CN113589547A - Curved surface transmission type 3D light field display system based on projection array - Google Patents
Curved surface transmission type 3D light field display system based on projection array Download PDFInfo
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- CN113589547A CN113589547A CN202110855554.XA CN202110855554A CN113589547A CN 113589547 A CN113589547 A CN 113589547A CN 202110855554 A CN202110855554 A CN 202110855554A CN 113589547 A CN113589547 A CN 113589547A
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- 230000005540 biological transmission Effects 0.000 title abstract description 15
- 230000003287 optical effect Effects 0.000 description 12
- 238000003384 imaging method Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 241000282412 Homo Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B35/00—Stereoscopic photography
- G03B35/18—Stereoscopic photography by simultaneous viewing
- G03B35/20—Stereoscopic photography by simultaneous viewing using two or more projectors
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Abstract
The invention relates to a curved surface transmission type 3D light field display system based on a projection array, which comprises the projection array, a curved surface reflector and a screen, wherein the projection array comprises a plurality of projectors which are arranged on an arc section support, the curved surface reflector is arranged on a light path of the projection array, and light rays emitted by the projectors are reflected to the screen through the curved surface reflector and are transmitted to the other surface of the screen to be projected to generate a three-dimensional image. According to the curved surface transmission type 3D light field display system, the curved surface reflector is arranged on the light path of the projection array, light rays emitted by the projector are reflected to the screen and transmitted to the other surface of the screen to be projected to generate a three-dimensional image, the projection distance is increased, the breadth of the display system is expanded under the condition that the occupied area is not increased, the three-dimensional space is fully utilized, the size is small, and the carrying and the use are convenient.
Description
Technical Field
The invention relates to the technical field of 3D display, in particular to a curved surface transmission type 3D light field display system based on a projection array.
Background
In 3D display systems, 3D display can be divided into two broad categories; binocular parallax 3D display and true 3D display. The true 3D display refers to more fully invoking stereoscopic vision characteristics of human eyes and truly restoring the impression of human eyes when observing a natural three-dimensional scene, so that the key point of such technologies is to actually image display contents in a space in a feasible optical manner.
At present, the 3D light field display technology based on projection array is a mature true 3D display technology. The projector arrays are arranged in a certain radian and project to a certain area of the screen. The projectors at different positions project the view field images in the direction, the images are fused at the screen, and the light field of the images is vertically diffused by the holographic diffusion film at the screen, so that viewers at different distances can correctly observe the three-dimensional images. Thus, a 3D light field display system based on a projection array provides a horizontal field of view pair by a projector arc arrangement, with the holographic diffuser film supplementing the vertical information.
Depending on the viewing position of the viewer, 3D light field display systems can be divided into transmissive and reflective. The observer and the projector array are respectively positioned on different sides of the screen and are in a transmission type; the viewer and projector arrays are each reflective on the same side of the screen. The image of the transmission type layout is brighter, and the method can be suitable for places with higher brightness, such as outdoors; and the background of the image in the reflective layout is clearer and the brightness is relatively darker.
The breadth of the existing 3D light field display system is limited by the projection ratio (the ratio of the projection distance to the picture width) of the projector, and a small projection ratio is difficult due to the need to ensure image quality. If a larger format is required, a larger throw distance is required, which results in a larger footprint for the 3D light field display system.
Therefore, the prior art has yet to be developed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a projection array-based curved surface transmission type 3D light field display system, and aims to solve the problems that the existing projection occupies a large space or has a small projection breadth.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a projection array-based curved surface transmission-type 3D light field display system which comprises a projection array, a curved surface reflector and a screen, wherein the projection array comprises a plurality of projectors arranged on an arc section support, the curved surface reflector is arranged on a light path of the projection array, and light rays emitted by the projectors are reflected to the screen through the curved surface reflector and are transmitted to the other surface of the screen to be projected to generate a three-dimensional image.
Further, the curved reflecting mirror is a convex mirror or a concave mirror.
Further, when the curved reflecting mirror is a concave mirror, the projector is located in a focal range of the concave mirror.
Further, the radius of curvature of the concave mirror is greater than 2 times the distance from the projector to the concave mirror.
Further, the center of curvature of the concave mirror is located above the projector.
Further, the concave mirror is a cylindrical concave mirror or a spherical concave mirror.
Further, adjacent projectors are spaced 1 ° to 2 ° apart along the arc segment support center.
Further, the projector is symmetrical left and right along the center line of the curved reflector.
Further, a holographic diffusion film is arranged on the screen.
The projection array and the curved surface reflector are mounted in the mounting cabinet, and the screen is mounted on the surface of the mounting cabinet.
The technical scheme of the invention has the following beneficial effects:
according to the curved surface transmission type 3D light field display system, the curved surface reflector is arranged on the light path of the projection array, light rays emitted by the projector are reflected to the screen and transmitted to the other surface of the screen to be projected to generate a three-dimensional image, the projection distance is increased, the breadth of the display system is expanded under the condition that the occupied area is not increased, the three-dimensional space is fully utilized, the size is small, and the carrying and the use are convenient.
Drawings
FIG. 1 is a schematic structural diagram of a curved surface transmissive 3D light field display system according to the present invention;
FIG. 2 is a schematic view of an optical path without a curved mirror;
FIG. 3 is a schematic view of the optical path of a mounted curved mirror;
FIG. 4 is a schematic top view of a system of a spherical concave mirror;
FIG. 5 is a schematic top view of a system of cylindrical concave mirrors;
FIG. 6 is a schematic diagram of the optical path of the first embodiment of the present invention;
fig. 7 is a schematic diagram of the optical path of a second embodiment of the present invention.
Description of reference numerals:
100-curved surface transmission type 3D light field display system, 101-installation cabinet, 10-projection array, 11-arc section support, 20-curved surface reflector and 30-screen.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the specific embodiments described herein are only for explaining the present invention and are not intended to limit 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.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "connected" may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1, the present invention provides a curved surface transmission type 3D light field display system 100 based on a projection array 10, including a projection array 10, a curved surface reflector 20 and a screen 30, where the projection array 10 includes a plurality of projectors mounted on an arc segment support 11, the curved surface reflector 20 is disposed on a light path of the projection array 10, and light emitted by the projectors is reflected to the screen 30 through the curved surface reflector 20 and is transmitted to another surface of the screen 30 to generate a three-dimensional image through projection. In use, the position of the three-dimensional image viewed by the user and the position of the projector are located on different sides of the screen 30.
According to the curved surface transmission type 3D light field display system 100, the curved surface reflector 20 is arranged on the light path of the projection array 10, light rays emitted by the projector are reflected to the screen 30 and transmitted to the other surface of the screen 30 to be projected to generate a three-dimensional image, so that the projection distance is increased, the breadth of the display system is expanded under the condition that the floor area is not increased, and the three-dimensional space is fully utilized. The curved surface transmission type 3D light field display system 100 of the present invention is small in size and convenient to carry and use.
As shown in fig. 2, when the curved reflector 20 is not used in the conventional projection imaging, since the projector array is arranged in an arc, the optical center of the projector array is aligned with the center of the screen 30, and the imaging focal point of the actual projector is located on the dashed arc near the screen 30 according to the optical path difference of the imaging. Because of the limit of the resolution of human eyes, the pixels which are out of focus are not perceived, although clear images can be observed, the situation is more obvious when the breadth is larger and the edge is more obvious, and the imaging depth of field is severely limited.
The present invention can compensate for parallax by using the curved mirror 20. As shown in fig. 3, the dashed line indicates the focus of the projection array 10 at this position when no mirror is present. The projectors in different positions of the invention utilize the curvature of the curved reflector 20 to compensate the optical path: the projectors located at the edge reach the curved mirror 20 in advance, and the optical path thereof is reduced, thereby compensating the optical path, reaching the compensated parallax, and further reducing the defocusing condition.
In this embodiment, the curved reflector 20 is a convex mirror or a concave mirror, and only the position and the inclination angle of the convex mirror or the concave mirror need to be properly adjusted, so that the light projected by the projector is reflected by the curved reflector 20 and then is completely imaged on the screen 30.
Preferably, the concave mirror is a cylindrical concave mirror or a spherical concave mirror.
As shown in fig. 4 and 5, they are schematic top view light paths of the spherical concave mirror and the cylindrical concave mirror, respectively. The light emitted from the projector is reflected by the curved mirror 20 and then projected onto the screen 30, thereby generating a three-dimensional scene at the screen 30. Since all projectors project onto the same display area and the projector images at different positions are different, the projection range of the projectors is limited, or the projection area of the projectors is limited (generally, the projector is operated to set the image portion projected outside the limited area to black or white).
As shown in fig. 4, for example, if the whole width of the projector is used and the edge rays are shown as dotted lines in the figure, the edge rays may exceed the size of the curved mirror 20 and cannot be reflected onto the screen 30; the shadow part in the figure is that the light of the projector can be irradiated on the screen 30 by reflection, so the shadow part can be called as an effective reflection area, which corresponds to the effective projection area of the projector.
The upper and lower light rays (thicker light rays in fig. 4) of the projector are irradiated to the upper and lower boundaries of the screen 30 through the curved mirror 20. In this way, by limiting the projection range of the projectors and the size of the screen 30, it is achieved that all projectors image at the screen 30.
The boundaries of the effective projection areas of the other projectors are shown as thin solid rays in fig. 4, from which it can be seen that the effective projection area and the effective reflection area of each projector are different.
Due to the optical characteristics of the concave mirror, the light rays at the focal point of the concave mirror are emitted in parallel. When the curved reflecting mirror 20 is a concave mirror, if the projector is used as a point light source and is placed at the focus of the concave mirror, the light of the projector is reflected by the concave mirror and is emitted in parallel.
According to the object-image relationship 1/lo+1/li1/f, whereino、liF is the object distance, image distance and focal distance, respectively, and the object distance loGreater than focal length liThe light must be focused on the other side of the focal length.
When the projector is out of the focal distance of the concave mirror, the light of the projector is focused at one position, so that the breadth of the projector is reduced, and the concave mirror plays a role in reducing; when the object distance loLess than focal length liWhen the projection device is used, the image distance and the object distance have different signs, the image distance is located on the other side of the concave mirror, light rays are diffused, and the breadth of the projector is increased.
Therefore, in order to extend the breadth of the display system, the projector must be placed in the focal range of the concave mirror in use.
Since the focal length of the concave mirror is approximately equal to half of the curvature radius of the concave mirror, the curvature radius of the concave mirror is greater than 2 times the distance from the projector to the concave mirror. Meanwhile, in order to realize the deflection of the light rays to the upper side of the projector, the curvature center of the concave mirror is positioned above the projector.
Fig. 6 shows a first embodiment of the curved transmissive 3D light field display system 100 of the present invention, in which the user views the screen 30 in a direction opposite to the exit direction of the projector. Fig. 7 shows a second embodiment of the curved transmissive 3D light field display system 100 of the present invention, in which the direction of the user viewing the screen 30 coincides with the exit direction of the projector.
The first embodiment can achieve a larger projection area when the same curved mirror 20 and projection array 10 are used, while the second embodiment can better control the proportion of the projected image. If the inclination angle of the screen 30, the inclination angle and the curvature radius of the curved surface reflector 20 are properly set, and the optical paths of the upper and lower light rays projected to the screen 30 by the projector meet the projection ratio of the projector, it is easier to calibrate the image and control the image range.
Before use, projection calibration needs to be performed on each projector, so that projection pictures of all projectors at the screen 30 are overlapped and displayed normally, projection transformation of the projectors is obtained and used for preprocessing a projection source, the projectors can be used after the projection source is processed, and at the moment, three-dimensional imaging can be observed at the screen 30.
In this embodiment, the circular arc arrangement of the projectors provides a horizontal field of view pair, and the screen 30 is provided with a holographic diffuser film for supplementing vertical information. Since the human eye grows horizontally, the most basic method for providing three-dimensional information to humans is to implement horizontal parallax pairs. The projectors at different positions project the field images in the direction, the images are fused at the screen 30, and the image light field is vertically diffused by the holographic diffusion film at the screen 30, so that viewers at different distances can correctly observe the three-dimensional images.
In the present embodiment, the projector may be attached to the horizontal arc segment support 11, or may be attached to the oblique arc segment support 11.
Since the reflective range of the curved mirror 20 is limited, the projection range of the projector can be limited by the size of the curved mirror 20 in order to ensure that all projectors project into the area of the screen 30.
As an embodiment, the adjacent projectors are spaced by 1 ° to 2 ° along the center of the arc segment support 11, or a reasonable angle is set according to actual requirements. If the horizontal viewing angle of the curved surface transmission type 3D light field display system 100 is 60 degrees and the interval between adjacent projectors is 1 °, at least 60 projectors are required.
Preferably, the projector is left-right symmetric along the center line of the curved mirror 20.
Further, the curved surface transmission type 3D light field display system 100 of the present invention further includes an installation cabinet 101, the projection array 10 and the curved surface reflector 20 are installed in the installation cabinet 101, and the screen 30 is installed on the surface of the installation cabinet 101, so as to form a whole, which is convenient for carrying and using, and is not easy to be damaged and swayed.
The above examples of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications which are obvious to the technical scheme of the invention are covered by the protection scope of the invention.
Claims (10)
1. The utility model provides a curved surface transmission-type 3D light field display system based on projection array, its characterized in that, includes projection array, curved surface speculum and screen, the projection array includes that a plurality of installs the projecting apparatus on the circular arc section support, the curved surface speculum set up in the light path of projection array, the light that the projecting apparatus sent passes through the curved surface speculum reflects extremely screen department to transmit extremely the another side projection of screen generates three-dimensional image.
2. The curved transmissive 3D light field display system according to claim 1, wherein the curved mirror is a convex mirror or a concave mirror.
3. The curved transmissive 3D light field display system according to claim 2, wherein when a concave mirror is used as the curved reflective mirror, the projector is located within a focal range of the concave mirror.
4. The curved transmissive 3D light field display system according to claim 3, wherein the radius of curvature of the concave mirror is larger than 2 times the distance of the projector to the concave mirror.
5. The curved transmissive 3D light field display system according to claim 3, wherein the center of curvature of the concave mirror is located above the projector.
6. The curved transmissive 3D light field display system according to claim 3, wherein the concave mirror is a cylindrical concave mirror or a spherical concave mirror.
7. The curved transmissive 3D light field display system of claim 1, wherein adjacent projectors are spaced 1 ° to 2 ° along the arc segment support center.
8. The curved transmissive 3D light field display system of claim 1, wherein the projector is left-right symmetric along a center line of the curved mirror.
9. The curved transmissive 3D light field display system of claim 1, wherein a holographic diffuser film is disposed on the screen.
10. The curved transmissive 3D light field display system of claim 1 further comprising a mounting cabinet, wherein said projection array and curved mirror are mounted within said mounting cabinet, and wherein said screen is mounted on a surface of said mounting cabinet.
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| CN202110855554.XA CN113589547A (en) | 2021-07-28 | 2021-07-28 | Curved surface transmission type 3D light field display system based on projection array |
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| CN202110855554.XA CN113589547A (en) | 2021-07-28 | 2021-07-28 | Curved surface transmission type 3D light field display system based on projection array |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114779494A (en) * | 2022-06-17 | 2022-07-22 | 深圳市文生科技有限公司 | Imaging element and imaging device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060291051A1 (en) * | 2004-12-31 | 2006-12-28 | Eun-Soo Kim | Three-dimensional display device |
| CN103777453A (en) * | 2012-10-25 | 2014-05-07 | 耿征 | True 3D image display system and display method |
| CN107561846A (en) * | 2017-09-27 | 2018-01-09 | 李正云 | High transmission rate back projection splicing screen and its manufacture method |
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2021
- 2021-07-28 CN CN202110855554.XA patent/CN113589547A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060291051A1 (en) * | 2004-12-31 | 2006-12-28 | Eun-Soo Kim | Three-dimensional display device |
| CN103777453A (en) * | 2012-10-25 | 2014-05-07 | 耿征 | True 3D image display system and display method |
| CN107561846A (en) * | 2017-09-27 | 2018-01-09 | 李正云 | High transmission rate back projection splicing screen and its manufacture method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114779494A (en) * | 2022-06-17 | 2022-07-22 | 深圳市文生科技有限公司 | Imaging element and imaging device |
| CN114779494B (en) * | 2022-06-17 | 2022-09-02 | 深圳市文生科技有限公司 | Imaging element and imaging device |
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Application publication date: 20211102 |