JP2023161904A - Vehicle virtual image display device - Google Patents

Abstract

An object of the present invention is to provide a virtual image display device for a vehicle that can display an appropriate image in a superimposed manner on the foreground without obstructing the driver's field of view. SOLUTION: A liquid crystal display 121 that emits image display light, a plane mirror 130 and a concave mirror 140 that reflect the display light and project it onto a windshield 10 located in front of a viewer, and controls the operation of the display unit. A virtual image display device for a vehicle includes a control unit 150 and displays an image as a virtual image 20 in front of a viewer, wherein the control unit controls in advance an intermediate area 20a3 of a virtual image area 20a in which the virtual image is displayed. a determination unit 151 that determines whether or not the area of each divided virtual image, when divided by a plurality of predetermined reference figures S, satisfies a condition that the area of each divided virtual image is equal to or less than a predetermined ratio with respect to the area of the reference figure; , a conversion unit 152 that converts the image based on a predetermined conversion pattern so that the condition is satisfied when the condition is not satisfied. [Selection diagram] Figure 1

Description

The present disclosure relates to a virtual image display device for a vehicle.

As a driving support information display system, for example, one described in Patent Document 1 is known. In the driving support information display system of Patent Document 1, a display area is provided in the front window of the vehicle, and the information (display image) displayed in the display area can be visually recognized as a virtual image superimposed on the scenery in front of the vehicle. It is now possible to do so. As a display for driving assistance (desired destination guidance), an arrow indicating the direction in which the vehicle should travel is displayed in the display area. The display form of the arrow is dynamically changed depending on the driving state of the vehicle and the traffic conditions around the vehicle. The display form of the arrow can be changed, for example, in the display position, color, transparency, movement, shape, size, etc.

This makes it possible to add information for safe driving to the driving support information indicating the direction in which the vehicle should travel. As a result, the driver is able to grasp the direction in which the vehicle should travel without significantly moving his or her line of sight, and can intuitively drive safely by referring to changes in the display format of the graphics in the video. Information can now be obtained.

JP2006-284458A

In virtual image display devices for vehicles, in order to prevent the displayed virtual image from obstructing the driver's view, the Japan Automobile Manufacturers Association's voluntary regulations require that the image be displayed in the center area in the vertical direction of the area in which the virtual image is displayed. Previously, this was not allowed, but with the revision of the self-imposed regulations, it has become possible to display images in the central area under certain conditions. The condition for display is that when the central region is divided by reference figures with a predetermined area, the divided virtual image in any part does not exceed a predetermined proportion of each reference figure. .

Here, for example, if you want to display a virtual image so that it is superimposed on the actual foreground in real time, it is difficult to prepare such a virtual image (display image) in advance, and a virtual image that does not meet the above self-regulations is not a virtual image. This results in an undesirable display image on the display device.

In view of the above problems, an object of the present disclosure is to provide a virtual image display device for a vehicle that can display an appropriate image without obstructing the driver's field of view when superimposing the image on the foreground.

The present disclosure employs the following technical means to achieve the above object.

In the present disclosure, a display unit (121) that emits image display light;
a reflecting section (130, 140) that reflects the display light and projects it onto a projection member (10) located in front of the viewer;
A control unit (150) that controls the operation of the display unit,
A virtual image display device for a vehicle that displays an image to a viewer as a virtual image (20) in front of a projection member,
The control section is
When the area (20a3) on the center side in the vertical direction of the display area (20a) in which the virtual image is displayed is divided by a plurality of predetermined reference figures (S), the area of each divided virtual image a determination unit (151) that determines whether or not the area of the reference figure satisfies a condition of being less than or equal to a predetermined ratio with respect to the area of the reference figure;
The image forming apparatus includes a converting unit (152) that converts the image based on a predetermined conversion pattern so that the condition is satisfied when the condition is not satisfied.

According to the present disclosure, the determination unit determines the condition regarding the area ratio of the virtual image displayed in the center side of the display area to the reference figure, and when the condition is not satisfied, the conversion unit Convert the image to satisfy. Therefore, even when a virtual image is displayed superimposed on the foreground, the visual field of the viewer is not obstructed by the virtual image in the central display area.

It is an explanatory view showing the whole composition of a virtual image display device for vehicles. It is an explanatory view showing a line of 3 degrees upward and a line of 1 degree downward. FIG. 3 is an explanatory diagram showing an area where a virtual image is displayed. FIG. 6 is an explanatory diagram showing a case where a virtual image is displayed in an intermediate area. It is an explanatory view showing a case where a virtual image straddles a lower area and an intermediate area. FIG. 2 is an explanatory diagram showing an area occupied by a virtual image. It is an explanatory view showing an image of an arrow of a 1st embodiment. 7 is an explanatory diagram showing an image of an arrow in Modification 1. FIG. FIG. 7 is an explanatory diagram showing an image of an arrow in Modification 2. FIG. FIG. 7 is an explanatory diagram showing an image of an arrow in Modification 3; FIG. 12 is an explanatory diagram showing an image of an arrow in Modification 4. FIG. 12 is an explanatory diagram showing an image of an arrow in Modification 5. FIG.

Hereinafter, a plurality of embodiments for carrying out the present disclosure will be described with reference to the drawings. In each form, parts corresponding to matters explained in the preceding form may be given the same reference numerals and redundant explanation may be omitted. When only a part of the configuration is described in each form, the other forms previously described can be applied to other parts of the structure. Not only combinations of parts that specifically indicate that combinations are possible in each embodiment, but also partial combinations of embodiments even if it is not explicitly stated, as long as there is no particular problem with the combination. It is also possible.

(First embodiment)
A virtual image display device for a vehicle according to a first embodiment will be explained based on FIGS. 1 to 7. As shown in FIG. 1, the vehicular virtual image display device is a device that projects an image of a display device 120 (liquid crystal display 121) onto a windshield 10 as a projection member in front of a driver of a vehicle 1.

That is, the virtual image display device for a vehicle projects display light representing an image (solid arrow in FIG. 1) emitted from the display device 120 onto the projection position 10a of the windshield 10 of the vehicle 1. Then, the vehicle virtual image display device superimposes and displays a virtual image 20 on the forward extension of the vehicle 1 (in front of the windshield 10 = foreground) of the line connecting the driver (viewer) and the projection position 10a, and displays the virtual image 20 while driving. It is made visible to the public. Such a virtual image display device for a vehicle is called a head-up display device, and hereinafter referred to as “HUD device 100”.

In this embodiment, for example, the HUD device 100 performs AR (Augmented Reality) display in the middle region 20a3 of the virtual image region 20a (FIG. 3) in which the virtual image 20 is displayed, and displays AR (Augmented Reality) in the lower region 20a2. A fixed form display (non-AR display) is performed. The AR display displays a virtual image 20 superimposed on objects to be superimposed in the driver's foreground, such as other vehicles, pedestrians, cyclists, a driving route, and the like. The superimposed virtual image 20 is, for example, an image of an arrow (arrow images 25a to 25f to be described later) that indicates the direction in which to proceed with respect to the travel route (foreground) when providing destination guidance using the satellite positioning system 51. It becomes.

Note that the windshield 10 is a shield on the front side of the vehicle 1, and uses, for example, a laminated glass formed from two pieces of glass and an interlayer film provided in between. The windshield 10 has a curvature such that the interior side of the vehicle 1 is a concave surface when viewed from above the vehicle 1 and from the side of the vehicle 1, and has the same effect as a concave mirror to improve the display image. It is now possible to enlarge the image and display it further away.

The HUD device 100 includes a housing 110, a display device 120, a reflecting section (a plane mirror 130, a concave mirror 140), a control section 150, and the like. In addition, various signals (information) detected by a satellite positioning system 51 (GNSS), a front camera 52, a vehicle ECU 53, etc. mounted on the vehicle 1 are input to the control unit 150 via a communication bus 60. It looks like this.

The satellite positioning system 51 is mounted on the vehicle 1, and determines the current position PL, traveling direction DT, etc. of the vehicle 1 by receiving navigation signals transmitted from positioning satellites that constitute a GNSS (Global Navigation Satellite System). This is a device that is detected sequentially. For example, if the satellite positioning system 51 is able to receive navigation signals from four or more positioning satellites, it outputs positioning results every 100 milliseconds. As the satellite positioning system 51, GPS, GLONASS, Galileo, IRNSS, QZSS, Beidou, etc. can be adopted. As the satellite positioning system 51, for example, one applied to the navigation device of the vehicle 1 can be used.

The front camera 52 is provided, for example, in front of the ceiling in the vehicle interior, and outputs data of a front image FI that captures the foreground (front area) of the vehicle 1 as detection information. As the front camera 52, for example, a CCD camera, a CMOS camera, an infrared camera, or the like is used.

The vehicle ECU 53 is a control means that controls the operation of various functional parts in the vehicle 1, and outputs various vehicle information VI used for control. The vehicle information VI includes, for example, gear information indicating the gear selected in the transmission, vehicle speed information, and the like.

Next, in the HUD device 100, the casing 110 is a case member that houses the display device 120, the reflecting section (plane mirror 130, concave mirror 140), the control section 150, etc., and has a rectangular parallelepiped shape, for example. . An opening 111 is formed on the upper side of the housing 110 (on the windshield 10 side) so that display light from the display device 120 can be emitted (passed through). A translucent dustproof sheet is provided in the opening 111 to prevent dirt, dust, etc. from entering the housing 110. The housing 110 is arranged within the instrument panel of the vehicle 1. Note that an instrument panel opening through which display light passes is also formed on the upper surface of the instrument panel.

The display device 120 includes a liquid crystal display 121, a backlight 122, and the like.

The liquid crystal display 121 is illuminated by light from a backlight 122 to display a predetermined image on a display surface 121a, and is drive-controlled (image processed) by a control unit 150. The liquid crystal display 121 is, for example, a TFT liquid crystal display using a thin film transistor (TFT). The liquid crystal display 121 corresponds to the display section of the present disclosure.

The backlight 122 is disposed on the back side of the liquid crystal display 121 (on the opposite side of the display surface 121a), and emits light when energized (supplied with power) to provide light for displaying images to the liquid crystal display 121. It serves as a light source for illumination. The backlight 122 uses, for example, a light emitting diode (LED). A plurality of light emitting diodes are provided and arranged in a grid pattern. The light emitting state of the backlight 122 is controlled by the control unit 150, and the backlight 122 emits light along the optical axis toward the liquid crystal display 121.

The liquid crystal display 121 is configured to emit display light representing an image toward a plane mirror 130 on the opposite side from the backlight 122 using the light emitted from the backlight 122 . In this embodiment, the surface of the liquid crystal display 121 that emits display light (display surface 121a) faces, for example, in the horizontal direction, and the optical axis of the display light faces in the vertical direction of the vehicle 1 (the emitted direction is 1).

As shown in FIG. 7, the image formed by the liquid crystal display 121 includes, for example, gear information as vehicle information VI during driving, vehicle speed information (fixed form information 24), and destination guide information in a navigation device. It can be an image of an arrow displayed in AR in the foreground.

The liquid crystal display 121 is configured such that a display surface 121a can be formed by displaying a plurality of types of display information as described above one by one or by combining a plurality of types as in this embodiment. The driver can select which information to display using a display changeover switch.

The plane mirror 130 is a mirror with a flat reflecting surface, and the reflecting surface of the plane mirror 130 is arranged to face the liquid crystal display 121 and the concave mirror 140. The plane mirror 130 is configured to reflect display light from the liquid crystal display 121 onto the concave mirror 140.

The concave mirror 140 is a mirror that magnifies the reflected image from the plane mirror 130, and the reflecting surface of the concave mirror 140 is arranged to face the plane mirror 130 and the projection position 10a of the windshield 10. The concave mirror 140 is configured to reflect display light emitted from the liquid crystal display 121 and reflected by the plane mirror 130 to the projection position 10a of the windshield 10 through the opening 111 of the housing 110.

Note that the concave mirror 140 is supported by a shaft and is rotatable, and the direction of inclination of the concave mirror 140 shown in FIG. 1 is adjusted by the driver or the control unit 150. By adjusting the inclination angle of the concave mirror 140, the projection position 10a can be shifted so that the displayed image can be viewed at a suitable position for drivers of different physiques.

The control unit 150 performs display control related to image processing on the liquid crystal display 121 and angle control of the concave mirror 140. In addition, in this embodiment, the control section 150 includes a determination section 151 and a conversion section 152 (details will be described later).

The HUD device 100 is configured as described above. This embodiment is intended to make it possible to respond to the revision of the Japan Automobile Manufacturers Association's self-regulation (August 2004). The content of the revisions to the self-regulation will be briefly explained below using Figures 2 to 6.

As shown in FIGS. 2 and 3, first, a virtual plane (3 degrees above) that passes through the upper end V1 of the driver's eye box and forms an upward angle of 3 degrees with respect to the horizontal plane is where the virtual image 20 is displayed. A line that intersects in the virtual image area 20a is defined as a line U extending 3° upward. In addition, a virtual plane (downward 1°) that passes through the lower end V2 of the driver's eye box and makes an angle of 1° downward with respect to the horizontal plane is below the line that intersects in the virtual image area 20a where the virtual image 20 is displayed. Let it be a line L of 1°.

In the virtual image area 20a, an area above line U is defined as an upper area 20a1, an area below line L is defined as a lower area 20a2, and an area between lines U and L is defined as an intermediate area 20a3. The intermediate region 20a3 corresponds to a region on the center side in the vertical direction of the present disclosure. Note that in FIG. 2, EP is an eye point.

A predetermined reference figure S is assumed in the intermediate region 20a3. The reference figure S is a vertically long rectangular figure with a height of 2.6° and a width of 0.8°. The reference figures S are arranged horizontally and vertically adjacent to each other in the intermediate region 20a3, and serve as figures that virtually divide the intermediate region 20a3 into a plurality of regions.

Before the revision of the self-regulation, the display of the virtual image 20 in the intermediate area 20a3 was not permitted, but after the revision, the display of the virtual image 20 was conditionally possible even in the intermediate area 20a3.

In FIG. 3, as the virtual image 20, speed information 21 is formed in a lower region 20a2, forward vehicle information 22 is formed in an intermediate region 20a3, and further, traveling direction instruction information is formed across the lower region 20a2 and the intermediate region 20a3. 23 is shown.

There are no restrictions on the display of the speed information 21 in the lower area 20a2. The restriction is applied to the forward vehicle information 22 and the upper portion of the traveling direction instruction information 23 in the intermediate region 20a3.

As shown in FIG. 4, in the case of the forward vehicle information 22, the area a of the area (display area) occupied by the forward vehicle information 22 in one reference figure S is 35% or less of the area b of the reference figure S. (a/b≦35%).

Similarly, as shown in FIG. 5, in the case of the traveling direction instruction information 23, the area a of the area (display area) occupied by the traveling direction instruction information 23 in one reference figure S is larger than the area b of the reference figure S. It is regulated to be 35% or less (a/b≦35%).

As shown in FIG. 6, when a circle with a diameter of 0.85° is moved along the outer shape of the virtual image 20 to be displayed, the trajectory line is defined as an envelope line, and the inside thereof is defined as the area occupied by the virtual image 20. . However, as shown in FIG. 6C, even if the area is inside the virtual image 20, a portion that can encompass a 0.85° circle is excluded from the area occupied by the virtual image 20. Further, for example, in the virtual image 20 displaying road information shown in FIG. 6(d), when the interval between adjacent circles is larger than a circle of 0.85°, the virtual images 20 are set as separate display areas.

Next, based on the above self-regulation, the operation and effects of the HUD device 100 will be explained with reference to FIG.

When the HUD device 100 is turned on, the control unit 150 determines an image to be displayed, and causes the liquid crystal display 121 to form the image (image processing) via the drive circuit. Here, an image of fixed form information 24 including, for example, gear information in a transmission and vehicle speed information is formed so as to correspond to the lower region 20a2.

Further, when destination guidance is being executed by the navigation device, for example, if it is necessary to change the traveling direction (turn left) at a branch point such as the next intersection, the control unit 150 controls the traveling direction to be changed. An image of an arrow indicating ? is formed on the liquid crystal display 121 so as to correspond to the actual road visible in the intermediate area 20a3. At the same time, the control unit 150 controls the liquid crystal display so as to add an image of information (just Ahead XXXX) indicating the position (intersection name) at which the direction of travel is to be changed as the fixed form information 24 so as to correspond to the lower area 20a2. The image is formed on the display 121.

Then, as shown in FIG. 1, the liquid crystal display 121 causes the plane mirror 130 to emit image display light using the light emitted from the backlight 122. The plane mirror 130 reflects the display light emitted from the liquid crystal display 121 and directs it to the concave mirror 140 . Furthermore, the concave mirror 140 reflects the display light to the projection position 10a of the windshield 10 through the opening 111. The display light (image) reflected at the projection position 10a is displayed (imaged) as a virtual image 20 on the forward extension of the vehicle 1 (in front of the driver's visual field) of the line connecting the driver and the projection position 10a. It will be visible to the driver.

Of the virtual image 20, fixed information 24 indicating gear information and speed information is displayed in the lower area 20a2. Furthermore, when it becomes necessary to change the direction of travel, the name of the intersection where the direction of travel should be changed is additionally displayed as fixed form information 24 in the lower area 20a2. Further, an image of an arrow indicating the direction in which the vehicle should travel is displayed in real time in the intermediate region 20a3 so as to be superimposed on the actual road (AR display).

Here, when attempting to display the virtual image 20 in the intermediate region 20a3, the determination unit 151 of the control unit 150 determines whether the image of the virtual image 20 to be displayed satisfies the Automobile Manufacturers Association's self-regulations explained above. judge. In other words, the determination unit 151 determines that when the virtual image 20 displayed in real time in AR is divided by the reference figure S in the intermediate region 20a3, the area of each divided virtual image 20 is relative to the area of the reference figure S. , it is determined whether or not a predetermined ratio (35%) or less is satisfied.

Then, when the above conditions are not satisfied, the conversion unit 152 converts the image of the arrow on the liquid crystal display 121 based on a predetermined conversion pattern so that the above conditions are satisfied.

The conversion pattern of this embodiment is a pattern in which, with respect to an arrow that is normally formed as a single block, a part of the rear end of the arrow is displayed sequentially moving toward the tip. The converted image displayed in the intermediate area 20a3 is an arrow image 25a.

According to the present embodiment, the determination unit 151 determines the condition regarding the area ratio of the virtual image 20 displayed in the intermediate region 20a3 (the region on the center side of the display region) to the reference figure S, and determines that the condition is not satisfied. At this time, the conversion unit 152 converts the image so as to satisfy the conditions. Therefore, even when the virtual image 20 is displayed superimposed on the foreground (AR display), the visual field of the viewer is not obstructed by the virtual image 20 in the intermediate region 20a3.

In addition, in this embodiment, the virtual image 20 to be determined and converted is an arrow image 25a that indicates the direction in which the direction of travel should be superimposed on the road ahead (AR display). It is suitable for use. In AR display, first, an image of an arrow is formed so as to be superimposed on the road ahead, and after a determination is made, the formed arrow is converted, thereby making it easier to comply with self-regulation.

In addition, by displaying the arrow images so as to be divided and moved in order, the condition of the occupied area with respect to the reference figure S is satisfied, and the direction in which the arrow should proceed can be visually recognized in an easy-to-understand manner.

(Modification 1)
FIG. 8 shows a display form of the virtual image 20 in Modification 1 of the first embodiment. In Modification 1, the image conversion pattern for satisfying the self-regulation is a pattern that is entirely displayed as a line (thin line) like the arrow image 25b.

As a result, the arrow image 25b becomes a figure with a relatively small width, which easily satisfies the occupied area condition with respect to the reference figure S, and does not obstruct the viewer's field of view.

(Modification 2)
FIG. 9 shows a display form of the virtual image 20 in Modification 2 of the first embodiment. In Modified Example 2, the image conversion pattern to satisfy the self-regulation is a pattern in which only the outline line is left and there is no substance inside, such as the arrow image 25c. The interior of the arrow image 25c is designed to include a circle of 0.85°, as shown in FIG. 6(c).

As a result, since the interior of the arrow image 25c does not have any substance, the occupied area condition for the reference figure S can be easily satisfied. Since the inside of the arrow image 25c is displayed as a hollow part without substance, the view of the viewer is not obstructed.

(Modification 3)
FIG. 10 shows a display form of the virtual image 20 in Modification 3 of the first embodiment. In Modified Example 3, the image conversion pattern for satisfying the self-regulation is changed to Modified Example 2 by changing the main body of the arrow image 25d in the direction in which the arrow image 25d faces, like the arrow image 25d. The pattern is displayed by adding line portions 25d1 arranged so as to divide the pattern.

Thereby, the condition of the occupied area for the reference figure S can be easily satisfied, and the overall sense of substance of the arrow image 25d can be enhanced by the line portion 25d1. Since the inside of the arrow image 25d is displayed as a hollow part with almost no substance, the viewer's view is not obstructed.

(Modification 4)
FIG. 11 shows a display form of the virtual image 20 in Modification 4 of the first embodiment. In Modification Example 4, in contrast to Modification Example 2, the image conversion pattern for satisfying the self-regulation is changed to a partial entity portion that partially represents the entity inside the arrow image 25e, as in the arrow image 25e. 25e1 is displayed in a pattern that moves sequentially from the rear end side to the front end side of the arrow image 25e.

As a result, the inside of the arrow image 25e becomes the partial real portion 25e1, so that the occupied area condition for the reference figure S can be easily satisfied. Since the sub-entity portion 25e1 sequentially moves from the rear end side to the front end side, the direction of the arrow becomes easier to recognize. Since the interior of the arrow image 25e is displayed as a hollow part with almost no substance, the viewer's view is not obstructed.

(Modification 5)
FIG. 12 shows a display form of the virtual image 20 in Modification 5 of the first embodiment. In Modified Example 5, the image conversion pattern to satisfy the self-regulation is such that, like the arrow image 25f, one vertex of the triangle is arranged so as to face the tip side of the arrow image 25f, and a plurality of images are lined up. The pattern is displayed as follows.

Since the arrow image 25f is thereby divided into a plurality of triangles, it becomes possible to easily satisfy the occupied area condition for the reference figure S, and the view of the viewer is not obstructed.

(Other embodiments)
The disclosure in this specification, drawings, etc. is not limited to the illustrated embodiments. The disclosure includes the illustrated embodiments and variations thereon by those skilled in the art. For example, the disclosure is not limited to the combinations of parts and/or elements illustrated in the embodiments. The disclosure can be implemented in various combinations. The disclosure may have additional parts that can be added to the embodiments. The disclosure includes those in which parts and/or elements of the embodiments are omitted. The disclosure encompasses any substitutions or combinations of parts and/or elements between one embodiment and other embodiments. The disclosed technical scope is not limited to the description of the embodiments. The technical scope of some of the disclosures is indicated by the description of the claims, and should be understood to include equivalent meanings and all changes within the scope of the claims.

Further, in each of the above embodiments, the virtual image 20 subject to self-regulation has been described as the arrow images 25a to 25f, but the virtual image 20 is not limited to this, and for example, the virtual image 20 that is subject to self-regulation is Other virtual images 20 such as vehicle information 22 may be targeted.

Further, in each of the above embodiments, the windshield 10 of the vehicle 1 is used as a projection member for display light emitted from the liquid crystal display 121 (display device 120), but the present invention is not limited to this, and the HUD device 100 may be provided with a dedicated projection member. It may also be used as a combiner or the like.

Further, in each of the above embodiments, the liquid crystal display 121 (TFT liquid crystal display) is used as the display device 120, but instead of this, another type of display such as an organic EL display may be used. good.

Further, in each of the above embodiments, the reflecting section includes the plane mirror 130 and the concave mirror 140, but for example, the plane mirror 130 may be omitted by arranging the display light from the liquid crystal display 121 to be directed toward the concave mirror 140. It can also be used as a thing.

1 Vehicle 10 Windshield (projection member)
20 Virtual image 20a Virtual image area (display area)
20a3 Middle area (center side area)
25a to 25f Arrow image 25d1 Line portion 25e1 Partial entity portion 100 Head-up display device (virtual image display device for vehicle)
121 Liquid crystal display (display section)
130 Plane mirror (reflection part)
140 Concave mirror (reflection part)
150 Control section 151 Judgment section 152 Conversion section S Reference figure

Claims (8)

a display unit (121) that emits image display light;
a reflecting section (130, 140) that reflects the display light and projects it onto a projection member (10) located in front of a viewer;
A control unit (150) that controls the operation of the display unit,
A virtual image display device for a vehicle that displays the image to the viewer as a virtual image (20) in front of the projection member,
The control unit includes:
When the area (20a3) on the center side in the vertical direction of the display area (20a) in which the virtual image is displayed is divided by a plurality of predetermined reference figures (S), each of the divided virtual images a determination unit (151) that determines whether or not the area of the reference figure satisfies a condition that the area is less than or equal to a predetermined ratio with respect to the area of the reference figure;
A virtual image display device for a vehicle, comprising: a conversion unit (152) that converts the image based on a predetermined conversion pattern so that the condition is satisfied when the condition is not satisfied. The virtual image display device for a vehicle according to claim 1, wherein the virtual image is an image (25a to 25f) of an arrow that indicates the direction in which the vehicle (1) should travel in destination guidance so as to be superimposed on the road ahead. . 3. The virtual image display device for a vehicle according to claim 2, wherein the conversion pattern is a pattern in which a portion of the rear end of the arrow is sequentially moved toward the front end. The virtual image display device for a vehicle according to claim 2, wherein the conversion pattern is a pattern in which the entire arrow is displayed as a line. 3. The virtual image display device for a vehicle according to claim 2, wherein the conversion pattern is a pattern that is displayed in a hollow manner, leaving only the outline line of the arrow and having no substance inside. The conversion pattern is a pattern that is displayed by adding a line portion (25d1) arranged to divide the main body of the arrow in the direction in which the arrow points to the pattern that is displayed with a hollow outline. The virtual image display device for a vehicle according to claim 5. The conversion pattern is a pattern in which a partial entity portion (25e1) indicating a partial entity is displayed in the inside of the arrow so as to move in order from the rear end side to the front end side of the arrow. 5. The virtual image display device for a vehicle according to 5. 3. The virtual image display device for a vehicle according to claim 2, wherein the conversion pattern is a pattern in which a plurality of the conversion patterns are displayed in a row, with one vertex of a triangle facing toward the tip of the arrow.

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