Abstract

Provided in the present application is a holographic display system, comprising an on-site holographic display system, a transmissive geometric holographic display system, a geometric holographic display system with folded optical path, and a reflective geometric holographic display system. A display element capable of directly displaying screens provided with depth of field information is used to project a diverging 3D image in the air without the aid of another reference light source. The image is converted by a projection screen of an equivalent negative refractive index flat lens to then obtain an observable 3D image suspended in the air, which reduces costs. At the same time, the 3D image may be displayed in front of or behind the projection screen, the display space is infinite, and in a very small device space, a super large screen and super deep depth of field may also be displayed.

IPC Classes  ?

• G02B 30/56 - Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels by projecting aerial or floating images
• G02B 30/40 - Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images giving the observer of a single two-dimensional [2D] image a perception of depth
• G02B 30/54 - Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels the 3D volume being generated by moving a 2D surface, e.g. by vibrating or rotating the 2D surface
• H04N 13/383 - Image reproducers using viewer tracking for tracking with gaze detection, i.e. detecting the lines of sight of the viewer's eyes

Abstract

A geometrical holographic display system with an optimized display configuration. The system comprises: at least one projector (1), a geometrical holographic screen (2), a support structure (3) that provides support for the projector (1) and the geometrical holographic screen (2), and a controller (4) electrically connected to the projector (1), wherein for a preset number of viewpoints, the effective projection area of the geometrical holographic screen (2) is SP ㎡, the area of a single viewpoint is SL ㎡, and an optical path distance between the center of the outermost lens of any single projector (1) and the center of the geometrical holographic screen (2) in a working state is L meters, such that the effective viewing solid angle of each viewpoint meets: Global optimization and constraint are performed on components of the entire system, such that the display system is always within the optimal configuration interval, the costs are controlled, and the optimal comprehensive performance of the display system can also be realized.

IPC Classes  ?

• G03B 35/18 - Stereoscopic photography by simultaneous viewing

Abstract

A Bragg periodic scanning-type holographic imaging device, comprising an imaging element (1), an imaging lens group (3) and a focal depth scanning mechanism (5), which are respectively arranged inside the holographic imaging device, wherein the imaging element (1) is used for providing a plurality of equivalent image planes (2) that do not overlap or are mutually parallel; the imaging lens group (3) is used for optical imaging, and a plurality of two-dimensional tangent planes (4) are formed thereon; and the focal depth scanning mechanism (5) is respectively connected to the imaging element (1) and/or the imaging lens group (3), and is used for controlling the spatial position change of the imaging element (1) and/or the imaging lens group (3), so as to realize the voxel scanning of the two-dimensional tangent planes (4). By means of introducing a multi-focal plane and a Bragg periodic scanning mode, a 3D imaging/projection display function with an ultra-high resolution and an ultra-fast frame frequency can be stably realized, thereby improving the user experience.

IPC Classes  ?

• G03B 35/16 - Stereoscopic photography by sequential viewing
• G03B 35/02 - Stereoscopic photography by sequential recording
• G02B 30/54 - Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels the 3D volume being generated by moving a 2D surface, e.g. by vibrating or rotating the 2D surface
• G02B 30/56 - Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels by projecting aerial or floating images
• G02B 26/10 - Scanning systems

Abstract

Provided are a two-dimensional characteristic-based reflective geometric holographic film and a preparation method therefor and the use thereof. The reflective geometric holographic film comprises a primitive film (1) and a plurality of columnar primitive prisms (2) arranged on the surface of the primitive film (1) in an array manner, with the cross sections of the columnar primitive prisms being right-angled triangles, wherein the surfaces on which the hypotenuses of the cross sections of the columnar primitive prisms (2) are located are all attached to the surface of the primitive film (1), and a plurality of transparent layers (11) and reflecting layers (12), which are alternately arranged, are arranged inside the primitive film (1) in the lengthwise directions of the columnar primitive prisms (2); and a layer of a reflecting film (3) is arranged on an inclined plane on which the right-angled side of the cross section of each columnar primitive prism (2) is located, and the error range between the right angle contained in the cross section of each columnar primitive prism (2) and the angle formed by the transparent layer (11), the reflecting layer (12) and the lengthwise direction of the columnar primitive prism (2) is within ±5°. By means of simple two-dimensional characteristic-based cutting and machining, implementation on a large scale is easy to achieve; the primitive film (1) is preferably a flexible primitive film; the product yield is high; and the characteristic of same being flexible enables the two-dimensional characteristic-based reflective geometric holographic film to meet the requirements of folding, winding, storage, etc.

IPC Classes  ?

• G02B 27/00 - Optical systems or apparatus not provided for by any of the groups ,
• G02B 5/32 - Holograms used as optical elements

Abstract

A reflective geometric holographic film based on a two-dimensional feature, and a preparation method therefor and the use thereof. The reflective geometric holographic film comprises a series of prismatic element prisms (3), of which the cross sections are pentagons (2) formed by combining a first right-angled triangle (1) or a rectangle (21) and a second right-angled triangle (22), with the prismatic element prisms being used for carrying out retro-reflection on light irradiated on same; and several transparent layers (31) and reflecting layers (32), which are spaced apart, are arranged in the prismatic element prism (3) in a length direction thereof, a layer of reflecting film (7) is arranged on an inclined plane (6) where a right-angled side of the cross section of the prismatic element prism (3) is located, and an error range of the right angles contained in the first right triangle (1) and the pentagon (2) and an angle formed by the reflecting layer (32) and the length direction of the prismatic element prism (3) is within +/-5°. According to the preparation method, by means of performing simple cutting and machining based on the two-dimensional feature, the process cost is low, large-scale and high-precision production is easily achieved, the element film is preferably a flexible element film, the product yield is high, and due to the flexible feature, the holographic film can meet the requirements of folding and winding for storage.

IPC Classes  ?

• G02B 5/32 - Holograms used as optical elements
• G02B 5/04 - Prisms
• G02B 5/126 - Reflex reflectors including curved refracting surface

Abstract

An all-solid-state holographic photographing device and an all-solid-state holographic projector. The all-solid-state holographic photographing device comprises a photographing lens group (1) and an imaging unit (2) which are provided inside the holographic photographing device, the photographing lens group (1) is used to capture light rays of a scene, and the imaging unit (2) comprises multiple photosensitive chips (21); light rays of the scene at image planes of different depths of field is optically converted by the photographing lens group (1) and the imaging unit (2), and then real image pictures at image planes of different depths of field of the scene are formed on photosensitive chips (21) at corresponding distances and are recorded, the distance between adjacent pixels forming the real image pictures on the photosensitive chips (21) is d (mm), the multiple photosensitive chips (21) are equivalent to a group of equivalent photosensitive surfaces (3) parallel to each other corresponding to the photographing lens group (1), and the distance between any two adjacent equivalent photosensitive surfaces (3) is L (mm), wherein L≥2d. By means of the solution of introducing multiple equivalent photosensitive surfaces (3), the function for photographing a real 3D image is realized, and no moving component is required, greatly improving the reliability and image quality, and also reducing the production cost and the control difficulty.

IPC Classes  ?

• G03B 35/08 - Stereoscopic photography by simultaneous recording
• G09F 19/18 - Advertising or display means not otherwise provided for using special optical effects involving the use of optical projection means, e.g. projection of images on clouds

Abstract

A flexible holographic primitive film, a preparation method therefor and an application thereof. The flexible holographic primitive film (11), taken as a whole, is a flexible bendable film structure, and is composed of a plurality of reflecting layers (12) and transparent layers (13) alternately arranged in parallel. The reflecting layers (12) are reflecting films having a light reflecting function and are used for reflecting light. the transparent layers (13) are used for transmitting light. The flexible holographic primitive film (11) has a horizontal clamping sagging length of L cm and the number of times of folding in half of n, L≥5, or n*L>9. Compared to the existing high-precision optical glass processing technology with the extremely high processing cost, the material cost and the processing cost of the preparation method are low, the flexible holographic primitive film, the preparation method therefor and the application thereof are suitable for large-range popularization, the 3D display holographic film prepared based on the flexible holographic primitive film (11) can be made into a scroll-type screen, a curved screen and the like, the flexibility is relatively high, it is convenient to store when the 3D display holographic film is not used, and the occupied space is relatively small.

IPC Classes  ?

• G02B 5/32 - Holograms used as optical elements

Abstract

Provided in the present application is a holographic display system, comprising an on-site holographic display system, a transmissive geometric holographic display system, a folded optical path geometric holographic display system, and a reflective geometric holographic display system. A display element capable of directly displaying screens provided with depth of field information is used to project a diverging 3D image in the air without the aid of another reference light source. The image is converted by a projection screen of an equivalent negative refractive index flat lens to then obtain an observable 3D image suspended in the air, which reduces costs. At the same time, the 3D image may be displayed in front of or behind the projection screen, the display space is infinite, and in a very small device space, a super large screen and super deep depth of field may also be displayed.

IPC Classes  ?

• G03B 35/18 - Stereoscopic photography by simultaneous viewing
• G02B 30/56 - Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels by projecting aerial or floating images
• G02B 30/54 - Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images the image being built up from image elements distributed over a 3D volume, e.g. voxels the 3D volume being generated by moving a 2D surface, e.g. by vibrating or rotating the 2D surface
• G02B 30/40 - Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images giving the observer of a single two-dimensional [2D] image a perception of depth
• G02B 17/02 - Catoptric systems, e.g. image erecting and reversing system
• G03H 1/12 - Spatial modulation, e.g. ghost imaging
• H04N 13/363 - Image reproducers using image projection screens
• H04N 13/366 - Image reproducers using viewer tracking
• H04N 13/128 - Adjusting depth or disparity
• H04N 13/398 - Synchronisation thereofControl thereof
• H04N 9/31 - Projection devices for colour picture display