JP7279548B2 - head-up display device - Google Patents

Description

The present disclosure relates to a head-up display device that is used in a vehicle and that superimposes an image on the foreground of the vehicle for visual recognition.

Patent Document 1 discloses a display that displays a main image facing a passenger of a vehicle, a projector that displays a sub-image whose one end side is adjacent to the main image and whose other end side is located in front of the one end side, and A head-up display device is disclosed that includes a screen.

JP 2016-71051 A

In the head-up display device of Patent Document 1, there are two displays: a display for displaying an image facing the driver and a display (projector and screen) arranged along the road surface. is required, and it is assumed that the cost of parts will increase.

A summary of certain embodiments disclosed herein follows. It should be understood that these aspects are presented only to provide the reader with an overview of these particular embodiments and are not intended to limit the scope of this disclosure. Indeed, the present disclosure may encompass various aspects not described below.

The outline of the present disclosure relates to providing a head-up display device that has a display area that follows the road surface and a display area that tilts upward from the angle along the road surface while keeping costs down.

Therefore, the head-up display device according to the first embodiment described in this specification is a head-up display device that allows a viewer to visually recognize a virtual image in a virtual image display area along the longitudinal direction of the vehicle. The display surface is tilted in such a direction that the virtual image display area is along the front-rear direction of the vehicle with respect to the optical axis of the image light directed toward the viewer. and a first image for relaying the image light emitted from the display surface toward a projection target portion and displaying the virtual image in a distant area of the virtual image display area. A first region having a first optical power through which light passes and a second optical power through which a second image light for displaying the virtual image is formed in an intermediate region closer to the viewer than the distant region. and wherein the first optical power is less than the second optical power such that the focal length of the first region is longer than the focal length of the second region. and a relay optical system, the third area having a third optical power through which the third image light for displaying the virtual image passes in a neighboring area closer than the intermediate area when viewed from the viewer. and wherein the rate of change in optical power from the second region to the first region is greater than the rate of change in optical power from the third region to the second region. system.

Further, the head-up display device in the second embodiment is a head-up display device that allows a viewer to visually recognize a virtual image in a virtual image display area along the longitudinal direction of the vehicle, and is a display that emits image light that is the source of the virtual image. The display surface is arranged so as to be inclined in such a direction that the virtual image display area is along the front-rear direction of the vehicle with respect to the optical axis of the image light directed to the viewer. and a first optical system through which the first image light passes for relaying the image light emitted from the display surface toward the projection target portion and displaying the virtual image in a distant region of the virtual image display region. and a second region having a second optical power through which the second image light for displaying the virtual image passes in an intermediate region closer than the distant region as viewed from the viewer. a relay optical system configured such that the first optical power is smaller than the second optical power such that the focal length of the first region is longer than the focal length of the second region; wherein the angle of the tangential line of the virtual image display area with respect to the front-rear direction of the vehicle increases non-decreasingly, continuously or intermittently, from the vicinity of the viewer to the distance. It consists of two regions and the relay optics for adjusting the distribution of the optical power in the region between them.

Further, the head-up display device in the third embodiment is a head-up display device that allows a viewer to visually recognize a virtual image in a virtual image display area along the longitudinal direction of the vehicle, and is a display that emits image light that is the source of the virtual image. The display surface is arranged so as to be inclined in such a direction that the virtual image display area is along the front-rear direction of the vehicle with respect to the optical axis of the image light directed to the viewer. and a first optical system through which the first image light passes for relaying the image light emitted from the display surface toward the projection target portion and displaying the virtual image in a distant region of the virtual image display region. and a second region having a second optical power through which the second image light for displaying the virtual image passes in an intermediate region closer than the distant region as viewed from the viewer. a relay optical system configured such that the first optical power is smaller than the second optical power such that the focal length of the first region is longer than the focal length of the second region; The first region, the second region, and the space therebetween such that the angle of the tangent line of the virtual image display region with respect to the front-rear direction of the vehicle monotonically increases from the intermediate region toward the far region. wherein the second region is arranged such that the optical power distribution of the regions is adjusted such that the intermediate region is positioned at a distance of 20 meters or more in front of the viewer. and the relay optical system.

Further, the head-up display device in the fourth embodiment is a head-up display device that allows a viewer to visually recognize a virtual image in a virtual image display area along the longitudinal direction of the vehicle, and is a display that emits image light that is the source of the virtual image. The display surface is arranged so as to be inclined in such a direction that the virtual image display area is along the front-rear direction of the vehicle with respect to the optical axis of the image light directed to the viewer. and a first optical system through which the first image light passes for relaying the image light emitted from the display surface toward the projection target portion and displaying the virtual image in a distant region of the virtual image display region. and a second region having a second optical power through which the second image light for displaying the virtual image passes in an intermediate region closer than the distant region as viewed from the viewer. a relay optical system configured such that the first optical power is smaller than the second optical power such that the focal length of the first region is longer than the focal length of the second region; In the virtual image display area, a part of the virtual image display area is arranged below the road surface, and the other part including the distant area is arranged above the road surface.

Further, the head-up display device in the fifth embodiment is a head-up display device that allows a viewer to visually recognize a virtual image in a virtual image display area along the longitudinal direction of the vehicle, and is a display that emits image light that is the source of the virtual image. The display surface is arranged so as to be inclined in such a direction that the virtual image display area is along the front-rear direction of the vehicle with respect to the optical axis of the image light directed to the viewer. and a first optical system through which the first image light passes for relaying the image light emitted from the display surface toward the projection target portion and displaying the virtual image in a distant region of the virtual image display region. and a second region having a second optical power through which the second image light for displaying the virtual image passes in an intermediate region closer than the distant region as viewed from the viewer. a relay optical system configured such that the first optical power is smaller than the second optical power such that the focal length of the first region is longer than the focal length of the second region; The intermediate area is between the far end (110) and the near end of the virtual image display area as seen from the viewer in the longitudinal direction of the vehicle, and is arranged at the lowest position of the virtual image display area. .

1 is a diagram illustrating an application example of a head-up display device to a vehicle, according to some embodiments; FIG. FIG. 2 illustrates a configuration of a head-up display device, according to some embodiments; FIG. 10 is a diagram showing the arrangement of a relay optical system and a display surface of a comparative example; FIG. 3B is a diagram showing the arrangement of virtual image display areas generated in the comparative example of FIG. 3A; FIG. 4 illustrates the arrangement of relay optics and display surface, according to some embodiments. 4B is a diagram showing the arrangement of virtual image display areas generated in the embodiment of FIG. 4A; FIG. FIG. 10 is a diagram showing the relationship between the position of the virtual image display area in the depth direction (Z-axis direction) and the tilt angle, according to some embodiments; FIG. 10 is a diagram showing the relationship between the position of the virtual image display area in the depth direction (Z-axis direction) and the tilt angle, according to some embodiments; FIG. 10 is a diagram showing the relationship between the position of the virtual image display area in the depth direction (Z-axis direction) and the tilt angle, according to some embodiments; FIG. 10 is a diagram showing the relationship between the position of the virtual image display area in the depth direction (Z-axis direction) and the tilt angle, according to some embodiments; FIG. 10 is a diagram showing the relationship between the position of the virtual image display area in the depth direction (Z-axis direction) and the tilt angle, according to some embodiments; FIG. 4 is a diagram illustrating placement of virtual image display areas, according to some embodiments. FIG. 4 is a diagram illustrating placement of virtual image display areas, according to some embodiments. FIG. 4 is a diagram illustrating placement of virtual image display areas, according to some embodiments.

Below, FIGS. 1 and 2 provide a description of an exemplary vehicular display system and head-up display device configuration. 3A and 3B provide a description of a comparative example, and FIGS. 4A to 7B provide a description of the configuration of this embodiment. In addition, the present invention is not limited by the following embodiments (including the contents of the drawings). Of course, modifications (including deletion of constituent elements) can be added to the following embodiments. In addition, in the following description, descriptions of known technical matters are omitted as appropriate in order to facilitate understanding of the present invention.

Please refer to FIG. The vehicle display system 10 includes a HUD device 20 and a display control device 30 that controls the HUD device 20 . In the description of the present embodiment, when the viewer (driver 4) sitting in the driver's seat of the vehicle 1 faces the front of the vehicle 1, the horizontal direction is the X axis (the left direction is the positive direction of the X axis), and the vertical direction is Let the direction be the Y-axis (the upward direction is the Y-axis positive direction), and the front-rear direction be the Z-axis (the forward direction is the Z-axis positive direction).

The HUD device 20 in the vehicle display system 10 is a head-up display (HUD: Head-Up Display) device provided in the dashboard 5 of the vehicle 1 . The HUD device 20 emits the image light 40 toward the front windshield 2 (an example of the projected portion), and the image light 40 reflected by the front windshield 2 forms an eyebox (not shown) in a predetermined area. Generate. The driver 4 can visually recognize the entire image displayed by the HUD device 20 by arranging the eye point in the eye box. Here, the eyebox is defined as an area where the entire image can be seen, but is not limited to this, and is an area where the distortion of the image displayed by the HUD device 20 viewed by the viewer is within a predetermined threshold. , etc., in which an image displayed by the HUD device 20 is viewed in a desired state. An image (virtual image) is visually recognized in a virtual image display area 100 on the front side (positive direction of the Z-axis) of the front windshield 2 (which is an example of a projected portion). Thereby, the driver 4 can visually recognize the image (virtual image) superimposed on the foreground 300 which is the real space visually recognized through the front windshield 2 .

The vehicle display system 10 (HUD device 20) of the present embodiment forms the virtual image display area 100 along the road surface 310 (an example of the foreground 300). Specifically, in the virtual image display area 100 along the road surface 310, the distance 100Z in the depth direction (Z-axis direction) between the far end 110 and the near end 130 of the virtual image display area 100 is Indicates that the distance 100Y in the height direction (Y-axis direction) between the highest position 150 and the lowest position 160 is 20 times or longer, and more preferably, the distance 100Z in the depth direction (Z-axis direction) is , 40 times or longer than the distance 100Y in the height direction (Y-axis direction). In the virtual image display area 100 of the embodiment, (Z-coordinate [meter], Y-coordinate [meter]), and the center of the eyebox in the height direction is (0, 1.2), the near end 130 is (14.5, 0.0) and the far end 110 (highest position 150) is (53.4, 1.48) the distance between the far end 110 and the near end 130 as viewed by the driver 4 from the center of said eyebox. and the center is (27.3, 0.15). .48 [meter], and the distance 100Z in the depth direction (Z-axis direction) is 26 times the distance 100Y in the height direction (Y-axis direction). The virtual image display area 100 is a curved or partially curved area on which an image generated inside the HUD device 20 is formed as a virtual image, and is also called an imaging plane. The virtual image display area 100 is a position where a virtual image is formed on a display surface (screen 24) of the HUD device 20, which will be described later. It can be said that the virtual image visually recognized in the display area 100 corresponds to the image displayed on the display surface of the HUD device 20, which will be described later. It is preferable that the virtual image display area 100 itself has low visibility to the extent that it is not actually visually recognized by the driver 4 or is difficult to be visually recognized by the driver 4 .

FIG. 2 is a diagram showing the configuration of the HUD device 20 of this embodiment. The HUD device 20 includes a display 21 having a display surface for displaying images, and a relay optical system 25 .

The display device 21 in FIG. 2 includes a projector 22 (an example of an image generation unit) and a screen 24 (an example of a display surface) that receives projection light from the projector 22 and displays an image (real image). It is a projection type display. The display device 21 may be a transmissive display (an example of an image generator) such as an LCD that transmits light from a backlight, or may be a self-luminous display (an example of the image generator). . In these cases, the display surface is the display surface (an example of the display surface) in the transmissive display and the screen 24 (an example of the display surface) of the projection display. The display surface is perpendicular to the optical axis 40p of the image light 40 that travels from the display surface to the eyebox (the center of the eyebox) via the relay optical system 25 and the projection target section, which will be described later. The virtual image display area 100 can be arranged along the road surface 310 . The display 21 may be attached with an actuator (not shown) such as a motor controlled by the display control device 30 so that the display surface can be moved and/or rotated.

The relay optical system 25 is located on the optical path of the image light from the display 21 (light from the display 21 toward the eyebox) between the display 21 and the front windshield 2 (an example of the projected portion). , and consists of one or more optical members that project the light of the image from the display 21 onto the front windshield 2 outside the HUD device 20 . The relay optical system 25 of FIG. 2 includes one concave first mirror 26 and one planar second mirror 28 .

The first mirror 26 has a free-form curved surface whose radius of curvature gradually changes from one end to the other end. In other words, the first mirror 26 has a curved surface shape with different optical power for each region, that is, the optical power added to the image light 40 differs depending on the region (optical path) through which the image light 40 passes. Specifically, the first image light 41, the second image light 42, and the third image light 43 (see FIG. 2) traveling from each region of the display surface to the eyebox are added by the relay optical system 25. Different optical power.

The second mirror 28 may be a curved surface having optical power instead of a flat surface. That is, the relay optical system 25 is added according to the area (optical path) through which the image light 40 passes by synthesizing a plurality of mirrors (for example, the first mirror 26 and the second mirror 28 of the present embodiment). Different optical powers may be used.

It should be noted that in this embodiment, the relay optical system 25 includes two mirrors, but is not limited to this, and may additionally or alternatively include one or more refractive optics such as lenses. It may comprise a member, a diffractive optical member such as a hologram, a reflective optical member, or a combination thereof.

Further, the relay optical system 25 of the present embodiment has a function of setting a distance to a position where a virtual image is formed (virtual image display area 100) and a screen by this curved surface shape (an example of an optical power parameter ). 24 (display surface) to generate a virtual image by enlarging the image displayed on the front windshield 2. In addition to this, it has a function of suppressing (correcting) the distortion of the virtual image that may occur due to the curved shape of the front windshield 2. may have

Also, the relay optical system 25 may be attached with an actuator (not shown) such as a motor controlled by the display control device 30 so as to be movable and/or rotatable.

Next, the arrangement of the relay optical system 25 and the display surface 24 having different radii of curvature for each area and the arrangement of the generated virtual image display area 100 according to the present embodiment will be described. The virtual image display area 100 of this embodiment is formed along the road surface 310 so that the far side slopes upward.

First, a comparative example will be described with reference to FIGS. 3A and 3B. FIG. 3A is a diagram showing the arrangement of the relay optical system 500 and the display surface 524 of the comparative example. In FIG. 3A, the focal points of the regions 501, 502, and 503 of the relay optical system 500 are indicated by reference numerals 501f, 502f, and 503f for easy understanding of the difference from the present embodiment. The distance relationship between 503f and the relay optical system 500 and the distance relationship between the focal points 501f, 502f, 503f and the display surface 524 are not shown accurately. In the comparative example, the relay optical system 500 does not have different radii of curvature for each region. That is, the areas 501, 502, 503 of the relay optical system 500 through which the image lights 541, 542, 543 from the areas M1, M2, M3 of the display surface 524 pass have the same optical power. Also in the embodiment of the present invention described below, the display surface 524 is arranged at an angle α from a vertical plane 524a to the optical axis 540p of the image light directed from the display surface 524 to the eyebox. Specifically, the display surface 524 is such that a region M1 of the display surface 524 corresponding to the virtual image display region on the far side as seen from the viewer is separated from the relay optical system 500 compared to the vertical surface 524a, and is visible from the viewer. A region M3 of the display surface 524 corresponding to the virtual image display region on the near side is arranged so as to approach the relay optical system 500 . In such a case, as shown in FIG. 3B, when viewed from the left-right direction (X direction) of the vehicle 1, the generated virtual image display area 550 has a convex shape toward the driver 4 side (upper side (Y-axis positive direction)). becomes.

Next, this embodiment will be described with reference to FIGS. 4A and 4B. FIG. 4A is a diagram showing the arrangement of the relay optical system 25 and the display surface 24 of this embodiment. In FIG. 4A, in order to make it easier to understand the difference from the comparative example, the focal points of the regions 251, 252, and 253 of the relay optical system 25 are denoted by reference numerals 251f, 252f, and 253f. It does not show the distance relationship with the surface 24 accurately. The display surface 24 of this embodiment is arranged at an angle α from a vertical plane 24a to the optical axis 40p of the image light 40 directed from the display surface 24 toward the eyebox. Specifically, the display surface 24 has a region 241 corresponding to the distant region 101 (see FIG. 4B) of the virtual image display region 100 as viewed from the viewer, compared to the vertical surface 24a. A region 242 of the display surface 24 corresponding to the intermediate region 102 (see FIG. 4B) that is farther from the virtual image display region 100 than the far region 101 of the virtual image display region 100 (see FIG. 4B) is arranged so as to approach the relay optical system 25 . The relay optical system 25 of this embodiment has different radii of curvature for each region. Specifically, the first optical path 251 of the relay optical system 25 through which the first image light 41 displaying the virtual image in the distant area 101 of the virtual image display area 100 as seen from the driver 4 passes. The power of the second region (second optical path) 252 of the relay optical system 25 through which the second image light 42 that displays the virtual image in the intermediate region 102 closer than the distant region 101 of the virtual image display region 100 when viewed from the driver 4 passes. It is smaller than the second optical power. That is, when the main optical power of the relay optical system 25 is caused by the first mirror 26, which is a concave mirror, the first radius of curvature of the first region 251 reflecting the first image light 41 ( the parameter of the first optical power is ) is made larger than the second radius of curvature (an example of the parameter of the second optical power) of the second region 252 that reflects the second image light 42 . As the first radius of curvature of the first region 251 reflecting the first image light 41 increases, the focal length (1/2 of the radius of curvature) of the focal point 251f of the first region 251 increases.

Here, the following relational expression holds between the distance a (>0) between the object and the concave mirror, the distance b (>0) between the virtual image and the concave mirror, and the focal length f (>a) of the concave mirror. . According to this relational expression, the larger the radius of curvature of the concave mirror (the smaller the curvature of the mirror), the longer the focal length of the concave mirror, and the longer the focal length, the shorter the distance b of the virtual image.
1/a-1/b=1/f

As described above, by arranging the display surface 24 at an angle from the optical axis 40p of the image light directed from the display surface 24 to the eyebox, the virtual image display area 100 is arranged along the road surface 310 (from the vicinity). are arranged so that the imaging distance gradually increases toward the distance). The first image light 41 projected from the display surface 24 onto the first region 251 having a large radius of curvature of the first mirror 26 has a long focal length (the distance from the first region 251 to the focal point 251f). When reflected, the imaging distance from the front windshield 2 is reduced (compared to the case where the radius of curvature is not increased).

The relay optical system 25 of the present embodiment gradually reduces the optical power (gradually increases the radius of curvature) as the virtual image displayed by the passing image light is farther away. The far region 101 (far end 110 ) of the road surface 310 can be curved to rise from the slope along the road surface 310 . The far area 101 (far end 110) is curved so as to rise from the inclination along the road surface 310, as shown in FIG. 4B, the tilt angle θ ( The first tilt angle θ1) is larger than the tilt angle θ (second tilt angle θ2) between the tangent line of the virtual image display region 100 and the road surface 310 in the intermediate region 102 closer to the driver 4 than the far region 101, and θ continuously increases (increases monotonously) from the intermediate region 102 (near side) toward the far region 101 (distant side).

5A to 5E are diagrams showing the relationship between the position of the virtual image display area 100 in the depth direction (Z-axis direction) and the tilt angle θ according to the embodiment. In the present embodiment, the far region 101 (far end 110) should rise from the intermediate region 102 nearer to the far region 101 from the inclination along the road surface 310, and as shown in FIG. The tilt angle θ is not limited to increasing monotonically as the tilt angle increases.

That is, in some embodiments, as shown in FIG. 5B, the rate of increase (rate of change) in tilt angle θ from proximal end 130 to intermediate region 102 is equal to the tilt angle θ from intermediate region 102 to distal end 110. It may be smaller than the rate of increase (rate of change). In this case, the relay optical system 25 converts the third optical power of the third area 253 of the relay optical system 25 through which the third image light 43 corresponding to the virtual image of the near area 103 passes to the third optical power corresponding to the virtual image of the intermediate area 102 . The reduction rate (change rate) from the second optical power of the second region 252 of the relay optical system 25 through which the image light 42 passes to the second optical power corresponds to the virtual image of the far region 101. is smaller than the rate of decrease (rate of change) up to the first optical power of the first region 251 of the relay optical system 25 through which the first image light 41 passes. As a result, it is possible to suppress the change in the distance between the virtual image display area on the near side and the road surface as the distance in the depth direction increases.

Also, in some embodiments, as shown in FIG. 5C, the rate of increase (rate of change) of tilt angle θ from proximal end 130 to intermediate region 102 is zero, and the tilt angle from intermediate region 102 to distal end 110 is The rate of increase (rate of change) of θ may be greater than zero. That is, the angle (tilt angle θ) between the tangent line of the virtual image display area 100 and the front, rear, left, and right direction (XZ plane) of the vehicle 1 increases from near to far (towards the positive Z-axis direction). The rate of increase (rate of change) is not limited to monotonically increasing, and the rate of increase (rate of change) may be zero in part. may increase continuously or intermittently (broadly monotonically increasing (monotonically non-decreasing)). In this case, the relay optical system 25 changes the rate of decrease (change rate) of the optical power from the third area 253 to the second area 252 to the road surface 310 from the near area 103 to the intermediate area 102 of the virtual image display area 100 . Decrease in optical power from the second region 252 to the first region 251 of the relay optical system 25 through which the first image light 41 corresponding to the virtual image of the far region 101 passes, while adjusting the tilt angle θ to be maintained. The rate (rate of change) may be smaller than the rate of decrease (rate of change) of optical power from the third region 253 to the second region 252 . As a result, the change in the distance between the near-side virtual image display area and the road surface and the change in the tilt angle of the near-side virtual image display area due to the increase in the distance in the depth direction can be suppressed.

Also, as an alternative to FIG. 5C, some embodiments maintain the tilt angle .theta. to the far end 110 may be greater than zero. As a result, it is possible to improve the superimposition of the near-side virtual image display area and the road surface as the distance in the depth direction increases.

Also, in some embodiments, the rate of change of tilt angle θ from near region 103 to intermediate region 102 is gradually increased from a negative value to zero, and from intermediate region 102 to far end 110 , as shown in FIG. 5E. The rate of increase (rate of change) of the tilt angle .theta. FIG. 6 shows the arrangement of the virtual image display area 100 in this case. That is, the position of the virtual image display area 100 gradually decreases from the near area 103 to the intermediate area 102 in the vertical direction (Y-axis direction). The position in the vertical direction (Y-axis direction) becomes higher, and the proximal end 130 is the highest position 150 . In this case, the inclination .alpha. to the second region 252 of the relay optical system 25 through which the second image light 42 corresponding to the virtual image of the intermediate region 102 passes, from the second region 252 to the far region 101 It may be smaller than the reduction rate (change rate) of the optical power up to the first region 251 of the relay optical system 25 through which the first image light 41 corresponding to the virtual image passes. As a result, it is possible to suppress the change in the distance between the virtual image display area on the near side and the road surface as the distance in the depth direction increases.

In some embodiments, a portion of the virtual image display area 100 including the lowest position 160 is placed below the road surface 310, and a portion of the virtual image display area 100 including the far end 110 is placed above the road surface. You may For example, as shown in FIG. 7A, the virtual image display area 100 has the near end 130 at the lowest position 160, and the distance from the near end 130 to the far end 110 is placed under the road surface 310. , may be arranged on the road surface 310 . Also, the virtual image display area 100 may have a lowest position 160 at an intermediate area 102 between the far end 110 and the near end 130, as shown in FIG. 7B. The sense of incongruity when the virtual image is displayed shifted to the front side with respect to the road surface as viewed from the viewer is greater than the sense of discomfort when the image is displayed shifted to the back side with respect to the road surface. Therefore, even if the angle of the vehicle 1 changes, the placement of the virtual image display area 100 above the road surface 310 can be suppressed. , the distance in the height direction between the image on the neighboring side and the road surface 310 can be kept small.

Further, in some embodiments, the first region 251 and the second region are arranged such that the angle θ of the tangent line of the virtual image display region 100 with respect to the front-rear direction of the vehicle 1 monotonically increases from the intermediate region 102 toward the far region 101 . 252, and the distribution of the optical power in the area between them, such that the intermediate area 102 is located at a distance of 20 meters or more in front of the viewer 7 (vehicle 1). A second region 252 may be arranged in the system 25 . According to this, in the virtual image display area 100, the angle θ of the tangential line of the virtual image display area 100 with respect to the front-rear direction of the vehicle 1 monotonically increases as it goes from a distance of 20 meters or more in the front direction of the vehicle 1 toward the far side. and rises from an angle along the road surface 310 . The inventors of the present invention have recognized that the sense of distance (sense of distance) for objects that are more than 20 meters away from the viewer becomes dull. That is, even if the distance between the virtual image display area and the road surface is monotonically increased from a position 20 meters or more away from the viewer, it is difficult for the viewer to perceive the difference in distance between the virtual image display surface and the road surface (20 meters It is easy to perceive that it is displayed along the road surface like the image displayed in the virtual image display area below), and the virtual image display area on the far side is curved so that it rises from the angle along the road surface to the viewer side By doing so, the virtual image display surface on the far side as seen from the viewer can be superimposed on the wide foreground (for example, the road surface) area. In other words, the area of the foreground (for example, the road surface) that overlaps per unit area of the virtual image display area can be increased, and the images can be efficiently superimposed and displayed on the wide foreground.

1: Vehicle 2: Front windshield (projected part)
4: Driver 5: Dashboard 10: Vehicle display system 20: HUD device 21: Display device 22: Projector 24: Screen (display surface)
24a: vertical surface 25: relay optical system 26: first mirror 28: second mirror 30: display control device 40: image light 40p: optical axis 41: first image light 42: second image light 43: third image light 100 : virtual image display region 101 : distant region 102 : intermediate region 103 : near region 110 : far end 130 : near end 150 : highest position 160 : lowest position 241 : region 242 : region 251 : first region 252 : second region 253 : Third area 310 : Road surface α : Angle θ : Tilt angle

Claims (6)

A head-up display device (20) that allows a viewer to visually recognize a virtual image in a virtual image display area (100) along the longitudinal direction of the vehicle,
Having a display surface (24) for emitting image light (40) that is the source of the virtual image,
The display surface (24) is inclined with respect to the optical axis (40p) of the image light (40) directed to the viewer in such a direction that the virtual image display area (100) is along the longitudinal direction of the vehicle. an indicator (21) arranged to:
relaying the image light (40) emitted by the display surface (24) toward the projection target (2);
a first area (251) having a first optical power through which a first image light (41) for displaying the virtual image passes in a distant area (101) of the virtual image display area (100);
A second area (252) having a second optical power through which a second image light (42) for displaying the virtual image passes in an intermediate area (102) closer than the far area (101) when viewed from the viewer. and
A relay optical system configured such that the first optical power is smaller than the second optical power so that the focal length of the first region (251) is longer than the focal length of the second region (252). (25) and
A third area (253) having a third optical power through which a third image light (43) for displaying the virtual image passes in a neighboring area (103) closer than the intermediate area (102) when viewed from the viewer. , further including
The rate of change in optical power from said second region (252) to said first region (251) is greater than the rate of change in optical power from said third region (253) to said second region (252). said relay optics (25) configured to:
A head-up display device comprising : A head-up display device (20) that allows a viewer to visually recognize a virtual image in a virtual image display area (100) along the longitudinal direction of the vehicle,
Having a display surface (24) for emitting image light (40) that is the source of the virtual image,
The display surface (24) is inclined with respect to the optical axis (40p) of the image light (40) directed to the viewer in such a direction that the virtual image display area (100) is along the longitudinal direction of the vehicle. an indicator (21) arranged to:
relaying the image light (40) emitted by the display surface (24) toward the projection target (2);
a first area (251) having a first optical power through which a first image light (41) for displaying the virtual image passes in a distant area (101) of the virtual image display area (100);
A second area (252) having a second optical power through which a second image light (42) for displaying the virtual image passes in an intermediate area (102) closer than the far area (101) when viewed from the viewer. and
A relay optical system configured such that the first optical power is smaller than the second optical power so that the focal length of the first region (251) is longer than the focal length of the second region (252). (25) and
The first region is such that an angle (θ) of a tangent line of the virtual image display region (100) with respect to the front-rear direction of the vehicle increases non-decreasingly and continuously or intermittently as it goes away from the vicinity of the viewer. (251), the relay optics (25) for adjusting the distribution of the optical power in the second region (252) and regions therebetween;
A head-up display device comprising : A head-up display device (20) that allows a viewer to visually recognize a virtual image in a virtual image display area (100) along the longitudinal direction of the vehicle,
Having a display surface (24) for emitting image light (40) that is the source of the virtual image,
The display surface (24) is inclined with respect to the optical axis (40p) of the image light (40) directed to the viewer in such a direction that the virtual image display area (100) is along the longitudinal direction of the vehicle. an indicator (21) arranged to:
relaying the image light (40) emitted by the display surface (24) toward the projection target (2);
a first area (251) having a first optical power through which a first image light (41) for displaying the virtual image passes in a distant area (101) of the virtual image display area (100);
A second area (252) having a second optical power through which a second image light (42) for displaying the virtual image passes in an intermediate area (102) closer than the far area (101) when viewed from the viewer. and
A relay optical system configured such that the first optical power is smaller than the second optical power so that the focal length of the first region (251) is longer than the focal length of the second region (252). (25) and
The first region (251 ), the second region (252), and adjusting the distribution of the optical power in regions therebetween;
The relay optics configured such that the second region (252) is positioned such that the intermediate region (102) is positioned at a distance of 20 meters or more in front of the viewer. (25), a head-up display device comprising : A head-up display device (20) that allows a viewer to visually recognize a virtual image in a virtual image display area (100) along the longitudinal direction of the vehicle,
Having a display surface (24) for emitting image light (40) that is the source of the virtual image,
The display surface (24) is inclined with respect to the optical axis (40p) of the image light (40) directed to the viewer in such a direction that the virtual image display area (100) is along the longitudinal direction of the vehicle. an indicator (21) arranged to:
relaying the image light (40) emitted by the display surface (24) toward the projection target (2);
a first area (251) having a first optical power through which a first image light (41) for displaying the virtual image passes in a distant area (101) of the virtual image display area (100);
A second area (252) having a second optical power through which a second image light (42) for displaying the virtual image passes in an intermediate area (102) closer than the far area (101) when viewed from the viewer. and
A relay optical system configured such that the first optical power is smaller than the second optical power so that the focal length of the first region (251) is longer than the focal length of the second region (252). (25) and
The virtual image display area (100) is configured such that a part of the virtual image display area (100) is arranged below the road surface (310) and the other part including the distant area (101) is arranged above the road surface (310). place ,
Head-up display device. A head-up display device (20) that allows a viewer to visually recognize a virtual image in a virtual image display area (100) along the longitudinal direction of the vehicle,
Having a display surface (24) for emitting image light (40) that is the source of the virtual image,
The display surface (24) is inclined with respect to the optical axis (40p) of the image light (40) directed to the viewer in such a direction that the virtual image display area (100) is along the longitudinal direction of the vehicle. an indicator (21) arranged to:
relaying the image light (40) emitted by the display surface (24) toward the projection target (2);
a first area (251) having a first optical power through which a first image light (41) for displaying the virtual image passes in a distant area (101) of the virtual image display area (100);
A second area (252) having a second optical power through which a second image light (42) for displaying the virtual image passes in an intermediate area (102) closer than the far area (101) when viewed from the viewer. and
A relay optical system configured such that the first optical power is smaller than the second optical power so that the focal length of the first region (251) is longer than the focal length of the second region (252). (25) and
The intermediate area (102) is between a far end (110) and a near end (130) of the virtual image display area (100) seen from the viewer in the front-rear direction of the vehicle, and the virtual image display area ( 100) placed at the lowest position ,
Head-up display device. In the virtual image display area (100), a part of the virtual image display area (100) including the intermediate area (102) is arranged below a road surface (310), and the other part including the far area (101) is arranged below the road surface (310). Placed above the road surface (310),
The head-up display device according to claim 5.

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