JPH09133890A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an appreciator to appreciate and image with presence without being aware of the frame of the image both horizontally and vertically by composing the device of an image display plate which display a plane image reduced in the field in an object and a beltlike concave Fresnel lens. SOLUTION: A fish-eye lens image 2 is displayed matching the horizontal size of the image display plate 1. The concave Fresnel lens 3 is made beltlike by making a horizontally long Fresnel lens concave in the center in conformity with the size of the image display plate 1 and arranged so that the concave side faces the appreciator's side. The fish-eye lens image 2 displayed on this image display plate 1 is reduced in the field angle in the object space according to a relation of y=f.θ (θ: constant). When this fish-eye lens image 2 is appreciated through the concave Fresnel lens 3 which generating a concave virtual image 5 according to a relation of θ=g.y (g: constant), the appreciator 4 can appreciate a concave virtual image 5 reproducing the field angle in the object space in a beltlike shape having the horizontal part of a hemisphere cut.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for displaying a wide-angle image.

[0002]

2. Description of the Related Art FIG. 12 shows, for example, JP-A-4-18564.
FIG. 7 is a principle view of a conventional image display device shown in Japanese Patent Publication when viewed obliquely from above. In the figure, 1 is an image display plate, 2 is a fisheye lens image taken by a fisheye lens, and the view angle of the object space of about 180 ° is reduced and displayed on the image display plate 1. 4 is a viewer, 24 is a hemispherical Fresnel lens in which the center of the Fresnel lens is dented, and the hemispherical Fresnel lens is arranged with the concave side facing the viewer, and the viewing angle of the image from the fisheye lens image 2 is about 180. Generate a virtual image of °.

First, the fisheye lens image 2 displayed on the image display plate 1 will be described. FIG. 13 is a diagram showing a typical fisheye lens characteristic, where 25 is the fisheye lens, θ is the viewing angle of the object space, and y is the size of the fisheye lens image 2 projected on the image plane. The fish-eye lens 25 has a property different from that of an ordinary lens, and the size of the image is determined by the relationship of y = f · θ (f is a constant). Therefore, the viewing angle of the object space is reduced to form a flat image on the image field. can do. Most fish-eye lenses are lenses designed to reach an angle of view of 180 ° (or more).

Next, an image formed by the hemispherical Fresnel lens 24 will be described. FIG. 14 is a diagram showing an intersection as an example of a landscape, and FIG. 14A shows a landscape viewed from above,
FIG. 14B is a view from the front, and 26 is a video camera with a fisheye lens.

FIG. 15 is a diagram showing a fisheye lens image 2 obtained by photographing the landscape of the intersection shown in FIG. 14 with a video camera 26 having a fisheye lens. As shown in FIG. 15, the fisheye lens image 2 captured by the video camera with a fisheye lens 26
Is a plane image in which the viewing angle of the object space of 180 ° is reduced in the circle from the roads on the left and right to the ground beneath and the sky above. Therefore, generally, the left and right portions of the horizontally long image display plate 1 are not used for display. By the way, an image captured by a fisheye lens is generally displayed as a wide-angle real image that reproduces the viewing angle of an object space by projecting it on a spherical screen or a transparent hemisphere using the same fisheye lens.

Next, the hemispherical Fresnel lens 24 will be described. FIG. 16 is a diagram showing the generation of a wide-angle virtual image by the conventional hemispherical Fresnel lens, and is the same for all cross sections including the optical axis of the hemispherical Fresnel lens 24. FIG. 17 is a diagram showing a virtual image by a conventional image display device. In FIG. 16, 27 is a hemispherical virtual image, a is a point at the right end of the fisheye lens image 2, A is a point on the hemispherical virtual image 27 formed by the Fresnel lens 23 at point a, and d5 and d6 are fisheye lens image 2
, D5 and D6 are partial regions on the hemispherical virtual image 27 formed by the Fresnel lens 23 from the partial regions d5 and d6 of the fisheye lens image 2, respectively.

As shown in FIG. 16, the hemispherical Fresnel lens 24 has a hemispherical hemispherical shape from the fisheye lens image 2 in the relation of θ = g · y (g is a constant) depending on the Fresnel lens shape and the magnification setting for each part. The virtual image 27 can be generated. Therefore, for example, the point a at the right end of the fisheye lens image 2
Is imaged at the position of the point A of the hemispherical virtual image 27. And
If the partial areas d5 and d6 of the fisheye lens image 2 have the same size, the partial areas D5 and D6 on the hemispherical virtual image 27 are imaged so that the angles of view thereof are the same, so that the viewer 4 has the hemispherical virtual image 27. Can be viewed as shown in FIG. 17 as an image in which the viewing angle of an object space with an angle of view of 180 ° is reproduced.

As a result, the image display device shown in FIG. 12 displays a wide-angle virtual image with an angle of view of 180 °, so that it can be viewed without being aware of the frame of the image.

[0009]

The conventional image display apparatus displays an image of 180 ° or more, which is an unnecessarily large angle of view in the vertical direction with respect to a viewing angle at which a human is not aware of the frame of the image. Since the generated hemispherical Fresnel lens is used, only a part of the display area of the image display plate is used, which causes a problem that the image display device becomes large.

Further, since the image is reduced and reproduced in the relation of y = f.θ, the generated virtual image has the same resolution in the central portion and the peripheral portion, and the resolution of the central portion which occupies most of the information is increased. Even if it tries to do so, the resolution of the peripheral portion must be increased to give a sense of reality, so that there is a problem that the amount of image information becomes large.

Further, there is a problem that only a case of generating a virtual image from a fisheye lens image is taken into consideration, and a normal image is not taken into consideration.

There is also a problem that the use of mobile phones is not taken into consideration.

Further, there is a problem that the hemispherical Fresnel lens is difficult to manufacture.

The present invention has been made to solve the above problems, and a first object thereof is to make a frame of an image conscious in both horizontal and vertical directions without using a hemispherical Fresnel lens. An image display device capable of displaying a wide-angle image without a problem.

A second object is to change the resolution of the generated virtual image between the central portion and the peripheral portion so that the image information amount is constant and the resolution of the central portion of the virtual image can be improved. Is what you get.

A third object is to obtain an image display device capable of viewing a wide-angle image from a normal image.

A fourth object is to obtain an image display device that can be used in a portable manner.

A fifth object is to obtain the same effect as that of the Fresnel lens with an element which can be easily manufactured.

[0019]

An image display device according to the present invention includes an image display plate for displaying a planar image with a reduced viewing angle of an object space, and a concave surface for enlarging the viewing angle to generate a wide-angle concave virtual image. It is provided with a concave Fresnel lens in the form of a belt, which is formed by denting the center of a Fresnel lens that is long in the horizontal direction with the side facing the viewer.

Further, an image display plate for displaying a planar image in which the viewing angle of the object space is reduced so that it becomes smaller toward the periphery, and a concave surface for generating a wide-angle concave virtual image such that the angle of view increases toward the periphery. It is equipped with a concave Fresnel lens of unequal magnification with the side facing the viewer.

Further, the concave Fresnel lens is a cylindrical Fresnel lens curved in a cylindrical shape for enlarging the viewing angle and generating a wide-angle concave virtual image.

Further, a concave Fresnel lens of non-uniform magnification is used.
This is a non-equal magnification cylindrical Fresnel lens.

Further, an image display plate for displaying a plane image in which the viewing angle of the object space is reduced only in the horizontal direction, and a cylindrical surface shape for enlarging the viewing angle only in the horizontal direction to generate a wide-angle cylindrical virtual image. It has a horizontal wide-angle Fresnel lens.

Further, an image display plate for displaying a planar image in which the viewing angle of the object space is reduced such that the virtual image is reduced in the horizontal direction only toward the peripheral portion, and the angle of view is increased toward the peripheral portion of the wide-angle virtual image only in the horizontal direction. As described above, a non-equal magnification horizontal wide-angle Fresnel lens having a cylindrical shape for generating non-uniform magnification is provided.

The image displayed on the image display plate is a normal image whose viewing angle is not reduced.

Further, for the left and right eyes, an image display plate and a spectacle-like structure are provided with lenses for generating a wide-angle virtual image.

Further, the lens for generating a wide-angle virtual image is composed of a convex meniscus lens.

Further, the lens for generating a wide-angle virtual image is composed of a hologram lens.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION An image display device according to an embodiment of the present invention includes an image display plate for displaying a planar image with a reduced viewing angle in an object space and a wide-angle concave virtual image with a wide viewing angle. The concave Fresnel lens, which is long in the horizontal direction with the concave side facing the viewer, is formed into a band-shaped concave Fresnel lens. A wide-angle concave virtual image that reproduces the viewing angle can be generated.

Further, an image display plate for displaying a planar image in which the viewing angle of the object space is reduced so that it becomes smaller toward the periphery, and a wide-angle concave virtual image is generated so that the angle of view becomes larger toward the periphery. Since the concave side is composed of a concave Fresnel lens with a non-equal magnification facing the viewer side, the image information amount of the wide-angle concave virtual image that reproduces the viewing angle of the object space from the planar image displayed on the image display plate is constant. The resolution of the central portion of the concave virtual image can be improved.

Further, since the concave Fresnel lens is a cylindrical Fresnel lens curved in a cylindrical shape for enlarging the viewing angle and generating a wide-angle concave virtual image, the Fresnel lens is easy to manufacture. A wide-angle concave virtual image can be generated similarly to the concave Fresnel lens.

Further, a concave Fresnel lens of non-uniform magnification is used,
Since it is composed of the non-equal magnification cylindrical Fresnel lens, the amount of image information is constant and the resolution of the central portion of the concave virtual image can be improved.

Further, an image display plate for displaying a plane image in which the viewing angle of the object space is reduced only in the horizontal direction, and a cylindrical surface shape for expanding the viewing angle only in the horizontal direction to generate a virtual surface of the cylindrical surface. Since the horizontal wide-angle Fresnel lens described above is used, it is possible to generate a wide-angle cylindrical virtual image with the horizontal wide-angle Fresnel lens that is easy to manufacture.

Further, an image display plate for displaying a planar image in which the viewing angle of the object space is reduced so that the viewing angle of the object space is reduced only in the horizontal direction. Since it is composed of a non-uniform magnification horizontal wide-angle Fresnel lens having a cylindrical surface shape that is generated to have a large non-uniform magnification, the amount of image information is constant and the resolution of the central portion of the virtual image of the cylindrical surface can be improved.

Further, by setting the image displayed on the image display plate as a normal image in which the viewing angle is not reduced, the normal image can also be viewed as a wide-angle image.

Further, since the image display plates and the lenses for generating a wide-angle virtual image are formed in the shape of spectacles for the left and right eyes, a wide-angle image can be viewed with a device having the size of spectacles.

Further, since the lens for generating the wide-angle virtual image is composed of the convex meniscus lens, the manufacture becomes easy.

Further, since the lens for forming the wide-angle virtual image is composed of the hologram lens, the manufacture becomes easy.

The present invention will be specifically described below with reference to the drawings showing the embodiments thereof. Embodiment 1 FIG. FIG. 1 is a principle view of an image display device according to a first embodiment of the present invention as seen obliquely from above. In the figure, 1 is an image display plate, and 2 is a fisheye lens image, which is displayed in a size matched with the horizontal direction of the image display plate 1. Reference numeral 3 denotes a concave Fresnel lens, which has a horizontally long Fresnel lens indented at the center in accordance with the size of the image display plate 1 to form a belt shape, and the concave side is arranged facing the viewer. In FIG. 1, the Fresnel lens is tentatively drawn as a convex lens for the purpose of explaining the principle. 4 is a viewer and 5 is a concave virtual image.

Next, a virtual image by the image display device according to the first embodiment will be described with reference to FIG. As shown in FIG. 1, the fisheye lens image 2 displayed on the image display plate 1
Indicates that the viewing angle of the object space is reduced due to the relationship of y = f · θ (f is a constant). This fisheye lens image 2 is θ = g · y
Because of the relationship (g is a constant), when viewed with the concave Fresnel lens 3 that generates the concave virtual image 5, the viewer 4 as a concave virtual image 5 that reproduces the viewing angle of the object space in a strip shape like a horizontal portion of a hemisphere is cut off. Can be appreciated. The concave virtual image 5 can be viewed as an image corresponding to a wider viewing angle of a person in the horizontal direction than in the vertical direction.

Further, since the horizontal viewing angle is set larger than the vertical viewing angle, the fisheye lens image 2 generally fills the horizontal display area of the horizontally long (4: 3, 16: 9, etc.) image display plate 1. Can be displayed on a horizontal,
The resolution can be improved as compared with the case where the angle of view of 180 ° or more is displayed in both vertical directions.

Embodiment 2. In the second embodiment, the fish-eye lens image 2 and the concave Fresnel lens 3 of the first embodiment described above have a planar image in which the viewing angle of the object space is reduced so as to become smaller toward the periphery, and an image display plate is provided. It is a non-equal magnification concave Fresnel lens with the concave side facing the viewer, which produces a wide-angle virtual image with a larger angle of view toward the periphery, in the opposite relationship to the plane image to be displayed. .

FIG. 2 is a principle view showing an image display device according to a second embodiment of the present invention. FIG. 2A shows a plane image in which the viewing angle of the object space is reduced so that it becomes smaller toward the periphery. FIG. 2B is a diagram showing the generation of a wide-angle virtual image by the concave Fresnel lens of unequal magnification. In the figure, 6 is an example of a lens that can reduce the viewing angle of the object space so that it becomes smaller toward the periphery. The lens whose image size is determined by the relationship of y = f · θ ^1/2 (f is a constant) f [theta] ^1/2 lens defined as, 7 f [theta] ^1/2 lens image by f [theta] ^1/2 lens, 8 of unequal magnifications concave Fresnel lens for generating a virtual image so that the more the angle of view becomes periphery increases It is a concave gy ² lens whose image size is determined by the relationship of θ = g · y ² (g is a constant), which is an example. Such y and θ
Can be easily controlled by designing the inclination angle of the saw teeth of the Fresnel lens according to the place.

Next, a virtual image by the image display device according to the second embodiment will be described with reference to FIG. FIG.
As shown in (b), the fθ ^1/2 lens image 7 is θ = g ·
When viewed with the concave gy ² lens 8 that generates a virtual image in the relationship of y ² (g is a constant), the viewer 4 can view the concave virtual image 5. The concave virtual image 5 is enlarged so that more angles of view in a peripheral portion becomes large, but as shown in FIG. ^{2 (a), fθ 1/} 2 lens image 7 displayed on the image display panel 1, y = f・
Since the viewing angle of the object space is reduced such that it becomes smaller toward the periphery due to the relationship of θ ^1/2 (f is a constant), the concave virtual image 5 reproduces the viewing angle of the object space. Since the central portion has a lower enlargement ratio than the peripheral portion, the resolution can be displayed higher.

By the way, in FIG. 2, as an example of a plane image in which the viewing angle of the object space is reduced so that it becomes smaller toward the periphery, the size of the image is in the relation of y = fθ ^1/2 (f is a constant). As an example of a lens that generates a virtual image such that the angle of view becomes larger toward the peripheral portion in the opposite relationship to the fθ ^1/2 lens image where θ is determined, the image is obtained in the relationship of θ = g · y ² (g is a constant). Although the concave gy ² lens 8 whose size is determined is described, y = f · θ ^1/3 and θ = g · y ³ , y = f · sin θ
Needless to say, a lens that generates a concave virtual image with a plane image in which the viewing angle of the object space is reduced so that it becomes smaller toward the periphery, such as θ = g · sin ⁻¹ y, and vice versa. Nor.

Embodiment 3 In the third embodiment, the concave Fresnel lens of the first embodiment is a cylindrical Fresnel lens curved in a cylindrical shape for enlarging the viewing angle and generating a wide-angle concave virtual image. . FIG. 3 is a principle view of an image display device according to a third embodiment of the present invention as viewed obliquely from above. In the figure, 9 is a cylindrical Fresnel lens curved in a cylindrical shape.

Like the concave Fresnel lens 3, the cylindrical Fresnel lens 9 is formed by cutting the horizontal portion of the hemisphere in accordance with θ = g · y (g is a constant), depending on the bending shape and the magnification setting for each part. A concave virtual image 5 that reproduces the viewing angle of the object space in a strip shape is generated. Also, because it is cylindrical, it can be easily manufactured by bending a flat Fresnel fisheye lens.

Embodiment 4 In the fourth embodiment, the non-equal-magnification concave Fresnel lens of the second embodiment has the opposite relationship to the plane image displayed on the image display plate, and the angle of view increases as the wide-angle virtual image becomes closer to the peripheral portion. This is a non-equal-magnification cylindrical Fresnel lens having a non-uniform magnification. FIG. 4 is a principle view of an image display device according to a fourth embodiment of the present invention when viewed obliquely from above. In the figure, 10 is a non-uniform magnification cylinder for generating a virtual image such that the angle of view becomes larger toward the peripheral portion. An example of a planar Fresnel lens, only in the horizontal direction θ = g
Cylindrical shape g in which the size of the image is determined by the relationship of y ² (g is a constant)
y ² lens.

The cylindrical surface shape gy ² lens 10, the f [theta] ^1/2 lens image 7 as with concave gy ² lens 8 in the horizontal direction θ
= G · y ² (g is a constant), the concave virtual image 5 having a large angle of view is generated, so that the same effect as in the second embodiment can be obtained. Also, since it is cylindrical, it is a flat Fresnel f
It can be easily manufactured by bending the θ ² lens.

By the way, in FIG. 4, as an example of an image in which the viewing angle of the object space is reduced so that it becomes smaller toward the periphery, the size of the image has a relation of y = fθ ^1/2 (f is a constant). As an example of a fθ ^1/2 lens image that determines the angle and a lens that generates a virtual image such that the angle of view increases toward the peripheral portion only in the horizontal direction, the relation of θ = g · y ² (g is a constant) only in the horizontal direction The configuration with a cylindrical gy ² lens whose image size is determined by has been described above. However, a planar image in which the viewing angle of the object space is reduced so that it becomes smaller toward the periphery and a concave surface in the opposite relationship only in the horizontal direction. It goes without saying that any lens can be used as long as it produces a virtual image.

Embodiment 5. In the fifth embodiment, an image display plate that displays a planar image in which the viewing angle of the object space is reduced only in the horizontal direction, and a horizontal wide-angle image that expands the viewing angle only in the horizontal direction to generate a wide-angle cylindrical virtual image. The Fresnel lens is composed of 5 is a principle diagram showing an image display device according to a fifth embodiment of the present invention. FIG. 5 (a) shows a plane image in which the viewing angle of the object space is reduced only in the horizontal direction.
(B) is a figure which shows generation | occurrence | production of the wide-angle cylindrical virtual image by a horizontal widening Fresnel lens.

In the figure, 11 is y = f.multidot.only in the horizontal direction.
A horizontal fθ lens that reduces the viewing angle of the object space in the relationship of θ (f is a constant), 12 is a horizontal fθ lens image, 13 is a relationship of θ = g · y (g is a constant) in the vertical direction, and 13 is a vertical direction. Is a horizontal wide-angle Fresnel lens that generates a virtual cylindrical surface image enlarged by the relationship of a normal convex lens characteristic of arbitrary magnification, 14 is a virtual cylindrical surface image, S1 and S2 are partial regions in which the viewing angle of the object space is viewed on the cylindrical surface, s1 , S2 are partial regions on the horizontal fθ lens image 12 formed by the horizontal fθ lens 11 of the partial regions S1 and S2 in which the viewing angle of the object space is seen as a cylindrical surface, and d1 and d2, respectively.
Is a partial area of the horizontal fθ lens image 12, and D1 and D2 are partial areas of the cylindrical virtual image 14 formed by the horizontal widening Fresnel lens 13 from the partial areas d1 and d2 of the horizontal fθ lens image 12, respectively.

Next, a virtual image by the image display device according to the fifth embodiment will be described with reference to FIG. FIG.
As shown in (a), the horizontal f displayed on the image display plate 1 is displayed.
The θ lens image 12 is a horizontal fθ lens image 1 when the partial areas S1 and S2 in which the viewing angle of the object space is seen in a cylindrical shape are equal.
Since the viewing angle of the object space is reduced so that the partial areas s1 and s above 2 are equal, as shown in FIG. 5B, when the partial areas d1 and d2 of the horizontal fθ lens image 12 are equal, Since the partial areas D1 and D2 of the cylindrical virtual image 14 generated by the horizontal widening Fresnel lens 13 are generated in the cylindrical shape so as to be equal to each other, the cylindrical virtual image 14 can reproduce the viewing angle of the object space. In addition, horizontal wide-angle Fresnel lens 1
Since 3 is a cylindrical surface, it can be easily manufactured by bending an ordinary flat plate Fresnel lens.

Embodiment 6 FIG. In the sixth embodiment, an image display plate displaying a planar image in which the viewing angle of the object space is reduced so that the horizontal direction becomes smaller toward the periphery, and a planar image displayed by the image display plate only in the horizontal direction are opposite. In view of the above, a wide-angle cylindrical virtual image is formed by a cylindrical non-uniform magnification horizontal wide-angle Fresnel lens that produces a larger angle of view toward the periphery. FIG. 6 is a principle diagram showing an image display device according to a sixth embodiment of the present invention. FIG. 6 (a) shows a planar image in which the viewing angle of the object space is reduced so that it becomes smaller toward the peripheral portion only in the horizontal direction. FIG. 6B is a diagram showing generation of a wide-angle cylindrical virtual image by the cylindrical nonuniform magnification horizontal wide-angle Fresnel lens.

In the figure, reference numeral 15 is an example of a lens capable of reducing the viewing angle of the object space so that it becomes smaller toward the peripheral portion only in the horizontal direction. Only in the horizontal direction, y = f.θ ^1/2 (f is a constant). horizontal f [theta] ^1/2 lens the size of the image is determined in, 16 horizontal f [theta] ^1/2 lens image by the horizontal f [theta] ^1/2 lens, 17 in the horizontal direction only cylindrical surface virtual image as the angle of view as comprising a peripheral portion is increased Which is an example of a non-equal magnification horizontal wide-angle Fresnel lens for generating
² (g is a constant) in relation to the vertical direction is horizontal gy ² which determines the size of the image in relation to the normal convex lens characteristics of an arbitrary ratio
Lenses, d3 and d4 are partial areas of the horizontal fθ ^1/2 lens image 16, D3 and D4 are cylindrical virtual images formed by the horizontal gy ² lens 17 of partial areas d3 and d4 of the horizontal fθ ^1/2 lens image 16, respectively. 14 partial areas.

Next, a virtual image by the image display device according to the sixth embodiment will be described with reference to FIG. FIG.
As shown in (a), the horizontal f displayed on the image display plate 1 is displayed.
In the θ ^1/2 lens image 16, the viewing angle of the object space is reduced in a cylindrical shape such that it becomes smaller toward the peripheral portion only in the horizontal direction due to the relationship of y = f · θ ^1/2 (f is a constant). So Figure 6
As shown in (b), the cylindrical surface virtual image 14 formed in a cylindrical shape.
Is a horizontal gy ² lens 17 only in the horizontal direction θ = g · y
Since it is generated in the relationship of ² (g is a constant), the viewing angle of the object space can be reproduced in a cylindrical shape. Since the enlargement ratio from the partial region d1 in the central portion of the virtual surface 14 to the partial region D1 is set lower than the enlargement ratio from the partial regions d2 and D2 in the peripheral portion, high resolution can be displayed. Also, since it is cylindrical, it can be easily manufactured by bending an ordinary flat plate Fresnel lens.

Embodiment 7 FIG. The seventh embodiment includes an image display plate that displays a normal image and a lens that generates a wide-angle virtual image from the normal image displayed by the image display plate. FIG. 7 is a principle diagram showing an example of an image display device according to a seventh embodiment of the present invention, which is composed of an image display plate 1 for displaying a normal image and a horizontal wide-angle Fresnel lens 13.

FIG. 8 is a principle view showing another example of the image display device according to the seventh embodiment of the present invention, which is composed of an image display plate 1 for displaying a normal image and a horizontal gy ² lens 17. . 7 and 8 (a) show generation of a wide-angle cylindrical virtual image, and FIGS. 7 (b) and 8 (b) show images of a vehicle running on the road in the center of the image as an example of normal images.
(C) shows a cylindrical virtual image generated from the normal images of FIGS. 7 and 8 (b). In the figure, 18 is a normal image.

Next, a virtual image by the image display device according to the seventh embodiment will be described with reference to FIG. FIG.
The normal image 18 in (b) is viewed by the viewer 4 as a wide-angle cylindrical virtual image 14 as shown in FIG. 7 (a). At this time, as shown in FIG. 7C, the cylindrical virtual image 14 is the normal image 1
Since the image is displayed by bending 8 into a cylindrical shape, it can be viewed as a wide-angle image.

In the example shown in FIG. 7, the normal image 18 can be viewed as a wide-angle image, but the peripheral portion appears to shrink when viewed from the front, so the central portion occupies most of the information and the peripheral portion is present. In the case of a display content that only gives a feeling, it is more natural to display the peripheral portion in an enlarged manner than the central portion. Therefore, as shown in FIG. 8, if an image display device is constituted by the image display plate 1 displaying a normal image and the horizontal gy ² lens 17, as shown in FIG. 8C, a normal image 18 is generated. The wide-angle cylindrical virtual image 14 is generated by enlarging so that it becomes larger toward the peripheral portion only in the horizontal direction, so that it can be viewed as a wider-angle image that is more natural than the example of FIG. 7.

Embodiment 8 FIG. In the eighth embodiment, an image display plate and lenses for generating a wide-angle virtual image are provided for the left and right eyes of a viewer, and the configuration is configured like glasses. FIG. 9 is a principle diagram showing an example of an eyeglass-type image display device according to an eighth embodiment of the present invention. In the figure, reference numeral 19 is an eyeglass-type image display device, which is composed of image display plates 1L and 1R for the left and right eyes and concave Fresnel lenses 3L and 3R for the left and right eyes, which display the fisheye lens image 2 respectively. .

The eyeglass-type image display device 19 has fisheye lens images 2 and 2 displayed on the image display plates 1L and 1R, respectively.
Therefore, the concave Fresnel lenses 3L and 3R can generate a wide-angle virtual image so as to cover the left and right eyes of the viewer. By the way, in FIG. 9, the image display device of the first embodiment is shown as the eyeglass-type image display device, but the image display devices of the second to seventh embodiments are replaced with the eyeglass-type image display device. It goes without saying that it may be configured as.

Embodiment 9 FIG. In the ninth embodiment, a lens that generates a wide-angle virtual image is composed of a convex meniscus lens. FIG. 10 is a principle view showing an image display device configured by a convex meniscus lens according to a ninth embodiment of the present invention. FIG. 10A shows a concave convex meniscus lens 20.
FIG. 10 (b) is provided with a cylindrical convex meniscus lens 21. The concave convex meniscus lens 20 has the same characteristics as the concave Fresnel lens 3 and the concave gy ² lens 8. The cylindrical convex meniscus lens 21 has a cylindrical Fresnel lens 9, a cylindrical gy ² lens 11, and a horizontal lens. Since it has the same characteristics as the wide-angle Fresnel lens 13, the horizontal wide-angle gy ² lens 17, and the like, a wide-angle virtual image can be generated, and the weight of the device can be reduced.

Embodiment 10 FIG. In the tenth embodiment, a lens that generates a wide-angle virtual image is a hologram lens. FIG. 11 is a principle view showing an image display device constituted by a hologram lens according to a ninth embodiment of the present invention. FIG. 11 (a) shows a concave hologram lens 22 and FIG. 11 (b) shows a cylindrical hologram lens. It is equipped with 23. The concave hologram lens 22 has the same characteristics as the concave Fresnel lens 3, the concave gy ² lens 8 and the like,
Since the tubular hologram lens 23 has the same characteristics as the tubular Fresnel lens 9, the tubular gy ² lens 11, the horizontal widening Fresnel lens 13, the horizontal widening gy ² lens 17, etc., a wide-angle virtual image can be generated. Moreover, the device can be made lighter.

By the way, in each of the above-described embodiments, the description has been made in the case where the field angle of the generated virtual image is 180 ° or more in the horizontal direction, but the wide field of view improves the sense of presence and the like. It goes without saying that the effect can be obtained even when the angle is 180 ° or less.

In each of the above embodiments, the virtual image generated is described as being imaged at equal distances. However, for example, the central part is close to the viewer and the peripheral part is imaged far. It goes without saying that even with a lens that forms a virtual image at a non-equidistant angle and a wide angle, the effect of improving the sense of presence and the like can be obtained by increasing the angle of view.

Needless to say, the image display plate can be not only a display plate such as an LCD or a plasma display, but also a CRT or a rear projection type projector. Further, it goes without saying that a lens coating for eliminating the influence of external light, an outer box, and the like may be provided.

[0068]

Since the present invention is configured as described above, it has the following effects.

Since the image display plate for displaying a flat image in which the viewing angle of the object space is reduced and the concave Fresnel lens in the shape of a band are used, the image can be displayed in both horizontal and vertical directions from the flat image displayed by the image display plate. It is possible to generate a wide-angle concave virtual image without being conscious of the frame of, so that the observer can appreciate a realistic image.

Further, an image display plate for displaying a planar image in which the viewing angle of the object space is reduced so that it becomes smaller toward the peripheral portion, and a wide-angle virtual image is imaged toward the peripheral portion from the planar image displayed by the image display plate. Since it is composed of a non-uniform magnification concave Fresnel lens that produces a large angle, the image information amount is constant and the resolution of the central portion of the concave virtual image can be improved. Therefore, signal compression in transmission etc. should be achieved. You can

Further, since the concave Fresnel lens is a cylindrical Fresnel lens curved in a cylindrical shape for enlarging the viewing angle and generating a wide-angle concave virtual image, the Fresnel lens is easy to manufacture. As with the concave Fresnel lens, a wide-angle concave virtual image can be generated, and thus the cost of the image display device can be reduced.

Further, a concave Fresnel lens having a non-uniform magnification is
Since it is composed of a non-equal magnification cylindrical Fresnel lens, the amount of image information is constant and the resolution of the central portion of the concave virtual image can be improved. Therefore, signal compression in transmission and cost reduction of the image display device can be achieved at the same time. Can be planned.

Further, an image display plate for displaying a planar image in which the viewing angle of the object space is reduced only in the horizontal direction, and a cylindrical surface shape for expanding the viewing angle only in the horizontal direction to generate a virtual virtual surface of the cylindrical surface. Since it is composed of the horizontal wide-angle Fresnel lens, it is possible to generate a wide-angle cylindrical virtual image with a cylindrical wide-angle horizontal wide-angle Fresnel lens that can be easily manufactured. Therefore, the cost of the image display device can be reduced. .

Further, an image display plate for displaying a planar image in which the viewing angle of the object space is reduced so that the horizontal direction becomes smaller toward the peripheral portion, and the view angle becomes wider toward the peripheral portion of the cylindrical virtual image having a wide angle only in the horizontal direction. Since it is composed of a non-equal-magnification horizontal wide-angle Fresnel lens that produces a non-uniform magnification so as to be large, it is possible to improve the resolution of the central portion of the virtual virtual image with a constant amount of image information. It is possible to simultaneously achieve signal compression in transmission and cost reduction of the image display device.

Further, since the image displayed on the image display plate is the normal image in which the viewing angle is not reduced, the normal image can be viewed as a wide-angle image. Therefore, the usable range of the display image is widened. be able to.

Further, since the image display plates and the lenses for generating a wide-angle virtual image are formed in the shape of spectacles for the left and right eyes, the image can be viewed as a wide-angle image with the size of the spectacles, and it can be used for portable use. can do.

Further, since the lens for generating the wide-angle virtual image is composed of the convex meniscus lens, the manufacture becomes easy,
Therefore, the cost of the image display device can be reduced.

Further, since the lens for forming the wide-angle virtual image is composed of the hologram lens, it is easy to manufacture, so that the cost of the image display device can be reduced.

[Brief description of the drawings]

FIG. 1 is a principle view of an image display device according to a first embodiment of the present invention when viewed obliquely from above.

FIG. 2 is a principle diagram showing an image display device according to a second embodiment of the present invention.

FIG. 3 is a principle view of an image display device according to a third embodiment of the present invention when viewed obliquely from above.

FIG. 4 is a principle view of an image display device according to a fourth embodiment of the present invention when viewed obliquely from above.

FIG. 5 is a principle diagram showing an image display device according to a fifth embodiment of the present invention.

FIG. 6 is a principle diagram showing an image display device according to a sixth embodiment of the present invention.

FIG. 7 is a principle diagram showing an image display device according to a seventh embodiment of the present invention.

FIG. 8 is a principle diagram showing another example of the image display device according to the seventh embodiment of the present invention.

FIG. 9 is a principle diagram showing an eyeglass-type image display device according to an eighth embodiment of the present invention.

FIG. 10 is a principle diagram showing an eyeglass-type image display device according to a ninth embodiment of the present invention.

FIG. 11 is a principle diagram showing an eyeglass-type image display device according to a tenth embodiment of the present invention.

FIG. 12 is a principle view of a conventional image display device as seen from diagonally above.

FIG. 13 is a diagram showing fisheye lens characteristics.

FIG. 14 is a diagram showing an intersection as an example of a landscape.

FIG. 15 is a diagram showing a fisheye lens image obtained by photographing a landscape at an intersection with a fisheye lens.

FIG. 16 is a diagram showing generation of a wide-angle virtual image by a conventional Fresnel lens.

FIG. 17 is a diagram showing a virtual image by a conventional image display device.

[Explanation of symbols]

1 image display plate, 2 fisheye lens image, 3 concave Fresnel lens, 4 viewer, 5 concave virtual image, 6 fθ ^1/2
Lens, 7 fθ ^1/2 lens image, 8 concave gy ² lens, 9 cylindrical Fresnel lens, 10 cylindrical gy ² lens, 11 horizontal fθ lens, 12 horizontal fθ lens image, 13 horizontal wide-angle Fresnel lens, 14 cylindrical virtual image, 15 horizontal fθ ^1/2 lens, 16 horizontal fθ ^1/2 lens image, 17 horizontal gy ² lens, 18 normal image, 1
9 Eyeglass-type image display device, 20 concave convex meniscus lens, 21 cylindrical convex meniscus lens, 22 concave hologram lens, 23 cylindrical hologram lens, 24
Hemispherical Fresnel lens, 25 fisheye lens, 26 video camera with fisheye lens, 27 hemispherical virtual image.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomohiro Ando 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Shinobu Kawajiri 2-6-2 Otemachi, Chiyoda-ku, Tokyo Sanryo Electric Engineering Co., Ltd. (72) Inventor Eiichi Tode 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd.

Claims (10)

[Claims] 1. An image display plate for reducing a viewing angle of an object space to display a planar image, and a lens for expanding a viewing angle from a planar image displayed by the image display plate to generate a wide-angle concave virtual image. The image display is characterized in that the lens is a concave Fresnel lens in the form of a band formed by denting the center of a Fresnel lens that is long in the horizontal direction, and the concave side is arranged facing the viewer. apparatus. 2. An image display plate for displaying a planar image in which a viewing angle of an object space is reduced so that the peripheral portion is made smaller, and a wide-angle concave virtual image from the planar image displayed by the image display plate is disposed as a peripheral portion. An image display device comprising: a non-equal magnification concave Fresnel lens that produces non-equal magnification so that the angle of view becomes large. 3. The Fresnel lens having a concave surface is a cylindrical Fresnel lens curved in a cylindrical shape for enlarging a viewing angle and generating a wide-angle concave virtual image.
The image display device as described in the above. 4. The non-equal magnification concave Fresnel lens,
The image display apparatus according to claim 2, wherein the image display apparatus is a non-equal magnification cylindrical Fresnel lens. 5. An image display plate for displaying a planar image in which the viewing angle of the object space is reduced only in the horizontal direction, and a viewing angle is enlarged only in the horizontal direction from the planar image displayed by the image display plate to be a wide angle. An image display device comprising a cylindrical wide-angle wide-angle Fresnel lens for generating a virtual image on a cylindrical surface. 6. An image display plate for displaying a plane image in which the viewing angle of the object space is reduced so that the size becomes smaller toward the peripheral portion only in the horizontal direction, and a virtual image having a wide angle only in the horizontal direction from the plane image displayed by the image display plate. An image display device, comprising: a non-uniform magnification horizontal wide-angle Fresnel lens formed in a cylindrical shape that produces a non-uniform magnification such that the angle of view increases toward the periphery. 7. The image display device according to claim 1, wherein the image displayed on the image display plate is a normal image whose viewing angle is not reduced. 8. The image according to claim 1, wherein the image display plate and the lens for generating a wide-angle virtual image are configured like glasses for the left and right eyes. Display device. 9. The image display device according to claim 1, wherein the lens that generates a wide-angle virtual image is a convex meniscus lens. 10. The image display device according to claim 1, wherein the lens that generates a wide-angle virtual image is a hologram lens.