摘要:
The invention relates to a method for producing a volume hologram having at least one 1st area in a 1st colour and at least one 2nd area in a 2nd colour, having the steps of: a) providing a volume hologram layer comprising a photopolymer; b) arranging a master with a surface structure on the volume hologram layer; c) exposing the master to coherent light, wherein light that strikes at least one 1st subarea of the surface of the master is diffracted or reflected in the direction of the at least one 1st area of the volume hologram layer and light that strikes at least one 2nd subarea of the surface of the master is diffracted or reflected in the direction of the at least one 2nd area of the volume hologram, and wherein the light diffracted or reflected by the 1st and 2nd subareas differs in at least one optical property.
摘要:
This invention relates to electronic devices incorporating a holographic projector. A holographic projection module for a consumer electronic device, the holographic projection module comprising: at least one substantially monochromatic light source (12); a spatial light modulator (24) (SLM) to phase modulate light (22) from said light source to provide a phase hologram for generating a two-dimensional displayed image (14); projection optics to project said phase modulated light to form said two-dimensional displayed image; wherein said projection optics comprise an optical system (26) configured to demagnify a conventional, non-holographic image, to increase the divergence of said light forming said displayed image,- and a digital signal processor (100) to generate data for a plurality of temporal holographic sub frames from a desired image for display, for modulating said SLM, such that temporal averaging amongst the subframes reduces the perceived level of noise, in said displayed image when images corresponding to the subframes are displayed successively and sufficiently fast that they are integrated together in the eye of a human observer.
摘要:
A method of displaying a video image comprises receiving sequential image frames at a processor. Each image frame is processed to obtain a kinoform. A programmable diffractive element such as an SLM (206) represents the sequence of kinoforms allowing reproduction (208) of the image using a suitable illumination beam (200, 202).
摘要:
A method of producing a phase-only computer generated hologram for a pixellated Spatial Light Modulator device (200) supporting a discrete number of modulation levels and having an integrated layer of liquid crystal material above a silicon circuit, the method comprising: determining punctuated replay coordinates in a Fourier transform plane (202) of the SLM (200); using said coordinates for calculating the size in pixels of a base cell; evaluating a holographic base cell pattern using a phase quantisation procedure and replicating said base cell in the plane of the said hologram device 200) until the entire aperture of the hologram device is filled.
摘要:
The present invention provides a computer generated hologram (100) including a plurality of cells (110a to 110d) which form a light intensity distribution (LI) on a predetermined plane (PS), the plurality of cells including a plurality of first cells (110a to 110d) including isotropic media (112) and anisotropic media (114), and a plurality of second cells (110a) including anisotropic media alone, wherein the plurality of cells change a phase of incident light which impinges on each of the plurality of cells to form a phase distribution including N (N ≥ 2) for each of a wavefront of a linearly polarized light component in a first direction and a wavefront of a linearly polarized light component in a second direction perpendicular to the first direction.
摘要:
The present invention provides a computer generated hologram (100) which forms a light intensity distribution on a predetermined plane (PS) by giving a phase distribution to a wavefront of incident light, comprising an anisotropic layer (114) whose refractive index with respect to linearly polarized light in a first direction is different from a refractive index of the anisotropic layer with respect to linearly polarized light in a second direction perpendicular to the linearly polarized light in the first direction, and an isotropic layer (112) whose refractive index with respect to the linearly polarized light in the first direction is equal to a refractive index of the isotropic layer with respect to the linearly polarized light in the second direction.
摘要:
A holographic display has a pixellated (101, 102, 103) hologram display device (100) with a predetermined resolution and a pixellated (121 - 126) phase mask (120) arranged such that holograms displayed on the SLM (100) are viewed through the phase mask, wherein the phase mask has a resolution higher than the predetermined resolution.
摘要:
In einem computer-generierten Hologramm (13) (CGH) wird unter Binärisierung mit Hilfe des im Prinzip nach dem Stand der Technik bekannten Fehlerdiffusionsverfahrens im Fourier-Spektrum des CGH mindestens eine Nullstelle des Binärisierungsrauschens erzeugt, die im Spektrum der Nutzwelle liegt bzw. durch dieses verläuft. Durch Filterung (15) in der Fourier-Ebene des CGH kann das Nutzlicht vom Rauschen getrennt und eine rauschfreie Nutzwelle (11) erzeugt werden, insbesondere zur Erzeugung eines holographisch-optischen Elementes (12).