light from the first light source 221 and the second light source 231 and the third light source 241 can be transferred to the liquid crystal device 130 by a simple configuration. It can be irradiated.
  • the light emitted from the image generator 24 is configured to be reflected by the concave mirror 26 and irradiated to the windshield 18, but the present invention is not limited to this.
  • the light reflected by the concave mirror 26 may be applied to a combiner (not shown) provided inside the windshield 18.
  • the combiner is composed of, for example, a transparent plastic disc. A part of the light emitted from the image generator 24 of the HUD main body 21 to the combiner is reflected toward the viewpoint E of the occupant as in the case of irradiating the windshield 18 with light.
  • first optical element and the second optical element, the first lens 222 and the second lens 232 are separately formed.
  • first lens 222 and the second lens 232 may be integrally formed as a single member.
  • first optical element and the second optical element, the first reflector 322 and the second reflector 332 may be integrally formed as a single member.
  • the liquid crystal device 130 has a first region 130A, a second region 130B, and a third region 130C as regions for forming light for generating an image.
  • the liquid crystal device 130 may have two regions or four or more regions. The number of optical systems can be appropriately changed according to the number of regions.
  • the first region 130A, the second region 130B, and the third region 130C are arranged apart from each other in the left-right direction.
  • the first region 130A, the second region 130B, and the third region 130C may be arranged apart from each other in the vertical direction, the horizontal direction, and the vertical direction, for example.
  • the arrangement of the light source, the lens or the reflector can be appropriately changed depending on the arrangement of the first region 130A, the second region 130B and the third region 130C.
  • the second region 130B is larger than the first region 130A and the third region 130C.
  • the second region 130B may be of the same size as, for example, the first region 130A and the third region 130C.
  • the number of light sources and the size of the lens or reflector can be appropriately changed according to the size of the corresponding region of the liquid crystal device 130.
  • the light emitted from the first optical systems 220 and 320 is applied to the first region 130A
  • the light emitted from the second optical systems 230 and 330 is applied to the second region 130B.
  • the light emitted from the optical systems 240 and 340 irradiates the third region 130C. That is, in the liquid crystal device 130, the range in which the light is irradiated by the first optical systems 220 and 320 and the range in which the light is irradiated by the second optical systems 230 and 330 do not overlap, and the second optical systems 230 and 330 do not overlap.
  • the range irradiated with light by the third optical system 240, 340 does not overlap with the range irradiated with light by the third optical system 240, 340.
  • the light emitted from the first optical systems 220 and 320 is irradiated in a wider range than the first region 130A, and the light emitted from the second optical systems 230 and 330 is emitted from the second region 130B.
  • the light emitted from the third optical system 240, 340 can be irradiated in a wider range than the third region 130C.
  • the range irradiated by the first optical systems 220 and 320 and the range irradiated by the second optical systems 230 and 330 may partially overlap.
  • the range illuminated by the second optical systems 230, 330 and the range illuminated by the third optical systems 240, 340 may partially overlap.
  • the light in the overlapping range is weaker than the light emitted to the center of each optical system, so that the boundary between the first image and the second image becomes inconspicuous, and the boundary between the second image and the third image becomes inconspicuous. It becomes inconspicuous.
  • the contour of the region where the first image corresponding to the first region 130A can be formed can be made inconspicuous.
  • the contour of the region where the second image corresponding to the second region 130B can be formed and the contour of the region where the third image corresponding to the third region 130C can be formed can be made inconspicuous.
  • the image generators 24D and 24E may include, for example, a heat sink provided on the back surface of the light source substrate 110.
  • the heat sink can dissipate heat generated from the light source substrate 110.
  • the image generation devices 24D and 24E may include a diffusion sheet or the like between the optical system and the liquid crystal device 130.
  • the first reflector 322, the second reflector 332, and the third reflector 342 have a reflecting surface made of a flat surface.
  • the first reflector 322, the second reflector 332, and the third reflector 342 may have a reflecting surface made of a spheroidal surface or the like.
  • the HUD 20 has a plane mirror 28 and a concave mirror 26 as reflectors, and the light emitted from the image generator 24 is reflected twice and reaches the windshield 18.
  • the HUD 20 has only a concave mirror 26 as a reflector, and the light emitted from the image generator 24 may be reflected once and reach the windshield 18.

Abstract

Un appareil de génération d'image (24) selon l'invention, qui génère une image sur un affichage tête haute (20), comprend une source de lumière (111), un dispositif à cristaux liquides (130), un élément optique (120) et un organe optique (140A). Le dispositif à cristaux liquides (130) a une région d'affichage (A) ayant une forme rectangulaire, et forme une lumière de façon à générer une image en utilisant la lumière émise par la source de lumière (111). L'élément optique (120) irradie le dispositif à cristaux liquides (130) avec la lumière émise par la source de lumière (111). L'organe optique (140A) fait varier l'intensité de la lumière correspondant à au moins un bord de la région d'affichage (A).
PCT/JP2021/024175 2020-07-20 2021-06-25 Appareil de génération d'image et affichage tête haute WO2022019048A1 (fr)

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WO2024090552A1 (fr) * 2022-10-28 2024-05-02 株式会社小糸製作所 Dispositif de projection d'image et dispositif d'affichage d'image

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JPH05323316A (ja) * 1992-05-20 1993-12-07 Canon Inc バックライト装置
US20060066508A1 (en) * 2001-01-16 2006-03-30 Walck Scott D Image display system utilizing light emitting material
JP2008089753A (ja) * 2006-09-29 2008-04-17 Fujifilm Corp 半導体レーザ光源ユニット
JP2015045735A (ja) * 2013-08-28 2015-03-12 日本精機株式会社 バックライトユニット、及び表示装置
JP2015099186A (ja) * 2013-11-18 2015-05-28 三菱電機株式会社 車両用表示装置
WO2016027705A1 (fr) * 2014-08-20 2016-02-25 日本精機株式会社 Dispositif d'affichage à cristaux liquides et dispositif d'affichage tête haute
JP2016071062A (ja) * 2014-09-29 2016-05-09 株式会社 オルタステクノロジー ヘッドアップディスプレイ装置
WO2018055722A1 (fr) * 2016-09-23 2018-03-29 マクセル株式会社 Dispositif d'éclairage pour la projection vidéo
JP2018075983A (ja) * 2016-11-10 2018-05-17 日本精機株式会社 ヘッドアップディスプレイ装置

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Publication number Priority date Publication date Assignee Title
JPH05323316A (ja) * 1992-05-20 1993-12-07 Canon Inc バックライト装置
US20060066508A1 (en) * 2001-01-16 2006-03-30 Walck Scott D Image display system utilizing light emitting material
JP2008089753A (ja) * 2006-09-29 2008-04-17 Fujifilm Corp 半導体レーザ光源ユニット
JP2015045735A (ja) * 2013-08-28 2015-03-12 日本精機株式会社 バックライトユニット、及び表示装置
JP2015099186A (ja) * 2013-11-18 2015-05-28 三菱電機株式会社 車両用表示装置
WO2016027705A1 (fr) * 2014-08-20 2016-02-25 日本精機株式会社 Dispositif d'affichage à cristaux liquides et dispositif d'affichage tête haute
JP2016071062A (ja) * 2014-09-29 2016-05-09 株式会社 オルタステクノロジー ヘッドアップディスプレイ装置
WO2018055722A1 (fr) * 2016-09-23 2018-03-29 マクセル株式会社 Dispositif d'éclairage pour la projection vidéo
JP2018075983A (ja) * 2016-11-10 2018-05-17 日本精機株式会社 ヘッドアップディスプレイ装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024090552A1 (fr) * 2022-10-28 2024-05-02 株式会社小糸製作所 Dispositif de projection d'image et dispositif d'affichage d'image

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