Three-dimensional image display device

Abstract

To provide a three-dimensional video display device which is thinner than in prior art devices.SOLUTION: A three-dimensional video display device 1 comprises: a multiview video display unit 11 of back transmission type that displays a multiview video composed of a plurality of viewpoint videos at different positions; a point light source array unit 12 composed of a plurality of point light sources which are arranged at positions where the individual viewpoint videos of the multiview video that is displayed on the multiview video display unit 11 are irradiated from the back; and a diffusion screen 13 that displays a three-dimensional video as the multiview video displayed on the multiview video display unit 11 is irradiated from the back and spread to the front.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a three-dimensional video display device for displaying three-dimensional video.

Background Art

[0002] In recent years, various three-dimensional video display methods have been proposed, including binocular methods using 3D glasses. In particular, a three-dimensional video display method that reproduces a high-density light beam group by superimposing and irradiating a multi-viewpoint video from the back surface of a diffusion screen onto the diffusion screen does not require special glasses and can display a natural three-dimensional video having horizontal and vertical parallaxes (see Patent Documents 1 and 2). As a device for realizing this three-dimensional video display method, for example, Patent Document 1 describes a three-dimensional video display device 100 that displays a three-dimensional video T by arranging an imaging lens array 32 and an aperture array 33 composed of a plurality of imaging lenses IL between a multi-viewpoint video display unit (display device) 30 that displays a multi-viewpoint video I and a diffusion screen 31 that diffuses light irradiated from the back surface, as shown in FIG. 10. Note that the reference numerals attached other than the configurations in FIG. 10 are used for comparison with the present invention and will be described later. The three-dimensional video display device described in Patent Document 1 can display the three-dimensional video T by removing unnecessary light and enhancing the straightness of light rays using the imaging lens array and the aperture array.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional three-dimensional video display devices irradiate a multi-viewpoint video from the back onto a diffusion screen by superimposing it from a display device. Therefore, it is necessary to secure an irradiation distance of a certain length or more after arranging an imaging optical system between the display device and the diffusion screen. For this reason, conventional three-dimensional video display devices have a large depth size due to their structure, and thus there has been a demand for measures to reduce their thickness. The present invention has been made in view of such demands, and an object thereof is to provide a three-dimensional video display device that is thinner than conventional ones.

Means for Solving the Problems

[0005] To solve the above problems, a three-dimensional video display device according to the present invention is a three-dimensional video display device that displays a three-dimensional video, and is configured to include a multi-viewpoint video display unit, a point light source array unit, and a diffusion screen.

[0006] In such a configuration, the three-dimensional video display device displays a multi-viewpoint video composed of a plurality of viewpoint videos at different viewpoint positions by a back transmissive multi-viewpoint video display unit. Then, the three-dimensional video display device irradiates each viewpoint video of the multi-viewpoint video displayed on the multi-viewpoint video display unit from the back by the point light source array unit. In this point light source array unit, point light sources are arranged at positions for irradiating each viewpoint video from the back. As a result, each viewpoint video of the multi-viewpoint video is irradiated onto the diffusion screen.

[0007] Then, the three-dimensional video display device diffuses each viewpoint video of the multi-viewpoint video superimposed and irradiated on the back surface of the diffusion screen to the front while maintaining the traveling direction by the diffusion screen, and forms a group of light rays with a continuous luminance distribution to display a three-dimensional video. This point light source has a light distribution angle that irradiates the entire corresponding viewpoint video. Alternatively, each viewpoint video that constitutes a multi-viewpoint video is a video that irradiates the entire display area of the diffusion screen, and the point light sources that constitute the point light source array unit irradiate the entire corresponding viewpoint video, and the optical axes are eccentric, and the optical axes may be arranged at positions passing through the center of the diffusion screen. As a result, the three-dimensional video display device can display a three-dimensional video by irradiating each viewpoint video of the multi-viewpoint video onto the diffusion screen in a superimposed manner without using a conventional imaging optical system.

Effects of the Invention

[0008] According to the present invention, since an imaging optical system is not used, it is not necessary to secure the focal length of an imaging lens, and a three-dimensional video of the same quality as that of the conventional device can be displayed with a thinner device than the conventional one.

Brief Description of the Drawings

[0009]

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Modes for Carrying Out the Invention

[0010] <First Embodiment: Three-Dimensional Video Display Device> First, with reference to FIGS. 1 and 2, a three-dimensional video display device 1 according to the first embodiment of the present invention will be described.

[0011] The three-dimensional video display device 1 displays three-dimensional video. This three-dimensional video display device 1 displays a three-dimensional video T having parallax in the horizontal and vertical directions. As shown in FIG. 1, the three-dimensional video display device 1 mainly includes a display unit 10, and further includes a control unit 20 that controls the display unit 10. In particular, as shown in FIG. 2, the display unit 10 includes a multi-viewpoint video display unit 11, a point light source array unit 12, and a diffusion screen 13.

[0012] The multi-viewpoint video display unit 11 displays a multi-viewpoint video I composed of a plurality of viewpoint videos i at different viewpoint positions in the horizontal and vertical directions. This multi-viewpoint video display unit 11 is a transmissive display that displays a video by being backlit with light from the point light source array unit 12. The multi-viewpoint video display unit 11 can be configured by a transmissive spatial light modulator (SLM).

[0013] Note that each individual viewpoint video i displayed by the multi-viewpoint video display unit 11 is not a video that irradiates the entire display area R of the diffusion screen 13 described later, but is a video that partially irradiates the diffusion screen 13. Also, the multi-viewpoint video display unit 11 irradiates the entire display area R of the diffusion screen 13 with the individual viewpoint videos i overlapping.

[0014] In FIG. 2, the multi-viewpoint video display unit 11 is shown as a diagram that displays a plurality of viewpoint videos i in the horizontal direction (x direction), but similarly displays a plurality of viewpoint videos i in the vertical direction (y direction). That is, the multi-viewpoint video display unit 11 arranges the viewpoint videos i two-dimensionally in the horizontal and vertical directions to display the multi-viewpoint video I.

[0015] The multi-view video I displayed by this multi-view video display unit 11 is, for example, as shown in FIG. 3, a video obtained by photographing an object O with a multi-view camera MC composed of cameras C arranged in a plurality in the horizontal direction (x direction) and the vertical direction (y direction). Note that the multi-view video I is not limited to a video obtained by photographing the real space, and may be a video generated by CG or the like. In that case, the multi-view video I may be generated by virtually photographing the CG space with the camera C shown in FIG. 3 as a virtual camera.

[0016] The point light source array unit 12 is disposed on the back surface of the multi-view video display unit 11, and is a backlight that irradiates each viewpoint video i of the multi-view video I displayed by the multi-view video display unit 11 from the back surface. This point light source array unit 12 is composed of a plurality of point light sources L (point light source group). Each point light source L is a high-brightness and fine light source, and is, for example, a micro LED (LED: Light Emitting Diode), an electroluminescence (EL) light source, or the like. It is desirable that this point light source L is a minute light source having a light-emitting area equal to or smaller than the size of one pixel of the multi-view video display unit 11. In addition, the light distribution angle of the point light source L is set to an angle that can sufficiently irradiate each viewpoint video i of the multi-view video display unit 11. Each point light source L of this point light source array unit 12 is two-dimensionally arranged at a position facing the display position of each viewpoint video i of the multi-view video I displayed on the multi-view video display unit 11.

[0017] The diffusion screen 13 superimposes and irradiates each viewpoint video i of the multi-view video I displayed by the multi-view video display unit 11 from the back surface, and diffuses the light of the multi-view video I while maintaining the traveling direction. The diffusion screen 13 can be composed of a general diffuser. For example, a screen having a minute lens structure on its surface or a screen having a minute aperture array formed thereon can be used as the diffusion screen 13.

[0018] This diffusion screen 13 diffuses discrete incident light rays that are the light of the multi-view video I, and interpolates between the light rays to form a group of light rays having a continuous luminance distribution. The diffusion angle of the diffusion screen 13 is desirably the angular interval of the incident discrete light rays. This angular interval is the angular interval θ1 of the light rays connecting the adjacent point light sources L and the center P of the diffusion screen 13 C is.

[0019] Note that the angular interval θ1 is strictly different depending on the position of the point light source L. Therefore, the diffusion angle of the diffusion screen 13 may be the maximum value that the angular interval θ1 can take. Specifically, when the installation interval of the point light sources L is p1 and the distance from the point light source array unit 12 to the diffusion screen 13 is D1, the diffusion angle of the diffusion screen 13 may be the maximum value of θ1 shown in the following formula (1), max(θ1).

[0020]

Equation

[0021] The control unit 20 supplies power to the display unit 10 and outputs the multi-view video I. For example, the control unit 20 supplies power to the individual point light sources L of the point light source array unit 12 of the display unit 10 via an external power source (not shown) to cause them to emit light. Further, the control unit 20 outputs the multi-view video I input via the communication line and network to the multi-view video display unit 11 to display the multi-view video I. Note that the control unit 20 is disposed outside the region through which the light of the display unit 10 passes, for example, on the back surface of the point light source array unit 12.

[0022] As described above, the three-dimensional video display device 1 can cause the observer M to visually recognize the multi-view video I as the three-dimensional video T by using point light sources without using a conventional imaging optical system. As a result, the three-dimensional video display device 1 can reduce the depth size as compared with the conventional one.

[0023] [Operation of Three-Dimensional Video Display Device] Next, the operation of the three-dimensional video display device 1 will be described with reference to FIG. 2 (appropriately refer to FIG. 1). With the power supply turned on (illustration omitted), the control unit 20 supplies power to each point light source L of the point light source array unit 12 to cause it to emit light. Furthermore, the control unit 20 displays the multi-view video I on the multi-view video display unit 11.

[0024] The multi-view video display unit 11 irradiates the individual view videos i displayed thereon onto the diffusion screen 13 in an enlarged manner by being irradiated by the point light sources L corresponding to the view videos i from the back. Here, the multi-view video display unit 11 irradiates the diffusion screen 13 with at least two or more view videos i superimposed thereon, enabling the observer M to visually recognize videos at different viewpoint positions.

[0025] Furthermore, the diffusion screen 13 diffuses the multi-view video I irradiated from the back, diffusing the discrete light rays that are the light of the multi-view video I and interpolating between the light rays. As a result, the three-dimensional video display device 1 can enable the observer M to visually recognize a smooth three-dimensional video T with a continuous luminance distribution.

[0026] [Comparison with Conventional Device] Next, regarding the depth size of the device, the three-dimensional video display device 1 (Fig. 2) and a conventional three-dimensional video display device 100 (Fig. 10) are compared. As shown in Fig. 2, let the distance between the point light source array unit 12 and the multi-view video display unit 11 of the three-dimensional video display device 1 be d1, and the distance between the multi-view video display unit 11 and the diffusion screen 13 be d2.

[0027] Here, in order to display the three-dimensional video T with the multi-view video I, it is necessary to irradiate two or more overlapping areas on all areas of the diffusion screen 13 except for the peripheral part. Therefore, the distance d2 between the multi-view video display unit 11 and the diffusion screen 13 needs to satisfy d2 > d1. For this reason, the depth size D1 of the three-dimensional video display device 1 is represented by the following formula (2).

[0028]

Equation

[0029] Also, when the installation interval of the point light source L, that is, the display interval of the viewpoint video i, is p1, the viewing angle φ1 of the three-dimensional video display device 1 is represented by the following formula (3).

[0030]

Number

[0031] On the other hand, as shown in FIG. 10, the distance between the multi-viewpoint video display unit 30 and the imaging lens array 32 of the conventional three-dimensional video display device 100 is d3, the focal length of the imaging lens IL, which is the distance between the imaging lens array 32 and the aperture array 33, is f, and the distance between the aperture array 33 and the diffusion screen 31 is d4.

[0032] Here, the distance d3 can be set to "0" by closely arranging the multi-viewpoint video display unit 30 and the imaging lens array 32. However, the focal length f is a positive fixed value and cannot be shortened. Also, in order to display the three-dimensional video T with the multi-viewpoint video I, it is necessary to irradiate two or more overlaps in all regions except the peripheral part on the diffusion screen 31. Therefore, the distance d4 between the aperture array 33 and the diffusion screen 31 needs to satisfy d4 > 2f. Thus, the depth size D2 of the three-dimensional video display device 100 is represented by the following formula (4).

[0033]

Number

[0034] Also, when the installation interval of the imaging lens IL, that is, the display interval of the viewpoint video i, is p2, the viewing angle φ2 of the three-dimensional video display device 100 is represented by the following formula (5).

[0035]

Number

[0036] Here, considering that the three-dimensional video display device 1 and the three-dimensional video display device 100 display geometrically equivalent three-dimensional videos, the conditions are that the viewing angle φ1 = φ2 and the display interval p1 = p2 of the viewpoint videos. Therefore, substituting these into equations (2), (3), and (5) and arranging them, the depth size D1 of the three-dimensional video display device 1 is D1 > 2f. On the other hand, from equation (4), the depth size D2 of the three-dimensional video display device 100 is D2 > 3f.

[0037] In this way, since the three-dimensional video display device 1 does not have an imaging lens compared to the conventional three-dimensional video display device 100, there is no need to secure a focal length, and the depth size can be shortened to a maximum of 2 / 3. As a result, the three-dimensional video display device 1 can have a thinner device configuration than the conventional three-dimensional video display device, and a three-dimensional video display device for home use can be realized.

[0038] <Second Embodiment: Three-Dimensional Video Display Device> Next, with reference to FIGS. 1 and 4, the three-dimensional video display device 1B according to the second embodiment of the present invention will be described.

[0039] The three-dimensional video display device 1B displays a three-dimensional video. This three-dimensional video display device 1B displays a three-dimensional video T having parallax in the horizontal and vertical directions. The three-dimensional video display device 1B is different from the three-dimensional video display device 1 (FIG. 2) in that the individual viewpoint videos i of the multi-viewpoint video I are irradiated toward the center of the diffusion screen 13. As a result, the three-dimensional video display device 1B can expand the viewing angle.

[0040] As shown in FIG. 1, the three-dimensional video display device 1B mainly includes a display unit 10B, and further includes a control unit 20 that controls the display unit 10B. In particular, as shown in FIG. 4, the display unit 10B includes a multi-viewpoint video display unit 11, a point light source array unit 12B, and a diffusion screen 13. Since the multi-viewpoint video display unit 11 and the diffusion screen 13 have the same configuration as the three-dimensional video display device 1 described in FIG. 2, the description thereof will be omitted. However, each viewpoint image i of the multi-viewpoint image I to be displayed on the multi-viewpoint image display unit 11 is an image that irradiates the entire predetermined display area R, which is the same area of the diffusing screen 13.

[0041] This multi-viewpoint image I is, for example, as shown in FIG. 5, an image captured by a multi-viewpoint camera MC composed of a plurality of arranged cameras C, with each camera C directed toward the object O. Note that the multi-viewpoint image I is not limited to an image captured from the real space, and may be an image generated by CG or the like. In that case, the multi-viewpoint image I may be generated by virtually capturing the CG space using the cameras C shown in FIG. 5 as virtual cameras.

[0042] The point light source array unit 12B is disposed on the back surface of the multi-viewpoint image display unit 11 and is a backlight that irradiates each viewpoint image i of the multi-viewpoint image I displayed by the multi-viewpoint image display unit 11 from the back surface. This point light source array unit 12B is composed of a plurality of point light sources L B (point light source group).

[0043] The point light source L B is a high-brightness and fine light source similar to the point light source L of the point light source array unit 12 (FIG. 2), and is a micro LED or the like. Each point light source L B is arranged on the line connecting the center P M of the display position of each viewpoint image i of the multi-viewpoint image I displayed on the multi-viewpoint image display unit 11 and the center P C (0, 0, 0) of the diffusing screen 13, and the optical axis is eccentric so as to pass through the center P C of the diffusing screen 13. Here, let the distance between the multi-viewpoint image display unit 11 and the diffusing screen 13 be d5, and the depth size of the three-dimensional image display device 1B be D3. In this case, the center P B of the point light source L L can be determined by the following formula (6).

[0044]

Equation

[0045] The control unit 20 supplies power to the display unit 10B and outputs the multi-view video I, which is the same as the control unit 20 described with reference to FIG. 2. However, as described above, the multi-view video I output by the control unit 20 to the display unit 10B is a video in which each individual view video i irradiates the entire display area of the diffuser screen 13.

[0046] As described above, compared with the conventional three-dimensional video display device described in Patent Document 2, the three-dimensional video display device 1B does not have an imaging optical system, so there is no need to secure the focal length of the imaging lens, and the depth size can be shortened.

[0047] <Third Embodiment: Three-Dimensional Video Display Device> Next, with reference to FIGS. 1 and 6, a three-dimensional video display device 1C according to the third embodiment of the present invention will be described.

[0048] The three-dimensional video display device 1C displays a three-dimensional video. This three-dimensional video display device 1C displays a three-dimensional video T having parallax in the horizontal and vertical directions. The three-dimensional video display device 1C increases the number of viewpoints by switching the positions of the multi-view videos I displayed in time series within a predetermined time compared with the three-dimensional video display device 1 (FIG. 2).

[0049] The three-dimensional video display device 1 (FIG. 2) always lights the point light source L and fixes the position of the corresponding multi-view video I to display the three-dimensional video T. On the other hand, the three-dimensional video display device 1C (FIG. 6) lights and extinguishes the point light source L in time series, and increases the number of viewpoints pseudo-statically by displaying the view video i at the position corresponding to the lit point light source L. As shown in FIG. 1, the three-dimensional video display device 1C mainly includes a display unit 10C, and further includes a control unit 20C that controls the display unit 10C.

[0050] The display unit 10C has the same configuration as the display unit 10 of the three-dimensional video display device 1 described with reference to FIG. 2. However, as shown in FIG. 6, the display unit 10C switches the point light sources L that are turned on and off between odd frames and even frames, and also switches the display positions of the viewpoint videos i that constitute the multi-viewpoint video I.

[0051] The diffusion angle of the diffusion screen 13 of the display unit 10C is the angular interval θ3 between the line segment connecting the point light source L1 that is lit and the center P of the diffusion screen 13 C and the line segment connecting the point light source L2 that is turned off and adjacent to the point light source L1 and the center P of the diffusion screen 13. C is. Note that the angular interval θ3 is strictly different depending on the position of the point light source L. Therefore, the diffusion angle of the diffusion screen 13 may be the maximum value that the angular interval θ3 can take. Specifically, when the installation interval of the point light sources L is p3 and the distance from the point light source array unit 12 to the diffusion screen 13 is D4, the diffusion angle of the diffusion screen 13 may be the maximum value of θ3, max(θ3), shown in the following formula (7).

[0052]

Equation

[0053] The control unit 20C supplies power to the display unit 10C and outputs the multi-viewpoint video I. For example, as shown in FIG. 7, the control unit 20C controls the supply of power to the point light source array unit 12 so as to alternately switch the point light sources L and L1 that are turned on and the point light sources L and L2 that are turned off between the odd frame shown in FIG. 7(a) and the even frame shown in FIG. 7(b).

[0054] In the example of FIG. 7, the control unit 20C controls so that the lighting and extinguishing of the point light source L alternate differently in the horizontal and vertical directions, respectively. Furthermore, the control unit 20C synchronizes with the lighting / extinguishing of the point light source L, and displays the multi-view video I on the multi-view video display unit 11 such that the corresponding viewpoint video i is located at the position irradiated by the lighting point light source L. Note that the multi-view video I has different viewpoint positions in individual viewpoint videos i, and the multi-view video I displayed in odd frames O and the multi-view video I displayed in even frames E further have different viewpoint positions.

[0055] In this way, similar to the three-dimensional video display device 1, the three-dimensional video display device 1C can shorten the depth size compared with the conventional three-dimensional video display device, and can display a three-dimensional video with high depth reproducibility and resolution by pseudo-increasing the number of viewpoints.

[0056] In the example of FIG. 7, the arrangement of the point light sources L is a square arrangement, but as shown in FIG. 8, the point light sources L may be in a delta arrangement (stacked arrangement). In the example of FIG. 8, the point light source L2 is arranged by shifting the point light source L1 by 1 / 2 of the distance between the point light sources L1 in the horizontal direction and the vertical direction from the position of the point light source L1.

[0057] Also, here, an example is shown in which the light emission / extinguishing of the point light source L is switched in the time direction and the multi-view video I is displayed by 2-division multiplexing. However, the multiplexing number is not limited to "2". For example, as shown in FIG. 9, for each of the 2×2 = 4 point light sources Lx4 in the horizontal and vertical directions, by sequentially switching the light emission position of one point light source L and the extinguishing of the other three point light sources L in the time direction, the multi-view video I may be displayed by 4-division multiplexing. Also in this case, the control unit 20C displays the multi-view video I on the multi-view video display unit 11 such that the corresponding viewpoint video i is located at the position irradiated by the lighting point light source L. Here, the position of the lighting point light source L and the position of the multi-view video I to be displayed are switched for each frame. However, this switching may be performed not for each frame but for a plurality of frames.

[0058] Also, here, the three-dimensional video display device 1C, similar to the three-dimensional video display device 1 (Fig. 2), has each viewpoint video i irradiate the diffusion screen 13 partially. However, the three-dimensional video display device 1C may, similar to the three-dimensional video display device 1B (Fig. 4), have each viewpoint video i irradiate the entire display area of the diffusion screen 13. In that case, the point light source L of the point light source array unit 12 may be arranged so that the optical axis passes through the center P C of the diffusion screen 13.

[0059] In this way, by multiplexing and displaying the display positions of the multi-viewpoint video I in the time direction, the three-dimensional video display device 1C can increase the number of viewpoints and display a three-dimensional video with high depth reproducibility and resolution. Also, since the three-dimensional video display device 1C has no imaging optical system, similar to the three-dimensional video display device 1 (Fig. 2), it can have a thinner device configuration than conventional three-dimensional video display devices.

Explanation of Reference Numerals

[0060] 1, 1B, 1C Three-dimensional video display devices 10, 10B, 10C Display units 11 Multi-viewpoint video display unit 12, 12B Point light source array units 13 Diffusion screen 20, 20C Control units L Point light source I Multi-viewpoint video i Viewpoint video T Three-dimensional video

Claims

**Claim 1** A three-dimensional video display device for displaying a three-dimensional video, comprising: A rear transmissive multi-viewpoint video display unit that displays a multi-viewpoint video composed of a plurality of viewpoint videos at different viewpoint positions; An array of point light sources disposed on the back of the multi-viewpoint video display unit, the array of point light sources being composed of a plurality of point light sources that irradiate individual viewpoint videos of the multi-viewpoint video displayed by the multi-viewpoint video display unit from the back; A diffusing screen that superposes and irradiates individual viewpoint videos of the multi-viewpoint video displayed by the multi-viewpoint video display unit from the back, and diffuses the light on the front surface to display the three-dimensional video, wherein the point light source has a light distribution angle for irradiating the entire corresponding viewpoint video, characterized in that it is a three-dimensional video display device. **Claim 2** Each of the viewpoint videos constituting the multi-viewpoint video is a video that partially irradiates the diffusing screen, wherein the array of point light sources irradiates the entire display area of the diffusing screen with the entire viewpoint videos constituting the multi-viewpoint video, characterized in that it is a three-dimensional video display device according to claim 1. **Claim 3** Each of the viewpoint videos constituting the multi-viewpoint video is a video that irradiates the entire display area of the diffusing screen, wherein the point light source constituting the array of point light sources irradiates the entire corresponding viewpoint video, and the optical axis is eccentric and is disposed at a position where the optical axis passes through the center of the diffusing screen, characterized in that it is a three-dimensional video display device according to claim 1. **Claim 4** A three-dimensional video display device for displaying a three-dimensional video, comprising: A rear transmissive multi-viewpoint video display unit that displays a multi-viewpoint video composed of a plurality of viewpoint videos at different viewpoint positions; An array of point light sources disposed on the back of the multi-viewpoint video display unit, the array of point light sources being composed of a plurality of point light sources that irradiate individual viewpoint videos of the multi-viewpoint video displayed by the multi-viewpoint video display unit from the back; A diffusing screen that superposes and irradiates individual viewpoint videos of the multi-viewpoint video displayed by the multi-viewpoint video display unit from the back, and diffuses the light on the front surface to display the three-dimensional video, wherein each of the viewpoint videos constituting the multi-viewpoint video is a video that irradiates the entire display area of the diffusing screen, wherein the point light source constituting the array of point light sources irradiates the entire corresponding viewpoint video, and the optical axis is eccentric and is disposed at a position where the optical axis passes through the center of the diffusing screen, characterized in that it is a three-dimensional video display device. **Claim 5** The multi-viewpoint video display unit switches and displays multi-viewpoint videos with different viewpoint positions in the time direction within a predetermined time. The point light source array unit lights point light sources corresponding to individual viewpoint videos of the multi-viewpoint videos switched and displayed within the predetermined time, and turns off the other point light sources. The three-dimensional video display device according to any one of claims 1 to 4, characterized in that.

Images