JP3533904B2 - Projection type stereoscopic display device and image projection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device that enables stereoscopic vision using binocular parallax.

[0002]

2. Description of the Related Art A projection type display device which enables stereoscopic vision by using binocular parallax is a screen for exclusive use of image signals obtained by outputting image signals for the right eye and the left eye from at least two image projecting means. It is projected on and viewed, and it is divided into a method of wearing large and special glasses and a method of not wearing it.

First, as a method of wearing special spectacles, two image projection means are used, and a transparent screen of a method of wearing stereoscopic vision by wearing special spectacles such as a filter spectacle method and a liquid crystal shutter method, There is a projection type 3D display using a reflection type screen (basic of 3D image, Takehiro Izumi supervised pages 138-143). The screen used here does not exhibit directivity, and the light emitted from the image projection means to the screen diffuses vertically and horizontally to the viewer.

Next, as a method of not wearing special glasses, a projection type three-dimensional display device of a method using two or more image projection means (basic of three-dimensional image, fountain)
Takehiro, pp. 148-168, 3D image engineering, Takataka Ogoshi, pp. 83-97). In the transmissive and reflective screens used here, incident light is diffused vertically to the viewer but is condensed horizontally. Due to the directivity of such a screen, the projection type stereoscopic display device of this system enables stereoscopic viewing at a specific viewing position without wearing special glasses. Further, in the case of this method, it is necessary to make the intervals between the plurality of image projecting means coincide with the intervals between both eyes of the viewer in the horizontal direction with respect to the viewer.

[0005]

In the above-mentioned conventional projection type stereoscopic display device, the vertical positions of the centers of the optical systems of the two or more image projecting means are the same, and the overall shape of the image projecting means is the same. It was horizontally long. Therefore, it occupies a large floor area and is inconvenient to use.

[0006]

In a projection type stereoscopic display device having an image projecting means and a screen having a diffusing means in a direction vertical to a viewer, at least adjacent image projecting means of a plurality of image projecting means are provided. The vertical position of the center of the optical system is changed.

[0007]

FIG. 1 is a schematic diagram of an image projection apparatus which constitutes a projection type stereoscopic display apparatus according to an embodiment of the present invention.

The vertical positions of the centers of the optical systems of the two image projection means are different. Therefore, it is possible to configure the image projection means for the right eye and the image projection means for the left eye in close proximity to each other in the horizontal direction, the overall shape of the image projection means can be shortened in the horizontal direction, and the image projection means can be housed in the housing. The image projection device can be made compact in the horizontal direction. Thus, even if the positions of the two image projection means are different from each other in the vertical direction with respect to the viewer, stereoscopic viewing is possible because of diffusion in the vertical direction of the screen. In particular, in a method that does not require wearing special spectacles such as a lenticular method, the distance between the image projection means needs to match the distance between the viewer's right and left eyes in the horizontal direction with respect to the viewer. The present invention is particularly effective for satisfying this condition. Also, the horizontal viewing range at the viewing point matches the horizontal width of the output image signal from the lens of the image projection means. Therefore, in order to maximize the viewing range without mixing the image signal for the right eye and the image signal for the left eye, the horizontal width of the output image signal in each lens forming the plurality of image projecting means is It is preferable that the distance is equal to the horizontal distance between the image projection means. According to the present invention, this condition can be satisfied and a good viewing area can be secured. A projection type stereoscopic display device is obtained by combining such an image projection device with a transmissive or reflective screen.

The effect that the overall shape of the image projecting means of the present invention can be shortened in the horizontal direction, and the effect that the image projecting apparatus can be made compact in the horizontal direction is that the number of image projecting means is three or more. , Even more effectively. FIG. 2 shows an image projection apparatus in which four image projection means are integrated. In a projection type three-dimensional display device without wearing special spectacles, as shown in FIG. 3, image projection means are installed at intervals of the viewer's right eye and left eye, and depending on the position of the image projection means. It is possible to widen the viewing range by outputting such an image, and to provide the viewer with image information from the side, which has the effect of increasing the sense of presence. The present invention is particularly effective when the number of image projection means is increased. In addition, when a viewer moves left and right when stereoscopic viewing is performed by a large number of image projecting means as described above, the image projecting means corresponding to the viewing point is sequentially changed. When such a change in the viewing point occurs, an image skip occurs due to the discontinuity of the displayed image. This image jump can be reduced by making the image projection means smaller than the distance between both eyes. As described above, the present invention is particularly effective when the image projecting means is arranged closer than the distance between the eyes.

Further, the present invention is not limited to the case where a plurality of image projecting means are integrated to form one image projecting apparatus, but the image constructed by one image projecting means as shown in FIG. It is also effective when using a plurality of projection devices.

Further, as shown in FIG. 5, by disposing one mirror between the image projecting means described above and the directional screen, and changing the direction of the image signal, the entire projection type three-dimensional display device. The depth of can be reduced. Further, when a reflection type screen as shown in FIG. 5 is used, there is an effect that the viewing position is widened. Here, the stereoscopic image projection device may be installed at any of the top, bottom, left, and right positions facing the screen. Further, as shown in FIG. 6, two mirrors may be used. In this case, the position of the mirror also needs to be different in the vertical direction.

[0012]

According to the present invention, even when many image projection means are used, they can be used without occupying a large floor area.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an image projection device that constitutes a projection type stereoscopic display device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of an image projection device that constitutes a projection type stereoscopic display device according to an embodiment of the present invention.

FIG. 3 is a schematic view of a projection type stereoscopic display device according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of an image projection device that constitutes a projection type stereoscopic display device according to an embodiment of the present invention.

FIG. 5 is a schematic view of a projection type stereoscopic display device according to an embodiment of the present invention.

FIG. 6 is a schematic view of a projection type stereoscopic display device according to an embodiment of the present invention.

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-9-218462 (JP, A) JP-A-8-240788 (JP, A) JP-A-9-101483 (JP, A) JP-A-7- 294848 (JP, A) JP-A-9-197581 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 35/18 G02B 27/22

Claims (4)

(57) [Claims] 1. A projection-type stereoscopic display device having two or more image projecting means, a diffusing means in a direction vertical to a viewer, and a condensing means in a horizontal direction, and at least adjacent images among the image projecting means. A projection-type stereoscopic display device characterized in that the vertical position of the optical system center of the projection means is different. 2. Each lens of the lenses constituting the image projection means
The width of the output image signal in the horizontal direction is
Characterized by being equal to the horizontal distance between the projection means
The projection type three-dimensional display device according to claim 1. 3. Reflection between the image projection means and the screen
The projection according to claim 1 or 2, further comprising a mirror.
Emissive stereoscopic display device. 4. An image projecting means comprising two or more image projecting means.
Optical system of at least adjacent image projection means of the shadow means
Characterized by different vertical positions of the center
Image projection device.