Abstract:
PROBLEM TO BE SOLVED: To provide a spatial optical modulator capable of modulating the phase of incident light according to an applied voltage.SOLUTION: A spatial optical modulator is constituted in the form of a periodic structure of polymer diffraction grating layers PMG which are arranged at substantially equal distances and intermediate spaces LCS which are between polymer diffraction grating layers PMG and filled with an active optical medium, and electrodes PE, GE which affect the refractive index of the active optical medium with an electric field are formed on a plane forming a boundary of the periodic diffraction grating structure SVG, and the electrodes PE have pixel-forming arrays in regular pattern and can be driven with voltages independently of each other. When light EL emitted from at least one light source impinges on the spatial optical modulator, a light part GL deflected because of Bragg diffraction is a predetermined value smaller than a light part DL transmitted without being deflected, and when a driving voltage V changes, the ratio of the light part GL deflected and a light part DL transmitted without being deflected has substantially no change.
Abstract:
A holographic reconstruction system is disclosed for the three-dimensional reconstruction of object light spots of a scene, comprising spatial light modulation elements which modulate interference-capable light waves of illumination means with at least one video hologram, and optical focussing elements 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 element 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 element is a controllable optical diffraction grating with a variable surface relief structure consisting of separately controllable microcells.
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 is the other Fourier transformation plane.
Abstract:
The invention relates to a method for the multimodal representation of image contents on a display unit for video holograms. Said unit comprises at least one or several light sources (LS), an optical system (L), and a spatial light modulator SLM (S) with hologram contents. According to the inventive method, the unit directs the wavefront that an object would emit to the associated eye positions (EP) such that the viewer sees the reconstruction of the scene and different views are presented to the eyes by means of temporal or spatial multiplexing in order to generate the stereo effect. The inventive method is characterized in that the light of the zero order of diffraction is directed to the eye positions (EP) for a holographic representation in a first mode, whereby the viewer sees the reconstructed scene (3D-S), while the non-diffracted light is directed to the eye positions for a direct representation in a second mode, whereby the viewer sees an autostereoscopic and/or a 2D representation (3D-2D) on the SLM. The invention also relates to display units for implementing said method.
Abstract:
Disclosed is a color filter with parallel, vertical color strips of the RGB base colors associated with the image separating means, the color strips repeating horizontally within the color filter in periodic fashion. The light modulator contains a sequence of two registered holograms for each base color interlaced into six pixel columns for a left observer eye and for a right observer eye, and the sequence is repeated horizontally in periodic fashion. The periods of the color filter and the hologram are arranged relative to one another with the same degree of expansion, with a color strip and at least two pixel columns with holograms of the base color of the color strip are associated with a separating element.