JPH04194907A - Stereoscopic image display device - Google Patents

Abstract

PURPOSE:To allow stereoscopic image display by using a rotary mirror optical system in such a manner that the optical axes of respective elements coincide substantially with the optical axis of an observer. CONSTITUTION:The light crystal space modulating element arrays 101 to 105 having the respective optical axes within the same horizontal plane are successively irradiated with prescribed timing pulses by respective semiconductor laser light source arrays or white light source arrays 301 to 306. The light rays are reflected by the perpendicular plane of a rotationally driven polygon mirror 6 and form multiple images 401 to 406 spaced respectively by DELTA on the front surface of an observation position 5 via an imaging lens 5. The polygon mirror 6 has the perpendicular mirror surfaces of an octahedron and the respective space modulating elements are irradiated with luminous flux pulses. The high-quality stereoscopic images free from flickers when viewed from the observer 5 are obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a display device for medical diagnosis, etc., which is capable of displaying a stereoscopic image in real time by synthesizing computer images or video signals.

BACKGROUND OF THE INVENTION Various stereoscopic display techniques have been developed, ranging from simple two-lens stereoscopic viewing to true stereoscopic display using holography. On the other hand, a series of medical diagnostic systems such as NMR, CT, and ultrasonic diagnostic equipment or C
AD (Computer-aided design)
Supported by the rapid development of computer systems such as
The final display form of these systems remains essentially a two-dimensional image. Holographic stereograms are one step closer to a form that synthesizes and displays these two-dimensional images and provides natural parallax. It is extremely difficult to achieve real-time performance, and there are limitations in terms of image quality. = Also, as another method of using holography, as shown in FIG. 3, a multiple recording hologram 2 is illuminated with a laser light source 1, and multiple images 40, 41,
..., 43 are reproduced on different planes of space, and the so-called "Se6 jhr" is reproduced in-line (optical axis 22) l.
Attempts have been made to obtain fluoroscopic images, which are of interest to medical scientists.

Problems to be Solved by the Invention In the conventional technology, real-time technology is good in terms of image quality, such as a two-lens 3D television system, but the amount of information is limited in terms of 3D display.On the other hand, holography, which has a large amount of information, The formula lacks real-time performance, and the image quality is poor due to deterioration due to speckle noise.
Real-time display is possible, and high-quality images can be displayed on at least 10 or more screens.
The image can be displayed three-dimensionally as a through'' image.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention uses a plurality of spatial modulation elements capable of displaying images in real time, an image signal source, and each element can be illuminated in a pulsed manner at a predetermined timing. This objective can be achieved by using means such as a light emitting light source array, a rotationally driven reflecting mirror, and an imaging lens.

Function: In the present invention, spatial modulation element arrays individually driven by the videoray 1 are arranged in parallel, and a rotating mirror optical system is arranged so that the optical axis of each element substantially coincides with the observer's optical axis. By applying pulse illumination to each spatial modulation element row at a predetermined timing, all image planes can be observed lined up on the same optical axis.Moreover, each screen is spaced apart by a predetermined interval along the optical axis. Three-dimensional image display is possible by arranging the two image planes so that they are located on the same plane, and since there is no interference between the respective image planes, it is possible to display an extremely clear and high-quality image.

Embodiment FIG. 1 is a plan view of a schematic configuration showing an embodiment of the present invention, in which liquid crystal spatial modulation element arrays 101, 102, . . . , 106 il each have a semiconductor laser, each having an optical axis in the same horizontal plane. Light source row or white light source row 301, 30
2, . . . , 306, pulse illumination is sequentially applied at a predetermined timing, and after reflection on the vertical plane of the rotationally driven polygon mirror 6, it is illuminated through the imaging lens 5 to the front (toward) of the observation position 5.
Multiple images 401, 402, spaced apart by △, respectively.
, 406 is formed. Here, polygon mirror 6 is 8
It has a vertical mirror surface in the form of a face, and when driven at 225 revolutions per minute, each spatial modulation element is sequentially illuminated with high-speed pulses at a rate of 30 times per second, creating a flicker-free, high-quality 3D image from the perspective of the observer 5. will be obtained. The spatial modulation element uses a black and white or color video screen as a signal source 701,
702, . . . 706 are operated manually, and the continuous drive deviation is good, and the semiconductor laser arrays 301, 302, . . .
306 by direct pulse modulation, or in the case of a white light source, stable stereoscopic display is possible by driving a high-speed shutter array in synchronization with the rotating mirror 6.

In addition, in order to give each image plane interval Δ, the spatial modulation element 10
1, 102, . . . , 106 are arranged so that their distances from the center of the rotating mirror are slightly different.

FIG. 2(a)l;t is a schematic configuration diagram illustrating a second embodiment of the present invention, and only portions different from the first embodiment are shown. That is, instead of the imaging lens system 5, the first Fourier transform lens 2 is used for the spatial modulation element 103.
03 (the first Fourier transform lens is also used for each of the other spatial modulation elements not shown) and the second Fourier transform lens 55 (common to the whole) to form an image 403. This makes it possible to use it effectively.

(b) shows (a) as an in-line isolateral optical system, and the image plane sequentially changes from 401 to 406 depending on the rotating mirror angle and the light emission timing of the light source.

In addition, in both Figures 1 and 2, the lenses 201 to 206 each serve as a collimating lens or a field lens.

In addition to the polygon mirror, a galvanometer mirror 1 or a plane mirror fixed on a motor and made rotatable may be used. Moreover, instead of the spatial modulation element, a plurality of types of image plane holograms recording stereoscopic images having a certain depth may be arranged. As frame memory or video signal sources 701, 702, ..., 706 (
41 Computer-generated images that can utilize real-time properties, such as ultrasonic diagnostic images, are suitable.

Effects of the Invention The present invention enables highly realistic and easy-to-see 3D display by displaying 3D information decomposed into 10 to several dozen images in-line in real time, and has great effects in fields such as medical diagnosis. It is possible to demonstrate this.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a stereoscopic image display device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an apparatus according to another embodiment. FIG. 3 is a schematic diagram of a conventional three-dimensional image forming apparatus. 101-106... Spatial modulation element row, 201-20
2... Lens; top 301-306... Pulse light source 401-406... Composite solid (1°701
~706...Video signal is poor 2...Multiple recording hologram, 5...Imaging lens', 6...Polygon mirror, 203...First Fourier transform lens, 5
5... Name of the second Fourier transform lens agent Patent attorney Akira Okaji 2 people NC'V, l-~ Kidney Ward atsu

Claims (4)

[Claims] (1) N light source arrays that can individually emit light at predetermined timings, and N spatial modulators illuminated by each of the light sources and arranged perpendicularly to the optical axis toward the approximate center of a predetermined reflective mirror surface. comprising at least an element array and a drive system that rotates the reflective mirror surface in a plane that includes the optical axis of the light source array and the spatial modulation element array, and individually supplies image signals to each element of the spatial modulation element array. 1. A three-dimensional image display device characterized in that image formation and multiple image synthesis are performed on different planes on substantially the same optical axis as viewed from an observer by using a video signal source or an image memory device. (2) The stereoscopic image display device according to claim 1, characterized in that an imaging lens system is used between the spatial modulation element and the observer. (3) The stereoscopic image display device according to claim 1, characterized in that a pair of Fourier transform lens systems is used between the spatial modulation element and the observer. (4) The stereoscopic image display device according to claim 1, wherein the spatial modulation element is a liquid crystal display device and is supplied with a predetermined image signal at a video rate.