Vehicle virtual image display device

Abstract

To provide a vehicle virtual image display device which can display a proper image without hindering a visual field of a driver in superimposed display to a foreground.SOLUTION: A vehicle virtual image display device comprises: a liquid crystal display 121 which emits display light of an image; a planar mirror 130 and a concave mirror 140 which reflect the display light to project the light onto a windshield 10 located in front of a viewer; and a control unit 150 which controls the operation of the display unit. The vehicle virtual image display device displays an image as a virtual image 20 on the front side of the viewer. The control unit comprises: a determination part 151 which determines whether or not such a condition that an area of each divided virtual image becomes equal to or less than a prescribed ratio with respect to an area of a reference graphic is satisfied when an intermediate region 20a3 in a virtual image region 20a where the virtual image is displayed is divided by a plurality of predetermined reference graphics S; and a conversion part 152 which converts an image on the basis of a predetermined conversion pattern so as to satisfy the condition when the condition is not satisfied.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a virtual image display device for a vehicle. [Background technology]

[0002] A known driving assistance information display system is described in Patent Document 1, for example. In the driving assistance information display system of Patent Document 1, a display area is provided on the front window of the vehicle, and information (display image) displayed in the display area can be viewed as a virtual image superimposed on the scenery ahead of the vehicle. As a display of driving assistance (guidance to a desired destination), an arrow indicating the direction in which the vehicle should proceed 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 terms of the display position, color, transparency, operation, shape, size, etc.

[0003] This allows for the addition of information for safe driving to the driving assistance information that indicates the direction in which the vehicle should go, allowing the driver to grasp the direction in which the vehicle should go without significantly shifting their line of sight, and also allowing the driver to intuitively obtain information for safe driving by referring to changes in the display mode of the graphics in the moving image. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-284458 Summary of the Invention [Problem to be solved by the invention]

[0005] In vehicle virtual image display devices, the Japan Automobile Manufacturers Association (JAMA) voluntary regulations prohibited the display of images in the vertically central region of the area where the virtual image is displayed, so as to prevent the displayed virtual image from obstructing the driver's field of vision. However, following revisions to the voluntary regulations, image display in the central region has become possible under certain conditions. The condition for display is that when the central region is divided by a predetermined reference figure of a specified area, the divided virtual image in any part does not exceed a specified proportion of each reference figure.

[0006] Here, for example, if one wishes to display a virtual image 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 satisfy the above-mentioned self-regulations will be undesirable as a display image for a virtual image display device.

[0007] In view of the above-mentioned problems, an object of the present disclosure is to provide a virtual image display device for a vehicle that can display an appropriate image superimposed on the foreground without obstructing the driver's field of vision. [Means for solving the problem]

[0008] In order to achieve the above object, the present disclosure employs the following technical means.

[0009] 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 a viewer; a control unit (150) that controls the operation of the display unit; A vehicle virtual image display device that displays an image to a viewer as a virtual image (20) in front of a projection member, The control unit When trying to display a virtual image, a determination unit (151) that determines whether or not a condition is satisfied that, when a region (20a3) on the vertical center side of a display region (20a) in which a virtual image is displayed is divided by a plurality of predetermined reference figures (S), the area of ​​each divided virtual image is equal to or smaller than a predetermined ratio of the area of ​​the reference figures; 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; death, Display the converted image as a virtual image do.

[0010] According to the present disclosure, a determination unit determines a condition regarding the area ratio of a virtual image displayed in a central area of ​​a display area to a reference figure, and if the condition is not satisfied, a conversion unit converts the image so that the condition is satisfied. Therefore, even when a virtual image is superimposed on the foreground, the viewer's field of view is not obstructed by the virtual image in the central display area. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is an explanatory diagram showing the overall configuration of a virtual image display device for a vehicle; [Figure 2] An explanatory diagram showing a line 3° above and a line 1° below. [Figure 3] FIG. 2 is an explanatory diagram showing an area in which a virtual image is displayed. [Figure 4] FIG. 10 is an explanatory diagram showing a case where a virtual image is displayed in an intermediate region. [Figure 5] FIG. 10 is an explanatory diagram showing a case where a virtual image straddles a lower region and a middle region. [Figure 6] FIG. 2 is an explanatory diagram showing an area occupied by a virtual image. [Figure 7] FIG. 2 is an explanatory diagram showing an image of an arrow in the first embodiment. [Figure 8] FIG. 10 is an explanatory diagram showing an image of an arrow in Modification 1. [Figure 9] FIG. 10 is an explanatory diagram showing an image of an arrow in Modification 2. [Figure 10] FIG. 10 is an explanatory diagram showing an image of an arrow in Modification 3. [Figure 11] FIG. 10 is an explanatory diagram showing an image of an arrow in a fourth modified example. [Figure 12] FIG. 13 is an explanatory diagram showing an image of an arrow in Modification 5. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, several embodiments for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, parts corresponding to matters described in the preceding embodiment will be assigned the same reference numerals, and duplicate descriptions may be omitted. In each embodiment, when only a part of the configuration is described, other previously described embodiments may be applied to the other parts of the configuration. In addition to combinations of parts that are specifically specified as being combinable in each embodiment, it is also possible to partially combine embodiments even if not specified, as long as there is no particular problem with the combination.

[0013] (First embodiment) A virtual image display device for a vehicle according to a first embodiment will be described with reference to Fig. 1 to Fig. 7. As shown in Fig. 1, the virtual image display device for a vehicle is a device that projects an image from 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.

[0014] That is, the vehicle virtual image display device projects display light (solid arrow in FIG. 1) representing an image emitted from the display device 120 onto a projection position 10a on the windshield 10 of the vehicle 1. The vehicle virtual image display device then superimposes and displays the image as a virtual image 20 on a forward extension of the vehicle 1 of a line connecting the driver (viewer) and the projection position 10a (forward of the windshield 10 = foreground), allowing the driver to view the image. Such a vehicle virtual image display device is called a head-up display device, and hereinafter referred to as an "HUD device 100."

[0015] In this embodiment, the HUD device 100 performs, for example, an AR (Augmented Reality) display in a middle region 20a3 of the virtual image region 20a (FIG. 3) where the virtual image 20 is displayed, and performs a standard display (non-AR display) without AR display in a lower region 20a2. The AR display is a display in which the virtual image 20 is superimposed on superimposed objects in the foreground of the driver, such as other vehicles, pedestrians, cyclists, and the driving route. The superimposed virtual image 20 is, for example, an arrow image (arrow images 25a to 25f, described later) that indicates the direction to travel relative to the driving route (foreground) when destination guidance is provided by the satellite positioning system 51.

[0016] The windshield 10 is a shield on the front side of the vehicle 1, and is made of, for example, laminated glass formed from two pieces of glass with an intermediate film placed between them. When viewed from above the vehicle 1 and from the side of the vehicle 1, the windshield 10 has a curvature that makes the interior side of the vehicle 1 concave, and has the same effect as a concave mirror, allowing the displayed image to be enlarged and displayed at a greater distance.

[0017] The HUD device 100 includes a housing 110, a display device 120, a reflecting unit (a plane mirror 130 and a concave mirror 140), and a control unit 150. Various signals (information) detected by a global navigation satellite system 51 (GNSS), a front camera 52, a vehicle ECU 53, and the like mounted on the vehicle 1 are input to the control unit 150 via a communication bus 60.

[0018] The satellite positioning system 51 is mounted on the vehicle 1 and is a device that sequentially detects the current position PL and traveling direction DT of the vehicle 1 by receiving navigation signals transmitted from positioning satellites that make up the GNSS (Global Navigation Satellite System). 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. The satellite positioning system 51 can be, for example, GPS, GLONASS, Galileo, IRNSS, QZSS, Beidou, or the like. For example, the satellite positioning system 51 can be a system that is applied to a navigation device of the vehicle 1.

[0019] The front camera 52 is provided, for example, on the front of the ceiling inside the vehicle cabin, and outputs, as detection information, data of a front image FI obtained by capturing an image of the front view (forward area) of the vehicle 1. The front camera 52 is, for example, a CCD camera, a CMOS camera, an infrared camera, or the like.

[0020] The vehicle ECU 53 is a control means for controlling the operation of various functional units 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, etc.

[0021] Next, in the HUD device 100, the housing 110 is a case member that houses the display device 120, the reflecting units (the flat mirror 130 and the concave mirror 140), the control unit 150, etc., and has the shape of, for example, a rectangular parallelepiped. An opening 111 is formed on the upper side (windshield 10 side) of the housing 110 so that display light from the display device 120 can exit (pass through). A light-transmitting dustproof sheet is provided in the opening 111 to prevent dust, dirt, and the like from entering the housing 110. The housing 110 is disposed in the instrument panel of the vehicle 1. An instrument panel opening is also formed on the top surface of the instrument panel so that the display light can pass through.

[0022] The display device 120 includes a liquid crystal display 121, a backlight 122, and the like.

[0023] The liquid crystal display 121 is illuminated by light from the backlight 122 and displays a predetermined image on the display surface 121a, and is driven and controlled (image processed) by the control unit 150. The liquid crystal display 121 is, for example, a TFT liquid crystal display using thin film transistors (TFTs). The liquid crystal display 121 corresponds to the display unit of the present disclosure.

[0024] The backlight 122 is disposed on the rear side of the liquid crystal display 121 (opposite the display surface 121a), and serves as a light source unit that emits light when energized (supplied with power) and irradiates the liquid crystal display 121 with light for displaying images. The backlight 122 uses, for example, light emitting diodes (LEDs). 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 irradiates light along an optical axis toward the liquid crystal display 121.

[0025] The liquid crystal display 121 emits display light representing an image by using light emitted from the backlight 122 toward the plane mirror 130 on the opposite side of the backlight 122. In this embodiment, the surface (display surface 121a) of the liquid crystal display 121 that emits the display light faces, for example, horizontally, and is disposed so that the optical axis of the display light faces in the vertical direction of the vehicle 1 (the emission direction faces upward of the vehicle 1).

[0026] As shown in FIG. 7, the image formed by the liquid crystal display 121 can be, for example, gear information as vehicle information VI while driving, vehicle speed information (standard information 24), and an arrow image displayed in AR in the foreground as guidance information to the destination in the navigation device.

[0027] The liquid crystal display 121 is capable of forming the display surface 121a with the above-mentioned types of display information either individually or, as in this embodiment, in combination with a plurality of pieces of display information. The driver can select which information to display using a display changeover switch.

[0028] The plane mirror 130 is a mirror whose reflective surface is flat, and is disposed so that the reflective surface of the plane mirror 130 faces the liquid crystal display 121 and the concave mirror 140. The plane mirror 130 reflects the display light from the liquid crystal display 121 to the concave mirror 140.

[0029] Concave mirror 140 is a mirror that magnifies the reflected image from plane mirror 130, and is arranged so that the reflective surface of concave mirror 140 faces plane mirror 130 and projection position 10a on windshield 10. Concave mirror 140 reflects the display light that is emitted from liquid crystal display 121 and reflected by plane mirror 130 through opening 111 in housing 110 to projection position 10a on windshield 10.

[0030] The concave mirror 140 is supported by a shaft and is rotatable, and the tilt direction of the concave mirror 140 shown in Fig. 1 can be adjusted by the driver or the control unit 150. By adjusting the tilt angle of the concave mirror 140, the projection position 10a can be shifted individually for drivers of different physiques, so that the displayed image can be viewed at a suitable position.

[0031] The control unit 150 controls display related to image processing on the liquid crystal display 121 and controls the angle of the concave mirror 140. Additionally, in this embodiment, the control unit 150 has a determination unit 151 and a conversion unit 152 (described in detail later).

[0032] The HUD device 100 is configured as described above. This embodiment is intended to be able to comply with the revision of the self-imposed restrictions imposed by the Japan Automobile Manufacturers Association (August 2004). The details of the revision of the self-imposed restrictions will be briefly explained below with reference to Figs. 2 to 6.

[0033] 2 and 3, first, a line U at 3° above is defined as a line where a virtual plane (upper 3°) that passes through the upper end V1 of the driver's eyebox and forms an angle of 3° upward with respect to the horizontal plane intersects with the virtual image area 20a where the virtual image 20 is displayed. Also, a line L at 1° below is defined as a line where a virtual plane (lower 1°) that passes through the lower end V2 of the driver's eyebox and forms an angle of 1° downward with respect to the horizontal plane intersects with the virtual image area 20a where the virtual image 20 is displayed.

[0034] In the virtual image region 20a, the region above the line U is defined as an upper region 20a1, the region below the line L as a lower region 20a2, and the region between the lines U and L as a middle region 20a3. The middle region 20a3 corresponds to the region on the center side in the vertical direction in this disclosure. In FIG. 2, EP is the eye point.

[0035] 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 adjacent to each other on the left and right and above and below in the intermediate region 20a3, and are figures that virtually divide the intermediate region 20a3 into a plurality of regions.

[0036] Before the revision of the voluntary restrictions, the display of the virtual image 20 in the intermediate region 20a3 was not permitted, but after the revision, the display of the virtual image 20 in the intermediate region 20a3 became possible under certain conditions.

[0037] Figure 3 shows an example in which speed information 21 is formed in the lower area 20a2, forward vehicle information 22 is formed in the middle area 20a3, and further, direction of travel indication information 23 is formed across the lower area 20a2 and the middle area 20a3 as a virtual image 20.

[0038] There is no restriction on the display of the speed information 21 in the lower area 20a2. Restrictions are applied to the preceding vehicle information 22 and the upper part of the driving direction indication information 23 in the middle area 20a3.

[0039] As shown in Figure 4, in the case of 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 restricted to be 35% or less of the area b of the reference figure S (a / b≦35%).

[0040] Similarly, as shown in FIG. 5, in the case of the driving direction indication information 23, the area a of the area (display area) occupied by the driving direction indication information 23 in one reference figure S is restricted to be 35% or less of the area b of the reference figure S (a / b≦35%).

[0041] As shown in Fig. 6, the trajectory of a circle with a diameter of 0.85° moved along the outline of the virtual image 20 to be displayed is taken as an envelope, and the area inside the envelope is defined as the area occupied by the virtual image 20. However, as shown in Fig. 6(c), even within the area surrounded by the virtual image 20, a portion that can contain the 0.85° circle is excluded from the area occupied by the virtual image 20. Also, for example, in the virtual image 20 displaying road information shown in Fig. 6(d), when the spacing between adjacent images is greater than the 0.85° circle, they are defined as separate display areas.

[0042] Next, in light of the above self-imposed restrictions, the operation and effects of the HUD device 100 will be described with reference to FIG.

[0043] 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 (performs image processing) via a drive circuit. Here, an image of standard information 24 having, for example, gear information for the transmission or vehicle speed information is formed so as to correspond to the lower area 20a2.

[0044] Furthermore, when destination guidance is being performed by the navigation device and it is necessary to change the traveling direction (to turn left) at a branch point such as the next intersection, the control unit 150 causes the liquid crystal display 121 to form an image of an arrow indicating the traveling direction to be changed so as to correspond to the actual road visually recognized in the middle area 20a3. In addition, the control unit 150 causes the liquid crystal display 121 to form an image of information (just ahead XXXX) indicating the position (intersection name) where the traveling direction is to be changed as fixed information 24 so as to correspond to the lower area 20a2.

[0045] 1, the liquid crystal display 121 emits display light of an image to the plane mirror 130 using light emitted from the backlight 122. The plane mirror 130 reflects the display light emitted from the liquid crystal display 121 and emits it to the concave mirror 140. The concave mirror 140 then reflects the display light to the projection position 10a on the windshield 10 through the opening 111. The display light (image) reflected at the projection position 10a is displayed (formed) as a virtual image 20 on a forward extension of the line connecting the driver and the projection position 10a of the vehicle 1 (in front of the driver's field of vision), and is visible to the driver.

[0046] Of the virtual image 20, fixed form information 24 indicating gear information and speed information is displayed in the lower region 20a2. Furthermore, when it becomes necessary to change the direction of travel, the name of the intersection at which the direction of travel should be changed is additionally displayed in the lower region 20a2 as fixed form information 24. Furthermore, an image of an arrow indicating the direction of travel is displayed in real time in the middle region 20a3 so as to be superimposed on the actual road (AR display).

[0047] When virtual image 20 is to be displayed in intermediate region 20a3, determination unit 151 of control unit 150 determines whether the image of virtual image 20 to be displayed satisfies the above-described voluntary restrictions of the Japan Automobile Manufacturers Association. In other words, determination unit 151 determines whether the condition is satisfied that, when virtual image 20 displayed in real time using AR in intermediate region 20a3 is divided by reference figure S, the area of ​​each divided virtual image 20 is equal to or smaller than a predetermined percentage (35%) of the area of ​​reference figure S.

[0048] If the above condition is 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 condition is satisfied.

[0049] The conversion pattern of this embodiment is a pattern in which a portion of the rear end of the arrow is displayed in sequence moving toward the tip of the arrow, as opposed to an arrow normally formed as a single block. The image that is converted and displayed in the intermediate area 20a3 is an arrow image 25a.

[0050] According to this embodiment, the determining unit 151 determines a condition regarding the area ratio of the virtual image 20 displayed in the intermediate region 20a3 (the region toward the center of the display region) to the reference figure S, and if the condition is not satisfied, the converting unit 152 converts the image so that the condition is satisfied. Therefore, even when the virtual image 20 is superimposed on the foreground (AR display), the viewer's field of view is not obstructed by the virtual image 20 in the intermediate region 20a3.

[0051] In this embodiment, the virtual image 20 to be judged and converted is an arrow image 25a that indicates the direction to travel and is superimposed (AR display) on the road ahead, which is suitable for use in virtual image display based on a navigation device. In the AR display, an arrow image is first formed to be superimposed on the road ahead, and after judgment, the formed arrow is converted, making it easy to comply with voluntary restrictions.

[0052] Furthermore, by dividing the image of the arrow and displaying it as moving in order, the condition of the area occupied by the reference figure S is met, and the direction in which the arrow should move is easily recognized.

[0053] (Variation 1) 8 shows the display form of virtual image 20 in Modification 1 of the first embodiment. In Modification 1, the image conversion pattern for satisfying self-regulation is a pattern in which the entire image is displayed as lines (thin lines), such as arrow image 25b.

[0054] As a result, the arrow image 25b has a relatively small width, and can easily satisfy the condition of the area occupied by the reference image S, without obstructing the viewer's field of vision.

[0055] (Variation 2) Fig. 9 shows the display form of virtual image 20 in Modification 2 of the first embodiment. In Modification 2, the image conversion pattern for satisfying the self-regulation is a pattern in which only the outline of the image remains and the interior is hollowed out with no substance, as in arrow image 25c. The interior of arrow image 25c is designed to contain a 0.85° circle, as shown in Fig. 6(c).

[0056] As a result, the inside of the arrow image 25c has no substance, and therefore it is possible to easily satisfy the condition of the area occupied by the reference figure S. The inside of the arrow image 25c is displayed as a hollow with no substance, so the viewer's field of vision is not obstructed.

[0057] (Variation 3) 10 shows the display form of virtual image 20 in Modification 3 of the first embodiment. In Modification 3, in contrast to Modification 2, the image transformation pattern for satisfying self-regulation is a pattern in which, like arrow image 25d, line portion 25d1 is added and arranged to divide the main body of arrow image 25d in the direction in which arrow image 25d faces.

[0058] This makes it possible to easily satisfy the condition of the area occupied by the reference figure S, and also makes it possible to enhance the overall sense of reality of the arrow image 25d by the line portion 25d1. The inside of the arrow image 25d is displayed as a hollow with almost no substance, so the viewer's field of vision is not obstructed.

[0059] (Variation 4) 11 shows the display form of virtual image 20 in Variation 4 of the first embodiment. In Variation 4, in contrast to Variation 2, the image transformation pattern for satisfying the self-regulation is a pattern in which, like arrow image 25e, partial substance portion 25e1 indicating a partial substance within arrow image 25e moves sequentially from the rear end side to the front end side of arrow image 25e.

[0060] As a result, the interior of arrow image 25e becomes partial body portion 25e1, which makes it possible to easily satisfy the condition of the area occupied by reference figure S. Furthermore, partial body portion 25e1 moves sequentially from the rear end side to the front end side, making it easier to recognize the direction of the arrow. The interior of arrow image 25e is displayed as a hollow with almost no substance, so the viewer's field of vision is not obstructed.

[0061] (Variation 5) 12 shows the display form of virtual image 20 in Modification 5 of the first embodiment. In Modification 5, the image conversion pattern for satisfying the self-regulation is a pattern in which multiple images are displayed side by side, such as arrow image 25f, with one vertex of a triangle pointing toward the tip of arrow image 25f.

[0062] As a result, the arrow image 25f is divided into a plurality of triangles, so that the condition of the area occupied by the reference figure S can be easily satisfied and the viewer's field of vision is not obstructed.

[0063] (Other embodiments) The disclosure in this specification and drawings, etc. is not limited to the exemplified embodiments. The disclosure encompasses the exemplified embodiments and modifications thereto by those skilled in the art. For example, the disclosure is not limited to the combinations of parts and / or elements shown in the embodiments. The disclosure can be implemented in various combinations. The disclosure can have additional parts that can be added to the embodiments. The disclosure encompasses the omission of parts and / or elements from the embodiments. The disclosure encompasses the substitution or combination of parts and / or elements between one embodiment and another embodiment. The disclosed technical scope is not limited to the description of the embodiments. Some disclosed technical scopes are defined by the claims, and should be interpreted as including all modifications within the meaning and scope equivalent to the claims.

[0064] Furthermore, in each of the above embodiments, the virtual images 20 that are subject to self-regulation have been described as arrow images 25a to 25f, but this is not limited to this, and other virtual images 20, such as forward vehicle information 22 as described in Figure 6(b), may also be the subject of self-regulation.

[0065] In addition, in each of the above embodiments, the windshield 10 of the vehicle 1 is used as a projection member for the display light emitted from the liquid crystal display 121 (display device 120), but this is not limited to this, and it may also be a combiner or the like that is provided exclusively for the HUD device 100.

[0066] Furthermore, in each of the above embodiments, the liquid crystal display 121 (TFT liquid crystal display) is used as the display device 120, but instead, other types of displays such as an organic EL display may be used.

[0067] Furthermore, in each of the above embodiments, the reflecting section includes a plane mirror 130 and a concave mirror 140. However, for example, the display light from the liquid crystal display 121 may be arranged to be directed toward the concave mirror 140, and the plane mirror 130 may be eliminated. [Explanation of symbols]

[0068] 1 vehicle 10 Windshield (projection component) 20 Virtual Image 20a Virtual image area (display area) 20a3 Intermediate area (area on the central side) 25a~25f Arrow statue 25d1 Line part 25e1 Partial entity 100 Head-up display device (vehicle virtual image display device) 121 LCD display (display unit) 130 Plane mirror (reflection part) 140 Concave mirror (reflection part) 150 control section 151 Judgment section 152 Conversion Unit S Reference Shape

Claims

1. 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 vehicle virtual image display device that displays the image to the viewer as a virtual image (20) in front of the projection member, The control unit a determination unit (151) that, when attempting to display the virtual image, determines whether or not a condition is satisfied in which, when a region (20a3) on the vertical center side of a display region (20a) in which the virtual image is displayed is divided by a plurality of predetermined reference figures (S), the area of ​​each of the divided virtual images is equal to or smaller than a predetermined ratio to the area of ​​the reference figures; a conversion unit (152) that converts the image based on a predetermined conversion pattern so as to satisfy the condition when the condition is not satisfied, A vehicle virtual image display device that displays the converted image as a virtual image.

2. 2. The vehicle virtual image display device according to claim 1, wherein the virtual image is an arrow image (25a to 25f) that indicates the direction in which the vehicle (1) should proceed during destination guidance, 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 part of the rear end of the arrow is displayed to move in sequence toward the tip end.

4. 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.

5. 3. The vehicle virtual image display device according to claim 2, wherein the conversion pattern is a hollowed-out pattern in which only the outline of the arrow remains and there is no substance inside.

6. 6. The vehicle virtual image display device according to claim 5, wherein the conversion pattern is a pattern in which a line portion (25d1) arranged to divide the main body of the arrow in the direction of the arrow is added to the hollowed-out displayed pattern.

7. 6. The vehicle virtual image display device according to claim 5, wherein the transformation pattern is a pattern in which a partial entity portion (25e1) indicating a partial entity within the arrow is displayed so as to move sequentially from the rear end side to the front end side of the arrow.

8. The vehicle virtual image display device according to claim 2 , wherein the transformation pattern is a pattern in which a plurality of triangles are displayed side by side, with one vertex of each triangle pointing toward the tip of the arrow.

Images