CN108803058B - Holographic display system, imaging method thereof and holographic three-dimensional display system - Google Patents
Holographic display system, imaging method thereof and holographic three-dimensional display system Download PDFInfo
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- CN108803058B CN108803058B CN201810622482.2A CN201810622482A CN108803058B CN 108803058 B CN108803058 B CN 108803058B CN 201810622482 A CN201810622482 A CN 201810622482A CN 108803058 B CN108803058 B CN 108803058B
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
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Abstract
The invention discloses a holographic display system, which comprises a display device, a total reflection device and a retroreflection device, wherein the display device is used for displaying an image to be holographically displayed, and light rays emitted by the display device irradiate on the total reflection device; the total reflection device is used for reflecting all the light rays irradiated by the display device to the retroreflection device; the retroreflection device is of an inwards concave arc-shaped structure and is used for changing the angle of light rays so that the light rays reflected by the total reflection device are totally retroreflected and pass through the total reflection device to form a holographic virtual image. The invention has the beneficial effects that: the holographic display system combines the total reflection and the retroreflection principle, holographic display can be realized without using holographic glass as an optical propagation medium or quadrangular pyramid-shaped glass, a holographic displayed virtual image is not limited by a display space, and the holographic display system is simple in structure and easy to realize.
Description
Technical Field
The invention relates to the technical field of holographic display, in particular to a holographic display system, an imaging method thereof and a holographic three-dimensional display system.
Background
The holographic projection technology, also called virtual imaging technology, is a technology for recording and reproducing a real three-dimensional image of an object by utilizing the interference and diffraction principles, and the first step is to record object light wave information by utilizing the interference principle, namely, the shooting process is that a shot object forms a diffusion type object beam under the irradiation of laser; the other part of laser as reference beam is emitted to the holographic film to be overlapped with the object beam to generate interference, and the phase and amplitude of each point on the object light wave are converted into the intensity which is changed in space, so that the contrast and the interval between the interference fringes are utilized to record all the information of the object light wave, and the film with the interference fringes is processed by developing, fixing and other processing procedures to form a hologram, or hologram; the hologram is just like a complex grating, under the irradiation of coherent laser, the diffracted light wave of a linearly recorded sine hologram can generally give two images, namely an original image (also called an initial image) and a conjugate image, the reproduced image has strong stereoscopic impression and real visual effect, and each part of the hologram records the light information of each point on the object, so that each part of the hologram can reproduce the whole image of the original object in principle, and a plurality of different images can be recorded on the same film through multiple exposures and can be respectively displayed without mutual interference.
The current commonly used scheme of holographic display generally adopts holographic glass as a light propagation medium, and because glass is needed, the virtual image is isolated from a user by the glass, so that the user cannot touch or penetrate the image of the virtual display, and the mysterious feeling of the technology is reduced. Secondly, the holographic glass solution is required to be used in a wide range at present, and the freshness of a user for a display mode using the holographic glass is reduced.
Disclosure of Invention
In view of the defects in the prior art, it is an object of the present invention to provide a holographic display system that can realize holographic display without using holographic glass as an optical propagation medium.
In a first aspect, an embodiment of the present invention provides a holographic display system, including a display device, a total reflection device, and a retro-reflection device, where the display device is configured to display an image to be holographically displayed, and the display device emits light to irradiate the total reflection device; the total reflection device is used for reflecting all the light rays irradiated by the display device to the retroreflection device; the retroreflection device is of an inwards concave arc-shaped structure and is used for changing the angle of light rays so that the light rays reflected by the total reflection device are totally retroreflected and pass through the total reflection device to form a holographic virtual image.
Optionally, a reflective grating film is disposed on a surface of the total reflection device close to the display device, and an absorptive grating film is disposed on a surface of the total reflection device far from the display device.
Alternatively, the retroreflection device is formed by closely arranging a plurality of mediums with retroreflection performance, and a coating layer is arranged on the reflection surface of each medium.
Optionally, the retro-reflective means comprises a plurality of prismatic media, the reflective surfaces of which are provided with a coating.
Optionally, the total reflection device is made of glass.
In a second aspect, an imaging method of a holographic display system provided by an embodiment of the present invention is applicable to the holographic display system of the above embodiment, and the imaging method includes:
the light emitted by the display device is incident on a first surface of the total reflection device to form a first incident angle, and the first incident angle is larger than or equal to a total reflection critical angle of the total reflection device;
the total reflection device totally reflects the reflected light to the retroreflection device to form a second incidence angle;
the retroreflection device reflects the light to the first surface of the total reflection device, the retroreflected light passes through the total reflection device, and a holographic virtual image is formed in a space outside the opposite surface of the first surface of the total reflection device.
In a third aspect, an embodiment of the present invention further provides a holographic stereoscopic display system, including a total reflection device, a display device, and a retro-reflection device, where the retro-reflection device is an inward-concave arc-shaped structure, the display device and the retro-reflection device are located on the same side of the total reflection device, the display device is located between the total reflection device and the retro-reflection device, the display device is a conical structure, a side surface of the conical structure is a display surface, the display surface at least includes a first display surface and a second display surface, and the display device is configured to display an image to be holographically displayed.
Further, the display surface further comprises a third display surface, and the third display surface is adjacent to the first display surface or adjacent to the second display surface.
Further, the display surface further comprises a fourth display surface, and the first display surface, the second display surface, the third display surface and the fourth display surface form a side surface of the conical structure.
Further, the display device is in a quadrangular pyramid shape or a quadrangular frustum shape or a conical shape or a frustum cone shape.
According to the technical scheme, the holographic display system and the holographic display method provided by the embodiment of the invention provide a novel holographic display scheme, and the holographic display can be realized without holographic glass by adopting the total reflection and retro-reflection principles, so that the holographic display system and the holographic display method break through the holographic glass or the quadrangular pyramid-shaped glass in the prior art.
The holographic three-dimensional display system provided by the embodiment of the invention combines the total reflection and retro-reflection principles, holographic three-dimensional display can be realized without using holographic glass as an optical propagation medium or quadrangular pyramid-shaped glass, a holographic display virtual image is not limited by a display space, the technical mysterious feeling is improved, and the structure is simple.
The invention has the beneficial effects that:
the holographic display system provided by the embodiment of the invention combines the total reflection and retro-reflection principles, holographic display can be realized without using holographic glass as an optical propagation medium or quadrangular pyramid-shaped glass, a holographic displayed virtual image is not limited by a display space, the technical mysterious feeling is improved, the structure is simple, and the implementation is easy.
The imaging method of the holographic display system provided by the embodiment of the invention combines the total reflection and retro-reflection principles, holographic display can be realized without using holographic glass as an optical propagation medium or quadrangular pyramid-shaped glass, a holographic displayed virtual image is not limited by a display space, and a brand-new holographic display technical scheme is provided.
The holographic three-dimensional display system provided by the embodiment of the invention combines the total reflection and retro-reflection principles, holographic three-dimensional display can be realized without using holographic glass as an optical propagation medium or quadrangular pyramid-shaped glass, a holographic display virtual image is not limited by a display space, the technical mysterious feeling is improved, and the structure is simple.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 shows a schematic diagram of a holographic display system according to a first embodiment of the present invention;
FIG. 2 shows a flow chart of a first embodiment of an imaging method for a holographic display system provided by the present invention;
fig. 3 shows a schematic structural diagram of a first embodiment of a holographic stereoscopic display system provided by the invention.
Detailed Description
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, 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.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As shown in fig. 1, a schematic structural diagram of a first embodiment of a holographic display system provided by the present invention is shown, the holographic display system includes a display device 11, a total reflection device 12 and a retro-reflection device 13, the display device 11 is used for displaying an image to be holographically displayed, and light emitted by the display device 11 is irradiated onto the total reflection device; the total reflection device 12 is used for totally reflecting the light rays irradiated by the display device onto the total reflection device onto the retroreflection device; retro-reflection device 13 adopts concave arc structure, and retro-reflection device 13 is used for changing the angle of light and makes the whole retro-reflection of light of total reflection device reflection pass total reflection device and form holographic virtual image, and display device 11's one end nearly total reflection device 12, display device 11's the other end is close to the one end of retro-reflection device 13, and the other end of retro-reflection device 13 is close to total reflection device 12. The display means 11 and the retro-reflecting means 13 are located on the same side of the total reflecting means 12. The display device 11, the total reflection device 12 and the retro-reflection device 13 are in contact with each other, gaps are avoided as much as possible between the display device 11, the total reflection device 12 and the retro-reflection device 13, external light is prevented from being incident, and an imaging effect is ensured. The retroreflection device with the concave arc-shaped structure can also improve the retroreflection light rays to be converged to the maximum extent without dispersion, so that the brightness and the definition of the holographic virtual image are increased, and the imaging effect of the holographic display system is ensured. Retroreflection refers to reflection of reflected light from a direction opposite to that of the incident light back toward the light source. This characteristic is maintained when the incident light varies over a wide range. The retroreflective device of this embodiment is made of a retroreflective material that totally reflects incident light back in the reverse original path of the incident light. Retroreflective materials have been widely used in road traffic safety or related fields, such as traffic safety facilities such as reflective traffic signs and markings, reflective clothing, reflective license plates, and the like.
Imaging principle of holographic display system: the light emitted by the display device irradiates the first surface of the total reflection device to form a first incident angle, the first incident angle of the display device incident on the first surface of the total reflection device is larger than or equal to a total reflection critical angle of the total reflection device, the total reflection device reflects all the reflected light onto the retro-reflection device to form a second incident angle, the arc-shaped retro-reflection device changes the angle of the light to enable all the light to be retro-reflected to the first surface of the total reflection device, all the retro-reflected light passes through the total reflection device, and a holographic virtual image is formed in a space outside the opposite surface of the first surface of the total reflection. The total reflection device is made of glass material, but not limited to the glass material. In practical applications, the installation angle between the display device, the total reflection device and the retro-reflection device is related to the selected size of the display device, the size of the total reflection device and the size of the retro-reflection device.
The holographic display system provided by the embodiment of the invention combines the total reflection and retro-reflection principles, holographic display can be realized without using holographic glass as an optical propagation medium or quadrangular pyramid-shaped glass, a holographic displayed virtual image is not limited by a display space, a user can interact with the holographic virtual image, the mysterious feeling of the display technology is improved, the structure is simple, and the realization is easy.
The present invention also provides another embodiment of a holographic display system, which is different from the first embodiment in that: a reflective grating film is arranged on one surface of the total reflection device 12 close to the display device 11, and an absorptive grating film is arranged on one surface of the total reflection device 12 far away from the display device 11. The surface of the total reflection device close to the display device is provided with a reflection type grating film for totally reflecting all light rays incident to the total reflection device as far as possible, and one surface of the total reflection device far away from the display device is provided with an absorption type grating film for preventing external interference light from influencing the light ray transmission of the display device.
The present invention also provides another embodiment of a holographic display system, which is different from the first embodiment in that: the retroreflection device 13 is formed by closely arranging a plurality of mediums with retroreflection performance, and a coating layer is arranged on the reflection surface of the medium. The retro-reflective means 13 may be formed by a plurality of closely arranged prismatic media, the reflective surfaces of which are provided with a coating. The retro-reflection means 13 may also be formed by a plurality of spherical media arranged closely, the reflecting surfaces of which are provided with a coating. The reflecting surface of the prismatic medium or the spherical medium is provided with a coating layer, so that the leakage of incident light can be prevented from influencing the imaging effect. The retroreflection device adopts a plurality of prismatic media or spherical media to perform original path reflection on the light reflected by the total reflection device, so that the imaging effect of the holographic virtual image of the holographic display system is ensured.
The holographic display system provided by the embodiment of the invention combines the total reflection and retro-reflection principles, holographic display can be realized without using holographic glass as an optical propagation medium or quadrangular pyramid-shaped glass, a holographic displayed virtual image is not limited by a display space, a user can interact with the holographic virtual image, and the holographic display system is simple in structure and easy to realize.
In a second aspect, as shown in fig. 2, there is shown a flowchart of a first embodiment of an imaging method of a holographic display system, the imaging method is suitable for the holographic display system described in the above embodiment, the system includes a display device, a total reflection device and a retro-reflection device, the imaging method includes:
s21, the light emitted by the display device is incident on the first surface of the total reflection device to form a first incident angle, and the first incident angle is larger than or equal to the critical angle of total reflection of the total reflection device;
s22, the total reflection device totally reflects the reflected light to the retroreflection device to form a second incidence angle;
and S23, the retroreflection device reflects the light rays to the first surface of the total reflection device, the retroreflected light rays pass through the total reflection device, and a holographic virtual image is formed in the space except the opposite surface of the first surface of the total reflection device.
The imaging method of the holographic display system comprises the steps that an image to be holographically displayed is displayed on a display device, light rays displayed by the display device enter a first surface of a total reflection device to form a first incident angle, the first incident angle is larger than or equal to a total reflection critical angle of the total reflection device, the total reflection device reflects all the reflected light rays to a retro-reflection device, the light rays reflected by the total reflection device enter the retro-reflection device to form a second incident angle, the angle of the light rays is changed by the retro-reflection device, so that the light rays reflected by the total reflection device are retro-reflected to the first surface of the total reflection device in an original path, the retro-reflected light rays pass through the total reflection device, and holographic virtual images are.
The imaging method of the holographic display system provided by the embodiment of the invention combines the total reflection and retro-reflection principles, holographic display can be realized without using holographic glass as an optical propagation medium or quadrangular pyramid-shaped glass, a holographic displayed virtual image is not limited by a display space, and a brand-new holographic display technical scheme is provided.
In a third aspect, the present invention further provides a structural schematic diagram of a first embodiment of a holographic stereoscopic display system, where the system includes a total reflection device 31, a display device 32, and a retroreflection device 33, the retroreflection device 33 is an inward concave arc-shaped structure, the display device 32 and the retroreflection device 33 are located on the same side of the total reflection device 1, the display device 32 is located between the total reflection device 31 and the retroreflection device 33, the display device 32 is a conical structure, a side surface of the conical structure is a display surface, the display surface at least includes a first display surface 321 and a second display surface 322, and the display device 32 is configured to display an image to be holographically displayed. The total reflection device 31 and the retroreflection device 33 are connected to form a closed space, so that external light is prevented from being incident, and an imaging effect is ensured. If the total reflection means 31 and the retroreflection means 33 cannot be connected together by themselves, the ID design is required between the respective portions to achieve the effect of connecting the respective portions and isolating the external light. The retro-reflection device adopts the concave arc structure, so that retro-reflection light rays can be improved to be converged to the maximum extent without being dispersed, the brightness and the definition of the holographic virtual image are increased, and the imaging effect of the holographic three-dimensional display system is ensured. Retroreflection refers to reflection of reflected light from a direction opposite to that of the incident light back toward the light source. This characteristic is maintained when the incident light varies over a wide range. The retroreflective device of this embodiment is made of a retroreflective material that totally reflects incident light back in the reverse original path of the incident light. Retroreflective materials have been widely used in road traffic safety or related fields, such as traffic safety facilities such as reflective traffic signs and markings, reflective clothing, reflective license plates, and the like. The display device is of a conical structure, the side face of the conical structure is a display face, the display face at least comprises a first display face and a second display face, and the display device is used for displaying an image to be holographically displayed. The display device can set the number of the display surfaces according to the actual situation, at least 2 display surfaces are needed to display the image to be holographically displayed, the holographic three-dimensional virtual image can be formed in the space outside the outer surface of the total reflection device, and the non-display side surface of the conical structure display device can be replaced by the glass with the coating so as to reduce the production cost. The display device may have 2 display surfaces, 3 display surfaces or 4 display surfaces. When the display device comprises a first display surface and a second display surface, 2 display surfaces form two side surfaces of the conical structure. The display device comprises 3 display surfaces, wherein the display surfaces comprise a first display surface, a second display surface and a third display surface, and the 3 display surfaces respectively form 3 side surfaces of the conical structure. The display device comprises 4 display surfaces, and the display device comprises a first display surface, a second display surface, a third display surface and a fourth display surface, wherein the 4 display surfaces are four side surfaces of a conical structure respectively.
In the specific production, the display device can be made into a quadrangular pyramid shape or a quadrangular frustum shape, and at least 2 side surfaces of the quadrangular pyramid or the quadrangular frustum are display surfaces to display the image to be holographically displayed. The display device can be made into a cone shape or a truncated cone shape, the side surface of the cone or the truncated cone is a display surface, and at least 2 display surfaces display images to be holographically displayed.
Imaging principle of holographic stereo display system: the first incident angle of the first display surface incident to the first surface (the surface close to the display device) of the total reflection device is larger than or equal to the total reflection critical angle of the total reflection device, the total reflection device reflects all the reflected light rays to the retroreflection device to form a second incident angle, the retroreflection device of the concave arc structure changes the angle of the light rays to enable all the light rays to be reversely reflected to the first surface of the total reflection device, all the retroreflection light rays penetrate through the total reflection device, and a holographic virtual plane image is formed in a space outside the opposite surface (the outer surface) of the first surface of the total reflection device. The light emitted by the second display surface irradiates the first surface of the total reflection device to form a third incident angle, the third incident angle of the second display surface incident to the first surface (the surface close to the display device) of the total reflection device is larger than or equal to the total reflection critical angle of the total reflection device, the total reflection device reflects all the reflected light to the retroreflection device to form a fourth incident angle, the retroreflection device of the concave arc structure changes the angle of the light to enable all the light to be reflected to the first surface of the total reflection device in a retroreflection mode, all the retroreflection light penetrates through the total reflection device, a holographic virtual plane image is formed in a space outside the opposite surface (the outer surface) of the first surface of the total reflection device, and the human eyes of an observer see a plurality of holographic virtual plane images and then synthesize the.
The present invention also provides another embodiment of a holographic display system, which is different from the first embodiment in that: the surface of the total reflection device 32 close to the display device 31 is provided with a reflective grating film, and the surface of the total reflection device 32 far from the display device 31 is provided with an absorptive grating film. The surface of the total reflection device close to the display device is provided with a reflection type grating film for totally reflecting all light rays incident to the total reflection device as far as possible, and one surface of the total reflection device far away from the display device is provided with an absorption type grating film for preventing external interference light from influencing the light ray transmission of the display device.
The holographic three-dimensional display system provided by the embodiment of the invention combines the total reflection and retro-reflection principles to realize holographic three-dimensional display, the virtual image of the holographic three-dimensional display is not limited by the display space, a user can interact with the holographic virtual image, the mysterious feeling of the display technology is improved, the structure is simple, and the implementation is easy.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art 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; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (5)
1. A holographic display system is characterized by comprising a display device, a total reflection device and a retro-reflection device, wherein the display device is used for displaying an image to be holographically displayed, and light rays emitted by the display device irradiate on the total reflection device; the total reflection device is used for reflecting all the light rays irradiated by the display device to the retroreflection device; the retroreflection device is of an inwards concave arc structure, the retroreflection device is used for changing the angle of light rays so that the light rays reflected by the total reflection device are totally retroreflected and pass through the total reflection device to form a holographic virtual image, a reflection type grating film is arranged on the surface, close to the display device, of the total reflection device, an absorption type grating film is arranged on the surface, far away from the display device, of the total reflection device, the retroreflection device is formed by tightly arranging a plurality of media with retroreflection performance, and a coating is arranged on the reflection surface of the media.
2. The holographic display of claim 1, in which the retro-reflective means comprises a plurality of prismatic media, reflective surfaces of the prismatic media being provided with a coating.
3. Holographic display of any of claims 1 to 2, in which the total reflection means is made of glass.
4. An imaging method for a holographic display system, suitable for use in the holographic display system of claim 1, the imaging method comprising:
the light emitted by the display device is incident on a first surface of the total reflection device to form a first incident angle, and the first incident angle is larger than or equal to a total reflection critical angle of the total reflection device;
the total reflection device totally reflects the reflected light to the retroreflection device to form a second incidence angle;
the retroreflection device reflects the light to the first surface of the total reflection device, the retroreflected light passes through the total reflection device, and a holographic virtual image is formed in a space outside the opposite surface of the first surface of the total reflection device.
5. A holographic three-dimensional display system is characterized by comprising a total reflection device, a display device and a retro-reflection device, wherein the retro-reflection device is of an inwards concave arc-shaped structure, the display device and the retro-reflection device are positioned on the same side of the total reflection device, the display device is positioned between the total reflection device and the retro-reflection device, a reflective grating film is arranged on the surface, close to the display device, of the total reflection device, an absorption grating film is arranged on the surface, far away from the display device, of the total reflection device, the display device is of a conical structure, the side face of the conical structure is a display face, the display face at least comprises a first display face and a second display face, the display device is used for displaying an image to be holographically displayed, the display face further comprises a third display face, the third display face is adjacent to the first display face or adjacent to the second display face, and the display face, the first display surface, the second display surface, the third display surface and the fourth display surface form a side surface of a conical structure.
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| CN110286495B (en) * | 2019-07-08 | 2023-12-29 | 成都工业学院 | Retroreflective stereoscopic display device based on light source array |
| CN110262051B (en) * | 2019-07-26 | 2023-12-29 | 成都工业学院 | Retroreflective stereoscopic display device based on directional light source |
| CN112684610B (en) * | 2021-03-11 | 2021-06-18 | 成都工业学院 | Slit grating 3D display with high optical efficiency |
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| TWI579591B (en) * | 2015-04-02 | 2017-04-21 | 尚立光電股份有限公司 | Head mounted display device |
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| CN207133563U (en) * | 2017-07-14 | 2018-03-23 | 朱平齐 | A kind of holographic projector for reproducing article 3-dimensional image |
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