A holographic display includes a pixel array including one or more pixels, a holographic data source, a drive array, and a light source. Each pixel includes a phase-modulating structure and an amplitude-modulating structure. The holographic data source is configured to supply a holographic drive signal. The holographic drive signal includes, for each pixel in each of a plurality of time-varying holographic image frames, a phase component defining phase modulation for the pixel and an amplitude component defining amplitude modulation for the pixel. The drive array is configured to, for each pixel in each holographic image frame, modulate the phase-modulating structure according to the phase component and modulate the amplitude-modulating structure according to the amplitude component. The light source is configured to output coherent light to illuminate the one or more pixels of the pixel array.

A holographic display device and a display method thereof. The holographic display device comprises a backlight module and two liquid crystal modules. The backlight module is used for providing coherent light; the two liquid crystal modules are located on the light exit side of the backlight module, and the two liquid crystal modules are stacked; one of the two liquid crystal modules is used for performing amplitude modulation on incident light, and the other one is used for performing phase modulation on incident light. In this way, the complex amplitude of exit light is adjusted, and the quality of a reconstructed image is improved.

A complex light modulator including a first polarization plate, a second polarization plate provided, an amplitude modulator provided between the first polarization plate and the second polarization plate, a phase modulator provided between the amplitude modulator and the second polarization plate, and color filters provided between the amplitude modulator and the phase modulator.

A holographic display apparatus includes: a light source; a spatial light modulator configured to modulate light from the light source according to an image to be displayed on an object plane; and a processor configured to generate a computer generated hologram (CGH) in which a phase value of hologram data to be displayed on a reference plane of the spatial light modulator is 0, the processor being configured to apply a light modulation signal based on the CGH to the spatial light modulator.

There is provided a head-up display comprising a glare trap; and an eye-box, wherein the head-up display comprises: a picture generating unit; an optical system comprising at least one mirror and a beam splitter, wherein the beam splitter is substantially reflective to infrared light and transmissive to visible light; an infrared image capture device disposed within a volume of the optical system; and a plurality of infrared light sources packaged with the glare trap, wherein the infrared light sources are arranged to illuminate the eye-box.

A holographic display system, a holographic display method and an electronic device are provided. The holographic display system includes a backlight module configured to emit a backlight beam, a spatial light modulator configured to perform phase and amplitude modulations on the backlight beam, and a plurality of liquid crystal grating modules that are sequentially arranged in a first direction. Based on a polarization direction of incident light, a liquid crystal grating module is capable of changing or maintaining a propagation direction of the incident light. A first optical rotator disposed on a light-incident side of the liquid crystal grating module is capable of rotating the polarization direction of the incident light, to make at least one liquid crystal grating module change the propagation direction of the incident light, and at least one liquid crystal grating module do not change the propagation direction of the incident light within a preset duration.

Provided are an illumination apparatus that allows a reduction in thickness and a display apparatus that uses the illumination apparatus. The illumination apparatus includes a laminated illumination portion formed by layering illumination portions that each emit illumination light as a plane wave with a different wavelength. The illumination portions include light sources that emit light of a predetermined wavelength, optical waveguides that propagate the light emitted from the light sources, and gratings that diffract the light propagating through the optical waveguides and emit the light as the illumination light.

A holographic display device and a display method thereof. The holographic display device comprises a backlight module and two liquid crystal modules. The backlight module is used for providing coherent light; the two liquid crystal modules are located on the light exit side of the backlight module, and the two liquid crystal modules are stacked; one of the two liquid crystal modules is used for performing amplitude modulation on incident light, and the other one is used for performing phase modulation on incident light. In this way, the complex amplitude of exit light is adjusted, and the quality of a reconstructed image is improved.

A holographic display includes an illuminator, a spatial light modulator (SLM) coupled to the illuminator, a beam redirector and an ocular lens coupled to the SLM. A controller is operably coupled to the SLM and the beam redirector and configured to provide exit pupils at eyebox locations where a holographic image may be observed. The exit pupils provided in a time-sequential manner, forming a grid of exit pupils/eyebox locations. An eye tracking system may be used to center the grid around the current eye pupil position, to provide a larger overall eyebox for viewing the holographically generated image.

A holographic display includes an illuminator, a spatial light modulator (SLM) coupled to the illuminator, and an ocular lens coupled to the SLM. The illuminator provides a wide-area illuminating light beam to illuminate the SLM with a spatially homogeneous beam of light. The illuminator may include a slab waveguide with an evanescent out-coupler, or a beam expander based on a diffraction grating with an oblique angle of incidence and a near-normal angle of diffraction of the illuminating light. A low-pass spatial filter may be provided to filter out higher diffraction orders of the illuminating light diffracted on the SLM.