An all-solid-state holographic projector

Abstract

The application relates to the field of 3D display, and discloses a full-solid-state holographic projector, which comprises an imaging module and a projection lens group arranged in the holographic projector; the imaging module is used for providing a plurality of non-coincident or mutually parallel equivalent image planes, the distance between any two adjacent equivalent image planes is L (mm), the distance between adjacent pixels on a single equivalent image plane is d (mm), and the following condition is met: L >= 2d; the projection lens group is used for projecting the image plane group formed by the imaging module to form a 3D projection picture with depth information in space. The scheme of introducing a plurality of equivalent image planes realizes the function of real 3D image projection. Since the equivalent image planes are distributed at different depths in space, the projected picture also has depth information, and the holographic screen can provide real 3D display content for users. In the working process of the application, no moving parts are needed, the reliability and picture quality are greatly improved, and the production cost and control difficulty are reduced.

Description

Technical Field

[0001] This invention relates to the field of 3D display, and in particular to an all-solid-state holographic projector. Background Technology

[0002] 3D display technology can provide additional depth information on top of traditional 2D displays, and is therefore considered the next generation of display technology. However, there is currently no truly effective solution for achieving 3D display. Most commercially successful cases are based on pseudo-3D technology using stereoscopic image pairs, which cannot provide users with truly 3D images with depth information. For example, in 3D movies in cinemas, the principle is to use a projector to project two 2D left and right eye image pairs onto the screen. By wearing selective filtering glasses, each eye receives a different image, creating the illusion of seeing a 3D image, but in reality, the projected image is only 2D. Prolonged viewing can also cause eye discomfort.

[0003] Patents with authorization numbers CN106773469B, CN 207114903 U, and CN 206431409 U disclose a solution for achieving true 3D display. Its key component is a stereoscopic display module, which can reproduce realistic 3D images through depth scanning. However, it contains internal moving parts, and the depth scanning process relies on internal motion. While this method can project 3D images, the presence of moving scanning parts compromises system reliability and requires extremely high image refresh rates. This results in a highly complex computational and control system, making stable image display difficult and manufacturing costs extremely high. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide an all-solid-state holographic projector that addresses the shortcomings of the prior art by introducing multiple equivalent projection surfaces to achieve the function of real 3D image projection. At the same time, the invention does not require moving parts during operation, which greatly improves reliability and image quality, while reducing production costs and control difficulty.

[0005] To address the aforementioned technical problems, this invention proposes an all-solid-state holographic projector, comprising an imaging module and a projection lens group disposed inside the holographic projector;

[0006] The imaging module is used to provide multiple non-overlapping or parallel equivalent image planes. The distance between any two adjacent equivalent image planes is L (mm), and the pixel spacing between adjacent pixels on a single equivalent image plane is d (mm), satisfying: L≥2d;

[0007] The projection lens group is used to project multiple equivalent image planes provided by the imaging module and form a 3D image with depth information in space.

[0008] Furthermore, the imaging module includes multiple projection units, an image plane integrated mirror group, and a control chip electrically connected to the multiple projection units;

[0009] The projection unit is used to project images onto the image plane integrated mirror group;

[0010] The image plane integrated mirror group is used to output the projected light from the projection unit to the projection mirror group after optical conversion;

[0011] The control chip is used to control the content of the projected image from the projection unit;

[0012] The projected light from the projection unit undergoes optical conversion by the image plane integration mirror group, which is equivalent to forming multiple non-overlapping or parallel equivalent image planes on one side of the projection mirror group. These equivalent image planes are converted into image planes in space by the optical path of the projection mirror group, and the multiple image planes constitute a 3D image with depth information.

[0013] Furthermore, the image plane integrated mirror group is a cubic prism formed by splicing multiple sub-prisms, and each projection unit corresponds to one side of the image plane integrated mirror group, and the distance between each projection unit and the corresponding side of the image plane integrated mirror group is different.

[0014] Furthermore, the number of projection units is 3, and the image plane integration mirror group is an X-shaped combining prism. The X-shaped combining prism is composed of 4 sub-prisms with cross-sections of isosceles right triangles and square cross-sections. The 3 projection units are respectively located on one side of the three outer surfaces of the X-shaped combining cube prism that are perpendicular to its cross-section, and the distance between the 3 projection units and the corresponding side surfaces of the X-shaped combining cube prism is different. The fourth outer surface of the X-shaped combining cube prism that is perpendicular to its cross-section is the exit surface, which faces the projection mirror group.

[0015] Furthermore, the number of projection units is 5, and the image plane integrated mirror group is a cubic prism composed of several sub-prisms. Each sub-prism is a tetrahedral prism formed by taking two adjacent vertices and the face center and the geometric center of the cube from any face of the cube. The 5 projection units are respectively facing the 5 outer surfaces of the cubic prism mirror, and the distances from the surfaces are different. The sixth face of the cubic prism mirror is the exit face, which faces the projection mirror group.

[0016] Furthermore, each sub-prism assembled into a cubic prism has a semi-transparent, semi-reflective membrane at its joint.

[0017] Furthermore, it also includes an optical path adjustment mirror group disposed between the imaging module and the projection mirror group, used to convert and move the spatial position of the equivalent image plane.

[0018] Furthermore, the optical path adjustment mirror assembly is a mirror assembly containing a convex lens.

[0019] Furthermore, the relative positions between the imaging module and the projection lens group and / or between the projection unit and the image plane integrated lens group are adjustable.

[0020] Furthermore, the imaging module is formed by arranging multiple transparent display screens layer by layer.

[0021] Furthermore, the imaging module includes several semi-transparent and semi-reflective mirrors arranged along a straight line. Each semi-transparent and semi-reflective mirror is provided with a projection unit arranged at an acute angle θ with it, and the distance between each group of projection units and the semi-transparent and semi-reflective mirrors is different.

[0022] Furthermore, the multiple projection units within the imaging module can be partially replaced by photosensitive units to form a dual-function all-solid-state holographic projector that can both project and capture images.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] 1. This invention achieves true 3D image projection by introducing multiple equivalent image surfaces. Since the equivalent image surfaces are distributed at different depths in space, the projected image also carries depth information, which, combined with a holographic screen, can provide users with realistic 3D display content;

[0025] 2. The present invention requires no moving parts during operation, which greatly improves reliability and image quality, while reducing production costs and control difficulty. Moreover, the present invention can also achieve overall movement of the display depth range by adjustment.

[0026] 3. When using this invention, the eyes need to dynamically adjust the depth of focus as if viewing real objects, rather than the fixed depth of focus of ordinary 2D display images. Therefore, it will not cause visual fatigue and helps protect eyesight.

[0027] 4. This invention can simultaneously realize projection and shooting functions, which is convenient for outputting image information and receiving external image information in real time during practical applications. For example, it can recognize user interaction actions and facial expressions while displaying the image. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the internal structure of the present invention.

[0030] Figure 2 This is a schematic diagram of the structure of an embodiment of the present invention with optical path adjustment mirror group 5.

[0031] Figure 3 This is a schematic diagram showing the spatial position of the equivalent image plane 3 after the optical path adjustment mirror group 5 is transformed.

[0032] Figure 4 This is a schematic diagram of the imaging module 1 in Embodiment 1, where the number of projection units 11 is two.

[0033] Figure 5 This is a schematic diagram of the imaging module 1 in Embodiment 2, where the number of projection units 11 is 3.

[0034] Figure 6 These are schematic diagrams of the hexahedral X-shaped prism structures in Examples 1 and 2.

[0035] Figure 7 This is a schematic diagram of the imaging module 1 in embodiment 3, where the number of projection units 11 is 5.

[0036] Figure 8 This is a diagram of the sub-prism structure of the image plane integrated mirror group 12 in Example 3.

[0037] Figure 9 This is a schematic diagram of the imaging module 1 assembly described in Example 4.

[0038] Figure 10 This is a schematic diagram of one combination of the imaging module 1 described in Embodiment 5.

[0039] Figure 11 This is a schematic diagram of another combination of the imaging module 1 described in Embodiment 5, with the following reference numerals:

[0040] Imaging module 1, projection unit 11, image plane integrated mirror group 12, control chip 13, projection mirror group 2, equivalent image plane 3, image plane 4, optical path adjustment mirror group 5, semi-transparent and semi-reflective mirror 6. Detailed Implementation

[0041] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0042] Reference Figures 1 to 11 The present invention provides an all-solid-state holographic projector, including an imaging module 1 and a projection lens group 2 disposed inside the holographic projector;

[0043] The imaging module 1 is used to provide multiple non-overlapping or parallel equivalent image planes 3. The equivalent image plane 3 can be a physical real image plane or a virtual image plane or a real image plane obtained through optical transformation. The distance between any two adjacent equivalent image planes 3 is L (mm), and the pixel spacing between adjacent pixels on a single equivalent image plane 3 is d (mm), satisfying: L≥2d.

[0044] The spacing L between adjacent equivalent image planes 3 determines the resolution of the holographic projector's projected image in the depth direction, while the pixel spacing d on any equivalent image plane 3 determines the horizontal resolution of the image, i.e., the planar resolution capability.

[0045] The human eye's depth resolution is usually much lower than its horizontal resolution, so even if the pixel spacing in the depth direction is large, it will not cause distortion. Therefore, the pixel spacing in the depth direction of the projected image can be set to be larger, so as to project a very realistic 3D image while effectively reducing equipment and process costs.

[0046] To minimize the number of image planes in the depth direction and reduce system complexity, the ratio of pixel spacing in the depth direction to pixel spacing in the horizontal direction, i.e., the ratio of L to d, can be increased as much as possible. The specific effect is as follows:

[0047] When 10d≥L≥2d, the system complexity can be effectively reduced while ensuring the fine image quality in the depth direction.

[0048] When 20d≥L>10d, the system complexity can be further reduced while ensuring that the image quality in the depth direction remains relatively delicate.

[0049] When 30d≥L>20d, the system complexity is moderate, and the image quality in the depth direction is slightly coarser, but it can still display good depth information.

[0050] When 40d≥L>30d, the system complexity is low, but the image quality in the depth direction is coarse, but the depth information display effect can still be achieved.

[0051] When L > 40d, the system complexity can be greatly simplified while providing the necessary depth information;

[0052] When the ratio of the two increases further, the number of image planes in the depth direction can be effectively reduced while still maintaining the visible resolution of the 3D image in the depth direction. The larger the ratio, the worse the ability to express details in the depth direction. In practical applications, adjustments can be made according to the situation.

[0053] The projection lens group 2 is used to project multiple equivalent image planes 3 provided by the imaging module 1 and form a 3D image with depth information in space.

[0054] As a preferred embodiment, the imaging module 1 includes multiple projection units 11, an image plane integrated mirror group 12, and a control chip 13 electrically connected to the multiple projection units 11.

[0055] The projection unit 11 is used to project images onto the image plane integrated mirror group 12. It is equivalent to the imaging structure of a conventional projector in the prior art, including a light source, a liquid crystal chip, etc.

[0056] The image plane integrated mirror group 12 is used to optically convert the projected light from the projection unit 11 to the projection mirror group 2;

[0057] The control chip 13 is used to control the content of the projected image of the projection unit 11;

[0058] The image plane integrated mirror group 12 is preferably a cubic prism formed by splicing multiple sub-prisms. Each projection unit 11 corresponds to one side of the image plane integrated mirror group 12, and the distance between each projection unit 11 and the corresponding side of the image plane integrated mirror group 12 is different.

[0059] In order to optimize the optical path conversion effect of the image plane integrated mirror group 12, a semi-transparent and semi-reflective film is provided at the splicing seam of each sub-prism spliced ​​into a cubic prism.

[0060] The projected light from each projection unit 11 is reflected by the semi-transparent and semi-reflective film at the splicing seams of multiple sub-prisms of the image plane integration mirror group 12. The actual effect is equivalent to the formation of multiple non-overlapping or parallel equivalent image planes 3 on one side of the projection mirror group 2. The equivalent image planes 3 are transformed by the light path of the projection mirror group 2 to form image planes 4 in space. Multiple image planes 4 constitute a 3D image with depth information.

[0061] Imaging module 1 can be formed by arranging multiple transparent display devices layer by layer. For example, multiple transparent OLED (or LCD) display screens can be arranged in parallel with each other. In this way, each layer of transparent display can form its own imaging surface in space, while also being able to penetrate each other, forming 3D image slices with different depths in space to achieve a 3D display effect. Each transparent display device can be equivalently regarded as an equivalent image surface 3.

[0062] When using the image plane integration mirror group 12 to perform optical path transformation on the projected light from the projection unit 11, the distance between the equivalent image plane 3 and the projection mirror group 2 may deviate from the ideal imaging range. Therefore, an optical path adjustment mirror group 5 can be introduced to transform the equivalent image plane 3 into the ideal imaging range of the projection mirror group 2. Thus, an optical path adjustment mirror group 5 is set between the imaging module 1 and the projection mirror group 2 to transform and move the spatial position of the equivalent image plane 3. The simplest form can use a mirror group containing a convex lens, utilizing its optical imaging principles to transform the image plane located on one side of the convex lens to the other side. In practical applications, the imaging quality of a single convex lens is relatively poor. In this case, a series of optical elements for aberration correction, such as concave lenses, can be added. Specific implementation methods can refer to mature solutions in the industry (such as multi-element lens designs for reference cameras), which will not be elaborated here.

[0063] The holographic projector of the present invention also has a focusing function, which is achieved by adjusting the relative position between the imaging module 1 and the projection lens group 2 or between the projection unit 11 and the image plane integrated lens group 12. Alternatively, it can be achieved by adjusting the relative position of the imaging module 1, the projection lens group 2, and the image plane integrated lens group 12. The above-mentioned adjustment function can be achieved by adding some adjustment mechanisms between the imaging module 1 and the projection lens group 2 and / or between the projection unit 11 and the image plane integrated lens group 12. The adjustment mechanism can be various and is not limited here. The specific one can be determined according to the actual situation.

[0064] In actual use, the position of the reference focal plane can be adjusted by zooming. For example, for desktop office scenarios, the reference focal plane (such as the nearest projection plane) can be set between 50cm and 1m away from the user, and for living room audio-visual use, the reference focal plane can be set between 10m and 20m.

[0065] The imaging module 1 can also be configured as follows: it includes several semi-transparent mirrors 6 arranged along a straight line, each semi-transparent mirror 6 is provided with a projection unit 11 arranged at an acute angle θ with it, and the distance between each projection unit 11 and the semi-transparent mirror 6 is different. The angle between the semi-transparent mirror 6 and the projection unit 11 is θ. In specific configuration, the projection unit 11 can be located above the semi-transparent mirror 6 or below the semi-transparent mirror 6, and the range of θ is 30° to 60°, preferably 45°.

[0066] The present invention will be further described in detail below with reference to embodiments:

[0067] Example 1

[0068] There are two projection units 11. The image plane integration mirror group 12 is a hexahedral X-shaped prism, which is composed of four prism mirrors with isosceles right-angled triangular cross-sections spliced ​​together, and the cross-section is square. A semi-transparent and semi-reflective film is provided at the splicing seam inside the X-shaped prism. The two projection units 11 are located on two opposite outer surfaces of the X-shaped prism, perpendicular to its cross-section, and the distance between the two projection units 11 and the corresponding side of the X-shaped prism is different. One of the other two outer surfaces of the X-shaped prism perpendicular to its cross-section is the exit surface, and the exit surface faces the projection mirror group 2. In practice, it is as if two parallel equivalent image planes 3 are arranged behind the exit surface. After the light path transformation of the two parallel equivalent image planes 3 through the projection mirror group 2, two image planes 4 are formed in space, which correspond to the two equivalent image planes 3 respectively. The two image planes 4 constitute a 3D image with depth information.

[0069] Because the equivalent image planes 3 formed by the different surface spacing between the projection unit 11 and the X-link prism do not overlap, this structure is similar to the color-combining prism of a traditional projector, but there are obvious differences. The coating at the seam of the color-combining mirror is a selective reflective film, such as reflecting only red or green light, while the present invention uses a semi-transparent and semi-reflective film, which has no light selectivity. The three colors of the color-combining mirror need to overlap to form a color image, while each image plane of the present invention does not overlap with each other, forming multiple images with depth information.

[0070] Example 2

[0071] There are 3 projection units 11. The image plane integrated mirror group 12 is a hexahedral X-shaped prism composed of 4 prism mirrors with cross-sections of isosceles right triangles and square cross-sections. A semi-transparent and semi-reflective film is provided at the splicing seam inside the X-shaped prism. The 3 projection units 11 are located on one side of the three outer surfaces of the X-shaped prism that are perpendicular to its cross-section. The distance between the 3 projection units 11 and the corresponding side surfaces of the X-shaped prism is different. The fourth outer surface of the X-shaped prism that is perpendicular to its cross-section is the exit surface, and the exit surface faces the projection mirror group 2. In practice, it is as if there are three parallel equivalent image planes 3 arranged behind the output surface. After the light path of the three parallel equivalent image planes 3 is directly converted by the projection lens group 2, three image planes 4 are formed in space, which correspond to the three equivalent image planes 3 respectively. Since the surface distance between the projection unit 11 and the X-axis prism is different, the image planes 4 formed do not overlap, which is equivalent to the three equivalent image planes 3 also not overlapping. The three image planes 4 constitute a 3D image with depth information.

[0072] Example 3

[0073] There are 5 projection units 11. The image plane integration mirror group 12 is a cube prism composed of several sub-prisms. Each sub-prism is a tetrahedral prism formed by taking two adjacent vertices and the face center and the geometric center of the cube from any face of the cube. The internal splicing seams of the cube prism are provided with a semi-transparent and semi-reflective film. The 5 projection units 11 are respectively facing the 5 faces of the cube prism, and the distances to each face are different. The sixth face of the cube prism is the exit face, and the exit face is facing the projection mirror group 2. In practice, it is as if there are five parallel equivalent image planes 3 arranged behind the exit surface. After the light path of the five parallel equivalent image planes 3 is directly converted by the projection lens group 2, five image planes 4 are formed in space, which correspond to the five equivalent image planes 3 respectively. Since the surface distance between the projection unit 11 and the X-axis prism is different, the image planes 4 formed do not overlap, which is equivalent to the five equivalent image planes 3 also not overlapping. The five image planes 4 constitute a 3D image with depth information.

[0074] It should be noted that the form of the image plane integrated mirror group 12 should match the number of projection units 11. When using a larger number (greater than 6) of projection units 11 for projection imaging, the image plane integrated mirror group 12 can be a multifaceted cube structure spliced ​​together from several sub-prisms, and the number of outer surfaces of the multifaceted cube structure is greater than 7.

[0075] The cubic prisms used in the above embodiments 1 to 3 are provided with semi-transparent and semi-reflective films inside and at the joints of each sub-prism. This is only a preferred embodiment and is not a limitation of the present invention. The projection effect of the present invention can be achieved without providing semi-transparent and semi-reflective films at the joints of each sub-prism.

[0076] Example 4

[0077] The imaging module 1 is formed by arranging multiple transparent OLED display screens layer by layer. Each OLED display screen does not block each other and can pass through each other. The image displayed by a single OLED display screen is transformed by the projection lens group 2 and can form its own image surface 4 in space. The image surface 4 is equivalent to a 3D image slice with different depths of field. Each OLED display screen forms an image surface 4 with a different depth of field. Multiple image surfaces 4 constitute a complete 3D image.

[0078] OLED displays can be replaced by other transparent display devices, such as LCD displays.

[0079] The OLED display screens arranged layer by layer in this embodiment are equivalent to multiple non-overlapping or parallel equivalent image planes 3.

[0080] Example 5

[0081] The imaging module 1 includes five semi-transparent mirrors 6 arranged along a straight line. Each semi-transparent mirror 6 is provided with a projection unit 11 arranged at an angle of 45° to it, and the distance between each projection unit 11 and the semi-transparent mirror 6 is different.

[0082] After the projection unit 11 is converted by the corresponding semi-transparent and semi-reflective mirror 6, multiple parallel image surfaces 4 are formed in space. The multiple image surfaces 4 constitute a 3D image with depth information. The actual effect is equivalent to having multiple parallel equivalent image surfaces 3 on one side of the semi-transparent and semi-reflective mirror group. The multiple parallel equivalent image surfaces 3 are directly converted by the light path of the projection mirror group 2 to form a 3D image with depth information in space as described above.

[0083] The transmittance and reflectance of the semi-transparent and semi-reflective mirror 6 do not need to be strictly equal to 50%. The values ​​of transmittance and reflectance can be flexibly adjusted according to actual needs, such as determining the specific values ​​of the two based on the image clarity.

[0084] The imaging principle of this invention is as follows:

[0085] The projected light from multiple projection units 11 is optically transformed by the image plane integration mirror group 12 and the projection mirror group 2, forming multiple parallel image planes 4 corresponding to the projection units 11 in space. The multiple parallel image planes 4 constitute a 3D projection image with depth information. The 3D projection image with depth information is equivalent to the projection mirror group 2 directly optically transforming a set of parallel equivalent image planes 3.

[0086] This invention achieves true 3D image projection by introducing multiple equivalent image planes 3. Since the equivalent image planes are distributed at different depths in space, the projected image also carries depth information, which, combined with a holographic screen, provides users with realistic 3D display content. This invention requires no moving parts during operation, greatly improving its reliability and image quality, while reducing production costs and control complexity.

[0087] Although this invention is intended to provide 3D projection images, by replacing some of the projection units 11 with photosensitive imaging units, a dual-function projection and camera system can also be realized, enabling it to perform both projection and shooting functions, further expanding the system's functionality, such as reading user interaction information while displaying data.

[0088] Multi-level, multi-image-plane imaging modules can also be formed by combining and cascading the various optical path integration methods provided by this invention. For example, the method of 5 image planes in the implementation example can be further integrated into an image plane integration mirror group to form an embodiment with 5*5=25 image planes.

[0089] This invention is preferably applied in on-site holographic display systems (see patent application number 2019108759751). In an on-site holographic display system, in conjunction with a holographic display screen, the divergent 3D images projected by the holographic projector can be reconverged into a converged 3D image that can be directly observed by the human eye. This method not only achieves realistic 3D display but also achieves a completely glasses-free display effect, eliminating the need for special auxiliary equipment. Furthermore, it allows for a certain distance between the holographic projector and the user's eyes (the distance can be set greater than 5cm, for example, a comfortable distance of 10cm to 30cm, or even greater), enabling users to view 3D images very comfortably.

[0090] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. An all-solid-state holographic projector, characterized by: The holographic projector comprises an imaging module (1) and a projection lens group (2) arranged in the holographic projector. The imaging module (1) is used for providing a plurality of non-coincident and mutually parallel equivalent image planes (3), the distance between any two adjacent equivalent image planes (3) is L (mm), and the distance between adjacent pixels on a single equivalent image plane (3) is d (mm), satisfying: ; The projection lens group (2) is used for projecting a plurality of equivalent image planes (3) provided by the imaging module (1) and forming a 3D image screen with depth information in space.

2. A full solid state holographic projector according to claim 1, characterized in that: The imaging module (1) comprises a plurality of projection units (11), an image plane integration lens group (12) and a control chip (13) electrically connected with the plurality of projection units (11). The projection unit (11) is used for projecting a screen to the image plane integration lens group (12). The image plane integration lens group (12) is used for outputting the projection light of the projection unit (11) to the projection lens group (2) after optical conversion. The control chip (13) is used for controlling the projection screen content of the projection unit (11). The projection light of the projection unit (11) is optically converted by the image plane integration lens group (12), and the actual effect is equivalent to forming a plurality of non-coincident and mutually parallel equivalent image planes (3) on the side of the projection lens group (2), the equivalent image planes (3) are converted by the optical path of the projection lens group (2) to form image planes (4) in space, and a plurality of the image planes (4) constitute a 3D image screen with depth information.

3. A full solid state holographic projector according to claim 2, characterized in that: The image plane integration lens group (12) is a cubic prism formed by a plurality of sub-prisms, each of the projection units (11) corresponds to one side of the image plane integration lens group (12), and the distance between each projection unit (11) and the corresponding side of the image plane integration lens group (12) is different.

4. A full solid state holographic projector according to claim 2, characterized in that: The number of the projection units (11) is 3, the image plane integration lens group (12) is an X-shaped combination prism, the X-shaped combination prism is formed by four sub-prisms with an isosceles right triangle cross section and a square cross section, the three projection units (11) are respectively located on the three sides of the X-shaped combination prism which are perpendicular to the cross section, and the distances between the three projection units (11) and the corresponding sides of the X-shaped combination prism are different, and the fourth side of the X-shaped combination prism which is perpendicular to the cross section is an exit surface, and the exit surface faces the projection lens group (2).

5. A full solid state holographic projector according to claim 2, characterized in that: The number of the projection units (11) is 5, the image plane integration lens group (12) is a cubic prism formed by a plurality of sub-prisms, and the sub-prism is a tetrahedral prism formed by two adjacent vertices, a face center and a geometric center of the cubic on any one face of the cubic, and the five projection units (11) respectively face the five outer surfaces of the cubic prism, and the distances between the five projection units (11) and the surfaces are different, and the sixth face of the cubic prism is an exit surface, and the exit surface faces the projection lens group (2).

6. A full solid state holographic projector according to any one of claims 3 to 5, characterized in that: The splicing seam of each sub-prism of the cubic prism is provided with a semi-transparent and semi-reflective film.

7. A full solid state holographic projector according to claim 1 or 2, characterized in that: The holographic projector further comprises an optical path adjustment lens group (5) arranged between the imaging module (1) and the projection lens group (2), which is used for converting and moving the spatial position of the equivalent image plane (3).

8. A full solid state holographic projector according to claim 7, characterized in that: The optical path adjustment lens group (5) is a lens group comprising a convex lens.

9. A full solid state holographic projector according to claim 1, characterized in that: The relative positions between the imaging module (1) and the projection lens group (2) and / or between the projection unit (11) and the image plane integration lens group (12) are adjustable.

10. A full solid state holographic projector according to claim 1, characterized in that: The imaging module (1) is formed by arranging multiple transparent display screens layer by layer.

11. A full solid state holographic projector according to claim 1, characterized in that: The imaging module (1) comprises a plurality of half-mirrors (6) arranged along a straight line, each half-mirror (6) is provided with a projection unit (11) arranged at an acute angle θ, and the distance between each group of projection units (11) and half-mirrors (6) is different.

12. A full solid state holographic projector according to claim 2, characterized in that: The multiple projection units (11) in the imaging module (1) can be partially replaced by light-sensitive imaging units to form a dual-function full-solid-state holographic projector that can project and shoot.

Images