WO2017141491A1 - ヘッドアップディスプレイ装置 - Google Patents

ヘッドアップディスプレイ装置 Download PDF

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Publication number
WO2017141491A1
WO2017141491A1 PCT/JP2016/081202 JP2016081202W WO2017141491A1 WO 2017141491 A1 WO2017141491 A1 WO 2017141491A1 JP 2016081202 W JP2016081202 W JP 2016081202W WO 2017141491 A1 WO2017141491 A1 WO 2017141491A1
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WO
WIPO (PCT)
Prior art keywords
plate
light
refractive index
head
thickness direction
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PCT/JP2016/081202
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English (en)
French (fr)
Japanese (ja)
Inventor
潤也 横江
孝啓 南原
昌之 山口
Original Assignee
株式会社デンソー
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Publication of WO2017141491A1 publication Critical patent/WO2017141491A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
    • B60K35/23—Head-up displays [HUD]
    • B60K35/234—Head-up displays [HUD] controlling the brightness, colour or contrast of virtual images depending on the driving conditions or on the condition of the vehicle or the driver
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/50—Instruments characterised by their means of attachment to or integration in the vehicle

Definitions

  • the present disclosure relates to a head-up display device that is mounted on a moving body and displays a virtual image so that an image can be viewed by an occupant.
  • a head-up display device (hereinafter abbreviated as a HUD device) that is mounted on a moving body and displays a virtual image so that an image can be visually recognized by an occupant is known.
  • the device disclosed in Patent Document 1 includes a projection unit that projects display light, and a plate-shaped light transmitting plate that is disposed on an optical path from the projection unit to the projection member and transmits the display light.
  • This light-transmitting plate is formed by rolling during the manufacturing process, and the refractive index in the rolling direction is different from the refractive index in the direction perpendicular to the rolling direction.
  • Patent Document 1 it is considered that the brightness of the virtual image is adjusted by arranging the plate thickness direction along the optical axis, and rotating the translucent plate around the optical axis to adjust the rotation angle.
  • the present disclosure has been made in view of the above-described problems, and an object thereof is to provide a HUD device capable of realizing a virtual image that is easy to visually recognize.
  • the head-up display device is mounted on a moving body and displays a virtual image that can be visually recognized by an occupant by reflecting display light on a projection member of the moving body.
  • the head-up display device includes a projection unit that projects the display light.
  • the head-up display device further includes a plate-like translucent plate that is disposed on an optical path from the projection unit to the projection member and has translucency.
  • the translucent plate has a refractive index in the plate thickness direction, a refractive index in a first extending direction perpendicular to the plate thickness direction, and a first perpendicular to the plate thickness direction and the first extending direction. 2
  • the refractive indexes in the extending direction are different from each other.
  • the translucent plate is further arranged with the plate thickness direction inclined with respect to the optical axis.
  • the drawing It is a figure which shows the mounting state to the vehicle of the HUD apparatus in 1st Embodiment, It is a figure which shows schematic structure of the HUD apparatus in 1st Embodiment, It is a schematic diagram which shows the projection part in 1st Embodiment, It is a figure for demonstrating the longitudinal direction and transversal direction of the screen of the liquid crystal panel in 1st Embodiment, It is a graph showing the relationship between the inclination angle in the plate thickness direction with respect to the optical axis and the phase difference exerted on the display light, It is a figure for demonstrating an example of arrangement
  • FIG. 6B in the state where the light transmission plate is rotated according to FIG.
  • a graph In the comparative example, it is a graph showing the relationship between the rotation angle and the relative luminance of the virtual image, In a comparative example, it is a figure for explaining an operation of a translucent plate, It is a figure for demonstrating an example of arrangement
  • FIG. 9 is a diagram corresponding to FIG. 2 in Modification 1.
  • the HUD device 100 As shown in FIG. 1, the HUD device 100 according to the first embodiment of the present disclosure is mounted on a vehicle 1 that is a kind of moving body, and is accommodated in an accommodation portion 2 a of an instrument panel 2.
  • the HUD device 100 projects an image on a windshield 3 as a projection member of the vehicle 1.
  • the HUD device 100 displays a virtual image VI that can be visually recognized by an occupant seated on the seat 4 in the vehicle 1. That is, the display light reflected by the windshield 3 reaches the occupant's eyes in the vehicle 1 and the occupant perceives the display light as a virtual image VI.
  • a crew member can recognize various information by virtual image VI. Examples of the various information displayed as the virtual image VI include vehicle state values such as vehicle speed and fuel remaining amount, or navigation information such as road information and visibility assistance information.
  • the windshield 3 of the vehicle 1 is formed in a translucent plate shape with glass or synthetic resin.
  • the surface on the indoor side forms a reflecting surface 3a on which an image is projected in a concave shape or a flat shape.
  • the shape of the windshield 3 and the relative positions of the housing portion 2a of the instrument panel 2 and the seat 4 with respect to the windshield 3 are generally set by the vehicle manufacturer based on the use or design of the vehicle 1 and the like.
  • the display light reflected by the windshield 3 is applied to a viewing area EB that is set so as to overlap with an eyelid (for details, refer to JIS D0021: 1998), which is an area where there is a high possibility of the presence of an occupant's eye seated on the seat 4.
  • the HUD device 100 is optically designed.
  • the visual recognition area EB is a spatial area in which the virtual image VI displayed by the HUD device is visible.
  • the mounting conditions such as the incident angle of the display light on the windshield 3 vary depending on the vehicle type of the vehicle 1 to be mounted and are restricted.
  • the HUD device 100 includes a housing member 10, a projection unit 20, a plane mirror 30, a concave mirror 40, and a light transmitting plate 50.
  • the housing member 10 is a member that is formed into a light-shielding box shape using, for example, a synthetic resin, and houses the projection unit 20, the plane mirror 30, the concave mirror 40, and the translucent plate 50.
  • the housing member 10 has a window-shaped window portion 12 at a location facing the windshield 3.
  • the projection unit 20 includes a light source 22, a condenser lens 24, a projection lens 26, and a liquid crystal panel 28.
  • the projection unit 20 is formed by housing them in a box-shaped casing 20 a. Yes.
  • the light source 22 is, for example, a plurality of light emitting diode elements, and is disposed on the light source circuit board 22a.
  • the light source 22 is electrically connected to a power source through a wiring pattern on the light source circuit board 22a.
  • the light source 22 emits light source light with a light emission amount corresponding to a current amount when energized. Thereby, the light source 22 projects the light source light toward the condenser lens 24. More specifically, the light source 22 emits pseudo white light, for example, by covering a blue light emitting diode with a phosphor.
  • the condensing lens 24 is a lens array that is disposed between the light source 22 and the projection lens 26 and in which translucent convex lens elements made of synthetic resin or glass are arranged in accordance with the number of light emitting diodes.
  • the condensing lens 24 condenses the light source light from the light source and emits it toward the projection lens 26.
  • the projection lens 26 is disposed between the condenser lens 24 and the liquid crystal panel 28, and is a translucent Fresnel lens made of synthetic resin or glass.
  • the projection lens 26 condenses the light source light from the condenser lens 24 and emits it toward the liquid crystal panel 28.
  • the liquid crystal panel 28 is a liquid crystal panel using, for example, a thin film transistor (TFT), and is an active matrix type liquid crystal panel formed from a plurality of liquid crystal pixels arranged in a two-dimensional direction.
  • TFT thin film transistor
  • the polarizing plate has a property of transmitting light polarized along a predetermined direction and shielding light polarized along a direction perpendicular to the predetermined direction, and the pair of polarizing plates have the predetermined direction substantially orthogonal to each other. Be placed.
  • the liquid crystal layer can rotate the polarization direction of light incident on the liquid crystal layer in accordance with the applied voltage by applying a voltage for each liquid crystal pixel.
  • the liquid crystal panel 28 controls the transmittance of the light source light for each liquid crystal pixel, so that the projection unit 20 can project image display light.
  • the display light is projected from the projection unit 20 as light that is linearly polarized in the direction PAD of the polarization axis as the predetermined direction of the polarizing plate on the exit side.
  • the screen of the liquid crystal panel 28 is formed in a rectangular shape having the longitudinal direction LD and the lateral direction SD, and the polarization axis direction PAD is set to a direction that forms 135 degrees with respect to the longitudinal direction LD. ing.
  • the display light projected on the projection unit 20 enters the plane mirror 30.
  • the plane mirror 30 is formed by evaporating aluminum as the reflecting surface 32 on the surface of a base material made of synthetic resin or glass.
  • the reflection surface 32 is formed in a smooth flat shape.
  • the plane mirror 30 reflects the display light from the projection unit 20 toward the concave mirror 40.
  • the concave mirror 40 is formed by evaporating aluminum as the reflective surface 42 on the surface of a base material made of synthetic resin or glass.
  • the reflecting surface 42 is formed in a smooth curved surface as a concave surface in which the center of the concave mirror 40 is recessed.
  • the concave mirror 40 reflects the display light from the plane mirror 30.
  • the display light reflected by the concave mirror 40 is directed to the windshield 3 through the translucent plate 50.
  • an optical path OP from the projection unit 20 to the windshield 3 is configured.
  • the translucent plate 50 is disposed on the optical path OP and is formed in a flat plate shape having translucency.
  • the translucent plate 50 of this embodiment is disposed so as to close the window 12 of the housing member 10 on the optical path between the concave mirror 40 and the windshield 3.
  • a plate thickness direction VD can be defined as a direction along the normal direction of the surface.
  • a first extending direction MD perpendicular to the plate thickness direction VD can be defined.
  • a second extending direction TD perpendicular to the plate thickness direction VD and the first extending direction MD can be defined.
  • the light transmitting plate 50 is made of synthetic resin such as polycarbonate resin or acrylic resin.
  • the translucent plate 50 of the present embodiment has a plate thickness that is a dimension along the plate thickness direction VD, for example, 0.5 mm, and the entire plate thickness is substantially the same.
  • the translucent plate 50 has a refractive index N VD in the plate thickness direction VD, a refractive index N MD in the first extending direction MD , and a refractive index N TD in the second extending direction TD different from each other.
  • the refractive index N VD 1.5845 in the plate thickness direction VD
  • the refractive index N MD 1.5853 in the first extending direction MD
  • TD 1.5851.
  • These refractive indexes N VD , N MD , and N TD are refractive indexes for light having a wavelength of 580 nm.
  • the translucent plate 50 is arranged with the plate thickness direction VD inclined with respect to the optical axis OA.
  • the translucent plate 50 is fixedly arranged in a state where the plate thickness direction VD is inclined with respect to the optical axis OA.
  • the optical axis OA in the present embodiment refers to the light beam obtained by tracing light rays from the center pixel of the screen to the center of the viewing area EB among the liquid crystal pixels arranged in the two-dimensional direction on the liquid crystal panel 28. It is a route.
  • the optical axis OA is a path of a principal ray emitted perpendicularly to the screen from the pixel that is the center of the screen.
  • a longitudinal corresponding direction RLD corresponding to the longitudinal direction LD of the screen and a short corresponding direction RSD corresponding to the lateral direction SD of the screen Define.
  • the longitudinal corresponding direction RLD is a direction obtained by projecting on the virtual plane IP along the optical axis OA using the longitudinal direction LD on the screen as a vector.
  • the short correspondence direction RSD is a direction obtained by projecting the short direction SD on the screen onto the virtual plane IP along the optical axis OA as a vector.
  • the display light is transmitted through the light transmitting plate 50 provided with the plate thickness direction VD inclined, for example, along the optical axis OA.
  • the refractive indexes N VD , N MD , and N TD in the directions VD, MD, and TD are different, a phase difference is generated in the display light, the azimuth angle of the polarization is rotated, and the ellipticity of the polarization is Will change.
  • FIG. 5 plots the relationship between the tilt angle when the light transmitting plate 50 is rotated about the first extending direction MD (see FIG. 6A) and the phase difference exerted on the display light. Yes.
  • the phase difference is less than 150 nm in terms of distance.
  • the phase difference gradually increases from around 20 degrees, and at a tilt angle of 45 degrees, a phase difference greater than 200 nm can be obtained in terms of distance.
  • the phase difference in FIG. 5 is a phase difference with respect to light having a wavelength of 580 nm. Therefore, when the tilt angle is 0 degree, the translucent plate 50 functions as a substantially quarter-wave plate and increases the tilt angle. As a result, the function of the half-wave plate can be approached.
  • FIG. 7 shows the rotation angle when the translucent plate is rotated with the plate thickness direction VD as the rotation axis in the state of the inclination angle of 45 degrees as described above (see FIG. 6B), and the visual recognition.
  • the relationship with the relative luminance of the virtual image VI is plotted. According to this, when the rotation angle of the translucent plate 50 is about 150 degrees, the relative luminance is 15685, which is the maximum value. Further, when the rotation angle of the translucent plate 50 is about 30 degrees, the relative luminance is 2629, which is the minimum value.
  • the rotation angle of the translucent plate 50 is based on the longitudinal corresponding direction RLD. That is, when the first extending direction MD coincides with the longitudinal corresponding direction RLD, it is 0 degree.
  • FIG. 8 shows the relationship between the rotation angle when the translucent plate is rotated about the plate thickness direction VD and the relative luminance of the visible virtual image VI in a state where the inclination angle is 0 degree. It is plotted. According to this, when the rotation angle of the translucent plate is 67.5 degrees or 157.5 degrees, the relative luminance is 14950, which is the maximum value. Further, when the rotation angle of the translucent plate 50 is about 20 degrees or about 110 degrees, the relative luminance is 5051, which is the minimum value.
  • the reflection cross section WRP of the windshield 3 is disposed along a direction that forms 90 degrees with respect to the longitudinal corresponding direction RLD. Therefore, if the display light after passing through the light transmitting plate 50 is polarized light having a large amount of components in the direction ND (that is, 0 degree) perpendicular to the reflection cross section WRP, the reflectance of the display light in the windshield 3 is increased. The brightness of the virtual image VI can be increased.
  • the first extending direction MD is set to 67.5 degrees or 157.5 degrees which is an intermediate between the angle of the polarization axis direction PAD of the projection unit and the angle ND perpendicular to the reflection cross section WRP. When set, it is considered that the luminance can be increased. However, in the comparative example, since a sufficient phase difference was not given to the display light, the maximum value of the relative luminance is small compared to the present embodiment.
  • the first extending direction MD that can be defined based on the light transmitting plate 50 is used as the rotation axis, and the plate thickness direction VD of the light transmitting plate 50 is arranged in an inclined state with respect to the optical axis OA.
  • the plate thickness direction VD may be arranged in an inclined state with respect to the optical axis OA by a rotation axis defined based on the image of the projection unit 20.
  • the longitudinal corresponding direction RLD is rotated by ⁇ degrees (FIG. 10 ( a)).
  • the translucent plate 50 is rotated by ⁇ degrees about the short side corresponding direction RSD as a rotation axis (see FIG. 10B).
  • the plate thickness direction VD of the translucent plate 50 is inclined with respect to the optical axis OA.
  • the light transmitting plate 50 it is not always optimal to arrange the light transmitting plate 50 so that the relative luminance takes the maximum value. This is because the relative luminance in FIGS. 5, 7, and 11 is luminance when the occupant with naked eyes visually recognizes the virtual image VI, and there is room for considering the visibility of the virtual image VI by the occupant wearing polarized sunglasses. That is, the translucent plate 50 may be arranged in a state of being deviated from the maximum value so that the visibility of the occupant wearing the naked eye and the occupant wearing the polarized sunglasses is balanced.
  • the translucent plate 50 in the present embodiment is a virtual ellipsoid whose optical axis OA passes through the center, and the main axis is taken in the plate thickness direction VD, the first extending direction MD, and the second extending direction TD.
  • a refractive index ellipsoid RIE is defined in which the length of each is a half value of the refractive indexes N VD , N MD , N TD in the corresponding directions VD, MD, TD.
  • a virtual elliptical cut surface SE that passes through the center of the refractive index ellipsoid RIE and is a cross section perpendicular to the optical axis OA is defined.
  • the absolute value of the difference in length between the major axis MAA and the minor axis MIA on the elliptical cut surface SE is the refractive index N MD in the first extending direction MD and the refractive index N in the second extending direction TD.
  • the translucent plate 50 is disposed so as to be larger than the absolute value of the difference from TD .
  • Equation 2 the left side is the absolute value of the difference in length between the major axis MAA and the minor axis MIA in the elliptical cut surface SE, and the right side is the refractive index NMD of the first extending direction MD and the second extending direction TD. Is the absolute value of the difference from the refractive index NTD .
  • a plate-like translucent plate 50 having translucency is arranged on the optical path OP from the projection unit 20 to the windshield 3.
  • Transparent plate 50 has a refractive index N VD in the thickness direction VD, and the refractive index N MD of the first extension direction MD, and a refractive index N TD of the second extension direction TD, because they were different from each other
  • the display light projected on the projection unit 20 may cause a phase difference before reaching the windshield 3.
  • the transparent plate 50 from being disposed to be inclined to the thickness direction VD with respect to the optical axis OA, by utilizing a difference in refractive index N VD in the thickness direction VD, the phase difference corresponding to the inclination Can be realized.
  • the absolute value of the difference in length between the major axis MAA and the minor axis MIA in the virtual elliptical cutting plane SE is the refractive index NMD in the first extending direction MD and the second extending length. It is larger than the absolute value of the difference between the refractive index N TD direction TD.
  • the phase difference acting on the display light can be made larger than when the plate thickness direction VD is arranged along the optical axis OA. Therefore, even under the restrictions of being mounted on the vehicle 1, it is possible to reliably improve the state of reflection by the windshield 3 and provide a virtual image VI that is easy to visually recognize.
  • the flat light transmitting plate 50 of the first embodiment it is easy to exert the same adjustment action on the entire display light, so that the luminance unevenness of the virtual image VI can be suppressed.
  • the housing member 10 that houses the projection unit 20 is further provided, and the translucent plate 50 is disposed so as to close the window portion 12 of the housing member 10. Since the translucent plate 50 can prevent foreign matter from entering the inside of the apparatus 100 from the outside, it is possible to maintain the virtual image VI that is easy to visually recognize for a long time while suppressing an increase in the number of parts. .
  • the second embodiment of the present disclosure is a modification of the first embodiment.
  • the second embodiment will be described with a focus on differences from the first embodiment.
  • the translucent plate 250 of the second embodiment is provided so as to close the window 12 of the housing member 10 on the optical path between the concave mirror 40 and the windshield 3 as in the first embodiment.
  • the translucent plate 250 of the second embodiment is formed in a curved plate shape. Specifically, the translucent plate 250 is curved in a concave shape so as to enter the inside of the HUD device 200.
  • the said curve is a cylindrical curve, for example, and the curvature radius in this curve is set to 150 cm, for example.
  • the entire light-transmitting plate 250 has substantially the same thickness.
  • the optical axis OA and the translucent plate 250 are fixedly arranged in a state where the thickness direction VD is inclined with respect to the optical axis OA at a location where the optical axis OA and the translucent plate 250 intersect.
  • the plate thickness direction VD coincides with the direction of the optical axis OA exists outside the optical axis OA.
  • the translucent plate 250 can exert a corresponding action on the display light.
  • the curved surface-shaped translucent plate 250 is arranged to be inclined with respect to the optical axis OA, so that external light such as sunlight that can enter from the outside of the device 100 to the inside can be obtained. Since the light can be reflected by the translucent plate 250 so as not to reach the occupant side, it is possible to realize a phase difference corresponding to the inclination while suppressing deterioration of the contrast of the virtual image VI due to external light. Therefore, it is possible to provide a virtual image VI that is easy to visually recognize.
  • the third embodiment of the present disclosure is a modification of the second embodiment.
  • the third embodiment will be described with a focus on differences from the second embodiment.
  • the light transmitting plate 350 of the third embodiment is disposed on the optical path between the concave mirror 40 and the windshield 3 so as to close the window 12 of the housing member 10.
  • the HUD device 300 further includes a polarizing plate 352 bonded to the translucent plate 350 as a visual restriction unit.
  • the polarizing plate 352 closes the window portion 12 together with the translucent plate 350 while being bonded to the translucent plate 350.
  • the polarizing plate 352 of the present embodiment is an absorptive polarizing plate formed by adding iodine, which is a dichroic dye, to polyvinyl alcohol.
  • the polarizing plate 352 has a transmission axis and an absorption axis orthogonal to each other depending on the orientation direction of iodine molecules.
  • the polarizing plate 352 has a property of transmitting light polarized along the transmission axis and absorbing light polarized along the absorption axis.
  • the polarizing plate 352 is disposed, for example, on the concave mirror side of the translucent plate 350, with its transmission axis aligned with the polarization direction (that is, the polarization axis direction PAD) in the linearly polarized display light projected from the projection unit 20. ing.
  • the polarizing plate 352 allows most of the display light to pass through the light transmitting plate 350 as it is, while restricting the inside of the housing member 10 from being visually recognized from the outside.
  • the polarizing plate 352 blocks part of external light such as sunlight that enters the HUD device 300 from the outside of the vehicle 1 through the windshield 3, for example.
  • the window 12 is closed together with the light transmissive plate 350 in a state where the visual restriction portion is bonded to the light transmissive plate 350, and the inside of the housing member 10 is restricted from being visually recognized.
  • the display light collectively transmits through the visual restriction part and the translucent plate 350, so that it is difficult to look into the inside while suppressing loss of luminance.
  • the visual restriction part is the polarizing plate 352. According to this, by allowing the linearly polarized projection light to pass through the polarizing plate 352, it is possible to make it difficult to look inside the apparatus 300 while reliably suppressing loss of luminance.
  • the fourth embodiment of the present disclosure is a modification of the second embodiment.
  • the fourth embodiment will be described with a focus on differences from the second embodiment.
  • the light transmitting plate 450 closes the window 12 of the housing member 10 on the optical path between the concave mirror 40 and the windshield 3 as in the first to third embodiments. Has been placed.
  • the translucent plate 450 of the fourth embodiment is colored while having translucency.
  • the translucent plate 450 is colored, for example, in a smoke tone. It is preferable that the hue in coloring is the same system as the hue of the instrument panel 2, for example.
  • a method for coloring the light transmitting plate 450 a method such as coloring the light transmitting plate 450 with a dye or printing on the surface of the light transmitting plate 450 can be employed.
  • the colored translucent plate 450 can make it difficult to look inside the apparatus 400 while suppressing an increase in the number of parts.
  • the translucent plate 50 does not have to block the window 12 of the housing member 10.
  • the translucent plate 50 is disposed on the optical path between the projection unit 20 and the plane mirror 30 with the plate thickness direction VD inclined with respect to the optical axis OA.
  • the translucent plate 50 is not limited to the one that is fixedly arranged with the plate thickness direction VD inclined with respect to the optical axis OA.
  • the HUD device 100 may further include a movable mechanism that changes the thickness direction VD of the translucent plate 50 with respect to the optical axis OA.
  • the visibility variation of the virtual image VI due to the brightness error of the display light of the projection unit 20 and the positional relationship error that may occur in the manufacturing process can be adjusted by the movable mechanism.
  • the polarizing plate 352 used as the visual restriction part may be disposed closer to the windshield 3 than the translucent plate 350.
  • the polarizing plate 352 used as the visual restriction part may be a reflective polarizing plate.
  • a film-like half mirror may be employed as the visual restriction part.
  • the projection unit 20 may employ a method other than the method using the liquid crystal panel 28.
  • the projection unit 20 may be a method of projecting the laser beam constituting the pixels of the image as display light by scanning the laser beam and drawing an image on the screen.
  • the optical axis OA is a path of the laser beam that constitutes the pixel at the center of the image.
  • the present disclosure may be applied to various moving bodies (transport equipment) such as a ship other than the vehicle 1 or an airplane.
  • the above-described head-up display device is mounted on the moving body 1 and reflects the display light on the projection member 3 of the moving body, thereby displaying the virtual image VI that can be visually recognized by the passenger.
  • the head-up display device includes a projection unit 20 and translucent plates 50, 250, 350, and 450.
  • the projection unit 20 projects display light.
  • the translucent plates 50, 250, 350, and 450 are plate-shaped and are disposed on the optical path OP from the projection unit to the projection member.
  • the translucent plate has a refractive index in the plate thickness direction VD, a refractive index in the first extending direction MD perpendicular to the plate thickness direction, and a second extension perpendicular to the plate thickness direction and the first extending direction.
  • the refractive indexes in the installation direction TD are different from each other.
  • the translucent plate is further arranged with the plate thickness direction inclined with respect to the optical axis OA.
  • a light-transmitting plate-like light transmitting plate is disposed on the optical path from the projection unit to the projection member.
  • the light transmitting plate has a refractive index in the plate thickness direction, a refractive index in the first extending direction, and a refractive index in the second extending direction different from each other. Therefore, the display light projected on the projection unit may cause a phase difference before reaching the projection member. Furthermore, since the translucent plate is disposed with the plate thickness direction inclined with respect to the optical axis, a phase difference corresponding to the inclination can be realized by utilizing a difference in refractive index in the plate thickness direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Instrument Panels (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
PCT/JP2016/081202 2016-02-16 2016-10-21 ヘッドアップディスプレイ装置 WO2017141491A1 (ja)

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JP2016027338A JP6432540B2 (ja) 2016-02-16 2016-02-16 ヘッドアップディスプレイ装置
JP2016-027338 2016-02-16

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019102775A1 (ja) * 2017-11-22 2019-05-31 日本精機株式会社 ヘッドアップディスプレイ装置
CN110208943A (zh) * 2018-02-28 2019-09-06 松下知识产权经营株式会社 显示系统和移动体
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