Patent application number | Description | Published |
20080198430 | Method and Device for Encoding and Reconstructing Computer-Generated Video Holograms - A method and a device for encoding and reconstructing computer-generated video holograms using a conventional LC display: it provides holographic reconstruction of three-dimensional scenes using electronically controllable pixel in a holographic array ( | 08-21-2008 |
20080198431 | Projection Device and Method For Holographic Reconstruction of Scenes - The invention relates to a projection device and a method for holographic reconstruction of scenes comprising a light modulator ( | 08-21-2008 |
20080212153 | Controllable Illumination Device - The invention relates to a controllable illumination device for an autostereoscopic or holographic display, which illumination device contains an illumination matrix of primary light sources having at least one luminous element per light source and a controllable light modulator (SLM) and a reproduction matrix. A computer-generated hologram (CGH) illuminated by the primary light sources ( | 09-04-2008 |
20080246753 | Method and Device for Tracking Sweet Spots - The invention relates to a method and device for tracking the sweet spots of a sweets spot unit for a transmissive electronic display. The aim of the invention is to improve the reproduction quality and the uniformity of illumination in displays of this type. The display contains a sweet spot unit consisting of an illumination matrix ( | 10-09-2008 |
20080252950 | Video Hologram and Device for Reconstructing Video Holograms for Large Objects - A video holographic display device operates so that the size of a reconstructed three dimensional scene is a function of the size of the hologram-bearing medium; the reconstructed three dimensional scene can then be anywhere within a volume defined by the hologram-bearing medium and a virtual observer window through which the reconstructed three dimensional scene must be viewed. This contrasts with conventional holograms, in which the size of the reconstructed scene is localised to a far smaller volume and is not a function of the size of the hologram-bearing medium at all. | 10-16-2008 |
20080278805 | Sweet Spot Unit For a Multi-User Display Device With an Expanded Viewing Zone - The invention relates to a sweet spot unit for multiple user display with an enlarged observation area, preferably for an electronic display for reproducing stereoscopic and/or monoscopic representation which are automatically oriented towards the eyes of different observers by means of a position finder and a tracking and image control system. A said sweet spot unit contains deviation means ( | 11-13-2008 |
20080315442 | Method and Apparatus for Replicating Microstructured Optical Masks - The invention relates to a method and an apparatus for replicating planar, thin-layered, and microstructured flat lens system and optical mask (LM) that are provided with such microstructured lens system which are hardened from a highly viscous transparent fluid on a supporting substrate plate (TP). The fluid is introduced between a plate-shaped master plate (M) and a movable supporting substrate plate and remains joined to said substrate plate after hardening. The inventive method is carried out in a non-rotational manner while the molding space is not delimited by sidewalls or similar in the direction of expansion of the fluid. The inventive flat lens systems or optical masks are embodied as lenticular arrays, field lenses, or Fresnel lenses. The final shape of the mask is homogeneous, has a geometrically accurate layer thickness, and is free from air pockets. The inventive method and apparatus allow for controlled replication at great geometrical accuracy and extremely good optical quality. | 12-25-2008 |
20090290203 | Method and Device for Computing Computer-Generated Video Holograms - The data defining an object to be holographically reconstructed is first arranged into a number of virtual section layers, each layer defining a two-dimensional object data sets, such that a video hologram data set can be calculated from some or all of these two-dimensional object data sets. The first step is to transform each two-dimensional object data set to a two-dimensional wave field distribution. This wave field distribution is calculated for a virtual observer window in a reference layer at a finite distance from the video hologram layer. Next, the calculated two-dimensional wave field distributions for the virtual observer window, for all two-dimensional object data sets of section layers, are added to define an aggregated observer window data set. Then, the aggregated observer window data set is transformed from the reference layer to the video hologram layer, to generate the video hologram data set for the computer-generated video hologram. | 11-26-2009 |
20090310197 | Reflective Optical System, Tracking System and Holographic Projection System and Method - The invention relates to an optical reflection system with a reflection element for reflecting reconstruction light waves, an entry-side focal point, from which the reconstruction light waves come when they hit the reflection element, and an exit-side focal point, to which the reconstruction light waves propagate after being reflected from the reflection element. The invention further relates to a tracking system and a holographic projection system with such optical reflection system, and a corresponding holographic projection method. In order to achieve with such an optical reflection system an aberration correction and a tracking of the visibility region and a reconstruction larger than with prior art devices, the optical reflection system according to this invention comprises a deflection element with optically controllable deflection properties and a deflection control means for optically controlling the deflection properties of the deflection element which controls the position of at least the exit-side focal point of the optical reflection system. | 12-17-2009 |
20090315983 | IMAGE DISPLAY DEVICE COMPRISING AN IMAGING MATRIX - The invention relates to an image display device comprising an imaging matrix, which consists of imaging elements which are arranged in a lateral manner, for example, lenticulars or a lens array, and a plurality of point elements which are disposed on a object plane and which are formed from the imaging elements in an observation chamber. In order to reduce imaging errors resulting in the image field curvature of the individual imaging elements of a large observation angle, compensation by a correction matrix, which contains a plurality of optical corrections elements, takes place. An optical correction element is associated with each individual optical imaging element. Said invention can be used, for example, in image or video display devices, such as autostereoscopic displays, multi-user-displays with sweet-spot-units and multi-view-displays, in order to image illuminating elements. The invention also relates to displays comprising a sweet-spot-unit, which can be switched for one or more observers into a two-dimensional mode and also in an autostereoscopic mode. | 12-24-2009 |
20100014136 | Holographic Projection System Using Micro-Mirrors for Light Modulation - The invention relates to a holographic projection system wherein light modulator means SLM with electromechanically moved micro-mirrors modulate a light wave front LW | 01-21-2010 |
20100027083 | COMPACT HOLOGRAPHIC DISPLAY DEVICE - A holographic display device comprises a first OLED array writing onto a first OASLM, the first OLED array and the first OASLM forming adjacent layers, and a second OLED array writing onto a second OASLM, the second OLED array and the second OASLM forming adjacent layers. The first and the second OASLMs encode a hologram and a holographic reconstruction is generated by the device when an array of read beams illuminates the first and second OASLMs and the first and second OASLMs are suitably controlled by the first and second OLED arrays. Advantages include that this device permits independent control of phase and amplitude, and the device lends itself to compactness. | 02-04-2010 |
20100045776 | Interface and Circuit Arrangement, in Particular for Holographic Encoding Units or Holographic Reproduction Devices - The invention relates to an interface and circuit arrangement, in particular for transmitting digital image data to at least one holographic encoding unit (HEU), which generates complex hologram values from image data containing depth information and/or encodes the pixel values for controlling at least one light modulator element of a holographic reproduction device. The invention is characterised in that the interface transmits the depth map of the image data and the colour map of said image data separately via transmission means (L | 02-25-2010 |
20100046049 | COMPACT HOLOGRAPHIC DISPLAY DEVICE - A holographic display device comprises an OLED array writing onto an OASLM, the OLED array and OASLM forming adjacent layers. The OASLM encodes a hologram and a holographic reconstruction is then generated by the device when an array of read beams illuminates the OASLM. The OASLM is suitably controlled by the OLED array. An advantage of the device is that it lends itself to compactness. | 02-25-2010 |
20100046050 | COMPACT HOLOGRAPHIC DISPLAY DEVICE - Holographic display device comprising a first EASLM and a second EASLM, the pair permitting independent modification of phase and amplitude, in which holographic reconstruction is visible through one or more virtual observer windows. An advantage is that an observer may view a holographic reconstruction through one or more virtual observer windows from a device housing a pair of EASLMs which permit independent modification of phase and amplitude. | 02-25-2010 |
20100067077 | Holographic Reconstruction System with Optical Wave Tracking Means - 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. | 03-18-2010 |
20100073744 | Method for Generating Video Holograms in Real Time by Means of Subholograms - 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. | 03-25-2010 |
20100097439 | MOBILE TELEPHONY SYSTEM COMPRISING HOLOGRAPHIC DISPLAY - A mobile telephony system comprising a calling party mobile telephone with an imaging system and a display. The imaging system is operable to capture an image of the calling party. The calling party mobile telephone sends an image of the calling party to a called party mobile telephone over a wireless link, and the called party mobile telephone locally generates a holographic reconstruction of the calling party using a holographic display that is encoded with a hologram. An advantage is that a mobile telephone call may be held in which one party views a holographic reconstruction of the other party. | 04-22-2010 |
20100103246 | Holographic Projection System with Optical Wave Tracking and with Means for Correcting the Holographic Reconstruction - 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. | 04-29-2010 |
20100118117 | 3D CONTENT GENERATION SYSTEM - 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. | 05-13-2010 |
20100149313 | Holographic Reconstruction system with a Tracking Device for the Reconstruction - A holographic reconstruction system having spatial light modulators, an eye finder and a position control orients a propagating spatially modulated light wave field toward at least one eye position of an observer's eye, thereby reconstructing a scene in a three-dimensional manner and tracking the same during a position change of the eye position. Through Unobstructed lateral and axial movement of the observer head to arbitrary eye positions in a tracking region is enabled. The use of additional, planar optical components, which bring about optical aberrations during a position change of observer eyes, are prevented. | 06-17-2010 |
20100149314 | Method for Rendering and Generating Color Video Holograms in Real Time - 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. | 06-17-2010 |
20100149610 | Method for Generating Video Holograms for a Holographic Display Device with Random Addressing - 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. | 06-17-2010 |
20100149617 | Light Modulator for Representing Complex-Valued Data - 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. | 06-17-2010 |
20100194854 | Holographic Reconstruction System with an Arrangement of Controllable Microcells - A holographic reconstruction system is disclosed for the three-dimensional reconstruction of object light spots of a scene, comprising spatial light modulation means which modulate interference-capable light waves of illumination means with at least one video hologram, and optical focussing means which focus the modulated light waves with the reconstructed object light spots for at least one eye position of the observer's eyes. An electro-optical deflection means controlled by a system controller focuses the modulated light wave with the reconstructed object light spots on at least one eye position and tracks them when the eye position changes. The electro-optical deflection means is a controllable optical diffraction grating with a variable surface relief structure consisting of separately controllable microcells. | 08-05-2010 |
20100214634 | Holographic Reconstruction System with an Optical Wave Tracking Means - A holographic reconstruction system is disclosed with spatial light modulation means, modulating interferable light waves from light sources with at least one video hologram, comprising optical focusing means, focusing the modulated light waves with the reconstructed object light points for at least one eye position for the eyes of observers and controllable electro-optical deflector means, which direct the focused modulated light waves with the reconstructed light points to at least one eye position in order to reduce the aberrations. The reconstruction system has the optical focusing means in a field of focusing elements, wherein each focusing element is provided with at least one interferable light source. The electro-optical deflector means lie in the light path of the interferable light waves after the optical focusing mean and have at least one field of deflector elements, which has at least one separately controllable electro-optical deflector element for each focusing element. | 08-26-2010 |
20100231999 | Dynamic Wavefront Shaping Unit - An optical unit for dynamically shaping a wavefront is disclosed, having light modulation cells disposed regularly in cell fields, and locally influencing partial light waves in a propagating light wavefront. Each cell field is connected to a cell controller separately adjusting the optical behavior of the light modulator cells. Serially-disposed fields, each having modulator cells, are located in the light path of the light wavefront. Cell control means adjust the modulator cells in a first cell field such that the modulator cells discretely implement a phase shift having a continuous phase value, and in a second cell field such that the modulator cells implement a prism function having a continuous directional value for the partial light waves. A focusing means for the emitted wavefront is also located in the light path of the optical unit, guiding the partial light waves at an output pupil of the optical unit. | 09-16-2010 |
20100284049 | Holographic Reconstruction System and Method with a Sequence of Visibility Regions - A holographic reconstruction system and method for the three-dimensional reconstruction of object light points of a scene is disclosed. The system includes spatial light modulation means which modulate light waves capable of interference with at least one video hologram, focusing means which focus the modulated light waves so that a viewer can view the reconstructed object light points of the scene from a visibility region that is thereby produced by focusing, and deflection means which position the visibility region by aligning the modulated light waves. The holographic reconstruction system includes deflection control means for controlling the deflection means to sequentially adjust the visibility region to different contiguous viewing positions, and light controlling means for switching the light waves in synchronicity with the deflection control means. | 11-11-2010 |
20110026089 | VIDEO HOLOGRAM AND DEVICE FOR RECONSTRUCTING VIDEO HOLOGRAMS - The invention relates to video holograms and devices for reconstructing video holograms, comprising an optical system having a light source, lens and the video hologram having cells arranged in a matrix or a regular pattern with at least one opening per cell, the phase or amplitude of said opening being controllable. The holographic video representations of expanded spatial objects can be achieved in a wide viewing area in real time using controllable displays, whereby the objects are either computer-generated or created by different means. The space-bandwidth product (SBP) of the hologram is thus reduced to a minimum and the periodicity interval of the Fourier spectrum is used as a viewing window on the inverse transformation plane, through which the object is visible in the preceding space. The mobility of the viewer(s) is achieved by tracking the viewing window. | 02-03-2011 |
20110149018 | HOLOGRAPHIC DISPLAY DEVICE COMPRISING MAGNETO-OPTICAL SPATIAL LIGHT MODULATOR - A holographic display device comprising at least one magneto-optical spatial light modulator (MOSLM). The holographic display device may comprise a first MOSLM and a second MOSLM, the first and second MOSLMs encoding a hologram and a holographic reconstruction being generated by the device. An advantage of the device is fast encoding of holograms. | 06-23-2011 |
20110304895 | METHOD OF COMPUTING A HOLOGRAM FOR RECONSTRUCTING AN OBJECT USING A DISPLAY DEVICE - A method of computing a hologram for reconstructing an object using a display device is provided. The display device enables a holographic reconstruction of the object. The display device comprises a light source and an optical system to illuminate a hologram-bearing medium being encodable with the hologram. The method comprises the steps of: (a) computing the hologram by determining the wavefronts at an approximate observer eye position that would be generated by a real version of the object to be reconstructed; and (b) encoding the computed hologram in the hologram-bearing medium. | 12-15-2011 |
20130265626 | METHOD OF COMPUTING A HOLOGRAM FOR RECONSTRUCTING AN OBJECT USING A DISPLAY DEVICE - A method of computing a hologram for reconstructing an object using a display device. The display device enables a holographic reconstruction of the object. The display device includes a light source and an optical system to illuminate a hologram-bearing medium being encodable with the hologram. The method includes the steps of: (a) computing the hologram by determining the wavefronts at an approximate observer eye position that would be generated by a real version of the object to be reconstructed; and (b) encoding the computed hologram in the hologram-bearing medium. | 10-10-2013 |
20150036199 | METHOD OF COMPUTING A HOLOGRAM - A method of computing a hologram by determining the wavefronts at the approximate observer eye position that would be generated by a real version of an object to be reconstructed. In normal computer generated holograms, one determines the wavefronts needed to reconstruct an object; this is not done directly in the present invention. Instead, one determines the wavefronts at an observer window that would be generated by a real object located at the same position of the reconstructed object. One can then back-transforms these wavefronts to the hologram to determine how the hologram needs to be encoded to generate these wavefronts. A suitably encoded hologram can then generate a reconstruction of the three-dimensional scene that can be observed by placing one's eyes at the plane of the observer window and looking through the observer window. | 02-05-2015 |