Volume three-dimensional display system and display method thereof

Abstract

The invention discloses a volumetric three-dimensional display system and a display method thereof, holographic diffraction imaging or projection imaging is carried out through a spatial light modulator, laser with different layers of excitation wavelengths is switched in combination with a time sequence, and a volumetric three-dimensional display device with multiple layers of stimulated luminescence structures is excited layer by layer; each group of red light, green light, blue light and yellow light is combined to serve as a body pixel, then a layered color image of a three-dimensional object is described, the SLM and the excitation wavelength laser are refreshed and switched at a high speed, a body three-dimensional object image is constructed and displayed in the body three-dimensional display device through layer-by-layer scanning and refreshing, and color body three-dimensional display is achieved by combining the visual persistence characteristic of human eyes. The calculation amount and the data amount are reduced, the resolution higher than that of a light field scanning body three dimension can be achieved, a movement mechanism is not needed, cost is low, and the size is small.

Description

Technical Field

[0001] The present invention belongs to the field of three-dimensional display technology, and in particular, relates to a volumetric three-dimensional display system and a display method thereof. Background Art

[0002] Volumetric 3D display is one of the current methods for implementing 3D display technology. It achieves 3D effect by displaying real volume pixels in space, allowing multiple viewers to obtain information about different sides of the same 3D object from different angles. There are mainly two technologies: light field scanning volumetric 3D and projection stitching light field volumetric 3D. The two technologies respectively utilize the time division method and matrix method of projection display, that is, they utilize the visual persistence effect of the human eye to integrate a stereoscopic 3D image within the reaction time of the human eye.

[0003] Light field scanning volumetric 3D uses a high-speed projector and a directional scattering screen to project a 3D light field at each viewing angle, integrating the 3D object image in the human eye. Projection splicing light field volumetric 3D uses multiple projectors to work together to achieve spatial pixel angle reconstruction, combined with directional diffusion elements or holographic function screens to achieve light field volumetric 3D display. These two methods can achieve large viewing angle and desktop volumetric 3D display, but there are still several problems: (1) Light field scanning volume 3D uses a rotating directional diffusion screen to perform light field projection display for each viewing angle, so it is necessary to perform light field projection calculations for the input 3D model with the same number of viewing angles. The amount of calculation and data is large, and the calculation and transmission rate is high. When the number of pixels and resolution of the 3D model to be displayed is high, the corresponding amount of calculation and data will double, so it is difficult to achieve high-resolution, high-frame-rate dynamic volume 3D display.

[0004] (2) Light field scanning volume 3D projection of the 3D light field for each viewing angle requires a high-speed projector, which has high hardware costs. In addition, due to the limited data transmission rate, the resolution of current high-speed projectors is generally not high, resulting in low image resolution of the light field scanning volume 3D.

[0005] (3) The three-dimensional light field scanning requires a rotating directional diffusion screen, which has a moving mechanism, resulting in image jitter and noise.

[0006] (4) Projection and splicing of light field volume 3D requires multiple projectors, complex directional diffusion screens and holographic functional screens. For example, the University of Southern California uses 216 projectors to achieve life-size 3D light field display. The hardware cost is very high, the volume is large, and it is difficult to commercialize and promote. Summary of the invention

[0007] In view of the above problems existing in the prior art, the present invention proposes a three-dimensional display system and a display method thereof, which utilizes a volumetric three-dimensional display device of multi-layer phosphors to realize self-luminous, high-resolution, and high-volume pixel-number color volumetric three-dimensional display. No motion mechanism is required, so there is no noise problem of scanning light field volumetric three-dimensional display. Compared with scanning light field volumetric three-dimensional and projection splicing light field volumetric three-dimensional display, the system has lower cost and smaller size.

[0008] The present invention is implemented by the following technical solutions: A volumetric three-dimensional display system is proposed, comprising: A phosphor three-dimensional display device is composed of N layers of phosphor stimulated light-emitting layers; each layer of phosphor stimulated light-emitting layer is composed of coated glass and phosphor pixel display units arranged on the coated glass; wherein the coated glass is provided with a transmission film and a reflection film, and the transmission range of the transmission film covers the wavelengths λ1 to λ of the excitation laser from the first layer to the Nth layer. N , the reflection wavelength range of the i-th layer of coated glass reflective film covers the wavelengths of the excitation lasers from the 1st layer to the i-1th layer λ1 to λ i-1 ; The data processing and control module is used to read the 3D model data, perform layering and layer image data processing on the 3D model data according to the working mode, and transmit the corresponding layer data to the SLM projection imaging module; The phosphor excitation laser light source module is used to be controlled by the data processing and control module to light up the laser of the wavelength required by the phosphor excitation light-emitting layer in a time sequence; The SLM projection imaging module is used to realize imaging of each layer based on the laser input from the phosphor excitation laser light source module.

[0009] Compared with the prior art, the advantages and positive effects of the present invention are as follows: in the volumetric three-dimensional display system proposed by the present invention, the phosphor volumetric three-dimensional display device is composed of N layers of phosphor stimulated luminescence layers, each layer of the phosphor stimulated luminescence layer is composed of a coated glass configured with a transmission film and a reflection film, and a phosphor volumetric pixel display unit arranged on the coated glass, the reflection wavelength of each layer of the reflection film covers the wavelength of the excitation laser of its previous layer, combined with the structure of the device, holographic diffraction imaging or projection imaging is performed through SLM, combined with the time-sequential switching of lasers of different layers of excitation wavelengths, visible light wavelengths are excited on different layers of the phosphor volumetric three-dimensional display device, each group of visible light combinations as a volumetric pixel to depict a layered color image of a three-dimensional object, the SLM and the excitation wavelength laser are refreshed and switched at a high speed, and a volumetric three-dimensional object image is constructed and displayed in the volumetric three-dimensional display device by scanning and refreshing layer by layer, and combined with the visual persistence characteristics of the human eye, a color volumetric three-dimensional display is realized. The technical solution proposed in the present invention is a volumetric three-dimensional display technology that uses a spatial light modulator (SLM) to layer-excite a volumetric three-dimensional display device with a multi-layer phosphor stimulated luminescent layer structure, and implements pixel-level light control on each layer of the volumetric three-dimensional display device with the stimulated luminescent structure through diffraction holographic imaging or projection imaging, and displays a corresponding volumetric three-dimensional layered image on each layer. Through high-speed layer-by-layer scanning and refreshing, a colorful volumetric three-dimensional image is integrated in the human eye. It is a color volumetric three-dimensional display that can achieve self-luminescence, high resolution, and a high number of volume pixels. It does not require a motion mechanism, so there is no noise problem of scanning light field volume 3D, and it is lower in cost and smaller in size than scanning light field volume 3D and projection splicing light field volume 3D.

[0010] In some embodiments of the present invention, the phosphor distribution structure of the phosphor pixel display unit is determined by the pixel arrangement type of the SLM; and the number of the phosphor pixel display units is determined according to the number of physical pixels of the SLM.

[0011] In some embodiments of the present invention, the excitation wavelength of the phosphor stimulated luminescent layer is selected as follows: a wavelength is selected from the intersection of the excitation wavelength ranges of the phosphors of different colors in the layer as the excitation laser wavelength; and there is no intersection between the excitation wavelength ranges of different layers.

[0012] In some embodiments of the present invention, in the fluorescent powder pixel display unit, the dosage of fluorescent powders of different colors is inversely proportional to the brightness of the fluorescent powders when excited with the same wavelength.

[0013] In some embodiments of the present invention, in adjacent layers of the phosphor-stimulated luminescent layer, the phosphor in the front layer is less than that in the rear layer, so that the excitation light per unit laser intensity of the front layer is weaker than that of the rear layer.

[0014] In some embodiments of the present invention, the data processing and control module performs layering and layer image data processing on the three-dimensional model data, including: For the holographic imaging mode, the pixel color separation grayscale image of each layer is calculated, the focus depth information of each layer is calculated and matched with the holographic reconstruction distance of each layer, and the hologram of each layer is calculated and generated according to the pixel color separation grayscale image of each layer, the holographic reconstruction distance, the parameters of the SLM used, and the excitation laser wavelength of the corresponding layer; For the projection imaging mode, the pixel color separation grayscale map of each layer of the image is calculated, the focus depth information of each layer is calculated, and the lens focus motor parameters are adjusted according to the focus depth information of each layer.

[0015] In some embodiments of the present invention, the SLM projection imaging module uses the phosphor to excite the laser input by the laser light source module. In the holographic imaging mode, it receives the incoming computational hologram and loads it into the SLM, and realizes holographic imaging of different layers through the holographic imaging optical path; in the projection imaging mode, it receives the incoming pixel color separation grayscale image and loads it into the SLM, receives the focus depth information and controls the lens focus motor to adjust the imaging lens so that the projected image is focused on the specified layer.

[0016] In some embodiments of the present invention, in the phosphor-stimulated luminescent layer, the luminescent intensity of the phosphor is controlled by the grayscale value of the pixel corresponding to the pixel color separation grayscale image.

[0017] In some embodiments of the present invention, the phosphors of various colors in the phosphor-stimulated light-emitting unit are arranged in RGBY, RGB, RGBYC or RGBC.

[0018] The present invention further provides a volumetric three-dimensional display method, which is applied to the volumetric three-dimensional display system as described above, comprising: Read the 3D model data, and perform layering and layer data processing on the 3D model data according to the working mode; Control the phosphor excitation laser light source of the corresponding wavelength of the phosphor excitation luminescence layer to light up in a time sequence, and control the SLM to load the computational hologram or pixel color separation grayscale image to be displayed by the phosphor excitation luminescence layer according to the working mode; wherein the computational hologram is generated according to the pixel color separation grayscale image; The laser modulated by the computerized hologram or the pixel color separation grayscale image is focused and imaged on the phosphor stimulated light-emitting layer to achieve pixel-level excitation of the phosphor; Each layer of phosphor is stimulated to emit light, and through the integration effect of the human eye, a three-dimensional display image is formed by self-luminous pixels in the phosphor three-dimensional display device.

[0019] Other features and advantages of the present invention will become more apparent after reading the detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 A system structure block diagram of the volumetric three-dimensional display system proposed by the present invention; Figure 2 The data processing flow diagram of the data processing and control module in the present invention is shown; Figure 3 It is a structural block diagram of the phosphor excitation laser light source module in the present invention; Figure 4 It is a structural block diagram of the SLM projection imaging module in the present invention; Figure 5 A cross-sectional view of a fluorescent powder three-dimensional display device in the present invention; Figure 6 The schematic diagram of the relationship between the SLM pixel arrangement and the phosphor distribution of the phosphor stimulated luminescent layer in the present invention; Figure 7 It is a schematic diagram of the depth information of the three-dimensional model layer in the present invention; Figure 8 Schematic diagram of the pixel color separation processing method in the present invention; Fig. 9 This is an illustration of the volumetric three-dimensional display method proposed by the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The volumetric three-dimensional display system proposed by the present invention is as follows: Figure 1 As shown, it is composed of a data processing and control module 1, a phosphor excitation laser light source module 2, an SLM (spatial light modulator) projection imaging module 3 and a phosphor three-dimensional display device 4.

[0024] Combination Figure 2 As shown, the data processing and control module 1 is used to read the input three-dimensional model data, and perform layer-by-layer and layer-image data processing on the three-dimensional model data in sequence according to the working mode.

[0025] For the holographic imaging mode, the color data of each layer of image is separated, and gray balance is performed on the grayscale images separated from each layer to ensure uniform brightness of each layer. The focus depth information of each layer is calculated according to the number of layers and the distance between the SLM and the display medium, and matched to the holographic reconstruction distance of each layer. The excitation wavelength of each layer of phosphor is used as the holographic recording wavelength of each layer, and the computational hologram of the grayscale image of pixel color separation of each layer is calculated. Finally, the hologram of each layer is loaded into the SLM in sequence. For the projection imaging mode, the grayscale image of pixel color separation of each layer is obtained, the focus depth information of the layer is calculated and the focus depth data is matched with each layer. The parameters of the lens focus motor are adjusted according to the focus depth information of each layer to meet the data requirements of the projection imaging mode. The pixel color here is RGBY, RGB, RGBYC or RGBC.

[0026] The image and data of the corresponding working mode are transmitted to the SLM projection imaging module 3, and the phosphor excitation laser light source module 2 is synchronously controlled to light up the excitation wavelength of the phosphor of the current display layer.

[0027] Combination Figure 3 As shown, the phosphor excitation laser light source module 2 is composed of a laser with a corresponding excitation wavelength of multiple layers of phosphors, a laser heat sink, a laser driving circuit board, and a laser beam expansion collimator. The phosphor excitation laser light source module 2 is controlled by the data processing and control module 1, and lights up the laser required for the excitation of each layer of phosphors in a time sequence, thereby assisting the SLM projection imaging module 3 to focus the image on each layer of the phosphor three-dimensional display device module 4, and excite the phosphors of the current display layer to construct pixels.

[0028] Combination Figure 4 As shown, the SLM projection imaging module 3 is composed of an SLM and its driving circuit board, an SLM heat sink, an SLM illumination optical path, a projection imaging lens and its focus motor, and a holographic imaging optical path. The SLM projection imaging module 3 is controlled by the data processing and control module 1, and uses the phosphor to excite the laser input by the laser light source 2. In the holographic imaging mode, the SLM projection imaging module 3 receives the incoming computational hologram and loads it to the SLM, and realizes holographic imaging of different layers through the holographic imaging optical path; in the projection imaging mode, the SLM receives the incoming RGBY, RGB, RGBYC or RGBC pixel color-separated grayscale image and loads it to the SLM, receives the focus depth information and controls the high-speed lens focus motor to adjust the imaging lens, so that the projected image is focused on the specified depth (layer), thereby realizing projection imaging of different layers.

[0029] Combination Figure 5As shown, the phosphor three-dimensional display device 4 is composed of a shell 51 and a plurality of phosphor stimulated luminescent layers, each of which is composed of a coated glass 521, RGBY / RGB / RGBYC / RGBC phosphors 522 and a phosphor sol 523. When the phosphor excitation laser light source module 2 lights up the laser of the excitation wavelength of the i-th phosphor layer, and the SLM projection imaging module 3 projects or holographically focuses the pixel color separation grayscale image of the i-th layer of the three-dimensional model layered diagram, the image focused on the i-th layer of phosphor in the phosphor three-dimensional display device is the pixel color separation grayscale image of the i-th layer of the three-dimensional model. Because the pixels of the pixel color separation grayscale image correspond one-to-one to the phosphors, the laser of the excitation wavelength of the i-th phosphor layer modulated by the pixel color separation grayscale image can excite the i-th phosphor layer to emit light, and the luminous intensity of the phosphor is controlled by the grayscale value of the corresponding pixel of the pixel color separation grayscale image. Because the i-th layer of phosphor is composed of RGBY / RGB / RGBYC / RGBC phosphors and the phosphors are closely related to the pixel color separation grayscale image. Figure 1 One corresponds to another, so the phosphor can be stimulated to emit a combination of light in the visible light band. Each group of light combinations depicts a body pixel of the i-th layer. The display of many body pixels together can depict the color layer image of the three-dimensional model. The phosphor layers are stimulated to emit light in turn and refreshed in a cycle, presenting a three-dimensional display effect in the human eye through the integration effect of the human eye.

[0030] As mentioned above, the shell includes but is not limited to glass, light-transmitting resin, light-transmitting plastic, etc. Glass in coated glass is a general term for coated light-transmitting optical glass materials, phosphors include but are not limited to stimulated luminescent phosphors and other stimulated luminescent materials, and phosphor sol is a general term for glue materials used in the processing and fixing process of stimulated luminescent phosphors and other stimulated luminescent materials.

[0031] In the present invention, in the phosphor pixel display unit, the phosphors of various colors may be arranged in RGBY, or in various arrangements such as RGB, RGBYC, or RGBC.

[0032] The coated glass consists of an anti-reflection film and a total reflection film, of which the first layer of coated glass has only an anti-reflection film. The range of the anti-reflection film covers the wavelengths of the excitation laser from the first layer to the Nth layer λ1 to λ N , corresponding to the wavelength of each layer of excitation laser in the phosphor excitation laser light source module 2. The reflection wavelength range of each layer of coated glass is different: the reflection wavelength range of the i-th layer of coated glass reflection film covers the wavelengths λ1 to λ of the excitation laser of the 1st to i-1th layers. i-1 The coated glass utilizes an anti-reflection film and a total reflection film to allow only the laser of the corresponding excitation wavelength of each layer to pass through and excite the phosphor of that layer, thereby realizing independent excitation luminescence and body pixel display of each layer in the phosphor body three-dimensional display device 4. At the same time, the coated glass serves as an interlayer spacer to avoid the aliasing of body pixels of adjacent layers.

[0033] The excitation wavelength of the phosphor is a range, and the excitation wavelength ranges of a single layer of phosphor overlap. In the present invention application, a wavelength in the intersection is selected as the excitation laser wavelength of the layer; and the phosphor materials and properties of different layers are different, and there is no intersection in the excitation wavelength ranges, thereby avoiding excitation errors and simultaneous excitation of multiple layers.

[0034] A single layer of phosphor may have different excitation brightness at the same wavelength. By balancing the dosage ratio of phosphors of different colors, the phosphors of any body pixel imaging unit can be stimulated to emit red, green, blue and yellow light of equal visual brightness when irradiated by laser of unit brightness excitation wavelength, thereby achieving body pixel display of standard colors.

[0035] When light propagates through layers in the fluorescent powder three-dimensional display device 4, the light intensity will be attenuated. To solve this problem, in the present invention, among adjacent layers, the front layer of fluorescent powder is less than the rear layer of fluorescent powder, so that the excitation light of the unit laser intensity of the front layer is weaker than the excitation light of the unit laser intensity of the rear layer. At the same time, the unit fluorescent powder dosage of different layers (the ratio of each color fluorescent powder) is balanced and adjusted to achieve equal brightness display of pixels in different layers.

[0036] Any RGBY phosphor powder that has been mixed is arranged according to the volume pixel imaging unit, and is sparsely, thinly and regularly dissolved and fixed in the phosphor sol, further reducing the influence of the front side layer of the phosphor three-dimensional display device on the back side layer.

[0037] The distribution of phosphors in the phosphor-stimulated luminescent layer of the phosphor-based three-dimensional display device is determined by the pixel arrangement type of the SLM used. Taking the pixel color as RGBY as an example, the phosphor layer regards the four-color phosphors as a body pixel display unit 61, and the SLM regards the four pixels as a body pixel imaging unit 62. The body pixel display unit 61 corresponds one-to-one to the body pixel imaging unit 62, and the four-color phosphors of RGBY in the body pixel display unit 61 correspond one-to-one to the four pixels in the body pixel imaging unit 62. The number of body pixel display units 61 is determined by the number of physical pixels of the SLM, which is 1 / 4 of the number of physical pixels. If the SLM has a square pixel arrangement, the distribution of the phosphor layer is as follows: Figure 6 shown.

[0038] Combined with the above structure, taking the pixel color as RGBY as an example, the work of the system is explained, such as Fig. 9 As shown, including: S91: When the system starts, it first completes the self-test and then selects the working mode according to the hardware peripherals: holographic imaging mode or projection imaging mode.

[0039] S92: Determine the volumetric three-dimensional layer number N according to the number of layer lasers of the phosphor excitation laser light source module 2 and the number of phosphor excited light-emitting layers of the phosphor three-dimensional display device 4 .

[0040] S93: The data processing and control module 1 reads the input 3D model data and divides it into N layers according to the 3D model depth information.

[0041] Among them, Figure 7 As shown, the depth focusing information of the i-th phosphor stimulated light emitting layer 72 is the sum of the distance D between the SLM 71 and the phosphor three-dimensional display device 4 and the inter-layer spacing d*i of the phosphor three-dimensional display device.

[0042] S94: the data processing and control module 1 performs pixel color separation on the obtained N-layered images.

[0043] First, extract the number of horizontal and vertical pixels of the original layered image and create an empty image template P with double the number of horizontal and vertical pixels of the original image. Establish the pixel correspondence between the original image and the empty image template P, that is, any original image pixel corresponds to the 4 pixels of the original image position in the empty image template P, as shown in Figure 8 As shown, Next, traverse all the pixels of the original image and extract the grayscale values ​​of red, green, blue, and yellow for each pixel in turn. R , g G , g B 、b Y , put the four-color grayscale values ​​into the four adjacent pixels at the corresponding position in the empty image template P, and then construct a SLM body pixel imaging unit. If a fluorescent powder body pixel display unit with other arrangement designs such as RGB, RGBYC, RGBC, etc. is used, the pixel color separation process corresponding to the color arrangement is used.

[0044] Finally, after looping through all pixels of the image, a number of volume pixel imaging units equal to the number of pixels is obtained, thereby obtaining a pixel color separation grayscale image of a certain layer of the 3D model, such as Figure 8 shown.

[0045] S95: The data processing and control module 1 controls the phosphor excitation laser light source module 2 to light up the first layer of phosphor excitation laser. In the projection imaging mode, the projection imaging module 3 controls the SLM to load the first layer of pixel color separation grayscale image. In the holographic imaging mode, the projection imaging module 3 controls the SLM to load the computational hologram of the pixel color separation grayscale image.

[0046] If it is a projection imaging mode, the system lights up the first layer of phosphor excitation laser of the phosphor excitation laser light source module 2, the laser wavelength is λ1, and loads the pixel color separation grayscale image of the first layer of the three-dimensional model onto the SLM. At the same time, the focus motor of the projection imaging lens is adjusted according to the depth focusing data of the first layer, so that the pixel color separation grayscale image of the first layer is focused and imaged on the first layer of the phosphor three-dimensional display device.

[0047] If it is a holographic imaging mode, the system lights up the first layer of phosphor excitation laser of the phosphor excitation laser light source module, the laser wavelength is λ1, and uses the algorithm of computational holography to obtain the computational hologram of the pixel color separation grayscale image of the first layer. In the algorithm, λ1 is used as the holographic recording / reconstruction laser wavelength, the depth focus data of the first layer is used as the distance of holographic recording / reconstruction, and the pixel color separation grayscale image of the first layer is used as the target image of holographic recording / reconstruction. The first layer of the obtained computational hologram is loaded into the SLM, and λ1 is used as the illumination (holographic reconstruction) light. The properties of holographic reconstruction and concentrated imaging are used to focus the pixel color separation grayscale image of the first layer on the first layer of the phosphor three-dimensional display device.

[0048] S96: The laser of the excitation wavelength of the first layer of phosphor modulated by the pixel color separation grayscale image is focused and imaged on the first layer of phosphor of the phosphor body three-dimensional display device to achieve point-to-point pixel-level excitation of the phosphor. The intensity of the excited light from the phosphor is controlled by the grayscale of the pixel color separation grayscale image, and the phosphor emits colored light (red, green, blue, and yellow light) in the visible light band. The combination of colored lights together depicts a body pixel, and the phosphor distributed in a layer array depicts all the body pixels of the layer.

[0049] S97: The second, ..., i, ..., N layers of body pixels are sequentially refreshed and displayed at a high speed. Through the integration (retention) effect of the human eye, a three-dimensional display image composed of free-luminous body pixels can be observed in the fluorescent powder three-dimensional display device 4.

[0050] The wavelength of projection imaging or holographic imaging is λ i When the i-th layer of phosphor powder is focused and imaged in the phosphor powder three-dimensional display device 4, the soma pixel imaging unit of the SLM and its loaded pixel color separation grayscale image corresponds to the soma pixel display unit of the i-th layer of phosphor powder, and the RGBY pixel element of the grayscale image in the unit corresponds to the RGBY phosphor powder. i The laser is used to excite the RGBY phosphors in the i-th layer, so the RGBY phosphors in the i-th layer are excited by the pixel color separation grayscale image with pixel-level accuracy, and any body pixel display unit constructs a color body pixel, thereby realizing the color body pixel display of the i-th layer. The system refreshes and displays the 1st to Nth layers in turn at a high speed, thereby integrating the volumetric three-dimensional display effect in the human eye.

[0051] It should be noted that, in the specific implementation process, part of the above-mentioned method can be implemented by a hardware processor executing computer execution instructions in software form stored in a memory, which will not be elaborated here, and the programs corresponding to the actions executed can be stored in the computer-readable storage device of the system in software form, so that the processor can call and execute the operations corresponding to the above modules.

[0052] The computer-readable storage device mentioned above may include a volatile memory, such as a random access memory; it may also include a non-volatile memory, such as a read-only memory, a flash memory, a hard disk or a solid-state drive; it may also include a combination of the above types of memory.

[0053] The processor mentioned above may also be a general term for multiple processing elements. For example, the processor may be a central processing unit, or other general-purpose processors, digital signal processors, application-specific integrated circuits, field programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc., or may be a dedicated processor.

[0054] It should be pointed out that the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A volumetric three-dimensional display system, characterized in that: include: A phosphor three-dimensional display device is composed of N layers of phosphor stimulated light-emitting layers; each layer of phosphor stimulated light-emitting layer is composed of coated glass and phosphor pixel display units arranged on the coated glass; wherein the coated glass is provided with a transmission film and a reflection film, and the transmission range of the transmission film covers the wavelengths λ1 to λ of the excitation laser from the first layer to the Nth layer. N , the reflection wavelength range of the i-th layer of coated glass reflective film covers the wavelengths of the excitation lasers from the 1st layer to the i-1th layer λ1 to λ i-1 ; The data processing and control module is used to read the 3D model data, perform layering and layer image data processing on the 3D model data according to the working mode, and transmit the corresponding layer data to the SLM projection imaging module; The phosphor excitation laser light source module is used to be controlled by the data processing and control module to light up the laser of the wavelength required by the phosphor excitation light-emitting layer in a time sequence; The SLM projection imaging module is used to realize imaging of each layer based on the laser input from the phosphor excitation laser light source module.

2. The volumetric three-dimensional display system according to claim 1, characterized in that: The phosphor distribution structure of the phosphor pixel display unit is determined by the pixel arrangement type of the SLM; The number of the fluorescent powder pixel display units is determined according to the number of physical pixels of the SLM.

3. The volumetric three-dimensional display system according to claim 1, characterized in that: The excitation wavelength of the phosphor luminescent layer is selected as follows: Selecting a wavelength from the intersection of the excitation wavelength ranges of the phosphors of various colors in the layer as the excitation laser wavelength; And there is no intersection between the excitation wavelength ranges of different layers.

4. The volumetric three-dimensional display system according to claim 1, characterized in that: In the fluorescent powder pixel display unit, the dosage of fluorescent powders of different colors is inversely proportional to the excitation brightness of the fluorescent powders at the same wavelength.

5. The volumetric three-dimensional display system according to claim 1, characterized in that: In adjacent layers of the phosphor-stimulated luminescent layer, the phosphor in the front layer is less than that in the rear layer, so that the excitation light per unit laser intensity of the front layer is weaker than that per unit laser intensity of the rear layer.

6. The volumetric three-dimensional display system according to claim 1, characterized in that: The data processing and control module performs layering and layer image data processing on the three-dimensional model data, including: For the holographic imaging mode, the pixel color separation grayscale image of each layer is calculated, the focus depth information of each layer is calculated and matched with the holographic reconstruction distance of each layer, and the hologram of each layer is calculated and generated according to the pixel color separation grayscale image of each layer, the holographic reconstruction distance, the parameters of the SLM used, and the excitation laser wavelength of the corresponding layer; For the projection imaging mode, the pixel color separation grayscale map of each layer of the image is calculated, the focus depth information of each layer is calculated, and the lens focus motor parameters are adjusted according to the focus depth information of each layer.

7. The volumetric three-dimensional display system according to claim 1, characterized in that: The SLM projection imaging module uses the phosphor to excite the laser input by the laser light source module. In the holographic imaging mode, it receives the incoming computational hologram and loads it into the SLM, and realizes holographic imaging of different layers through the holographic imaging optical path; in the projection imaging mode, it receives the incoming pixel color separation grayscale image and loads it into the SLM, receives the focus depth information and controls the lens focus motor to adjust the imaging lens, so that the projected image is focused on the specified layer.

8. The volumetric three-dimensional display system according to claim 1, characterized in that: In the phosphor-excited luminescent layer, the luminescent intensity of the phosphor is controlled by the grayscale value of the corresponding pixel in the pixel color separation grayscale image.

9. The volumetric three-dimensional display system according to claim 1, characterized in that: The phosphors of various colors in the phosphor-stimulated light-emitting unit are arranged in RGBY, RGB, RGBYC or RGBC.

10. A volumetric three-dimensional display method, applied to the volumetric three-dimensional display system according to claim 1, characterized in that: include: Read the 3D model data, and perform layering and layer image processing on the 3D model data according to the working mode; Control the phosphor excitation laser light source of the corresponding wavelength of the phosphor excitation luminescence layer to light up in a time sequence, and control the SLM to load the computational hologram or pixel color separation grayscale image to be displayed by the phosphor excitation luminescence layer according to the working mode; wherein the computational hologram is generated according to the pixel color separation grayscale image; The laser modulated by the computerized hologram or the pixel color separation grayscale image is focused and imaged on the phosphor stimulated light-emitting layer to achieve pixel-level excitation of the phosphor; Each layer of phosphor is stimulated to emit light, and through the integration effect of the human eye, a three-dimensional display image is formed by self-luminous pixels in the phosphor three-dimensional display device.

Images