JP7354846B2 - heads up display device - Google Patents

Description

The present invention relates to a head-up display (HUD) device and the like that displays a virtual image on a vehicle windshield, combiner, etc.

Patent Document 1 describes a HUD device (3D HUD device) that performs image rendering and selectively uses 3D display and 2D display. Further, Patent Document 2 describes a HUD device that displays a virtual image on a virtual image display surface that is inclined with respect to the road surface.

JP2019-62532A JP 2018-120135 Publication

The inventors have recognized the new problem described below. A 3D HUD device can display a clear stereoscopic virtual image (stereoscopic virtual image) by displaying a virtual image based on parallax images for both eyes of the user. On the other hand, for example, among real scenes (such as scenery seen through a windshield), things that are far away appear visually blurred (in other words, they appear out of focus).

Therefore, the virtual image displayed by the HUD device may be viewed by the user more clearly than the actual scenery. It cannot be denied that if this state continues for a long time, it may give the user a feeling of visual fatigue, for example.

An object of the present invention is to provide a HUD device that can reduce eye fatigue of a driver.

Other objects of the invention will become apparent to those skilled in the art upon reference to the following illustrative aspects and best embodiment, and the accompanying drawings.

Below, embodiments according to the present invention will be illustrated in order to easily understand the outline of the present invention.

In a first aspect, the head-up display device includes:
A head-up display (HUD) device that is mounted on a vehicle and projects an image onto a projection member provided in the vehicle to allow a driver to visually recognize a virtual image of the image,
a display unit including a display surface that displays images for the left eye and for the right eye;
an optical member that is disposed in contact with or in close proximity to the display section and has a light beam separation function that separates each light beam of each image for the left eye/right eye;
an optical system including an optical member that reflects display light of the image and projects it onto the projection target member;
a display control unit that controls image display on the display unit;
has
The display surface of the display unit is arranged obliquely with respect to the optical axis of the extraoptical system,
The virtual image display surface, which is optically conjugate with the display surface, has a distance between the far end, which is the end farthest from the driver, and the road surface, and the near end, which is the end near the driver. A plane or curved surface arranged at an angle with respect to the road surface so as to be larger than a distance from the road surface, or a plane or curved surface arranged so as to be superimposed on the road surface,
An imaging plane that is optically conjugate with a parallax image as a stereoscopic image obtained based on the left-eye/right-eye images is located closer to the driver than the virtual image display plane, and a flat or curved surface whose front end coincides with or substantially coincides with the near end of the virtual image display surface, and whose rear end is separated from the far end of the virtual image display surface;
The display control section includes:
When displaying the left-eye/right-eye images on the display surface, display control is performed assuming that the parallax image is formed on the image formation surface.

In the first aspect, the display surface of the display unit is arranged to be inclined with respect to the optical system of the HUD device, so that the virtual image display surface that is optically conjugate with the display surface is in front of the driver (as the vehicle progresses). This is a flat or curved surface that is inclined with respect to the road surface so that the back side is further away from the road surface than the front side.

In addition, left-eye and right-eye images are simultaneously displayed on the display surface, and display light for each image is generated simultaneously. This can be considered to mean that each display light is generated from the parallax image as a 3D image.In other words, it can be seen that the parallax image is restored by associating the left and right images (however, in reality, (In this case, each display light is reproduced, and each display light is separated and does not proceed individually and form an image. Therefore, such a parallax image cannot be perceived.)

Originally (conventionally), the parallax image is formed as a virtual image on the virtual image display surface, but in the present invention, the parallax image is placed closer to the driver as seen from the virtual image display surface. The image is formed on the plane where the object is located (imaging plane). In other words, an imaging plane that is optically conjugate with the parallax image and different from the virtual image display plane can be assumed. The optical system of the HUD device is designed to form a parallax image on the imaging plane, and display contents are drawn on the display surface assuming that the parallax image will be imaged on the imaging plane. The images (left eye/right eye images) will be displayed.

Here, the near end (end) of the imaging surface (virtual surface) coincides with or almost coincides with the near end (end near the driver) of the virtual image display surface, but The virtual image display surface is a flat or curved surface whose side end (end) is placed away (toward the near side) from the far end (the end farthest from the driver) of the virtual image display surface.

When a driver (user of a HUD device) perceives a parallax image with both eyes, each line of sight determined by the convergence angle between the left and right eyes is not directed to the virtual image display surface, but to the image formation surface (in other words, the image is formed and clearly This results in a virtual virtual image that is optically conjugate with the parallax image, which is felt to have a high degree of accuracy.

As a result, the focus of the left and right eyes is adjusted to the position of the imaging plane. In other words, human perception tends to focus on the imaging plane.

However, the light directed toward each of the left and right eyes is emitted from a virtual image display surface that is optically conjugate with the display surface of the display section. In other words, it is the display surface of the display section that actually emits light, and therefore, light comes to the human eye from the virtual image display surface that is optically conjugate with the display surface. For this reason, the left and right eyes, which have focused on the image plane, see the virtual image on the virtual image display plane located behind the image plane, and as a result, they see a blurred virtual image that is out of focus. It means to visually recognize (perceive).

On the side closer to the driver, the distance between the virtual image display surface and the image formation surface is not large. The distance between each surface increases as the distance from the driver increases. Therefore, the further away from the driver, the greater the degree of blurring of the virtual image perceived on the virtual image display surface. Therefore, the displayed image (virtual image) is a naturally blurred image similar to the surrounding background image. Therefore, the driver's discomfort is reduced, and eye fatigue is also reduced.

In a second aspect subordinate to the first aspect,
The degree of blur in a second region located closer to the far end than the first region is greater than the degree of blur in the first region located closer to the near end on the virtual image display surface. may be set to be large.

According to the second aspect, for example, by distinguishing the first area/second area and displaying virtual images with different degrees of blur in each area, It becomes possible to display an image (virtual image) with appropriate blur.

In a third aspect dependent on the first or second aspect,
As the virtual image display distance, which is the distance between the virtual image displayed on the virtual image display surface and the driver's viewpoint or a predetermined reference point of the vehicle, increases, the degree of blur in the virtual image also increases. You may also do so.

According to the third aspect, for example, on the virtual image display surface that is inclined in the traveling direction (depth direction) of the vehicle (or superimposed on the road surface), a long image is displayed from the near end toward the far end. When displaying an extending image (virtual image), the degree of blurring can be changed depending on the virtual image display distance, and a natural and natural display can be realized. Therefore, it is possible to easily realize a display that is easy to see and causes less eye fatigue.

In a fourth aspect that is dependent on the second or third aspect,
The display control unit displays a virtual image of a display target for which it is important to accurately convey information to the driver in an area with a low degree of blur on the virtual image display surface,
A virtual image of a display target for which it is important to provide the driver with a comfortable vision may be displayed in an area where the degree of blur is high.

Images that require accurate information include, for example, characters, icons, etc. that indicate information about the vehicle, information about the surroundings of the vehicle, navigation information, and the like. Specifically, vehicle speed display, road speed limit information, turn-by-turn information (for example, intersection name information, POI (specific point on a map) information, etc.) can be exemplified. These require display accuracy or quick recognition, and since vehicle speed displays are often displayed all the time, it is important to display a focused virtual image in front of the user for easy viewing. Good.

An example of an image in which the visibility of natural blur is important is an image of a sign or signboard located far away. Preferably, the sign or signboard has a blur that matches the degree of blur in the surrounding actual scene. In addition, information such as arrow information as a route guide, colored graphic information indicating frozen road surface areas, and ADAS (Advanced Driving Assistance System) information that assists the user, the driver, in operating the steering wheel and equipment, etc. Although it depends on the case, it is generally preferable to display a display that gives a sense of depth and is moderately out of focus.

In a fifth aspect subordinate to any one of the first to fourth aspects,
The display control unit may perform display control on the virtual image display surface such that the displayed virtual image moves closer to the vehicle as time passes.

In the fifth aspect, when display control is performed so that the virtual image approaches the own vehicle over time, the amount of blur (out of focus) is automatically adjusted appropriately according to the position of the virtual image. Therefore, it is possible to easily realize a dynamic display that does not give any sense of discomfort. In other words, if the sharpness of the virtual image is uniform regardless of its distance, it may feel unnatural to the user. According to this aspect, natural blurring occurs according to the movement of the virtual image, so visibility does not deteriorate. The movement display control of this aspect may be performed, for example, when various displays for navigation are moved on the road surface in accordance with the progress of the vehicle, or when a sign indicating a speed limit is moved from a distance to a nearby place. There are cases where it is moved to .

In a sixth aspect subordinate to any one of the first to fifth aspects,
The display control unit reduces the degree of blurring when the virtual image displayed in the area of the virtual image display surface where the degree of blurring is high is determined to have a higher degree of urgency or importance than usual. Display control may also be implemented.

In the sixth aspect, when the display control unit displays the parallax images on the display surface of the display unit, the display control unit individually performs image processing to suppress blurring or emphasize shadows or external shapes, for example. It is possible to perform corrections to increase sharpness.

Even if the virtual image is located far away and would be better to be displayed in a somewhat blurred manner, there may be cases where it is not necessary to reduce its resolution. For example, notifications in important driving situations, such as when displaying a warning mark in the distance to notify of a traffic accident that has occurred in front of the vehicle, or in the case of a danger warning to notify that an intervening vehicle remains in a dangerous position. This is the case in the case of a highly important display that cannot be missed, such as a time display or an expressway exit notification. It can be said that it is preferable to display a virtual image of such an object clearly regardless of distance.

Therefore, in this case, the display control unit individually performs image processing and individually performs correction to increase sharpness (including emphasis processing, etc.) to individually repair the optical member of the present embodiment. It is possible to prevent any negative effects from occurring when using . Even in this case, since the image processing is performed individually, the burden on the image processing software does not increase significantly, and no problem occurs.

Those skilled in the art will readily understand that the embodiments according to the invention as illustrated may be further modified without departing from the spirit of the invention.

FIG. 1(A) is a diagram showing a comparative example, and FIG. 1(B) is a diagram showing a display example in a HUD device to which the present invention is applied. FIG. 2 is a diagram for explaining the principle of producing blur in the present invention. FIG. 3(A) is a diagram showing the principle of a 3D HUD device, and FIG. 3(B) is a diagram showing an example of display of a parallax image in the HUD device. FIG. 4(A) is a diagram for explaining reproduction of light rays of a stereoscopic image (parallax image), and FIG. 4(B) is a diagram showing an example of a lenticular lens. FIG. 5 is a diagram showing an example of the configuration of a control unit (display control unit) and an example of a pixel configuration in the display unit (flat panel display). FIG. 6 is a diagram showing an example of the configuration of a HUD device mounted on a vehicle, and an example of a virtual image display surface and an imaging surface. FIG. 7 is a diagram illustrating an example of a virtual image viewed by a user through a windshield. 8(A) and 8(B) are diagrams showing display examples when a virtual image is displayed so as to stick to the road surface, and FIG. It is a figure showing an example. FIG. 9(A) is a diagram showing an example of a system configuration of a HUD device, and FIG. 9(B) is a diagram showing an example of a configuration of a display control section. FIG. 10 is a diagram showing an example of the overall configuration of the HUD device. FIG. 11 is a flowchart illustrating an example of the procedure of display processing by the display control unit.

The best embodiment described below is used to facilitate understanding of the present invention. Therefore, those skilled in the art should note that the invention is not unduly limited by the embodiments described below.

Please refer to FIG. FIG. 1(A) is a diagram showing a comparative example, and FIG. 1(B) is a diagram showing a display example in a HUD device to which the present invention is applied. First, a comparative example (an example to which the present invention is not applied) will be described. Note that this comparative example was studied by the inventor before the present invention, and is not a prior art.

In FIG. 1A, the width direction of the vehicle 1 is the X direction (left-right direction), and the direction perpendicular to the road surface (not shown in FIG. 1, reference numeral 40 in FIG. 6) is the Y direction (vertical direction or height direction). direction), and the traveling direction of the vehicle 1 is the Z direction (front-back direction or depth direction). Here, when the Y direction is expressed as an up-down direction, the upward direction is a direction away from the road surface 40, and the downward direction is a direction approaching the road surface 40. Furthermore, when the Z direction is expressed as a depth direction, the direction that goes farther away from the vehicle 1 is the back (rear side), and the direction that approaches the vehicle 1 is the front (near side). Note that the expression "back side" can be translated as a side far from the vehicle 1. The expression "front side" can be said to mean the side closer to the vehicle 1.

The HUD device 101' is mounted on a vehicle (own vehicle) 1, projects display light K onto a windshield 2 as a projected member, and makes the reflected light enter a viewpoint A of the driver (user of the HUD device). let

This HUD device 101' includes a multi-view 3D display (hereinafter sometimes simply referred to as a 3D display or a stereoscopic display device) 230, a folding mirror (reflection mirror) 174, a concave mirror (curved mirror) 171, and a cover. It includes a glass 119, an exterior 121, and a display control section (not shown).

The stereoscopic display device (3D display) 230 can be configured with, for example, a backlight, a liquid crystal panel as a display section, and a lenticular lens (details will be described later). The display surface 215 of the display unit (liquid crystal panel) is arranged to be inclined with respect to the optical axis of the optical system (including the concave mirror 171 and the folding mirror 174 as components) of the HUD device. In FIG. 1A, the display light K is drawn as a single solid line, and this single line is a principal ray along the optical axis. As shown in the figure, the display surface 215 is not perpendicular to the chief ray (optical axis) but is provided at an angle.

Depending on the degree of inclination, the angle of inclination of the virtual image display surface PS with respect to the road surface (not shown in FIG. 1A, reference numeral 40 in FIG. It is also possible to overlap. Here, the virtual image display surface PS is in an optically conjugate relationship with the display surface 215.

Note that the end U1 of the virtual image display surface PS closer to the driver (in other words, the viewpoint A) is referred to as a "near end", and the end U4 farther away is referred to as a "far end". Further, in FIG. 1(A), three light rays E1 to E3 are drawn as representative light rays connecting the viewpoint A of the driver (user of the HUD device) and the virtual image display surface PS.

The stereoscopic display device (3D display) 230 appropriately controls the display unit (liquid crystal panel) based on the positional relationship with multiple viewpoints assumed at the time of design, and displays each image for the left eye and right eye on the display surface 215. displayed at the same time. As a result, display light for each image on the display surface 215 is generated simultaneously. This means that each display light may be generated from the parallax image (symbol IM0 in the figure) as a stereoscopic image.In other words, the parallax image IM0 is restored by associating the left and right images. (However, in reality, each display light is reproduced, and each display light is not separated and individually progressed to form an image. Therefore, such a parallax image cannot be perceived.) This parallax image IM0 is in an optically conjugate relationship with the observed virtual image (sometimes simply referred to as a virtual image) V0 displayed on the virtual image display surface PS.

In the example of FIG. 1A, the virtual image V0 to be observed is displayed on the virtual image display surface PS, and the two can be seen as one.

Next, refer to FIG. 1(B). The components of the HUD device 101 in FIG. 1(B) are the same as those in FIG. 1(A). However, in FIG. 1B, the parallax image as a stereoscopic image (stereoscopic video) restored by correlating the left-eye and right-eye images displayed on the display surface 215 is larger than that on the display surface 215. This is the IM1 that protrudes to the side from which light is emitted (at a distance from the display surface 215).

As shown in the figure, in this parallax image IM1, the upper end (end point) coincides with or almost coincides with the display surface 215 (in other words, it is assumed that there is a slight gap), and on the other hand, the lower end The portions (endpoints) protrude from the display surface 215 toward the side from which light is emitted, thereby forming an image that forms a surface inclined with respect to the display surface 215 as a whole.

The optical system of the HUD device 101 forms this parallax image IM1 on the imaging plane VT. The imaging plane VT is a virtual plane assumed to be located in front of the virtual image display plane PS. The parallax image IM1 and the imaging plane VT have an optically conjugate relationship.

As illustrated, the front end of the imaging plane VT coincides with or substantially coincides with the near end U1 of the virtual image display surface PS. The far end U5 of the imaging plane VT does not coincide with the far end U4 of the virtual image display surface PS, and is located closer to the driver than U4. The imaging plane VT is a slope whose distance (interval) from the virtual image display plane PS increases (in other words, it moves away from the front side) as it goes from the position U1 to the position U5.

Further, in the figure, the virtual image display surface PS and the imaging surface VT are both drawn as flat surfaces, but they may be curved surfaces. Various curved surfaces can be assumed as the shape of the curved surface, such as a trough-shaped arc surface whose center portion is closest to the road surface 40, for example. These curved surfaces can be adjusted as appropriate by, for example, designing the light reflecting surface of the concave mirror 171 as a free-form surface.

In the example of FIG. 1(B), the virtual image display surface PS and the image forming surface VT match (approximately match) at the near end when viewed from the driver, but the distance (interval) gradually decreases toward the back. begins to open, and the distance (spacing) reaches its maximum at the far end. This change in distance (interval) causes the virtual image (virtual image to be observed) V0' on the virtual image display surface PS to become blurred.

This point will be specifically explained using FIG. 2. FIG. 2 is a diagram for explaining the principle of producing blur in the present invention. In FIG. 2, parts common to those in FIG. 1 are given the same reference numerals. Further, the left eye is written as AL, and the right eye is written as AR. Further, P1, P3, and P6 indicated by white circles are points on the imaging plane VT. P2, P4, P5, P7, and P8 indicated by black circles are points on the virtual image display surface PS.

As described above, in the present invention, the parallax image IM1 is formed on a surface (imaging surface VT) located closer to the driver than the virtual image display surface PS. In other words, an imaging plane VT that is optically conjugate with the parallax image IM1, which is different from the virtual image display plane PS, can be assumed. The optical system of the HUD device 101 is designed to focus the parallax image IM1 on the imaging plane VT, and the display surface 215 is designed to image the parallax image IM1 on the imaging plane VT. Then, images (left eye/right eye images) depicting the display contents are displayed.

Here, as shown in FIG. 2, the imaging plane (virtual plane) VT has a front end (end) at the near end (end near the driver) of the virtual image display surface PS. ) coincides with or substantially coincides with U1, but is arranged so that the far end (end) U5 is separated (toward the near side) from the far end (end farthest from the driver) U4 of the virtual image display surface PS. It is a flat or curved surface on which it is (arranged).

When a driver (user of the HUD device 101) perceives a parallax image with both eyes, each line of sight determined by the convergence angle between the left eye and the right eye is not on the virtual image display surface PS but on the image forming plane VT (in other words, the image forming (a virtual virtual image that is optically conjugate with the parallax image IM1) that is felt to have high clarity.

As a result, the focal points of the left eye AL and the right eye AR are adjusted to the position (stereoscopic position) of the imaging plane. In other words, human perception tends to focus on the imaging plane VT.

However, the light directed toward each of the left eye AL and the right eye AR is emitted from a virtual image display surface PS that is optically conjugate with the display surface 215 of the display section. In other words, it is the display surface 215 of the display unit that actually emits light, and therefore, light comes to the human eye from the virtual image display surface PS, which is optically conjugate with the display surface 215. For this reason, the left eye AL and right eye AR, which have focused on the imaging plane VT, see the virtual image on the virtual image display surface PS located at the back of the imaging plane VT, and as a result, they are out of focus. This means that a blurred virtual image (virtual image V0' on the virtual image display surface PS) is visually recognized (perceived).

On the side closer to the driver, the distance between the virtual image display surface and the image formation surface is not large. The distance between each surface increases as the distance from the driver increases. Therefore, the further away from the driver, the greater the degree of blurring of the virtual image perceived on the virtual image display surface.

In Figure 2, points P1 and P2 overlap (or almost overlap), but points P4 and P5 are slightly apart, and at points P7 and P8, which are farther away, the gap is wider; The degree of blur increases as you go further down. Therefore, the displayed image (virtual image V0') is a naturally blurred image similar to the surrounding background image. Therefore, the driver's discomfort is reduced, and eye fatigue is also reduced.

Next, refer to FIG. FIG. 3(A) is a diagram showing the principle of a 3D HUD device, and FIG. 3(B) is a diagram showing an example of display of a parallax image in the HUD device.

In FIG. 3A, an image for the right eye (parallax image) QR and an image for the left eye (parallax image) QL are displayed on a display surface 211 of a flat panel display (liquid crystal panel, etc.) 210. Note that the "parallax image" is an image that reproduces the parallax (difference between images perceived by each eye) caused by the left and right eyes being in different positions.

When the light emitting side of the display section 210 is the front side, an optical member (indicated by the symbol RS in the example of FIG. 3A) is arranged in front of the display section 210. The optical member RS functions as a light beam separating member, and can be specifically configured with a lenticular lens 220 or a parallax barrier 225, as shown on the upper left side. However, these are examples and are not limited to these. The lenticular lens will be described later.

Further, a parallax barrier is one in which, for example, narrow strip-shaped (rectangular) shielding objects 225a to 225n are arranged at a predetermined pitch in the lateral direction while providing gaps (slits) SL. Even if it is an image, by blocking part of the image display light with a blocking object, different image display light (directional display light) is generated for the left and right eyes. It is similar to a lenticular lens in that it separates light rays for each eye. However, since the light is blocked, the image may become somewhat dark, so lenticular lenses are more advantageous in this respect.

By using a lenticular lens or a parallax barrier, which is said to be the mainstream technology in the current 3D display field, as an optical member, the quality of displayed images can be stably maintained.

The light separated by the optical member RS having a beam separation function (reproduction light E(L1), E(R1) for each eye that reproduces the image) enters the eyes AL and AR located at the light imaging point. When light is emitted, a person can see an apparent three-dimensional image IM at locations where convergence (intersection of light) occurs. In other words, this can also be seen as the stereoscopic image IM being generated by the 3D display. Note that in the example of FIG. 3(A), the convergence angle is θc.

Refer to FIG. 3(B). In FIG. 3(B), an eyebox EB is set in front of a viewer (such as a driver of a vehicle), and an eyepoint EP(C) is located at the center of the eyebox EB. Assuming that virtual imaging planes PS (L) and PS (R) corresponding to the left and right eyes are set in front of the windshield 2, the virtual image V (C) is located in the center of the overlapping area. . The convergence angle of the virtual image V(C) is θd, and the virtual image V(C) is recognized by the viewer (user) as a three-dimensional image.

This three-dimensional virtual image V(C) is displayed (formed) as follows. That is, the optical system of the HUD device includes reproduction lights e(L1) and e(R1) for the left and right eyes of the virtual stereoscopic image IM generated by the 3D display shown in FIG. 3(A). The reflected light is reflected by a curved mirror (concave mirror, etc.) 171 (the number of reflections is at least once), and is thereby projected (projected) onto the windshield 2 as display light E (L1) and E (R1). reaches both eyes of the viewer and forms an image in front of the windshield 2, whereby a virtual image V(C) is displayed (formed).

Next, refer to FIG. 4. FIG. 4(A) is a diagram for explaining reproduction of light rays of a stereoscopic image (parallax image), and FIG. 4(B) is a diagram showing an example of a lenticular lens.

In FIGS. 4A and 4B, a 3D display unit (stereoscopic display unit) 230 includes a display unit (such as a flat panel display) 210 that includes a display surface 215 that displays a parallax image, and a display unit that is in contact with a display unit 2110. , or a lenticular lens 220 as an optical member (or a light beam separation unit) that is arranged close to each other and has a light beam separation function to separate the respective light beams of the left-eye parallax image and the right-eye parallax image.

The lenticular lens 220 includes a plurality of cylindrical lenses F1 to Fn as optical elements arranged (arranged) at a predetermined pitch along the lateral direction (direction W in FIG. 4(B)). It is constructed by forming a periodic lens array structure in the direction. The cylindrical lens (F1 to Fn) as an optical element is a flat surface through which light passes, and a spherical lens (however, an aspherical lens) on the front surface, when the display unit 210 side is the rear side and the opposite side is the front side. It is a vertically elongated cylindrical lens (cylindrical lens). In the example of FIG. 4(A), the curvature of the spherical surface of the lens is uniform.

Specifically, as shown in FIG. 4(B), the cylindrical lenses F1, F2, F3, F4, . . . have a structure in which they are arranged at pitches CW along the lateral direction. This structure constitutes the beam separation section 220. Note that the above-mentioned "pitch" is, for example, the distance from the center position of one cylindrical lens to the center position of an adjacent cylindrical lens.

Note that the above-mentioned “lateral direction W (see FIG. 4(B))” is the horizontal direction in the stereoscopic display device, and this “lateral direction W” is the horizontal direction of the HUD device 101 in the width direction of the vehicle 1 (horizontal direction, This is the direction corresponding to the X direction). Further, the "vertical direction H (see FIG. 4(B))" is a direction orthogonal to the horizontal direction, and is a direction corresponding to the height direction (Y direction) of the vehicle 1 of the HUD device 101.

The display unit 210 displays pixels L (L1 to Ln) of the image for the left eye (parallax image) and pixels R (R1 to Rn) of the image for the right eye (parallax image) in the horizontal direction on the display surface 215. , has a configuration in which a two-dimensional image surface (pixel display surface or pixel matrix) consisting of a plurality of pixels is formed by arranging them alternately to form pixel rows and also arranging the pixel rows in the vertical direction. (See also Figure 5).

In FIG. 4A, each of the left-eye pixels (L pixels) L1 to Ln is arranged (formed) at a position corresponding to the left half of each of the cylindrical lenses F1 to Fn as optical elements. Each of the right-eye pixels (R pixels) R1 to Rn is arranged (formed) at a position corresponding to the right half of each of the cylindrical lenses F1 to Fn as optical elements. Note that one pixel further includes R (red), G (green), and B (blue) subpixels.

As explained earlier with reference to FIG. 3A, if the human eyes AL and AR are located at the light imaging points 911 and 913 in front of the 3D display unit 230, then the light rays will be located at the point where the light rays converge. , the stereoscopic image IM can be visually recognized. In FIG. 4A, E(L4) to E(L6) are shown as the reproduced lights of the left-eye pixels L4 to L6, and E(R4) to E(R6) are shown as the reproduced lights of the right-eye pixels R4 to R6. )It is shown.

Next, refer to FIG. 5. FIG. 5 is a diagram showing an example of the configuration of a control unit (display control unit) and an example of a pixel configuration in the display unit (flat panel display).

In FIG. 5 , the display control unit 300 includes an image generation unit (left eye/right eye image generation unit) 310 . The display control unit 300 controls the image generation unit 310 to display a first display target (for example, in FIG. A left-eye image GL and a right-eye image GR (these are collectively referred to as a first image) of the vehicle speed display image are displayed.

Further, a second real image display area G (Z2') of the display surface 215 of the display section 210 or both of the first and second real image display areas G (Z1') and G (Z2') The left-eye image GLb and the right-eye image GRb (these are collectively referred to as second images) of the second display target (for example, the image of the navigation arrow or the image of the sign in FIG. 1(A)) are displayed. Note that both G (Z1') and G (Z2') are included because, for example, the navigation arrow extends over a wide range from the near end side to the far end side of the virtual image display surface PS. This is done in consideration of the fact that figures, etc., will be displayed.

Further, in FIG. 5, on the display surface 215 of the display unit 210, pixels PX (RGB) consisting of RGB sub-pixels are arranged in the row direction (horizontal direction) and the column direction (vertical direction). A two-dimensional pixel surface (image display surface or pixel matrix) is formed.

Next, refer to FIG. FIG. 6 is a diagram showing an example of the configuration of a HUD device mounted on a vehicle, and an example of a virtual image display surface and an imaging surface. In FIG. 6, parts common to those in FIG. 1 are given the same reference numerals.

In FIG. 6, a HUD device (stereoscopic HUD device) 101 includes a stereoscopic display device (3D display) 231 as an image generation source. As described above with reference to FIG. 1, the stereoscopic display device 231 has a function of generating light for reproducing a parallax image as a stereoscopic image, and includes a display unit (for example, a flat panel display) 210 having a display surface; A lenticular lens 220 is disposed in contact with or in close proximity to the display section 210 and is an optical member having a light beam separation function of separating each light beam of each image for the left eye/right eye, and the image display on the display section 210. It has a display control section 300 for controlling. Note that a three-dimensional display section (3D display section) 230 is configured by the display section 210 and the lenticular lens 220 as an optical member. Note that the height of the stereoscopic display device 231 is H1, and the height can be kept low compared to the light projecting section of a 2D HUD device using a screen. This contributes to downsizing of the HUD device 101.

In FIG. 6, three light rays e1, e2, and e3 (display light K) are shown as light rays emitted from the stereoscopic display device (3D display) 230.

The display lights e1 to e3 are transmitted at least once (two times in total in FIG. 6) by the optical system 52 of the HUD device 101 (including a folding mirror 174 and a curved mirror (concave mirror, magnifying mirror) 171 as a reflecting member). After being reflected, it is projected onto the windshield 2. Note that each of the three light rays E1 to E3 incident on the driver's viewpoint A corresponds to each of the display lights e1 to e3.

Further, the reflecting mirror (returning mirror) 174 is a mirror that reflects light and is made of molded resin such as polycarbonate and metal such as aluminum vapor-deposited thereon. The curved mirror (concave mirror) 171 is a mirror made of resin, such as polycarbonate, molded to have a concave surface (which may be a free-form surface), and metal, such as aluminum, deposited on it, and functions as a kind of magnifying glass. By projecting the display lights e1 to e3 toward the windshield 2, an enlarged image (video) is projected. The cover glass 176 is a sheet made of transparent resin, such as polycarbonate. Moreover, the exterior 121 is a housing that houses the components of the HUD device.

In addition, in the configuration of FIG. 6, the curved mirror 171 can be rotated by the rotating part (actuator) 175 to adjust the inclination as appropriate. Further, the inclination of the stereoscopic display section (3D display section) 230, etc. can also be adjusted by the adjustment section (actuator) 173.

Further, as shown on the left side of FIG. 6, a first virtual image V1 and a second virtual image V2 are displayed on the virtual image display surface PS. The first and second virtual images V1 and V2 are in an optically conjugate relationship with the parallax image IM3.

Here, the range with a predetermined width expressed as PD is the range of allowable depth of focus, and if the focal depth deviation falls within this range PD, the driver's (user's) eyes will notice that the image formation is The shift is not noticeable and the out-of-focus is virtually imperceptible.

The area U1 to U2 (first area Z1) on the virtual image display surface PS is within the range PD. Therefore, the first virtual image V1 located in this range PD is a clear image with less noticeable defocus. This first virtual image V1 may be, for example, a display that requires accuracy in presenting information (vehicle speed display, etc.).

On the other hand, the area U2 to U4 (second area Z2) is outside the range PD, and therefore, the user perceives the virtual image V2 located in the second area Z2 to be out of focus (blur). Examples of the second virtual image V2 include a display of an arrow for navigation, a display of a sign located far away, and the like.

In the example of FIG. 6, the starting point is the visual reference point (driver's viewpoint A, or a predetermined point on the vehicle 1 instead of this) for each part (each point) of U1, U2, U3, and U4. The distances (virtual image display distances) are L1, L2, L3, and L4. In particular, in the range of L2 to L4, as the virtual image display distance increases, the amount (degree) of blur (out of focus) also increases, and natural blur (blur) of the virtual image is realized according to the distance.

Next, refer to FIG. FIG. 7 is a diagram illustrating an example of a virtual image viewed by a user through a windshield.

Vehicle 1 is traveling on a straight road. The driver can visually recognize the side lines 51 and 53 of the road, the center line 55, and the traffic light 71 as a real scene (background) through the windshield (windshield, combiner, etc.).

Further, the vehicle 1 is provided with a steering wheel (steering handle in a broad sense) 7, and an operating section 9 is provided near the steering wheel 7, which can turn on/off the HUD device, set the operation mode, etc. There is. Further, a display device (for example, a liquid crystal display device) 13 is provided at the center of the front panel 11. The display device 13 can be used, for example, to assist display by a HUD device. Note that this display device 13 may be a composite panel having a touch panel or the like.

The virtual image is displayed in a virtual image display area 3 within the windshield 2. The virtual image display area 3 is determined according to the vertical viewing angle and the horizontal viewing angle of the stereoscopic display device (3D display).

In addition, in FIG. 7, the end of the virtual image display surface PS closer to the vehicle 1 is referred to as a near end (indicated by point U1), and the end on the far side is referred to as a far end (indicated by point U4). do. In addition, the center position of the reference virtual image V0 (indicated by point U3), and the boundary position (indicated by point U2) separating the first area Z1 and second area Z2 between U1 and U3. There is. The area U1 to U2 is defined as a first area Z1, and the area U2 to U4 is defined as a second area Z2. In addition, in the figure, the first and second regions Z1 and Z2 are shown by broken elliptical lines for convenience.

Further, in FIG. 7, a vehicle speed display (display of "50 km/h") SP as the first virtual image V1 is displayed on the near side. On the back side, there is a virtual image 69 of a navigation arrow extending in the traveling direction of the vehicle 1 along the road surface 40 (for example, superimposed on the road surface 40), and a virtual image 65 of a sign (traffic sign) indicating a speed limit. is displayed. These are examples of the second virtual image V2. The sign 65 is displayed with natural blur, and there is no visual discomfort when compared with the traffic light 71, which is a real scene.

Further, when the end of the virtual image 69 of the arrow near the vehicle 1 is defined as the near end J1 and the end far away is defined as the far end J2, the distance from the vehicle 1 ( It is also possible to gradually increase the "blurring amount" according to the virtual image display distance). Note that the manner in which the "blur amount" increases may be a continuous increase according to the distance (virtual image display distance) or a stepwise increase.

Next, refer to FIG. 8(A) and 8(B) are diagrams showing display examples when a virtual image is displayed so as to stick to the road surface, and FIG. FIG.

In the example of FIG. 8(A), the virtual image display surface PS extends horizontally overlapping the road surface 40. In the example shown in FIG. This makes it possible to display an image superimposed on the road surface (display of a road surface superimposed image). Note that the virtual image display surface PS may be entirely (or partially) located below the road surface 40. Even if the virtual image display surface is located below the road surface, people know that the image will not be below the road surface, so in the above case, people will perceive the virtual image as being stuck to the road surface. Become. Therefore, it is possible to display a display that overlaps the road surface without any gaps.

In FIG. 8(B), the virtual image display surface PS is set to be slightly inclined near the road surface 40. When it is better to suppress the far end from rising from the road surface, a part of the virtual image display surface PS (near the near end) may be positioned below the road surface 40.

In the example of FIG. 8(C), in the virtual image display area 3 of the windshield 2, the vehicle speed display SP (first virtual image V1) is displayed on the right side of the first area Z1, and the first A navigation arrow 71 (including first and second virtual images V1 and V2) extending along the traveling direction of the vehicle 1 from the area Z1 to the back side of the second area Z2 and prompting a left turn is displayed. There is.

The vehicle speed display SP has high clarity and excellent visibility. Further, the navigation arrow 71 has a base end 71a on the side closer to the vehicle 1, and a tip end 71b on the far side. The proximal end 71a is displayed clearly, the distal end 71b is displayed blurred according to the distance, and in the area between 71a and 71b, the display is naturally blurred according to the distance, giving a natural perspective. Displays with a sense of feeling have been realized over a fairly wide range of areas. Note that Z1 indicates a first display area, and Z2 indicates a second display area.

In the example of FIG. 8(D), a vehicle guidance display 73 (including first and second virtual images V1 and V2) is displayed superimposed on the road surface 40. The display 73 for vehicle guidance has a base end 73a and a tip end 73b, and 73a is displayed clearly, and the amount of blur increases from 73a to 73b, so that eye fatigue is reduced and distance is improved. A display with an excellent feel is realized.

In the example of FIG. 8E, a sign 75 is displayed in the far upper right corner, and a circular mark 78 indicating an expressway exit 77 is displayed on the left side in front of the sign 75.

Furthermore, at a certain point in time, a vehicle guidance sign 79 indicating an exit (EXIT) is superimposed on the road surface 40 and displayed in the second region Z2. As time passes (in other words, as the vehicle 1 advances), the sign 79 moves closer to the vehicle 1, in other words, toward the first region Z1. As the sign 79 moves, the degree of blurring of the sign 79 gradually decreases and its sharpness increases, giving the user a natural vision.

On the other hand, there is a circular mark 78 indicating the exit (exit) 77 of the expressway, but if the user is unable to enter at exit 77 and passes by, the user will have to go to the next exit and come back again, which is a huge burden. Therefore, this driving scene is a driving scene with high severity (or urgency).

Here, if it is better to display the circular mark 78 clearly even if the exit 77 is far away, the display control unit 300 performs image processing on the circular mark 78 individually. , image processing (display control to suppress blur) may be performed to create a clear virtual image without blur.

In principle, natural blurring is achieved for distant displays, but in some cases, such blurring may not be necessary. For example, in the case of important driving scenes such as those mentioned above, or when displaying a caution mark to notify of an obstacle in the distance (in the case of danger warning), or when notifying an exit of an expressway. This is the case for highly important displays such as. In such a case, the display control unit 300 performs individual image processing to suppress blurring and perform correction to increase sharpness. This can prevent any negative effects from occurring. Even in this case, since the image processing is done individually, the load on the image processing software and hardware does not increase significantly, so no problem occurs.

Next, refer to FIG. FIG. 9(A) is a diagram showing an example of a system configuration of a HUD device, and FIG. 9(B) is a diagram showing an example of a configuration of a display control section.

The system shown in FIG. 9A includes a display control unit (display control device) 300 included in the control unit 290, an object detection unit 801, a vehicle information detection unit 803, and the system shown in FIGS. It includes the illustrated stereoscopic display device 230 (including the display section (display) 210), a first actuator 177, and a second actuator 179.

The display control unit (display control device) 300 includes an I/O interface 741, a processor 742, and a memory 743. The display control unit (display control device) 300, the object detection unit 801, and the vehicle information detection unit 803 are connected to a communication line (BUS, etc.).

Further, the first actuator 177 and the second actuator 179 can be used as the rotating section (rotating mechanism) 175 and the adjusting section 173 shown in FIG. These can also be called an optical system or an adjustment system for the display section.

Further, the object detection unit 801 can be configured with, for example, an external sensor, an external camera, etc. provided in the vehicle 1. The vehicle information detection unit 803 may include, for example, a speed sensor, a vehicle ECU, an external communication device, a sensor that detects the position of the eyes, a yaw rate sensor that detects the pitch angle (inclination angle) of the vehicle 1, or a height sensor. It can be configured by The display control unit (display control device) 300 performs, for example, image processing to individually adjust the degree of blurring of the display target based on the detection information of the target object detection unit 801 and the information from the vehicle information detection unit 803. It is preferable to implement this method to achieve both display of appropriate perspective and reliable notification of information to the user.

Further, one or more processors 742 may, for example, acquire positional information on the road surface 40, drive at least one of the first and second actuators 177 and 179 based on the acquired information, and drive the virtual image. It is also possible to adjust the display position, etc.

Refer to FIG. 9(B). As shown in FIG. 9B, the display control unit (display control device) 300 includes an image generation unit (left eye/right eye image generation unit) 310, an image storage unit (image database) 312, and a left eye image generation unit (image generation unit for left eye/right eye). It has an image buffer 332, a right eye image buffer 334, and an image interface (I/F) 336. The image storage unit (image database) 302 stores parallax image samples and the like corresponding to the virtual image display distance for the display target. The image generation unit 310 reads out the parallax image sample, makes fine adjustments as appropriate, and generates a parallax image to be displayed. The parallax images are temporarily stored in the image buffers 332 and 334 for the left and right eyes, and then the left-eye parallax image GL and the right-eye parallax image GR are displayed on the display unit (display) via the image I/F 336. 210.

The vehicle 1 is also equipped with a pupil detection camera 900 that captures images of the user's eyes, and a viewpoint position detection unit 902 that detects the user's viewpoint position (see FIG. 9 for the overall configuration). Information on the viewpoint position detected by the viewpoint position detection unit 902 is supplied to the image generation unit 310 as appropriate. The image generation unit 310 can finely adjust each image for the left eye/right eye based on the information on the viewpoint position.

Next, refer to FIG. FIG. 10 is a diagram showing an example of the overall configuration of the HUD device. The same parts as in the previous figure are given the same symbols. Further, although an optical system 52 is provided in FIG. 10, the same configuration as that shown in FIG. 1(B) and FIG. 6 above may be adopted as the configuration of this optical system 52. The same applies to the stereoscopic display device 231.

In the example of FIG. 10, an optical system 52, a stereoscopic display device 231, a driving scene determination unit 19 having an image processing unit 21 that performs image processing based on an image captured by the front imaging camera 17, and a navigation unit (navigation ECU) 400 are provided.

The display control unit (control unit) 300, together with an image interface (I/F) 336, a drive unit 33, a virtual image display position control unit 34, and an image generation unit 310, determines the appropriate resolution of the display target and performs the A display target attribute determining unit 36, which determines which of the first and second virtual images is preferable to display, or determines its importance, urgency, etc., and a various information acquisition unit 39 (vehicle a pitch angle acquisition unit 38 that acquires the pitch angle of 1 by calculation or the like.

Further, the pupil detection camera 900 images the eyes of the driver (user) 22, and the viewpoint position detection unit 902 detects the viewpoint position of the driver 22 based on the pupil imaging information. Information on the detected viewpoint position is supplied to the image generation unit 310 as appropriate.

The navigation unit (navigation ECU) 400 includes a depth mapping unit 402, a navigation information (road guide information, road sign information, etc.) generation unit 404, a driving route information acquisition unit 406, an own vehicle position information acquisition unit 408, and a map generation unit 404. It includes an information acquisition section 410 and a storage section 412 (functioning as a database of maps, road guide information, road signs, etc.). The navigation unit (navigation ECU) 400 is supplied with vehicle information and the like collected by the in-vehicle ECU 700 via a bus (BUS).

Further, the communication unit 500 may transmit various information acquired through wireless communication with a driving support system 600 installed outside the vehicle 10 (or an ADAS system installed in another vehicle, etc.) as appropriate to the navigation system. The information may be supplied to the own vehicle position information acquisition section 408 and the map information acquisition section 410 of the section 400. Further, the position information etc. received by the GPS reception unit 502 from the GPS satellites may be supplied to the host vehicle position information acquisition unit 408 and the map information acquisition unit 410 of the navigation unit 400 as appropriate.

The vehicle 1 is also provided with various sensors 505 (including a yaw rate sensor for pitch angle detection, etc.). Further, various types of information collected by the in-vehicle ECU 700 are supplied to the navigation section 400 via the BUS, and some of the various information (indicated by reference numeral J0) is transmitted to the pitch angle acquisition section 38 and various information acquisition section 38. It is also supplied to section 39. The information J0 can also include danger information in front, behind, around the vehicle, etc. in the current driving scene, and the results of determining the importance of information that should be reported to the driver.

The display control unit 300 refers to the information on the degree of danger and the degree of importance, and increases the resolution (clarity) of a display regarding an event with a high degree of danger or importance, regardless of the distance of the display. Accurate and prompt information provision to the driver may be realized by performing special emphasis processing. Further, when it is determined that the driver's visibility is lower than usual due to bad weather, image processing such as increasing the clarity of the virtual image display can be performed as appropriate.

In the display control unit 300, the pitch angle acquisition unit 38 included in the various information acquisition unit 39 determines the pitch angle of the vehicle 1 based on the image information supplied from the image processing unit 21, the information of various sensors supplied from the in-vehicle ECU 700, etc. The current pitch angle (in other words, the inclination of the vehicle 1) of the vehicle 1 is calculated.

Further, when it is determined that the vehicle 1 is approaching an uphill slope (or a downhill slope), for example, based on information provided from the driving scene determination unit 19, the virtual image display position control unit 34 adjusts the pitch angle, etc. Taking this into consideration, the display position of the virtual image (relative position to the road surface) is adjusted (corrected). Furthermore, the display position of the virtual image is adjusted as appropriate based on the depth information of the information image (navigation information, etc.) to be displayed, which is supplied from the navigation unit (navigation ECU) 400.

The image generation unit 310 generates left-eye/right-eye images to be displayed on the display surface 215 based on various input information. Each generated image is supplied to the image I/F 336. The image I/F 336 supplies data cv of the parallax image (original parallax image) to the display unit 210 (see FIG. 6) of the stereoscopic display device 231. Further, the drive unit 33 supplies, for example, a control signal rvs for rotating the curved mirror (concave mirror) 170 to an actuator (for example, at least one of the reference numerals 173 and 175 in FIG. 6).

Next, refer to FIG. 11. FIG. 11 is a flowchart illustrating an example of the procedure of display processing by the display control unit.

First, the pitch angle of the vehicle is acquired (step S1). Next, the position of the virtual image display surface is adjusted (position corrected) in consideration of the pitch angle (tilt angle) of the vehicle, etc. (step S2). Next, each image for the left eye/right eye is displayed on the display surface of the display unit, in which images are drawn on the assumption that the images will be formed in front of the virtual image display surface (step S3).

As described above, according to the embodiments of the present invention, it is possible to provide a HUD device that can reduce eye fatigue of a driver.

For example, even if a display that is near and far from the host vehicle is displayed at the same time so that the user can compare and contrast them, the clarity of the display is not uniform, and the display varies depending on the distance. The blurred display can be visually recognized without causing any discomfort, and it is also possible to reduce eye fatigue.

In addition, even when one display approaches the own vehicle over time (display movement control), the user can compare the past display with the current display, so in the above case However, according to this embodiment, a natural sense of perspective can be obtained, and the same effect as in the above case can be obtained, and no particular problem occurs.

Furthermore, according to the embodiments of the present invention, by using both a high-definition display and a naturally blurred display, a variety of displays are possible, and the expressive power (or production power) of the HUD device is improved. is also possible.

In this specification, the term vehicle can also be broadly interpreted as a vehicle. In addition, terms related to navigation (for example, signs, etc.) shall be interpreted in a broad sense, taking into account, for example, the perspective of navigation information in a broad sense that is useful for vehicle operation. Further, HUD devices include those used as simulators (for example, aircraft simulators). Further, the types of the display section and optical members are not limited to those in the above embodiments, and various types can be adopted.

The invention is not limited to the exemplary embodiments described above, and those skilled in the art will be able to easily modify the exemplary embodiments described above to the extent that they fall within the scope of the claims. .

DESCRIPTION OF SYMBOLS 1...Vehicle (own vehicle), 2...Projected member (windshield, etc.), 3...Virtual image display area, 7...Steering wheel, 9...Operation unit, 11...Front Panel, 13...Display device (display panel, etc.), 17...Front imaging camera, 19...Driving scene determination unit, 21...Image processing unit, 22...User, 336...Image I /F, 33...Drive unit, 34...Virtual image display position control unit, 310...Image generation unit, 36...Display target attribute determination unit, 38...Pitch angle acquisition unit, 39... - Various information acquisition units, 40... Road surface, 52... Optical system of HUD device, 101... HUD device (stereoscopic HUD device), 210... Display unit (flat panel display, etc.), 220... Optical member, (lenticular lens, light beam separating section, lenticular lens section), 230... Stereoscopic display section (3D display section), 231... Stereoscopic display device (3D display), 171... Curved surface Mirror (concave mirror, etc.), 290... Control unit, 300... Display control unit (control unit or display control device), 400... Navigation unit (navigation ECU), 500... Communication unit, 502. ...GPS receiving unit, 505...Various sensors, 600...Driving support system, 700...In-vehicle ECU, 902...Viewpoint position detection unit, RS...Optical member (stereoscopic optical member), V1 ...first virtual image, V2...second virtual image, VT...imaging plane, GL...image for left eye, GR...image for right eye

Claims (6)

A head-up display (HUD) device that is mounted on a vehicle and projects an image onto a projection member provided in the vehicle to allow a driver to visually recognize a virtual image of the image,
a display unit including a display surface that displays images for the left eye and for the right eye;
an optical member that is disposed in contact with or in close proximity to the display section and has a light beam separation function that separates each light beam of each image for the left eye/right eye;
an optical system including an optical member that reflects display light of the image and projects it onto the projection target member;
a display control unit that controls image display on the display unit;
has
The display surface of the display section is arranged obliquely with respect to the optical axis of the optical system,
The virtual image display surface, which is optically conjugate with the display surface, has a distance between the far end, which is the end farthest from the driver, and the road surface, and the near end, which is the end near the driver. A plane or curved surface arranged at an angle with respect to the road surface so as to be larger than a distance from the road surface, or a plane or curved surface arranged so as to be superimposed on the road surface,
An imaging plane that is optically conjugate with the parallax image obtained based on the left-eye/right-eye images is located closer to the driver than the virtual image display plane, and is located closer to the driver than the virtual image display plane. A flat or curved surface in which the distance from the front increases from the front to the back ,
The display control unit performs display control assuming that the parallax image is imaged on the imaging plane when displaying the left-eye/right-eye images on the display surface.
A head-up display device characterized by: The degree of blur in a second region located closer to the far end than the first region is greater than the degree of blur in the first region located closer to the near end on the virtual image display surface. The head-up display device according to claim 1, characterized in that: is large. As the virtual image display distance, which is the distance between the virtual image displayed on the virtual image display surface and the driver's viewpoint or a predetermined reference point of the vehicle, increases, the degree of blur in the virtual image also increases. The head-up display device according to claim 1 or 2, characterized by: The display control unit displays a virtual image of a display target for which it is important to accurately convey information to the driver in an area with a low degree of blur on the virtual image display surface,
The head-up display device according to claim 2 or 3, characterized in that a virtual image of a display target for which it is important to provide the driver with a sense of discomfort is displayed in an area where the degree of blur is high. . 5. Any one of claims 1 to 4, wherein the display control unit executes display control on the virtual image display surface such that the displayed virtual image moves closer to the vehicle over time. Head-up display device as described in Section. The display control unit reduces the degree of blurring when the virtual image displayed in the area of the virtual image display surface where the degree of blurring is high is determined to have a higher degree of urgency or importance than usual. The head-up display device according to any one of claims 1 to 5, wherein the head-up display device performs display control to perform display control.

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