A volumetric three-dimensional display system and a display method thereof

Abstract

The application discloses a kind of volume three-dimensional display systems and display method thereof, and the holographic diffraction imaging or projection imaging is carried out by spatial light modulator, different layer excitation wavelength laser is combined with time sequence switching, and the volume three-dimensional display device of multi-layer excited light structure is excited layer by layer;Each group of red green blue yellow light combination is as a volume pixel, and then the layered color image of three-dimensional object is described, SLM and excitation wavelength laser high-speed refresh and switch, by layer-by-layer scanning refresh, and volume three-dimensional object image is constructed and displayed in volume three-dimensional display device, combined with the visual persistence characteristics of human eye, color volume three-dimensional display is realized, calculation and data volume are reduced, higher resolution can be realized than light field scanning volume three-dimensional, without moving mechanism, low cost and small volume.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of three-dimensional display, and particularly relates to a volumetric three-dimensional display system and a display method thereof. BACKGROUND

[0002] Volumetric three-dimensional display is one of the current three-dimensional (3D) display technology implementation methods, which realizes 3D effect by displaying real volumetric pixel points in space, so that multiple viewers can obtain information of different sides of the same 3D object from different angles. There are two main technologies, namely light field scanning volumetric three-dimensional and projection splicing light field volumetric three-dimensional, which utilize time division method and matrix method of projection display respectively, that is, the stereoscopic three-dimensional image is integrated in the human eye reaction time by utilizing the visual persistence of the human eye.

[0003] Light field scanning volumetric three-dimensional utilizes a high-speed projector and a directional diffusion screen to project and display three-dimensional light field for each viewing angle, so as to integrate a three-dimensional object image in the human eye. Projection splicing light field volumetric three-dimensional realizes spatial pixel angle reconstruction by the joint work of multiple projectors, and realizes light field volumetric three-dimensional display in combination with a directional diffusion element or a holographic functional screen. These two methods can realize large-angle and desktop volumetric three-dimensional display, but still have several problems.

[0004] (1) Light field scanning volumetric three-dimensional projects and displays light field for each viewing angle by a rotating directional diffusion screen, so that the input three-dimensional model needs to be calculated by light field projection with the same number of viewing angles, and the calculation amount and data amount are large, and the calculation and transmission rate are high. When the number and resolution of volumetric pixels of the three-dimensional model to be displayed are high, the calculation amount and data amount will be doubled, so it is difficult to realize dynamic volumetric three-dimensional display with high resolution and high frame rate.

[0005] (2) Light field scanning volumetric three-dimensional needs a high-speed projector for three-dimensional light field projection for each viewing angle, and the hardware cost is high. Moreover, due to the limitation of data transmission rate, the resolution of the high-speed projector is generally not high, resulting in low image resolution of light field scanning volumetric three-dimensional.

[0006] (3) Light field scanning volumetric three-dimensional needs a rotating directional diffusion screen, which has a moving mechanism, resulting in image jitter and noise.

[0007] (4) Projection splicing light field volumetric three-dimensional needs multiple projectors, complex directional diffusion screens and holographic functional screens. For example, 216 projectors are used by the University of Southern California to realize three-dimensional light field display of a real person size, which has high hardware cost and large volume, and is difficult to be productized and popularized. SUMMARY

[0008] In view of the above problems existing in the prior art, the present application provides a three-dimensional display system and a display method thereof, which realizes self-luminous, high-resolution, high-body-pixel-number color three-dimensional display by using a multi-layer fluorescent powder volume three-dimensional display device, does not need a moving mechanism and thus has no noise problem of scanning light field volume three-dimensional display, and has lower cost and smaller volume compared with scanning light field volume three-dimensional display and projection splicing light field volume three-dimensional display.

[0009] The present application is implemented by using the following technical solutions:

[0010] The present application provides a volume three-dimensional display system, which comprises:

[0011] The fluorescent powder volume three-dimensional display device is composed of N layers of fluorescent powder excitation light layers; each layer of fluorescent powder excitation light layer is composed of a coated glass and a fluorescent powder body pixel display unit arranged on the coated glass; wherein the coated glass is provided with a transmission film and a reflection film, the transmission range of the transmission film covers the wavelengths λ1 to λ N of the excitation laser of the first layer to the Nth layer, and the reflection wavelength range of the reflection film of the i-th layer of coated glass covers the wavelengths λ1 to λ i-1 of the excitation laser of the first layer to the (i-1)th layer;

[0012] The data processing and control module is used for reading three-dimensional model data, layering and layer image data processing of the three-dimensional model data according to the working mode, and transmitting the corresponding layer data to the SLM projection imaging module;

[0013] The fluorescent powder excitation laser light source module is used for controlling the data processing and control module to light up the laser of the required wavelength of the fluorescent powder excitation light layer in time sequence;

[0014] The SLM projection imaging module is used for realizing imaging of each layer based on the input laser of the fluorescent powder excitation laser light source module.

[0015] 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 in this invention, the phosphor three-dimensional display device consists of N phosphor excitation layers. Each phosphor excitation layer is composed of coated glass with a transmission film and a reflection film, and phosphor pixel display units arranged on the coated glass. The reflection wavelength of each layer's reflection film covers the wavelength of the excitation laser of the previous layer. Combined with the structure of the device, holographic diffraction imaging or projection imaging is performed through SLM. By combining the lasers of different excitation wavelengths of different layers in a time sequence, visible light wavelengths are excited on different layers of the phosphor three-dimensional display device. Each group of visible light is combined as a volume pixel to depict a layered color image of a three-dimensional object. The SLM and the excitation wavelength laser are refreshed and switched at high speed. By scanning and refreshing layer by layer, a volumetric three-dimensional image is constructed and displayed in the volumetric three-dimensional display device. Combined with the visual persistence characteristics of the human eye, color volumetric three-dimensional display is realized. The technical solution proposed in this invention is a volumetric 3D display technology that uses a spatial light modulator (SLM) to excite the light-emitting layers of a multi-layer phosphor structure in a volumetric 3D display device. By using diffraction holographic imaging or projection imaging, pixel-level light control is implemented on each layer of the excited light-emitting structure of the volumetric 3D display device, and corresponding volumetric 3D layered images are displayed on each layer. By high-speed layer-by-layer scanning and refreshing, a colored volumetric 3D image is integrated into the human eye. This is a color volumetric 3D display that can achieve self-illumination, high resolution, and a high number of volumetric pixels. Since no motion mechanism is required, there is no noise problem of scanning light field volumetric 3D. Moreover, it is lower in cost and smaller in size than scanning light field volumetric 3D and projection splicing light field volumetric 3D.

[0016] 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; the number of the phosphor pixel display units is determined according to the number of physical pixels of the SLM.

[0017] In some embodiments of the present invention, the excitation wavelength of the phosphor excitation layer is selected as follows: the wavelength is selected as the excitation laser wavelength from the intersection of the excitation wavelength ranges of the phosphors of each color in the layer; and the excitation wavelength ranges of different layers do not overlap.

[0018] In some embodiments of the present invention, in the phosphor pixel display unit, the dosage of phosphors of different colors is inversely proportional to the phosphor excitation brightness at the same wavelength.

[0019] In some embodiments of the present invention, in adjacent layers of the phosphor excitation layer, the front layer has less phosphor than the rear layer, so that the excitation light per unit laser intensity of the front layer is weaker than the excitation light per unit laser intensity of the rear layer.

[0020] In some embodiments of the present invention, the data processing and control module performs layered and layer image data processing on the three-dimensional model data, including:

[0021] For the holographic imaging mode, pixel color separation gray scale images are calculated for each layer image, the focusing 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 gray scale image of each layer, the holographic reconstruction distance, the parameter of the used SLM, and the excitation laser wavelength of the corresponding layer;

[0022] For the projection imaging mode, pixel color separation gray scale images are calculated for each layer image, the focusing depth information of each layer is calculated, and the lens focusing motor parameter is adjusted according to the focusing depth information of each layer.

[0023] In some embodiments of the present application, the SLM projection imaging module uses the laser input by the phosphor powder excitation laser light source module, in the holographic imaging mode, receives the incoming calculated hologram and loads it on the SLM, and realizes holographic imaging of different layers through the holographic imaging light path; in the projection imaging mode, receives the incoming pixel color separation gray scale image and loads it on the SLM, receives the focusing depth information and controls the focusing motor of the lens to adjust the imaging lens, so that the projection image is focused on the specified layer.

[0024] In some embodiments of the present application, in the phosphor powder excitation light layer, the phosphor powder light intensity is controlled by the gray scale value of the corresponding pixel of the pixel color separation gray scale image.

[0025] In some embodiments of the present application, the phosphor powder excitation light unit adopts RGBY, RGB, RGBYC or RGBC arrangement design for each color of phosphor powder.

[0026] The present application also proposes a kind of three-dimensional display method, it is applied to the three-dimensional display system as described above, comprising:

[0027] read three-dimensional model data, and according to working mode, three-dimensional model data is layered and layer data processing;

[0028] according to working mode, control SLM loads the calculated hologram or pixel color separation gray scale image that phosphor powder excitation light layer needs to display;Wherein, the calculated hologram is generated according to pixel color separation gray scale image;

[0029] laser focusing imaging in phosphor powder excitation light layer by calculated hologram or pixel color separation gray scale modulation, realize phosphor powder pixel level excitation;

[0030] each layer phosphor powder excitation light layer is integrated by human eye effect in phosphor powder three-dimensional display device and is composed of three-dimensional display object image by self-luminous body pixel.

[0031] Other features and advantages of the present application will become more apparent after reading the detailed description of the embodiments of the present application in conjunction with the accompanying drawings. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a system structure block diagram of the volumetric 3D display system proposed in this invention;

[0034] Figure 2 This is a schematic diagram of the data processing and control module in this invention;

[0035] Figure 3 This is a structural block diagram of the phosphor-excited laser light source module in this invention;

[0036] Figure 4 This is a structural block diagram of the SLM projection imaging module in this invention;

[0037] Figure 5 This is a schematic cross-sectional view of the fluorescent powder three-dimensional display device of the present invention;

[0038] Figure 6 This is a schematic diagram showing the phosphor distribution relationship of the phosphor excitation layer corresponding to the SLM pixel arrangement in this invention;

[0039] Figure 7 This is a schematic diagram of the depth information of the three-dimensional model layer in this invention;

[0040] Figure 8 This is a schematic diagram of the pixel color separation processing method in this invention;

[0041] Figure 9 This is a schematic diagram of the volumetric three-dimensional display method proposed in this invention. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] The volumetric three-dimensional display system proposed in this invention, such as Figure 1 As shown, it consists of a data processing and control module 1, a phosphor-excited laser light source module 2, an SLM (spatial light modulator) projection imaging module 3, and a phosphor three-dimensional display device 4.

[0044] In combination Figure 2 As shown in the figure, the data processing and control module 1 is used to read the input three-dimensional model data, and sequentially perform layering and layer image data processing on the three-dimensional model data according to the working mode.

[0045] For the holographic imaging mode, the layer images are color data separated, the gray scale images of each layer are subjected to gray scale balance for the brightness uniformity of each layer display, the focus depth information of each layer is calculated according to the number of layers and the distance of SLM from the display medium, and is matched to the holographic reconstruction distance of each layer, the fluorescent powder excitation wavelength of each layer is taken as the holographic recording wavelength of each layer, the calculated hologram of the pixel color separation gray scale image of each layer is obtained, and finally the hologram of each layer is sequentially loaded on the SLM. For the projection imaging mode, the gray scale images of the pixel color separation of each layer are obtained, the layer focus depth information is calculated and matched with each layer, and the parameters of the lens focusing motor are adjusted according to the focus depth information of each layer, so as to meet the data requirements of the projection imaging mode. The pixel color here is RGBY, RGB, RGBYC or RGBC.

[0046] The image and data corresponding to the working mode are transmitted to the SLM projection imaging module 3, and the fluorescent powder excitation laser light source module 2 is synchronized to light the excitation wavelength of the fluorescent powder of the current display layer.

[0047] In combination Figure 3 As shown in the figure, the fluorescent powder excitation laser light source module 2 is composed of a plurality of layers of fluorescent powder corresponding to the excitation wavelength of the laser, a laser heat sink, a laser driving circuit board and a laser beam expander collimator lens group. The fluorescent powder excitation laser light source module 2 is controlled by the data processing and control module 1, and the laser required for exciting each layer of fluorescent powder is sequentially lit, so as to assist the SLM projection imaging module 3 to focus and image on each layer of the fluorescent powder three-dimensional display device module 4, and excite the fluorescent powder of the current display layer to construct a pixel.

[0048] In combination Figure 4 As shown in the figure, the SLM projection imaging module 3 is composed of an SLM and its driving circuit board, an SLM heat sink, an SLM illumination light path, a projection imaging lens and its focusing motor, and a holographic imaging light path. The SLM projection imaging module 3 is controlled by the data processing and control module 1, uses the laser input by the fluorescent powder excitation laser light source 2, in the holographic imaging mode, receives the incoming calculated hologram and loads it on the SLM, and realizes holographic imaging of different layers through the holographic imaging light path; in the projection imaging mode, the SLM receives the RGBY, RGB, RGBYC or RGBC pixel color separation gray scale image and loads it on the SLM, receives the focus depth information and controls the high-speed lens focusing motor to adjust the imaging lens, so that the projection image is focused on the specified depth (layer), thereby realizing projection imaging of different layers.

[0049] In combination Figure 5As shown, the phosphor-based 3D display device 4 consists of a housing 51 and multiple phosphor-excited light-receiving layers. Each phosphor-excited light-receiving layer is composed of coated glass 521, RGBY / RGB / RGBYC / RGBC phosphors 522, and phosphor sol 523. When the phosphor-excited laser light source module 2 illuminates the laser of the excitation wavelength of the i-th layer of phosphors, and the SLM projection imaging module 3 projects or holographically focuses the pixel color separation grayscale image of the i-th layer of the 3D model, the image focused on the i-th layer of phosphors in the phosphor-based 3D display device is the pixel color separation grayscale image of the i-th layer of the 3D model. Since the pixels of the pixel color separation grayscale image correspond one-to-one with the phosphors, the laser of the excitation wavelength of the i-th layer of phosphors modulated by the pixel color separation grayscale image can excite the i-th layer of phosphors to emit light. The phosphor luminescence intensity is controlled by the grayscale value of the corresponding pixel in the pixel color separation grayscale image. Because the i-th layer of phosphors is composed of RGBY / RGB / RGBYC / RGBC phosphors and the phosphors are related to the pixel color separation grayscale image... Figure 1 In a one-to-one correspondence, the phosphor can emit light combinations in the visible light band when excited. Each light combination depicts a volume pixel in the i-th layer. The display of many volume pixels together can depict the color layer image of the three-dimensional model. The phosphors in each layer are excited and refreshed in sequence, and the three-dimensional display effect is presented in the human eye through the integration effect of the human eye.

[0050] The outer shell, as described above, includes, but is not limited to, glass, transparent resin, and transparent plastic. In coated glass, "glass" refers to any coated, transparent optical glass material. "Phosphor" includes, but is not limited to, excited-light materials such as excited-light phosphors. "Phosphor sol" refers to any adhesive material used in the processing and fixing of excited-light materials such as excited-light phosphors.

[0051] In this invention, the phosphors of each color in the phosphor pixel display unit can be arranged in an RGBY pattern, or in various patterns such as RGB, RGBYC, and RGBC.

[0052] The coated glass consists of an anti-reflection coating and a total reflection coating, with the first layer containing only an anti-reflection coating. The anti-reflection coating ranges from the first layer to the Nth layer, covering wavelengths λ1 to λ2 for excitation laser light. N This corresponds to the excitation laser wavelengths of each layer within the phosphor-excited laser light source module 2. The total internal reflection wavelength ranges of each layer of coated glass are different: the reflection wavelength range of the i-th layer of coated glass covers the excitation laser wavelengths λ1 to λ2 of layers 1 to (i-1). i-1 The coated glass utilizes antireflective and total reflection films to allow only the corresponding excitation wavelength of laser light to pass through and excite the phosphor of each layer, thereby realizing independent excitation and emission of each layer and volume pixel display within the phosphor 3D display device 4. At the same time, the coated glass acts as an interlayer spacer to avoid the aliasing of volume pixels in adjacent layers.

[0053] The excitation wavelength of the phosphor powder is an interval, the excitation wavelength intervals of the single layer of phosphor powder intersect with each other, in the application, the 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 the excitation wavelength intervals do not intersect, so as to avoid the cases of excitation error and multi-layer simultaneous excitation.

[0054] The single layer of phosphor powder may have the case that the same wavelength excitation brightness is different, the dose ratio of different color phosphor powders can be balanced to make the phosphor powder of any volume pixel imaging unit be excited to emit red, green, blue and yellow light with equal visual brightness when being irradiated by the laser with unit brightness excitation wavelength, and the standard color volume pixel display is realized.

[0055] The light intensity is attenuated when the light propagates through the layers of the phosphor powder three-dimensional display device 4, in order to solve this problem, in the application, the amount of phosphor powder in the front layer is less than that in the rear layer in the adjacent layers, so that the excitation light with unit laser intensity in the front layer is weaker than that in the rear layer, and the unit phosphor powder dose (the ratio of each color phosphor powder) of different layers is balanced and adjusted to realize the equal brightness display of different layers of volume pixels.

[0056] The balanced and matched RGBY phosphor powder is arranged in the volume pixel imaging unit, is sparsely and regularly dissolved and fixed in the phosphor sol, and the influence of the front side layer on the rear side layer of the phosphor powder three-dimensional display device is further reduced.

[0057] The distribution of the phosphor powder excited by the excitation light layer of the phosphor powder three-dimensional display device is determined by the pixel arrangement type of the used SLM. Taking the pixel color as RGBY as an example, the phosphor powder layer regards the four color phosphor powders as a volume pixel display unit 61, and the SLM regards four pixels as a volume pixel imaging unit 62. The volume pixel display unit 61 corresponds to the volume pixel imaging unit 62 one by one, and the four color phosphor powders in the volume pixel display unit 61 correspond to the four pixels in the volume pixel imaging unit 62 one by one. The number of volume 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 is a square pixel arrangement, the distribution of the phosphor powder layer is as shown in Figure 6 .

[0058] In combination with the above structure, taking the pixel color as RGBY as an example, the working of the system is explained, as shown in Figure 9 , which includes:

[0059] S91: The system starts with self-checking, and then selects the working mode according to the hardware peripherals: holographic imaging mode or projection imaging mode.

[0060] S92: The volume three-dimensional layer number N is determined according to the layer laser number of the phosphor powder excitation laser light source module 2 and the phosphor powder excitation light layer number of the phosphor powder three-dimensional display device 4.

[0061] S93: Data processing and control module 1 reads the input 3D model data and divides it into N layers based on the 3D model depth information.

[0062] Among them, such as Figure 7 As shown, the depth focusing information of the i-th phosphor excitation layer 72 is the sum of the distance D between the SLM 71 and the phosphor three-dimensional display device 4 and the interlayer spacing d*i of the phosphor three-dimensional display device.

[0063] S94: Data processing and control module 1 performs pixel color separation on the obtained N-layer layered image.

[0064] First, extract the number of horizontal and vertical pixels from the original layered image and create an empty image template P with double the number of horizontal and vertical pixels from the original image. Establish the pixel correspondence between the original image and the empty image template P, that is, any pixel in the original image corresponds to 4 pixels in the empty image template P at the same position in the original image. Figure 8 As shown,

[0065] Next, iterate through all pixels of the original image and extract the grayscale values ​​g of red, green, blue, and yellow for each pixel in sequence. R g G g B b Y The four grayscale values ​​are then placed into the four adjacent pixels at the corresponding positions in the empty image template P, thereby constructing a volume pixel imaging unit for SLM. If other phosphor pixel display units with arrangements such as RGB, RGBYC, or RGBC are used, pixel color separation processing corresponding to the color arrangement is employed.

[0066] Finally, after iterating through all pixels of the image, a volume pixel imaging unit with the same number of pixels is obtained, thus obtaining the pixel color separation grayscale image of a certain layer of the 3D model, such as... Figure 8 As shown.

[0067] S95: Data processing and control module 1 controls phosphor-excited laser source module 2 to illuminate the first layer of phosphor-excited laser. In projection imaging mode, projection imaging module 3 controls SLM to load the first layer of pixel color separation grayscale image. In holographic imaging mode, projection imaging module 3 controls SLM to load the calculated hologram of the pixel color separation grayscale image.

[0068] In projection imaging mode, the system illuminates the first layer of phosphor-excited laser in phosphor-excited laser light source module 2 with a laser wavelength of λ1. The pixel color separation grayscale image of the first layer of the 3D model is loaded onto the SLM. At the same time, the focusing 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 3D display device.

[0069] If it is a holographic imaging mode, the system lights up the first layer of the phosphor powder excitation laser of the phosphor powder excitation laser light source module, the wavelength of the laser is λ1, and the calculated hologram of the pixel color separation gray scale image of the first layer is obtained using the algorithm of the calculated hologram. In the algorithm, λ1 is used as the holographic recording / reconstruction laser wavelength, the depth focusing data of the first layer is used as the holographic recording / reconstruction distance, and the pixel color separation gray scale image of the first layer is used as the target image of the holographic recording / reconstruction. The obtained first layer calculated hologram is loaded on the SLM, and λ1 is used as the illumination (holographic reconstruction) light. The holographic reconstruction and the convergent imaging property are used to focus the pixel color separation gray scale image of the first layer on the first layer of the phosphor powder three-dimensional display device.

[0070] S96: The laser of the first layer phosphor powder excitation wavelength modulated by the pixel color separation gray scale image is focused on the first layer of the phosphor powder of the phosphor powder three-dimensional display device, realizing the point-to-point pixel-level excitation of the phosphor powder. The excitation light intensity of the phosphor powder is controlled by the gray scale of the pixel color separation gray scale image, and the phosphor powder emits colored light (red, green, blue, and yellow light) in the visible light band. The colored light combines to jointly depict a volume pixel. The phosphor powder distributed in the layer array depicts all volume pixels in the layer.

[0071] S97: The second, …, i, …, N layers of volume pixels are displayed in sequence and high speed refresh. Through the human eye integration (temporary retention) effect, the free light-emitting volume pixel group can be observed in the phosphor powder three-dimensional display device 4.

[0072] The wavelength of the projection imaging or holographic imaging is λ i The pixel color separation gray scale image of the i-th layer is focused on the i-th layer of the phosphor powder of the phosphor powder three-dimensional display device 4. The volume pixel imaging unit of the SLM and the loaded pixel color separation gray scale image is one-to-one corresponding to the volume pixel display unit of the i-th layer of the phosphor powder. The gray scale image RGBY pixel element in the unit is one-to-one corresponding to the RGBY phosphor. Since λ i is the excitation laser of the i-th layer of RGBY phosphor, the i-th layer of RGBY phosphor is excited by the pixel-level precision of the pixel color separation gray scale image. Any volume pixel display unit constructs a colored volume pixel, thereby realizing the display of the colored volume pixel of the i-th layer. The system displays the first layer to the Nth layer in sequence and high speed refresh, thereby integrating the volume three-dimensional display effect in the human eye.

[0073] It should be noted that in the specific implementation process, the above-mentioned method part can be realized by a processor in the form of hardware executing computer execution instructions in the form of software stored in the memory. The programs corresponding to the actions executed can be stored in the computer readable storage device of the system in the form of software, so that the processor calls and executes the operations of the above various modules corresponding to the programs.

[0074] The computer readable storage mentioned above can include volatile memory, such as random access memory; can also include non-volatile memory, such as read-only memory, flash memory, hard disk or solid state disk; and can also include a combination of the above kinds of memory.

[0075] The processor mentioned above can also be a collective term of a plurality of processing elements. For example, the processor can be a central processing unit, or can be 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. The general-purpose processor can be a microprocessor or can be any conventional processor, etc., and can also be a special-purpose processor.

[0076] It should be noted that the above description is not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the spirit and scope of the present application should also be within the protection scope of the present application.

Claims

1. A volumetric three-dimensional display system, characterized in that, include: A phosphor-based three-dimensional display device consists of N phosphor excitation layers; each phosphor excitation layer comprises coated glass and phosphor pixel display units disposed on the coated glass; wherein the coated glass is equipped with a transmission film and a reflection film, the transmission range of which covers the wavelengths λ1 to λ2 of the excitation laser from the 1st to the Nth layers. N The reflection wavelength range of the i-th coated glass reflective film covers the wavelengths λ1 to λ2 of the excitation laser from the 1st to the (i-1)th layers. i-1 ; The data processing and control module is used to read 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-excited laser light source module is used to illuminate the phosphor excitation layer with laser of the required wavelength according to the timing sequence, under the control of the data processing and control module. The SLM projection imaging module is used to achieve imaging of each layer based on the laser input from the phosphor-excited laser source module; The excitation wavelength of the phosphor-excited light-emitting layer is selected as follows: The excitation wavelength of the phosphor is within a range. The excitation wavelength ranges of the phosphors in a single layer overlap with each other. The wavelength is selected as the excitation laser wavelength from the intersection of the excitation wavelength ranges of the phosphors of different colors in the layer. Furthermore, the excitation wavelength ranges of different layers do not overlap; In the phosphor pixel display unit, by balancing the metering ratio of different colored phosphors, the phosphors of any pixel imaging unit are excited to emit light of different colors with the same visual brightness when irradiated by a laser of excitation wavelength per unit brightness. In the adjacent layers of the phosphor excitation layer, the front layer has less phosphor than the rear layer, so that the excitation light per unit laser intensity of the front layer is weaker than the excitation light per unit laser intensity of the rear layer.

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 phosphor pixel display units is determined based on the number of physical pixels in the SLM.

3. The volumetric three-dimensional display system according to claim 1, characterized in that, The data processing and control module performs layered and layer image data processing on the 3D model data, including: For the holographic imaging mode, pixel color separation grayscale images are calculated for each layer of the image, focusing depth information of each layer is calculated and matched with the holographic reconstruction distance of each layer, and holograms of each layer are calculated and generated based on the pixel color separation grayscale images of each layer, holographic reconstruction distance, parameters of the SLM used, and excitation laser wavelength of the corresponding layer. For projection imaging mode, pixel color separation grayscale images are calculated for each layer of image, focus depth information for each layer is calculated, and lens focusing motor parameters are adjusted according to the focus depth information for each layer.

4. 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 light source module. In holographic imaging mode, it receives the input calculated hologram and loads it onto the SLM, realizing holographic imaging of different layers through the holographic imaging optical path. In projection imaging mode, it receives the input pixel color separation grayscale image and loads it onto the SLM, receives focus depth information and controls the lens focusing motor to adjust the imaging lens so that the projected image is focused on the specified layer.

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

6. The volumetric three-dimensional display system according to claim 1, characterized in that, The phosphors of each color in the phosphor-excited layer are arranged in RGBY, RGB, RGBYC, or RGBC configurations.

7. A volumetric 3D display method, applied to the volumetric 3D display system as described in 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; The phosphor excitation laser source corresponding to the wavelength of the phosphor-excited light-emitting layer is lit according to the timing control, and the SLM is controlled to load the computational hologram or pixel color separation grayscale image to be displayed on the phosphor-excited light-emitting layer according to the working mode; wherein, the computational hologram is generated based on the pixel color separation grayscale image; Laser focusing imaging modulated by a calculated hologram or pixel color separation grayscale image is applied to the phosphor excitation layer to achieve pixel-level excitation of the phosphor. Each layer of phosphor, when excited, is integrated by the human eye and forms a three-dimensional image of the object in the phosphor three-dimensional display device by self-emissive pixels.

Images