JP2012027273A - Lens device and display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide images with a high realistic feeling.SOLUTION: A display system comprises: a display panel for displaying an image; and a lens device which is arranged at a position which is nearer to a view point between the view point and the display panel and creates a virtual image into which the display panel is expanded at a position which is more apart from the view point than the display panel. The lens device comprises: a Fresnel lens; a transparent plate bonded to a lens surface of the Fresnel lens; and a support part for supporting the Fresnel lens and the transparent plate in the standing state at a position apart from the display panel.

Description

  The present invention relates to a lens device and a display system for viewing an image displayed on a display device.

  In recent years, there has been a demand for a display that provides a highly realistic image. For example, it is said that when the display size is increased, an image with a high presence can be provided.

  By the way, the price increases as the display size is increased. Therefore, a display system that can enhance the sense of reality at a lower cost is required.

  In order to solve the above-mentioned problem, in the first aspect of the present invention, there is provided a lens device for viewing the display surface of a display device, comprising a Fresnel lens and a transparent adhesive bonded to the lens surface of the Fresnel lens. A lens device including the plate and a display system are provided.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

An example of the display system 10 which concerns on this embodiment is shown. 1 shows an example of a display system 10 according to the present embodiment that provides images to a plurality of viewers. An arrangement example of the display panel 20, the virtual image 40, and the flat lens 50 according to the present embodiment is shown. An example of a cross-sectional structure of the planar lens 50 according to the present embodiment is shown. An example of the cross-sectional shape of the Fresnel lens 60 is shown. The structure of the lens apparatus 30 which concerns on a modification is shown.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  The display system 10 provides a two-dimensional image or a three-dimensional image to one or a plurality of viewers. The display system 10 includes a display panel 20, a lens device 30, a chair 32, and a table 34.

  The display panel 20 displays a two-dimensional image or a three-dimensional image. The display panel 20 is a flat display device as an example.

  The lens device 30 is a lens that allows a viewer to view the display surface of the display panel 20, and is disposed at a position closer to the viewpoint side between the viewpoint (that is, the position of the eyes of the viewer) and the display panel 20. Is done. Then, the lens device 30 generates a virtual image 40 in which the display panel 20 is enlarged at a position farther from the viewpoint than the display panel 20. That is, the lens device 30 generates a virtual image 40 in which the display panel 20 is enlarged at a position farther than the distance from the viewpoint to the display panel 20.

  The lens device 30 includes a planar lens 50, an outer frame portion 52, and a support portion 54. As an example, the planar lens 50 is a convex planar lens that generates the virtual image 40.

  As an example, the planar lens 50 has a structure in which a Fresnel lens and a transparent plate are bonded together. As an example, the planar lens 50 has a rectangular flat plate shape. As an example, the flat lens 50 has a vertical / horizontal ratio substantially the same as the display surface of the display panel 20.

  The planar lens 50 is disposed so that the plane is substantially parallel to the display surface of the display panel 20. As an example, the planar lens 50 is disposed so that the center of the plane is located on a line connecting the viewpoint and the center of the display surface of the display panel 20.

  Such a planar lens 50 has a predetermined magnification. As an example, the planar lens 50 has an enlargement ratio of 1.5 times or more.

  The outer frame portion 52 is provided on the outer periphery of the flat lens 50 and hides at least a part of the outer peripheral portion of the display surface of the display panel 20 from the viewpoint. As an example, the outer frame portion 52 is provided on at least a part of the upper side, the lower side, the right side, and the left side of the flat lens 50.

  By having such an outer frame portion 52, the lens device 30 can shield the peripheral portion of the virtual image 40 of the display panel 20 from the viewpoint. Thereby, the lens apparatus 30 can isolate | separate the virtual image 40 of the display panel 20 from the circumference | surroundings, and can show the virtual image 40 to a viewer naturally like an actual display surface.

  The support unit 54 supports the flat lens 50 at a position away from the display panel 20 so that the flat lens 50 is substantially parallel to the display panel 20. For example, the support unit 54 supports the planar lens 50 in a state in which the planar lens 50 stands vertically on the table 34.

  The chair 32 is seated on the viewer and fixes the viewer's viewpoint. As an example, the chair 32 is provided at a position where the distance from the viewer's viewpoint to the display panel 20 is a predetermined distance.

  The table 34 is disposed between the display panel 20 and the chair 32, and the lens device 30 is placed thereon. The table 34 can arrange the lens device 30 at a position close to the viewpoint side between the viewpoint and the display surface of the display panel 20.

  In such a display system 10, a viewer can view the display panel 20 through the lens device 30. In this case, the viewing distance from the viewpoint to the display panel 20 when viewing the display panel 20 through the lens device 30 is, for example, 0.7 of the standard viewing distance when viewing the display panel 20 without using the lens device 30. It is 2 times or more.

  The standard viewing distance of the display panel 20 is about three times the vertical length of the display panel 20. Also, the minimum viewing distance is said to be about twice the vertical length of the display panel 20 when the screen size is 60 inches or more. There is also a survey result that the preferred viewing distance of the display is about 6 times the vertical length of the display panel 20. Therefore, when viewing the display panel 20 through the lens device 30, the viewing distance from the viewpoint to the display panel 20 is 2 to 6 times the vertical length of the display panel 20 so that the standard viewing is performed. For example, the distance is preferably 0.7 times or more and 2 times or less.

  Then, the mounting position on the table 34 is adjusted so that the virtual image 40 obtained by enlarging the display panel 20 is generated at a position farther from the viewpoint than the display panel 20. Furthermore, the lens device 30 generates a virtual image 40 in which the viewing angle (that is, the angle of view) of the virtual image 40 with respect to the viewpoint is larger than the viewing angle of the display panel 20 with respect to the viewpoint. Thereby, the lens apparatus 30 can give a high sense of presence similar to the case where the size of the display panel 20 is increased to the viewer.

  In addition, the lens device 30 generates a virtual image 40 at a position 3 m or more away from the viewpoint. The lens device 30 may generate the virtual image 40 in a range from 1 m to 3 m from the viewpoint.

  It is said that when a human visually recognizes the depth of an object that is 3 m or more away, there is almost no influence of binocular parallax, and monocular information is used to recognize based on psychological and empirical information. The lens device 30 can cause the viewer to recognize the distance by monocular information by generating the virtual image 40 at a position 3 m or more away from the viewpoint. For example, when the parallax image is not displayed. However, an image with a sense of depth can be provided.

  In addition, when a human sees an object at a position farther than an object 1 m or more away, it is said that such a factor of distance recognition based on monocular information is superior to a factor of binocular parallax. Therefore, the lens device 30 can also make the viewer recognize the distance by monocular information even by generating the virtual image 40 at a position 1 m or more away from the viewpoint, and provide an image with an increased sense of depth. can do.

  Moreover, the width | variety of the horizontal direction (horizontal direction with respect to the display panel 20) of the plane lens 50 is 120 mm or more as an example. The distance between the viewpoint and the flat lens 50 is preferably 100 mm or more in terms of psychology. When the distance between the viewpoint and the flat lens 50 is 100 mm and the distance between the pupils of the viewer is 65 mm, in order to secure a viewing angle (view angle) of 30 °, the side of the flat lens 50 The width in the direction needs to be 120 mm or more. Therefore, it is preferable that the horizontal width of the flat lens 50 is 120 mm or more.

  The display panel 20 has a size of 15 inches or more. For example, when a moving image is viewed on a display installed indoors or the like, the minimum display size is about 15 inches. Therefore, the display panel 20 is preferably 15 inches or more.

  As described above, according to the display system 10, it is possible to provide a highly realistic image. Furthermore, since the display system 10 can be realized by adding the lens device 30 to an existing system, a high presence can be obtained by a simple and inexpensive method.

  FIG. 2 shows an example of the display system 10 according to the present embodiment that provides images to a plurality of viewers. The present embodiment may be configured such that a plurality of viewers see one display panel 20. In this case, the lens device 30 is individually provided for each of at least one viewer. For example, when a large number of viewers view one large display panel 20 in a theater or the like, the lens device 30 may be provided for each seat. The viewer can also remove the lens device 30 and view the image. As a result, the display system 10 can provide a normal image to a viewer who does not wish to view the image in an enlarged manner.

  FIG. 3 shows an arrangement example of the display panel 20, the virtual image 40, and the flat lens 50 according to the present embodiment.

  Consider that the display panel 20 and the planar lens 50 are arranged so that the viewing angle (viewing angle) of the virtual image 40 is 30 ° when the display panel 20 is viewed from a standard viewing distance. In this case, if the lateral width of the planar lens 50 is 400 mm or less, the distance c from the viewpoint to the planar lens 50 must be 750 mm or less as shown in the following formula (1).

  c = (400 mm / 2) / {tan (30 ° / 2)} ≈750 mm (1)

  As described above, when the viewing angle (view angle) of the virtual image 40 is set to 30 °, the image can be viewed simultaneously by, for example, a large number of people using the relatively large display panel 20. In this case, it is preferable that the lens device 30 generates a virtual image 40 having a size 1.5 times or more that of the display panel 20 with an enlargement ratio of 1.5 times or more for the purpose of giving a sense of presence of a certain degree or more. . In this case, the lens device 30 can generate a virtual image 40 having a size 1.5 times or more that of the display panel 20. In this case, the planar lens 50 is disposed at a distance of 750 mm or less from the viewpoint.

  Further, the magnification ratio M of the lens device 30 is expressed by the following formula (2). In Expression (2), f represents the focal length, a represents the distance from the lens device 30 to the display panel 20, and b represents the distance from the lens device 30 to the virtual image 40. As shown in the following formula (2), when the enlargement ratio M is set to a predetermined value (for example, 1.5 times) or more, the lens device 30 has an upper limit of the focal length f based on the distance a. Limited by value.

  M = b / a = f / (fa) (2)

  For example, it is assumed that the display panel 20 is 50 inches in size, the distance c from the viewpoint to the flat lens 50 is 300 mm, and the distance a from the flat lens 50 to the display panel 20 is 1500 mm. Further, it is assumed that the focal length f of the flat lens 50 is 2000 mm. In this case, the viewer can see a virtual image 40 of a 200-inch display 6.3 m away from the viewpoint. Further, the viewing angle of the virtual image 40 at this time is about 37 °. In this way, the display system 10 can provide a highly realistic image with a wide viewing angle.

  Further, it is considered that the display panel 20 and the planar lens 50 are arranged so that the viewing angle (viewing angle) of the virtual image 40 is 80 ° when the display panel 20 is viewed from a standard viewing distance. In this case, if the horizontal width of the planar lens 50 is 400 mm or less, the distance c from the viewpoint to the planar lens 50 must be 240 mm or less as shown in the following formula (3).

  c = (400 mm / 2) / {tan (80 ° / 2)} ≈240 mm (3)

  Thus, when the viewing angle (viewing angle) of the virtual image 40 is set to 80 °, simultaneous viewing by a large number of people is difficult, but since the viewing angle can be greatly increased, the sense of reality can be increased. In this case, the planar lens 50 is disposed at a distance of 240 mm or less from the viewpoint.

  For example, it is assumed that the display panel 20 is 50 inches in size, the distance c from the viewpoint to the flat lens 50 is 200 mm, and the distance a from the flat lens 50 to the display panel 20 is 1600 mm. Further, it is assumed that the focal length f of the flat lens 50 is 650 mm. In this case, the viewer can see the virtual image 40 of the 215-inch size display 2.4 m away from the viewpoint. Further, the viewing angle of the virtual image 40 at this time is about 88 °. In this way, the display system 10 can provide a highly realistic image with a wide viewing angle.

  FIG. 4 shows an example of a cross-sectional structure of the planar lens 50 according to this embodiment. The planar lens 50 includes a Fresnel lens 60, a transparent plate 62, a transparent adhesive layer 64, a lens side antireflection film 66, and a substrate side antireflection film 68.

  The Fresnel lens 60 has a lens groove formed on one surface (lens surface), and the other surface is flat. The Fresnel lens 60 is a convex lens. As an example, the Fresnel lens 60 has a lens groove interval of 0.4 mm or more. As a result, the Fresnel lens 60 can be viewed without dropping the resolution due to diffraction effects.

  The transparent plate 62 is a thin plate having substantially the same size as the Fresnel lens 60 and is bonded to the lens surface of the Fresnel lens 60. The transparent plate 62 is an acrylic plate as an example. The transparent plate 62 has a flat surface on the Fresnel lens 60 side.

  The Fresnel lens 60 and the transparent plate 62 are bonded with a transparent adhesive. A space between the lens surface of the Fresnel lens 60 and the surface of the transparent plate 62 on the Fresnel lens 60 side is filled with a transparent adhesive, and a transparent adhesive layer 64 is formed.

  The transparent adhesive layer 64 has a refractive index lower than that of the Fresnel lens 60. For example, the refractive index of the Fresnel lens 60 and the transparent plate 62 is n = 1.49, and the refractive index of the transparent adhesive layer 64 is n = 1.41. Thereby, the planar lens 50 can form a convex lens having a long focal length.

  The lens-side antireflection film 66 is formed by applying an antireflection coating on a flat surface opposite to the surface (lens surface) to which the transparent plate 62 of the Fresnel lens 60 is bonded. The substrate-side antireflection film 68 is formed by applying an antireflection coating on the surface of the transparent plate 62 opposite to the surface to which the Fresnel lens 60 is bonded.

  The lens device 30 including such a flat lens 50 can make the image displayed by the display panel 20 clear to the viewer without making the lens groove formed in the Fresnel lens 60 inconspicuous. Further, the lens device 30 holds the flat lens 50 such that the surface of the Fresnel lens 60 on which the lens groove is provided is on the display panel 20 side. Thereby, the lens apparatus 30 can make a lens groove more inconspicuous.

  The Fresnel lens 60 may be a concave lens. In this case, the refractive index of the transparent adhesive layer 64 is made larger than the refractive index of the Fresnel lens 60 and the refractive index of the transparent plate 62. Thereby, the planar lens 50 can thereby form a convex lens having a long focal length.

  FIG. 5 shows an example of a cross-sectional shape of the Fresnel lens 60. As an example, the Fresnel lens 60 may be formed such that the angle between the vertical surface 72 of the lens groove and the curved surface 74 forming the lens surface is an acute angle as shown in FIG. Thereby, in order to form the lens groove of such a Fresnel lens 60, the angle between the vertical surface 72 and the curved surface 74 in the mold can be made an obtuse angle, so that the mold can be easily formed.

  FIG. 6 shows an appearance and a functional configuration of a lens apparatus 30 according to a modification. Since the lens device 30 according to this modification adopts substantially the same configuration and function as the lens device 30 described with reference to FIGS. 1 to 5, members having substantially the same configuration and function are denoted by the same reference numerals, The description is omitted below except for the differences.

  The lens device 30 according to this modification further includes a detection unit 82, an outer frame adjustment unit 84, and a lens position adjustment unit 86. In the present modification, the lens device 30 is configured such that the range covering the flat lens 50 by the outer frame portion 52 can be changed. In the lens device 30, as an example, at least one of a height at which the outer frame portion 52 covers the upper side portion, a height at which the outer side portion covers the lower side portion, a width at which the right side portion is covered, and a width at which the left side portion is covered can be changed. ing.

  In the present modification, the lens device 30 can change the distance to the display panel 20 in the flat lens 50. For example, the support unit 54 of the lens device 30 can move the planar lens 50 in a direction perpendicular to the plane.

  The detection unit 82 detects the distance to the display panel 20 of the lens device 30 and the distance to the viewpoint. For example, the detection unit 82 measures the distance using a sensor or the like. The detection unit 82 may detect the distance by acquiring information input by the viewer.

  The outer frame adjustment unit 84 adjusts at least one of the height and width of the portion of the flat lens 50 that is within the frame of the outer frame unit 52 based on the distance to the display panel 20 and the distance to the viewpoint. The outer frame adjusting unit 84 adjusts at least one of the height and width of the portion of the outer frame 52 that moves within the frame by moving the plate-like member up and down or left and right by an actuator or the like.

  Accordingly, the outer frame adjustment unit 84 can make the range that the viewer can see from within the frame of the outer frame unit 52 substantially match the range of the display surface of the display panel 20. Therefore, the lens device 30 can reliably eliminate the unnaturalness of the peripheral portion when viewing the display panel 20 enlarged by the flat lens 50.

  The lens position adjustment unit 86 adjusts the position of the planar lens 50 based on at least one of the distance to the display panel 20 and the distance to the viewpoint detected by the detection unit 82. Thereby, the lens position adjustment unit 86 can move the flat lens 50 to a position where the viewer can view the virtual image 40 obtained by enlarging the display panel 20.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that the output can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first”, “next”, etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

DESCRIPTION OF SYMBOLS 10 Display system, 20 Display panel, 30 Lens apparatus, 32 Chair, 34 Table, 40 Virtual image, 50 Plane lens, 52 Outer frame part, 54 Support part, 60 Fresnel lens, 62 Transparent board, 64 Transparent adhesive layer, 66 Lens Side antireflection film, 68 Substrate side antireflection film, 72 Vertical surface, 74 Curved surface, 82 Detection unit, 84 Outer frame adjustment unit, 86 Lens position adjustment unit

Claims (14)

A lens device for viewing a display surface of a display device,
With Fresnel lenses,
A transparent plate bonded to the lens surface of the Fresnel lens;
A lens apparatus comprising:   The lens device according to claim 1, further comprising a support portion that supports the Fresnel lens and the transparent plate in a standing state at a position away from the display device.   The lens device according to claim 1, wherein the transparent plate is an acrylic plate.   The lens device according to claim 1, wherein a surface of the transparent plate on the Fresnel lens side is flat.   The lens apparatus according to claim 4, wherein a space between the lens surface of the Fresnel lens and the surface of the transparent plate on the Fresnel lens side is filled with a transparent adhesive.   The lens apparatus according to claim 5, wherein the Fresnel lens is a convex lens, and a refractive index of the transparent adhesive is smaller than a refractive index of the Fresnel lens.   The lens apparatus according to claim 5, wherein the Fresnel lens is a concave lens, and a refractive index of the transparent adhesive is larger than a refractive index of the Fresnel lens.   The antireflection coating is applied to at least one of the surface of the Fresnel lens opposite to the transparent plate and the surface of the transparent plate opposite to the Fresnel lens. The lens device described.   The lens device according to claim 1, wherein the Fresnel lens has a lens groove interval of 0.4 mm or more.   The lens device is disposed at a position closer to the viewpoint side between the viewpoint and the display panel of the display device, and generates a virtual image obtained by enlarging the display panel at a position farther from the viewpoint than the display panel. Item 10. The lens device according to any one of Items 1 to 9.   The lens device according to claim 10, wherein the lens unit including the Fresnel lens and the transparent plate generates the virtual image in which a viewing angle of the virtual image with respect to the viewpoint is larger than a viewing angle of the display panel with respect to the viewpoint.   The lens device according to claim 10 or 11, wherein a lens unit including the Fresnel lens and the transparent plate generates a virtual image 1.5 times or more that of the display panel.   The lens device according to any one of claims 1 to 12, wherein a lens portion formed by the Fresnel lens and the transparent plate has a width corresponding to a horizontal direction of a display surface of the display device of 120 mm or more. A display device for displaying an image;
A lens device according to any one of claims 1 to 13;
A display system comprising:

Images