Abstract: A holographic reconstruction system and a corresponding holographic reconstruction method are disclosed. The holographic reconstruction system comprises light source means for providing substantially coherent light, reconstruction means for holographically reconstructing a scene and for producing a visibility region from where the viewer can view the holographically reconstructed scene, and deflection means for positioning the visibility region. The aim of the invention is to improve the visibility region of a holographic reconstruction system. To achieve this aim, the holographic reconstruction system comprises deflection drive means for continuously rotating or pivoting the deflection means about a rotational axis at a rotary frequency, thereby displacing the visibility region.

Abstract: Disclosed is a holographic display including a spatial light modulator, and including a position detection and tracking system, such that a viewer's eye positions are tracked, with variable beam deflection to the viewer's eye positions being performed using a microprism array which enables controllable deflection of optical beams.

Abstract: A light modulator is disclosed for representing complex-valued data, comprising an encoding area that has an arrangement of pixels, the phase of which can be controlled. This largely avoids an interfering optical path difference between adjacent pixels or pixel groups when a complex value is encoded in several adjacent phase pixels of the encoding area, the optical path difference varying according to the angle. One respective specific structured delaying layer, which causes the optical path of an incident linearly polarized beam to change according to the angle, is associated with at least one predefined pixel of a group of adjacent pixels of the encoding area. The thickness of the delaying layer is designed such that the modification of the optical path caused by the delaying layer runs in the opposite direction from the angle-related modification of the optical path difference between individual pixels of the pixel group.

Abstract: A method is disclosed for rendering and generating color video holograms for a holographic reproduction device having at least one light modulation means, wherein a scene divided into object points is encoded as a whole hologram and which can be seen from as a reconstruction a visibility region, which is located within a periodicity interval of the reconstruction of the video hologram. The visibility region defines a subhologram together with each object point of the scene to be reconstructed and the whole hologram is formed from a superposition of subholograms, wherein a 3D rendering graphic pipeline structures a scene represented by image data with depth information into object points and determines and provides at least color and depth information for the object points.

Abstract: The invention relates to a method for generating video holograms for a holographic reproduction device with at least one light modulation means, wherein a scene split into object points is encoded as a whole hologram and can be seen as a reconstruction from a visibility region, which is located within a periodicity interval of the reconstruction of the video hologram. The visibility region, together with each object point of the scene to be reconstructed, defines a subhologram and the whole hologram is generated from a superposition of subholograms, wherein in a sequence of image contents the difference subholograms of object points are preferably generated for each picture, differing in regards to the visibility according to the viewer position in sequential images of the sequence. The display device comprises means that provide high-quality video holograms in spite of the data amount being significantly reduced.

Abstract: A device for correcting the wavelength dependence in diffraction-based optical systems in which certain orders of diffraction are filtered is disclosed, comprising at least one diffractive optical spatial light modulator that has controllable structures, and at least one light source for illuminating the spatial light modulator. Associated orders of diffraction are created which, depending on the wavelength, have a lateral chromatic offset relative to the position of the different extensions thereof on a filter plane defined by the focal length of a downstream optically focusing system, the lateral chromatic offset being in relation to the normal line to the surface of the spatial light modulator. The equinumerous orders of diffraction of different wavelengths overlap to an sufficient extent on a predefined filter plane in relation to both the direction and the extension thereof.

Abstract: Holographic display with which voice and holographic image over internet protocol (VHIOIP) services or communications are provided.

Abstract: A method for generating video holograms is disclosed, principally for a holographic reproduction device, having at least one light modulator in which a scene which is deconstructed into object points is encoded as a complete hologram and can be viewed as a reconstruction from a visibility region. A 3D-rendering graphic pipeline determines color and depth information for the object points of the scene, from which a holographic pipeline determines the complex hologram values.

Abstract: A method is disclosed for reconstructing a three-dimensional scene in a holographic display. A 3D scene that is to be reconstructed is decomposed into object points, and one respective object point is encoded as a sub-hologram in the light modulator. Processor means and reconstruction means are provided for calculating and encoding as well as for reconstructing the 3D scene in order to overcome known drawbacks encountered when encoding a hologram and holographically reconstructing the 3D scene in holographic display devices. Processor elements are provided for generating a movable two-dimensional grid in the light modulating means, forming groups of object points from grid-related object points, and sequentially encoding the holograms of said groups of object points, by means of which intrinsically coherent partial constructions of the groups of object points are generated in a rapid sequence, said partial constructions being incoherent relative to one another.

Abstract: A 3D content generation system comprising a content generating party that generates 2D content and sends that content to a remote intermediary. The remote intermediary processes the content to facilitate subsequent holographic reconstruction and sends the processed content to a holographic display device which locally generates a 3D holographic reconstruction of the content. An advantage is that 2D content may be processed remotely to provide 3D holographic content.

Abstract: A method is disclosed for reconstructing a 3D scene made of object points in a holographic display, wherein the reconstruction is visible from a visibility region. Visibility and/or covering of parts of the 3D scene corresponding to the real parameters is realized, with the reconstruction, for a viewer from every place of the visibility region. Processor means generate a spatial point matrix for defining the positions of individual object points, which are assigned predetermined intensity and phase values. Within the visibility region, a complex-value wave front for each single object point is calculated. The intensity values of the object points are multiplied with the associated visibility function, to determine a common modified wave front of the object points, transformed into the plane of a light modulator to calculate modified control values for the object points.

Abstract: A holographic projection display for reconstructing a 3D-scene and a coding method that indicates an improvement of the control value of coding through an iterative Fourier transformations-algorithm are disclosed. The display includes a reproduction system including at least two reproducing means. First reproduction means for reproducing the illuminating means and for the Fourier transformation of actual wave fronts modulated in the phase modulator follow a second reproduction means, that functions as a screen. The plane of the screen is a Fourier transformation plane for calculations with the iterative Fourier transformation-algorithm and the plane of the phase modulator (6) is the other Fourier transformation plane.

Abstract: A modulation device based on electrowetting cells (EW cells), phase or amplitude or both simultaneously as a complex value of incident light is modulated in each EW cell. An EW cell includes at least one chamber with at least two fluids which are separated by an interface, external and internal electrodes which form electrode pairs activatable by control means, where at least one electrode pair controls the level of the interfaces in the chamber. The internal, mutually functionally independent electrodes inside the chamber are disposed parallel to each other such that the chamber is divided into two communicating sections with two controllable interfaces, where at least one section is transparent and forms the optical path. When at least one electrode pair is activated, the interfaces are mutually displaced such that the path length of the pencils of rays is changed compared with an initial value.

Abstract: A device for the production of holographic reconstructions having light modulators is disclosed. The device comprises at least one pixelated light modulator illuminated by at least one light source, and a focusing optical element field arrangement which images the light sources in an image plane after the light modulator. For the reconstruction, only one order of diffraction of the Fourier spectrum of the hologram should be used. The light modulator is provided with an assigned filter-aperture field arrangement which is located in the area of the image plane of the light source images and which has a plurality of aperture openings. Said aperture openings are designed in such a way that they each allow the passage of a prespecified area of the overall dimensions either smaller or the same as a diffraction order of the diffraction spectrum following Fourier transformation and produced from the holographic coding of the light modulator.

Abstract: A holographic display comprising light sources (L51, L52, . . . ) in a 2D light source array, lenses (L1, L2, . . . ) in a 2D lens array, a spatial light modulator (SLM) and a beamsplitter, in which there are m light sources per lens, and the light sources are in m-to-one correspondence with the lenses. The beamsplitter splits the rays leaving the SLM into two bundles, one of which illuminates the virtual observer windows for m left eyes (VOWL) and the other illuminates the virtual observer windows for m right eyes (VOWR). In one example, m=1. An advantage is 2D-encoding with vertical and horizontal focusing and vertical and horizontal motion parallax.

Abstract: A holographic projection system with a display screen and an optical wave tracking means for controlling the direction of propagation of a modulated wave uses a position controller and an eye finder. An extremely wide tracking range is realised in the projection system for simultaneous viewing of the reconstruction by multiple observers, which are situated beside one another. The reconstruction of the scene is reconstructed for each eye position of an observer such that the entire scene is visible in the visibility region in a large tracking range with minimal errors. The projection system reconstructs the scene with the help of modulated partial waves. Projection means direct these partial waves with separately holographically reconstructed segments of the scene at the desired eye position through a structure of screen segments which are at least horizontally staggered on the display screen.

Abstract: A method for reducing speckle patterns of a three-dimensional holographic reconstruction is disclosed. A controllable light modulator into which a three-dimensional scene is coded is illuminated by coherent light, a reconstruction means projects the modulated light close to an eye position into a space of observation and a control means controls the illumination. This provides a holographic reproduction device in which the speckle patterns occurring during reconstruction of a three-dimensional scene are reduced. Also provided is a next-to-real time method using a carrier medium of conventional image refresh rate.

Abstract: A method for generating video holograms in real time for a holographic playback device comprising at least one light modulator means, into which a scene divided into object points is encoded as an entire hologram and can be seen as a reconstruction from a visibility region, which is located within a periodicity interval of the reconstruction of the video hologram, the visibility region defining a sub-hologram together with each object point of the scene to be reconstructed, and the entire hologram being generated from a superposition of contributions of sub-holograms, is characterized in that for each object point the contributions of the sub-holograms in the entire reconstruction of the scene can be determined from at least one look-up table.

Abstract: A holographic projection system has an optical wave tracking system which adjusts the propagation direction of a modulated wavefront. It provides an adjustable wave tracking system which aligns the modulated wave with a desired eye position of one or more observers and follows the movements of the observer. The system comprises spatial light modulation means which modulate a wave with holographic information for the purpose of holographic reconstruction. The optical wave tracking provides the light path of the modulated wave with a desired propagation direction which guides the modulated wave out of the reconstruction system via a light exit position of a display screen. Position control means set adjustable tracking mirror means in terms of their inclination to a reflection direction for reflecting the modulated wave and deflection means, which are located in the set reflection direction, reflect the wave via the display screen into the desired propagation direction.

Abstract: Disclosed is an imaging device for influencing incident light, comprising an optical element in the form of a mirror and an actuator for deforming the optical element. The optical element has a surface facing the incident light. The actuator laterally grips the optical surface of the optical element in order to deform the optical element.