88results about "Substrate with hologram" patented technology

Improvements to gratings for use in waveguides and methods of producing them are described herein. Deep surface relief gratings (SRGs) may offer many advantages over conventional SRGs, an important one being a higher S-diffraction efficiency. In one embodiment, deep SRGs can be implemented as polymer surface relief gratings or evacuated periodic structures (EPSs). EPSs can be formed by first recording a holographic polymer dispersed liquid crystal (HPDLC) periodic structure. Removing the liquid crystal from the cured periodic structure provides a polymer surface relief grating. Polymer surface relief gratings have many applications including for use in waveguide-based displays.

Different examples relate to techniques in order to actively or passively stabilize the temperature of a holographic optical element. To this end, heat-conducting elements, e.g. silver nanowires or carbon nanotubes, are provided.

Herein is described a method and apparatus for testing and / or manufacturing holograms. In particular, there is provided a method of manufacturing and / or testing holograms on a flat or a substantially flat substrate or on a cylindrical drum the method comprising the steps of: generating a target holographic optical element (HOE), which is based on input geometries and input system parameters; generating digital master printer control files and testing pass / fail criteria; printing a master hologram; testing the master hologram, and if the master hologram passes the testing criteria: generating a first witness replica from the master hologram; testing the replica hologram, and if the replica hologram passes the testing criteria: using the master and / or replica hologram to mass manufacture replica copies onto a curved substrate.

A light guide plate for image display can display clear images even when a resin base is used. The Sight guide plate configured for image display may include a first resin base and a hologram layer. The first resin base may have an MC value of 0.120 or less, obtained by evaluation using shadow contrast, according to expression (1):MC=Lmax-LminLmax+Lmin,(1)wherein Lmax is a maximum value of brightness from a brightness distribution, Lmin is a minimum value of the lightness from the brightness distribution, and MC is an MC value that objectively represents a magnitude of a dip in low brightness portions in the brightness distribution.

A method for storing data in a holographic medium is provided. The method comprises recording a plurality of holograms in one or more at least partially overlapping regions in a holographic medium. The data is stored in a combination of the plurality of holograms. A system for implementing the method is also provided.

The invention relates to a method for actively optimizing a playback configuration of a virtual retinal display (16a-d) comprising a light projector (10a-d) and a holographic combiner (12a-d) with at least one holographic-optical element (14a-d). It is proposed that in at least one process step (52a-d) of the process, one or more beam parameters of a light signal (18a-d) emitted by the light projector (10a-d) and / or one or more holographic reconstruction parameters of the holographic combiner (12a-d), in particular during operation of the virtual retinal display (16a-d), are actively modified with the aim of optimizing a hologram efficiency of the holographic-optical element (14a-d), in particular optimizing a hologram-side angular and / or wavelength bandwidth with which a hologram target efficiency can be achieved.

A display device comprises a spatial light modulator (hologram) 404, a substrate 402, and an attachment material (Aluminium Nitride adhesive) 430 for mounting the spatial light modulator on the substr

A method of preparing a glazing, comprising: stacking a first glass sheet, a first interlayer, a photopolymer film, a second interlayer, and a second glass sheet to provide a lamination stack; deairing the lamination stack; autoclaving the lamination stack to provide a laminated glazing; applying a reactive light to the photopolymer film in the laminated glazing, wherein reactive light is applied to the laminated glazing through a master holographic film; and bleaching the laminated glazing such that the photopolymer film is no longer reactive to light exposure.

Optical article (200) comprising at least: - a substrate (201), and - a holographic waveguide (202) covering at least part of the substrate (201) and comprising : - two main surfaces (203, 204), at least one of them conforming to a surface (201a) of the substrate (201), and - at least first and second zones (Z1, Z2) that are configured so that light incoming on one of the first and second zones (Z1; Z2) is at least partially guided towards the other of said first and second zones (Z2; Z1).

The present invention relates to a method for producing a substrate coated with a photopolymer film, wherein the photopolymer film is suitable in a partial region of its total surface to form a holographic optical element (HOE). The product of the process can be used in laminated glass for building glazing or in vehicle windows.

Methods for producing a security or value document (11), - in which at least one upper layer (3) and at least one lower layer (5) are combined to form a document body (6), - in which at least one upper layer (3) forms a top side and at least one lower layer (5) forms a bottom side of the document body (6), - in which a window (12) is provided in the document body (6) in which the document body (6) is transparent to light of a wavelength between the top and bottom, or in which a window section (18) is provided in at least one upper or at least one lower layer (3, 5), - in which a security hologram (16) is positioned between the top and bottom of the document body (6) and is associated with the window (12) or window section (18), - in which at least one cutout (14) is made in at least one inner layer (4) which is arranged between at least one upper and at least one lower layer (3, 5) in the document body (6), - in which a security hologram (16) is punched out with a punching tool (26, 32) with a format which corresponds to the size of the punching out (14) of the at least one inner layer (4), - in which the die-cut format of the security hologram (16) is inserted into the die-cut (14) of at least one inner layer (4), and - in which the at least one inner layer (4) with the security hologram (16) received in the die-cut (14) is supplied to the at least one upper and / or the at least one lower layer (3, 5), and - in which the at least one inner layer (3) with the security hologram (16) inserted in the die-cut (14) and the at least one upper layer (3) and the at least one lower layer (5) are joined together and laminated together, characterized in that - that a track material with several consecutive security holograms (16) is provided, and - that a transmission hologram is incorporated as a security hologram (16) into the document body (6) with a window section (18) that allows light to pass through from the top to the bottom to form the window (12).

Laminated pane (100), at least comprising a first pane (1), a second pane (2) and a stack of layers arranged in between, at least comprising the following layers in the order from the first pane (1) to the second pane (2): a first thermoplastic intermediate layer (3), a separating layer (5), a photopolymer layer (4) with at least one holographic element, a carrier layer (7) and a second thermoplastic intermediate layer (6), wherein - the photopolymer layer (4) has a thickness of 5 µm to 50 µm, - the carrier layer (7) contains polyethylene terephthalate (PET), polyethylene (PE), polymethyl methacrylate (PMMA), polycarbonate (PC), polyamide (PA), polyvinyl chloride (PVC) and / or cellulose triacetate (TAC) and has a thickness of 20 µm to 100 µm, wherein the carrier layer (7) is arranged directly adjacent to the photopolymer layer (4), and - the separating layer (5) contains polyethylene (PE), polyvinyl chloride (PVC) and / or polymethyl methacrylate (PMMA) and has a thickness of 10 µm to 300 µm.

The present disclosure relates to an optical element intended to be worn in front of the eye of a wearer. This optical element has two main surfaces and comprises at least one holographic diffusing element having a diffusing property resulting from a spatial variation of the refractive index of said holographic diffusing element. This spatial variation of the refractive index is greater than 0.001 at at least one given wavelength over a distance of less than 30 pm. The present disclosure also includes an optical equipment comprising such an optical element and a method for recording a holographic medium onto an optical lens.

Methods for recording and reproducing holograms include recording a hologram in a thresholded opto-magnetic medium by producing a collimated recording beam with a pulsed laser. The intensity of the recording beam is selectively modulated by passage through a modulator and spatially shaped by passage through a shaping element. The recording beam is made convergent by passage through an aspheric lens and is deflected bidirectionally with a MEMS mirror that is in operative connection with the modulator. Multiple disposed locations on a surface of the medium are exposed to a constriction of the convergent shaped beam causing a change in the medium. The hologram is reconstructed by illuminating the medium with a collimated laser beam and focusing light with a lens onto a detection matrix.

An optical master is created by using a nanoimprint alignment layer to pattern a liquid crystal (LC) layer. The nanoimprint alignment layer and the LC layer constitute the optical master. The optical master is positioned above a photoalignment layer. The optical master is illuminated and light propagating through the nanoimprinted alignment layer and the LC layer is diffracted and subsequently strikes the photo-alignment layer. The incident diffracted light causes the pattern in the LC layer to be transferred to the photo-alignment layer. A second LC layer is deposited onto the patterned photo-alignment layer, which subsequently is used to align the molecules of the second LC layer. The second LC layer in the patterned photo-alignment layer may be utilized as a replica optical master or as a diffractive optical element for directing light in optical devices such as augmented reality display devices.

Method for manufacturing a component (6) with a hologram (5), wherein during the manufacturing process of the component (6) a form matrix (1) and a tool matrix (2) having a hologram negative (4) act on the component (6) in a manufacturing tool and the hologram (5) is imprinted in a manufacturing process-integrated manner during a manufacturing step of the component by the action of the manufacturing tool on the component (6), wherein the tool die (2) is designed as an insert in the form die (1) of the manufacturing tool and where the manufacturing tool is an injection mold, thermoforming tool or RTM tool, and wherein the tool die (2) is in direct contact with a surface of the component (6) during a residence time in which a molding compound hardens to form the component, and the hologram (5) of the tool die (2) is transferred to the component (6).

A spectacle lens (100) comprises a transparent substrate (101) and at least one HOE-capable polymer layer (102, 112) arranged on the transparent substrate (101). The at least one HOE-capable polymer layer (102, 112) is suitable for forming a holographic optical element (900).

A laminated pane includes first and second panes, a layer stack arranged therebetween including a first thermoplastic intermediate layer, a separating layer, a photopolymer layer with at least one holographic element, a carrier layer, and a second thermoplastic intermediate layer, wherein the photopolymer layer has a thickness of 5 μm to 50 μm, the carrier layer contains polyethylene terephthalate (PET), polyethylene (PE), polymethyl methacrylate (PMMA), polycarbonate (PC), polyamide (PA), polyvinyl chloride (PVC), and / or cellulose triacetate (TAC) and has a thickness of 20 μm to 100 μm, wherein the carrier layer is arranged directly adjacent the photopolymer layer, and the separating layer contains polyethylene (PE), polyvinyl chloride (PVC), and / or polymethyl methacrylate (PMMA) and has a thickness of 10 μm to 300 μm.

A method for producing a curved substrate panel with a hologram includes producing a curved substrate panel from plastic by forming, injection moulding or injection-compression molding between a first mold half, which defines a predetermined desired geometry of a substrate surface, and a second mold half removing the first mold half from the second mold half and applying a holographic master to a surface of the first mold half, or of a further mold half fixing the first mold half or further mold half on the second mold half such that an empty gap of a predetermined constant thickness remains between the holographic master and the substrate surface, and filling this gap with a hologram-receiving material; and exposing the hologram-receiving layer formed between the substrate surface and the holographic master with a coherent light for forming a hologram defined by the holographic master.

A method of producing an optoelectronic component (10, 20, 30, 40, 50, 60) comprises the following method steps. A carrier (101) is provided with a holographic medium (104) attached to atop side (102) of the carrier (101). An optoelectronic semiconductor chip (105) is arranged at a bottom side (103) of the carrier (101) and the optoelectronic semiconductor chip (105) is connected to the carrier (101) rigidly. The optoelectronic semiconductor chip (105) is designed to emit electromagnetic radiation. A hologram is generated by illuminating the holographic medium (104). The hologram is designed as an optical component for electromagnetic radiation emitted by the optoelectronic semiconductor chip (105).

A laminated pane includes an outer pane having an outer surface and an interior surface, an inner pane having an outer surface and an interior surface, a first intermediate layer, and a hologram element having at least one hologram, wherein the first intermediate layer is arranged between the outer pane and the inner pane, the hologram element is arranged between the outer pane and the first intermediate layer or between the inner pane and the first intermediate layer, and wherein a UV protection layer is arranged on the interior surface of the outer pane.

This solution discloses a volume holographic optical diffusion element and its manufacturing method and device. By adding a first lens assembly between a first diffusion element and a holographic photosensitive material, the first lens assembly is used to project the real image of the first diffusion element onto the holographic photosensitive material layer. Due to the limited entrance pupil diameter of the first lens assembly, only light within a certain angle range of the light emitted by the random point light source generated when the signal light illuminates the first diffusion element can pass through the first lens assembly, resulting in a limited divergence angle for the light projected behind the real image of the holographic photosensitive material layer. Accordingly, the reproduced signal light generated during the display process also has a limited divergence angle, which not only meets the diffusion requirement that all real image points can enter the human eye, but also avoids the waste of light energy caused by excessive diffusion, thereby improving light energy utilization, increasing display brightness, and reducing device energy consumption, and has great practical value.

The invention relates to an external lighting device (30) for a motor vehicle (40) and to a motor vehicle (40) comprising such an external lighting device (30). The external lighting device (30) comprises a design screen (31) and at least one detection device (10) with an image capturing device (35) and a carrier medium (12). The carrier medium (12) is designed as a waveguide on which a coupling region (16) and a decoupling region (18) are provided. The carrier medium (12) comprising the coupling region (16) and the decoupling region (18) is designed to be flat and is adapted to the surface shape (33) of the design screen (31). The coupling region (16) and the decoupling region (18) are each designed as a holographic element (14). Light (100) which is incident on the external lighting device (30) from the surroundings is coupled into the carrier medium (12) via the coupling region (16), is transported to the decoupling region (18) by means of internal reflection, and is decoupled at the decoupling region. The image capturing device (35) is designed to detect the decoupled light (100) and provide same as image data which correlates to the detected light (100).

In some implementations, an optical master is created by using a nanoimprint alignment layer to pattern a liquid crystal layer. The nanoimprint alignment layer and the liquid crystal layer constitute the optical master. The optical master is positioned above a photo-alignment layer. The optical master is illuminated and light propagating through the nanoimprinted alignment layer and the liquid crystal layer is diffracted and subsequently strikes the photo-alignment layer. The incident diffracted light causes the pattern in the liquid crystal layer to be transferred to the photo-alignment layer. A second liquid crystal layer is deposited onto the patterned photo-alignment layer, which subsequently is used to align the molecules of the second liquid crystal layer. In some implementations, the second liquid crystal layer in the patterned photo-alignment layer may be utilized as a replica optical master or as a diffractive optical element, such as for directing light in optical devices such as display devices, including augmented reality display devices.

This application relates to a composition for a holographic recording medium and a holographic recording medium using the composition for a holographic recording medium. In this application, a substrate film-forming substance contained in the composition for a holographic recording medium is structurally designed, and a refractive index of a substrate is reduced to enhance an overall refractive index difference, so that a high-performance VHG is prepared.

Disclosed are a volume holographic optical diffusion element and a manufacturing method and apparatus thereof. A first lens assembly is provided between a first diffusion element and a holographic photosensitive material layer. A real image of the first diffusion element is projected onto the holographic photosensitive material layer by the first lens assembly. Among rays of light emitted by random point light sources generated when the first diffusion element is irradiated with signal light, only rays within a certain angle range can pass through the first lens assembly due to the constraint of the entrance pupil aperture of the first lens assembly, so that rays of light on a rear side of the real image projected onto the holographic photosensitive material layer have a limited divergence angle.

A method of displaying a Computer Generated Holographic (CGH) image by a display, including setting pixel values of a Spatial Light Modulator (SLM) included in a Head Mounted Display (HMD), producing a interference based holographic image at a first location by projecting coherent light onto the SLM, and re-imaging the holographic image from the first location to form a holographic image in front of an eye of a viewer wearing the HMD. Related apparatus and methods are also described.