An augmented reality display device (such as a head mounted device) includes a partially transparent and partially reflective lens, a laser light source, a radio frequency source, a display controller, an acousto-optical modulator, and a microelectromechanical (MEMS) device. The laser light source generates light. The radio frequency (RF) source generates a RF signal. The display controller generates a synchronization signal. The acousto-optical modulator receives at least a portion of the light, modulates the light based on the RF signal, and provides modulated light. The MEMS device receives the synchronization signal from the display controller and reflects the modulated light towards the partially transparent and partially reflective lens. The MEMS device determines a direction in which the modulated light reflects based on the synchronization signal and the partially transparent and partially reflective lens reflecting the modulated laser light towards an eye of a user of the augmented realty display device.

The invention relates to a display device for holographic reconstruction. The display device comprises a spatial light modulator device having combined phase modulating pixels and amplitude modulating pixels, an illumination unit generating sufficiently coherent light and arranged to illuminate of the spatial light modulator device and a reflection plane. The device being arranged such that light enters the spatial light modulator device and passes both the phase modulating pixel and the amplitude modulating pixel of the spatial light modulator device. The light is reflected by the reflection plane in between.

The present disclosure relates to a holographic display apparatus and a method for display by using the same. The holographic display apparatus comprises: a display device, wherein the display device comprises pixels, the pixel contains a light-emitting component, and in each pixel, an amplitude of a light wave emitted from the light-emitting component is independently adjustable; and a phase-controlling plate, wherein the phase-controlling plate is located at a position between the light-emitting component and a light emergence surface of the display apparatus, so that a phase of the light wave emitted from the light-emitting component in each pixel, when the light wave arrives the light emergence surface, is independently adjustable by the phase-controlling plate.

A laser fabrication method and a laser fabrication system. The laser fabrication system includes an ultrafast laser source configured to output a laser beam; and a digital micromirror device (DMD), configured to receive, shape, and scan the laser beam, wherein more than one binary holograms are synthesized to form a scanning hologram applied to the DMD. The shaped laser beam, containing one or multiple focal points, leaving the DMD, are focused to the sample for fast laser fabrication.

According to the present invention, by providing a hologram displaying apparatus including a light source configured to output a plurality of lights of different wavelengths in a first direction, a generator configured to generate a plurality of color holograms of different wavelengths using the plurality of light, and output the plurality of color holograms in the first direction, a filter configured to filter an effective hologram which is an element of an effective band of the plurality of color holograms in the first direction, and a display configured to transmit the effective hologram in the first direction and display the effective hologram in space in the first direction, it is possible to effectively filter an effective band of a certain diffraction order of each color hologram forming a composing hologram.

A system contains a light source for generating a plane wave light beam. A MicroElectroMechanical (MEM) system includes an array of micro-mirrors for generating a light beam having a plurality of orbital angular momentum modes multiplexed together within the light beam responsive to the plane wave light beam and control signals for controlling the array of micro-mirrors. A controller generates the control signals to dynamically control a position of each of a plurality of micro-mirrors of the array of micro-mirrors to apply the plurality of orbital angular momentum modes on to the light beam. The controller controls the position of the plurality of micro-mirrors to dynamically generate a plurality of holograms for dynamically applying the plurality orbital angular momentum modes to the plane wave light beam and to dynamically encode a phase and amplitude of the light beam responsive to the control signals.

Apparatus for generating an optical pattern from image points in an image plane, including: a control unit; a micro-mirror array; an illumination unit controllable by the control unit; a focusing unit; the control unit being configured to control one or several micro-mirror groups formed of several micro-mirrors of the multitude of micro-mirrors such that the centroid beams reflected at the micro-mirrors of one of the micro-mirror groups meet in the image plane, and such that optical path lengths of the centroid beams reflected at the micro-mirrors of the respective micro-mirror group are equal from the illumination unit up to the image plane or differ by an integer multiple of a wavelength of the light beams in order to generate an image point of the image points in such a way.

A method of forming a rarefied hologram for video imaging and 3D lithography by using an MEMS/SLM with a plurality of pixels on the surface at a fixed distance from the retina of the viewer' eye. The method consists of providing an initial desired image, which has to be holographically reproduced by the MEMS/SLM as a remote virtual 3D image visible by the viewer's eye. The desired image is coded in a special manner and mapped by encoding and calculating only a part of the initial desired image. The operations of the pixels are controlled in accordance with the code for generation of the holographic pattern. Since only a part of a holographic pattern of the image is encoded and calculated, it becomes possible to reduce the calculation time and decrease parasitic light scattering.

A spatial light modulator and a method for displaying a computer generated hologram are disclosed. The spatial light modulator includes a plurality of MEMS units arranged in an array, each of the MEMS units corresponds to a pixel of a computer generated hologram and includes a sensing device, a light shielding portion and a driving device. The sensing device is configured for receiving position information that is obtained through Roman encoding a pixel corresponding to an MEMS unit including the sensing device and the position information is transmitted to the driving device by the sensing device. The driving device is configured for controlling the light shielding portion to move to a position corresponding to the position information in response to the received position information of the light shielding portion when the present frame is displayed.

Disclosed is a digital color holographic display device using tiling, including: a plurality of digital color hologram generating units generating digital color holograms, respectively; and a tiling unit spatially arranging the digital color holograms of the plurality of digital color hologram generating units through an optical tiling method so as not to overlap with each other.