JP2004294817A - Three-dimensional display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-dimensional display, in which a great number of persons can observe a three-dimensional image at the same time by suppressing contradiction between physiological factors of a three-dimensional view. <P>SOLUTION: The three-dimensional display comprises a display unit, two partial lenses provided in front of both the eyes of an observer and composing part of one variable focus lens, a drive device for changing a focal distance of a variable-focal lens composing part by the two partial lenses into n-stages, when (n) is set to an integer of 2 or greater, and a synchronous device for displaying a two-dimensional image photographing a display object from the line of sight direction of the observer on the display unit for an n-th display face in n-display faces at a depth position which is different as seen from the observers, by synchronizing the two partial lenses with n-stage change of the focal distance of the variable focus lens composing a part. The synchronizer device independently causes to change the brightness of the two-dimensional image displayed on the display unit for each n-pieces of two-dimensional images, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a three-dimensional display device, and more particularly to a three-dimensional display device that suppresses inconsistency between physiological factors of stereoscopic vision and allows a large number of people to simultaneously observe a three-dimensional stereoscopic image.
[0002]
[Prior art]
The present inventors have proposed a three-dimensional display device capable of suppressing inconsistency between physiological factors of stereoscopic vision and displaying a three-dimensional stereoscopic image of a color image without using glasses (for example, See patent literature.).
[0003]
Prior art document information related to the invention of the present application includes the following.
[Patent Document]
Japanese Patent No. 3022558 [Non-Patent Document]
"Liquid Crystal / Basic", "Liquid Crystal / Application" (Okano and Kobayashi, edited by Baifukan)
[0004]
FIG. 8 is a diagram showing a schematic configuration of a three-dimensional display device which is a basis of the present invention, which is the three-dimensional display device shown in FIG. 1 in the above-mentioned patent document.
In the three-dimensional display device shown in the figure, a plurality of display surfaces, for example, display surfaces (101, 102) (the display surface 101 is closer to the observer 100 than the display surface 102) are set in front of the observer 100. An optical system 103 is constructed using a two-dimensional display device and various optical elements in order to display a plurality of two-dimensional images on the display surfaces (101, 102).
Hereinafter, the display principle of the three-dimensional display device which is the basis of the present invention will be described with reference to FIGS.
As shown in FIG. 9, an image obtained by projecting a three-dimensional object 104 to be presented to the observer 100 from the viewing directions of both eyes of the observer 100 onto the above-described display surfaces (101, 102) (hereinafter, “2D image”) (105, 106).
As a method of generating the 2D image, for example, a method using a two-dimensional image of the object 104 captured by a camera from the line of sight, a method of synthesizing a plurality of two-dimensional images captured from another direction, or a computer graphic There are various methods such as a method using a synthesis technique and a modeling method.
[0005]
Then, as shown in FIG. 8, the 2D images (105, 106) are viewed from one point on a line connecting the right eye and the left eye of the observer 100 on both the display surface 101 and the display surface 102, respectively. Display so that they overlap.
This can be achieved, for example, by controlling the arrangement of the center position and the position of the center of gravity of the 2D images (105, 106) and the enlargement / reduction of each image.
An important point of the three-dimensional display device that is the basis of the present invention is that the brightness of each of the 2D images (105, 106) is kept constant on the device having the above-described configuration while the overall brightness viewed from the observer 100 is constant. While changing the depth corresponding to the depth position of the three-dimensional object 104.
An example of the change is described below. In this case, since the drawing is a black and white drawing, the one having higher luminance is shown darker in the following drawings for easy understanding.
For example, when the three-dimensional object 104 is on the display surface 101, as shown in FIG. 10, the luminance of the 2D image 105 on the three-dimensional object 104 is made equal to the luminance of the three-dimensional object 104, The luminance of the chemical image 106 is set to zero.
[0006]
Next, for example, when the three-dimensional object 104 is located slightly away from the observer 100 and slightly closer to the display surface 102 side than the display surface 101, as shown in FIG. The brightness is slightly lowered and the brightness of the 2D image 106 is raised slightly.
Further, for example, when the three-dimensional object 104 is further away from the observer 100 and further closer to the display surface 102 side than the display surface 101, the luminance of the 2D image 105 is further increased as shown in FIG. The brightness of the 2D image 106 is further increased.
Finally, for example, when the three-dimensional object 104 is on the display surface 102, the luminance of the 2D image 106 on the three-dimensional object 104 is made equal to the luminance of the three-dimensional object 104, as shown in FIG. Of the 2D image 105 is zero.
By displaying in this manner, the observer (person) 100 may be displayed as if it were a 2D image (105, 106) due to physiological or psychological factors or an illusion. It is felt that the three-dimensional object 104 is located between the display surfaces (101, 102).
That is, for example, when the 2D images (105, 106) of substantially equal luminance are displayed on the display surface (101, 102), the three-dimensional object 104 is located near the middle of the depth position of the display surface (101, 102). It feels like it is.
[0007]
[Problems to be solved by the invention]
As described above, in the three-dimensional display device described in the above-described patent document, the 2D images (105, 106) are respectively overlapped so as to overlap when viewed from one point on a line connecting the right eye and the left eye of the observer 100. It is necessary to display on both the display surface 101 and the display surface 102.
Therefore, in the three-dimensional display device described in the above-mentioned patent document, the position where the three-dimensional stereoscopic image is observed is limited, and a problem that a large number of persons cannot observe the three-dimensional stereoscopic image at the same time. There was a point.
The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to suppress inconsistency between physiological factors of stereoscopic vision, and to allow a large number of people to simultaneously perform tertiary vision. An object of the present invention is to provide a three-dimensional display device capable of observing an original three-dimensional image.
The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.
[0008]
[Means for Solving the Problems]
The following is a brief description of an outline of typical inventions disclosed in the present application.
That is, the present invention provides a display device, two partial lenses provided in front of both eyes of an observer, each constituting a part of one varifocal lens, and n is an integer of 2 or more. A driving device for changing the focal length of a variable focus lens of which two partial lenses form a part to n stages, and synchronizing with the change of the focal length of a variable focus lens of the two partial lenses for a part of n stages Then, a two-dimensional image of the display target object projected from the line of sight of the observer on the n-th display surface among the n display surfaces at different depth positions as viewed from the observer, What is claimed is: 1. A three-dimensional display device comprising: a synchronization device for displaying on a display device, wherein the synchronization device independently changes the brightness of a two-dimensional image displayed on the display device for each of n two-dimensional images.
Further, in the present invention, the driving device changes the focal length of the varifocal lens in which the two partial lenses form a part in n stages in a time division manner.
In the present invention, the varifocal lens in which the two partial lenses form a part is a bifocal lens capable of switching the focal length between two fixed focal lengths (for example, a bifocal lens using a dual-frequency liquid crystal). Lens).
[0009]
In addition, the present invention is provided on a display device and an observer side of the display device, and switches a polarization direction of a two-dimensional image incident from the display device to a first polarization direction and a second polarization direction. A polarization switching device, two partial lenses provided in front of both eyes of the observer, each constituting a part of one polarization bifocal lens, and two-dimensional light incident from the display device in the polarization switching device When the polarization direction of the image was switched to the first polarization direction, the display target object was projected from the line of sight of the observer on two display surfaces at different depth positions as viewed from the observer. When one of the two-dimensional images is displayed on the display device, or when the polarization switching device switches the polarization direction of the two-dimensional image incident from the display device to the second polarization direction. The above observation Drive device for displaying, on the display device, the other two-dimensional image of the two-dimensional images projected from the line of sight of the observer on the two display surfaces at different depth positions as viewed from A three-dimensional display device comprising: a driving unit that changes the luminance of a two-dimensional image displayed on the display device independently for each of the two two-dimensional images.
[0010]
Further, the present invention provides a display device, provided on the observer side of the display device, wherein a polarization direction of a two-dimensional image incident from the display device is set between a first polarization direction and a second polarization direction. A variable polarization device that can be switched to an arbitrary polarization direction, two partial lenses provided in front of both eyes of the observer, each constituting a part of one polarization bifocal lens, and the polarization variable device. A three-dimensional display device comprising a driving device for controlling, the polarization changing device displays a polarization direction of a two-dimensional image incident from the display device on the display device under the control of the driving device. The switching is performed according to the depth position of the two-dimensional image to be viewed from the observer.
Further, in the present invention, the spectacles are provided with glasses worn by the observer, and the glasses have the two partial lenses as left and right lenses.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In all the drawings for describing the embodiments, components having the same function are denoted by the same reference numerals, and repeated description thereof will be omitted.
[Embodiment 1]
FIG. 1 is a diagram illustrating a schematic configuration of the three-dimensional display device according to the first embodiment of the present invention.
As shown in the figure, the three-dimensional display device according to the present embodiment includes a large-screen display device (hereinafter, simply referred to as a display device) 200 and a partial lens (131) disposed in front of both eyes of the observer 100. , 132), a driving device 210, and a synchronization device 220.
Here, the partial lenses (131, 132) constitute a part of the varifocal lens 130. The partial lenses (131, 132) are attached, for example, as left and right lenses of the glasses, as shown in FIG. 1, and the observer 100 observes the display device 200 with the glasses.
As the display device 200, for example, a CRT, a liquid crystal display, an LED display, an EL display, a plasma display, an FED display, a projection display, a line drawing display, or the like is used.
Further, when n is an integer of 2 or more (n ≧ 2), the varifocal lens 130 can change the focal length in n stages. In the following description, the case where n is 2 will be described. .
[0012]
As shown in FIG. 2, in the present embodiment, the driving device 210 changes the focal length of the varifocal lens 130 of which two partial lenses (131, 132) form a part in two stages in a time-division manner. The two-dimensional image displayed on the display device 200 is formed on the imaging plane 1021 and the imaging plane 1022.
When the two-dimensional image displayed on the display device 200 is formed on the image forming surface 1021 by the synchronization device 220, the 2D image 105 described with reference to FIG. 9 is displayed on the display device 200, and When the two-dimensional image displayed on the display device 200 is formed on the imaging surface 1022, the display device 200 displays the 2D image 106 described with reference to FIG. The luminance of 106) is changed as described with reference to FIGS.
By performing this operation within the afterimage time of the human eye, the three-dimensional display device of the present embodiment becomes optically equivalent to the three-dimensional display device shown in FIG.
In FIG. 3, reference numeral 111 denotes a display surface formed of a two-dimensional image formed on the image forming surface 1021, and reference numeral 112 denotes a display surface formed of a two-dimensional image formed on the image forming surface 1022.
Therefore, the three-dimensional display device of the present embodiment can display a three-dimensional stereoscopic image based on the above-described display principle of the three-dimensional display device that is the basis of the present invention.
[0013]
In the three-dimensional display device of the present embodiment, two partial lenses (131, 132) constituting a part of the variable focus lens 130 are arranged in front of the observer 100, that is, for each observer. Since the varifocal lens 130 is arranged, a large number of persons can observe a three-dimensional stereoscopic image at the same time.
In addition, in the three-dimensional display device of the present embodiment, since there are at least two or more surfaces that actually display an image with the illusion position therebetween, the binocular parallax, the convergence, and the focus adjustment The contradiction can be largely suppressed, eye strain can be suppressed, and the observed image itself moves in the depth direction, so that it is easy to satisfy the factors of stereoscopic vision.
In the above description, the case where the focal length of the varifocal lens 130 in which the two partial lenses (131, 132) form a part has been changed in two stages has been described, but the two partial lenses (131, 132) have been described. It is also possible to change the focal length of the varifocal lens 130 which forms a part in two or more n stages.
In this case, the n partial lenses (131, 132) are synchronized with the n-stage change in the focal length of the varifocal lens 130 forming a part thereof, and the n partial lenses (131, 132) at different depth positions as viewed from the observer. The display device 200 displays a two-dimensional image obtained by projecting the display target object from the line of sight of the observer on the n-th display surface among the display surfaces.
[0014]
[Embodiment 2]
FIG. 4 is a diagram illustrating a schematic configuration of the three-dimensional display device according to the second embodiment of the present invention.
As shown in the figure, the three-dimensional display device of the present embodiment is arranged between a large-screen display device (hereinafter, simply referred to as a display device) 200 and the display device 200 and an observer. Polarization switching device 150 for switching the polarization direction of a two-dimensional image incident from the camera to a first polarization direction and a second polarization direction, and partial lenses (131, 132) arranged in front of both eyes of the observer 100 ) And a synchronizer 220.
Here, the partial lenses (131, 132) constitute a part of the polarizing bifocal lens 135. The partial lenses (131, 132) are attached as left and right lenses of the glasses, for example, as shown in FIG. 4, and the observer 100 observes the display device 200 with the glasses.
As in the above-described embodiment, as the display device 200, for example, a CRT, a liquid crystal display, an LED display, an EL display, a plasma display, an FED display, a projection display, a line drawing display, or the like is used.
[0015]
The polarization type bifocal lens 135 in which the two partial lenses (131, 132) form a part has a configuration in which the incident light has the first polarization direction and the configuration in which the incident light has the second polarization direction. Are lenses having different focal lengths.
In the present embodiment, the polarization switching device 150 switches the polarization direction of the two-dimensional image output from the polarization switching device 150 between the first polarization direction and the second polarization direction in a time-division manner.
Thus, in the present embodiment, the two-dimensional image displayed on the display device 200 can be formed on the imaging plane 1021 and the imaging plane 1022 by time division as shown in FIG.
When the two-dimensional image displayed on the display device 200 is formed on the image forming surface 1021 by the synchronization device 220, the 2D image 105 described with reference to FIG. 9 is displayed on the display device 200, and When the two-dimensional image displayed on the display device 200 is formed on the imaging surface 1022, the display device 200 displays the 2D image 106 described with reference to FIG. The luminance of 106) is changed as described with reference to FIGS.
By performing this operation within the afterimage time of the human eye, the three-dimensional display device of the present embodiment becomes optically equivalent to the three-dimensional display device shown in FIG.
Therefore, the three-dimensional display device of the present embodiment can display a three-dimensional stereoscopic image based on the above-described display principle of the three-dimensional display device that is the basis of the present invention.
[0016]
In FIG. 4, the polarization switching device 150 is disposed immediately before the partial lenses (131, 132). However, the polarization switching device 150 may be disposed on the display device 200. On the lens (131, 132), it may be arranged integrally with the partial lens (131, 132).
As described above, also in the three-dimensional display device of the present embodiment, the partial lenses (131, 132) constituting a part of the polarizing bifocal lens 135 are arranged in front of the observer 100, that is, Since the polarizing bifocal lens 135 is arranged for each observer, a large number of persons can observe a three-dimensional stereoscopic image at the same time.
In addition, in the three-dimensional display device of the present embodiment, since there are at least two or more surfaces that actually display an image with the illusion position therebetween, the binocular parallax, the convergence, and the focus adjustment The contradiction can be largely suppressed, eye strain can be suppressed, and the observed image itself moves in the depth direction, so that it is easy to satisfy the factors of stereoscopic vision.
[0017]
[Embodiment 3]
FIG. 5 is a diagram illustrating a schematic configuration of a three-dimensional display device according to Embodiment 3 of the present invention.
As shown in the figure, the three-dimensional display device of the present embodiment is arranged between a large-screen display device (hereinafter, simply referred to as a display device) 200 and the display device 200 and an observer. A polarization variable device 151 that can switch the polarization direction of the two-dimensional image incident from the first polarization direction and the second polarization direction to an arbitrary polarization direction, and the front of both eyes of the observer 100. It includes a partial lens (131, 132) to be arranged and a synchronizer 220.
Here, the partial lenses (131, 132) constitute a part of the polarizing bifocal lens 135. The partial lenses (131, 132) are attached as left and right lenses of the glasses, for example, as shown in FIG. 5, and the observer 100 observes the display device 200 with the glasses.
As in the above-described embodiment, as the display device 200, for example, a CRT, a liquid crystal display, an LED display, an EL display, a plasma display, an FED display, a projection display, a line drawing display, or the like is used.
[0018]
The polarization type bifocal lens 135 in which the two partial lenses (131, 132) form a part has a configuration in which the incident light has the first polarization direction and the configuration in which the incident light has the second polarization direction. Are lenses having different focal lengths.
For example, as shown in FIG. 6, when the polarization direction of the two-dimensional image emitted from the polarization changing device 151 is the direction of A, the polarization bifocal lens 135 has the first p1 shown in FIG. Is equivalent to the case where the two-dimensional image of the second polarization direction of p2 shown in FIG. 6 is incident.
Therefore, when the polarization direction of the two-dimensional image emitted from the polarization variable device 151 is the direction A shown in FIG. 6, the two-dimensional image emitted from the polarization variable device 151 For example, an image is formed on an image plane 1021 and an image plane 1022 as shown in FIG.
In this case, the brightness of the two-dimensional image formed on the imaging planes 1021 and 1022 as shown in FIG. And the second polarization direction (variable θ shown in FIG. 6).
[0019]
That is, in the present embodiment, the polarization changing device 151 is controlled by the synchronization device 220, and the polarization direction of the two-dimensional image output from the polarization changing device 151 is changed by the observer 100 of the two-dimensional image displayed on the display device 200. By switching in accordance with the depth position viewed from above, the luminance of the two-dimensional image formed on the imaging plane 1021 and the imaging plane 1022 as shown in FIG. Can be changed.
Therefore, also in the three-dimensional display device of the present embodiment, it is possible to display a three-dimensional stereoscopic image based on the above-described display principle of the three-dimensional display device which is the basis of the present invention.
Note that by using a device using liquid crystal as the polarization changing device 151, it is possible to change the polarization direction of light for each pixel.
As described above, also in the three-dimensional display device of the present embodiment, the partial lenses (131, 132) constituting a part of the polarizing bifocal lens 135 are arranged in front of the observer 100, that is, Since the polarizing bifocal lens 135 is arranged for each observer, a large number of persons can observe a three-dimensional stereoscopic image at the same time.
In addition, in the three-dimensional display device of the present embodiment, since there are at least two or more surfaces that actually display an image with the illusion position therebetween, the binocular parallax, the convergence, and the focus adjustment The contradiction can be largely suppressed, eye strain can be suppressed, and the observed image itself moves in the depth direction, so that it is easy to satisfy the factors of stereoscopic vision.
[0020]
FIG. 7 is a diagram illustrating a schematic configuration of an example of a polarization type bifocal lens 135 in which two partial lenses (131, 132) form a part according to Embodiments 2 and 3 of the present invention.
As shown in FIGS. 7A and 7B, the polarization type bifocal lens 135 shown in FIG. 7 includes a fixed focus lens 301 and a birefringent region 302.
Here, the fixed focus lens 301 is, for example, a convex lens made of glass or plastic shown in FIG. 7B, a concave lens made of glass or plastic shown in FIG. It is composed of a lens system formed by a combination of a concave lens and a prism, or a mirror system formed by a combination of a convex lens, a concave lens, and a prism made of glass or plastic.
The birefringent region 302 is made of, for example, a medium having biregion refraction, such as a liquid crystal or PLZT.
[0021]
Here, the refractive index of the fixed focus lens 301 is n1, and the refractive indices of the birefringent region 302 in the first polarization direction and the second polarization direction of the incident light are n21 and n22, respectively.
For example, when light is incident from the birefringent region 302, the light travels while feeling the refractive indexes n21 and n22 in accordance with the polarization direction of the incident light, and then comes into contact with the fixed focus lens 301 having the refractive index n1.
Therefore, the outgoing light forms an image at different positions according to the polarization state of the incident light. That is, it operates as a bifocal lens 135 having a different focal length depending on the polarization direction.
Conversely, when the light is incident from the fixed focus lens 301 side, the light is similarly separated and formed on two image forming planes by the refractive index according to the intrinsic polarization direction.
Note that, as shown in FIG. 7, when the birefringent region 302 is a liquid crystal, by adding the alignment film 303, it is possible to obtain in-plane uniform separation with respect to light incident from the birefringent region 302 side.
[0022]
Also, in the polarization type bifocal lens 135 shown in FIG. 7, even when the fixed focus lens 301 is not provided, one or both surfaces of the birefringent region 302 have a lens shape or a prism shape as shown in FIG. Has a similar effect.
Further, as a medium having birefringence, liquid crystal is useful because of its large refractive index anisotropy. Examples of the type of the liquid crystal include not only ordinary nematic liquid crystals but also polymer dispersed liquid crystals and holographic polymer dispersed liquid crystals. Liquid crystal, polymer liquid crystal, smectic liquid crystal, ferroelectric liquid crystal, polymer stabilized ferroelectric liquid crystal, and the like.
Further, it is clear that birefringence can be obtained by forming a polymer material other than liquid crystal with the main axes aligned.
As the polarization switching device 150 of the second embodiment or the polarization changing device 151 of the third embodiment, for example, a medium (for example, a liquid crystal or PLZT) that can change birefringence by an electric field or a voltage is used. The equipment used is well known. Many types of devices using liquid crystal are described in, for example, "Liquid Crystal and Basic Edition" and "Liquid Crystal and Application Edition" (Okano and Kobayashi, edited by Baifukan).
[0023]
In the present embodiment, as a method of arranging two partial lenses (131, 132) constituting a part of the varifocal lens 130 (or the polarizing bifocal lens 135) in front of the observer 100, Eyeglasses were prepared in which two partial lenses (131, 132) were attached as left and right lenses, and the observer 100 adopted a method of wearing these glasses. The method of arranging in front of 100 eyes is not limited to this, and other methods may be used.
Further, in the above description, for example, the depth position of the entire three-dimensional object is set to the focal length of the variable focus lens 130 (or the polarizing bifocal lens 135) of which two partial lenses (131, 132) form a part. The 2D image displayed on the display device 200 is formed on the image forming surface 1021 and the image forming surface 1022 by changing the polarization direction in the polarization changing device 151 by changing the polarization direction in two stages by time division. Although the method and the device for expressing the three-dimensional object have been mainly described, the three-dimensional display device of the present embodiment may also be used as a method and a device for expressing the depth of the three-dimensional object itself, as described in the above-mentioned patent document. Can be used.
[0024]
Similarly, the three-dimensional display device of the present embodiment can be used even when the three-dimensional object itself moves as described in the above-mentioned patent document.
When the 2D image moves three-dimensionally, the movement in the left / right and up / down directions can be performed by moving image reproduction in the display device as in the case of a normal two-dimensional display device. As described in the above-mentioned patent document, the focal length of the variable focus lens 130 (or the polarizing bifocal lens 135) of which two partial lenses (131, 132) form a part is divided into two stages by time division. When the 2D image displayed on the display device 200 is formed on the image forming surfaces 1021 and 1022 by changing the polarization direction in the polarization changing device 151, By temporally changing the luminance of the 2D image displayed on 200, a moving image of a three-dimensional image can be expressed.
As described above, the invention made by the inventor has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and can be variously modified without departing from the gist of the invention. Needless to say,
[0025]
【The invention's effect】
The following is a brief description of an effect obtained by a representative one of the inventions disclosed in the present application.
ADVANTAGE OF THE INVENTION According to the three-dimensional display apparatus of this invention, the contradiction between the physiological factors of a stereoscopic vision is suppressed, and it becomes possible for many persons to observe a three-dimensional stereoscopic image simultaneously.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a schematic configuration of a three-dimensional display device according to a first embodiment of the present invention.
FIG. 2 is a diagram for explaining an operation of the three-dimensional display device according to the first embodiment of the present invention.
FIG. 3 is a diagram illustrating a three-dimensional display device that is optically equivalent to the three-dimensional display device according to the first embodiment of the present invention.
FIG. 4 is a diagram illustrating a schematic configuration of a three-dimensional display device according to a second embodiment of the present invention.
FIG. 5 is a diagram illustrating a schematic configuration of a three-dimensional display device according to a third embodiment of the present invention.
FIG. 6 is a diagram for explaining an operation according to the second embodiment of the present invention.
FIG. 7 is a diagram illustrating a schematic configuration of an example of a polarization type bifocal lens in which two partial lenses form a part in the three-dimensional display devices according to Embodiments 2 and 3 of the present invention.
FIG. 8 is a diagram showing a schematic configuration of a three-dimensional display device that is a basis of the present invention.
FIG. 9 is a diagram for explaining a method of generating a 2D image to be displayed on each display surface in the three-dimensional display device which is the basis of the present invention.
FIG. 10 is a diagram for explaining a display principle of a conventional three-dimensional display device.
FIG. 11 is a diagram for explaining a display principle of a three-dimensional display device which is a basis of the present invention.
FIG. 12 is a diagram for explaining a display principle of a three-dimensional display device that is a basis of the present invention.
FIG. 13 is a diagram for explaining the display principle of the three-dimensional display device that is the basis of the present invention.
[Explanation of symbols]
100: observer, 101, 102, 111, 112: display surface, 103: optical system, 104: three-dimensional object, 105, 106: 2D image, 130: variable focus lens, 131, 132: partial lens, 135 ... Polarization type bifocal lens, 150: polarization switching device, 151: polarization changing device, 200: large screen display device, 210: drive device, 220: synchronization device, 301: fixed focus lens, 302: birefringent region, 303: orientation Film, 1021, 1022...

Claims (7)

A display device;
Two partial lenses which are provided in front of both eyes of the observer and respectively constitute a part of one variable focus lens;
When n is an integer of 2 or more, a driving device that changes the focal length of the varifocal lens in which the two partial lenses form a part in n stages,
In synchronism with an n-stage change in the focal length of the varifocal lens in which the two partial lenses form a part, an n-th display surface among n display surfaces at different depth positions as viewed from the observer. For a surface, a two-dimensional image projected from the line of sight of the observer from the display target object, a synchronous device for displaying on the display device, a three-dimensional display device,
The three-dimensional display device, wherein the synchronization device independently changes the luminance of the two-dimensional image displayed on the display device for every n two-dimensional images. The three-dimensional display device according to claim 1, wherein the driving device changes the focal length of the variable focus lens in which the two partial lenses form a part in n stages in a time division manner. 3. The variable focus lens of which two partial lenses form a part is a bifocal lens capable of switching a focal length between two fixed focal lengths. 4. 3D display device. The three-dimensional display device according to claim 3, wherein the bifocal lens is a bifocal lens using a bi-frequency liquid crystal. A display device;
A polarization switching device that is provided on the viewer side of the display device and switches a polarization direction of a two-dimensional image incident from the display device to a first polarization direction and a second polarization direction,
Two partial lenses which are provided in front of both eyes of the observer and each constitute a part of one polarizing bifocal lens,
When the polarization direction of the two-dimensional image incident from the display device is switched to the first polarization direction in the polarization switching device, two polarization planes at different depth positions viewed from the observer are displayed. One of the two-dimensional images projected from the line of sight of the observer on the display target object is displayed on the display device, or the two-dimensional image incident on the polarization switching device from the display device When the polarization direction is switched to the second polarization direction, the display object is projected from the line of sight of the observer onto two display surfaces at different depth positions as viewed from the observer. A driving device for displaying the other two-dimensional image in the two-dimensional image on the display device, a three-dimensional display device,
The three-dimensional display device, wherein the driving unit changes the brightness of the two-dimensional image displayed on the display device independently for each of the two two-dimensional images. A display device;
Polarized light that is provided on the viewer side of the display device and that can switch a polarization direction of a two-dimensional image incident from the display device to an arbitrary polarization direction between a first polarization direction and a second polarization direction. A variable device;
Two partial lenses which are provided in front of both eyes of the observer and each constitute a part of one polarizing bifocal lens,
A three-dimensional display device comprising a driving device that controls the polarization variable device,
The polarization changing device, under the control of the driving device, the polarization direction of the two-dimensional image incident from the display device, the depth position viewed from the observer of the two-dimensional image displayed on the display device A three-dimensional display device characterized by switching according to the condition. Comprising eyeglasses worn by the observer,
7. The three-dimensional display device according to claim 1, wherein the glasses include the two partial lenses as left and right lenses. 8.

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