A holographic display apparatus for providing an expanded viewing window includes a spatial filter configured to separate a plurality of holographic images generated by the hologram pattern displayed on the spatial light modulator from a plurality of lattice spots generated by a physical structure of the spatial light modulator. The spatial filter includes a plurality of color filters or a plurality of dichroic mirrors separating a first color image, a second color image, and a third color image from a first color lattice spot, a second color lattice spot, and a third color lattice spot.

A holographic display device is provided. The holographic display device includes a spatial light modulator for representing a partial complex domain and reproducing a hologram by diffracting light, and a processor for controlling the spatial light modulator. The processor controls the spatial light modulator by employing an algorithm for calculating hologram information according to the representation of the partial complex domain of the spatial light modulator.

Provided is a holographic display apparatus including a light source configured to emit light, a spatial light modulator configured to form a hologram pattern to modulate the light incident thereon and reproduce a hologram image, the spatial light modulator including a plurality of display pixels that are arranged two-dimensionally, and an optical element provided opposite a light incidence surface of the spatial light modulator or a light exit surface of the spatial light modulator, the optical element including an array of a plurality of light transmission patterns that are arranged irregularly.

The invention relates to a holographic display device for representing a two-dimensional and/or three-dimensional scene. The holographic display device comprises at least one spatial light modulator device and an optical component. The at least one spatial light modulator device is provided in order to reconstruct the scene and in order to generate at least one virtual visibility region in an observer plane. The optical component is configured with at least two regions that have a different transparency to one another, the value of the transparency respectively lying between 0 and 1. Furthermore, the optical component is arranged in the display device in such a way that it provides filtering, to be carried out at least partially, of a diffraction order spot in at least one diffraction order inside the virtual visibility region.

An optical image generation system including: a spatial light modulator (SLM) configured to receive an input collimated laser beam and modulate the wavefront of the laser beam; one or more optical elements configured to project the modulated laser beam onto a focal plane; a first mirror and a second mirror situated at the focal plane, an edge of the first mirror being adjacent to an edge of the second mirror, the first mirror reflects a first portion of the modulated laser beam in a first direction, the second mirror reflects a second portion of the modulated laser beam in a second direction; and an objective lens projects the first and second portions into a combined image; wherein the zeroth order diffraction is block or suppressed at the center of the focal plane.

The present disclosure provides methods and systems for the three-dimensional (3D) printing of 3D objects. Methods and systems provided herein may comprise 3D holographic lithography which may enable the 3D printing of various shapes. Methods and systems provided herein may enable high efficiency 3D holographic printing and may avoid, for example, problems zero-order defects. Methods and systems provided herein comprise methods for printing 3D objects with reduced or minimal inconsistency.

A three-dimensional (3D) holographic display system includes a projector that generates an image with a form of spatially varying modulation on a light beam; holographic processor that performs a holographic method on the image generated by the projector; and memory device that stores holographic data generated in a process of performing the holographic method by the holographic processor. An amplitude of a light field is adaptively replaced by the holographic processor according to significance of respective areas of the image.

A holographic head-up display device includes: a light source portion that emits coherent light; an optical modulation portion that modulates the coherent light; a relay optical system that focuses the modulated light; a filter mirror that includes a reflection area disposed at a focal position of the relay optical system and reflecting light incident through the relay optical system and an absorption area disposed at the periphery of the reflection area and absorbing light incident through the relay optical system; and a transflective mirror that partially transmits and partially reflects light reflected by the filter mirror.

A holographic imaging system may include an optical source configured to output a source beam and a splitter configured to split the source beam into a reference beam and an object beam that may be incident on a target to form a scattered object beam. The system may also include a combiner configured to combine the filtered scattered object beam with the reference beam to form an interference beam, an imaging array configured to receive the interference beam and generate frames of raw holographic data based on measurements of the interference beam over time, and an image data processor. The image data processor may be configured to receive the frames of raw holographic data from the imaging array, remove data components within the frames that are associated with the particle motion having a motion frequency that is less than a movement frequency threshold to form conditioned raw holographic data, and generate an image based on the conditioned raw holographic data.

Provided are a method of displaying a digital holographic image and a digital hologram display apparatus, the method including generating and converting a digital hologram, recording the digital hologram in a spatial light modulator, radiating coherent parallel light to the spatial light modulator, removing an aliasing noise image, and implementing a reconstructed image reconstructed by the spatial light modulator.