JP2021051231A - Head-up display device - Google Patents

Abstract

To attain more natural visibility with perspective of a virtual image without increasing the burden of the display control part when displaying the virtual image using a virtual image display surface with an inclined plane.SOLUTION: A virtual image display surface PS1 is a flat or curved surface that is inclined with respect to a road surface 40. Optical mismatch is provided between a display part 161 serving as one optical member and other optical members 171 and 174 so that the blurring level in a second zone Z2 positioned nearer to the far end U4 side of the virtual image display surface than a first zone Z1 positioned nearer to the near end U1 is higher than the blurring level in the first zone Z1. A display control part 300 displays a first image in a first real image display zone Z1' corresponding to the first zone on a display surface 164 of the display part and displays a second image that is different from the first image in both a second real image display zone Z2' corresponding to the second zone or both the first and second real image display zones.SELECTED DRAWING: Figure 1

Description

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

For example, Patent Document 1 describes a technique in which a virtual image display surface, which is an image forming surface, is an inclined surface that is inclined by a predetermined angle with respect to a road surface.

Further, in order to realize a virtual image display with a sense of perspective, a technique is described in which the image generation unit performs a blurring process on the edge portion or the entire edge portion of the virtual image.

Japanese Unexamined Patent Publication No. 2018-12141 (for example, FIG. 1, [0014]) Japanese Unexamined Patent Publication No. 2017-81428 (for example, FIGS. 4 (c), 5 (c), [0995] to [0998])

The present inventor has recognized the new issues described below.

In Patent Document 1, a virtual image display surface, which is an inclined surface, can be used to perform display with enhanced expressiveness in the depth direction (front-rear direction of the vehicle). However, the sharpness of the virtual image by the conventional HUD device is constant regardless of whether the display target is far or near from the user (driver or the like) of the HUD device.

On the other hand, for example, among the actual scenes (scenery seen through the windshield, which is a windshield), those in the distance are visually blurred (in other words, they are out of focus).

Therefore, the virtual image displayed by the HUD device may be clearly visible to the user rather than the actual landscape. It is undeniable that if such a state continues for a long time, the user may feel visually tired, for example.

In order to alleviate this problem, when displaying a virtual image, for example, the amount of blurring is set to correspond to the virtual image display distance (imaging distance), and the blurring process is appropriately performed by using the technique of Patent Document 2. Can be considered.

However, in this case, a new problem arises in which the burden on the display control unit that controls the display of the image increases. The above problems have been clarified by the examination of the present inventor.

An object of the present invention is to realize more natural and perspective visibility of a virtual image without increasing the burden on the display control unit when displaying a virtual image using a virtual image display surface having an inclined surface. ..

Other objects of the invention will become apparent to those skilled in the art by reference to the embodiments and best embodiments illustrated below, as well as the accompanying drawings.

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

In the first aspect, the head-up display device is
A head-up display (HUD) device that projects display light onto a reflected light-transmitting member provided on a vehicle and generates and displays a virtual image by the light reflected by the reflected light-transmitting member.
Other than the display unit, the display unit as one optical member having a display surface for displaying an image and at least one reflection member for reflecting light corresponding to the image formed on the display surface. Optical members, including optical systems,
A display control unit that controls the display of the virtual image,
Have,
The virtual image display surface as the image plane of the virtual image is a flat surface or a curved surface inclined with respect to the road surface of the road.
When the end of the virtual image display surface on the side close to the vehicle is the near end and the end on the far side is the far end, the first region of the virtual image display surface located on the near end side. The display unit as one optical member and the display unit so that the degree of blurring of the second region located on the far end side is larger than the degree of blurring of the first region. There is an optical mismatch with other optical members,
The display control unit
The first image is displayed in the first real image display area corresponding to the first area on the display surface of the display unit, and the second real image display area corresponding to the second area or the first real image display area is displayed. A second image different from the first image is displayed in both the first and second real image display areas.

According to the first aspect, due to the optical mismatch in the optical system, for example, a virtual image near the own vehicle is clearly displayed, and a virtual image far away naturally causes a "blurring amount" corresponding to the virtual image display distance. It is possible to easily realize control such as increasing the number to display. The degree of blurring can be adjusted regardless of image processing, and the burden on the display control unit does not increase at all.

Further, when displaying a virtual image using a virtual image display surface (imaging surface) of an inclined surface, the virtual image display distance (imaging distance) can be adjusted according to the display position, and the virtual image display distance can be adjusted together with the adjustment of the virtual image display distance. The amount of blur is also adjusted automatically. Therefore, it is possible to realize more natural and perspective virtual image visibility at low cost.

Further, in this embodiment, a display unit having a display surface is one optical member, and a configuration (structure) including at least one reflection member that reflects the display light of an image is another optical member. As the other optical member, for example, a configuration including a concave mirror (curved surface mirror) and, if necessary, another reflector can be assumed. In this case, at least one of the arrangement of the concave mirror and other reflectors (relative positional relationship of the display unit with respect to the display surface) and the shape of the reflecting surface that reflects light is normal (when there is no optical deviation). By changing with, an optical shift can be intentionally caused.

In addition, a correction mirror or a correction lens may be interposed to introduce a focus error. In this case, the concave mirror and other reflecting mirrors may be arranged and shaped in the same manner as in the normal case, and the correction mirror (correction lens) may cause an optical deviation. Such design changes can be made as appropriate.

Further, the display control unit distinguishes, for example, a first region (a region closer to the own vehicle) and a second region (a region farther than the first region), and the first region includes, for example, sharpness. On the other hand, in the second area, a sign in the distance and an arrow for navigation extending from a position close to the own vehicle to a considerable distance are displayed (arranged). ), Etc. to implement image display control.

Specifically, for example, the display position of the image on the virtual image display surface of the inclined surface is adjusted, and at this time, the size of the display target is changed or the presence or absence of shading is adjusted as necessary to give a sense of perspective. It is also possible to perform processing such as emphasizing. At this time, it is possible to generate a natural blur in the distant virtual image without performing a special blurring process.

In the second aspect, which is subordinate to the first aspect,
The other optical member of the other optical member so as to obtain an image within the allowable depth of focus on the virtual display surface of the virtual display unit, which is different from the display surface of the display unit as one optical system. The optical mismatch may be realized by adjusting the characteristics.

In this aspect, assuming a virtual display surface (a surface different from the actual reference surface) of the virtual display unit, the characteristics of other optical members (characteristics of a plurality of elements are integrated and integrated). The characteristics of one optical system) are adjusted so that an appropriate image formation within the allowable depth of focus can be obtained (in other words, a clear virtual image can be obtained) with respect to the image displayed on the virtual display surface. To.

For example, by arranging the virtual reference surface and the actual display surface so that one end coincides with the other end and the other ends differ, there is not much difference in the positions of the display areas of the two display surfaces on the one end side. A virtual image that is generally in focus can be displayed at a location in the vicinity thereof, while a difference in the positions of the respective display surfaces becomes large on the other end side, resulting in a difference in the focusing position.

For example, if each display surface is flat, the difference in position increases and the defocusing increases as the display surface moves from one end to the other end. Therefore, by setting the first real image display area on one end side and setting the second real image display area on the other end side, the distance from one end with respect to the image arranged in the second real image display area. It is possible to display a virtual image with a natural perspective, which has a "blurring amount (degree of defocusing)" according to the above. In particular, since it is possible to "adjust the amount of blurring" that continuously changes with respect to the virtual image display distance without performing any electrical processing, the HUD device with less burden on the image processing software is low. It can be provided at a cost.

In the third aspect, which is subordinate to the first or second aspect,
On the virtual image display surface, the degree of blurring of the virtual image may be increased as the virtual image display distance of the virtual image is increased.

According to this aspect, in particular, "adjustment of the amount of blurring" that continuously changes with respect to the virtual image display distance becomes possible without any electrical processing, and a natural and natural virtual image display is possible. is there. Further, if the size of the virtual image, the shape of the shadow, and the like are appropriately adjusted in accordance with the virtual image display distance, the visibility with a natural perspective can be further realized.

In the fourth aspect, which is subordinate to any one of the first to third aspects,
The first image is an image in which it is important to accurately convey the information contained in the first image to the user of the head-up display device.
The second image may be an image in which it is important to give the user a comfortable visual sense.

In this embodiment, the image in which the accuracy of information transmission is emphasized is set as the first image (the image corresponding to the virtual image displayed on the near side of the own vehicle), and the visual sense without discomfort is given (visuality without discomfort). ) Is regarded as the second image (the image corresponding to the virtual image displayed on the distant side of the own vehicle).

As the first image, for example, characters, icons, and the like showing vehicle information, information around the vehicle, navigation information, and the like can be given. Specifically, vehicle speed display, road speed limit information, turn-by-turn information (for example, intersection name information, POI (specific point on map) information, etc.) can be exemplified.

These are required to have accurate display or quick cognition, and since the vehicle speed display is often displayed at all times, it is displayed in a focused virtual image on the front side of the user in an easy-to-see manner. Is preferable, so it is preferable to include it in the first image.

In addition, for example, the figure of the arrow related to the progress of the own vehicle or another vehicle, and the information including the figure other than the arrow are mainly the figures, so that the intuitive graspability and the distance information can be obtained without discomfort. is important. Further, it is preferable that a sign or the like located far away is displayed with a blur amount that matches the degree of blurring of the surrounding actual scene so as not to cause a sense of discomfort to the user. In addition, arrow information as a route guide, colored graphic information indicating a frozen road surface area, or ADAS (advanced driver assistance system) information that supports the operation of the steering wheel and equipment of the driver who is the user is also available. The same is true.

Therefore, these are included in the second image, and the area on the inner side of the virtual image display surface (inclined surface) is used to display a display having a sense of depth and being appropriately out of focus. As a result, it is possible to realize an appropriate visual display without eye fatigue.

In the fourth aspect, which is subordinate to any one of the first to third aspects,
The virtual image display control unit so that the virtual image approaches the vehicle over time on the second region of the virtual image display surface or on the region where the first and second regions are combined. Display control to move may be executed.

In this embodiment, when the display of the virtual image is controlled so as to approach the own vehicle with the passage of time, the amount of blurring (out-of-focus amount) is automatically and appropriately adjusted according to the position of the virtual image. It is possible to easily realize a dynamic display without a sense of discomfort. In other words, users may find it unnatural that the sharpness is uniform regardless of the perspective of the virtual image. According to this aspect, the visibility is not deteriorated because the natural blurring occurs. In addition, as a mode in which the movement display control of this mode is performed, for example, when various navigation displays are moved on the road surface according to the progress of the vehicle, or a sign indicating a speed limit is displayed from a distance to a near distance. There are cases where it is moved to.

Those skilled in the art will readily appreciate that the embodiments according to the present invention exemplified may be further modified without departing from the spirit of the present invention.

FIG. 1 (A) is a diagram showing an example of a virtual image visually recognized by a user through a windshield, and FIG. 1 (B) is an example of a configuration of a HUD device mounted on a vehicle, an example of a virtual image display surface, and an example of a virtual image display surface. It is a figure which shows an example of the arrangement of the virtual image display surface which intentionally causes optical inconsistency. FIG. 2A is a diagram showing a more detailed configuration example of the optical system of the HUD device shown in FIG. 1B, and FIG. 2B is a first and second view on the display surface of the display unit. FIG. 2C is a diagram showing an example in which the real image display area is provided, and is a diagram showing a suitable shape example of the virtual image display surface when the virtual image display surface is a curved surface. 3A and 3B are diagrams showing an example of an image (real image) displayed in the first and second real image display areas on the display surface of the display unit. 4 (A) and 4 (B) are views showing an example of a virtual image display surface when displaying a virtual image so as to stick to the road surface, and FIGS. 4 (C) to 4 (E) are visually recognized by the user through a windshield. It is a figure which shows another example of a virtual image. FIG. 5 is a diagram showing an example of the system configuration of the HUD device. FIG. 6 is a diagram showing an example of the overall configuration of the HUD device. FIG. 7 is a flowchart showing an example of the procedure of display processing by the display control unit.

The best embodiments described below have been used to facilitate understanding of the present invention. Therefore, one of ordinary skill in the art should note that the present invention is not unreasonably limited by the embodiments described below.

See FIG. FIG. 1 (A) is a diagram showing an example of a virtual image visually recognized by a user through a windshield, and FIG. 1 (B) is an example of a configuration of a HUD device mounted on a vehicle, an example of a virtual image display surface, and an example of a virtual image display surface. It is a figure which shows an example of the arrangement of the virtual image display surface which intentionally causes optical inconsistency.

Vehicle 1 is traveling on a straight road. The user of the HUD device can visually recognize the road side lines 51 and 53, the center line 55, and the traffic light 57 as an actual scene (background) through the windshield (windshield).

In FIG. 1A, the windshield of the vehicle (own vehicle) 1 functions as a projected member (a member having light reflectivity and translucency). The projected member is, in other words, a reflective and translucent member 2. The windshield, which is the projected member (reflecting and translucent member 2), may be a combiner or the like. The HUD device projects the display light onto the reflected light transmitting member 2 provided in the vehicle 1, and generates and displays a virtual image by the display light reflected by the reflected light transmitting member 2.

The HUD device 101 is arranged inside, for example, a dashboard (not shown in FIG. 1, reference numeral 41 in FIG. 6).

Further, in the example of FIG. 1A, an operation unit 9 capable of switching on / off of the HUD device or the like and setting an operation mode or the like is provided in the vicinity of the steering wheel (in a broad sense, the steering handle) 7. ing. A display device (for example, a liquid crystal display device) 13 is provided in the center of the front panel 11. The display device 13 can be used, for example, to assist the display by the HUD device. The display device 13 may be a composite panel having a touch panel or the like.

The virtual image is displayed in the virtual image display area 3 in the windshield (reflection and translucent member) 2. In FIG. 1A, a virtual virtual image display surface (virtual image imaging surface) PS1 (having an uphill inclined surface) is set in front of the vehicle 1, and a virtual image is displayed on the virtual image display surface PS1. To. The virtual image display surface PS1 may be a flat surface or a curved surface inclined with respect to the road surface 40 of the road. Here, the plane or the curved surface may exist on a part of the virtual image display surface PS1. In FIG. 1A, the inclined surface PS1 is a flat surface. The case of a curved surface will be described later.

The end of the virtual image display surface PS1 on the side closer to the vehicle 1 is defined as the near end (indicated by point U1), and the end on the far side is referred to as the far end (indicated by point U4). Further, it is set as the center position of the virtual image display surface PS1 (indicated by the point U3), and the boundary position (indicated by the point U2) that separates the first region Z1 and the second region Z2 between U1 and U3. ). The regions U1 to U2 are designated as the first region Z1, and the regions U2 to U4 are designated as the second region Z2.

On the virtual image display surface PS1, the degree of blurring of the first region Z1 located on the near-end U1 side is compared with the degree of blurring of the second region Z2 located on the far-end U4 side of the first region Z1. The optical system of the HUD device is set so that the degree is larger (this point will be described later).

In the example of FIG. 1A, a virtual image SP of a clear vehicle speed display (display of "50 km / h") is displayed in the first region Z1. In a broad sense, the virtual image of this vehicle speed display SP is a "clear virtual image G1 with no blur or little blur", in other words, an image in which accurate information transmission to the user is important (an image with high sharpness). ) Virtual image G1.

The virtual image G1 of this "highly sharp image" is a non-superimposed content that is always displayed on the front side when viewed from the user (for example, the state of the vehicle 1 or the surrounding situation of the vehicle 1 is not intended to be superimposed on the target). It may be a display (shown), or it may be a navigation display consisting of at least one of characters, figures, symbols, and the like.

On the other hand, a virtual image 65 of a sign (traffic sign) indicating a speed limit is displayed on the back side. The virtual image 65 is properly blurred (in other words, out of focus) to give the user a natural and natural vision. The degree of blurring (blurring amount) is about the same as that of the traffic light 57, which is a real scene, and only the virtual image 65 does not stand out, and the user can visually recognize the virtual image 65 with a natural perspective. Fatigue is also reduced.

The virtual image 65 is, in a broad sense, "a virtual image G2 in which a natural blur corresponding to the distance from the vehicle 1 is generated", in other words, an image (natural) in which it is important to give the user a natural visual sense. It can be said to be a virtual image G2 of an image that gives a sense of perspective (a sense of distance).

The virtual image G2 is an information image including, for example, a figure of an arrow relating to the progress of the vehicle 1 or another vehicle, and a figure other than the arrow (for example, a triangular figure indicating the direction of travel or a circular figure which is a traffic sign). Alternatively, it may be a figure (road surface superposed figure) such as an arrow that is superimposed on the road surface 40 and extends for a considerably long time along the traveling direction of the vehicle 1, for example.

Next, refer to FIG. 1 (B). In FIG. 1B, the direction along the front of the vehicle 1 (also referred to as the front-rear direction) is the Z direction, the direction along the width (horizontal width) of the vehicle 1 is the X direction, and the height of the vehicle 1 is high. The vertical direction (the direction of the line perpendicular to the flat road surface 40 and away from the road surface 40) is the Y direction (upward direction).

Further, in the following description, in the description of the shape of the virtual image display surface and the like, the expressions "upper" and "lower" are used. Here, for convenience of explanation, the direction along the line segment (normal line) perpendicular to the road surface 40 (which is also the height direction of the vehicle 1) is set as the vertical direction. When the road surface is horizontal, the vertical downward direction is downward and the opposite direction is upward. This point can also be applied to the following description of the drawings.

The HUD device 101 includes a light projecting unit (projection unit or projector) 151, a display unit (sometimes referred to as an image display unit, specifically, a screen) 161 having a display surface 164 for displaying an image, and reflection. It has a mirror (folded mirror) 174, a curved mirror (concave mirror) 161, a cover glass 176, an exterior (housing) 121, and a display control unit (sometimes simply referred to as a control unit) 300.

The light projecting unit 151 and the display unit 161 form a projection display. The projection display may be a flat display such as a liquid crystal display. Further, it may be a flat display and a lenticular lens, or a stereoscopic display including a flat display and a barrier.

Further, it is assumed that the display surface 164 of the display unit 161 sets a virtual image display surface perpendicular to (in other words, orthogonal to) the optical axis (specifically, orthogonal to the road surface 40), and in that case, one optical component is used. It is arranged diagonally with respect to the optical axis along the main ray when the main ray passing through the center of the display surface of a certain display unit is assumed. The slope of the slope of the virtual image display surface PS1 (the angle of slope with respect to the road surface 40) is determined by the degree of this slope. An image (video) is displayed (generated) on the display surface 164 of the display unit 161 by projection by the projector 151.

The projector 151 can include, for example, a light source such as an LED, a display panel (such as a liquid crystal panel), and a projection optical system.

Further, as the screen 161 as the display unit, for example, a screen in which a microlens array is formed of a transparent UV curable resin on a transparent polycarbonate base material can be used. The display unit 161 itself may be a display such as a liquid crystal display device.

The reflector (folded mirror) 174 is a mirror in which a metal, for example, aluminum is vapor-deposited on a resin, for example, polycarbonate, which is molded so as to have a flat portion, and reflects the light of a projection display in order to fold an optical path.

The curved mirror (concave mirror) 171 is a mirror in which a metal, for example, aluminum is vapor-deposited on a resin, for example, polycarbonate, which is molded so as to have a concave surface. An image (video) is projected by projecting toward.

The cover glass 176 is a sheet made of a transparent resin, for example, polycarbonate. Further, the exterior 121 is a housing for accommodating all the parts.

The display control unit (control unit) 300 is composed of a microprocessor and various electronic components, boards, cases, etc. for operating the microprocessor, processes vehicle information and user input from the outside, and appropriately displays an image based on the microprocessor information and user input. Control the projection display to do so. An example of the internal configuration of the display control unit 300 will be described later.

Here, the display unit 161 having the display surface 164 is referred to as "one optical member", and the configuration including the concave mirror (curved surface mirror) 171 and the reflecting mirror 174 is referred to as "another optical member". The reflector 174 is provided as needed, and may have a structure without it.

In the present embodiment, the first and first optical members described with reference to FIG. 1A are described by intentionally introducing an optical mismatch between the above-mentioned "one optical member" and the above-mentioned "other optical member". The blurring characteristics (adjustment of the blurring amount) in the regions Z1 and Z2 of 2 are realized. In short, the other optical members (171 and 174) are placed on the display surface of the virtual display unit 163 when the virtual display unit 163 (which is different from the actual display unit 161) is assumed. Its shape and arrangement are designed to give a focused (unfocused) virtual image when the image is displayed. This intentionally creates an optical mismatch. This point will be described in detail with reference to the example of FIG.

Further, in FIG. 1B, the upper end portion of the display unit 161 (display surface 164) is the end portion U1'corresponding to the near end portion U1 of the virtual image display surface PS1, and the lower end portion is the far end portion U4. The end U4'corresponding to.

Further, the display light K includes a light ray E1 corresponding to the near end portion U1 of the virtual image display surface PS1, a light ray E2 corresponding to the intermediate portion U3, and a light ray E3 corresponding to the far end portion U4.

Further, on the left side of FIG. 1B, the virtual image display surface PS2 (corresponding to the virtual display unit 163) is shown by a broken line.

Further, on the left side of FIG. 1B, a range PD of an allowable depth of focus having a predetermined width is shown. If the depth of focus shift is within this range PD, the shift in the image formation is not noticeable to the user's eyes, and the defocus is not substantially perceived. Since the regions U1 to U2 (first region Z1) on the virtual image display surface PS1 are within the range PD, the image formed in the first region Z1 has less noticeable out-of-focus and a clear image. It is an area that can be obtained.

On the other hand, the regions U2 to U4 (second region Z2) are outside the range PD, so that the image formed in the second region Z2 is perceived by the user as being out of focus (blurred). In the example of FIG. 1B, a visual reference point (user's viewpoint A or a predetermined point on the vehicle 1 in place of the user's viewpoint A) is set for each part (each point) of U1, U2, U3, and U4. The distances (virtual image display distances) used as the starting points are L1, L2, L3, and L4. In the range of L2 to L4, as the virtual image display distance increases, the amount (degree) of blurring (out-of-focus) also increases, and natural blurring of the virtual image according to the distance is realized.

Next, refer to FIG. FIG. 2A is a diagram showing a more detailed configuration example of the optical system of the HUD device shown in FIG. 1B, and FIG. 2B is a first and second view on the display surface of the display unit. FIG. 2C is a diagram showing an example in which the real image display area is provided, and is a diagram showing a suitable shape example of the virtual image display surface when the virtual image display surface is a curved surface. In FIG. 2, the same reference numerals are given to the parts common to those in FIG.

The main part of the configuration shown in FIG. 2 (A) is the same as that in FIG. 1 (B), and the description thereof will be omitted. However, in FIG. 2A, the angle of the curved mirror (concave mirror) 171 can be appropriately adjusted by the operation of the rotation mechanism 175 including the actuator, and the inclination and position of the screen 161 include the actuator. It can be adjusted as appropriate by the adjusting unit 173 for the display unit, which is different from FIG. 1 (B).

In FIG. 2A, the display control unit (control unit) 300 comprehensively controls the operation of the light projecting unit (projector) 151, the operation of the rotation mechanism 175, the operation of the adjustment unit 173 for the display unit, and the like. By adjusting the characteristics of the optical system from various viewpoints, for example, the inclination angle of the virtual image display surface, the distance from the road surface 40, etc. can be adjusted, thereby increasing the variation of the shape of the virtual image display surface, etc. Can be done. In FIG. 2A, the display control unit (control unit) 300 is an I / O interface for acquiring information from an external sensor or another ECU, a processor, a memory, and a computer program stored in the memory ( All of them are not shown) and the like.

Next, the intentional setting of the optical mismatch (optical deviation) will be described more specifically.

As described with reference to FIG. 1B, the display unit 161 having the display surface 164 is defined as “one optical member”, and the configuration including the concave mirror (curved mirror) 171 and the reflecting mirror 174 is combined with other optical members. Then, the optical inconsistency between the above-mentioned one optical member and the above-mentioned "other optical member" is intentionally introduced, and the first and second regions Z1 described in FIG. 1 (A), Achieves blurring characteristics (adjustment of blurring amount) in Z2.

In other words, the "other optical member" is, in other words, at least one reflecting member (specifically, specifically, a reflecting member) that reflects light (display light) corresponding to an image formed (generated) on the display surface 164 of the display unit 161. It can be said that only the concave mirror 171 of FIG. 2B, or an optical member other than the display unit 161 including the concave mirror 171 and the reflecting mirror (folded mirror) 174).

Then, an optical mismatch occurs between the display unit 161 as one optical system and the other optical members (171, 174). Specifically, for example, the arrangement of the concave mirror 171 and the reflecting mirror 174 (in other words, the relative positional relationship of the display unit 161 with respect to the display surface 164) and the reflecting surface that reflects light (specifically, the concave mirror 171 and By changing at least one of the shapes (at least one of each reflecting surface of the other reflecting mirror 174) from the normal case (when there is no optical deviation), an optical deviation is intentionally generated. be able to.

As an example, in FIG. 2B, when the other optical members (171 and 174) assume a virtual display unit 163 (which is different from the actual display unit 161), this virtual display unit The shape and arrangement are designed so that when an image is displayed on the display surface (virtual display surface) of 163, a focused (unfocused) virtual image is obtained.

In other words, assuming a virtual display surface (a surface different from the actual reference surface) of the virtual display unit 163, the characteristics of the other optical members (171, 174) (characteristics of a plurality of elements are integrated and generated). (Characteristics as one integrated optical system) so that the image displayed on the virtual display surface can be properly imaged within the allowable depth of focus (in other words, a clear virtual image can be obtained). It means that it will be adjusted to.

For example, by arranging the virtual reference surface and the actual display surface so that one end coincides with the other end and the other ends differ, there is not much difference in the positions of the display areas of the two display surfaces on the one end side. A virtual image that is generally in focus can be displayed at a location in the vicinity thereof, while a difference in the positions of the respective display surfaces becomes large on the other end side, resulting in a difference in the focusing position. In the example of FIG. 2B, the upper ends of the implemented display unit 161 (image display area) and the virtual display unit 163 (image display area) coincide with each other, and the lower ends are considerably separated from each other. Is open.

In the example of FIG. 2B, since each display surface (actual display surface 164 and virtual display surface) is a flat surface, the difference in position increases from one end (upper end) to the other end (lower end). Enlarge and defocus is increased.

Here, reference is made to FIG. 2 (B). In FIG. 2B, first and second real image display areas are set on the display surface 164 of the actual display unit 161 corresponding to the first and second areas on the virtual image display surface PS1. It shows how it looks. The parts of the actual display unit 161 marked with U1'to U4' correspond to the parts U1 to U4 of the virtual image display surface PS1.

On the actual display surface 164, the first real image display area Z1'is set on one end (upper end) side, and the second real image display area Z2'is set on the other end (lower end side). A natural image having an appropriate amount of blur (degree of defocus) according to the distance from one end (upper end) (in other words, according to the virtual image display distance) with respect to the image arranged in the real image display area Z2'. It is possible to display a virtual image of perspective. In particular, since it is possible to "adjust the amount of blurring" that continuously changes with respect to the virtual image display distance without performing any electrical processing, the HUD device with less burden on the image processing software is low. It can be provided at a cost.

However, the method for setting the optical inconsistency is not limited to the above. For example, in order to realize optical mismatch, a correction mirror or a correction lens may be interposed. In this case, the concave mirror and other reflecting mirrors may be arranged and shaped in the same manner as in the normal case, and the correction mirror (correction lens) may cause an optical deviation. Such design changes can be made as appropriate.

Next, refer to FIG. 2 (C). In FIG. 2C, the virtual image display surface PS3 is a curved surface, and in particular, the vicinity of the near end portion U1 is curved downward so as to approach the road surface 40. Therefore, if the first area is set in this curved portion, it is possible to display a standing image (a standing image instead of being inclined with respect to the road surface 40) M1 such as characters and icons, and the user can display the image. It is possible to obtain the effect that the visibility of the above is further improved. On the other hand, in the second region Z2, it is possible to display the tilted image M2 with a sense of depth over a fairly wide range.

The virtual image display surface PS3 having a shape as shown in FIG. 2C is designed, for example, by designing the reflecting surface of the curved surface mirror (concave mirror) 171 as a free curved surface, in other words, an aggregate of a plurality of curved surfaces having different radii of curvature. It will be possible.

The display light K includes a light ray E1 corresponding to the near end portion U1 of the virtual image display surface (indicated by a alternate long and short dash line in FIG. 2 (A)) and a light ray E2 corresponding to the intermediate portion U3 (broken line in FIG. 2 (A)). Included) and the ray E3 corresponding to the far end U4.

In the curved mirror (concave mirror) 171, the portion corresponding to the light rays E2 and E3 (in other words, the part where the light rays E2 and E3 are emitted by the reflection of light) has the same radius of curvature as when the virtual image display surface is a flat surface. Set.

However, for the portion corresponding to the light ray E1, the radius of curvature is set smaller than in the case where the virtual image display surface is a flat surface so that the focal point is shortened. Then, the magnification corresponding to this part becomes large.

The magnification (referred to as c) of the HUD device is the distance (referred to as a) from the display surface 164 of the display unit 161 to the windshield 2 and the light reflected by the windshield (reflecting and translucent member 2) as the viewpoint A. The distance until the image is formed at the imaging point via the above can be expressed by c = b / a, but when the curvature of the portion corresponding to the light ray E1 becomes small, a becomes small. The magnification is increased, and the image is formed at a position farther from the vehicle 1.

Therefore, the near end portion U1 of the virtual image display surface PS3 in FIG. 2C is separated from the vehicle 1, whereby the head is suppressed and the near end portion U1 bows to the road surface 40 side. As a result, a first region Z1 capable of displaying a standing image is formed. Since the optical path lengths of the rays E2 and E3 do not change, the same applies to the plane of FIG. 2 (A), whereby the first region Z1 suitable for displaying a standing image as shown in FIG. 2 (C). And the second region Z2 suitable for displaying the depth image, and the virtual image display surface PS3 having both of them can be obtained.

The explanation will be continued by returning to FIG. 2 (A). The display control unit (control unit) 300 causes the display surface 164 of the display unit 161 to display the "first image" in the first real image display area Z1'corresponding to the first area Z1 of the virtual image display surface. A "second image" different from the first image is displayed in both the second real image display area Z2 corresponding to the second area Z2, or the first and second real image display areas Z1 and Z2.

Here, as described above, the "first image" is an image of the vehicle speed display SP or the like, and in a broad sense, "display by a clear virtual image without blurring or with little blurring is preferable, in other words. , An image that emphasizes accurate information transmission to the user (image with high sharpness) ".

Further, as described above, the "second image" is a figure such as a navigation arrow extending along the traveling direction of the vehicle 1, a sign or a signboard displayed in the distance, and in a broad sense. "It is preferable to display a virtual image with a natural blur that matches the distance from the vehicle 1." In other words, "an image that emphasizes giving the user a natural vision (natural perspective (natural perspective (natural perspective)). An image that gives a sense of distance).

In this way, images having visual characteristics suitable for the respective regions are arranged in the first and second real image display regions Z1'and Z2'. Therefore, from the user's point of view, a clear display is realized on the front side, and a display with a sense of depth over a fairly wide range is realized on the back side, and an inclined one-sided virtual image display surface is used. , The effect that different types of images (virtual images) are displayed with good visibility can be obtained. Further, in the present embodiment, since the distant virtual image is naturally out of focus, even if a part of the virtual image display surface is lifted from the road surface 40, it becomes difficult to see the lift (it becomes difficult to perceive). ) (In other words, the effect of making it difficult to perceive the floating of the virtual image display surface when displaying by the road surface superimposition HUD) can also be expected.

Next, refer to FIG. 3A and 3B are diagrams showing an example of an image (real image) displayed in the first and second real image display areas on the display surface of the display unit. In FIG. 3, the same reference numerals are given to the parts common to the above-mentioned figures.

The images of FIGS. 3A and 3B are drawn upside down for ease of understanding. The lower side of the paper surface is the upper end side of the display surface 164, and the upper side of the paper surface is the lower end side of the display surface 164. When the optical system of the HUD device shown in FIG. 2B is used, the virtual image displayed on the virtual image display surface and the image (real image) displayed on the display surface 164 of the display unit 161 are upside down (real image). Since it is inverted), the virtual image is displayed on the display surface 164 upside down, and it is difficult to understand the image as it is.

In FIGS. 3A and 3B, an image display area 165 is provided on the display surface 164 of the display unit 161 and an image is displayed in the image display area 165.

FIG. 3A shows an image display corresponding to the virtual image display example of FIG. 1A. In the image display area 165 of the display surface 164, the image SP'indicating the vehicle speed of "50 km / h" is displayed in the first real image display area Z1', and the sign is displayed in the second real image display area Z2'. Image 65'is displayed. In the figure, RG1 indicates the first image described above (an image in which sharpness is emphasized), and RG2 indicates a second image (an image in which visibility with natural blur is emphasized). Shown.

FIG. 3B shows another image display example. In the image display area 165 of the display surface 164, the image NV'of the characters for navigation "15 minutes to the destination" is displayed in the first real image display area Z1', and the second real image display area Z2'is displayed. Is displayed with an image 67'of a triangular mark indicating the position of the destination and an image 69' of an arrow for navigation.

Next, refer to FIG. 4 (A) and 4 (B) are views showing an example of a virtual image display surface when displaying a virtual image so as to stick to the road surface, and FIGS. 4 (C) to 4 (E) are visually recognized by the user through a windshield. It is a figure which shows another example of a virtual image. In FIG. 4, the same reference numerals are given to the parts common to the above-mentioned drawings. FIG. 4 shows an example in which the present invention is applied to a technique called a road surface HUD, in which a virtual image is superimposed and displayed on the road surface, as a modified example.

In the example of FIG. 4A, an image (road surface superimposed image) M superimposed on the road surface is displayed on the virtual image display surface PS4 extending horizontally so as to overlap the road surface 40. The virtual image display surface PS4 may be entirely (or partially) located below the road surface 40. Since the person recognizes that the display is made on the road surface, even if the imaging point is below the road surface 40, the image is recognized as if it is stuck to the road surface 40, and no problem occurs. By using this technology, it is possible to suppress the floating of the virtual image display surface from the road surface 40 and realize a road surface superimposition display (in other words, a road surface superimposition display without a sense of discomfort) that is closely attached to the road surface 40. There are advantages.

In FIG. 4B, the virtual image display surface PS5 is set to be slightly inclined near the road surface 40. When it is better to suppress the floating of the far end portion from the road surface, a part of the virtual image display surface PS5 (near the near end portion) may be positioned below the road surface 40.

In the example of FIG. 4C, in the virtual image display area 3 of the windshield 2, the vehicle speed display SP is displayed on the right side of the first area Z1, and the vehicle speed display SP is displayed on the right side of the first area Z1. To the back side of the area Z2, a navigation arrow 71 extending along the traveling direction of the vehicle 1 prompting a left turn is displayed.

The vehicle speed display SP has high sharpness and excellent visibility. Further, the navigation arrow 71 has a base end portion 71a on the side closer to the vehicle 1 and a tip end portion 71b on the far side. The base end 71a is clearly displayed, the tip 71b is blurred according to the distance, and in the region between 71a and 71b, the display is naturally blurred according to the distance, resulting in a natural perspective. A sensational display is realized over a fairly wide range.

In the example of FIG. 4D, the display 73 for vehicle guidance is superimposed on the road surface 40 and displayed. The display 73 for vehicle guidance has a base end portion 73a and a tip end portion 73b, but the amount of blurring increases from 73a to 73b, and therefore, a display having an excellent perspective is realized.

Here, the display control unit 300 described above performs image processing such as reducing the size of the display target and displaying it as the virtual image display distance becomes longer. However, no image processing is required to realize blurring according to the virtual image display distance. Therefore, the burden on the display control unit 300 in controlling the perspective of the display target is sufficiently reduced.

In the example of FIG. 4 (E), a sign 75 is displayed in the upper right corner of the distance, and a circular mark 78 indicating the exit (exit) 77 of the expressway is displayed on the left side in front of the sign 75.

Further, at a certain point in time, a vehicle guidance sign 79 indicating an exit is superimposed on the road surface 40 and displayed in the second region Z2. With the passage of time (in other words, as the vehicle 1 progresses), the sign 79 moves toward the vehicle 1, in other words, toward the first region Z1. Along with the movement, the degree of blurring of the sign 79 gradually decreases and the sharpness increases, so that the user is given a natural vision.

On the other hand, although it is a circular mark 78 indicating the exit (exit) 77 of the expressway, if the user cannot enter at the exit 77 and passes by, the user will have to go to the next exit and come back again. This driving scene is a driving scene with high seriousness (or urgency).

Here, if the circular mark 78 should be clearly displayed even when the exit 77 is far away, the display control unit 300 individually performs image processing on the circular mark 78. , Image processing (display control that suppresses blurring) may be performed to obtain a clear virtual image without blurring.

It causes an optical mismatch to achieve a natural blur, but in some cases the blur is unnecessary. For example, in the case of an important driving scene as described above, in the case of displaying a warning mark to notify that there is an obstacle in the distance (in the case of danger notification), or in the case of notification of the exit of a highway. This is the case of a display with high importance such as. In such a case, the display control unit 300 uses the optical system of the present embodiment by individually performing image processing to suppress blurring and perform correction to increase sharpness to individually relieve the image. It is possible to prevent the adverse effect of the above. Even in this case, since the individual image processing is performed, the load on the image processing software and hardware does not increase so much, so that no problem occurs.

Next, refer to FIG. FIG. 5 is a diagram showing an example of the system configuration of the HUD device. In FIG. 5, the same reference numerals are given as much as possible to the parts common to the above-mentioned figures. The system shown in FIG. 5 includes a display control unit (display control device) 300, an object detection unit 801 and a vehicle information detection unit 803, a display unit 161 and a first actuator 177 and a second actuator 179. And have.

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 or the like).

Further, the first actuator 177 and the second actuator 179 can be used as the rotation mechanism 175 and the adjusting unit 173 shown in FIG. 2 (A). These can also be said to be optical system adjustment systems.

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

Further, one or more processors 742 acquire the position of the road surface 40, for example, so that at least a part of the virtual image display surface is arranged under the road surface 40, for example, based on the position of the road surface 40. It is also possible to drive at least one of the first and second actuators 173 and 175.

Next, refer to FIG. FIG. 6 is a diagram showing an example of the overall configuration of the HUD device. Although the optical system 52 is provided in FIG. 6, the same configuration as that shown in FIG. 1 (B) or FIG. 2 (A) can be adopted as the configuration of the optical system 52. Further, regarding the internal configuration of the optical system 52, the same reference numerals are given to the same parts as those shown in FIG. 1 (B) or FIG. 2 (A).

In the example of FIG. 6, an optical system 52, 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 optical system 52 includes a light projecting unit 151, a display unit (image display unit: specifically, a light transmitting screen or the like) 161 having a display surface 164 on which the image M is formed, and a curved mirror (concave mirror) 171. , Have. The display light K is emitted from the optical system 52 toward the windshield (reflecting light transmitting member 2), and as a result, a virtual image is displayed on the virtual image display surface PS as described above.

The display control unit 300 includes an image output unit 32, a drive unit 33, a virtual image display distance control unit 34, an image generation unit 35, and a first region (for example, a region in which blurring is suppressed) / a second region. (For example, a region with blur), a detection unit 36, a virtual image display surface position adjustment unit 37, and various information acquisition units 39 (including a pitch angle acquisition unit 38 that acquires the pitch angle of the vehicle 1 by calculation or the like). , Have.

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

Further, the communication unit 500 appropriately navigates various information acquired by wireless communication with, for example, a driving support system (or an ADAS system mounted on another vehicle) 600 installed outside the vehicle 10. It may be supplied to the own vehicle position information acquisition unit 408 and the map information acquisition unit 410 of the unit 400. Further, the position information or the like received by the GPS receiving unit 502 from the GPS satellite may be appropriately supplied to the own vehicle position information acquisition unit 408 and the map information acquisition unit 410 of the navigation unit 400.

Further, the vehicle 1 is provided with various sensors (which can include a yaw rate sensor for detecting a pitch angle and the like) 505. Further, various information collected by the in-vehicle ECU 700 is supplied to the navigation unit 400 via the BUS, and a part of the various information (indicated by reference numeral J0) is obtained by the pitch angle acquisition unit 38 and various information acquisition. It is also supplied to section 39. The information J0 can also include danger information in the front and rear of the current driving scene, around the vehicle, and the result of determining the importance of the information to be notified to the user.

The display control unit 300 individually performs a process of reducing (suppressing) the amount of blurring of the display target by referring to the information on the degree of danger and the degree of importance, and relates to an event having a high degree of danger or importance. Regarding the display, accurate information may be provided to the user by suppressing (including eliminating) blurring and providing a clear display regardless of the perspective of the display. Further, when it is determined that the visibility of the user is lower than in the normal state due to bad weather or the like, image processing such as increasing the sharpness of the virtual image display can be appropriately performed.

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

Further, the various information acquisition units 39 take into consideration the pitch angle, the position of the viewpoint A of the user 22, and the like, for example, on the display surface 164 of the display unit 161 shown in FIGS. 1 (B) and 2 (A). The positions of the boundary points U2 and the intermediate points U3 of the first and second regions Z1 and Z2 can be detected and determined.

Further, when the virtual image display surface position adjusting unit 37 determines that the vehicle 1 is approaching an uphill (or downhill), for example, based on the information provided by the driving scene determination unit 19, the virtual image display surface position adjusting unit 37 considers the pitch angle and the like. Then, the position of the slope of the virtual image display surface PS (the position relative to the road surface) is adjusted (corrected).

The detection unit 36 of the first region (region in which blurring is suppressed) / second region (region with blurring) distinguishes between the first region Z1 and the second region Z2 on the virtual image display surface PS. To do. When the virtual image display surface is divided into two or more areas, each area may be determined.

Further, the virtual image display distance control unit 34 is a display position of the information image on the display surface 164 based on the depth information of the information image (navigation information or the like) to be displayed, which is supplied from the navigation unit (navigation ECU) 400. Is determined, thereby adjusting the virtual image display distance. In other words, if the display position is different on the virtual image display surface PS, which is an inclined surface, the virtual image display distance will be different. By positively utilizing this, the virtual image display distance can be appropriately controlled for perspective. It is possible to adjust the feeling and three-dimensional effect. When changing the virtual image display distance by controlling the display position, it is possible to produce an effective perspective by appropriately changing the size of the display target or performing morphological control such as adding shading.

Further, the virtual image display surface PS can be set in front of the vehicle 1, for example, over a range of 100 m. The effect of perspective by controlling the virtual image display distance is meaningless because it becomes difficult for a person to recognize the difference when the display target is more than 20 m (or more than 20 m). In this case, it is preferable to deal with only the form control such as changing the size of the display target.

The image generation unit 35 generates an image (original image) to be displayed on the display surface 164 based on various input information. The generated image (original image) is supplied to the image output unit 32. The image output unit 32 supplies the data cv of the image (original image) to the light projecting unit 150 of the optical system 52. Further, the drive unit 33 supplies, for example, a control signal rvs for rotating the curved mirror (concave mirror) 170 to the actuator (at least one of reference numerals 177 and 179 in FIG. 5).

Next, refer to FIG. FIG. 7 is a flowchart showing 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 (tilt surface) is adjusted (position correction) in consideration of the pitch angle (tilt angle) of the vehicle (step S2). Next, the first region / second region is detected (step S3).

Subsequently, the process of step S4 is executed. In step S4, for example, a virtual image in which less blurring is preferable is displayed in the first region. In addition, a virtual image that is preferably included in the second region, for example, at least one part, is displayed. Further, regarding the depth display, at least one of the change of the virtual image display distance by changing the display position on the display surface and the perspective display by the form control (morphological change) is performed as necessary. Specifically, for example, when the virtual image display distance exceeds 20 m, it becomes difficult to perceive the change in the virtual image display distance due to parallax. Therefore, perspective by morphological control (morphological change) such as size and shape. Display only. On the other hand, when it is 20 m or less, at least one of the change of the virtual image display distance by changing the display position on the inclined surface and the perspective display by the form control (morphological change) is performed. In addition, even if the virtual image is displayed in the second area (in other words, the distant side), if it should be displayed clearly in view of the importance and urgency, the image processing is performed to individually guarantee the sharpness. To do.

As described above, according to the embodiment of the present invention, for example, the projected image of the light projecting unit (projector or the like) forms an image of the tilt angle (tilt angle) of the virtual image display surface (oblique surface) with respect to the road surface. By setting the angle of inclination different from the actual tilt angle of the virtual image display surface, the focus of the display can be optically shifted and the display can be appropriately blurred. For example, by arranging the screen as a display unit in the projection display so that the focus of the region having a large parallax in the distance is shifted from the optimum position, the distant display can be optically blurred. In this case, it is possible to realize a display that naturally reproduces the blur of a distant virtual image. This also contributes to reducing the visual fatigue of the user. However, the method of realizing blur is not limited to the above example.

Further, when displaying a virtual image using a virtual image display surface having an inclined surface, for example, a display that is close to the own vehicle and a display that is far from the own vehicle are displayed at the same time so that the user can compare them. Even in such a case, the sharpness of the display is not uniform, and a natural blurred display according to the distance can be visually recognized, so that a sense of discomfort does not occur and eye strain can be reduced.

Further, even when one display is displayed so as to approach the own vehicle with the passage of time (display movement control), the user can compare the past display with the current display. Therefore, in the above case. However, according to the present embodiment, a natural perspective can be obtained, the same effect as in the above case can be obtained, and no particular problem occurs.

Further, according to the embodiment of the present invention, various displays can be performed by using both a high-definition display and a natural blur display on a virtual image display surface composed of one continuous surface. , It is also possible to improve the expressive power (or performance output) of the HUD device.

As described above, when displaying a virtual image using a virtual image display surface having an inclined surface, it is possible to realize more natural and perspective visibility of the virtual image without increasing the burden on the display control unit. It becomes.

In the present specification, the term vehicle can be broadly interpreted as a vehicle. In addition, terms related to navigation (for example, signs, etc.) shall be interpreted in a broad sense in consideration of, for example, the viewpoint of navigation information in a broad sense useful for vehicle operation. Further, the HUD device shall include one used as a simulator (for example, an aircraft simulator).

The present invention is not limited to the above-mentioned exemplary embodiments, and those skilled in the art will be able to easily modify the above-mentioned exemplary embodiments to the extent included in the claims. ..

1 ... Vehicle (own vehicle), 2 ... Reflective translucent member (windshield, etc.), 3 ... Virtual image display area, 7 ... Steering wheel, 9 ... Operation unit, 11 ... Front panel, 13 ... Display (display panel, etc.), 17 ... Front imaging camera, 19 ... Driving scene judgment unit, 21 ... Image processing unit, 22 ... User, 32 ... Image output unit, 33 ... drive unit, 34 ... virtual image display distance control unit, 35 ... image generation unit, 36 ... first region / second region detection unit, 37 ... Virtual image display surface position adjustment unit, 38 ... pitch angle acquisition unit, 39 ... various information acquisition units, 40 ... road surface, 52 ... optical system, 101 ... HUD device, 151 ... -Light projecting unit, 161 ... Display unit (image display unit: screen, display, etc.), 164 ... Display surface, 171 ... Curved mirror (concave mirror, etc.), 300 ... Display control unit (display) Control device), 400 ... Navigation unit (navigation ECU), 500 ... Communication unit, 502 ... GPS receiver, 505 ... Various sensors, 600 ... Driving support system, 700 ... In-vehicle ECU, 740 ... Display control device (display control unit), Z1 ... First area (for example, area where blurring is suppressed), Z2 ... Second area (for example, area with blurring) ), Z1'... the first real image display area corresponding to the first area Z1, Z2'... the second real image display area corresponding to the second area Z2, PS (PS1 to PS4) ...・ Virtual image display surface (virtual image display surface on an inclined surface)

Claims (6)

A head-up display (HUD) device that projects display light onto a reflected light-transmitting member provided on a vehicle and generates and displays a virtual image by the light reflected by the reflected light-transmitting member.
Other than the display unit, the display unit as one optical member having a display surface for displaying an image and at least one reflection member for reflecting light corresponding to the image formed on the display surface. Optical members, including optical systems,
A display control unit that controls the display of the virtual image,
Have,
The virtual image display surface as the image plane of the virtual image is a flat surface or a curved surface inclined with respect to the road surface of the road.
When the end of the virtual image display surface on the side close to the vehicle is the near end and the end on the far side is the far end, the first region of the virtual image display surface located on the near end side. The display unit as one optical member and the display unit so that the degree of blurring of the second region located on the far end side is larger than the degree of blurring of the first region. There is an optical mismatch with other optical members,
The display control unit
The first image is displayed in the first real image display area corresponding to the first area on the display surface of the display unit, and the second real image display area corresponding to the second area or the first real image display area is displayed. A second image different from the first image is displayed in both the first and second real image display areas.
A head-up display device characterized by this. The other optical system so as to obtain an image within the allowable depth of focus on the virtual display surface of the virtual display unit, which is different from the display surface of the display unit as one optical system. The head-up display device according to claim 1, wherein the optical mismatch is realized by adjusting the characteristics. The head-up display device according to claim 1 or 2, wherein the degree of blurring of the virtual image increases as the virtual image display distance of the virtual image increases on the virtual image display surface. The first image is an image in which it is important to accurately convey the information contained in the first image to the user of the head-up display device.
The head-up display device according to any one of claims 1 to 3, wherein the second image is an image in which it is important to give the user a comfortable visual sense. The virtual image display control unit so that the virtual image approaches the vehicle over time on the second region of the virtual image display surface or on the region where the first and second regions are combined. The head-up display device according to any one of claims 1 to 4, wherein a moving display control is executed. When the virtual image in the second region is a virtual image whose urgency or importance is determined to be higher than usual, the virtual image display control unit displays an image corresponding to the virtual image on the display unit. The head-up display device according to any one of claims 1 to 5, wherein when displaying the image in the second real image display area on the display surface, the image is subjected to image processing for suppressing blurring. ..

Images