JP2707549B2 - Pseudo three-dimensional video projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a) Field of Industrial Use A device capable of projecting a two-dimensional image to view a three-dimensional image, and more particularly to a simple plane using a single projector without flicker. The present invention relates to a pseudo stereoscopic video projection device capable of viewing a pseudo stereoscopic video by switching to a video. b) Conventional technology For stereoscopic images, images taken by two cameras from a position corresponding to the binocular disparity of a human are projected by two projectors, and the images are projected by the left eye and the right eye using polarized glasses or the like. It is well known how to view images taken by different cameras. On the other hand, there has been proposed a method of viewing a three-dimensional image using one two-dimensional image (for example, a normal TV signal). For example, the same image is shifted left and right on a CRT
There is a way to project multiple images. As a specific implementation method, one CRT is provided with two electron guns for video, or switching is performed for each frame of a TV signal. c) Problems to be solved by the present invention According to the example of the pseudo three-dimensional display device described in the section of the prior art,
The former is very expensive because of the special display tube, and the latter has the drawback of causing flicker. In order to solve these problems and obtain the same effect, two TV receivers or two projectors were required. d) Means for solving the problem 2 different angles 2 are provided on the front of the projector projection lens.
The first type prism and the second type prism are provided with, for example, polarizing plates that are orthogonal to each other, and the image passing through the first type prism and the image passing through the second type prism are The angle of the prism is determined so that an image is formed on the screen in a horizontal direction with a shift of less than the distance between human eyes (for example, 2 to 6 cm). The device in which the prism and the polarizing plate are integrated can be detached as an adapter for the projector. The viewer observes the two images using polarized glasses that are orthogonal for the left eye and the right eye. e) Function The prism provided on the front surface of the projection lens has a role of projecting the same image by shifting it to two places. Further, the respective images are projected through polarizing filters orthogonal to each other, and when viewed with polarized glasses, the left eye and the right eye see images at different positions. Therefore, two identical images are superimposed in the horizontal direction and observed with the left and right eyes, respectively. As a result, as shown in FIG. 2, the image appears to be equivalently present behind the screen (screen). However, there are a number of factors other than binocular parallax that bring about a three-dimensional effect or a sense of distance, and the position of the virtual image 103 in FIG. 2 is not always sensory. For example, a clear image, a colorful image, a large image, an image with a large contrast, a bright image, an unshaken image, etc. are seen in the foreground, and the opposite image is seen in the back. In addition, spatial factors such as the arrangement of the image in the screen also influence. As a result, the closest image is on the screen 104 in FIG. 2 and the far image is the virtual image 1 in FIG.
It will be in the 03 position, and you can watch a three-dimensional image. By the way, according to the present invention, a stereoscopic image is viewed by attaching an adapter to the front of the projector projection lens. Therefore, a pseudo stereoscopic image can be easily obtained simply by attaching the adapter. f) Embodiment FIG. 1 shows an embodiment. FIG. 1 (a) shows an example in which a prism adapter is mounted, FIG. 1 (b) shows a projection screen, and FIG. 1 (c) shows an example in which a prism adapter is mounted on a projector. First, the prism adapter of FIG. 1A is configured as follows. That is, the light that has passed through the prisms A and A ′ is refracted in the (R) direction and becomes a polarized wave whose direction is regulated by the R polarizing plate 1. The light that has passed through the prisms B and B ′ is refracted in the (L) direction, and becomes a polarized wave whose direction is regulated by the L polarizing plate 2. Here, the directions of the polarized light of the R polarizing plate and the L polarizing plate are made different from each other, and the directions of the polarized light of the spectacles of the observer substantially match those of the right and left eyes. Usually, they are selected in a direction almost orthogonal. As a result, as shown in FIG. 1 (b), a double shot image shifted in the horizontal direction is projected on the screen, and the polarization directions of the two images are different. Will see images at different positions. Here, the distance between the two images is selected to be 2 to 6 cm on the screen. The range was smaller than the distance between human eyes and the range where the stereoscopic effect due to binocular parallax was clearly obtained was selected. FIG. 1 (c) is a view in which the above-mentioned prism adapter is attached to the projector. However, if the prism adapter is removed, it goes without saying that the projector operates as a normal planar image projector. g) Effects of the Invention By attaching the prism adapter to a conventional projector, a pseudo three-dimensional image can be viewed, so that it can be easily realized using one existing projector, and a three-dimensional image without flicker is obtained. Can be

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an embodiment, FIG. 1 (a) is a prism adapter,
FIG. 1B shows a projection screen, and FIG. 1C shows a projector. FIG. 2 is a diagram illustrating the principle of a pseudo solid. A, A '... (R) direction refraction prism B, B' ... (L) direction refraction prism 1 ... R polarizing plate 2 ... L polarizing plate

Claims (1)

(57) [Claims] 2 different angles on the front of the projector projection lens
A plurality of types of prisms are arranged alternately in the vertical and horizontal directions, and a first type prism and a second type prism are provided with polarizing plates having different directions from each other. A pseudo-stereoscopic image projection apparatus, wherein an image having passed through a second type of prism is formed on a screen in a horizontal direction with a shift within a distance between human eyes.