3D display device

Abstract

The utility model relates to the technical field of display, and provides a 3D display device which comprises at least one optical multiplexing module, each optical multiplexing module comprises an optical machine and an optical distribution device, and the optical machine is used for emitting image light; the light distribution device comprises a light separation part and a reflection part, the light separation part is used for receiving the image light and forming first light through part of light in the image light, and the light separation part is further used for reflecting the remaining part of light in the image light; the reflecting part is used for reflecting the image light reflected by the light separating part to form second light; wherein the first light and the second light are used for forming a 3D image. In the 3D display device, one ray machine can form two or more light beams, and the light beams can be used for forming 3D images, so that the number of ray machines required by the 3D display device can be greatly reduced, the weight and the size of the 3D display device can be reduced, the stacking difficulty is reduced, and the complexity and the cost of a system can be reduced.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically to a 3D display device. Background Technology

[0002] With the rapid development of current technology, traditional two-dimensional planar display technology is far from meeting the needs of various industries for depth data and spatial information perception. More and more application areas, such as remote conferencing, smart cabins, and medical imaging, are seeking to reconstruct 3D scenes. Among these, glasses-free 3D display technology can achieve 3D functionality without the need for additional glasses.

[0003] A significant portion of the depth perception information relies on binocular parallax. When observing an object, its image falls at different positions on the retinas of the left and right eyes, and the difference in image quality between the two eyes provides a clue for judging depth. Binocular parallax 3D display utilizes this principle, allowing the left and right eyes to receive different images. This difference in image quality between the left and right eyes creates a virtual, stereoscopic composite image. However, this method suffers from convergence conflict because the focus of the human eye and the perceived position of the 3D object (the position of binocular accommodation) are not on the same plane. For binocular parallax naked-eye 3D display, one projection engine represents one viewpoint. To ensure that the human eye can observe the corresponding viewpoint information within a certain eye box range, a sufficient number of projection engines is required. Furthermore, ensuring smooth viewpoint switching when the human eye moves within the eye box also requires a sufficient number of projection engines. Both of these factors place demands on the number of projectors. Spatial light field 3D display, on the other hand, simulates the diffuse light distribution received by the human eye when observing a real 3D scene. Projection-based spatial light field 3D display is equivalent to the optical interweaving of images from multiple projectors to create a virtual 3D scene. Since the human eye actually receives an image of a specific 3D scene, this method has the advantage of eliminating convergence conflict. However, the number of projectors required for spatial light field 3D display is positively correlated with the resolution of the 3D scene. In summary, both binocular parallax 3D display and spatial light field 3D display place certain demands on the number of projectors. Increasing the number of projectors inevitably leads to disadvantages in terms of system stacking, weight, and size, increasing system complexity, debugging costs, and overall cost. Utility Model Content

[0004] This application provides a 3D display device to at least partially improve the above-mentioned technical problems.

[0005] The embodiments of this application are implemented through the following technical solutions.

[0006] This application provides a 3D display device, including at least one light multiplexing module. Each light multiplexing module includes an optical engine and a light distribution device. The optical engine is used to emit image light. The light distribution device includes a light splitter and a reflector. The light splitter is used to receive the image light and transmit a portion of the image light to form a first ray. The light splitter is also used to reflect the remaining portion of the image light. The reflector is used to reflect the image light reflected by the light splitter to form a second ray. The first ray and the second ray are used to form a 3D image.

[0007] In some embodiments, there are i light distribution devices, which are arranged in an arc shape. Each light distribution device has a light splitter that receives image light or image light reflected by a reflector of an adjacent light distribution device. A portion of the image light passes through to form a first ray, and the remaining portion of the light is reflected. Each reflector is used to reflect the image light reflected by the light splitter of the same light distribution device and enters the light splitter of an adjacent light distribution device. The light reflected by the reflector of the i-th light distribution device forms a second ray, where i ≥ 2. The i first and second rays are used to form a 3D image.

[0008] In some implementations, the optical multiplexing module further includes a switching device configured to periodically switch states to enable the timing generation of each first ray and the second ray.

[0009] In some implementations, the light splitter is used to transmit light in the first band and reflect light in the remaining bands.

[0010] In some embodiments, the light splitter is used to transmit light in a first polarized state and reflect light in a second polarized state, the first polarized light and the second polarized light being orthogonally polarized.

[0011] In some embodiments, switching devices are disposed on the light splitter and the reflector, and each switching device is independently configured to periodically turn on or off. When the switching device is in the off state, it prevents image light from passing through the light splitter or entering the reflector. When the switching device is in the on state, image light can pass through the light splitter or enter the reflector.

[0012] In some implementations, the switching device is a shutter element.

[0013] In some implementations, the switching device is a polarization modulation device, which is disposed in the optical path of the image light emitted from the optomechanical system and is used to periodically switch states to modulate the polarization state of the image light.

[0014] In some embodiments, the image light emitted from the optomechanical system is unpolarized light, and the polarization control device is a liquid crystal device or a rotatable polarizer; or, the image light emitted from the optomechanical system is polarized light, and the polarization control device is an electro-controlled liquid crystal device.

[0015] In some embodiments, the optical engine includes a first optical modulator and a second optical modulator, the first optical modulator being used to output a first image light and the second optical modulator being used to output a second image light, the image light including the first image light and the second image light, the first image light and the second image light being orthogonally polarized.

[0016] In some embodiments, the 3D display device further includes a diffuser and a Fresnel lens, wherein the diffuser receives each first ray and a second ray and diffuses them before passing through the Fresnel lens to form a 3D image.

[0017] In some implementations, each first ray and second ray interweaves in space to form a 3D image.

[0018] The 3D display device provided in this application embodiment uses a light distribution device to separate a portion of the image light that passes through the light splitter as a first light beam, and then uses a reflector to reflect a portion of the light that does not pass through the light splitter as a second light beam. The first and second light beams are used to form a 3D image. One optical engine can form two or more light beams, which can be used to form a 3D image. Therefore, the number of optical engines required for this 3D display device can be greatly reduced, the weight and volume of the 3D display device can be reduced, the stacking difficulty is reduced, and the complexity and cost of the system can be reduced. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a 3D display device provided in an embodiment of this application.

[0021] Figure 2 This is a schematic diagram of another 3D display device provided in the embodiments of this application.

[0022] Figure 3 This is a schematic diagram of another 3D display device provided in the embodiments of this application.

[0023] Figure 4 This is a schematic diagram of another 3D display device provided in the embodiments of this application. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] See Figure 1 This embodiment provides a 3D display device 10, including at least one light multiplexing module 20. Each light multiplexing module 20 includes an optical engine 40 and a light distribution device 30. The optical engine 40 is used to emit image light, and the light distribution device 30 receives the image light and separates the image light to form at least two beams of light.

[0026] Specifically, in this embodiment, the light distribution device 30 includes a light splitter 31 and a reflector 32. The light splitter 31 receives the image light emitted from the optical engine 40 and transmits a portion of the image light to form a first ray. The light splitter 31 can be positioned corresponding to the direction of the emitted light from the optical engine 40. The light splitter 31 also reflects the remaining portion of the image light. The light reflected by the light splitter 31 propagates towards the reflector 32. The reflector 32 reflects the image light reflected by the light splitter 31 to form a second ray. The first and second rays propagate in a non-parallel manner, allowing them to converge during propagation.

[0027] In this embodiment, the light splitter 31 can be a semi-transparent, semi-reflective film. The light splitter 31 can transmit light in the first wavelength band and reflect light in other wavelength bands. For example, the first wavelength band can be the red light band, in which case the light splitter 31 can transmit red light and reflect blue light and other light. Thus, when image light is incident on the light splitter 31, the red light in the image light can pass through, while blue light and other light are reflected to the reflector 32. The reflector 32 then reflects the light reflected by the light splitter 31 to form a second light beam. It is understood that in some other embodiments, the first wavelength band can also be the blue light band or other wavelength bands; this embodiment does not limit this.

[0028] There can be one or more optical multiplexing modules 20, where "multiple" refers to two or more. When there are multiple optical multiplexing modules 20, they are arranged sequentially in an arc shape. For example... Figure 1The optical engines 40 of the multiple optical multiplexing modules 20 are arranged in an arc on the same circumference, as are the optical splitters 31 and reflectors 32 of the multiple optical multiplexing modules 20. When the number of optical multiplexing modules 20 is increased, more first and second rays are formed, effectively reducing the number of virtual optical engines 40 and further improving the clarity of the 3D display.

[0029] Each optical engine 40 generates a first ray and a second ray, each corresponding to a viewpoint, and each viewpoint needs to correspond to a different image. During the propagation of the image light, for the same optical engine 40, the first ray and the second ray are generated simultaneously, and the image content corresponding to the first ray and the second ray is the same. However, the viewpoint corresponding to the first ray will receive the image from the viewpoint corresponding to the second ray next door, and the viewpoint corresponding to the second ray will receive the image from the viewpoint corresponding to the first ray next door, which may cause crosstalk.

[0030] In some implementations, the image light emitted from the optical engine 40 can be generated sequentially. This allows the first and second rays generated by each optical engine 40 to be generated in a sequential manner, thus avoiding image light crosstalk between multiple optical multiplexing modules 20. That is, if only the first ray or the second ray is generated at the same time, the viewpoint corresponding to the first ray will not receive the image from the viewpoint corresponding to the second ray next to it, and the viewpoint corresponding to the second ray will not receive the image from the viewpoint corresponding to the first ray next to it, thus preventing crosstalk.

[0031] In another embodiment, the optical multiplexing module 20 may further include a switching device 70 configured to periodically switch states to generate a first ray and a second ray in a timing sequence for each optomechanical unit 40.

[0032] In this embodiment, switching devices 70 are disposed on the light splitter 31 and the reflector 32. Each switching device 70 has an on state and an off state, and each switching device 70 is independently configured to periodically turn on or off. When the switching device 70 is in the off state, the switching device 70 disposed on the light splitter 31 can prevent image light from passing through the light splitter 31, and the switching device 70 disposed on the reflector 32 can prevent image light from entering the reflector 32, thus preventing it from being reflected by the reflector 32. When the switching device 70 is in the on state, image light can pass through the light splitter 31, and simultaneously, image light can enter the reflector 32 and be reflected by the reflector 32. That is, when the switching device 70 is in the on state, the switching device 70 does not affect the propagation of image light.

[0033] In a more specific implementation, the switching device 70 can be a shutter element, which can be an electromechanical shutter or a shutter structure formed of electrochromic material; this embodiment does not limit this. Furthermore, the shutter element can be mounted on the light separator 31 or the reflector 32, or it can be integrally formed with the light separator 31 or the reflector 32; this embodiment does not limit this either.

[0034] In this embodiment, the 3D display device 10 further includes a diffuser 50 and a Fresnel lens 60. The diffuser 50 receives each first ray and the second ray, diffuses them, and then transmits them through the Fresnel lens 60 to form a 3D image. In other embodiments, such as... Figure 2 As shown, the diffuser 50 and Fresnel lens 60 may not be provided, and each first ray and second ray may directly interweave in space to form a 3D image. This embodiment does not limit this.

[0035] by Figure 1 The working principle of the light distribution device 30 will be described using the illustrated embodiment as an example:

[0036] At time t1, image light emitted from the optical engine 40 of the optical multiplexing device is incident on the optical splitter 31. At this time, the switching device 70 located on the optical splitter 31 is turned on, and the switching device 70 located on the reflector 32 is turned off. The image light can pass through the optical splitter 31 to form a first ray, but the remaining portion of the image light reflected by the optical splitter 31 cannot enter the reflector 32 and cannot be reflected to form a second ray. At time t2, after time t1, image light emitted from the optical engine 40 is incident on the optical splitter 31. At this time, the switching device 70 located on the optical splitter 31 is turned off, and the switching device 70 located on the reflector 32 is turned on. The image light cannot pass through the optical splitter 31 to form a first ray, but the remaining portion of the image light reflected by the optical splitter 31 can enter the reflector 32 and be reflected to form a second ray. By periodically turning the switching devices 70 on and off in the optical splitter 31 and the reflector 32, the first and second rays can be generated in a sequential manner, thus preventing crosstalk in the subsequently formed 3D image.

[0037] The 3D display device 10 provided in this embodiment uses a light distribution device 30 to separate a portion of the image light as a first ray using a light splitter 31, and then uses a reflector 32 to reflect a portion of the light that has not passed through the light splitter 31 as a second ray. The first ray and the second ray are used to form a 3D image. One optical engine 40 can form two or more beams of light, which can be used to form a 3D image. Therefore, the number of optical engines 40 required for the 3D display device 10 can be greatly reduced, the weight and volume of the 3D display device 10 can be reduced, the stacking difficulty is reduced, and the complexity and cost of the system can be reduced.

[0038] Example 2

[0039] Figure 3 Another embodiment of the 3D display device 10 is shown, which is related to Figure 1 The difference in the 3D display device 10 shown is that the number of light distribution devices 30 in each light multiplexing device is different. For the same parts, please refer to the content of the foregoing embodiments, which will not be repeated here.

[0040] Figure 3 In the illustrated embodiment, there can be i light distribution devices 30, where i ≥ 2. For example, i can be 3, 4, etc. In this embodiment, i is 3. The i light distribution devices 30 are arranged in an arc shape. The optical engines 40 of multiple optical multiplexing modules 20 are arranged in an arc shape on the same circumference. The light splitters 31 of multiple light distribution devices 30 of the same optical multiplexing module 20 are arranged in an arc shape on the same circumference. The reflectors 32 of multiple light distribution devices 30 of the same optical multiplexing module 20 are arranged in an arc shape on the same circumference. When the number of light distribution devices 30 is greater, the image light emitted from the same optical engine 40 will form more first rays and second rays, thus effectively reducing the number of virtual optical engines 40 and further improving the clarity of the 3D display.

[0041] Each light distribution device 30's light splitter 31 receives image light or image light reflected by the reflector 32 of an adjacent light distribution device 30. A portion of the image light passes through to form a first ray, and the remaining portion of the light is reflected. Each reflector 32 is used to reflect the image light reflected by the light splitter 31 of the same light distribution device 30 and enters the light splitter 31 of an adjacent light distribution device 30. The light reflected by the reflector 32 of the i-th light distribution device 30 forms a second ray. That is, the light splitter 31 of the first light distribution device 30 is used to receive the image light emitted from the optical engine 40, transmit a portion of the image light, and reflect the remaining light to the reflector 32 of the first light distribution device 30. The reflector 32 of the first light distribution device 30 reflects the image light to the light splitter 31 of the second light distribution device 30. The light splitter 31 transmits a portion of the image light and reflects the remaining light to the reflector 32 of the second light distribution device 30, and so on. The reflector 32 of the i-th light distribution device 30 reflects the image light to form a second ray. The i first rays and the second rays are used to form a 3D image.

[0042] As an example only, i can be 3. The light splitter 31 of the first light distribution device 30 can transmit 25% of the image light, the light splitter 31 of the second light distribution device 30 can transmit 30% of the image light, and the light splitter 31 of the third light distribution device 30 can transmit 50% of the image light. The reflector 32 of the third light distribution device 30 reflects the remaining light, thus forming three first rays and one second ray. The light energy of the first ray and the second ray is 25% of the light energy of the image light emitted from the optical engine 40. The advantage of this implementation is that it can further reduce the number of optical engines 40, and reduce the size and weight of the entire 3D display device 10.

[0043] It is understood that the 3D display device in this embodiment can also be applied to 3D display devices based on the spatial light field 3D principle.

[0044] The 3D display device 10 provided in this embodiment uses multiple light distribution devices 30. A portion of the image light that passes through the light is separated by a light splitter 31 as a first light beam, and a portion of the light that does not pass through the light splitter 31 is reflected by a reflector 32 as a second light beam. The first and second light beams are used to form a 3D image. One optical engine 40 can form two or more light beams, which can be used to form a 3D image. Therefore, the number of optical engines 40 required for the 3D display device 10 can be greatly reduced, and the weight and volume of the 3D display device 10 can be reduced. The stacking difficulty is also reduced, and the complexity and cost of the system can be reduced.

[0045] Example 3

[0046] This embodiment provides another 3D display device 10, which differs from the 3D display device 10 in the preceding embodiment in that the working principle of the light splitter 31 in each light multiplexing device is different. For the same parts, please refer to the content of the preceding embodiment. The following only discusses the different parts.

[0047] In this embodiment, the light separator 31 can be a polarizer capable of transmitting first polarized light and reflecting second polarized light, wherein the first polarized light and the second polarized light are orthogonally polarized. The first polarized light can be S-polarized light, and the second polarized light can be P-polarized light, or vice versa. The first polarized light can also be left-handed circularly polarized light, and the second polarized light can be right-handed circularly polarized light, or vice versa. This embodiment does not limit the specific polarization.

[0048] In this embodiment, the image light emitted from the optomechanical system 40 is unpolarized light. The optical multiplexing module 20 also includes a switching device 70, which is a polarization modulation device. The polarization modulation device is disposed in the optical path of the image light emitted from the optomechanical system 40 and is used to periodically switch states to modulate the polarization state of the image light. The polarization modulation device can include at least two states. In one state, the polarization modulation device can transmit light of the first polarization state and reflect light of the second polarization state; in another state, the polarization modulation device can transmit light of the second polarization state and reflect light of the first polarization state. For example, the polarization modulation device can be a mechanically rotating polarizer. The polarizer includes a first region and a second region. The first region can transmit light of the first polarization state and reflect light of the second polarization state, and the second region can transmit light of the second polarization state and reflect light of the first polarization state. The polarizer can rotate, and during the rotation, the first region or the second region is periodically aligned with the optical path of the image light. When the first region corresponds to the optical path of the image light, the first polarized light can pass through the light splitter 31 of the light distribution device 30. When the second region corresponds to the optical path of the image light, the second polarized light can pass through the light splitter 31 of the light distribution device 30.

[0049] Meanwhile, since the light splitter 31 can transmit light of the first polarization state and reflect light of the second polarization state, when the light of the first polarization state enters the light splitter 31, a first ray is formed, and no second ray is generated at this time; when the light of the second polarization state enters the light splitter 31, a second ray is formed, and no first ray is generated at this time. In this way, the first ray and the second ray are generated in a time sequence.

[0050] In some other embodiments, the image light emitted from the optomechanical system 40 is polarized light, and the polarization control device can also be an electro-liquid crystal device, which functions similarly to a half-wave plate. In this case, the electro-liquid crystal device has two states. In one state, the electro-liquid crystal element can directly transmit the image light, and in the other state, the electro-liquid crystal device can convert the polarization state of the image light, such as converting the first polarization state light into the second polarization state light.

[0051] In other embodiments, the switching device 70 may also be the same shutter element as the switching device 70 in Embodiment 1. For specific configuration methods, please refer to the relevant content of Embodiment 1, which will not be repeated here.

[0052] It is understood that the 3D display device in this embodiment can also be applied to 3D display devices based on the spatial light field 3D principle.

[0053] The 3D display device 10 provided in this embodiment uses a light distribution device 30 to separate a portion of the image light transmitted through the light splitter 31 as a first light beam, and a reflector 32 to reflect a portion of the light that did not transmit through the light splitter 31 as a second light beam. The first and second light beams are used to form a 3D image. One optical engine 40 can form two or more light beams, which can be used to form a 3D image. Therefore, the number of optical engines 40 required for the 3D display device 10 can be greatly reduced, the weight and volume of the 3D display device 10 can be reduced, the stacking difficulty is reduced, and the complexity and cost of the system can be reduced.

[0054] Example 4

[0055] See Figure 4 This embodiment provides a 3D display device 10. The difference between this embodiment and embodiment 3 is that the form of the optical engine 40 is different. For the same parts, please refer to the content of embodiment 3, which will not be repeated here.

[0056] In this embodiment, the optical engine 40 includes a first optical modulator 41 and a second optical modulator 42. The first optical modulator 41 is used to output a first image light, and the second optical modulator 42 is used to output a second image light. The image light includes the first image light and the second image light, and the polarizations of the first image light and the second image light are orthogonal. Both the first optical modulator 41 and the second optical modulator 42 can be Lcos display panels or LCD display panels, etc., and this embodiment does not limit them.

[0057] In some embodiments, the first optical modulator 41 and the second optical modulator 42 can generate the first image light and the second image light in a time sequence, so that the first light and the second light can be generated in a time sequence without the need to set up the switching device 70.

[0058] In some other embodiments, the first light modulator 41 and the second light modulator 42 can simultaneously generate the first image light and the second image light. In this case, a switching device 70 can also be set, and the setting method is the same as in embodiment 3, which will not be described again here.

[0059] In this embodiment, in order to improve light utilization, the first light modulator 41 and the second light modulator 42 can use the same light source. Specifically, the light source emits unpolarized light, and a polarizing beam splitter 43 (PBS) is provided between the light source, the first light modulator 41 and the second light modulator 42. The light emitted from the light source is split by the PBS. The first polarized light is guided to the first light modulator 41 and modulated into the first image light; the second polarized light is guided to the second light modulator 42 and modulated into the second image light.

[0060] It is understood that the 3D display device in this embodiment can also be applied to 3D display devices based on the spatial light field 3D principle.

[0061] The 3D display device 10 provided in this embodiment uses a light distribution device 30 to separate a portion of the image light that passes through the light splitter 31 as a first ray, and a reflector 32 to reflect a portion of the light that does not pass through the light splitter 31 as a second ray. The first ray and the second ray are used to form a 3D image. Since the first light modulator 41 and the second light modulator 42 in the optical engine 40 can emit two types of orthogonally polarized image light, it is equivalent to replicating the optical engine 40. Therefore, the number of optical engines 40 required for the 3D display device 10 can be greatly reduced, the weight and volume of the 3D display device 10 can be reduced, the stacking difficulty is reduced, and the complexity and cost of the system can be reduced.

[0062] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A 3D display device, characterized in that, Includes at least one optical multiplexing module, each of the optical multiplexing modules comprising: Optical engine, which is used to emit image light; A light distribution device includes a light splitter and a reflector. The light splitter receives the image light and transmits a portion of the image light to form a first ray. The light splitter also reflects the remaining portion of the image light. The reflector reflects the image light reflected by the light splitter to form a second ray. The first ray and the second ray are used to form a 3D image.

2. The 3D display device according to claim 1, characterized in that, The light distribution device comprises i units, which are arranged in an arc shape. The light splitter of each light distribution device receives the image light or the image light reflected by the reflector of an adjacent light distribution device. A portion of the light rays in the image light are transmitted to form the first light ray, and the remaining portion of the light rays are reflected. Each reflector is used to reflect the image light reflected by the light splitter of the same light distribution device, which then enters the light splitter of an adjacent light distribution device. The light rays reflected by the reflector of the i-th light distribution device form the second light ray, where i ≥ 2. The i first light rays and the i second light rays are used to form a 3D image.

3. The 3D display device according to claim 1, characterized in that, The optical multiplexing module also includes a switching device configured to periodically switch states to enable the timing generation of each of the first and second rays.

4. The 3D display device according to claim 3, characterized in that, The light splitter is used to transmit light in the first band and reflect light in the remaining bands.

5. The 3D display device according to claim 3, characterized in that, The light splitter is used to transmit light in a first polarization state and reflect light in a second polarization state, wherein the first polarization state light and the second polarization state light are orthogonally polarized.

6. The 3D display device according to claim 4 or 5, characterized in that, The switching devices are disposed on the light separator and the reflector. Each switching device is independently configured to periodically turn on or off. When the switching device is in the off state, it prevents the image light from passing through the light separator or entering the reflector. When the switching device is in the on state, the image light can pass through the light separator or enter the reflector.

7. The 3D display device according to claim 6, characterized in that, The switching device is a shutter element.

8. The 3D display device according to claim 5, characterized in that, The switching device is a polarization modulation device, which is disposed in the optical path of the image light emitted from the optomechanical system and is used to periodically switch states to modulate the polarization state of the image light.

9. The 3D display device according to claim 8, characterized in that, The image light emitted by the optomechanism is unpolarized light, and the polarization control device is a liquid crystal device or a rotatable polarizer; or, the image light emitted by the optomechanism is polarized light, and the polarization control device is an electro-controlled liquid crystal device.

10. The 3D display device according to claim 1, characterized in that, The optical engine includes a first optical modulator and a second optical modulator. The first optical modulator is used to output a first image light, and the second optical modulator is used to output a second image light. The image light includes the first image light and the second image light, and the first image light and the second image light are orthogonally polarized.

11. The 3D display device according to any one of claims 1-5 and 8-10, characterized in that, The 3D display device further includes a diffuser and a Fresnel lens. The diffuser receives each of the first light rays and the second light rays and diffuses them before passing through the Fresnel lens to form a 3D image.

12. The 3D display device according to any one of claims 1-5 and 8-10, characterized in that, Each of the first ray and the second ray interweaves in space to form a 3D image.

Images