114 results about "Holographic optical element" patented technology

The invention discloses a thiophene monomer, a holographic recording medium, a preparation method and a related device, the structural general formula of the thiophene monomer is shown in the specification, the refractive index of the monomer is larger than 1.8 and smaller than 1.9, the diffraction efficiency can be remarkably improved, the thiophene monomer is applied to preparation of a photopolymer type holographic recording medium, and the photopolymer type holographic recording medium with the sensitivity larger than 100 cm / mJ can be obtained. According to the holographic recording medium, the diffraction efficiency of the recording grating is larger than 95%, the refractive index modulation degree is larger than 0.1, and the shrinkage rate is lower than 1%, and further, the holographic recording medium can be used for preparing a volume holographic grating, a holographic optical element and an optical device.

The invention discloses a (methyl) acrylate monomer, a holographic recording medium, a preparation method and a related device.The structural formula of the (methyl) acrylate monomer is as shown in G1-G19. The preparation method is easy to operate and high in synthesis yield, and further, the holographic recording medium can be applied to holographic recording. According to the photopolymer holographic recording medium, the (methyl) acrylate monomer with the structure is introduced into the photopolymer holographic recording medium, so that the holographic recording medium with high sensitivity, high diffraction efficiency and no yellowing is obtained, and the invention further provides a preparation method of the holographic recording medium. The invention also provides a volume holographic grating, a holographic optical element and an optical device comprising the holographic recording medium.

The invention discloses a (methyl) acrylate monomer, a holographic recording medium, a preparation method and a related device.The structural formula of the (methyl) acrylate monomer is as shown in G1-G5. The preparation method is easy to operate and high in synthesis yield, and further, the holographic recording medium can be applied to holographic recording. The (methyl) acrylate monomer with the structure is introduced into the photopolymer type holographic recording medium, reverse migration of a short polymer chain can be effectively inhibited, and therefore the holographic recording medium with high sensitivity and high diffraction efficiency is obtained, and the invention further provides a preparation method of the holographic recording medium. The invention also provides a volume holographic grating, a holographic optical element and an optical device comprising the holographic recording medium.

The invention discloses a dendritic (methyl) acrylate monomer, a holographic recording medium, a preparation method and a related device. Wherein the structural formula of the dendritic (methyl) acrylate monomer is shown as G1-G12, the preparation method of the dendritic (methyl) acrylate monomer is simple and easy to operate, and further, the dendritic (methyl) acrylate monomer with the structure is introduced into the photopolymer type holographic recording medium, so that the photopolymer type holographic recording medium is prepared. The invention further provides a preparation method of the holographic recording medium, a volume holographic grating containing the holographic recording medium, a holographic optical element containing the holographic recording medium and an optical device containing the holographic recording medium.

The invention discloses a dithiocarbamate monomer, a holographic recording medium, a preparation method and a related device, the structural general formula of the monomer is as shown in G1 and G2, R1 represents any one of hydrogen, halogen and C1-C4 alkyl, R3 represents any one of hydrogen, halogen and C1-C4 alkyl, A1 represents C1-C4 alkyl, A2 represents hydrogen or methyl, n is a positive integer, and n = 1-10. The dithiocarbamate monomer provided by the invention has high refractive index, and the holographic recording medium with high sensitivity, high diffraction efficiency and high refractive index modulation degree can be obtained by applying the dithiocarbamate monomer to preparation of the photopolymer holographic recording medium; holographic recording media can be used to prepare volume holographic gratings, holographic optical elements, and optical devices.

The utility model provides a double head-up display fusion imaging system, which relates to the field of automobiles, and generates a first light beam and a second light beam carrying different projection information through an image generation unit, and adopts a diffusion element to carry out uniform light diffusion on the first light beam and the second light beam. The diffused first light beam is projected to a first position of the windshield by adopting the reflector assembly, the diffused second light beam is projected to a second position of the windshield, the light beam projected to the first position generates a diffraction effect under the action of the holographic optical element, and a close-shot image is formed in front of the windshield; the light beam projected at the second position forms a long-shot image in front of the windshield so as to display the long-shot image information carried by the second light beam. In the imaging system, only one holographic optical element and one set of optical transmission system are needed to complete display of two paths of projection information, and the system is simple in structure and smaller in size.

The invention discloses a dielectric computer-generated holographic optical element based on electrochemical nanoimprint and a preparation method thereof, and the method comprises the steps: carrying out the optimization design of the parameters of a unit structure of the dielectric computer-generated holographic optical element through numerical simulation, and obtaining an optimal parameter combination; obtaining a target hologram and a phase distribution diagram corresponding to the target hologram, determining an optimal parameter corresponding to the phase distribution diagram, and obtaining an arrangement diagram of a unit structure of the corresponding dielectric computer-generated holographic optical element; preparing a metalized template; providing a dielectric material substrate; based on a metalized template and a dielectric material substrate, a nano cavity structure complementary with the structure of a nano column in the metalized template is generated in the dielectric material substrate by adopting an electrochemical nano imprinting technology, and a three-dimensional micro-nano structure with a periodic unit structure array is formed. And obtaining the dielectric computer-generated holographic optical element corresponding to the target hologram. According to the invention, high-fidelity copying of the three-dimensional nanostructure can be realized.

The invention discloses an optical monomer, a holographic recording medium, a preparation method and a related device, the structural general formula of the optical monomer is as shown in G1-G6, the monomer is high in refractive index, the preparation method is simple, and further, the optical monomer with the structure is introduced into the photopolymer type holographic recording medium, so that the photopolymer type holographic recording medium is prepared. The invention further provides a preparation method of the holographic recording medium, a volume holographic grating containing the holographic recording medium, a holographic optical element containing the holographic recording medium and an optical device containing the holographic recording medium.

A holographic photopolymer material, a holographic photosensitive film, a holographic optical element, and a display device, wherein the holographic photopolymer material includes a polymer matrix, photopolymerizable monomers, and a photosensitizer. An index of refraction of the photopolymerizable monomer is greater than an index of refraction of the polymer matrix. A molecular structure of the polymer matrix includes a linear structure, and branch chains of the polymer matrix include activation groups; and / or the molecular structure of the polymer matrix includes a crosslinked structure.

This application discloses a holographic material and its preparation method, a holographic optical element, a holographic device, and a method for preparing a volume holographic grating. The method for preparing the holographic material includes: providing a blocked polyisocyanate, a first compound, a polymerizable monomer, a photoinitiator, and other additives; and mixing the blocked polyisocyanate, the first compound, the polymerizable monomer, the photoinitiator, and the other additives uniformly under light-protected conditions to obtain the holographic material. This method allows for the pre-mixing and long-term storage of second-order holographic materials, control of first-order reactions, and improvement of the overall volume holographic grating preparation process.

Holographic photopolymer materials, holographic photosensitive films, holographic optical elements, and display devices are provided. The holographic photopolymer material comprises a polymer matrix, a photopolymerizable monomer, and a photosensitizer. The refractive index of the photopolymerizable monomer is greater than that of the polymer matrix. The molecular structure of the polymer matrix includes a linear structure, the branched chains of the polymer matrix include activating groups, and / or the molecular structure of the polymer matrix includes a crosslinked structure. Because polymer matrices with a crosslinked molecular structure have a high glass transition temperature, holographic photopolymer materials have good heat resistance. Because holographic photopolymer materials with a linear molecular structure include activating groups that can form crosslinked structures, optical elements made from holographic photopolymer materials can have crosslinked structures, i.e., optical elements can have good heat resistance. Holographic photopolymer materials have good heat resistance, or optical elements made from holographic photopolymer materials can have good heat resistance.

The present application relates to a kind of color holographic optical elements and its manufacturing method, manufacturing system and correction method, which can solve the problem of focal shift caused by wavelength inconsistency, help to improve the quality of reproduced image.The correction method of the color holographic optical element includes the following steps: adjusting the central ray incidence angle of various color recording light according to the wavelength of color recording light and the wavelength of color reproduction light, to correct the lateral focal shift of color holographic optical element in the process of image reproduction;And adjusting the edge ray incidence angle of various color recording light according to the wavelength of color recording light and the wavelength of color reproduction light, to correct the axial defocus of color holographic optical element in the process of image reproduction.

A method for producing a holographic optical element. The method includes a step of exposing a recording material to a phase pattern which is provided by a first modulated light beam with a first phase portion. Furthermore, the method includes a step of an additional exposure of the recording material to the phase pattern, which is provided by a second modulated light beam with a second phase portion, wherein the second phase portion has a phase offset with respect to the first phase portion in order to produce a holographic optical element.

The present application relates to a vehicle-mounted projection display device, a vehicle-mounted projection display system, and a vehicle. The vehicle-mounted projection display device comprises: a curved optical waveguide, mounted on a vehicle body; a projector, the projector being configured to project an image source light beam to the curved optical waveguide; an coupling-in holographic optical element, arranged at an coupling-in position of the curved optical waveguide; and a coupling-out holographic optical element, arranged at an optical coupling-out side of the curved optical waveguide. The coupling-in holographic optical element is configured to guide the propagation of the image source light beam coupled into the curved optical waveguide to a plurality of coupling-out positions at the optical coupling-out side, such that the size of a coupling-out light beam at each coupling-out position guided by the coupling-out holographic optical element at the coupling-out positions is within a preset size range, and the range of an eyebox imaged on the optical coupling-out side is within a preset eyebox range.

The present application provides an eye tracking display device and its method and near-eye display equipment, which can solve the problem of not seeing images or image ghosting caused by small eye sockets. The eye tracking display device comprises: a laser scanning projection component for projecting image light with variable image position according to an encoded input image source; a holographic optical element for redirecting and reflecting the image light to image on the retina, and inversely reflecting the image light reflected back via the retina; and an eye tracking component, which comprises a photosensitive element and a light splitting element arranged on the photosensitive side of the photosensitive element. The light splitting element is arranged in the light path between the laser scanning projection component and the holographic optical element, for reflecting the projected image light to propagate to the holographic optical element, and transmitting the inversely reflected image light to propagate to the photosensitive element; and the photosensitive element is used to capture the image light transmitted through the light splitting element to track the eye pupil posture.

A device for manufacturing a holographic optical element is provided with: a laser light source (1); a branching mirror (4) that branches the laser beam (L1) irradiated from the laser light source (1) into a laser beam (L2) and a laser beam (L3); a mirror (6) that reflects the laser beam (L2); a light guide plate (20) including a holographic optical element (11a); a coupler (10a) that causes the laser light (L3) to be incident on the light guide plate (20); and a displacement unit that displaces the irradiation position of the laser light (L3).

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.

The present disclosure relates to a multi-focal head-up display (MHUD) system and method to solve a visual fatigue problem generated in a vehicle head-up display and implement an augmented reality (AR) function. The present disclosure provides a multi-focal augmented reality head-up display (MHUD) system including an image projector which generates and emits a plurality of beams, an optical device which guides the plurality of beams emitted from the image projector to individual paths, a polarization control device which controls polarization states of the plurality of beams incident from the optical device, and a plurality of holographic optical elements (HOEs) which receives the plurality of beams emitted from the polarization control device to project a virtual image plane at different focal distances.

The invention relates to an optical system (10a) for a virtual retinal display having an illumination device (12). The lighting device (12) has a first laser diode (7) for emitting a first light beam (8) in a first wavelength range. The first wavelength range is shifted towards a second wavelength range depending on the temperature of the first laser diode (7). Furthermore, the optical system (10a) has a first controllable deflection unit (9) for the first light beam (8) for the scanning projection of the image content. Furthermore, the optical system (10a) has a holographic optical element (5) for deflecting the first light beam (8) onto the eye (3). The holographic optical element (5) is formed from a liquid crystal and has a first holographic function with a first diffraction efficiency range and a second holographic function with a second diffraction efficiency range. The first wavelength range at least partially overlaps a first diffraction efficiency range and the second wavelength range at least partially overlaps a second diffraction efficiency range. Furthermore, the optical system (10a) has a control unit (11) for actuating the holographic optical element (5) or the polarization switch in such a way as to depend on detected information relating to a first or second wavelength range of the emitted first light beam (8), the holographic optical element (5) is arranged such that a first light beam (8) having a first wavelength and incident on the holographic optical element (5) at a first point in time at a first angle of incidence (15) and a first light beam (8) having a second wavelength and incident on the holographic optical element (5) at a second point in time following the first point in time at the first angle of incidence (15) are deflected onto the eye (3).

An apparatus includes a holographic optical element (HOE) and an optical sensor. The HOE is configured to have an interference pattern that functions as mirrors in an inverted server when illuminated by a light source. The HOE is placed on a bottom surface of the inverted server. The optical sensor is directed at the HOE and configured to detect a fluorescent light emitted from a liquid drop at a first wavelength when illuminated by the light source. The liquid drop lands on the HOE from a cooling liquid. The interference pattern is created by a laser beam operating to form a hologram at a second wavelength substantially close to the first wavelength.

A glasses-type augmented reality device and system with minimized volume are disclosed. According to one aspect of the present embodiment, an augmented reality device that provides a digital holographic image incident from the outside to a wearer as a holographic image is provided, characterized by including a plurality of holographic optical elements (HOE) arranged in a concentric circle shape having different radii within an optical configuration worn by the wearer, which diffract the incident digital holographic image and provide it to the wearer.

This invention belongs to the field of projection display technology, specifically disclosing a holographic optical element, including a substrate and a holographic recording layer disposed on the substrate. The holographic recording layer is made of holographic optical material, and a polarization hologram is recorded within the holographic optical material. This invention provides a holographic optical element primarily used in polarization recovery systems in fields such as laser display, optical projection, and polarized illumination. It is used to convert S-light in partially polarized light output from a laser into P-light, achieving polarization unification, thereby improving light energy utilization and solving the problems of large size, complex fabrication, and high cost of existing polarization recovery schemes.

The invention belongs to the technical field of optical processing, and relates to a holographic optical element preparation method and system and a double-view-angle head-up display system, and the method comprises the steps: determining a first direction vector in a three-dimensional space according to the design parameters of a reference light beam and a signal light beam relative to a holographic optical element; adjusting the angle of the holographic optical element to enable the holographic optical element to be in a vertical position in the three-dimensional coordinate system; calculating a second direction vector according to the first direction vector and the adjustment angle of the vertical position; adjusting the angle of the holographic optical element again according to the second direction vector to enable the reference light beam and the signal light beam to be in the same plane; and performing exposure interference on the holographic optical element by using the holographic optical element preparation system so as to enable the photosensitive material in the holographic optical element to form a standing wave pattern. The three-dimensional light path structure in the optical element preparation process is converted into the two-dimensional exposure interference through the light beam position conversion method, the preparation complexity is reduced, and the head-up display accuracy is guaranteed.

A wavefront manipulator (10) is described, comprising a first holographic optical element (11) with a front (13) and a back (15) and a second holographic optical element (12) with a front (14) and a back (16), which are arranged sequentially in a beam path (3), wherein the second holographic optical element (12) is arranged downstream of the first holographic optical element (11) in the beam path (3), the front (13) of the first holographic optical element (11) facing the back (16) of the second holographic optical element (12). The back (15) of the first holographic optical element (11) comprises a surface designed for total internal reflection of light incident on the surface from the front (13) of the first holographic optical element (11).The first holographic optical element (11) comprises at least one hologram configured to diffract light incident on the first holographic optical element (11) through the back (15) towards the back (15) such that the diffracted light is totally internally reflected at the back (15) towards the front (13). The front (14) of the second holographic optical element (12) comprises a surface configured for total internal reflection of light incident on the surface from the back (15) of the first holographic optical element (11).The second holographic optical element (12) comprises at least one hologram which is configured to diffract light reflected from the surface of the front (14) of the second holographic optical element (12) into the second holographic optical element (12) in the direction of the front (14) such that the diffracted light exits through the front (14) of the second holographic optical element (12).

The present technology is related to optics and optical systems for display applications and their fabrication and integration with display modules. An inventive fabrication process involves forming meta-optical structures with engineered light emission or scattering characteristics, and their implementation in displays to empower new functions such as 3-D displays, optical combiners for augmented reality, and beyond. In addition to metasurfaces, inventive techniques can be used in other thin optics structures, including but not limited to sub -wavelength optics, metasurfaces, metamaterials, diffractive optical elements (DOEs), holographic optical elements (HOEs), gradient-index (GRIN) optics, micro-optics, hybrid optical systems, etc.

The present invention relates to a holographic optical element capable of improving the brightness of an enhanced image, a manufacturing method for the holographic optical element, and a manufacturing apparatus for the holographic optical element. The holographic optical element is configured by combining a plurality of optical elements in which respective interference patterns recorded on each optical element have the same pitch as each other but different tilt angles from each other.

The invention relates to vehicle-mounted projection display equipment, a vehicle-mounted projection display system and a vehicle. The vehicle-mounted projection display device includes: a curved optical waveguide mounted on a vehicle body; the projector is used for projecting an image source light beam to the curved surface optical waveguide; the coupling-in holographic optical element is arranged at the coupling-in position of the curved-surface optical waveguide; the coupling-out holographic optical element is arranged on the optical coupling-out side of the curved-surface optical waveguide; wherein the coupling-in holographic optical element is used for guiding an image source light beam coupled in the curved surface optical waveguide to be transmitted to a plurality of coupling-out positions of the optical coupling-out side, so that after the image source light beam is guided by the coupling-out holographic optical element at the coupling-out position, the size of the coupling-out light beam at each coupling-out position is within a preset size range; and an eye box range imaged on the optical coupling-out side is in a preset eye box range. The device is small in size and can support clear display of images in a preset eye box range. In addition to a traditional HUD scene, the method can also be widely applied to scenes with large image sizes, such as AR-HUD and MR-HUD.

An apparatus, system, and method for a waveguide system may be used to support eye tracking in a head mounted display (HMD). The waveguide system may be positioned in a user's field of view and within a lens assembly of the HMD to capture light that is reflected from an eye. The waveguide system may include a holographic optical element (HOE) configured to in-couple light into a waveguide and direct the light to an out-coupling grating. The HOE may be configured to map a number of incident light rays to a corresponding number of total internal reflection (TIR) angles. The incident light rays may include at least some oblique light rays that are non-normal to an input surface of the HOE. The HOE may have a field of view (FOV) of an eyebox region that is at least partially outside of a periphery of the input surface of the HOE.

This disclosure relates to a glasses-type augmented reality apparatus, and system with compact dimensions. An aspect of the present embodiment provides an augmented reality apparatus which provides a wearer with a digital holographic image incident from the outside as a holographic image, the apparatus including a plurality of holographic optical elements (HOEs) arranged in the form of concentric circles having different radii inside an optical configuration worn by the wearer to diffract the incident digital holographic image and provide the diffracted digital holographic image to the wearer.

A head-up display according to the present embodiment includes: an image generation device from which image light is emitted; a plate spaced apart from the image generation device; and a holographic optical element that is disposed on the plate to reflect, toward the windshield, the image light emitted from the image generation device.