Composite light field display system and display method

Abstract

The invention relates to the field of display, in particular to a composite light field display system and method, and the display system comprises a directional illumination subsystem, a regional compression light field display subsystem, a projection array subsystem, a field lens and a real-time calculation and control subsystem. The regional compressed light field display subsystem comprises at least two display regions, and the at least two display regions are used for displaying at least two compressed light field images corresponding to at least two different observation angle ranges of the same three-dimensional scene; the directional illumination subsystem is used for emitting illumination light, the illumination light is modulated by the regional compressed light field display subsystem and then penetrates through the projection array subsystem to form a composite light field in a space, the composite light field passes through a scene to form an observation area in the space, and the observation area comprises more than two sub observation areas; the real-time calculation and control subsystem is used for calculating compressed light field images corresponding to at least two observation angles and inputting the compressed light field images into the display areas of the regional compressed light field display subsystems; and the directional illumination subsystem and the regional compressed light field display subsystem are controlled to work coordinately and output a three-dimensional image.

Description

Technical Field

[0001] The present invention relates to the field of display, and in particular to a composite light field display system and a display method. Background Art

[0002] Light field display technology can achieve realistic and natural 3D display effects and is considered to be one of the most promising 3D display technologies. Among them, compressed light field display technology has attracted widespread interest due to its simple system structure and compatibility with existing flat panel display technology. Compressed light field technology is based on the principle of four-dimensional light field. It uses mathematical methods to compress and decompose a large amount of light field information into discrete multi-layer two-dimensional images, and then uses a multi-layer flat display system to output multi-layer two-dimensional images to reconstruct the light field information of the three-dimensional scene and realize 3D display. This technology improves the utilization of the spatial bandwidth of the display system at the cost of increasing the amount of calculation, thereby improving the resolution and depth of field of the image. With the improvement of computing technology and display hardware, compressed light field technology has received more and more attention.

[0003] Due to principle limitations, the field of view of traditional compressed light field display systems is small, and there is a restrictive relationship between parameters such as image resolution, field of view, and depth of field. There are two existing solutions to improve compressed light field technology: one is to improve image quality within a limited field of view through optimization algorithms and improve computing efficiency. The other is to combine high-bandwidth technology to expand the spatial bandwidth of the display system, thereby improving the display effect. Although these two solutions have greatly improved image quality, they still fail to overcome the limitations of traditional compressed light fields, and the viewing angle and depth of field of the displayed images cannot meet actual needs. Summary of the invention

[0004] In view of this, an object of the present invention is to overcome the shortcomings of the background technology and provide a composite light field display system and display method with a large viewing angle, high resolution and large depth of field.

[0005] In a first aspect, the present application provides a composite light field display system, comprising: a directional lighting subsystem, a regional compressed light field display subsystem, a projection array subsystem, a field mirror, and a real-time calculation and control subsystem, wherein the regional compressed light field display subsystem comprises at least two display areas, and the at least two display areas are used to display at least two compressed light field images corresponding to at least two different observation angle ranges of the same three-dimensional scene; the directional lighting subsystem is used to emit illumination light, which is modulated by the regional compressed light field display subsystem and then passes through the projection array subsystem to form a composite light field in space, wherein the composite light field forms a three-dimensional scene and its observation area in space, and the observation area comprises more than two sub-observation areas; the real-time calculation and control subsystem is used to calculate the compressed light field images corresponding to the at least two observation angle ranges, and input the compressed light field images into the display area of ​​the regional compressed light field display subsystem, and control the directional lighting subsystem and the regional compressed light field display subsystem to coordinate and output a three-dimensional image.

[0006] The light field with a large viewing angle forms a designated observation area in space through a field lens and other auxiliary elements.

[0007] The projection array subsystem includes at least two projection channels, and the sub-observation areas of the compressed light fields projected by adjacent projection channels are spliced ​​with each other; optionally, the display areas are arranged in a one-to-one correspondence with the projection channels.

[0008] The projection channel includes a lens or lens group for aberration correction. The arrangement of the projection channel is the same as that of the display area.

[0009] The regional compressed light field display subsystem includes at least two flat display screens.

[0010] Wherein, at least two flat display screens are arranged in a stacked manner.

[0011] Wherein, the planes where at least two display screens are located form a certain angle.

[0012] Wherein, the planes where at least two display screens are located are vertically arranged.

[0013] At least two flat display screens are stacked on each other through real images formed by the directional lighting subsystem and the compressed light field image.

[0014] The arrangement of at least two display areas includes one or a combination of two or more of an orthogonal arrangement, a honeycomb arrangement, and a staggered arrangement; optionally, the arrangement of the projection channels is the same as that of the display areas.

[0015] The directional lighting subsystem includes a light source and a collimating lens, and the light source forms collimated light or convergent light through the collimating lens.

[0016] Optionally, the light source includes an LED light source;

[0017] Optionally, the light source includes an array light source, which includes a plurality of LED units; the collimating lens includes a collimating lens array, which includes a plurality of lens units; and the projection of the lens unit on the plane where the array light source is located covers at least one LED unit.

[0018] The directional lighting subsystem is preferably composed of an LED light source and a single large-aperture collimating lens, and the LED light source forms a collimated backlight or a convergent backlight through the large-aperture collimating lens to illuminate the display subsystem.

[0019] The real-time computing and control subsystem is connected to the lighting subsystem and the display subsystem, and the real-time computing and control subsystem includes a CPU, a GPU or a cluster thereof. The real-time computing and control subsystem receives multi-view image information of a three-dimensional scene, and compresses the multi-view image information into multiple compressed light field image information through least squares method, non-negative tensor decomposition method, tomography algorithm and machine learning algorithms.

[0020] The second aspect of the present application also includes a composite light field display method, using the composite light field display system mentioned above, the composite light field display method includes:

[0021] Acquire compressed light field information of at least two angle ranges of a three-dimensional scene to be formed;

[0022] Inputting the compressed light field information into at least two display areas of the sub-area compressed light field display subsystem, and projecting the compressed light field into a three-dimensional space using a directional lighting subsystem and a projection array subsystem to form at least two sub-observation areas;

[0023] The at least two sub-observation areas are spliced ​​to form a three-dimensional scene.

[0024] Wherein, obtaining compressed light field information of at least two angle ranges of the three-dimensional scene to be formed includes:

[0025] Collect multi-view image information to form a three-dimensional scene:

[0026] Grouping multi-view images by observation sub-regions;

[0027] Each group of multi-view images is compressed and decomposed to form multiple compressed light field images.

[0028] The acquisition of multi-view image information to form a three-dimensional scene includes: acquisition with a dense virtual or actual camera array, or acquisition with a sparse virtual or actual camera and the use of an algorithm to synthesize images acquired by the dense camera array.

[0029] The different display areas refer to different areas on a two-dimensional plane perpendicular to the depth direction. The directional backlight has a settable divergence angle, and the directional backlights in different areas have different lighting directions. The directional backlights in different areas converge in their respective corresponding sub-observation areas.

[0030] Among them, the sub-observation areas formed by the multiple projection channels can be independent of each other and can partially overlap. Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0031] 1. For the first time, a composite light field display system and display method are proposed, which overcomes the problem of limited viewing angle of traditional compressed light field display and greatly improves the viewing angle of the display system.

[0032] 2. The use of composite light field overcomes the problems of low angular resolution and discontinuous parallax jumps in traditional array light field display systems, and obtains continuous motion parallax within a large viewing angle range.

[0033] 3. By taking advantage of the composite light field, the utilization rate of the display system bandwidth is greatly improved, and a wide viewing angle, high resolution, continuous and smooth three-dimensional display effect is achieved.

[0034] 4. The composite light field display system integrates compressed light field and array light field technology, using compressed light field to improve the utilization rate of the spatial bandwidth of the display system, while using array light field to greatly improve the viewing angle of the display system, thereby significantly improving the quality of light field reconstruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of a first embodiment of a composite light field display system of the present application;

[0036] Figure 2 is a schematic diagram of a second embodiment of the composite light field display system of the present application;

[0037] Figure 3 is a schematic diagram of a third embodiment of the composite light field display system of the present application;

[0038] Figure 4 is a schematic diagram of a fourth embodiment of the composite light field display system of the present application;

[0039] Figure 5 It is a schematic diagram of the fifth embodiment of the composite light field display system of the present application.

[0040] FIG6(a) is an orthogonally arranged sub-LED array, FIG6(b) is a circular honeycomb arranged sub-LED array, FIG6(c) is a hexagonal honeycomb arranged sub-LED array, and FIG6(d) is a staggered arranged sub-LED array.

[0041] Figure 7 A schematic diagram of a process of a composite light field display method of the present application;

[0042] Figure 8 A schematic diagram of a process of obtaining compressed light field information of at least two angle ranges of a three-dimensional scene to be formed in the composite light field display method of the present application. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the figures and embodiments:

[0044] Embodiment 1:

[0045] See also Figure 1 , is a schematic structural diagram of a composite light field display system in this embodiment.

[0046] The composite light field display system in this embodiment includes a directional lighting subsystem 1, a regional compressed light field display subsystem 2, a projection array subsystem 3, a field lens 4, and a real-time calculation and control subsystem 5.

[0047] In one embodiment of the present application, the directional lighting subsystem 1 includes an LED array 11 and a corresponding collimating lens array 12. The LED array 11 is located on the focal plane of the collimating lens array 12. Figure 1As shown in FIG. 6( a), the LED array 11 is composed of a plurality of orthogonally arranged sub-LED arrays 111, each of which has orthogonally arranged LED units arranged therein. The collimating lens array 12 is composed of a plurality of orthogonally arranged sub-collimating lenses 121. The sub-LED array 111 and the sub-collimating lens 121 constitute a directional lighting unit 13. Each LED unit in the sub-LED array 111 can be independently controlled, and directional lighting light in the corresponding direction is emitted when a certain LED unit is lit. The directional lighting subsystem 1 illuminates the sub-regional compressed light field display subsystem 2, and the sub-regional compressed light field display subsystem 2 includes two layers of LCD display screens 21 and 22 at a certain distance from each other. The compressed light field display subsystem 2 is divided into a plurality of orthogonally arranged display areas 23. Specifically, in the embodiment of the present application, three orthogonally arranged display areas 23 are included. In other embodiments, other numbers of display areas 23 may also be included, for example, four or five or more. The display area 23 is composed of a corresponding area 211 on the display screen 21 and a corresponding display area 221 on the display screen 22. The display area 23 is illuminated by the corresponding directional lighting unit 13. The light passes through the sub-regional compressed light field display subsystem 2 and enters the projection array subsystem 3. The composite light field 6 is formed in space through the projection array subsystem 3. The composite light field 6 passes through the field lens 4 to form an observation area 7 in space. The observation area 7 is composed of more than two different sub-observation areas 71. The real-time calculation and control subsystem 5 connects the directional lighting subsystem 1 and the sub-regional compressed light field display subsystem 2. The real-time calculation and control subsystem 5 uses the least squares method to decompose the compressed light field of each display area 23 at high speed and coordinates the control of the lighting subsystem 1 and the output of the display subsystem 2 to achieve stable display of the system.

[0048] The directional lighting subsystem 1 emits light to illuminate the compressed light field display subsystem 2 in different regions. The compressed light field display subsystem 2 in different regions displays images corresponding to different compressed light fields in different regions. The illumination light enters the projection array subsystem after being modulated by the compressed light field display subsystem 2. The projection array subsystem is composed of an array formed by multiple different projection channels. The compressed light field information of each region of the compressed light field display subsystem 2 is projected to a specified angle space through a projection channel matched therewith. The light fields output by each projection channel of the projection array are spliced ​​together in space to form a light field with a large viewing angle.

[0049] Embodiment 2:

[0050] See also Figure 2 , is a schematic structural diagram of a composite light field display system in this embodiment.

[0051] The composite light field display system in this embodiment includes a directional lighting subsystem 1, a regional compressed light field display subsystem 2, a projection array subsystem 3, a field lens 4, and a real-time calculation and control subsystem 5. The directional lighting subsystem 1 is composed of an LED array 11 and a corresponding collimating lens array 12, and the LED array 11 is located on the focal plane of the collimating lens array 12. The LED array 11 is composed of a number of sub-LED arrays 111 arranged in a honeycomb shape as shown in FIG6(b), and the collimating lens array 12 is composed of a number of sub-collimating lenses 121 arranged in a honeycomb shape. The sub-LED array 111 and the sub-collimating lens 121 constitute a directional lighting unit 13. In other embodiments, as shown in FIG6(a), the LED array 11 may also include sub-LED arrays 111 arranged orthogonally, or sub-LED arrays 111 arranged in a staggered manner as shown in FIG6(d). In the embodiment of the present application, the sub-LED array 111 arranged in a honeycomb shape is a circular honeycomb shape, and in other embodiments, as shown in FIG6(c), it is a sub-LED array arranged in a hexagonal honeycomb shape.

[0052] In the implementation manner of the present application, each LED unit in the LED array can be independently controlled, and when a certain LED unit is lit, directional lighting light in the corresponding direction is emitted.

[0053] In the embodiment of the present application, the directional lighting subsystem 1 illuminates the sub-regional compressed light field display subsystem 2, and the sub-regional compressed light field display subsystem 2 is composed of three layers of LCD display screens 21, 22 and 24 at a certain distance. The compressed light field display subsystem 2 is divided into a plurality of display areas 23 arranged in a honeycomb shape, and the display area 23 is composed of a corresponding display area 211 on the LCD display screen 21, a corresponding display area 221 on the LCD display screen 22, and a corresponding display area 241 on the LCD display screen 24. The display area 23 is illuminated by the corresponding directional lighting unit 13. After passing through the sub-regional compressed light field display subsystem 2, the light enters the projection array subsystem 3, and forms a composite light field 6 in space through the projection array subsystem 3. The composite light field 6 forms an observation area 7 in space through the field lens 4, and the observation area 7 is composed of different sub-observation areas 71. The real-time calculation and control subsystem 5 connects the directional lighting subsystem 1 and the sub-regional compressed light field display subsystem 2. The real-time calculation and control subsystem 5 uses non-negative tensor decomposition to decompose the compressed light field of each display area at high speed and coordinates and controls the directional lighting subsystem lighting and display output. In other embodiments, the LCD display screens 21, 22, 23 may also be partially LED or OLED display screens.

[0054] Embodiment 3:

[0055] See also Figure 3 , is a schematic structural diagram of a composite light field display system in this embodiment.

[0056] The composite light field display system in this embodiment includes directional lighting subsystems 1A and 1B, a regional compressed light field display subsystem 2, projection array subsystems 3A and 3B, a field lens 4, a real-time calculation and control subsystem 5, a semi-transparent and semi-reflective mirror 8, and scattering screens 91 and 92.

[0057] In the embodiment of the present application, the directional lighting subsystems 1A and 1B are arranged perpendicular to each other. The internal structures of the directional lighting subsystems 1A and 1B are the same. Take the directional lighting subsystem 1A as an example: the directional lighting subsystem 1A is composed of an LED array 11 and a corresponding collimating lens array 12, and the LED array 11 is located on the focal plane of the collimating lens array 12. The LED array is composed of a number of sub-LED arrays 111 arranged in a honeycomb shape, and the collimating lens array 12 is composed of a number of sub-collimating lenses 121 arranged in a honeycomb shape. The sub-LED array 111 and the sub-collimating lens 121 constitute a directional lighting unit 13. Each LED unit in the LED array can be independently controlled, and directional lighting light in the corresponding direction is emitted when a certain LED unit is lit.

[0058] In the embodiment of the present application, the directional lighting subsystem 1 illuminates the sub-regional compressed light field display subsystem 2, and the sub-regional compressed light field display subsystem 2 is composed of an LCD display screen 21 and an LCD display screen 22 which are arranged perpendicular to each other.

[0059] The compressed light field display subsystem 2 is divided into a plurality of display areas 23 arranged in a honeycomb shape. The display area 23 is composed of a corresponding display area 211 on the LCD display screen 21 and a corresponding display area 221 on the LCD display screen 22 .

[0060] The display area 23 is illuminated by the corresponding directional lighting unit 13. The light passes through the sub-regional compressed light field display subsystem 2 and enters the projection array subsystem 3, which is composed of projection arrays 3A and 3B arranged perpendicular to each other. The projection array 3A projects the light information 61 onto the scattering screen 91, and the projection array 3B projects the light information 62 onto the scattering screen 92. The light information 61 forms its virtual image 611 in space through the semi-transparent and semi-reflective mirrors. The light information 62 and 611 form a composite light field 6 in space.

[0061] The composite light field 6 forms an observation area 7 in space through the field lens 4, and the observation area 7 is composed of different sub-observation areas 71. The real-time calculation and control subsystem 5 connects the directional lighting subsystems 1A, 1B and the sub-regional compressed light field display subsystem 2. The real-time calculation and control subsystem 5 uses a tomographic algorithm to quickly decompose the compressed light field of each display area and coordinately control the lighting and display output of the directional lighting subsystems 1A and 1B.

[0062] Embodiment 4:

[0063] See also Figure 4 , is a schematic structural diagram of a composite light field display system in this embodiment.

[0064] The composite light field display system in this embodiment includes directional lighting subsystems 1A and 1B, a regional compressed light field display subsystem 2, projection array subsystems 3A and 3B, a field lens 4, a real-time calculation and control subsystem 5, a semi-transparent and semi-reflective mirror 8, and scattering screens 91 and 92. The directional lighting subsystems 1A and 1B are arranged perpendicular to each other. The internal structures of the directional lighting subsystems 1A and 1B are the same. Taking the directional lighting subsystem 1A as an example: the directional lighting subsystem 1A is composed of an LED array 11 and a corresponding collimating lens array 12, and the LED array 11 is located on the focal plane of the collimating lens array 12. The LED array is composed of a plurality of staggered sub-LED arrays 111, and the collimating lens array 12 is composed of a plurality of staggered sub-collimating lenses 121. The sub-LED array 111 and the sub-collimating lens 121 constitute a directional lighting unit 13. Each LED unit in the LED array can be independently controlled, and directional lighting light in the corresponding direction is emitted when a certain LED unit is lit. In other embodiments, the internal structures of the directional lighting subsystems 1A and 1B may also be different.

[0065] The directional lighting subsystem 1 illuminates the sub-regional compressed light field display subsystem 2, and the sub-regional compressed light field display subsystem 2 includes an LCD display screen 21 and LCD display screens 22 and 24, wherein the LCD display screens 22 and 24 are arranged in parallel, and the LCD display screen 22 and the LCD display screen 21 are arranged perpendicular to each other.

[0066] The compressed light field display subsystem 2 is divided into a plurality of staggered display areas 23 , which are composed of a corresponding display area 211 on the display screen 21 , a corresponding display area 221 on the display screen 22 , and a corresponding display area 241 on the display screen 24 .

[0067] The display area 23 is illuminated by the corresponding directional lighting unit 13. The light passes through the sub-regional compressed light field display subsystem 2 and enters the projection array subsystem 3, which is composed of projection arrays 3A and 3B arranged perpendicular to each other. The projection array 3A projects the light information 61 onto the scattering screen 91, and the projection array 3B projects the light information 62 and 63 near the scattering screen 92. The light information 61 forms its virtual image 611 in space through the semi-transparent and semi-reflective mirrors. The light information 62, 63 and 611 form a composite light field 6 in space.

[0068] The composite light field 6 forms an observation area 7 in space through the field lens 4, and the observation area 7 is composed of different sub-observation areas 71. The real-time calculation and control subsystem 5 connects the directional lighting subsystems 1A, 1B and the sub-regional compressed light field display subsystem 2. The real-time calculation and control subsystem 5 uses a machine learning algorithm to quickly decompose the compressed light field of each display area and coordinate the control of the directional lighting subsystem lighting and display output.

[0069] Embodiment 5:

[0070] See also Figure 5 , is a schematic structural diagram of a composite light field display system in this embodiment.

[0071] The composite light field display system in this embodiment includes a directional lighting subsystem 1, a regional compressed light field display subsystem 2, a projection array subsystem 3, a field lens 4, and a real-time calculation and control subsystem 5. The directional lighting subsystem 1 includes a high-power LED 14 and a corresponding collimating lens 15. The LED 14 is located outside one focal length of the collimating lens 15 to form a convergent backlight. When the LED unit is lit, the system emits directional lighting light with a convergent trend. The directional lighting subsystem 1 illuminates the regional compressed light field display subsystem 2, and the regional compressed light field display subsystem 2 is composed of two layers of LCD display screens 21 and 22 at a certain distance. The compressed light field display subsystem 2 is divided into a number of orthogonally arranged display areas 23, and the display area 23 is composed of a corresponding area 211 on the display screen 21 and a corresponding display area 221 on the display screen 22. The display area 23 is illuminated by the corresponding part of the directional lighting subsystem 1. The light passes through the sub-regional compressed light field display subsystem 2 and enters the projection array subsystem 3, and forms a composite light field 6 in space through the projection array subsystem 3. The composite light field 6 passes through the field lens 4 to form an observation area 7 in space, and the observation area 7 is composed of different sub-observation areas 71. The real-time calculation and control subsystem 5 connects the directional lighting subsystem 1 and the sub-regional compressed light field display subsystem 2. The real-time calculation and control subsystem 5 uses the least squares method to decompose the compressed light field of each display area at high speed and coordinate the control of the directional lighting subsystem lighting and display output.

[0072] Example 6: (Please modify according to the content of the invention)

[0073] See also Figure 7 and Figure 8 FIG. 1 is a flow chart showing a specific implementation of a composite light field display method in this embodiment. The composite light field display method includes:

[0074] S710: Obtain compressed light field information of at least two angle ranges of a three-dimensional scene to be formed.

[0075] In an embodiment of the present application, multiple compressed light fields of the same three-dimensional scene are generated in a set observation area, and the multiple compressed light fields respectively correspond to different observation angle ranges of the same three-dimensional scene, and each compressed light field corresponds to a sub-observation area.

[0076] S720: Input the compressed light field information into at least two display areas of the regional compressed light field display subsystem, and use the directional lighting subsystem backlight and the projection array subsystem to project the compressed light field into a three-dimensional space to form at least two sub-observation areas.

[0077] In the implementation manner of the present application, the different display areas of the display system refer to different areas on a two-dimensional plane perpendicular to the depth direction. The directional backlight has a settable divergence angle, and the directional backlights in different areas have different lighting directions. The directional backlights in different areas converge in their respective corresponding sub-observation areas.

[0078] In an embodiment of the present application, multiple compressed light fields are output to different display areas 23 of the display system, each display area is provided with a corresponding projection channel, and the corresponding compressed light field is projected into a specified angle space using a directional backlight and a corresponding projection channel to form a sub-observation area.

[0079] S730: stitching the at least two sub-observation areas to form a three-dimensional scene.

[0080] In the implementation manner of the present application, the sub-observation areas formed by each projection channel may be independent of each other and may partially overlap.

[0081] In the implementation manner of the present application, multiple projection channels corresponding to multiple display areas form a projection array, coordinate and control the lighting and display systems, splice the compressed light fields projected by adjacent projection channels, and form a large-viewing angle composite light field corresponding to a three-dimensional scene in an observation area set in space.

[0082] In the flowchart of this embodiment, S710 includes:

[0083] S711: Collect multi-view image information to form a three-dimensional scene.

[0084] In the implementation manner of the present application, the multi-view image information to be formed into a three-dimensional scene can be collected by using a densely arranged virtual or actual camera array. It is also possible to use a number of sparsely arranged virtual or actual cameras for sampling, and then use an algorithm to synthesize the images collected by the dense camera array. The densely arranged virtual or actual camera array facilitates the collection of multi-view images. The sparsely arranged virtual or actual camera array can collect some (multiple) view images, and other view images can be synthesized by an algorithm.

[0085] S712: Group the multi-view images according to the observation sub-areas.

[0086] In the implementation manner of the present application, the perspectives of each group of multi-view images may partially overlap, or the perspectives of each group of multi-view images may be set to be exactly connected to each other.

[0087] S713: compress and decompose each group of multi-view images to form a plurality of compressed light field images.

[0088] In the implementation manner of the present application, the algorithm for compressing and decomposing the multi-view images includes but is not limited to the least squares method, the non-negative tensor decomposition method, the tomography algorithm and machine learning.

Claims

1. A composite light field display system, characterized in that: include: Directional lighting subsystem (1), regional compressed light field display subsystem (2), projection array subsystem (3), field lens (4) and real-time calculation and control subsystem (5), The sub-region compressed light field display subsystem (2) comprises at least two display regions (23), and the at least two display regions (23) are used to display at least two compressed light field images corresponding to at least two different observation angle ranges of the same three-dimensional scene; The directional lighting subsystem (1) is used to emit lighting light, which is modulated by the sub-regional compressed light field display subsystem (2) and then passes through the projection array subsystem (3) to form a composite light field (6) in space. The composite light field (6) forms an observation area (7) in space, and the observation area (7) includes more than two sub-observation areas (71); The real-time calculation and control subsystem (5) is used to calculate compressed light field images corresponding to at least two observation angle ranges, input the compressed light field images into the display area (23) of the sub-regional compressed light field display subsystem (2), and control the directional lighting subsystem (1) and the sub-regional compressed light field display subsystem (2) to coordinate and output a three-dimensional image.

2. The composite light field display system according to claim 1, characterized in that: The projection array subsystem (3) comprises at least two projection channels, and the sub-observation areas (71) of the compressed light fields projected by adjacent projection channels are spliced ​​together; optionally, the display areas (23) are arranged in a one-to-one correspondence with the projection channels.

3. The composite light field display system according to claim 2, characterized in that: The projection channel includes an aberration-corrected lens or lens group.

4. The composite light field display system according to claim 1 or 2, characterized in that: The sub-region compressed light field display subsystem (2) comprises at least two flat display screens.

5. The composite light field display system according to claim 4, characterized in that: At least two of the flat display screens are stacked and spaced apart from each other, or / and, The planes where at least two of the display screens are located form a certain angle. Optionally, the planes where at least two of the display screens are located are vertically arranged.

6. The composite light field display system according to claim 4, characterized in that: At least two of the flat display screens are arranged to be stacked on top of each other through virtual images formed by the directional lighting subsystem (1) and the compressed light field image.

7. The composite light field display system according to claim 2, characterized in that: The arrangement of the at least two display areas (23) comprises one or a combination of two or more of an orthogonal arrangement, a honeycomb arrangement, and a staggered arrangement; optionally, the arrangement of the projection channels is the same as the arrangement of the display areas (23).

8. The composite light field display system according to claim 1, characterized in that: The directional lighting subsystem (1) comprises a light source and a collimating lens, wherein the light source forms collimated light or convergent light through the collimating lens; optionally, the light source comprises an LED light source; Optionally, the light source includes an array light source, which includes a plurality of LED units; the collimating lens includes a collimating lens array, which includes a plurality of lens units; and the projection of the lens unit on the plane where the array light source is located covers at least one of the LED units.

9. A composite light field display method, characterized in that: The composite light field display system according to any one of claims 1 to 8 comprises: Acquire compressed light field information of at least two angle ranges of a three-dimensional scene to be formed; The compressed light field information is input into at least two display areas (23) of a sub-area compressed light field display subsystem (2), and the compressed light field is projected into a three-dimensional space using a directional lighting subsystem (1) backlight and a projection array subsystem (3) to form at least two sub-observation areas; The at least two sub-observation areas are spliced ​​to form a three-dimensional scene.

10. The composite light field display method according to claim 9, characterized in that: The step of obtaining compressed light field information of at least two angle ranges of the three-dimensional scene to be formed comprises: Collect multi-view image information to form a three-dimensional scene: Grouping multi-view images by observation sub-regions; Compress and decompose each group of multi-view images to form multiple compressed light field images; Preferably, collecting multi-view image information to form a three-dimensional scene includes: collecting with a dense virtual or real camera array, or collecting with a sparse virtual or real camera and synthesizing images collected by the dense camera array using an algorithm.

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