Abstract: A three-dimensional image reproducer receives a video signal including three-dimensional information including X and Y information constituting a plane and Z information constituting a depth. This apparatus causes particles to fall with respect to one line. The line from which the particles fall is changed in the Z direction based on the Z information. A light source generates a light beam toward the falling particle based on a video signal. The generated light beam is scanned in the X and Y directions. The focal point of the light beam is controlled to move in the Z direction in synchronism with the change of the line from which the particles fall. The image formed by the particles is viewed as a three-dimensional image if viewed from the Z direction.

Abstract: A three-dimensional display device comprising an evacuated enclosure (45). A phosphor coated screen (44), means to rotate the phosphor coated screen, one or more electron gun (41-43) and control means to drive the one or more electron gun. Sequential image Frames (FIGS. 2b-2f) are written to the rotating phosphor coated screen (44) by the one or more electron gun (41-43) for a number of image sectors. Provided the screen rotates sufficiently rapidly and the phosphor coating has the required persistence the human eye will perceive a three-dimensional image within the display volume swept out by the phosphor coated screen. In the preferred embodiment the planar screen (44) rotates about a vertical axis with three electron guns (41-43) located below the display volume directed upwardly towards the center of the display volume. In another embodiment the display screen is in the form of a helix (51) with the electron gun (52) being aligned substantially along the axis of rotation of the helix.

Abstract: An image display system comprises polarization spectacles having different polarization axes with or without .lambda./4-foils of both polarization lenses forward of the eyes of the person to be tested. The system of the invention further includes an image display device for generating light with a specific direction of polarization or a specific rotational direction of the circularly polarized light. The image display device comprises essentially at least one vectograph film and at least one image screen. This arrangement can so influence the light coming from the image screen that test figures or parts thereof can be seen by only one eye or by both eyes. If the image display system is to be used as a vision testing system and the test figures are to be changed, then there is a corresponding command of a drive circuit via a memory. The drive circuit drives the image screen in a suitable manner. A color display can be provided by making an appropriate modification to the image display device.

Abstract: A segmented direct volume display device includes a volume containing a medium, two mutually orthogonal matrices of light guns capable of providing light beams, each matrix outputting light at different wavelengths, a unit for generating images in the volume by selectively activating the light guns, an image being formed at the intersection of two beams, one from each of the two matrices, and a unit for displaying images in different colors in different segments of the volume. The segmented direct volume display device may further include, on display planes of the volume, a filter for blocking out light output from the light guns while allowing viewing of the image. The segmented direct volume display device may also include individual filters, external to the volume, for each segment. The individual filters block out light from images in other segments while allowing viewing of a generated image within a corresponding segment.

Abstract: A three-dimensional energy distribution device includes a volume reacting to the energy of a predetermined radiation; a plurality of sources of the radiation illuminating the volume according to respective angles; and, placed between each source and the volume, a support that is transparent to the radiation and that includes an image corresponding to a density projection of a real or virtual object examined at the angle the respective source illuminates the volume, the projection having been subjected to an image correction process.

Abstract: A stereoscopic picture system which offers a natural, stereoscopic picture allowing a plurality of people to see it at a time without wearing polarizing glasses. The stereoscopic picture system includes: a camera for identifying an image of a subject as an electrical signal; a control circuit for converting the electrical signal identified by the camera into control signals corresponding to x coordinate, y coordinate and z coordinate of three-dimensional coordinate system; a stereoscopic display panel having three-dimensionally arranged pixels for displaying a stereoscopic picture; and a driver circuit for driving the stereoscopic display panel on the basis of the control signals corresponding to x coordinate, y coordinate and z coordinate, which are fed from the control circuit.

Abstract: Apparatus for relieving eyestrain and fatigue. A plurality of light sources, arranged in a selected three-dimensional pattern around a video display terminal, automatically cycling through a selected sequenced pattern at chosen time intervals for specific time periods, provides stimulation for the eyes away from the two-dimensional surface of the terminal screen. Colors and shapes of the light sources may be varied in order to maintain user interest.

Abstract: The invention relates to a display arrangement for displaying a three-dimensional image to an observer. The arrangement comprises a first display element (D.sub.1) arranged at a distance from the observer and a second display element (D.sub.2) arranged in the field of view between the observer (OB) and the first display element (D.sub.1) in the immediate vicinity of the observer. To produce a complete volume image in three dimensions, the image volume is sampled during a time interval corresponding to the typical integration time of the observer. After processing, the sample information is utilized partly in the first display element (D.sub.1) for displaying a first subset of image information included in the three-dimensional image and partly in the second display element (D.sub.2) for displaying a second subset of image information included in the three-dimensional image.

Abstract: A display which writes an image directly on the retina of an eye. The display includes a laser which produces a collimated light beam that is modulated with video information and is then scanned and directed through the eye pupil to produce an image on the retina. The scanning uses micro-machined mirrors, electro-optic or acousto-optic devices which are extremely small and require very low power.

Abstract: An autostereoscopic display with an optical element inserted near the transmissive display has improved brightness of the display, and optionally has incorporated therein a head position sensing device capable of sensing the position of at least one observers head causing the light emitting regions of the device to move in response to data on the observer's head position provided by the head sensing device.