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.

A hologram image display apparatus includes an illumination optical system that emits an illumination light beam wavefront and a spatial light modulator having a light modulation area that converts the illumination light beam wavefront by diffraction to a display light beam wavefront and displays a virtual image. The spatial light modulator forms the display light beam wavefront by modulating the illumination light beam wavefront so that at least a portion of a regular light ray group configuring the display light beam wavefront is a light ray group with a diffraction angle having an absolute value greater than the ±first-order diffraction angle by the spatial light modulator, and another portion of the regular light ray group is a light ray group with a diffraction angle having an absolute value of the ±first-order diffraction angle or less by 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.

A three-dimensional holographic display device includes a light emitting diode (LED) array including a plurality of light sources controlled to sequentially output light according to a preset pattern, a lens configured to refract light incident from the LED array, a spatial light modulator (SLM) configured to modulate light incident from the lens, and a processor configured to generate a plurality of holographic signals each comprising depth information adjusted according to an arrangement location of each of the plurality of light sources, and for each of the plurality of light sources, control the SLM to modulate the light based on a holographic signal corresponding to the light source.

The invention relates to a method for generating holograms for encoding in a spatial light modulation device for a holographic display for representing a two- and/or three-dimensional scene. The two- and/or three-dimensional scene is decomposed into object points and encoded in a hologram, which is subdivided into subholograms, in the spatial light modulation device. The object points of the scene are encoded into encoding regions on the spatial light modulation device. A size and/or shape of the encoding region is selected in relation to a size and/or shape of a subhologram, assigned to the encoding region, in such a way that crosstalk of higher diffraction orders in a virtual visibility region is reduced.

A liquid crystal spatial light modulator and a three-dimensional display device are provided. The liquid crystal spatial light modulator includes a base substrate and a plurality of pixel units arranged in an array. Each pixel unit includes one pixel electrode, and the pixel electrode is located on the base substrate. Each pixel unit includes a light shielding structure, and the light shielding structure is configured to divide the each pixel unit into a plurality of pixel regions.

A display device for representing two-dimensional and/or three-dimensional objects or scenes, having at least one spatial light modulation device having pixels for modulating light, at least one optical system, and at least one light guiding device. Light beams originating from the individual pixels of the spatial light modulation device are incident on the at least one light guiding device at different angles on average in relation to the surface of the at least one light guiding device and can be coupled therein, whereby a coupling angular spectrum is definable. The light beams propagating in the at least one light guiding device can be coupled out of the at least one light guiding device at different angles on average in relation to an observer region, whereby a decoupling angular spectrum is definable. The decoupling angular spectrum is enlarged in comparison to the coupling angular spectrum.

A holographic display apparatus and a holographic display method are provided. The holographic display apparatus determines a representative depth from 3D image data; calculates a computer generated hologram (CGH) corresponding to the representative depth on the 3D image data; obtains the modulated CGH by modulating a phase of the CGH to increase an eye box; modulates a light according to the modulated CGH and generates a hologram image; and forms the generated hologram image at the representative depth.

A method and system for reducing the effects of glare in a system comprising a picture generating unit, such as a holographic projector. The system may be a head-up display (HUD), which is configured to display a picture to a viewer, without requiring the user to look away from their usual viewpoint. The HUD system may be comprised within a vehicle. The glare in the system may be caused by light being incident on a surface comprising a screen or a window, through which the user looks at their usual viewpoint. The surface may comprise a windshield in a vehicle. The light that causes the glare may be ambient light. The method and system are provided for reducing the effects of glare in a system that comprises a waveguide in conjunction with the picture generating unit. The waveguide may be operable to act as an exit pupil expander.

A diffractive structure arranged to spatially modulate light transformable by a viewing system into a target image. The diffractive structure is configured to generate a plurality of discrete light patterns. Each light pattern corresponds to a different part of the target image. The shape of each discrete light pattern substantially corresponds to the shape of an entrance aperture of the viewing system.