JP2018087900A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device capable of displaying an image of certain quality using a same projection optical system while suppressing change in a size of a correction optical system even when a distance between a display area and the projection optical system changes.SOLUTION: An image display device includes: an intermediate image display body in which an intermediate image is formed; a projection optical system for projecting an image corresponding to the intermediate image on a display area; and a correction optical system that is disposed at a prescribed position between the intermediate image display body and the projection optical system to correct an outgoing beam from the intermediate image display body. An virtual image visible by an object person is formed based on the image projected on the display area, and the correction optical system is selected in accordance with conditions on the display area.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image display device that projects an image corresponding to an intermediate image onto a display area by a projection optical system, thereby forming a virtual image based on the projected image.

  The on-vehicle head-up display described in Patent Document 1 has a projection optical system for projecting an image displayed on a display information source toward a windshield of a vehicle, and reflects light reflected from the windshield of an observer. A correction optical member for correcting distortion and inclination of an image generated by reflecting the windshield in the optical path between the windshield and the display information source can be selectively arranged in the optical path between the windshield and the display information source. Composed. Accordingly, a highly versatile in-vehicle head-up display capable of observing a good image without being affected by the difference in the shape of the windshield is provided.

JP 2005-202145 A

  In the in-vehicle head-up display described in Patent Document 1, the correction optical member constitutes a part of the projection optical system. In the configuration shown in the embodiment, a plurality of optical members constituting the projection optical member are included. It is arranged at a position to be sandwiched. When the correction optical member is arranged at such a position, the dimension of the correction optical member must be increased in accordance with the distance from the image display area, the angle of the windshield, and the like. There is a problem that a part of the vehicle is exposed from the dashboard, and the reflected light from the exposed portion reaches the driver.

  Therefore, the present invention provides an image display device that can display an image of a certain quality using the same projection optical system while suppressing a change in the size of the correction optical system even if the distance between the display region and the projection optical system changes. The purpose is to provide.

In order to solve the above problems, an image display device of the present invention includes an intermediate image display body on which an intermediate image is formed, a projection optical system that projects an image corresponding to the intermediate image onto a display area, and an intermediate image display body. A correction optical system that is arranged at a predetermined position between the projection optical system and corrects the light emitted from the intermediate image display body, and forms a virtual image that can be visually recognized by the subject based on the image projected on the display area. The correction optical system is selected according to a condition related to the display area.
As a result, the same projection optical system is used even if conditions such as the distance between the display area and the projection optical system and the installation angle of the display area vary depending on the environment in which the image display apparatus is installed, for example, the type of vehicle to be installed. In addition, it is possible to display an image with a certain quality while suppressing an increase in the size of the correction optical system.

In the image display device of the present invention, it is preferable that the conditions relating to the display area include at least one of a distance between the display area and the projection optical system and an installation angle of the display area.
As a result, even if the distance between the display area and the projection optical system or the installation angle of the display area changes due to the difference in the environment in which the image display apparatus is installed, the same projection optical system can be used and the correction optical system is large. Therefore, it is possible to display an image with a certain quality while suppressing the conversion to the image.

In the image display device of the present invention, the correction optical system is preferably arranged in the vicinity of the intermediate image display body.
As a result, even if the viewpoint or line of sight of the person who sees the projected image changes and the viewpoint or line of sight changes, the distortion of the projected image can be suppressed to the same extent as when facing the front front.

In the image display device of the present invention, the image display device is mounted in a vehicle, the target person is a driver of the vehicle, and the display area is set to a windshield of the vehicle or a combiner disposed inside the windshield. The virtual image is preferably formed in front of the windshield, and the conditions relating to the display area are preferably determined according to the type of vehicle.
As a result, even if conditions such as the distance between the display area and the projection optical system and the installation angle of the display area change depending on the type of vehicle on which the image display device is installed, the same projection optical system can be used and correction optics can be used. An image of a certain quality can be displayed while suppressing an increase in size of the system.

In the image display device of the present invention, the correction optical system is held by the holder, and the correction optical system according to the condition relating to the display area is mounted at a predetermined position between the intermediate image display body and the projection optical system by attaching the holder. It is preferable to arrange | position.
Thereby, the correction optical system corresponding to the installation environment of the image display apparatus can be selected easily and quickly.

In the image display device of the present invention, it is preferable that the projection optical system has at least two projection mirrors for enlarging and reflecting incident light.
Thereby, in the projection optical system, the image light can be enlarged while the optical path is bent, so that the size can be reduced.

  According to the present invention, an image display device capable of displaying a constant quality image using the same projection optical system while suppressing a change in the size of the correction optical system even when the distance between the display region and the projection optical system changes. Can be provided.

It is a side view showing a schematic structure of a head up display device concerning an embodiment of the present invention. (A) is a perspective view showing the configuration of the correction lens shown in FIG. 1, and (B) is a side view showing the arrangement of the diffuser and the correction lens when the holder is at the opposing position. (A) is a perspective view which shows the structure of the correction lens in Example 2, (B) is a side view which shows the structure of the correction lens shown to (A). (A) is a perspective view which shows the structure of the correction lens in Example 3, (B) is a side view which shows the structure of the correction lens shown in (A). It is a side view which shows schematic structure of the head-up display apparatus which concerns on the comparative example 1. (A) is a perspective view which shows the structure of the correction lens in the comparative example 1, (B) is a side view which shows the structure of the correction lens shown to (A). In Example 1, it is a figure which shows the distortion of an image when the intermediate image made into the rectangle on a diffuser is projected on the position of a driver | operator's face. In Example 2, it is a figure which shows the distortion of an image when the intermediate image made into the rectangle on a diffuser is projected on the position of a driver | operator's face. In Example 3, it is a figure which shows the distortion of an image when the intermediate image made into the rectangle on a diffuser is projected on the position of a driver | operator's face. In comparative example 1, it is a figure which shows distortion of an image when the intermediate image made into the rectangle on a diffuser is projected on the position of a driver | operator's face. In comparative example 2, it is a figure which shows distortion of an image when the intermediate image made into the rectangle on a diffuser is projected on the position of a driver | operator's face. In comparative example 3, it is a figure showing distortion of an image when an intermediate picture made into a rectangle on a diffuser is projected on a position of a driver's face. In comparative example 4, it is a figure which shows distortion of an image when the intermediate image made into the rectangle on a diffuser is projected on the position of a driver | operator's face.

  A head-up display device as an embodiment of an image display device of the present invention will be described in detail below with reference to the drawings. In the present embodiment, an in-vehicle head-up display device is taken as an example, but the image display device of the present invention is not limited to this, and can also be applied to a device that projects an image on a screen or the like.

FIG. 1 is a side view showing a schematic configuration of a head-up display device 10 according to the present embodiment. 2A is a perspective view showing the configuration of the correction lens 13 shown in FIG. 1, and FIG. 2B is a side view showing the arrangement of the diffuser 12 and the correction lens 13 when the holder 14 is at the opposing position P1. .
A head-up display device 10 shown in FIG. 1 includes an optical engine 11, a diffuser 12 as an intermediate image display, a correction lens 13 as a correction optical system, a holder 14 that holds the correction lens 13, and a projection optical system 20. With.

  The optical engine 11 is a unit that forms an intermediate image on the diffuser 12. The optical engine 11 includes a visible light laser or LED as a light source, a scanning mirror that reflects light emitted from the light source, and the reflected light from the scanning mirror is incident on the diffuser 12 as light parallel to the optical axis 12c of the diffuser 12. A collimator lens to be driven, a driving circuit for driving the light source and the scanning mirror, and a storage circuit. For example, the optical engine is configured by DLP (Digital Light Processing). In the case of DLP, the scanning mirror is a DMD (Digital Mirror Device).

The diffuser 12 as the intermediate image display body is, for example, a microlens array, a diffusion plate, a random phase plate, or a diffraction grating.
The optical engine 11 is driven according to control data stored in advance in a storage circuit corresponding to an intermediate image formed on the diffuser 12.

  The scanning mirror of the optical engine 11 as a two-dimensional scanner has a reflecting surface that rotates about two rotation axes that are orthogonal to each other. In this scanning mirror, one line of light is incident on the collimator lens by rotation about the first rotation axis, and after a predetermined amount of rotation about the second rotation axis, By rotating around one rotation axis, the next one line of light enters the collimator lens, and by repeating these, one frame of light is irradiated onto the collimator lens. The light irradiated on the collimator lens is emitted to the diffuser 12, and an intermediate image is formed on the diffuser 12.

  Further, the DMD or LCOS (trademark, Liquid crystal on silicon) can be used instead of the scanning mirror. When DMD is used, incident light from a light source is reflected by each of a plurality of micromirrors arranged in a matrix, and an intermediate image is formed on the diffuser 12. The LCOS can be either a transmission type or a reflection type, and an intermediate image is formed on the diffuser 12 by transmitted light or reflected light from the LCOS.

  Furthermore, instead of the optical engine 11 and the diffuser 12, a self-luminous device such as an LCD (liquid crystal display) or an EL element (electroluminescence element) can be used.

As shown in FIG. 1 or FIG. 2 (B), there is a holder on the optical path extending from the exit surface 12a of the diffuser 12 to the projection optical system 20 along the direction T on the extension line of the optical axis 12c of the diffuser 12. A correction lens 13 held at 14 is disposed. That is, the correction lens 13 is disposed between the diffuser 12 and the projection optical system 20. The correction lens 13 is a plano-convex positive lens having a convex surface facing the projection optical system 20, and is arranged so that its optical axis 13 c overlaps with an extension line of the optical axis 12 c of the diffuser 12. More specifically, as shown in FIG. 2, the incident surface 13a on which the light emitted from the diffuser 12 is incident is a plane orthogonal to the incident direction T, and the output surface 13b is a convex surface protruding toward the projection mirror 21. The shape of the convex surface is a single spherical surface, an aspherical surface, a free-form surface, or a combination of these in accordance with the correction function and condensing function of the correction lens 13. The correction lens 13 condenses the light emitted from the diffuser 12 and emits the light toward the projection mirror 21 located on the extended line of the optical axis 13c. Since the correction lens 13 has a condensing function, the optical path of the image light from the diffuser 12 toward the projection optical system 20 can be narrowed down, and loss of the image light can be suppressed.
Here, a direction T shown in FIG. 1 is a direction along the optical axis 12c of the diffuser 12 and the optical axis 13c of the correction lens 13, and is a direction from the correction lens 13 toward the projection mirror 21.

  The holder 14 holds the correction lens 13 so as not to prevent the light that has entered the correction lens 13 from the diffuser 12 from being emitted to the projection optical system 20 side, and is attached to the optical axis 12c of the diffuser 12 by a drive mechanism (not shown). It is movable along the vertical direction D (the direction of the arrow shown in FIG. 1). In the moving direction D, the holder 14 is either one of a facing position P1 where the diffuser 12 and the correction lens 13 face each other, and a retracting position P2 where the diffuser 12 and the correction lens 13 do not face each other while retracting from the front of the diffuser 12. Move to be located at. In the retracted position P2, it can be exchanged with another holder holding another correction lens. Note that the present invention is not limited to this mode, and any configuration that can be replaced with another correction lens may be used.

  The correction lens 13 includes conditions relating to the display area WA of the windshield W, such as the distance L (FIG. 1) between the projection lens 22 of the projection optical system 20 and the display area WA, the installation angle S of the display area WA, and the display area WA. The distance is selected according to at least one of the distance to the driver's face and eyes, the plane area of the display area WA, and the projection magnification, and particularly according to at least one of the distance L and the installation angle S. Selected. This makes it possible to mount a holder that holds a correction optical system having a different configuration and optical characteristics according to the type of vehicle on which the head-up display device 10 is mounted. More specifically, the output from the intermediate image display body formed by the diffuser 12 corresponds to the difference in the distance and direction between the head-up display device 10 and the windshield W or the driver's eyes depending on the vehicle type. The incident light is corrected by the correction lens 13. Here, the correction by the correction lens 13 includes correction of the optical path and optical characteristics of the emitted light from the intermediate image display body. As a result, an image corresponding to the intermediate image formed by the diffuser 12 can be accurately projected onto the windshield W without changing the arrangement relationship of the optical engine 11, the diffuser 12, and the projection optical system 20. A virtual image corresponding to the projection image can be formed in front of the windshield W.

  As shown in FIG. 2B, when the holder 14 is at the facing position P1, the correction lens 13 is positioned in the vicinity of the diffuser 12. That is, the exit surface 12a of the diffuser 12 and the entrance surface 13a of the correction lens 13 are at a distance such that a certain ratio or more, for example, 98% or more of the light emitted from the exit surface 12a of the diffuser 12 enters the correction lens 13. Opposite. As a result, it is possible to make all the scattered light, which is emitted from the diffuser 12, incident on the correction lens 13 without increasing the size in the plane orthogonal to the optical axis 13c of the correction lens 13, and to be mounted. The distortion of the image can be corrected according to the type of the vehicle, so that the image quality of the intermediate image formed on the diffuser 12 can be given to the projection mirror 21 side without degrading.

  The correction optical system may be composed of a plurality of lenses instead of a single lens such as the correction lens 13 described above. In this case, the condensing function and the distortion correction function may be provided in different lenses. Furthermore, a lens having a function of enlargement or reduction may be included.

  Image light including an image formed on the diffuser 12 and further corrected by the correction lens 13 is incident on the projection mirror 21 of the projection optical system 20. The projection optical system 20 includes two projection mirrors 21 and 22. By using a projection mirror as the projection optical system, various optical aberrations can be easily suppressed as compared to an enlarged projection optical system using a lens. Further, since the image light is enlarged while bending the optical path using two projection mirrors, the size of the arrangement of the projection optical system can be reduced.

  As shown in FIG. 1, the projection mirror 21 is a concave mirror (magnifying mirror) having a reflecting surface 21r on the correction lens 13 side. Image light including the image corrected by the correction lens 13 is magnified and reflected by the projection mirror 21. As shown in FIG. 1, the projection mirror 22 is a concave mirror (magnifying mirror) having a reflecting surface 22r on the projection mirror 21 side. Image light including the image reflected by the projection mirror 21 is magnified and reflected by the projection mirror 22.

The reflected light of the projection mirror 22 is projected onto the display area WA of the windshield W of the vehicle as the projection target. Since the windshield W functions as a semi-reflective surface, the incident image light is reflected toward the driver as the subject, and a virtual image is formed at the front position P of the windshield W. In E, it appears that information corresponding to the intermediate image formed on the diffuser 12 is displayed in front of the steering wheel.
Here, as shown in FIG. 1, the display area WA forms an inclination angle S upward with respect to a horizontal plane H orthogonal to the direction of gravity. The display area WA has a rectangular planar shape, and the distance from the center position to the center position of the reflection surface 22r of the projection mirror 22 is L.

  The projection optical system may be configured by combining a plurality of concave mirrors and reflecting mirrors instead of the two concave mirrors as in the projection optical system 20 having the configuration shown in FIG. For example, in the case of one reflecting mirror and one concave mirror, the light emitted from the correction lens 13 is reflected by the reflecting mirror to change its traveling direction, and the light from the reflecting mirror is magnified and reflected by the concave mirror. Projected onto the windshield W. This increases the degree of freedom of arrangement of each member, and makes it easier to design the size and shape of the device.

  In the above embodiment, the reflected light from the projection mirror 22 is projected onto the windshield W as the projection target. However, a combiner is arranged inside the windshield W as the projection target, and the projection mirror 22 It is also possible to project the reflected light on the combiner. In this configuration, since the combiner functions as a semi-reflective surface, the incident image light is reflected toward the driver as the subject and a virtual image is formed at the front position P of the windshield W.

Examples will be described below.
Example 1
In the first embodiment, the correction lens disposed between the diffuser 12 and the projection mirror 21 is the correction lens 13 shown in FIGS. 1 and 2A and 2B. The correction lens 13 is assumed to be installed in an SUV (Sports Utility Vehicle) under the following conditions.
(1) Inclination angle S of windshield W with respect to horizontal plane H of display area WA: 36 degrees (2) Projection magnification: 6.0 times (3) Center position of reflection surface 22r of projection mirror 22 from center position of display area WA Distance L: 173.7mm
Here, the projection magnification is the ratio of the diagonal line of the image formed in the display area WA of the windshield W to the diagonal line length of the image formed on the diffuser 12.

(Example 2)
FIG. 3A is a perspective view illustrating the configuration of the correction lens 33 according to the second embodiment, and FIG. 3B is a side view illustrating the configuration of the correction lens 33 illustrated in FIG.
The correction lens in Example 2 is the correction lens 33 shown in FIGS. 3 (A) and 3 (B). The correction lens 33 is a plano-convex positive lens disposed on the optical path from the exit surface 12a of the diffuser 12 to the projection optical system 20 along the direction T, similarly to the correction lens 13 of the first embodiment. In the correction lens 33, the entrance surface 33a from the diffuser 12 side is a flat surface, the exit surface 33b to the projection optical system 20 side is convex toward the projection optical system 20, and its optical axis 33c is the light of the diffuser 12. It arrange | positions so that it may overlap with the extended line of the axis | shaft 12c. The correction lens 33 is assumed to be installed on the sedan under the following conditions.
(1) Inclination angle S with respect to the horizontal plane H of the display area WA of the windshield W: 34 degrees (2) Projection magnification: 5.96 times (3) From the center position of the display area WA to the center position of the reflecting surface 22r of the projection mirror 22 Distance L: 170.3mm

(Example 3)
FIG. 4A is a perspective view illustrating the configuration of the correction lens 43 according to the third embodiment, and FIG. 4B is a side view illustrating the configuration of the correction lens 43 illustrated in FIG.
The correction lens in Example 3 is the correction lens 43 shown in FIGS. 4 (A) and 4 (B). The correction lens 43 is a plano-convex positive lens disposed on the optical path from the exit surface 12a of the diffuser 12 to the projection optical system 20 along the direction T, similarly to the correction lens 13 of the first embodiment. In the correction lens 43, the entrance surface 43a from the diffuser 12 side is a flat surface, the exit surface 43b to the projection optical system 20 side is convex toward the projection optical system 20, and its optical axis 43c is the light of the diffuser 12. It arrange | positions so that it may overlap with the extended line of the axis | shaft 12c. The correction lens 43 is assumed to be installed in a sports car under the following conditions.
(1) Inclination angle S of the display area WA of the windshield W with respect to the horizontal plane H: 30 degrees (2) Projection magnification: 5.5 times (3) Center position of the reflection surface 22r of the projection mirror 22 from the center position of the display area WA Distance L: 155.4mm

(Comparative Example 1)
FIG. 5 is a side view showing a schematic configuration of the head-up display device 100 according to the first comparative example. 6A is a perspective view showing the configuration of the correction lens 103 in Comparative Example 1, and FIG. 6B is a side view showing the configuration of the correction lens 103 shown in FIG. 6A.
As shown in FIG. 5, the head-up display device 100 of the comparative example 1 is different from the head-up display device 10 shown in FIG. The configuration is the same except that the correction lens 103 is provided on the optical path to the shield W. 5 is a direction along an optical path from the center position of the reflection surface 22r of the projection mirror 22 to the center position of the display area WA.

The correction lens 103 of Comparative Example 1 is assumed to be installed in the SUV under the following conditions that are the same as those of Example 1.
(1) Inclination angle S of windshield W with respect to horizontal plane H of display area WA: 36 degrees (2) Projection magnification: 6.0 times (3) Center position of reflection surface 22r of projection mirror 22 from center position of display area WA Distance L: 173.7mm

  The correction lens 103 in the comparative example 1 is a flat lens arranged on the optical path where the reflected light from the reflecting surface 22r of the projection mirror 22 goes to the windshield W. In the correction lens 103, both the incident surface 103a from the projection mirror 22 side and the exit surface 103b to the windshield W side are flat surfaces, and the optical axis 103c thereof is arranged along the direction R.

(Comparative Examples 2 to 4)
The comparative example 2 has a configuration in which the correction lens 13 is not provided as compared with the first exemplary embodiment.
Compared to Example 2, Comparative Example 3 has a configuration in which the correction lens 33 is not provided.
The comparative example 4 has a configuration in which the correction lens 43 is not provided compared to the third embodiment.

  FIGS. 7 to 13 are diagrams showing image distortions when an intermediate image formed in a rectangular shape on the diffuser 12 is projected onto the position of the driver's face. Examples 1 to 3 and Comparative Example 1 are respectively shown in FIGS. Corresponds to ~ 4. (E) of each figure (FIG. 7 (E), FIG. 8 (E), FIG. 9 (E), FIG. 10 (E), FIG. 11 (E), FIG. 12 (E), FIG. 13 (E)) , The face is facing the front front, and the eye position (Eyepoint) is at the reference coordinates (X = 0, Y = 0). Here, the X coordinate is a horizontal coordinate, and the Y direction is a vertical coordinate.

On the other hand, in (A), (D), and (E) of each figure, the Y coordinate is +31.5, and the position of the driver's eyes is above the reference coordinates, (C), In (F) and (I), the Y coordinate is −31.5, and the position of the driver's eye is below the reference coordinate.
Further, in each of the drawings (A), (B), and (C), the X coordinate is +66.5, and the position of the driver's eyes is on the left side of the reference coordinates. (G), (H) In (I), the X coordinate is -66.5, and the position of the driver's eyes is on the right side of the reference coordinates.

  7 to 9 corresponding to Examples 1 to 3, respectively, it can be seen that all of them have little distortion and the correction lens shows a high correction effect. Further, comparing (E) of each figure with the other (A) to (D) and (F) to (I), even if the position of the driver's eyes is different, it is the same as the image at the reference coordinates. It turns out that it can suppress to the distortion of a grade. Moreover, when each of FIGS. 7A to 7I, FIGS. 8A to 8I, and FIGS. 9A to 9I are compared with each other, the correction effect is equivalent. It can be seen that an optimal correction effect can be obtained by selecting a correction lens in accordance with the inclination angle S of the display area WA and the distance L from the display area WA to the reflection surface 22r of the projection mirror 22.

  On the other hand, when FIG. 7 corresponding to Example 1 and FIG. 10 corresponding to Comparative Example 1 are compared, each of the images shown in FIG. 10 has a smaller area than the image shown in FIG. The distortion is increasing. Therefore, it can be seen that the position of the correction lens is preferably between the diffuser 12 and the projection mirror 21 rather than between the projection mirror 22 and the windshield W.

7 and 11, FIG. 8 and FIG. 12, and FIG. 9 and FIG. 13, the images shown in FIGS. 11 to 13 corresponding to Comparative Examples 2 to 4 all correspond to Examples 1 to 3. The area is smaller than the image to be displayed, and the distortion is increased. Therefore, it can be seen that an image with suppressed distortion can be obtained by arranging the correction lens.
Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above embodiment, and can be improved or changed within the scope of the purpose of the improvement or the idea of the present invention.

  As described above, the image display apparatus according to the present invention uses the same projection optical system while suppressing the change in the size of the correction optical system even when the distance between the display area and the projection optical system changes. This is useful in that it is possible to display images.

10 Head-up display device (image display device)
11 Optical Engine 12 Diffuser (Intermediate Image Display)
12a Emission surface 12c Optical axis 13 Correction lens (correction optical system)
13a Incident surface 13b Emission surface 13c Optical axis 14 Holder 20 Projection optical system 21, 22 Projection mirror 21r, 22r Reflective surface 33, 43 Correction lens 33a, 43a Incident surface 33b, 43b Emission surface 33c, 43c Optical axis H Horizontal plane L Distance P Front position P1 Opposite position P2 Retraction position S Inclination angle W Windshield WA Display area

Claims (6)

An intermediate image display body on which an intermediate image is formed;
A projection optical system that projects an image corresponding to the intermediate image onto a display area;
A correction optical system that is arranged at a predetermined position between the intermediate image display body and the projection optical system and corrects the light emitted from the intermediate image display body,
Based on the image projected on the display area, a virtual image that is visible to the subject is formed,
The image display apparatus according to claim 1, wherein the correction optical system is selected according to a condition related to the display area.   The image display apparatus according to claim 1, wherein the condition relating to the display area includes at least one of a distance between the display area and the projection optical system and an installation angle of the display area.   The image display apparatus according to claim 1, wherein the correction optical system is disposed in the vicinity of the intermediate image display body. The image display device is mounted in a vehicle,
The subject is a driver of the vehicle,
The display area is set to a windshield of the vehicle, or a combiner disposed inside the windshield,
The virtual image is formed in front of the windshield,
The image display device according to any one of claims 1 to 3, wherein the condition related to the display area is determined according to a type of the vehicle.   The correction optical system is held by a holder, and by mounting the holder, the correction optical system according to the condition relating to the display area is placed at the predetermined position between the intermediate image display body and the projection optical system. The image display device according to claim 1, wherein the image display device is arranged.   The image display apparatus according to claim 1, wherein the projection optical system includes at least two projection mirrors that magnify and reflect incident light.

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