84 results about "Holographic screen" patented technology

A device, such as a heads up display, includes equipment for generating a virtual image in the field of view of an observer. The equipment includes at least one light source having a wavelength range less than 2 nm. The light source can be a low pressure gas discharge lamp. The device also includes a holographic optical element that provides a virtual image. The device also includes an image source, such as a mask or an LCD. In one embodiment the holographic optical element combines an image on a display with an ambient image. The holographic element provides multiple colors undistorted in a virtual image appearing to the observer as converging from the same distance.

In an information system and a method for providing information in correlation with light that is incident on an eye, a pair of spectacles includes a holographic element that is supported in front of the eye of a wearer of the spectacles. An optical scanning device detects light that is incident on the eye via the holographic element.

The present invention is directed to an apparatus and method for displaying 3D images. The apparatus comprises: a) a screen with angular dependent diffusion characteristics for direction selectively forwarding light; b) a screen illuminating system, the screen illuminating system comprising multiple modules for generating multiple light beams incident on points of the screen, the modules being arranged so that each point of the screen is illuminated by multiple modules, and the incident light beams generated by one module are projected into multiple different directions from the module towards multiple different points of the screen, and further the different incident light beams generated by one module are forwarded towards different emitting directions from the screen, means for coding each incident light beam with the image information of a single image point in the module, where the 3D image perceived by an observer being generated by multiple modules; c) a control system to control the modules; and d) means for imparting an exit divergence to the exiting light beams being transmitted through or reflected from the screen, the measure of the exit divergence substantially corresponding to the angle between neighbouring emitting directions associated with the optically neighbouring modules, go as to provide a substantially continuous motion parallax in the 3D image perceived by an observer. The apparatus according to the invention comprises imaging means for generating the incident light beams with a convergent section converging substantially towards a point of the screen, where a convergence of the incident light beams is substantially equal to the exit divergence of the light beams exiting the screen. The modules can be video projectors, LED projectors, the optical engines of these, or the like, arranged periodically shifted, preferably in the horizontal direction and the diffuser screen is realised as a holographic screen, arrays of diffractive or refractive elements, retroreflective surfaces, or any combination thereof, for imparting a larger divergence to the exit light beams along at least one, preferably in the vertical direction, while in the other direction the angle of divergence provided by the screen is smaller than the angle between the neighbouring emitting directions associated with the optically neighbouring modules. The invention is also directed to a method implemented by the apparatus according to the invention.

A display panel assembly comprises a transflective holographic screen, i.e., a transparent screen that reflects light from a projection system, comprising at least a volume hologram, a first protective element and a second protective element, each arranged in contact with the volume hologram such that the volume hologram is sandwiched between the first protective element and the second protective element. The display panel assembly further comprises a projection system focusing an image on the volume hologram comprising at least projection optics, mounting means arranged to fixedly mount the projection system relatively to the transflective holographic screen. The volume hologram comprises a plurality of diffractive patterns disposed in sequence across the volume hologram, each of the plurality of diffractive patterns being configured to diffuse the light rays from the projection system in a determined direction corresponding to the specific diffractive pattern and oriented towards a position of an intended eye of a user wearing the display panel assembly.

A method is proposed, how to produce a holographic screen for projection of the three-dimensional color images, where a narrow and elongate slit-shaped diffuser is recorded on a hologram as an object to ensure the well defined viewing zone forming in the course of the image projection. Further to the back side of the holographic screen a mirror is attached to transform it into reflection mode of operation. Further, the holographic screen is rotated under a control of an eye-tracking system to provide viewing zone movement together with a viewer's eye. Also, a diffuser with vertical light scattering is attached to a surface of the holographic screen to increase a vertical size of a viewing zone of the holographic screen. In addition, two or more holographic screens manufactured by this method are combined in a mosaic manner to form a big size holographic screen.

A method of producing a holographic screen for reconstruction of uniformly magnified three-dimensional images from projected integral photographs. The screen is produced as an array of holographic imaging elements whose center distances and focal lengths have been scaled-up uniformly by the magnification factor. In the preferred embodiment, when illuminated with a white light reference beam, the screen reconstructs a linear array comprising an alternating series of red, green, and blue vertical lines. However, when an enlarged integral photograph representative of a three-dimensional scene is correctly projected onto the screen, a uniformly magnified three-dimensional image of that scene is reconstructed. The screen may be manufactured as rectangular tiles that are assembled to form the entire screen.

A projection display system includes (1) a polarizer, (2) a holographic screen with holographic optical elements having the properties of a display portion and a polarizing portion, and (3) a projector for projecting an image through the polarizer and onto the holographic screen. The polarizing portion of the holographic screen has a different polarization direction from the polarizer such that the image is visible from a first side of the holographic screen and invisible from a second side of the holographic screen.

The invention relates to a waveguide type integrated imaging three-dimensional display system based on a diffraction optical element. A micro displayer (1) is arranged at the position of the focal length of a holographic microlens array of the surface of the input end of a waveguide (3), a two-dimensional element image passes through the holographic microlens array and is imaged to obtain an image including depth and parallax information, the obtained image is coupled into the transparent waveguide (3) through a holographic lens on the surface of the input end of the waveguide (3), is spread through total reflection and is output in a coupling mode through a holographic lens on the surface of the output end of the waveguide (3), and the image is observed by the human eyes. According to the system, the diffraction optical element is introduced in to overcome the defects that in the technical background, the size is large, the weight is large, and the structure is complex, and integrated monocular three-dimensional displaying is achieved. Meanwhile, the optical element, the waveguide (3), is introduced in, and off-axis large-system pupil sight-thorough monocular three-dimensional displaying with the high transmission rate is achieved. The system can be widely applied to integrated imaging three-dimensional display systems.

A transparent holographic display screen for laser projection of at least one or more monochromatic wavelengths, is constructed to selectively diffuse an incident narrow-band laser beam at a predetermined solid angle and simultaneously to pass wide-band ambient light unobstructed through the display screen. The transparent holographic display screen has at least one holographic volume phase grating which is optically coupled to or integrated with a transparent carrier plate. The holographic display screen with its volume grating is produced by illuminating a real screen as an object into a primary hologram and recording a real holographic image of said real screen into a secondary hologram.

A portable terminal device, which employs a display unit utilizing a holographic screen, a main housing, a holographic screen, and an optical system. The holographic screen is disposed at a predetermined portion of the main housing while being exposed to an exterior of the main housing. The holographic screen optically displays information by means of image-light which is projected to the holographic screen. The optical system is spaced apart from the holographic screen and provides the holographic screen with the image-light.

The invention relates to a stereo digital holographical sand table system built on the basis of a three-dimensional landscape of multi-view-angle aeroplane photography. The system comprises a stage, a virtual reality display assembly, a holographical digital intelligent sand table, a playing sever sub system, a projection imaging sub system and an intelligent general control platform, wherein the virtual reality display assembly comprises a first display part, a second display part, a third display part and a fourth display part; the holographical digital intelligent sand table comprises a field photon holographical display map. A projection screen, a 3D (three-dimensional) screen and a holographical screen which are in multilayer arrangement are used; the fusion of different stage display spaces is realized; the effect of integrating real scenes with virtual images is generated; the perfect technical effect is shown; then, the music and the lamp light are combined; the dreamlike effect which cannot be realized by a conventional stage is achieved. The multifunction of a display object can be shown on a single video carrier; the problems that a conventional sand table model needs to be frequently regulated, the display mode is single, and other limitation exists are solved.

The invention relates to the field of 3D display, and discloses an all-solid-state holographic projector, which comprises an imaging module and a projection lens group arranged in the holographic projector, wherein the imaging module is used for providing a plurality of equivalent image surfaces which are not overlapped or are parallel to one another, a distance between any two adjacent equivalentimage surfaces is L(mm), the distance between adjacent pixels on a single equivalent image surface is d (mm), and L is greater than or equal to 2d; and the projection lens group is used for projecting the image surface group formed by the imaging module to form a 3D projection picture of depth information in space. A real 3D image projection function is realized by introducing a scheme of a plurality of equivalent image surfaces. Because the equivalent image surface is distributed at different depths in the space, the projected picture is also provided with depth information, and the real 3Ddisplay content can be provided for the user by matching with the holographic screen. The moving parts are not needed in the working process, the reliability and the image quality are greatly improved, and meanwhile the production cost and the control difficulty are reduced.

The present invention provides an interactive holographic projection method on the basis of a three-dimensional model. The three-dimensional model is analyzed to a holographic projection model through a computer; the holographic projection model is projected to a holographic projection pyramid or holographic screen through a projector or a display screen connected with the computer, and holographic projection images are displayed; or an infrared somatosensory device is configured to control the holographic projection model, project the holographic projection model onto the holographic projection pyramid or holographic screen and display the holographic projection images so as to realize interactive holographic projection. The interactive holographic projection method on the basis of a three-dimensional model is able to solve the problems that the interactive holographic projection cost is high and the three-dimensional model is connected with the holographic projection.

A holographic screen for displaying images by diffracting and dispersing an image beam projected by an image projector comprises a main hologram for diffracting and dispersing an incident image beam from one of an upward angle and a downward angle, and a directional dispersion hologram, disposed on an image projector side of the main hologram, for dispersing and transmitting part of the image beam within a predetermined angle range centered on a direction of incidence thereof, and directly transmitting another part of the image beam, thereby providing a holographic screen that can maintain the brightness and improve the color reproducibility of a displayed image.

A fingerprint sensor integrated display using a holographic optical element and a recording and reconstruction method of the holographic optical element are disclosed. The fingerprint sensor integrated display includes a display panel on which an input image is displayed, a transparent substrate disposed on the display panel, and a light entering element configured to irradiate light from a light source onto the transparent substrate. A particular type of visual information is reconstructed through a holographic element at a location of the light entering element.

A method of producing a big size holographic screen for projection of the stereoscopic or multiview 3-dimensional color images is proposed, where a narrow and elongate slit-shaped diffuser is recorded on the hologram as an object to ensure the well defined viewing zone forming in course of the image projection. As compared with the previous art the diffuser length is increased by the calculated value to provide undistorted color reproduction on whole screen surface. The parameters required for the recording of the holographic screen, including the position of a photoplate with respect to the diffuser, the position of a reference wave point source with respect to the diffuser, the distance from which an image is observed and so on are determined by consideration of the phase relationships between the reference, object, projector and reconstructed waves on the photoplate surface.

The invention brings forward an imitation display apparatus capable of dynamically performing calligraphy or painting imitation, and a display method thereof. A holographic screen and a micro projection technology are employed, dynamic imitation of calligraphy or paintings can be realized through dynamic demonstration of projection, the problem that an imitation learning apparatus can only realize static imitation in the prior art is solved, holographic screen imaging is employed, the sharpness, the contrast and the color reduction degree are quite high, and the display effect is quite good. Besides, a desk body is different from the shape of a conventional desk body, the desk body employs a structure with a rhombus-shaped side surface, projection light is enabled to maintain a certain angle with the visual angle of a user, direct light is avoided, and human eyes are protected. Besides, the invention also brings forward an imitation projection display method. User imitation learning information is compared with preset standard information. A learning result of a user is evaluated by use of an intelligent apparatus, and learning and improvement of the user can be facilitated.

The invention discloses a three-dimensional optical field display system and a display parameter determination method. The system comprises a liquid crystal display panel, a two-dimensional convex lens array, and a holographic function screen. The two-dimensional convex lens array is arranged between the liquid crystal display panel and the holographic function screen. The distance between the two-dimensional convex lens array and the liquid crystal display panel is l; the distance between the two-dimensional convex lens array and the holographic function screen is L; the diameter of each convex lens in the two-dimensional convex lens array; the focal length of each convex lens is f; and the central spacing between the adjacent convex lens is g. The distance 1 between the two-dimensional convex lens array and the liquid crystal display panel, the distance L between the two-dimensional convex lens array and the holographic function screen, and the focal length f of the convex lens meet a Gaussian imaging formula. The divergence angle of the holographic function screen is alpha. On the basis of divergence of the holographic function screen, distortion of the integrated imaging three-dimensional display content can be corrected; and the watcher experience can be improved.

The invention provides a near-vision optical field display system and a control circuit. The system comprises N layers of holographic elements, waveguides corresponding to each layer of holographic elements and an imaging device; each layer of holographic elements comprises a holographic input sub-element and a holographic output sub-element, which occur in pairs; within a display period, the imaging device projects light to the holographic input sub-element in the i layer of holographic elements according to a preset time interval, the holographic input sub-element emits the projected light to the waveguide corresponding to the i layer for conduction to arrive at the holographic output sub-element of the i layer, the light output by the holographic output sub-elements of the layers are fused and output based on time division multiplexing so as to form 3D images in human eyes. By adoption of the system, the real optical field in a three-dimensional space can be simulated, natural 3D display is realized, and the visual fatigue and dizziness caused by convergence condition conflict in the prior art are solved.

The invention relates to the field of 3D display and discloses a reflection type geometric holographic display system. The system comprises at least one projector, an auxiliary imaging screen, a reflection-type geometric holographic screen located on one side of the auxiliary imaging screen or two reflection-type geometric holographic screens located on the two sides of the auxiliary imaging screen respectively, a supporting structure and a controller, and the reflection-type geometric holographic screens are used for carrying out retroreflection on light irradiated to the reflection-type geometric holographic screens; the number of viewpoints of the reflective geometric holographic display system is n; the mean value of the diameters of the light-transmitting parts of the lenses on the outermost side of the projector is D decimeters; the mean value of the projection light source power of the projector is P watt; the requirements are met: a reflective geometric holographic screen capable of modulating light rays at any angle to realize retro-reflection is introduced; according to the invention, the incident light is modulated, other optical modules are omitted, the cost is saved toa certain extent, the occupied space of the system is reduced. Meanwhile, optimized design parameter configuration is provided, and the purpose of considering both the display effect and the system reliability is achieved.

The invention provides a method and system for manufacturing a hologram and holographic lens combined element. The method comprises the steps of: emitting a light beam by a laser light source, splitting the light beam into two light beams through a spectroscope and respectively reflecting the two light beams by two reflectors, enabling one light beam to pass through a beam expanding lens and a pinhole filter to become uniform diverging light and enabling the other light beam to pass through an image imaging system to become parallel light (object light), wherein the diverging light is interfered with the parallel light; recording relevant information on a holofilm, selecting proper exposure time according to the light intensity; and obtaining the hologram and holographic lens combined element after developing. The method is simple and easy to realize; and the manufactured hologram and holographic lens combined element records properties of a lens and an object image, thereby overcoming the defect that the traditional holographic lens has no function of diffracting images of reticles and the like, and laying the foundation for providing a simpler and more efficient holographic collimator light path.

The embodiment of the invention provides a three-dimensional light field display system. The three-dimensional light field display system includes a backlight source, a liquid crystal panel, a cylindrical lens grating, a holographic function screen and a slit grating, wherein the backlight source is used for projecting light to the liquid crystal panel; the liquid crystal panel, the cylindrical lens grating, the holographic function screen and the slit grating are arranged along the propagation direction of the light successively; the liquid crystal panel is used for modulating the light projected from the backlight source; the cylindrical lens grating is used for providing a single-parallax light field with a stereoscopic effect on the basis of the modulated light; the holographic function screen is used to diverge the light field provided by the cylindrical lens grating, so that the observer can see the light field provided by the cylindrical lens grating from different angles; and the slit grating It is used to provide a full-parallax light field with a stereoscopic effect based on the divergent light field. The three-dimensional light field display system provides a single-parallax light field with a stereoscopic effect and a holographic function screen divergence field by setting the cylindrical lens grating, and provides a full-parallax light field with a stereoscopic effect by setting the slit grating, and can realize full parallax viewing through mutual cooperation of the single-parallax light field, the holographic function screen divergence field and the full-parallax light field.

The invention discloses an AR and holographic intelligent device. The device comprises a host, a holographic screen, a camera, a microphone, a remote controller, models, magnets and a light source, wherein the host comprises a display screen, and the models comprise sequence numbers for identifying the models; the host is used for carrying out central operations and image rendering, and acquiring the sequence numbers of the models, and further acquiring virtual information corresponding to the sequence numbers according to the sequence numbers, the display screen is used for displaying the obtained virtual information; the holographic screen is used for displaying the virtual information displayed by the display screen on the holographic screen for a user to watch; the magnets are used for fixing the models to make the virtual information and the models aligned; the light source is used for displaying or hiding the models; the camera, the microphone and remote controller are respectively used for acquiring gestures, voice and key information or somatosensory information of the user, and the host controls the content of the virtual information according to information sent by the user. Therefore, the models can be combined with the virtual information, furthermore, the content of the virtual information can be controlled to realize interaction between the user and the models.

The invention discloses a holographic projection device which comprises a box body, wherein a holographic display screen capable of being accommodated in an upper cover of the box body is arranged onthe upper cover of the box body; the holographic display screen is formed by splicing four transparent plates; the transparent plates are trapezoidal, and short bottom sides of the transparent platesare arranged on the upper cover of the box body in a hinged manner; the four transparent plates upwards turn by 45 degrees and encircled to be spliced into a pyramid-shaped holographic display screen;an opening is formed in the middle of the upper cover of the box body; a closing assembly is arranged on the opening; a drive assembly is arranged in the box body; a projection assembly is arranged in the box body and positioned just under the opening. According to the arrangement of the spliced holographic display screen, the projection device is convenient to accommodate and move during transportation, and damage of the holographic display screen in the transportation process is avoided; due to the arrangement of the drive assembly, the moving synchronism of the transparent plates is ensured, the encircling tightness of the transparent plates is ensured, and the display effect of the holographic display screen is further ensured. Meanwhile, equipment input is reduced, and the manufacturing cost is saved.

In a hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, when a white light (image light) is projected on the hologram screen; and when a distance between two points at optional two points A and B on a surface of the hologram screen is given by 20 cm or less, and a value of the CIE 1976 chromaticity coordinate (u', v') at the point A is given by (u'A, v'A) and the value of the CIE 1976 chromaticity coordinate (u', v') at the point B is given by (u'B, v'B); the output light perpendicularly from the surface of the hologram screen has a color distribution in which a color difference DELTAu'v' between two points A and B is derived from the following formula (1) and given by 0.06 or less, where, the formula (1) is expressed by, <paragraph lvl="0"><in-line-formula>DELTAu'v'=[(u'A-u'B)2+(v'A-v'B)2]½ (1) < / in-line-formula>Further, the output light, which is output to a viewpoint defined by the following formula (2) from the surface of the hologram screen, has the color distribution in which a color difference DELTAu'v' between two points A and B is derived from the above formula (1) and given by 0.01 or less, where, the formula (2) is expressed by, <paragraph lvl="0"><in-line-formula>H / 2L=0.1 (2) < / in-line-formula>in the formula (2), L is a distance between the viewpoint and a center of the hologram screen, and H is a length of the hologram screen in the direction of the height.

The invention relates to a true three-dimensional image display system and a true three-dimensional image display method. The true three-dimensional image display system that is used for projecting K three-dimensional images to K view fields comprises at least one image source, an optical compression device, a holographic screen, and an optical scanning device. To be specific, the at least one image source is used for generating a plurality of holographic image light beams, wherein each holographic image light beam has image information of H-column pixels of the three-dimensional images and has N*K-column pixels. The optical compression device is used for compressing all the holographic image light beams to form narrow holographic image light beams; and each narrow holographic image light beam includes N-column view field image light beams and each column of view field image light beams include K columns of pixels. The holographic screen includes diffraction units that are used for receiving all the narrow holographic image light beams and diffracting the K columns of pixels of all columns of view field image light beams to the K view fields through all the imaging points. And the optical scanning device is used for scanning all the narrow holographic image light beams to the corresponding diffraction units. According to the invention, displaying of a true three-dimensional image can be realized and the resolution ratio is high.

In a hologram screen for reproducing an image based on an output light obtained by scattering and diffusing an image light from an image projector, when a white light (image light) is projected on the hologram screen; and when a distance between two points at optional two points A and B on a surface of the hologram screen is given by 20 cm or less, and a value of the CIE 1976 chromaticity coordinate (u', v') at the point A is given by (u'A, v'A) and the value of the CIE 1976 chromaticity coordinate (u', v') at the point B is given by (u'B, V'B); the output light perpendicularly from the surface of the hologram screen has a color distribution in which a color difference DELTAu'v' between two points A and B is derived from the following formula (1) and given by 0.06 or less, where, the formula (1) is expressed by,<paragraph lvl="0"><in-line-formula>DELTAu'v'=[(u'A-u'B)2+(v'A-v'B)2]½ (1)< / in-line-formula>Further, the output light, which is output to a viewpoint defined by the following formula (2) from the surface of the hologram screen, has the color distribution in which a color difference DELTAu'v' between two points A and B is derived from the above formula (1) and given by 0.01 or less, where, the formula (2) is expressed by,<paragraph lvl="0"><in-line-formula>H / 2L=0.1 (2)< / in-line-formula>in the formula (2), L is a distance between the viewpoint and a center of the hologram screen, and H is a length of the hologram screen in the direction of the height.

The application provides a hologram generation method and a color holographic display system. The method comprises the following steps: providing three primary color light wave information and initiallight wave information of a plurality of object surfaces of an object to be displayed, wherein the amplitude of the initial light wave information is a unit amplitude and The phase is random; Simulating the propagation of the initial light wave information back and forth between a holographic surface and a plurality of object surfaces of the object to be displayed in a computer program; propagating The initial light wave information back and forth between the holographic surface and the plurality of object surfaces to complete a round iteration; In each iteration, replacing the amplitude of the light wave information with a corresponding target amplitude on the holographic surface and the plurality of object surfaces for each primary color light wave information, and retaining a phase; generating a color hologram, and carrying the light wave information of the color hologram as the new initial light wave information into the next iteration until a color hologram capable of reproducinga three-dimensional color image is obtained, and terminating the iteration. This method can generate color holograms which can reconstruct three-dimensional color images.