CN111562683B

CN111562683B - Three-dimensional holographic projection system generated by light oscillation and working method thereof

Info

Publication number: CN111562683B
Application number: CN202010349947.9A
Authority: CN
Inventors: 李伟; 颜应文; 刘云鹏; 田泽民; 李井华; 刘勇
Original assignee: Nanjing University of Aeronautics and Astronautics
Current assignee: Nanjing University of Aeronautics and Astronautics
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2021-06-22
Anticipated expiration: 2040-04-28
Also published as: CN111562683A

Abstract

The invention discloses a three-dimensional holographic projection technology generated by light oscillation, which belongs to the field of projection and mainly utilizes a control terminal to send two kinds of information: 1) controlling an oscillation generator to enable an oscillation plate to generate oscillation with a certain amplitude and a certain frequency, and forming a blank three-dimensional projection space in the residual shadow of the upper and lower boundaries of the oscillation plate; 2) the light-emitting time and the current of the LED lamps are controlled, when the LED lamps swing along with the oscillating plate, colored light rays can be marked in a projection space, the length of the light rays is determined by the light-emitting time, the color of the light rays is determined by the current, lines generated by a plurality of LED lamps form a complete external surface outline of a three-dimensional graph, and the graph formed is suspended in the air because the lamps do not emit light at the positions close to the residual images of the upper and lower boundaries of the oscillating plate, so that the aim of holographic projection is fulfilled.

Description

Three-dimensional holographic projection system generated by light oscillation and working method thereof

Technical Field

The invention belongs to the field of projection, relates to a holographic projection technology, and particularly relates to a three-dimensional holographic projection system generated by light oscillation and a working method thereof.

Background

Since the birth of television images, people are always pursuing a technology which is more real and more approximate to the human eye image display technology, and the 3D projection technology is produced. The holographic projection technology is known to people because of the real visual impact feeling of being hard to distinguish between true and false. The main application places of holographic projection are museums, science and technology gardens, advertising activities and the like, generally, a method for realizing holographic projection mainly obtains a graph with strong stereoscopic impression by projecting light rays in air, a projection screen is influenced by using the method, an image suspension effect is generally obtained by hiding an edge disappearance hiding technology of the projection screen on a stage, and the object projection effect is achieved by using a visual persistence principle widely at present.

Disclosure of Invention

In view of the progress of the existing research, the invention provides a novel system for realizing holographic projection, an LED lamp connected with an oscillating plate is driven by the up-and-down oscillation of the oscillating plate, a colored line is drawn in the space by controlling the light emitting time and the electrifying current of the LED lamp, the peripheral outline of an object is formed by the light drawn by a plurality of LED lamps and displayed in the projection space, and the purpose of obtaining a three-dimensional suspension image is achieved.

The invention is realized by the following steps:

a three-dimensional holographic projection system generated by light oscillation is characterized by comprising an oscillation generator and an oscillation plate connected with the oscillation generator; the oscillating plate is provided with a plurality of LED lamps; a control terminal is arranged outside the oscillation generator, and sends a control signal to the oscillation generator through the control terminal so as to control the oscillation plate to generate periodic oscillation with fixed frequency and amplitude; the invention drives the LED lamp connected with the oscillating plate to oscillate by the up-and-down oscillation of the oscillating plate, controls the light emitting time and the electrifying current of the LED lamp, draws out a colored light in the space, utilizes the light drawn out by a plurality of LED lamps to form the peripheral outline of an object, and displays the peripheral outline in the projection space, thereby achieving the purpose of obtaining a real suspended three-dimensional image.

In order to make the oscillating plate generate periodic oscillation with fixed frequency and amplitude, a control signal needs to be sent to the oscillation generator through a control terminal, the oscillation frequency mainly influences the oscillation speed of the LED lamp and determines whether the oscillating plate is captured by human eyes or not when oscillating, and the amplitude determines the physical size of the projection space.

The upper and lower boundaries of the maximum amplitude generated by the oscillating plate are boundary contour residual shadows of the oscillating plate, and a projection space is formed between the boundary contour residual shadows of the upper and lower oscillating plates; the peripheral outline of the object is formed by the light rays drawn by the LED lamp, and the light rays are displayed in a projection space in an oscillating mode;

because the physical space of the oscillating plate is limited, the physical peripheral outline size formed by the LED light is small, in order to obtain better visual effect, the amplifying device is added at the periphery of the projection space, the amplifying device is similar to a convex lens, the projection space is positioned at the focus of the convex lens, all the physical light is amplified, and the amplification factor can be controlled at will by controlling the focal length. Therefore, the convex lens is arranged on the periphery of the oscillation generator and the oscillation plate thereof, the projection space is positioned at the focus of the convex lens, all physical light rays are amplified, and the display multiple of a projected image is controlled by controlling the focal length. The physical size of the oscillating plate is not too large, a cylindrical convex lens can be horizontally arranged in order to obtain a larger and macroscopic holographic projection image, the projection space is positioned at the focus of the convex lens, and the display multiple of a projected image can be controlled at will by controlling the focal length of the convex lens.

Furthermore, the convex lens is arranged in the horizontal direction of the oscillation generator and the oscillation plate thereof, and the convex lens arranged in the horizontal direction is an incomplete cylindrical convex lens; a gap is formed in the horizontal direction of the incomplete cylindrical convex lens, and a control terminal and an oscillation generator are placed in the missing part.

Furthermore, the convex lens is arranged in the vertical direction of the oscillation generator and the oscillation plate thereof, and the convex lens arranged in the vertical direction is a complete cylindrical convex lens; the oscillating plate is vertically positioned at the axis of the complete cylindrical convex lens. The boundary speed is zero when the oscillating plate oscillates, the edge contour residual shadow of the oscillating plate is easy to be captured by naked eyes, if a transparent material is adopted as a manufacturing material of the oscillating plate, the transparency and the non-reflection of light of the oscillating plate are ensured, at the moment, the oscillating plate is vertically placed in the axis direction of the complete cylindrical convex lens, and the holographic projection graph can be observed in 360 degrees in the horizontal direction.

Furthermore, the oscillating plate is made of transparent non-reflective materials, the fatigue resistance performance is good, the service life is prolonged, the transparent non-reflective materials are used for obtaining better image impression, the effect that the holographic projection image can be observed by 360 degrees in all directions in the horizontal direction can be obtained, and therefore when the space with dark light oscillates, although the speed of the boundary is zero, the edge contour ghost of the oscillating plate at the boundary can not be seen by eyes.

Further, the arrangement mode of the plurality of LED lamps is as follows: the LED lamps are arranged in an array in a ring-by-ring mode around the center with the LED lamps at the center as the middle points, one side, pointing to the center, of each LED lamp is shielded by the light blocking surface of the LED lamp, light cannot penetrate through the light blocking surface of the LED lamp to reach the inside of a projection graph, and can be emitted from the light emitting surface of the LED lamp away from the center, so that the condition that the front light of a projection object can only be seen from the direction of an observer and the light emitted from the back cannot be seen is guaranteed.

Further, when the oscillating plate moves at the lowest end and the topmost end of the maximum amplitude, the LED lamp does not emit light, but emits light in a projection space, and a suspended light field is formed in the air. The more lamp light rays are used for forming the peripheral outline of the object, the higher the resolution of the displayed image is, so that the resolution of the projected image can be controlled at will by controlling the size and the number of the LED lamps. By changing the number and the size of the LED lamps, 3D stereo graphics with clear picture quality and higher resolution can be obtained. The smaller the size, the better the technology allows, the LED lamp can adopt 0402LED paster, or graphite atom lamp, or nanometer luminescent material, the smaller the size, the more the number of the lamp, the clearer the obtained figure.

Furthermore, the electrifying and light emitting frequency of the LED lamp is twice of the oscillation frequency of the oscillating plate; because the image acquisition frequency of the human eyes is less than the oscillation frequency of the oscillation plate, the LED power-on luminous frequency is twice of the oscillation frequency of the oscillation plate, so that the next luminous information is acquired without the image ghost of the human eyes disappearing in the period of time of ending the last luminous time and starting the next luminous time, and the holographic projection effect of obtaining continuous three-dimensional stereoscopic real object images is achieved.

Because the recognition frequency of human eyes is about 24HZ, the period is about 41ms, and the energizing frequency of the oscillation LED is more than 24HZ, the oscillation frequency of the oscillation plate is more than 12HZ, the purpose of displaying three-dimensional stereo images can be realized, the requirement on the service life of the oscillation plate is low, the energizing frequency of the LED lamp is more than 24HZ, and the oscillation frequency of the oscillation plate is more than 12 HZ.

The invention also discloses a working method of the three-dimensional holographic projection system generated by light oscillation, which is characterized by comprising the following steps:

the control terminal stores control programs of the light emitting time and the magnitude of the electrifying current of all the LED lamps, the light emitting time and the oscillation frequency of the LED lamps determine the length of drawn light, the magnitude of the current determines the color of the light, and the light rays of all the LED lamps form a physical peripheral outline;

the control terminal sends two control signals:

1) one is as follows: the control terminal controls the oscillation generator to enable the oscillation plate to generate oscillation with certain amplitude and frequency, the LED lamp connected with the oscillation plate is driven to oscillate by the up-and-down oscillation of the oscillation plate, and a blank projection space is formed in the edge shadow of the edge of the upper oscillation plate and the lower oscillation plate of the oscillation plate due to the fact that human eyes cannot capture the physical edge of the oscillation plate which oscillates rapidly;

2) the second step is as follows: the control terminal controls the light emitting time and the current of the LED lamps, when the LED lamps swing along with the oscillating plate, colored light rays can be marked in a projection space, the light emitting time determines the light ray length, and the current determines the light ray color, lines generated by the LED lamps form a complete external surface outline of the three-dimensional graph, and the formed graph is a suspended light field because the LED lamps do not emit light at the edge of an afterimage of the edge outline of the oscillating plate, namely a holographic projection graph of all three-dimensional information of an object is obtained.

The beneficial effects of the invention and the prior art are as follows:

1) compared with the current air projection and interaction technology, the three-dimensional image generated by light oscillation is not limited by the environment temperature, does not need to produce water vapor and has no requirement on the use of a field; the invention has simple principle, can display all physical characteristics of the surface of a suspended real three-dimensional object in a projection manner, and is mainly used in large-scale exhibition sites such as science and technology shows, museums and the like.

2) Compared with the rotary LED display technology, the rotary LED lamp technology also utilizes the principle of persistence of vision, but the technology generates a plane figure suspended in the air, and the oscillating light holographic projection technology of the invention arranges a plurality of LED lamps on a two-dimensional plane to generate oscillation, so that a real three-dimensional lamp light field consisting of a plurality of beams of light is obtained, namely the real three-dimensional effect is more stereoscopic.

3) The technology amplifies the original three-dimensional lamp light field with small size in a small range according to any multiple by the convex lens principle, and can obtain a more large and shocking holographic projection effect.

4) If the material technology's the requirement that reaches, can adopt transparent material as the oscillation plate material, can not see the physics edge of oscillation plate when producing the oscillation in darker space, when the axis direction oscillation plate that adopts the all-round convex lens of level and oscillation plate horizontal placement like this, can realize 360 degrees all-round projections of horizontal direction.

Drawings

FIG. 1 is a system diagram of a holographic projection technique of the present invention, generated by lamp light oscillation;

FIG. 2 is a schematic diagram of the vertical placement of the convex lens of a holographic projection technology system generated by lamp light oscillation according to the present invention;

FIG. 3 is a partial schematic view of a holographic projection technique of the present invention, generated by lamp light oscillation;

FIG. 4 is a schematic diagram of the spatial arrangement of LED lamps in a holographic projection technique by lamp oscillation according to the present invention;

the system comprises a 1-3D model ball, a 2-oscillation plate boundary outline ghost, a 3-control terminal, a 4-oscillation generator, a 5-oscillation plate, a 6-LED lamp, a 7-incomplete cylindrical convex lens, a 8-complete cylindrical convex lens, a 9-projection space, a 001-observer observation direction, a 002-light blocking surface of the LED lamp and a 003-light emitting surface of the LED lamp.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention more clear, the present invention is further described in detail by the following examples. It should be noted that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The system comprises an oscillation generator 4 and an oscillation plate 5 connected with the oscillation generator 4; the oscillating plate 5 is provided with a plurality of LED lamps 6; the control terminal 3 is arranged outside the oscillation generator 4, and sends a control signal to the oscillation generator 4 through the control terminal 3 so as to control the oscillation plate 5 to generate periodic oscillation with fixed frequency and amplitude; the upper and lower boundaries of the maximum amplitude generated by the oscillating plate 5 are oscillating plate boundary contour residual shadows 2, and a projection space 9 is formed between the upper and lower oscillating plate boundary contour residual shadows 2; the light rays emitted and scribed by the LED lamp 6 form the peripheral outline of the object, and are displayed in the projection space 9 in an oscillating mode; convex lenses are arranged on the peripheries of the oscillation generator 4 and the oscillation plate 5, and the convex lenses can be arranged on the horizontal direction or the vertical direction of the oscillation generator 4 and the oscillation plate 5.

As shown in fig. 1, it is a schematic diagram of a horizontal arrangement position of a convex lens in a three-dimensional holographic projection technology system generated by light oscillation according to the present invention, that is, a normal arrangement position in practical application.

The control terminal 3 stores all the LED lamp lighting currents and the power-on time and a program for instructing the oscillation generator to control the vibrating plate to generate the oscillation frequency. When the system works, the control terminal 3 firstly sends a signal to enable the oscillation generator 4 to work, so that the oscillation plate 5 generates mechanical oscillation with known amplitude and controllable frequency, the LED lamp 6 connected with the oscillation plate 5 also swings up and down along with the mechanical oscillation, after the oscillation is stable, the oscillation frequency is greater than the image acquisition frequency of human eyes, the edge contour residual shadow 2 of the oscillation plate 5 can be seen only at the upper and lower maximum edges of the oscillation plate 5, and an imaginary blank projection space 9 is formed between the upper and lower maximum edges, and the space is not really blank and can not be identified by human eyes only if the oscillation is too fast. At this time, the control terminal 3 controls all the LED lamps 6 to emit light in an orderly and discrete manner through a program, the program comprises the light emitting time and the magnitude of the electrifying current of the LED lamps, the light emitting time and the oscillation frequency can control the length of the line segment drawn by the LED lamps 6 in the projection space 9, the electrifying current can control the light emitting color of the LED lamps 6, and a suspended lamp light field is formed because the light does not emit light at the upper and lower maximum boundaries close to the oscillation plate 5. Not all the LED lamps 6 emit light at the same time, and whether the light is emitted depends on the three-dimensional outline of the displayed object, and the shape formed by the lamp light of all the LED lamps is the outline of the displayed three-dimensional object.

Because the light field of the lamp is produced through oscillation, so the physical size of the oscillating plate 5 cannot be too large, otherwise a large amount of energy can be consumed, in order to obtain a larger and more vivid three-dimensional shape, an incomplete cylindrical convex lens 7 is horizontally arranged outside the projection space 9 to amplify an image formed by the light field of the LED lamp, and an observer can observe a three-dimensional holographic projection object image with a larger size when looking from the outside to the inside. When the oscillation plate 5 is positioned at the upper and lower maximum boundaries, the speed is zero, and the oscillation plate is easily captured by naked eyes, so that the incomplete cylindrical convex lens 7 can only be placed in the horizontal direction and cannot be placed in the vertical direction, and the missing part is mainly used for placing the control terminal 3 and the oscillation generator 4.

In order to obtain the effect that the holographic projection image can be observed in all directions at 360 degrees in the horizontal direction, the oscillating plate 5 can be made of a transparent and non-reflective material, so that when the space with dark light oscillates, although the speed at the boundary is zero, the edge contour ghost 2 of the oscillating plate at the boundary can not be seen by eyes, and at the moment, the arrangement positions of all parts of the system are shown in fig. 2. The oscillating plate 5 is vertically arranged at the axis of the complete cylindrical convex lens 8, the projection space 9 is just positioned at the focus of the convex lens, the shielding of the oscillating plate is avoided, and an observer can see suspended three-dimensional images when rotating 360 degrees around the complete cylindrical convex lens 8.

The three-dimensional image displayed by the invention is composed of light fields, the light-emitting colors and the light-emitting duration of all the LED lamps form a colored light ray in the projection space 9, and the line segments can be spliced into the peripheral outline of the displayed object by combining. To achieve this, all the LED lamps cannot emit light all at the same time, and the LEDs that have emitted light cannot interfere with each other, and the light rays emitted by the LED lamps 6 constitute an object, such as the peripheral outline of the 3D model sphere 1 shown in fig. 3, displayed in the projection space 9: when the LED lamp is seen from the observation direction 001 of an observer, the LED lamp closest to the observer can only emit light towards one side of the observer, light cannot penetrate through the inside of the model ball in the opposite direction to reach the other side, otherwise, the light seen by the observer at the other side is not completely 'light on the outline'. In order to achieve the above purpose, the spatial arrangement positions of the LED lamps are shown in fig. 4, the centers of the similar cylindrical coordinates in the arrangement mode are arranged in an array of a circle around, and one side of each LED lamp pointing to the center is shielded by a light blocking surface 002 of the LED lamp, so that light cannot pass through the light blocking surface to reach the inside of a projection object, and only light can be emitted from a light emitting surface 003 of the LED lamp away from the center, thereby ensuring that only light on the front side of the 3D model ball 1 can be seen from an observer direction 001, and light on the back side is emitted and transmitted to the back side.

The invention discloses a holographic projection technology generated by lamp tube oscillation, which is characterized in that a control terminal is mainly used for controlling an oscillation generator, so that an oscillation plate generates oscillation with fixed frequency and amplitude, and an LED lamp connected with the oscillation plate is driven to vibrate up and down. The power-on time and the current magnitude of the LED lamp are controlled through a control terminal program, so that the light emitting time and the light emitting color of the LED lamp can be controlled, a colored light with long and short length is formed in a projection space, although the occurrence time is short, the colored light can alternately and repeatedly appear, the light which is originally discrete and discontinuous and is identified by human eyes as the light which continuously exists is superposed again when the visual ghost and the next light appear in the last occurrence time, and the light of a plurality of LED lamps is mutually combined to form the peripheral outline of an object to be displayed. When the oscillating plate is positioned at the maximum position of the upper and lower amplitudes through program control, the LED lamp does not emit light, and a suspended stereoscopic light field, namely a holographic projection graph with three-dimensional information, is formed between the boundaries of the upper and lower amplitudes. The specific working process is as follows:

firstly, storing control programs of the light emitting time and the magnitude of the electrifying current of all the LED lamps 6 in the control terminal 3, wherein the light emitting time and the oscillation frequency of the LED lamps 6 determine the length of drawn light, the current magnitude determines the color of the light, and the light rays of all the LED lamps 6 form a physical peripheral outline;

the control terminal 3 mainly sends two kinds of information, wherein one of the two kinds of information is that the oscillation generator 4 is controlled to enable the oscillation plate 5 to generate oscillation with a certain amplitude and a certain frequency, and a blank stereoscopic projection space 9 is formed in the edge silhouette residual shadow 2 of the oscillation plate at the upper and lower edges of the oscillation plate 5 due to the fact that human eyes cannot capture the physical edge of the oscillation plate which rapidly oscillates; another kind of signals of the control terminal 3 are used for controlling the light emitting time and the current of the LED lamp 6, when the LED lamp 6 swings along with the oscillating plate, a colored light is marked in the projection space 9, the light emitting time determines the light length, and the current determines the light color, lines generated by a plurality of LED lamps form a complete three-dimensional figure outer surface outline, and the formed figure is suspended in the air because the lamps do not emit light at the position of the edge outline ghost 2 of the oscillating plate close to the upper and lower edges of the oscillating plate, so that the purpose of holographic projection is achieved.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.

Claims

1. A three-dimensional holographic projection system generated by light oscillation, characterized in that said system comprises an oscillation generator (4), an oscillation plate (5) connected to the oscillation generator (4); a plurality of LED lamps (6) are arranged on the oscillating plate (5); a control terminal (3) is arranged outside the oscillation generator (4), and a control signal is sent to the oscillation generator (4) through the control terminal (3) so as to control the oscillation plate (5) to generate periodic oscillation with fixed frequency and amplitude;

the upper and lower boundaries of the maximum amplitude generated by the oscillating plate (5) are oscillating plate boundary contour residual shadows (2), and a projection space (9) is formed between the upper and lower oscillating plate boundary contour residual shadows (2); the peripheral outline of the object is formed by the light emitted and drawn by the LED lamp (6) and is displayed in the projection space (9);

the periphery of the oscillation generator (4) and the oscillation plate (5) is provided with a convex lens, the projection space (9) is positioned at the focus of the convex lens, all physical light rays are amplified, and the display multiple of a projected image is controlled by controlling the focal length.

2. 3-a three-dimensional holographic projection system generated by lamp light oscillation according to claim 1, characterized in that the convex lens is arranged in the horizontal direction of the oscillation generator (4) and its oscillating plate (5), and the convex lens arranged in the horizontal direction is a convex lens (7) of incomplete cylindrical shape; a gap is formed in the horizontal direction of the incomplete cylindrical convex lens (7), and the control terminal (3) and the oscillation generator (4) are placed in the missing part.

3. 3-a three-dimensional holographic projection system generated by lamp light oscillation according to claim 1, characterized in that the convex lens is arranged in the vertical direction of the oscillation generator (4) and its oscillating plate (5), the convex lens arranged in the vertical direction being a full cylindrical convex lens (8); the oscillating plate (5) is vertically positioned at the axis of the complete cylindrical convex lens (8).

4. 3-a three-dimensional holographic projection system generated by lamp oscillation according to claim 1, characterized in that the oscillating plate (5) is made of transparent and non-reflective material.

5. The three-dimensional holographic projection system generated by lamp light oscillation as claimed in claim 1, wherein the plurality of LED lamps (6) are arranged in a manner that: the LED lamp (6) at the center position is used as a middle point, the LED lamps (6) are arranged in an array in a ring-to-ring mode all around, one side, which is pointed to by each LED lamp (6), of each LED lamp is shielded by a light blocking surface (002) of the LED lamp, light cannot penetrate through the light blocking surface (002) of the LED lamp to reach the inside of a projection graph, and can only be emitted from a light emitting surface (003) of the LED lamp deviated from the center, so that the front light of a projection object can only be seen from the direction (001) of an observer, and light emitted from the back cannot be seen.

6. The system according to claim 1, wherein the LED lamp (6) does not emit light when the oscillating plate (5) moves at the lowest and the highest ends of the maximum amplitude, but emits light in the projection space (9) to form a floating lamp field in the air; the LED lamp (6) adopts 0402LED paster or nano luminescent material.

7. A method of operating a three-dimensional holographic projection system generated by lamp light oscillations according to claim 1, characterized in that said method is embodied as:

the control terminal (3) stores control programs of the light emitting time and the electrifying current of all the LED lamps (6), the light emitting time and the oscillation frequency of the LED lamps (6) determine the length of drawn light, the current determines the color of the light, and the light rays of all the LED lamps (6) form a physical peripheral outline;

the control terminal (3) sends two control signals:

1) one is as follows: the control terminal (3) controls the oscillation generator (4) to enable the oscillation plate (5) to generate oscillation with certain amplitude and frequency, the LED lamp (6) connected with the oscillation plate (5) is driven to oscillate by the up-and-down oscillation of the oscillation plate (5), and a blank projection space (9) is formed in the edge residual shadow (2) of the upper and lower oscillation plates of the oscillation plate (5) due to the fact that human eyes cannot capture the physical edge of the oscillation plate which oscillates rapidly;

2) the second step is as follows: the control terminal (3) controls the light emitting time and the current of the LED lamp (6), when the LED lamp (6) swings along with the oscillating plate (5), a colored light ray can be marked in the projection space (9), the light emitting time determines the light ray length, and the current determines the light ray color, lines generated by a plurality of LED lamps (6) form a complete three-dimensional graph outer surface outline, and the LED lamp (6) does not emit light at the boundary of the oscillating plate boundary outline ghost (2), so that the formed graph is a suspended light field, namely a holographic projection graph for obtaining all three-dimensional information of an object.