JP6056680B2 - Head-up display device - Google Patents

Description

  The present invention projects a display image onto a projection surface of a moving body such as a vehicle, thereby displaying a virtual image of the display image so as to be visible from the interior of the moving body (hereinafter referred to as “HUD device”). Related to.

  2. Description of the Related Art Conventionally, there has been known a HUD device in which display light serving as a display image is projected and diffused from a projector onto a screen member, and the diffused display light is guided to a projection surface side by an optical member.

  A HUD device disclosed in Patent Document 1 as a kind of such device has an array surface on which an optical plate as a screen member is arranged with a plurality of optical elements arranged in a lattice shape, and displays the display light from the projector. A display image can be formed on the array surface by projection. At the same time, the apparatus HUD disclosed in Patent Document 1 has an incident surface on which the diffused display light is directly incident from the optical plate, on a mirror as an optical member, and displays by a reflection action on the incident surface. Light can be guided.

JP 2009-128659 A

  However, in the HUD device disclosed in Patent Document 1, when external light enters the incident surface from the outside of the HUD device and is guided to the screen member side, there is a concern that it may be reflected by the array surface and return to the incident surface. The In this case, reflected light of outside light on the array surface (hereinafter referred to as “outside light reflected light”) is guided from the incident surface to the projection surface side as well as display light to be a display image. As a result, the display image is displayed as a virtual image by the display light on which the external light reflected light overlaps, and thus the visibility of the display image is deteriorated due to disturbance or a decrease in contrast ratio.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a HUD device with improved visibility of a display image displayed as a virtual image.

Therefore, one disclosed invention projects the display image (71) onto the projection surface (91) of the moving body (2), thereby converting the virtual image (70) of the display image into the visual recognition area ( 60) a head-up display device that displays in a visible manner, an array in which a projector (10) that projects display light for forming a display image and a plurality of optical elements (33) are arranged in a grid pattern. A screen member (31, 2031, 3031) having a surface (32, 2032, 3032) for diffusing display light projected from the projector onto the array surface; and a display surface for diffusing the display light diffused by the screen member An optical member ( 4051) for guiding light to the side, and the optical member has an incident surface ( 4052) on which the diffused display light is directly incident from the screen member, and is a projector of the array surface Due to the projection of the display light from Virtual point on the image plane of the display image is formed (34,2034,3034) to (101), connected by a virtual plane (102) relative to the outer peripheral edge of the incident surface (4 053), they virtual Assuming a virtual space (103) surrounded by a virtual plane between the point and the outer peripheral edge, the screen member has an optical positional relationship in which the normal (104) at the virtual point on the imaging plane is located outside the virtual space ( 4 100) is established, and the screen member establishes the optical positional relationship with respect to the optical member that expands and guides the display light diffused by the screen member by the transmission action through the incident surface.

  According to the present invention, with respect to a virtual space surrounded by a virtual connection point between a virtual point on the imaging surface of the array surface of the screen member and an outer peripheral edge of the incident surface of the optical member, The normal at the virtual point is located. Under such an optical positional relationship, external light incident on the incident surface from the outside of the HUD device is guided to the screen member side inside the virtual space and reflected by the imaging surface, so that the method is performed outside the virtual space. Head in the direction of symmetry about the line. According to this, it is possible to restrict the external light reflected light on the imaging surface from returning to the incident surface through the inside of the virtual space. Therefore, the situation where the reflected light from the external light is superimposed on the display light that is directly incident on the incident surface from the image formation surface on which the display image is formed is suppressed, and the visibility of the display image displayed by the display light is increased. obtain.

  In another disclosed invention, the screen member establishes an optical positional relationship at an arbitrary virtual point in the entire imaging plane.

  According to the present invention, the optical positional relationship in which the normal of the imaging plane is located outside the virtual space is established at an arbitrary virtual point in the entire imaging plane, so that it enters the outer peripheral edge of the incident plane from the entire area. Overlap of external light reflected light can be suppressed with respect to all of the displayed light. According to this, the visibility of the display image that is displayed as a virtual image by the display light reaching the eyes of the vehicle occupant from within the outer periphery of the incident surface can be reliably improved.

It is a lineblock diagram showing the HUD device by a first embodiment. It is a schematic diagram which shows the display state by 1st embodiment. It is a perspective view which shows the screen member by 1st embodiment partially. It is a perspective view for demonstrating the optical positional relationship with respect to the optical member of the screen member by 1st embodiment. It is a front view for demonstrating the optical positional relationship with respect to the optical member of the screen member by 1st embodiment. It is an enlarged block diagram for demonstrating the optical positional relationship with respect to the optical member of the screen member by 1st embodiment. It is a block diagram which shows the HUD apparatus by 2nd embodiment. It is an enlarged block diagram for demonstrating the optical positional relationship with respect to the optical member of the screen member by 2nd embodiment. It is a block diagram which shows the HUD apparatus by 3rd embodiment. It is an enlarged block diagram for demonstrating the optical positional relationship with respect to the optical member of the screen member by 3rd embodiment. It is a block diagram which shows the HUD apparatus by 4th embodiment. It is an enlarged block diagram for demonstrating the optical positional relationship with respect to the optical member of the screen member by 4th embodiment.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other part of the configuration. In addition, not only combinations of configurations explicitly described in the description of each embodiment, but also the configurations of a plurality of embodiments can be partially combined even if they are not explicitly specified unless there is a problem with the combination. .

(First embodiment)
As shown in FIG. 1, the HUD device 1 according to the first embodiment of the present invention is mounted on a vehicle 2 as a “moving body” and is accommodated in an instrument panel 80. The HUD device 1 projects a display image 71 toward a windshield 90 that is a display member of the vehicle 2. Here, the indoor side surface of the windshield 90 in the vehicle 2 constitutes a projection surface 91 on which the display image 71 is projected above the instrument panel 80. Further, in the vehicle 2, the windshield 90 may have an angle difference for suppressing the optical path difference between the indoor side surface and the outdoor side surface, or a vapor deposition film for suppressing the optical path difference. Or what provided the film etc. in the indoor side surface may be used.

  When the display image 71 is projected onto the projection surface 91, the display light reflected by the projection surface 91 reaches the occupant's eye point 61 in the interior of the vehicle 2. The occupant can perceive the virtual image 70 of the display image 71 formed in front of the windshield 90 by perceiving the display light reaching the eye point 61. At this time, the visual recognition of the virtual image 70 is limited to the case where the eye point 61 is located in the visual recognition area 60 of the occupant. In other words, when the eye point 61 is out of the visual recognition area 60, it is difficult for the occupant to visually recognize the virtual image 70.

  The projection of the display image 71 onto the projection surface 91 causes the HUD device 1 to display a virtual image 70 of the display image 71 as shown in FIG. As the virtual image 70, for example, an instruction display 70a of the traveling speed of the vehicle 2, an instruction display 70b of the traveling direction of the vehicle 2 by the navigation system, a warning display 70c related to the vehicle 2, and the like are displayed.

  Next, a specific configuration of the HUD device 1 that realizes the display function of the virtual image 70 as described above will be described below. As shown in FIG. 1, the HUD device 1 includes a projector 10, an imaging optical system 30, and a light guide optical system 50.

  The projector 10 projects display light forming the display image 71 from the emitting unit 12. For example, the projector 10 may be a laser scanner that projects laser light using a micro electro mechanical system (MEMS), or an image display that projects visible light or laser light using a digital mirror device (DMD). It may be a system or any other system.

  The imaging optical system 30 has a screen member 31 disposed obliquely above the projector 10. The plate-like screen member 31 is formed by depositing aluminum on the surface of a resin base material or a glass base material, for example, and forms an array surface 32 facing the injection unit 12 on the surface on the projector 10 side. As shown in FIG. 3, a plurality of optical elements 33 curved in a convex shape as micromirrors are arrayed in a grid pattern in the vertical and horizontal directions on the array surface 32 formed in a rectangular shape as a whole. Here, all of the optical elements 33 may be formed as a single body, or may be formed separately and held on a common base material. As shown in FIGS. 1, 3, and 6, display light projected from the projector 10 is directly incident on at least a part of the array surface 32 including a plurality of such optical elements 33. A display image 71 is formed. In other words, in the first embodiment, a region 34 constituting a part or the whole of the array surface 32 is the imaging surface 34. The imaging surface 34 exhibits a reflection effect on the incident display light, thereby diffusing the display light toward the light guide optical system 50. In this embodiment, the width of each optical element 33 in the vertical and horizontal directions is, for example, 10 to 500 μm, and the sag amount between the apex and the boundary of each optical element 33 (in other words, the height or depth). ) Is, for example, 0.1 to 5 μm.

  As shown in FIG. 1, the light guide optical system 50 includes a magnifying mirror 51 disposed obliquely below the projection surface 91 as the optical member 51. The plate-like optical member 51 is a light reflection type formed by, for example, depositing aluminum on the surface of a resin substrate or a glass substrate, and an incident surface 52 facing the array surface 32 is formed on the surface on the screen member 31 side. ing. Therefore, the display light diffused by the screen member 31 is directly incident on the incident surface 52. As shown in FIGS. 4 to 6, the entire shape of the incident surface 52 is such that the outer peripheral edge 53 is a rectangle in the vertical and horizontal directions, and smoothly curves toward the side away from the screen member 31 in both the vertical and horizontal directions. A concave shape is employed. Due to the concave shape, the incident surface 52 guides the display light to the projection surface 91 side by exhibiting a reflection action and an enlargement action with respect to the display light incident from the imaging surface 34 of the array surface 32. . At this time, the display light is directly guided from the incident surface 52 to the projection surface 91, so that the display image 71 is projected onto the projection surface 91. Therefore, according to the display light that is enlarged by the incident surface 52 and reaches the eyes of the occupant in the viewing area 60 from the projection surface 91, the display image 71 displayed as the virtual image 70 is also enlarged.

  Next, the optical positional relationship 100 with respect to the optical member 51 of the screen member 31 will be described in detail.

  As shown in FIGS. 4 to 6, a virtual point 101, a virtual surface 102, and a virtual space 103 are defined. Specifically, the virtual point 101 is assumed as a point on the curved convex surface 35 (see FIGS. 3 and 6) of each optical element 33 constituting the imaging surface 34 in the array surface 32. The virtual surface 102 is assumed as a surface that connects the virtual point 101 to the four sides 53a, 53b, 53c, and 53d that form the outer peripheral edge 53 of the incident surface 52 of the optical member 51. That is, the virtual surface 102 is assumed as a conical surface connecting the outer peripheral edge 53 and the virtual point 101. The virtual space 103 is assumed to be a conical space by being surrounded by the virtual surface 102 between the outer peripheral edge 53 and the virtual point 101 and the incident surface 52 in the outer peripheral edge 53. The incident surface 52 is a part of the entire surface of the optical member 51 or the entire region of the optical member 51 and substantially has a light guide effect (that is, a reflection effect) toward the projection surface 91 with respect to incident display light from the imaging surface 34. The outer peripheral edge 53 means the contour of the outermost periphery of the area.

  The optical positional relationship 100 realized under the above assumption is characterized by the relationship between the normal 104 of the imaging plane 34 at the virtual point 101 and the virtual space 103 as shown in FIG. Specifically, the normal line 104 is perpendicular to the tangential plane 105 through the virtual point 101 when assuming a tangential plane 105 having the virtual point 101 as a contact point with respect to the curved convex surface 35 forming the imaging surface 34. A straight line. The optical positional relationship 100 is set so that the normal line 104 does not overlap the above-described virtual space 103, that is, is positioned outside the weight-like virtual space 103. Here, in particular, the optical positional relationship 100 of the first embodiment is a relationship in which the normal 104 of the imaging surface 34 is located outside the virtual space 103 at an arbitrary virtual point 101 in the entire region of the imaging surface 34. It is to be established. Note that the entire area of the imaging surface 34 means a part or the entire region of the array surface 32 where the display image 71 is formed by the projection display light from the projector 10.

  The effects of the first embodiment described above will be described below.

  According to the first embodiment, the virtual point 101 on the imaging surface 34 of the array surface 32 of the screen member 31 and the connection virtual surface 102 between the outer peripheral edge 53 of the incident surface 52 of the optical member 51 are surrounded. A normal line 104 at the virtual point 101 is located outside the virtual space 103. Under this optical positional relationship 100, the external light Lo incident on the incident surface 52 from outside the HUD device 1 as shown in FIG. 6 is guided to the screen member 31 side inside the virtual space 103 and reflected by the imaging surface 34. As a result, the virtual space 103 is directed toward the symmetry direction with respect to the normal 104. According to this, as shown in FIG. 6, it can be regulated that the external light reflected light Lr on the imaging surface 34 returns to the incident surface 52 through the inside of the virtual space 103. Therefore, a situation in which the external light reflected light Lr overlaps the display light directly incident on the incident surface 52 from the imaging surface 34 on which the display image 71 is formed, and the display image 71 is displayed as a virtual image by the display light. The visibility of can be improved.

  Here, in particular, the optical positional relationship 100 in which the normal 104 of the imaging plane 34 is located outside the virtual space 103 is established at an arbitrary virtual point 101 in the entire imaging plane 34, so It is possible to suppress the overlap of the external light reflected light with respect to all the display light incident into the outer peripheral edge 53. According to this, the visibility of the display image 71 displayed as a virtual image by the display light reaching the occupant's eyes from within the outer peripheral edge 53 of the incident surface 52 can be reliably improved.

  Further, the display light diffused in the screen member 31 according to the first embodiment is magnified by the reflection action on the incident surface 52 and guided to the projection surface 91 side, so that the display light reaches the eyes of the occupant. The display image 71 displayed as a virtual image is also enlarged. Therefore, by adopting the optical positional relationship 100 in which the normal line 104 of the imaging plane 34 at the virtual point 101 is located outside the virtual space 103, the external light reflected light Lr overlaps the enlarged display image 71. A situation in which visibility deteriorates due to display light can be suppressed.

  Furthermore, according to the first embodiment, the normal 104 at the virtual point 101 is located outside the virtual space 103 on the imaging plane 34 that diffuses the display light projected from the projector 10 by reflection. According to the imaging surface 34, display light diffused by reflection is incident on the incident surface 52 through the inside of the virtual space 103, and at the same time, external light Lo guided from the incident surface 52 is external to the virtual space 103. It can be reflected to. Therefore, it is possible to suppress the external light reflected light Lr from overlapping the display light incident on the incident surface 52 and to improve the visibility of the display image 71 displayed as a virtual image by the display light.

(Second embodiment)
As shown in FIGS. 7 and 8, the second embodiment of the present invention is a modification of the first embodiment. The screen member 2031 of the second embodiment is a light transmission type made of, for example, a resin plate or a glass plate. The screen member 2031 is formed with a projection surface 2036 facing the emitting portion 12 on the rear surface on the projector 10 side. At the same time, the screen member 2031 forms an array surface 2032 facing the incident surface 52 on the surface on the optical member 51 side. Here, a plurality of optical elements 33 (see FIG. 8) curved in a convex shape as microlenses are arranged in a grid pattern in the vertical and horizontal directions on the array surface 2032 formed in a rectangular shape as a whole. Display light 71 directly projected from the projector 10 onto the projection surface 2036 is incident on at least a part of the array surface 2032 including a plurality of such optical elements 33, thereby forming a display image 71. The That is, in the second embodiment, a region 2034 constituting a part or the whole of the array surface 2032 becomes the imaging surface 2034. The imaging surface 2034 exhibits a transmission effect on the incident display light, thereby diffusing the display light toward the incident surface 52. The display light that is directly incident on the incident surface 52 is enlarged and guided to the projection surface 91 side as in the first embodiment.

  As shown in FIG. 8, the optical positional relationship 2100 of the second embodiment is different from the “imaging surface 34” and the “array surface 32” in the optical positional relationship 100 of the first embodiment. ”And“ array surface 2032 ”. That is, in the optical positional relationship 2100 in which the virtual point 101 is assumed as a point on the curved convex surface 35 of each optical element 33 constituting the imaging surface 2034, a connection is made at an arbitrary virtual point 101 in the entire imaging surface 2034. The normal 104 of the image plane 2034 is located outside the virtual space 103.

  According to the second embodiment described so far, the same effects as those of the first embodiment can be obtained except for the effect due to the reflection action of the imaging surface 34. Further, according to the second embodiment, the normal 104 at the virtual point 101 is located outside the virtual space 103 on the imaging plane 2034 that diffuses the display light projected from the projector 10 by transmission. According to the imaging surface 2034, the display light diffused by the transmission action is incident on the incident surface 52 through the inside of the virtual space 103, and at the same time, the external light Lo guided from the incident surface 52 is brought out of the virtual space 103. And can be reflected. Therefore, it is possible to suppress the external light reflected light Lr from overlapping the display light incident on the incident surface 52 and to improve the visibility of the display image 71 displayed as a virtual image by the display light.

(Third embodiment)
As shown in FIGS. 9 and 10, the third embodiment of the present invention is a modification of the first and second embodiments. The screen member 3031 of the third embodiment is also a light transmission type made of, for example, a resin plate or a glass plate, but the member 3031 has an emission surface 3037 facing the incident surface 52 formed on the surface on the optical member 51 side. Yes. Accordingly, the screen member 3031 forms an array surface 3032 that faces the emitting portion 12 on the rear surface on the projector 10 side. Here, a plurality of optical elements 33 (see FIG. 10) curved in a convex shape as microlenses are arranged in a grid pattern in the vertical and horizontal directions on an array surface 3032 formed in a rectangular shape as a whole. Display light 71 directly projected from the projector 10 is incident on at least a part of the array surface 3032 including a plurality of such optical elements 33, thereby forming a display image 71. In other words, in the second embodiment, a region 3034 constituting a part or the whole of the array surface 3032 becomes the imaging surface 3034. The imaging surface 3034 exhibits a transmission effect on the incident display light, thereby diffusing the display light toward the exit surface 3037 side. By diffusing in this way, the display light that is directly incident on the incident surface 52 from the exit surface 3037 is enlarged and guided to the projection surface 91 side as in the first embodiment.

  As shown in FIG. 10, the optical positional relationship 3100 of the third embodiment is different from the “imaging surface 34” and the “array surface 32” in the optical positional relationship 100 of the first embodiment. And “array surface 3032”. That is, in the optical positional relationship 3100 in which the virtual point 101 is assumed as a point on the curved convex surface 35 of each optical element 33 constituting the imaging surface 3034, the connection is made at an arbitrary virtual point 101 in the entire imaging surface 3034. The normal 104 of the image plane 3034 is located outside the virtual space 103.

  According to the third embodiment described so far, the same effect as that of the first embodiment can be obtained except for the effect of the reflection action of the imaging surface 34, and the effect of the imaging surface 2034 of the second embodiment. Can be similarly achieved by the imaging plane 3034.

(Fourth embodiment)
As shown in FIGS. 11 and 12, the fourth embodiment of the present invention is a modification of the first embodiment. In the fourth embodiment, the magnifying lens 4051 disposed between the projection surface 91 and the screen member 31 in the vertical direction is the optical member 4051. The optical member 4051 is a light transmission type made of, for example, a resin lens or a glass lens, and an incident surface 4052 facing the array surface 32 is formed on the lens surface on the screen member 31 side. Therefore, the display light diffused by the screen member 31 is directly incident on the incident surface 4052. Here, as the entire shape of the incident surface 4052, the outer peripheral edge 4053 shown in FIG. 12 is a vertical and horizontal rectangle, and a convex shape that smoothly curves toward the approaching side from the screen member 31 in both the vertical and horizontal directions. It has been adopted. Due to the convex shape, the incident surface 4052 guides the display light to the projection surface 91 side by exhibiting a transmission effect and an enlargement effect on the display light incident from the imaging surface 34.

  As shown in FIG. 12, the optical positional relationship 4100 of the fourth embodiment is different from that of the optical positional relationship 100 of the first embodiment by “optical member 51”, “incident surface 52”, and “outer peripheral edge 53”. The relationship is read as “optical member 4051”, “incident surface 4052”, and “outer peripheral edge 4053”. That is, in the optical positional relationship 4100, the virtual space 103 surrounded by the virtual surface 102 between the outer peripheral edge 4053 and the incident surface 4052 in the outer peripheral edge 4053 at an arbitrary virtual point 101 in the entire imaging surface 34. The normal line 104 of the image plane 34 is located outside the center.

  According to the fourth embodiment described so far, the same effects as those of the first embodiment can be obtained except for the effects of the reflection action of the incident surface 52. Further, according to the fourth embodiment, the display light diffused by the screen member 31 is magnified by the transmission action through the incident surface 4052 and guided to the projection surface 91 side. The display image 71 that is displayed as a virtual image by arriving at is also enlarged. Therefore, by adopting the optical positional relationship 4100 in which the normal line 104 of the imaging plane 34 at the virtual point 101 is located outside the virtual space 103, the external light reflected light Lr overlaps the enlarged display image 71. A situation in which visibility deteriorates due to display light can be suppressed.

(Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and various embodiments and combinations can be made without departing from the scope of the present invention. Can be applied.

  In the first modification regarding the first to fourth embodiments, the relation 100, 2100, 3100, 4100 in which the normal line 104 is located outside the virtual space 103 is removed from the imaging planes 34, 2034, 3034 except for the outer peripheral edge and the like. You may establish with respect to the arbitrary virtual points 101 which can be assumed in a partial area. Moreover, in the modification 2 regarding 2nd and 3rd embodiment, the optical member 4051 which has the entrance surface 4052 which exhibits a transmission effect according to 4th embodiment is optical with the entrance surface 52 which exhibits a reflection effect. It may replace with member 51 and may be adopted. Furthermore, in the modification 3 regarding 1st and 4th embodiment, the light reflection type which contains the imaging surface 34 in the back surface on the opposite side to the surface which faces the injection | emission part 12 and the optical members 51 and 4051 among the screen members 31. FIG. The array surface 32 may be formed.

  In the modification 4 regarding the first to fourth embodiments, at least one of other optical elements such as a mirror or a lens is provided between the optical members 51 and 4051 and the projection surface 91 in the light guide optical system 50. May be. Moreover, in the modified example 5 regarding 1st-4th embodiment, in the imaging optical system 30, at least 1 of other optical elements, such as a lens, is provided in the projector 10 side rather than the screen members 31,2031,3031. May be.

  In the modification 6 regarding the first to fourth embodiments, as a display member that forms the projection surface 91 of the vehicle 2, an element other than the windshield 90, for example, a combiner attached to the indoor side surface of the windshield 90, or the wind A combiner or the like formed separately from the shield 90 may be employed. Moreover, in the modification 7 regarding 1st-4th embodiment, you may apply this invention to various moving bodies (transportation equipment), such as ships other than the vehicle 2, or an airplane.

1 HUD device, 2 vehicle, 10 projector, 31, 2031, 3031 screen member, 32, 2032, 3032 array surface, 33 optical element, 34, 2034, 3034 region / imaging surface, 35 curved convex surface, 51 magnifier Optical member, 52, 4052 incident surface, 53, 4053 outer periphery, 53a, 53b, 53c, 53d, four sides, 60 viewing area, 70 virtual image, 71 display image, 90 windshield, 91 projection surface, 100, 2100, 3100, 4100 Optical positional relationship, 101 virtual point, 102 virtual surface, 103 virtual space, 104 normal, 105 tangential plane, 2036 projection surface, 3037 exit surface, 4051 magnifying lens / optical member, Lo external light, Lr external light reflected light

Claims (4)

By projecting the display image (71) onto the projection surface (91) of the moving body (2), the virtual image (70) of the display image is displayed in a visible area (60) in the room of the moving body. A head-up display device,
A projector (10) for projecting display light for forming the display image;
A screen member (31, 31) having an array surface (32, 2032, 3032) in which a plurality of optical elements (33) are arranged in a lattice pattern and diffusing the display light projected from the projector onto the array surface. 2031, 3031),
An optical member ( 4051) for guiding the display light diffused by the screen member to the projection surface side,
The optical member has an incident surface ( 4052) on which the diffused display light is directly incident from the screen member;
A virtual point (101) on an imaging plane (34, 2034, 3034) on which the display image is formed by projection of the display light from the projector on the array plane is defined as an outer peripheral edge ( 4 053) is connected to the virtual plane (102), and a virtual space (103) surrounded by the virtual plane between the virtual points and the outer periphery is assumed.
The screen member establishes an optical positional relationship ( 4100) in which a normal line (104) at the virtual point of the imaging plane is located outside the virtual space ;
A head-up characterized in that the screen member establishes the optical positional relationship with respect to the optical member that guides the display light diffused by the screen member by enlarging and guiding the display light through the incident surface. Display device.   The head-up display device according to claim 1, wherein the screen member establishes the optical positional relationship at an arbitrary virtual point in the entire imaging plane. The head-up display according to claim 1 or 2 , wherein the screen member (31) diffuses the display light projected from the projector by a reflection action on the imaging plane (34). apparatus. The said screen member (2031, 3031) diffuses the said display light projected from the said projector by the permeation | transmission effect | action through the said image formation surface (2034, 3034), The Claim 1 or 2 characterized by the above-mentioned. Head up display device.

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