JP5533750B2 - In-vehicle display device - Google Patents

Description

  The present invention relates to an in-vehicle display device that includes a display that projects display light for displaying an image, a concave mirror, and a combiner, and displays a virtual image in front of the combiner.

2. Description of the Related Art Conventionally, an in-vehicle display device that is mounted on a vehicle and projects a display light output from a display device to a passenger's viewpoint to visually recognize a virtual image display image is used.
As such an in-vehicle display device, a configuration in which an image showing information shown on a meter of an instrument panel or information on route guidance is projected onto a windshield used as a combiner is conceivable. Since the image projected on the windshield is reflected on the windshield and projected to the driver's eyes, the driver visually recognizes the outside of the vehicle through the windshield and displays the image as a virtual image display image in the field of view. It becomes possible to visually recognize.

  In such an in-vehicle display device, the position of the viewpoint (eye position) may differ vertically depending on the physique of the passenger and the driving posture during driving, and the viewpoint is determined from the center of the display light projected from the display. The virtual image cannot be visually recognized if it deviates greatly. In view of this, a vehicle display device has been proposed in which the display light can reach the position of the viewpoint by adjusting the tilt angle of the reflector provided in the optical path from the display to the windshield. (See Patent Document 1).

Japanese Patent Laid-Open No. 7-144557

  As in the vehicle display device described in Patent Document 1, a concave mirror having an optical function of converging display light output from a display may be used as a reflector. In addition, the combiner is also curved and may have the same optical action as a concave mirror. In an optical element such as a concave mirror, the optical action in the in-plane direction where incident light and reflected light exist increases as the incident angle of light increases. At this time, the optical action of the concave mirror in the in-plane direction orthogonal to the surface where the incident light and the reflected light exist also changes, but the effect is due to the change in the optical action in the in-plane direction where the incident light and the reflected light exist Small enough for it. For this reason, when the position where the display light reaches is adjusted up and down by changing the tilt of the reflector as in the above-mentioned display device for vehicles, the vertical distance of the imaging distance from the viewpoint of the passenger to the virtual image display image is adjusted. Due to the large change in the image distance, there is a problem that the image formation distance is shifted between the vertical direction and the horizontal direction, and the display image quality is deteriorated.

  The objective of this invention is providing the vehicle-mounted display apparatus which can display the virtual image of favorable image quality.

  The invention according to claim 1, which has been made to solve the above-described problem, relates to a vehicle-mounted display device including a display that projects display light for displaying an image, a concave mirror, and a combiner. This in-vehicle display device reflects the display light projected from the display toward the combiner with a concave mirror, and reflects the reflected display light toward the passenger's seat with the combiner, thereby moving the image forward of the combiner. Display a virtual image.

  The concave mirror has a positive power in a plane direction including the optical path of the display light incident on the concave mirror and the optical path of the display light reflected from the concave mirror (hereinafter simply referred to as the plane when referring to the plane). Note that the direction intersecting the plane may have an optical action, or may not have an optical action.

  The concave mirror can be rotated around the rotation axis in the normal direction of the plane, and the arrival position of the display light at the position of the passenger's seat can be changed between the upper position and the lower position. It has become. Note that the rotation axis for rotating the concave mirror need not actually be provided along the normal direction of the plane. For example, even if the concave mirror is configured to be rotationally displaced by an axis provided so as to have an angle with respect to the normal line or a combination of a plurality of axes, the concave mirror is substantially the same in the plane direction. What is necessary is just to be comprised so that it can consider that it rotates centering | focusing on the axis | shaft of a line direction.

  The combiner has positive power in the planar direction. As with the concave mirror, the direction intersecting the plane may have an optical function or may not have an optical function.

  The arrangement of the concave mirror and combiner in the present invention will be described. The optical path from the center position of the display to the intermediate position, which is an intermediate position between the upper position and the lower position, is the principal ray, and the normal of the concave mirror at the point where the principal ray enters the concave mirror is the concave mirror central axis. The normal line of the combiner at the point where the chief ray enters the combiner is taken as the combiner central axis.

  At that time, the arrangement of the concave mirror and the combiner is such that the direction of inclination of the concave mirror central axis with respect to the principal ray incident on the concave mirror and the direction of inclination of the combiner central axis with respect to the principal ray incident on the combiner are the same in the plane direction. It is a relationship.

In the present invention, a lens is further disposed on the optical path between the concave mirror and the combiner. This lens has (A) the central axis of the lens from the display to the concave mirror in the same plane as the principal ray when the lens normal is the lens normal at the point where the principal ray is incident on the lens. And (B) a lens that is inclined in the same direction with respect to both the light beam that is reflected by the concave mirror and reaches the upper position and the light beam that reaches the lower position. In the direction in which the difference between the positive power received by the concave mirror and the combiner from the concave mirror and the combiner and the positive power received by the display mirror directed to the lower position from the concave mirror and the combiner is reduced. It is inclined to.

  In the vehicle-mounted display device configured as described above, even when the concave mirror is rotated and the arrival position of the display light is changed to the upper position or the lower position, deterioration of the image quality is suppressed by the lens. The reason for this will be described below.

  When the concave mirror is rotated, the incident angle of the display light projected from the display on the concave mirror changes. The positive power that the display light receives from the concave mirror increases as the incident angle increases. Further, by rotating the concave mirror, the traveling direction of the display light reflected from the concave mirror also changes, so that the incident angle of the display light also changes in the combiner, and the positive power received by the display light from the combiner also changes.

  That is, the positive power received by the display light in the plane direction changes according to the rotational position of the concave mirror. Whether the upper position or the lower position receives a stronger positive power depends on the curvature of the concave mirror and the combiner and the incident angle of the principal ray on the concave mirror and the combiner.

  In this state, the virtual image visually recognized from the position of the passenger's seat receives positive power that varies depending on the rotational position of the concave mirror as described above. As a result, for example, the projection optical system is configured so that when the display light is projected to an intermediate position that is the center between the upper position and the lower position, the image quality is good (so that a virtual image with good image quality is visually recognized). However, when the concave mirror is rotated and the display light reaches the upper position or the lower position, the image quality of the virtual image visually recognized from the position is deteriorated because the positive power changes in the plane direction.

  Here, when the lens is arranged as shown in (A) above, the display light is stronger as the arrival position is closer to one of the upper position and the lower position, and weaker as it is closer to the other, and positive or negative power is applied. . The sign of the applied power is determined by the shape of the lens. And if it arrange | positions as said (B), the difference of the positive power added to the display light by the concave mirror and the combiner will reduce.

Therefore, it is possible to suppress deterioration in image quality caused by the rotation of the concave mirror and display a virtual image with good image quality.
An example of specific lens arrangement will be given. When the concave mirror and the combiner are configured so that the display light directed to the upper position receives a stronger positive power than the display light directed to the lower position, and a lens having negative power in the plane direction is used as the lens The lens central axis is inclined with respect to the principal ray incident on the lens in the same direction as the direction in which the central axis of the combiner is inclined with respect to the principal ray incident on the combiner with respect to the planar direction. The inclination direction of the lens central axis is the direction in which the positive power difference in (B) described above is reduced. In addition, the direction of inclination here refers to the rotation direction when the central axis is rotated from the principal ray with the normal line in the plane direction as the rotation axis.

  In addition, a configuration in which the display light directed to the upper position receives positive power more strongly than the display light directed to the lower position by the concave mirror and the combiner is considered to satisfy the following (Equation 1).

  In the above equation, with respect to the plane direction, the radius of curvature of the concave mirror at the point where the chief ray is incident on the concave mirror is Rm, the incident angle is θm, and the radius of curvature of the combiner at the point where the chief ray is incident on the combiner is Rc, The incident angle is θc.

  As another example of the lens arrangement, the following can be considered. The concave mirror and the combiner are configured such that the display light traveling downward is received with a stronger positive power than the display light traveling upward, and has a positive power in the planar direction as a lens. Is used, the lens central axis is inclined with respect to the principal ray incident on the lens in the same direction as the direction in which the central axis of the combiner is inclined with respect to the principal ray incident on the combiner with respect to the planar direction. . The inclination direction of the lens central axis is the direction in which the positive power difference in (B) described above is reduced. In addition, the direction of inclination here refers to the rotation direction when the central axis is rotated from the principal ray with the normal line in the plane direction as the rotation axis.

  In addition, the configuration in which the concave mirror and the combiner receive the positive power stronger than the display light directed to the upper position than the display light directed to the upper position may satisfy the following (Equation 2).

The side view which shows the vehicle-mounted display apparatus of Example 1. Enlarged view around the concave mirror Enlarged view around the windshield The side view which shows the vehicle-mounted display apparatus of Example 2.

Embodiments of the present invention will be described below with reference to the drawings.
[Example 1]
(1) Configuration The vehicle-mounted display device 1 according to the present embodiment is used by being mounted on a vehicle (moving body), and as shown in FIG. 1, a display 11, a concave mirror 13, and a cylindrical-shaped plano-concave lens 15. , Windshield 17, operation switch 19, and control device 21. Among these, the display 11, the concave mirror 13, the plano-concave lens 15, and the control device 21 are housed in a space 23 inside the instrument panel.

  The function of each component of the in-vehicle display device 1 will be described. An optical path 31 in FIG. 1 indicates a principal ray projected from the display 11 and incident on the concave mirror 13, and optical paths 31 a to 31 c are viewpoints to be described later among the rays that pass through the optical path 31 and are reflected by the concave mirror 13. The optical path 31b toward the intermediate position of the viewpoint indicates the chief ray. Hereinafter, a plane including the optical path 31 of the display light incident on the concave mirror 13 and the optical paths 31a to 31c of the display light reflected from the concave mirror 13 (a plane along the paper surface direction in FIG. 1) will be described as a reference plane. . Also, the direction of rotation on the reference plane, which will be defined later, is the direction when viewing the reference plane from the left side of the vehicle (the direction when viewing FIG. 1 from above the page).

  The image (display light) projected from the display 11 is reflected and magnified by the concave mirror 13, passes through the plano-concave lens 15, and is projected on the windshield 17 provided in the vehicle. The display light reflects this windshield 17 as a combiner and reaches the viewpoint of the driver at the position of the driver's seat. The arrival position of the display light changes between the upper position 25a and the lower position 25c by the rotation of the concave mirror 13 described later. An intermediate position between the upper position 25a and the lower position 25c is defined as an intermediate position 25b.

  For example, when the viewpoint is at the upper position 25a, the driver rotates the concave mirror 13 and adjusts so that the optical path of the display light becomes the optical path 31a, thereby outputting from the display 11 at a point in front of the windshield 17. The displayed image can be visually recognized as an enlarged virtual image 27a. In FIG. 1, the virtual image 27b is a virtual image viewed from the intermediate position 25b, and the virtual image 27c is a virtual image viewed from the lower position 25c.

  The concave mirror 13 is a mirror having a mirror surface on the inside of a curved surface and having a function of converging display light (having positive power), and has a known configuration. In this embodiment, the concave mirror 13 is provided with a rotation driving device 35, and the rotation driving device 35 enables the concave mirror 13 to rotate around the rotation axis 33 in the normal direction of the plane. When the concave mirror 13 rotates, the angle formed by the central axis 41 of the concave mirror 13 and the optical path 31 (the incident angle of display light to the concave mirror) changes. The central axis 41 of the concave mirror 13 is the normal line of the concave mirror 13 at the point where the optical path 31 (chief ray) is incident on the concave mirror 13 at the rotational position of the concave mirror where the display light is reflected by the optical path 31b (principal ray). It is. The central axis 41 is an axis determined with reference to the concave mirror 13 and is displaced as the concave mirror 13 rotates.

  In accordance with the change in the incident angle, the optical path of the display light from the concave mirror 13 to the windshield 17 and the optical path from the windshield 17 to the driver's seat change. Therefore, by rotating the concave mirror 13, the arrival position of the display light can be freely changed between the upper position 25a and the lower position 25c so as to match the position of the driver's viewpoint.

Further, the windshield 17 is formed so as to have a curvature with respect to the reference plane, and, like the concave mirror 13, gives positive power to the display light.
The operation switch 19 is used when the inclination angle of the concave mirror 13 is changed, and is disposed on the instrument panel so that the driver can operate it by hand.

  The control device 21 controls the entire operation of the in-vehicle display device 1 and is connected to various electronic control units and sensors (not shown) mounted on the vehicle, and various information (based on the output signals ( For example, display light indicating vehicle travel speed information) is projected on the display 11. Further, the control device 21 adjusts the inclination angle of the concave mirror 13 by operating the rotation driving device 35 provided on the concave mirror 13 and rotating the concave mirror 13 based on the operation of the operation switch 19 by the driver.

Next, the arrangement of each component of the in-vehicle display device 1 will be described.
The display 11 and the concave mirror 13 are arranged such that the central axis 41 of the concave mirror 13 is inclined counterclockwise with respect to the optical path 31 between the display 11 and the concave mirror 13 with respect to the reference plane.

  Further, the display 11 and the concave mirror 13 have the central axis 43 of the windshield 17 counterclockwise with respect to the windshield 17 with respect to any of the optical paths 31a to 31c of the display light incident on the windshield 17 with respect to the reference plane. It is arranged so as to be inclined in the direction. Here, the central axis 43 is a normal line of the windshield 17 at the incident position of the principal ray on the windshield 17.

  Further, the plano-concave lens 15 is arranged so that the plane side faces the concave mirror 13 side and the concave side faces the windshield 17 side. The central axis 45 of the plano-concave lens 15 is arranged so as to be inclined counterclockwise with respect to any of the optical paths 31a to 31c between the concave mirror 13 and the windshield 17 with respect to the reference plane. The central axis 45 is a normal line of the plano-concave lens 15 at the point where the principal ray enters the plano-concave lens 15.

Next, the incident angle of the display light to the concave mirror 13 and the windshield 17 will be described.
A change in the incident angle of the display light to the concave mirror 13 accompanying the rotation of the concave mirror 13 will be described with reference to FIG.

As described above, the concave mirror 13 can rotate around the rotation shaft 33, and can freely change between the upper position 25a and the lower position 25c by the rotation.
The incident angle when the reflected light from the concave mirror 13 of the display light becomes the optical path 31a (the angle between the central axis 41 of the concave mirror 13 and the optical path 31) is θm1, and the incident angle when the reflected light is the optical path 31b is θm2 and the optical path 31c. When the incident angle at is θm3, the relationship is θm1 <θm2 <θm3.

A change in the incident angle of the display light to the windshield 17 accompanying the rotation of the concave mirror 13 will be described with reference to FIG.
The incident angle when the display light becomes the optical path 31a (the angle between the normal of the windshield 17 and the optical path 31a at the incident position of the optical path 31a with respect to the windshield 17) is θc1, and the incident angle when the display light becomes the optical path 31b ( The angle between the center axis 43 of the windshield 17 and the optical path 31b representing the normal of the windshield 17 at the incident position of the optical path 31b with respect to the windshield 17 is θc2, and the incident angle when the display light is the optical path 31c (the windshield 17). If the angle between the normal of the windshield 17 and the optical path 31c at the incident position of the optical path 31c with respect to is θc3, the relationship is θc1>θc2> θc3. In addition, it is comprised so that an incident angle may become small gradually from the optical path 31a to the optical path 31c.

In the present embodiment, the display light traveling toward the upper position 25a is configured to receive a stronger positive power than the display light traveling toward the lower position 25c.
(2) Action and effect of plano-concave lens When a light ray is obliquely incident on a curved surface, the apparent radius of curvature of the curved surface is smaller than when the light is vertically incident. This is because, when considering the case where parallel light having a certain minimum beam width d is incident, an optical action is received in the region of the width d at normal incidence, whereas the width d at oblique incidence at an incident angle θ. As can be seen from the optical action in the region of / cosθ.

Therefore, the power received by the incident light from the curved surface (the radius of curvature R) when obliquely incident is 1 / cos θ times as compared with the case where it is incident perpendicularly.
Differentiating this equation (1 / cosθ) with respect to the incident angle θ yields (sinθ / cos ² θ). This value represents the sensitivity of the change in the power of the curved surface when the incident angle changes. The larger the value, the greater the power with respect to the change in the incident angle.

  Accordingly, in the present embodiment, the incident angle to the concave mirror 13 is θm1 <θm2 <θm3. Therefore, when the display light passes through the optical path 31c toward the lower position 25c, the positive power is the strongest. The positive power received gradually decreases as the optical path moves toward the upper position 25a.

  On the other hand, since the incident angle to the windshield 17 is θc1> θc2> θc3, the display light receives the strongest positive power when the display light passes through the optical path 31a toward the upper position 25a, and the lower position. The positive power received as the optical path moves to the 25c side gradually decreases.

That is, in the arrangement of the present embodiment, the concave mirror 13 and the windshield 17 strongly apply positive power separately to the upper position 25a and the lower position 25c.
However, as described above, in this embodiment, the display light traveling toward the upper position 25a is configured to receive positive power stronger than the display light traveling toward the lower position 25c. More specifically, it is configured to satisfy the following (Equation 3).

  In the above formula, with respect to the plane direction, the radius of curvature of the concave mirror 13 at the point where the principal ray of the display light is incident on the concave mirror 13 is Rm, the incident angle is θm, and the principal ray is incident on the windshield 17. The radius of curvature of the windshield 17 at the point to be applied is Rc, and the incident angle is θc. The power of the concave mirror 13 is (2 / Rm), and the power of the windshield 17 is (2 / Rc).

  In the above case, when the plano-concave lens 15 is arranged as described above, the incident angle of the optical path 31a is the largest and the incident angle of the optical path 31c is the smallest, as shown in FIG. Since the plano-concave lens 15 has negative power, the negative power given to the display light on the optical path 31a (display light toward the upper position 25a) is the strongest, and is given to the display light on the optical path 31c (display light toward the lower position 25c). Negative power is the weakest.

  Therefore, by using the plano-concave lens 15, even if the arrival position of the display light changes between the upper position 25a and the lower position 25c, the difference in positive power received at that time is reduced, and a virtual image with good image quality. Can be visually recognized.

  Further, since the plano-concave lens 15 is arranged so that the concave surface side faces the windshield 17 side, it is more susceptible to changes in the incident angle than when the concave surface side faces the concave mirror 13, and to provide the same level of optical action. The required lens thickness can be reduced, and the space 23 required for installation in the instrument panel can be reduced.

[Example 2]
Since the vehicle-mounted display device of the second embodiment has the same configuration as that of the first embodiment except for the plano-concave lens 15, the concave mirror 13, and the windshield 17 in the first embodiment, only the differences will be described and the description will be the same. Will be omitted.

  In the present embodiment, as shown in FIG. 4, a cylindrical plano-convex lens 51 is used instead of the plano-concave lens. The plano-convex lens 51 is arranged so that the plane side faces the windshield 17 and the concave side faces the concave mirror 13. The central axis 53 of the plano-convex lens 51 is arranged so as to be inclined counterclockwise with respect to any of the optical paths 31a to 31c between the concave mirror 13 and the windshield 17 with respect to the reference plane.

  Contrary to the first embodiment, the concave mirror 13 and the windshield 17 of the present embodiment are configured such that the display light toward the lower position 25c receives stronger positive power than the display light toward the upper position 25a. . More specifically, it is configured to satisfy the following (Equation 4). Each variable in (Equation 4) is the same as that in (Equation 3) above.

  In the in-vehicle display device 1 configured as described above, when the plano-convex lens 51 is arranged as shown in FIG. 4, the incident angle of the optical path 31a is the largest and the incident angle of the optical path 31c is the smallest. Since the plano-convex lens 51 has positive power, the positive power given to the display light on the optical path 31a (display light toward the upper position 25a) is the strongest, and is given to the display light on the optical path 31c (display light toward the lower position 25c). Positive power is the weakest.

  Therefore, by using the plano-convex lens 51, even if the arrival position of the display light changes between the upper position 25a and the lower position 25c, the difference in positive power received at that time is reduced, and a virtual image with good image quality. Can be visually recognized.

[Modification]
As mentioned above, although the Example of this invention was described, it cannot be overemphasized that this invention can take a various form, as long as it belongs to the technical scope of this invention, without being limited to the said Example at all.

  For example, in the first embodiment, the configuration using the cylindrical-shaped plano-concave lens 15 is illustrated, but various lenses having negative power in the direction of the reference plane can be used instead of the plano-concave lens 15. In the second embodiment, the configuration using the cylindrical plano-convex lens 51 is illustrated. However, various lenses having positive power in the direction of the reference plane can be used instead of the plano-convex lens 51.

  Further, in the first embodiment, a lens having a positive power in the direction of the reference plane is used instead of the plano-concave lens 15, and the optical axis 31a between the concave mirror 13 and the windshield 17 with respect to the reference plane is set with respect to the central axis of the lens. ˜31c may be arranged so as to incline in the clockwise direction (that is, to have an inclination opposite to that of the first embodiment). By changing both the positive and negative of the lens power and the tilt direction, the same actions and effects as in the first embodiment can be obtained. Similarly, in the second embodiment, a lens having negative power in the direction of the reference plane may be used so as to have an inclination opposite to that in the second embodiment.

  Moreover, in the said Example, although the rotation drive apparatus 35 was operated using the operation switch 19 and the structure which adjusts the inclination angle of the concave mirror 13 was illustrated, the structure of the operation switch 19 is not limited to the structure of an Example. Various configurations can be taken. Alternatively, the height of the passenger's eyes may be automatically detected, and the inclination angle of the concave mirror 13 may be automatically adjusted according to the detected height. As a method of automatically detecting the height of the passenger's eyes, for example, it is conceivable to detect a portion showing the eyes from a photographed image near the passenger's face.

  Moreover, in the said Example, although the structure which uses the windshield 17 as a combiner was illustrated, you may provide a combiner separately besides the windshield 17, and it may be the structure which uses the rear glass and side glass of a vehicle as a combiner. Good.

DESCRIPTION OF SYMBOLS 1 ... Car-mounted display apparatus, 11 ... Display, 13 ... Concave mirror, 15 ... Plano-concave lens, 17 ... Windshield, 19 ... Operation switch, 21 ... Control apparatus, 23 ... Space, 25a ... Upper position, 25b ... Intermediate position, 25c ... lower position, 27a, 27b, 27c ... virtual image, 31 ... optical path, 33 ... rotating shaft, 35 ... rotary drive, 41, 43, 45 ... central axis, 51 ... plano-convex lens, 53 ... central axis

Claims (5)

A display device for projecting display light for displaying an image, a concave mirror, and a combiner. The display light projected from the display device is reflected by the concave mirror toward the combiner, and the reflected display light is reflected. The vehicle-mounted display device displays a virtual image in front of the combiner by reflecting the image toward the passenger's seat at the combiner,
The concave mirror has a positive power in a plane direction including an optical path of the display light incident on the concave mirror and an optical path of the display light reflected from the concave mirror, and is rotated in a normal direction of the plane. It is configured to be rotatable about an axis, whereby the arrival position of the display light at the position of the occupant's seat can be changed between an upper position and a lower position,
The combiner has a positive power in the planar direction,
An optical path from the center position of the display to an intermediate position that is an intermediate position between the upper position and the lower position is a principal ray.
When the normal line of the concave mirror at the point where the chief ray is incident on the concave mirror is the concave mirror central axis, and when the normal line of the combiner at the point where the chief ray is incident on the combiner is the combiner central axis ,
The concave mirror and the combiner are arranged so that the concave mirror central axis is inclined with respect to the principal ray incident on the concave mirror and the combiner central axis is inclined with respect to the principal ray incident on the combiner with respect to the planar direction. Are in the same direction,
Furthermore, the vehicle-mounted display apparatus provided with the lens arrange | positioned so that the conditions of the following (A) and (B) may be satisfy | filled on the optical path between the said concave mirror and the said combiner.
(A) When the normal of the lens at the point where the chief ray is incident on the lens is a lens central axis, the lens central axis is the main axis from the display to the concave mirror with respect to the planar direction. Inclined in the same direction with respect to both the light beam that passes through the same optical path as the light beam, is reflected by the concave mirror, and reaches the upper position and the light beam that reaches the lower position (B) The lens central axis is a positive power that the display light toward the upper position receives from the concave mirror and the combiner with respect to the planar direction, and a positive power that the display light toward the lower position receives from the concave mirror and the combiner. Inclined in the direction of reducing the difference between power and The concave mirror and the combiner are configured such that the display light going to the upper position receives positive power stronger than the display light going to the lower position,
The lens is a lens having negative power in the planar direction;
The lens central axis is inclined with respect to the principal ray incident on the lens in the same direction as the direction in which the combiner central axis is inclined with respect to the principal ray incident on the combiner with respect to the planar direction. The in-vehicle display device according to claim 1. Regarding the plane direction, the radius of curvature of the concave mirror at the point where the chief ray is incident on the concave mirror is Rm, the incident angle is θm, and the radius of curvature of the combiner at the point where the chief ray is incident on the combiner is Rc. When the incident angle is θc,
The in-vehicle display device according to claim 2, wherein the concave mirror and the combiner are configured to satisfy the following expression.

The concave mirror and the combiner are configured such that the display light toward the lower position receives a positive power stronger than the display light toward the upper position,
The lens is a lens having a positive power in the planar direction;
The lens central axis is inclined with respect to the principal ray incident on the lens in the same direction as the direction in which the combiner central axis is inclined with respect to the principal ray incident on the combiner with respect to the planar direction. The in-vehicle display device according to claim 1. Regarding the plane direction, the radius of curvature of the concave mirror at the point where the chief ray is incident on the concave mirror is Rm, the incident angle is θm, and the radius of curvature of the combiner at the point where the chief ray is incident on the combiner is Rc. When the incident angle is θc,
The in-vehicle display device according to claim 4, wherein the concave mirror and the combiner are configured to satisfy the following expression.

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