Museum holographic projection display device and display method

Abstract

The invention provides a museum holographic projection display device and a display method, and belongs to the technical field of display, the museum holographic projection display device comprises a second base fixedly connected to the surface of a first base, a glass cover fixedly connected to the surface of the second base, and projection equipment arranged in the second base, the surface of the first base is provided with a placing groove, and a rotating assembly is arranged in the placing groove, through the above design, when the device is used, interference of external light can be improved through water mist when the light is strong, the contrast ratio is improved, and when the light is common, the definition is improved through the circular micro-lens array. Therefore, the problems that when a traditional holographic projection display device for the museum works in a light environment, due to interference of external light, the contrast ratio is difficult to improve, the projected image is fuzzy, the detail performance is poor, and the display effect is affected are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of display, and particularly relates to a museum holographic projection display device and a display method. Background Art

[0002] As an innovative form of modern museum display means, holographic projection technology has greatly enriched the visiting experience of audiences. It reproduces three-dimensional images by using the principles of light interference and diffraction, giving new life to static exhibits and providing immersive visual feasts for audiences. However, the application of this advanced technology is not without challenges. In a strong light environment, it is difficult to improve the contrast of holographic projection because external light interferes with the projection light path, weakening the clarity and color saturation of the image. Especially in the daytime or in an exhibition space with sufficient lighting, this effect is particularly obvious, resulting in the holographic image looking blurred, losing details, and failing to achieve the expected display effect. Therefore, when designing and arranging museum holographic projection displays, the influence of environmental light must be fully considered to ensure that audiences can enjoy a high-quality visual experience.

[0003] In the prior art, when traditional museum holographic projection display devices work in a lighted environment, due to the interference of external light, it is difficult to improve the contrast, resulting in blurred projection images and poor detail performance, affecting the display effect. Summary of the Invention

[0004] The purpose of the present invention is to provide a museum holographic projection display device and a display method, aiming to solve the problem that when traditional museum holographic projection display devices in the prior art work in a lighted environment, due to the interference of external light, it is difficult to improve the contrast, resulting in blurred projection images and poor detail performance, affecting the display effect.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A museum holographic projection display device, comprising a first base, a second base, a glass cover and a projection device. The second base is fixedly connected to the surface of the first base, the glass cover is fixedly connected to the surface of the second base, the projection device is arranged in the second base, a placement groove is formed on the surface of the first base, and a rotation assembly and a water mist assembly are arranged in the placement groove; The rotation assembly is used to switch circular microlens arrays with different parameters, and includes a third motor, a second rotating rod, a transmission assembly and a circular microlens array. The third motor is fixed in the storage groove of the first base, and its output end is coaxially connected to the second rotating rod to drive the second rotating rod to rotate axially; The transmission assembly includes a first gear, a second gear, and an annular gear. The first gear is axially slidably connected to the second rotating rod through a first limiting block, and the protrusion of the first limiting block matches the first limiting grooves on both sides of the second rotating rod. A plurality of the second gears are respectively rotatably connected to the surface of the threaded block and are all meshed with the first gear. The annular gear is meshed with all the second gears and drives a plurality of circular microlens arrays to rotate and switch synchronously through a radially fixed connecting rod, realizing the rapid switching of different microlens arrays. The water mist assembly is arranged at the upper end of the glass cover and is used to spray water mist into the glass cover. The water mist assembly and the circular microlens arrays work in combination in the glass cover according to the ambient light intensity to adapt to different lighting conditions.

[0006] As a preferred solution of the present invention, an adjusting assembly for finely adjusting the height of the circular microlens array is further arranged in the placement groove. The adjusting assembly includes a first motor, a rotating cylinder, a third rotating rod, a third bevel gear, and a fourth bevel gear. The first motor is fixedly connected to the surface of the second base. One end of the third rotating rod is fixedly connected to the output end of the first motor. The third bevel gear is fixedly connected to the other end of the third rotating rod. The rotating cylinder is rotatably connected to the inner wall of the placement groove and is in threaded cooperation with the threaded block. The fourth bevel gear is fixedly connected to the circumferential surface of the rotating cylinder and is meshed with the third bevel gear.

[0007] As a preferred solution of the present invention, a cleaning assembly for cleaning the surface of the circular microlens array is arranged at the upper end of the second rotating rod. The cleaning assembly includes a cleaning rod and a cleaning brush. The cleaning rod is fixedly connected to one end of the second rotating rod. The cleaning brush is fixedly connected to the surface of the cleaning rod and is in contact with the circular microlens array.

[0008] As a preferred solution of the present invention, the water mist assembly includes a water mist generator, a uniform component, and a support frame. There are two support frames. The circular spray port at the lower end of the water mist generator is rotatably connected to the inner wall of the central circular opening of the first bevel gear. Both support frames are fixedly connected to the surface of the top plate, and the closer ends of the two support frames are respectively fixedly connected to both sides of the water mist generator.

[0009] As a preferred embodiment of the present invention, the uniform component includes a top plate, a second motor, a first rotating rod, a first bevel gear, a second bevel gear, and a tapered fine mesh. The top plate is fixedly connected to the upper end of the glass cover. The first bevel gear is rotatably connected to the surface of the top plate, and a circular opening is provided in the middle of the first bevel gear. The tapered fine mesh is fixedly connected to the lower end of the first bevel gear. The second motor is fixedly connected to the surface of the top plate. One end of the first rotating rod is fixedly connected to the output end of the second motor. The second bevel gear is fixedly connected to the other end of the first rotating rod, and the first rotating rod meshes with the first bevel gear.

[0010] As a preferred embodiment of the present invention, a radiation port is fixedly connected to the surface of the projection device, and the image of the projection device is irradiated out through the radiation port. The circular microlens array is located directly above the radiation port. The lens densities, apertures, or focal lengths of the multiple circular microlens arrays are different, and they are all located directly above the radiation port, and its area is greater than or equal to the area of the largest image of the projector to ensure complete coverage of the image projected by the projector.

[0011] As a preferred embodiment of the present invention, the rotating component further includes a limit guiding structure. The limit guiding structure includes a limit rod vertically fixed in the placement groove, and a rotating groove is provided inside it for the second rotating rod to pass through. Two parallel second limit grooves are provided on the surface of the limit rod. The threaded block is sleeved on the outer wall of the limit rod, and anti-rotation constraints are formed by two second limit blocks fixed on the inner wall through the sliding groove.

[0012] As a preferred embodiment of the present invention, the tapered fine mesh is a tapered fine mesh.

[0013] As a preferred embodiment of the present invention, the third motor is a servo motor with the ability of forward and reverse rotation.

[0014] On the other hand, this solution also provides a method for holographic projection display in a museum, including the following steps: S1. The light of the projection device is emitted from the radiation port, and then passes through the circular microlens array for projection. The circular microlens array is a circular lens integrating multiple micro-lenses. Each lens can focus and scatter light. When the image light emitted by the projection device passes through the circular microlens array, the light will be focused and scattered under the action of each microlens, forming multiple small light beams. These light beams interfere and superimpose with each other in space, thereby generating a holographic projection. By the rotating component, the second rotating rod can be controlled to rotate, thereby driving the circular microlens array to rotate around the second rotating rod as the center, so as to control different circular microlens arrays to rotate directly above the radiation port. In this way, the contrast and clarity under different lighting environments can be improved; S2. By means of the adjusting component, the lifting of the threaded block can be controlled, thereby changing the height of the circular microlens array, so as to adjust the distance between the circular microlens array and the radiation port, thereby controlling the imaging size and improving the image clarity. S3. When the rotating component rotates and adjusts the circular microlens array, the second rotating rod will drive the cleaning rod and the cleaning brush to rotate around the second rotating rod as the center, so as to clean the dust on the surface of the circular microlens array and prevent the dust on the surface of the circular microlens array from affecting the projection effect. S4. When the light is strong, water mist is generated through the water mist component and scattered into the conical fine mesh. Then, the conical fine mesh is controlled to rotate by the uniform component. The conical fine mesh uniformly diffuses the water mist, forming a stable projection medium layer to enhance the clarity and three-dimensional sense of the image.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When the device is used in an environment with general or not very strong light, the projection is emitted from the radiation port and passes through the circular microlens array with different lens densities, apertures or focal lengths for projection. These circular microlens arrays focus and scatter light by integrating multiple micro-lenses, forming multiple small light beams that interfere and superimpose with each other in space, thereby generating a holographic projection to enhance the visual effect. According to the illumination conditions, the category of the circular microlens array is adjusted. In strong light, the microlens array - C is adopted, using a smaller number of large-aperture micro-lenses to reduce the scattering and interference of light, and improve the contrast and clarity. By rotating the circular microlens array driven by the second rotating rod of the rotating component, the circular microlens array with different lens densities, apertures or focal lengths can be accurately positioned directly above the radiation port, thereby optimizing the projection effect in different illumination environments and improving the contrast and clarity.

[0016] 2. In a strong light environment, the water mist effect is better than that of the circular microlens array and can provide a better visual display. The water mist is generated through the water mist component and enters the conical fine mesh, and the conical fine mesh is controlled to rotate by the uniform component. Since the conical fine mesh is a conical fine mesh, it can uniformly diffuse the water mist to the inner wall of the glass cover, forming a stable projection medium layer to enhance the clarity and three-dimensional sense of the image. The rotating conical fine mesh makes the water mist distribution more delicate, further improving the projection effect. Therefore, in strong light, this setting can significantly improve the quality of the visual display. In ordinary light, using the circular microlens array can provide better clarity and color reproduction.

[0017] 3. By adjusting the component to control the lifting of the threaded block, the height of the circular microlens array can be changed, thereby adjusting the distance between it and the radiation port. This adjustment method can flexibly control the imaging size, improve the image clarity, and enhance the color performance, providing more possibilities for creative display. This method enables the device to optimize the visual effect according to the needs of different exhibition contents and ensure that each display reaches the best state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 is the first perspective three-dimensional view of the present invention; Figure 2 is the exploded view of the present invention; Figure 3 is the schematic diagram of the water mist component and the uniform component of the present invention; Figure 4 is the first partial schematic diagram of the present invention; Figure 5 is the enlarged view of part A of the present invention; Figure 6 is the enlarged view of part B of the present invention; Figure 7 is the second partial schematic diagram of the present invention; Figure 8 is the third partial schematic diagram of the present invention; Figure 9 is the second perspective three-dimensional view of the present invention; Figure 10 is the schematic diagram of the cleaning component of the present invention.

[0019] In the figures: 1. First base; 2. Second base; 3. Glass cover; 4. Top plate; 5. First motor; 6. Water mist generator; 7. Support frame; 8. Second motor; 9. First rotating rod; 10. First bevel gear; 11. Second bevel gear; 12. Conical fine mesh; 13. Circular microlens array; 14. Cleaning rod; 15. Cleaning brush; 16. Second rotating rod; 17. First limiting groove; 18. First limiting block; 19. First gear; 20. Second gear; 21. Ring gear; 22. Connecting rod; 23. Threaded block; 24. Second limiting block; 25. Sliding groove; 26. Rotating cylinder; 27. Rotating groove; 28. Limiting rod; 29. Second limiting groove; 30. Placing groove; 31. Third rotating rod; 32. Third bevel gear; 33. Fourth bevel gear; 34. Projection device; 35. Radiation port; 36. Storage groove; 37. Third motor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment 1: Please refer to Figures 1 - 10 , the present invention provides the following technical solutions: A holographic projection display device for a museum, comprising a first base 1, a second base 2, a glass cover 3 and a projection device 34. The second base 2 is fixedly connected to the surface of the first base 1, the glass cover 3 is fixedly connected to the surface of the second base 2, the projection device 34 is arranged in the second base 2, and a placement groove 30 is formed on the surface of the first base 1. A rotation assembly and a water mist assembly are arranged in the placement groove 30; The rotation assembly is used to switch circular microlens arrays 13 with different parameters, and includes a third motor 37, a second rotating rod 16, a transmission assembly and a circular microlens array 13. The third motor 37 is fixed in a storage groove 36 of the first base 1, and its output end is coaxially connected to the second rotating rod 16 to drive the second rotating rod 16 to rotate around the axis; The transmission assembly includes a first gear 19, a second gear 20 and an annular gear 21. The first gear 19 is axially slidably connected to the second rotating rod 16 through a first limit block 18, and the protrusion of the first limit block 18 matches the first limit grooves 17 on both sides of the second rotating rod 16. A plurality of the second gears 20 are respectively rotatably connected to the surface of a threaded block 23 and are all meshed with the first gear 19. The annular gear 21 is meshed with all the second gears 20 and drives a plurality of circular microlens arrays 13 to rotate and switch synchronously through a radially fixed connecting rod 22, so as to realize the rapid switching of different circular microlens arrays 13; The water mist assembly is arranged at the upper end of the glass cover 3 and is used to spray water mist into the glass cover 3. The water mist assembly and the circular microlens array 13 work in combination in the glass cover 3 according to the ambient light intensity to adapt to different lighting conditions.

[0022] In a specific embodiment of the present invention, when the device is used in an environment with normal or not very strong light, the projection light is emitted from the radiation port 35 and then passes through the circular microlens array 13 for projection. The multiple circular microlens arrays 13 are respectively circular lenses integrating multiple micro-lenses. Each lens can focus and scatter light. According to the lens density and aperture distribution of the circular microlens array 13, the light intensity distribution is optimized. For the array with a high lens density, the light intensity is evenly distributed in the areas corresponding to each microlens; for the array with a low lens density and a large aperture, the overall light intensity output is appropriately reduced to avoid overexposure caused by too strong light, and at the same time, the main light direction is highlighted to improve the contrast. The three circular microlens arrays 13 are respectively the microlens array - A, the microlens array - B, and the microlens array - C. The microlens array - A is designed to have a relatively high lens density (a large number of microlenses per unit area), and the aperture of each microlens is relatively small. In this way, in a relatively dark environment, through the focusing and scattering effects of numerous microlenses on the light, the brightness and uniformity can be enhanced. The microlens array - B adopts a design of microlenses with a medium lens density and a medium aperture size. It is suitable for general lighting environments and achieves a balance between brightness and contrast. The microlens array - C is set with a relatively low lens density (a small number of microlenses per unit area), and the aperture of each microlens is relatively large. In a strong light environment, a small number of large-aperture microlenses are used to reduce the scattering and interference of light, improving the contrast and clarity. The third motor 37 is a servo motor with the ability of forward and reverse rotation. By operating the third motor 37, the second rotating rod 16 is controlled to rotate. Then, the first gear 19 is sleeved on the circumferential surface of the second rotating rod 16, and it is limited to the second rotating rod 16 by two first limit blocks 18. Therefore, the first gear 19 will rotate together with the second rotating rod 16, thereby driving multiple second gears 20 to rotate. Then, the multiple second gears 20 drive the annular gear 21 to rotate, and the annular gear 21 drives the multiple circular microlens arrays 13 to rotate. In this way, the contrast and clarity in different lighting environments are improved.

[0023] For details, please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7, an adjusting component for finely adjusting the height of the circular microlens array 13 is further provided in the placement groove 30. The adjusting component includes a first motor 5, a rotating cylinder 26, a third rotating rod 31, a third bevel gear 32 and a fourth bevel gear 33. The first motor 5 is fixedly connected to the surface of the second base 2. One end of the third rotating rod 31 is fixedly connected to the output end of the first motor 5. The third bevel gear 32 is fixedly connected to the other end of the third rotating rod 31. The rotating cylinder 26 is rotatably connected to the inner wall of the placement groove 30 and is in threaded cooperation with the threaded block 23. The fourth bevel gear 33 is fixedly connected to the circumferential surface of the rotating cylinder 26, and the fourth bevel gear 33 meshes with the third bevel gear 32.

[0024] In this embodiment: By operating the first motor 5, the third bevel gear 32 is controlled to rotate, and then the fourth bevel gear 33 meshing with the third bevel gear 32 will also rotate. Therefore, the rotating cylinder 26 fixedly connected to the fourth bevel gear 33 will also rotate. Also, since the threaded block 23 is threadedly connected to the inner wall of the rotating cylinder 26 and the threaded block 23 is limited by the second limiting block 24 and will not rotate, when the rotating cylinder 26 rotates, the threaded block 23 will move up and down. At this time, the first limiting block 18 will also slide in the first limiting groove 17, thereby driving the circular microlens array 13 to change its height, so as to adjust the distance between the circular microlens array 13 and the radiation port 35. Because by adjusting the distance between them, the imaging size can be flexibly controlled, the image clarity can be improved, the color performance can be enhanced, and the possibility of creative display can be increased, so as to better adapt to different exhibition contents.

[0025] Specifically, please refer to Figure 7 and Figure 10 , a cleaning component for cleaning the surface of the circular microlens array 13 is provided at the upper end of the second rotating rod 16. The cleaning component includes a cleaning rod 14 and a cleaning brush 15. The cleaning rod 14 is fixedly connected to one end of the second rotating rod 16. The cleaning brush 15 is fixedly connected to the surface of the cleaning rod 14, and the cleaning brush 15 is in contact with the circular microlens array 13.

[0026] In this embodiment: When the rotating component rotates and adjusts the circular microlens array 13, the second rotating rod 16 will rotate, and the second rotating rod 16 will drive the cleaning rod 14 and the cleaning brush 15 to rotate around the second rotating rod 16 as the center. Also, since the diameters of the first gear 19 and the annular gear 21 are different, the rotation speeds of the cleaning rod 14 and the annular gear 21 are different. The rotation speed difference is used to clean the dust on the surface of the circular microlens array 13 to prevent the dust on the surface of the circular microlens array 13 from affecting the projection effect.

[0027] Specifically, please refer to Figure 1 , Figure 2 and Figure 3, The uniform component includes a top plate 4, a second motor 8, a first rotating rod 9, a first bevel gear 10, a second bevel gear 11, and a conical fine mesh 12. The top plate 4 is fixedly connected to the upper end of the glass cover 3. The first bevel gear 10 is rotatably connected to the surface of the top plate 4, and there is a circular opening in the middle of the first bevel gear 10. The conical fine mesh 12 is fixedly connected to the lower end of the first bevel gear 10. The second motor 8 is fixedly connected to the surface of the top plate 4. One end of the first rotating rod 9 is fixedly connected to the output end of the second motor 8. The second bevel gear 11 is fixedly connected to the other end of the first rotating rod 9, and the first rotating rod 9 meshes with the first bevel gear 10.

[0028] In this embodiment: By operating the second motor 8, the second bevel gear 11 is controlled to rotate, and the meshing first bevel gear 10 will be driven to rotate, thereby driving the conical fine mesh 12 to rotate. When the water mist scatters into the conical fine mesh 12, because the conical fine mesh 12 is a conical fine mesh, it can evenly disperse the water mist to the inner wall of the glass cover 3, forming a stable projection medium layer, enhancing the image clarity and three-dimensional sense. Rotating the conical fine mesh 12 can make the water mist distribution more delicate.

[0029] Specifically, please refer to Figure 1 , Figure 2 and Figure 3 , The water mist component includes a water mist generator 6, a uniform component, and a support frame 7. There are two support frames 7. The circular spray port at the lower end of the water mist generator 6 is rotatably connected to the inner wall of the circular opening in the center of the first bevel gear 10. Both support frames 7 are fixedly connected to the surface of the top plate 4, and the closer ends of the two support frames 7 are respectively fixedly connected to both sides of the water mist generator 6.

[0030] In this embodiment: When the light is strong, the water mist effect is better than that of the circular microlens array 13 and can provide a better visual display; while in normal light, the circular microlens array 13 shows better clarity and color. Therefore, in a strong light environment, through the water mist component, the water mist generator 6 can be used to generate water mist and scatter it into the conical fine mesh 12.

[0031] Specifically, please refer to Figure 2 and Figure 8 , A radiation port 35 is fixedly connected to the surface of the projection device 34. The image of the projector is irradiated out through the radiation port 35, and the circular microlens array 13 is located directly above the radiation port 35.

[0032] In this embodiment: The circular microlens array 13 is located directly above the radiation port 35 and directly above the projector without deviation, which can ensure that the light passes through evenly and avoid image distortion or shadow caused by position deviation.

[0033] Specifically, please refer to Figure 2 andFigure 8 , the circular microlens array 13 should be large enough to ensure that it can completely cover the image projected by the projector.

[0034] In this embodiment: the circular microlens array 13 should be large enough to ensure that it can completely cover the image projected by the projector. This is to prevent the edge part of the projected image from not being fully refracted or covered due to the insufficient size of the circular microlens array 13 when the circular microlens array 13 is far from the radiation port 35, resulting in incomplete image display or vignetting and other phenomena.

[0035] Specifically, please refer to Figure 3 , the conical fine mesh 12 is a conical fine mesh.

[0036] In this embodiment: the conical fine mesh 12 can more effectively disperse the water mist, making the water mist more evenly attached to the inner wall of the cylindrical glass cover, avoiding the situation of local over-concentration or over-dilution, and ensuring the consistency of the projection medium.

[0037] Specifically, please refer to Figure 9 , the third motor 37 is a servo motor with the ability of forward and reverse rotation.

[0038] In this embodiment: the third motor 37 is a servo motor with the ability of forward and reverse rotation, which is used to control the up and down movement of the circular microlens array 13.

[0039] Usage process of this device: When this device is used in an environment with normal or not very strong light, the projection light is emitted from the radiation port 35, and then passes through the circular microlens array 13 for projection. The circular microlens array 13 is a circular lens respectively integrated with multiple tiny lenses. Each lens can focus and scatter light. When the image light emitted by the projection device 34 passes through the circular microlens array 13, the light will be focused and scattered under the action of each microlens, forming multiple small light beams. These light beams interfere and superimpose with each other in space, thus generating a holographic projection. By operating the third motor 37, the second rotating rod 16 is controlled to rotate. Then, the first gear 19 is sleeved on the circumferential surface of the second rotating rod 16, and is limited to the second rotating rod 16 by two first limit blocks 18. Therefore, the first gear 19 will rotate together with the second rotating rod 16, thereby driving multiple second gears 20 to rotate. Then, the multiple second gears 20 drive the annular gear 21 to rotate, and the annular gear 21 drives multiple circular microlens arrays 13 to rotate. In this way, the contrast and clarity under different lighting environments are improved; when the rotating assembly rotates and adjusts the circular microlens array 13, the second rotating rod 16 will rotate, and the second rotating rod 16 will drive the cleaning rod 14 and the cleaning brush 15 to rotate around the second rotating rod 16 as the center. Also, because the diameters of the first gear 19 and the annular gear 21 are different, the rotation speeds of the cleaning rod 14 and the annular gear 21 are different. The rotation speed difference is used to clean the dust on the surface of the circular microlens array 13 to prevent the dust on the surface of the circular microlens array 13 from affecting the projection effect; then, by operating the first motor 5, the third bevel gear 32 is controlled to rotate, and the fourth bevel gear 33 meshing with the third bevel gear 32 will also rotate accordingly. Therefore, the rotating cylinder 26 fixedly connected to the fourth bevel gear 33 will also rotate. Also, because the threaded block 23 is threadedly connected to the inner wall of the rotating cylinder 26 and the threaded block 23 is limited by the second limit block 24 and will not rotate, when the rotating cylinder 26 rotates, the threaded block 23 will move up and down. At this time, the first limit block 18 will also slide in the first limit groove 17, thereby driving the circular microlens array 13 to change its height, so as to adjust the distance between the circular microlens array 13 and the radiation port 35. Because by adjusting the distance between them, the imaging size can be flexibly controlled, the image clarity can be improved, the color performance can be enhanced, and the possibility of creative display can be increased, so as to better adapt to different exhibition contents; when the light is strong, the water mist effect is better than the circular microlens array 13 and can provide a better visual display;Under normal light, the circular microlens array 13 exhibits better clarity and color. Therefore, in a strong light environment, through the water mist component, water mist is created and scattered into the conical fine mesh 12. Then, the uniform component controls the rotation of the conical fine mesh 12. Since the conical fine mesh 12 is a conical fine mesh, it can evenly disperse the water mist to the inner wall of the glass cover 3, forming a stable projection medium layer, enhancing the image clarity and three-dimensional sense. Rotating the fine mesh can make the water mist distribution more delicate. Through the above design, when using this device, when the light is strong, water mist can be used to improve the interference of external light and enhance the contrast. When the light is normal, the circular microlens array 13 is used to improve the clarity, thus solving the problem that in a traditional museum holographic projection display device, when working in a lighted environment, due to the interference of external light, it is difficult to enhance the contrast, resulting in a blurred projection image, poor detail performance, and affecting the display effect.

[0040] Embodiment 2: On the other hand, the present invention also provides a museum holographic projection display method, including the following steps: S1. The light of the projection device 34 is emitted from the radiation port 35 and then passes through the circular microlens array 13 for projection. The circular microlens array 13 is a circular lens integrated with multiple micro-lenses, and each lens can focus and scatter light. When the image light emitted by the projection device 34 passes through the circular microlens array 13, the light will be focused and scattered under the action of each microlens, forming multiple small light beams. These light beams interfere and superimpose with each other in space, thereby generating a holographic projection. By the rotation component, the second rotating rod 16 can be controlled to rotate, thereby driving the circular microlens array 13 to rotate around the second rotating rod 16 as the center, so as to control different circular microlens arrays 13 to rotate directly above the radiation port 35, and in this way, the contrast and clarity in different lighting environments are improved; S2. Through the adjustment component, the lifting of the threaded block 23 can be controlled, thereby changing the height of the circular microlens array 13, so as to adjust the distance between the circular microlens array 13 and the radiation port 35, thereby controlling the imaging size and enhancing the image clarity; S3. When the rotation component rotates and adjusts the circular microlens array 13, the second rotating rod 16 will drive the cleaning rod 14 and the cleaning brush 15 to rotate around the second rotating rod 16 as the center, cleaning the dust on the surface of the circular microlens array 13 to prevent the dust on the surface of the circular microlens array 13 from affecting the projection effect; S4. When the light is strong, through the water mist component, water mist is created and scattered into the conical fine mesh 12. Then, the uniform component controls the rotation of the conical fine mesh 12. Through the conical structure of the conical fine mesh 12, the water mist is evenly dispersed to form a stable projection medium layer, enhancing the image clarity and three-dimensional sense.

[0041] It should be noted that the projection device 34 can adjust the output image content according to the type (A, B, or C) of the circular microlens array 13 currently in use. For example, for the microlens array - A, due to its high lens density and small aperture, the projection device 34 needs to divide the image content into finer sub - image regions, with each sub - image corresponding to a small - aperture microlens. At the same time, the light intensity is appropriately increased to make up for the reduction in light transmission caused by the small aperture, ensuring that a bright and uniform holographic image can be formed in a dark environment. An ambient light monitoring sensor is provided inside the glass cover 3.

[0042] Furthermore, the ambient light monitoring sensor monitors the light intensity of the surrounding environment. According to the monitoring results, the combined working modes of the circular microlens array 13 and the water mist component are switched as follows: Strong light environment (mainly water mist mode): When the ambient light intensity exceeds a preset threshold, the control system preferentially activates the water mist component. The water mist generator 6 generates water mist, and the water mist uniformly diffuses through the conical fine mesh 12 to form a stable water mist layer. At this time, the microlens array - C can also work simultaneously. Its specially designed optical parameters and coatings can cooperate with the water mist environment to further enhance the three - dimensional sense and visual impact of the holographic image. The large - aperture microlenses of the microlens array - C can make the light project more concentratedly onto the water mist layer, and utilize the scattering effect of water mist particles on light to form a bright and clear holographic image.

[0043] General light environment (mainly microlens array mode): Under general lighting conditions, the system mainly relies on the microlens array - B for holographic projection. At this time, the water mist component can be in a standby state or operate at a low power to maintain a certain humidity environment and avoid wasting resources due to excessive use of water mist.

[0044] Weak light environment (mainly microlens array mode): In a relatively dark environment, the system switches to the working mode of the microlens array - A, and uses its high lens density and small - aperture design to enhance the brightness and uniformity of the projection light, presenting a clear and delicate holographic image to the audience. At this time, the water mist component is generally not activated to avoid affecting the projection effect and causing unnecessary energy consumption.

[0045] Finally, it should be noted that the above - mentioned are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A holographic projection display device for a museum, characterized in that, It includes a first base (1), a second base (2), a glass cover (3) and a projection device (34). The second base (2) is fixedly connected to the surface of the first base (1). The glass cover (3) is fixedly connected to the surface of the second base (2). The projection device (34) is arranged inside the second base (2). A placement groove (30) is formed on the surface of the first base (1), and a rotation assembly and a water mist assembly are provided in the placement groove (30). The rotation assembly is used to switch circular microlens arrays (13) with different parameters, and includes a third motor (37), a second rotating rod (16), a transmission assembly and a circular microlens array (13). The third motor (37) is fixed in the storage groove (36) of the first base (1), and its output end is coaxially connected to the second rotating rod (16) to drive the second rotating rod (16) to rotate around the axis. The transmission assembly includes a first gear (19), a second gear (20) and an annular gear (21). The first gear (19) is axially slidably connected to the second rotating rod (16) through a first limiting block (18), and the protrusion of the first limiting block (18) matches the first limiting grooves (17) on both sides of the second rotating rod (16). A plurality of the second gears (20) are respectively rotatably connected to the surface of the threaded block (23) and are all meshed with the first gear (19). The annular gear (21) is meshed with all the second gears (20), and drives a plurality of circular microlens arrays (13) to rotate and switch synchronously through a radially fixed connecting rod (22), so as to realize the rapid switching of different circular microlens arrays (13). The water mist assembly is arranged at the upper end of the glass cover (3) and is used to spray water mist into the glass cover (3). The water mist assembly and the circular microlens array (13) work in combination in the glass cover (3) according to the ambient light intensity to adapt to different lighting conditions.

2. The holographic projection display device for a museum according to claim 1, wherein: An adjusting assembly for finely adjusting the height of the circular microlens array (13) is further arranged in the placement groove (30). The adjusting assembly includes a first motor (5), a rotating cylinder (26), a third rotating rod (31), a third bevel gear (32) and a fourth bevel gear (33). The first motor (5) is fixedly connected to the surface of the second base (2). One end of the third rotating rod (31) is fixedly connected to the output end of the first motor (5). The third bevel gear (32) is fixedly connected to the other end of the third rotating rod (31). The rotating cylinder (26) is rotatably connected to the inner wall of the placement groove (30) and is in threaded cooperation with the threaded block (23). The fourth bevel gear (33) is fixedly connected to the circumferential surface of the rotating cylinder (26), and the fourth bevel gear (33) is meshed with the third bevel gear (32).

3. The holographic projection display device for a museum according to claim 2, wherein: A cleaning component for cleaning the surface of the circular microlens array (13) is provided at the upper end of the second rotating rod (16). The cleaning component includes a cleaning rod (14) and a cleaning brush (15). The cleaning rod (14) is fixedly connected to one end of the second rotating rod (16), and the cleaning brush (15) is fixedly connected to the surface of the cleaning rod (14), and the cleaning brush (15) is in contact with the circular microlens array (13).

4. A museum holographic projection display device according to claim 3, characterized in that: The water mist component includes a water mist generator (6), a uniform component, and a support frame (7). There are two support frames (7). The circular spray port at the lower end of the water mist generator (6) is rotatably connected to the inner wall of the central circular opening of the first bevel gear (10). Both support frames (7) are fixedly connected to the surface of the top plate (4), and the closer ends of the two support frames (7) are respectively fixedly connected to both sides of the water mist generator (6).

5. A museum holographic projection display device according to claim 4, characterized in that: The uniform component includes a top plate (4), a second motor (8), a first rotating rod (9), a first bevel gear (10), a second bevel gear (11), and a conical fine mesh (12). The top plate (4) is fixedly connected to the upper end of the glass cover (3). The first bevel gear (10) is rotatably connected to the surface of the top plate (4), and there is a circular opening in the middle of the first bevel gear (10). The conical fine mesh (12) is fixedly connected to the lower end of the first bevel gear (10). The second motor (8) is fixedly connected to the surface of the top plate (4). One end of the first rotating rod (9) is fixedly connected to the output end of the second motor (8). The second bevel gear (11) is fixedly connected to the other end of the first rotating rod (9), and the first rotating rod (9) meshes with the first bevel gear (10).

6. The holographic projection display device for a museum according to claim 5, wherein: A radiation port (35) is fixedly connected to the surface of the projection device (34). The image of the projection device (34) is irradiated out through the radiation port (35), and the circular microlens array (13) is located directly above the radiation port (35). The lens densities, apertures, or focal lengths of the multiple circular microlens arrays (13) are different, and they are all located directly above the radiation port (35), and their areas are greater than or equal to the area of the largest image of the projector to ensure complete coverage of the image projected by the projector.

7. A museum holographic projection display device according to claim 6, characterized in that: The rotating component further includes a limit guiding structure. The limit guiding structure includes a limit rod (28) vertically fixed in the placement groove (30). A rotating groove (27) is opened inside it for the second rotating rod (16) to pass through. Two parallel second limit grooves (29) are provided on the surface of the limit rod (28). The threaded block (23) is sleeved on the outer wall of the limit rod (28), and anti-rotation constraints are formed by two second limit blocks (24) fixed on the inner wall through the sliding groove (25).

8. A holographic projection display method for a museum, using a holographic projection display device for a museum as described in claim 7, characterized in that: Including the following steps; S1. The light of the projection device (34) is emitted from the radiation port (35), and then passes through the circular microlens array (13) for projection. The circular microlens array (13) is a circular lens respectively integrated with multiple micro-lenses. Each lens focuses and scatters light. When the image light emitted by the projection device (34) passes through the circular microlens array (13), the light will be focused and scattered under the action of each microlens, forming multiple small light beams. These light beams interfere and superimpose with each other in space, thus generating a holographic projection. By rotating the rotating assembly to control the rotation of the second rotating rod (16), the circular microlens array (13) is driven to rotate around the second rotating rod (16) as the center, so as to control different circular microlens arrays (13) to rotate directly above the radiation port (35). In this way, the contrast and clarity under different lighting environments are improved; S2. By adjusting the assembly, the lifting of the threaded block (23) is controlled, so as to change the height of the circular microlens array (13), thereby adjusting the distance between the circular microlens array (13) and the radiation port (35), and thus controlling the imaging size and improving the image clarity; S3. When the rotating assembly rotates and adjusts the circular microlens array (13), the second rotating rod (16) will drive the cleaning rod (14) and the cleaning brush (15) to rotate around the second rotating rod (16) as the center, so as to clean the dust on the surface of the circular microlens array (13), preventing the dust on the surface of the circular microlens array (13) from affecting the projection effect; S4. When the light is strong, through the water mist assembly, water mist is generated and scattered into the conical fine mesh (12). Then, the conical fine mesh (12) is controlled to rotate by the uniform assembly. The conical fine mesh (12) uniformly diffuses the water mist as a conical fine mesh, forming a stable projection medium layer, and enhancing the image clarity and three-dimensional sense.

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