CN108803054B - 3D light field display system - Google Patents
3D light field display system Download PDFInfo
- Publication number
- CN108803054B CN108803054B CN201810574335.2A CN201810574335A CN108803054B CN 108803054 B CN108803054 B CN 108803054B CN 201810574335 A CN201810574335 A CN 201810574335A CN 108803054 B CN108803054 B CN 108803054B
- Authority
- CN
- China
- Prior art keywords
- grating
- image
- plane
- light field
- display system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002131 composite material Substances 0.000 claims abstract description 52
- 230000000694 effects Effects 0.000 claims abstract description 14
- 238000009792 diffusion process Methods 0.000 claims description 14
- 238000003384 imaging method Methods 0.000 claims description 7
- 230000000737 periodic effect Effects 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 9
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
- G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
The embodiment of the invention provides a 3D light field display system, which comprises a 2D image generating device and a composite grating; the 2D image generation device is used for projecting a 2D image to the composite grating; the composite grating is a grating structure provided with a cylindrical lens at a slit of the slit grating, and is used for providing a light field with a stereoscopic effect for a 2D image projected by the 2D image generating device so as to form a 3D image. According to the system provided by the embodiment of the invention, the composite grating of the cylindrical lens is arranged at the slit of the slit grating, so that the problem that the resolution is reduced when the viewing angle is increased in the conventional 3D light field display system is solved, and the reduction of the resolution caused by the increase of the pitch is avoided while the viewing angle is increased. Meanwhile, compared with the traditional slit grating, the display brightness of the 3D image is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of light field display, in particular to a 3D light field display system.
Background
With the rapid development of scientific technology, naked eye 3D display has become the mainstream development trend of the display industry, wherein a naked eye 3D display device based on slit grating or cylindrical lens grating can construct viewpoints of three-dimensional objects at different positions in space. Due to the advantages of low cost, simple structure and the like, the naked eye 3D display equipment based on the slit grating or the cylindrical lens grating is high in commercialization degree.
The slit grating 102 based naked eye 3D display system shown in fig. 1, wherein the slit grating 102 acts to control light, can guide light emitted from pixels on the 2D display screen 101 to different positions in space. The viewpoint in fig. 1 refers to different side information of the three-dimensional object respectively seen at different positions in space. However, the above display method has some disadvantages, for example, a single image synthesized by acquiring 4 different side information of any three-dimensional model contains information of 4 viewpoints, so that the resolution of each viewpoint is reduced 1/4. And because the slit grating shields most of the light, the display mode based on the slit grating has low brightness.
Such as the lenticular lens grating 202 based naked eye 3D display system shown in fig. 2, where the lenticular lens grating 202 functions as the slit grating 102 of fig. 1. However, since the cylindrical lens can transmit light, the brightness of the lenticular lens 202 is higher than that of the slit grating 102, and the principle is to control the light by refraction when the light passes through the cylindrical lens. However, the resolutions of the two display modes are decreased with the increase of the viewpoint, and the viewing angles are 2arctanp/2g, where p is the pitch of the slit grating 102 or the lenticular lens 202, and g is the distance from the slit grating 102 or the lenticular lens 202 to the 2D display screen 101.
However, if the viewing angle is increased by increasing the pitch p only, other negative effects such as increased graininess and decreased resolution may be brought about. As shown in fig. 3, since the 2D display screen 101 is placed on the back focal plane of the cylindrical lenses 302, the light emitted by the pixels after passing through the cylindrical lenses 302 will be a parallel light beam with a width equal to the pitch of the cylindrical lenses, and only one pixel can be viewed by the human eye 303 through one cylindrical lens 302, the number of the cylindrical lenses 302 decreases as the pitch of the cylindrical lenses increases, so the resolution decreases.
Disclosure of Invention
The embodiment of the invention provides a 3D light field display system, which is used for solving the problem that the resolution is reduced when the visual angle of the existing 3D light field display system is increased.
The embodiment of the invention provides a 3D light field display system, which comprises a 2D image generating device and a composite grating; the 2D image generation device is used for projecting a 2D image to the composite grating; the composite grating is a grating structure provided with a cylindrical lens at the slit of the slit grating, and the composite grating is used for enabling the 2D image projected by the 2D image generating device to form an optical field with a three-dimensional effect so as to form a 3D image.
According to the 3D light field display system provided by the embodiment of the invention, the composite grating of the cylindrical lens is arranged at the slit of the slit grating, so that the problem that the resolution is reduced when the viewing angle of the conventional 3D light field display system is increased is solved, the viewing angle is increased, and the reduction of the resolution caused by the increase of the pitch is avoided. Meanwhile, compared with the traditional slit grating, the display brightness of the 3D image is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a slit grating-based naked eye 3D display system in the prior art;
FIG. 2 is a schematic diagram of a naked eye 3D display system based on a lenticular lens grating in the prior art;
FIG. 3 is a schematic diagram of a naked eye 3D display system based on a lenticular lens grating in the prior art;
FIG. 4 is a schematic structural diagram of a 3D light field display system according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a composite grating according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a 3D light field display system according to an embodiment of the present invention;
wherein,
101-2D display screen; 102-a slit grating; 202-cylindrical lenticulation;
302-cylindrical lens; 303-human eye; 401-2D image generating device;
402-a composite grating; 403-3D images; 501-cylindrical lens;
502-a light-shielding portion; 601-a first projector; 602-a second projector;
603-a third projector; 604-vertical diffusion membrane.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 4 is a schematic structural diagram of a 3D light field display system according to an embodiment of the present invention, and as shown in fig. 4, the 3D light field display system includes a 2D image generation device 401 and a composite grating 402; the 2D image generation device 401 is configured to project a 2D image onto the composite grating 402; the composite grating 402 is a grating structure in which a cylindrical lens is disposed at a slit of a slit grating, and the composite grating 402 is used for enabling a 2D image projected by the 2D image generation device 401 to form a light field with a stereoscopic effect so as to form a 3D image.
Specifically, the 2D image generation device 401 may be a 2D display screen, or may be a device such as a projector capable of projecting images to the outside, and the 2D image generation device 401 may be a single display screen or a projector, or may be a combination of multiple 2D display screens and/or projectors, and the embodiment of the present invention does not specifically limit the type and number of the 2D image generation devices 401.
The composite grating 402 corresponds to a combination of a conventional slit grating and a cylindrical lens grating. Fig. 5 is a schematic structural diagram of a composite grating 402 according to an embodiment of the present invention, and as shown in fig. 5, the composite grating 402 is composed of a cylindrical lens 501 and a light shielding portion 502. The composite grating 402 increases the slit of the slit grating relative to the slit grating constituted by the slits between the light shielding portion 502 and the light shielding portion 502, and the lenticular lens 501 is provided at the slit.
Further, in the embodiment of the present invention, the 2D image generation device 401 and the composite grating 402 cooperate to generate a 3D image.
In the embodiment of the invention, the composite grating 402 of the cylindrical lens is arranged at the slit of the slit grating, so that the problem that the resolution is reduced when the viewing angle is increased by the conventional 3D light field display system is solved, and the reduction of the resolution caused by the increase of the pitch is avoided while the viewing angle is increased. Meanwhile, compared with the traditional slit grating, the display brightness of the 3D image is improved.
Based on the above embodiments, in a 3D light field display system, the 2D image generation device 401 is arranged on a first plane, the composite grating 402 is arranged on a second plane, and the first plane is parallel to the second plane, that is, the plane where the 2D image generation device 401 is located is parallel to the plane where the composite grating 402 is located. Similarly, the plane where the 2D image generating device 401 is located is parallel to the imaging plane where the 2D image generating device 401 emits the 2D image, and the imaging plane where the 2D image generating device 401 emits the 2D image is parallel to the plane where the composite grating 402 is located.
In the embodiment of the invention, the first plane and the second plane are arranged in parallel, so that the improvement of the 3D image display effect of the 3D light field display system is facilitated.
Based on any of the above embodiments, a 3D light field display system, the 2D image generation device 401 is a projector array, the projector array includes a plurality of projectors, and the plurality of projectors are uniformly and equidistantly arranged on a first straight line of a first plane.
Each of the projectors is configured to project a 2D image onto the composite grating 402, and each of the projectors emits directional light. Each projector is capable of projecting information for several viewpoints. In the plurality of projectors, the viewpoints corresponding to the information projected by any two projectors are different. In the projector array, the 2D image projected by each projector forms an imaging plane of the projector array before being projected onto the composite grating 402, so that the imaging plane of the projector array is located between the projector array and the composite grating 402, and the imaging plane of any projector is independent. Several of the embodiments of the present invention refer to one or more. And the plurality of viewpoints can respectively see different side information of the three-dimensional object at different positions in the space.
Further, in the embodiment of the present invention, the projectors are arranged at equal intervals, so that the 2D images projected by the projector array can be uniformly projected on the composite grating 402, and the 3D light field display system provided in the embodiment of the present invention can provide a better display effect.
In the embodiment of the invention, the projector array is arranged to comprise a plurality of projectors, so that the system has higher resolution and wider viewing angle compared with the prior art under the condition of increasing viewpoints, the problem that the number of viewpoints and the resolution form a mutual restriction relationship in the prior art is solved, and a 3D image with better effect can be displayed.
Based on any of the above embodiments, a 3D light field display system, the first line is parallel to the periodic structure of the composite grating. The composite grating has a periodic structure, and the directions of the reflection, transmission and diffraction of light by the composite grating are all the same as the direction of the periodic structure.
Based on any one of the above embodiments, a 3D light field display system further includes a vertical diffusion film for diffusing light rays in a light field having a stereoscopic effect in a vertical direction; the vertical diffusion film is positioned on a third plane, and the third plane is parallel to the first plane and the second plane; the first plane, the second plane and the third plane are arranged in sequence.
Specifically, the vertical diffusion film is obtained by a light interference method, and is an optical device capable of diffusing light rays in a light field with a stereoscopic effect emitted by the composite grating 402 by a preset angle in a vertical direction without affecting the light rays in a horizontal direction. It should be noted that the diffusion angle of the vertical diffusion film may be determined according to the actual requirements of the 3D light field display system, and this is not specifically limited in the embodiment of the present invention.
The operation principle of the 3D light field display system in the embodiment of the invention is as follows:
first, a 2D image is emitted from the 2D image generating device 401 and projected on the composite grating 402. Subsequently, the 2D image projected by the 2D image generation device 401 passes through the composite grating 402 to form a light field with a stereoscopic effect. Then, after the light in the light field with the stereoscopic effect formed by the composite grating 402 is diffused in the vertical direction by a preset angle through the vertical diffusion film, a 3D image is formed.
In the embodiment of the invention, the vertical diffusion film is additionally arranged, so that the problem that the divergence angle of the light of the 2D image projected by the 2D image generating device is small is solved, and a viewer can be ensured to view the 3D image displayed by the 3D light field display system in the whole vertical direction.
Based on any of the above embodiments, a 3D light field display system, the viewing angle of the 3D light field display system is:
wherein,
for viewing angle, N is the number of projectors in the projector array, p is the pitch of the composite grating, and g is the distance between the composite grating and the imaging plane of the projector array.
Specifically, a plurality of projectors collectively form a plurality of viewpoints in space, and if the lateral resolution of the projector is M, the resolution of the three-dimensional image finally displayed is reduced to only M/N. The viewing angle of the 3D light field display system is also increased by a factor of N.
For a better understanding and application of a 3D light field display system proposed by the present invention, the following examples are made and the present invention is not limited to the following examples.
Fig. 6 is a schematic structural diagram of a 3D light field display system in an embodiment of the present invention, and as shown in fig. 6, the 3D light field display system includes a projector array, a composite grating 402, and a vertical diffusion film 604.
Wherein the projector array is composed of 3 equidistantly arranged projectors, and the 3D light field display system in this example has 18 viewpoints, and each projector projects an image including information of 6 viewpoints. Specifically, the 2D image projected by the first projector 601 includes information of viewpoints 13, 14, 15, 16, 17, and 18, the 2D image projected by the second projector 602 includes information of viewpoints 7, 8, 9, 10, 11, and 12, and the 2D image projected by the third projector 603 includes information of viewpoints 1, 2, 3, 4, 5, and 6.
Thus, the 2D image projected by the first projector 601 passes through the composite grating 402 and the vertical diffusion film 602 to form viewpoints 13, 14, 15, 16, 17, and 18 in space, the 2D image projected by the second projector 602 passes through the composite grating 402 and the vertical diffusion film 604 to form viewpoints 7, 8, 9, 10, 11, and 12 in space, and the 2D image projected by the third projector 603 passes through the composite grating 402 and the vertical diffusion film 604 to form viewpoints 1, 2, 3, 4, 5, and 6 in space. Thus, the three projectors collectively construct a 3D video image including 18 viewpoints in a space.
If the horizontal resolution of the projector is M, the resolution of the finally displayed 3D image is only reduced to M/6, which is 3 times higher than that of the conventional method. The viewing perspectives of the 3D light field display system in this example are:
from the above, the viewing angle of the 3D light field display system in this example is improved by a factor of 3 compared to the conventional light field display system.
Here, the arrangement of the projector array is illustrated by 3 projectors in fig. 6, and the other number of projectors can be analogized, where the first projector 601, the second projector 602, and the third projector 603 are disposed at the longitudinal distance of the complex grating 402L + g, and the 2D images projected by the above projection are all imaged at the longitudinal direction L from the projector array. The first projector 601 and the third projector 603 are located at a distance d ═ pL/g from the second projector 602 in the lateral direction, where p is the pitch of the composite grating 402.
In this example, the composite grating 402 with the cylindrical lenses arranged at the slits of the slit grating solves the problem that the existing 3D light field display system may cause the resolution to be reduced when the viewing angle is increased, and ensures that the viewing angle is increased and the resolution is not reduced due to the increase of the pitch. Meanwhile, compared with the traditional slit grating, the display brightness of the 3D image is improved.
Secondly, through setting up the projecting apparatus array and including a plurality of projectors, can be under the condition that the sight is increased, compare in prior art, have higher resolution ratio and wider viewing angle, solved the sight number that exists among the prior art and resolution ratio and formed the relation of mutual restriction, can show the 3D image of better effect.
Thirdly, the projectors are arranged at equal intervals, so that the 2D images projected by the projector array can be uniformly projected on the composite grating 402, and the 3D light field display system provided by the embodiment of the invention can provide a better display effect.
Finally, the vertical diffusion film 604 is additionally arranged, so that the problem that the divergence angle of 2D image light projected by the 2D image generating device is small is solved, and a viewer can view a 3D image displayed by the 3D light field display system in the whole vertical direction.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A3D light field display system is characterized by comprising a 2D image generation device and a composite grating;
the 2D image generation device is used for projecting a 2D image to the composite grating;
the composite grating is a grating structure provided with a cylindrical lens at a slit of the slit grating, and the composite grating is used for enabling the 2D image projected by the 2D image generating device to form a light field with a three-dimensional effect so as to form a 3D image;
the 2D image generation device is arranged on a first plane, the composite grating is arranged on a second plane, and the first plane is parallel to the second plane;
the 2D image generation device is a projector array, the projector array comprises a plurality of projectors, and the projectors are uniformly and equidistantly arranged on a first straight line of the first plane;
the viewing angles of the 3D light field display system are:
wherein,
and in order to view the visual angle, N is the number of projectors in the projector array, p is the pitch of the composite grating, and g is the distance between the composite grating and the imaging surface of the projector array.
2. The system of claim 1, wherein the first line is parallel to a periodic structure of the composite grating.
3. The system of claim 1, further comprising a vertical diffuser film for diffusing light rays in the stereotactic light field in a vertical direction;
the vertical diffusion film is located on a third plane, and the third plane is parallel to the first plane and the second plane;
the first plane, the second plane and the third plane are arranged in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810574335.2A CN108803054B (en) | 2018-06-06 | 2018-06-06 | 3D light field display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810574335.2A CN108803054B (en) | 2018-06-06 | 2018-06-06 | 3D light field display system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108803054A CN108803054A (en) | 2018-11-13 |
| CN108803054B true CN108803054B (en) | 2020-06-19 |
Family
ID=64087390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810574335.2A Active CN108803054B (en) | 2018-06-06 | 2018-06-06 | 3D light field display system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108803054B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459865B (en) * | 2018-11-20 | 2024-03-26 | 成都航空职业技术学院 | 3D display device |
| CN109283693B (en) * | 2018-12-06 | 2023-11-24 | 成都工业学院 | Light field stereoscopic display device based on light-emitting diode packaging unit |
| CN114355623B (en) * | 2022-03-14 | 2022-05-17 | 成都工业学院 | One-dimensional retro-reflection sheet for projection light field stereoscopic display |
| CN114326273B (en) * | 2022-03-16 | 2022-05-13 | 成都工业学院 | Projector array positioning device for light field expansion |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819375B (en) * | 2010-04-16 | 2012-05-30 | 浙江大学 | Total parallax three-dimensional display device |
| TW201312161A (en) * | 2011-09-07 | 2013-03-16 | Ind Tech Res Inst | Stereoscopic display system and screen module |
| CN102591124A (en) * | 2012-02-21 | 2012-07-18 | 浙江大学 | Transverse wide-visual field tridimensional display method and system based on spliced light field |
| CN104834174B (en) * | 2014-02-12 | 2018-02-27 | 台达电子工业股份有限公司 | Stereoscopic display device is with applying its stereo display method |
| CN204989640U (en) * | 2015-06-29 | 2016-01-20 | 张家港康得新光电材料有限公司 | What comes into a driver's discrete device and 3D display device |
-
2018
- 2018-06-06 CN CN201810574335.2A patent/CN108803054B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108803054A (en) | 2018-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108803054B (en) | 3D light field display system | |
| CN108803053B (en) | Three-dimensional light field display system | |
| CN108008540B (en) | A kind of three-dimensional display system | |
| US9310769B2 (en) | Coarse integral holographic display | |
| CN109343229B (en) | Stereoscopic display device for far vision | |
| CN110012286B (en) | High-viewpoint-density human eye tracking stereoscopic display device | |
| CN110716322B (en) | Display system and display method for desktop three-dimensional orientation | |
| CN108828893A (en) | Three-dimensional display system based on Lenticular screen | |
| CN103562963A (en) | Systems and methods for alignment, calibration and rendering for an angular slice true-3D display | |
| US20150070478A1 (en) | 3D Display Method | |
| CN108919503B (en) | Integrated imaging 360-degree desktop 3D display system based on visual angle guide layer | |
| US20140160563A1 (en) | Image display apparatus | |
| US9958691B2 (en) | Multi-view display device | |
| JP2017010014A (en) | Image display device | |
| CN108319030B (en) | Free stereo display system | |
| US3688045A (en) | Method for photographing and reproducing three-dimensional images | |
| US20080259281A1 (en) | Apparatus and method for displaying three-dimensional image | |
| US20150215609A1 (en) | Time-Multiplexed Multiple View Projection Apparatus | |
| JP4728825B2 (en) | 3D image display device | |
| CN105759431B (en) | A kind of 3 d light fields display system | |
| CN111193921B (en) | LED screen one-dimensional integrated imaging display method based on combined discrete grating | |
| CN108061972B (en) | Curved surface light field display system | |
| Kikuta et al. | Development of SVGA resolution 128-directional display | |
| JP2011197675A (en) | Projection system | |
| CN108803055A (en) | Three-dimensional display system based on slit grating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |