A laser projection system for 3D projection
By using a polarized laser light source and a rotating wheel, the time-synchronous conversion between P-beams and S-beams was achieved, solving the problem of high cost in existing 3D laser projection systems and realizing a highly efficient 3D projection effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN SDMC TECH CO LTD
- Filing Date
- 2025-09-02
- Publication Date
- 2026-06-16
AI Technical Summary
Existing 3D laser projection systems require two sets of spatial light modulators to modulate parallel and vertically polarized light respectively, resulting in high implementation costs.
Using a laser source with polarization state, combined with a first beam direction adjustment component and a rotating wheel, and through the alternating setting of a wavelength plate and a diffuser, the timing synchronization and polarization state synchronization of P-beam and S-beam are achieved, and a single spatial light modulator is used to alternately display P-beam and S-beam images.
It reduces hardware costs while maintaining light source brightness, achieving a highly efficient 3D projection effect.
Smart Images
Figure CN224366299U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of laser projection equipment technology, and specifically relates to a laser projection system for 3D projection. Background Technology
[0002] Common 3D projection systems are generally based on polarized light technology. After the 3D projection system projects two images with horizontal parallax, the audience wears matching polarized glasses. The left and right lenses filter the image in a specific polarization direction, ensuring that each eye only receives the corresponding image. The human brain generates a stereoscopic effect by fusing these two parallax images, thus realizing 3D viewing.
[0003] Laser projection systems offer higher light efficiency compared to LCD projection systems. In existing 3D laser projection systems, a laser source emits a beam of light, and a polarization beam splitting system separates the incident beam into parallel-polarized and perpendicular-polarized light. These two beams carry the same color information but independent image data. Subsequently, two sets of spatial light modulators receive left and right eye image signals from the system controller and independently modulate the corresponding polarized beams, encoding them into patterns for the left and right eye perspectives. The beams are then projected onto the screen through lenses, and finally, the viewer receives the image while wearing matching polarized glasses. This laser projection system achieves simple and efficient 3D laser projection, but it requires two sets of spatial light modulators to modulate the parallel and perpendicular-polarized light separately, resulting in higher costs. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the high cost of implementing 3D laser projection systems in the prior art, thereby providing a laser projection system for 3D projection.
[0005] A laser projection system for 3D projection includes a laser light source, a first beam direction adjustment component, a second beam direction adjustment component, a rotating wheel, a compound eye, a total reflection prism, a digital micromirror device, and a lens;
[0006] The first beam direction adjustment component is located at the front end of the laser source and is used to separate the laser into parallel polarized light and vertically polarized light; the second beam direction adjustment component is used to adjust the direction of the vertically polarized light to be parallel to the parallel polarized light; the rotating wheel is located at the front end of the first beam direction adjustment component and the second beam direction adjustment component, and the rotating wheel includes a wavelength plate and a diffuser, which are alternately arranged to form a ring; the compound eye is located at the front end of the rotating wheel; the total internal reflection prism is located at the front end of the rotating wheel; the digital micromirror device is used to modulate the beam reflected by the total internal reflection prism and output it to the total internal reflection prism; the lens is located at the front end of the total internal reflection prism.
[0007] Furthermore, it also includes a laser speckle suppressor, which is disposed at the front end of the laser source.
[0008] Furthermore, it also includes a light homogenizing device, which is disposed between the laser source and the laser speckle suppressor.
[0009] Furthermore, the first beam direction adjustment component includes a beam splitter and a set of collecting lens assemblies. The collecting lens assemblies are disposed at the front end of the beam splitter and include a first lens and a second lens.
[0010] Furthermore, the second beam direction adjustment component includes a first reflector and a set of collecting lens assemblies. The collecting lens assemblies are disposed at the front end of the first reflector and include a first lens and a second lens.
[0011] Furthermore, it also includes a third beam direction adjustment component, which includes a second reflector and a third lens, with the third lens disposed at the front end of the second reflector; the third beam direction adjustment component is disposed between the rotating wheel and the compound eye, and is used to adjust the direction of the beam formed by the beam emitted from the second beam direction adjustment component passing through the rotating wheel.
[0012] Furthermore, it also includes a fourth beam direction adjustment component, which includes a third reflecting mirror and a fourth lens, with the fourth lens disposed at the front end of the third reflecting mirror; the fourth beam direction adjustment component is disposed between the rotating wheel and the compound eye, and is used to adjust the direction of the beam formed by the parallel polarized light emitted from the first beam direction adjustment component passing through the rotating wheel.
[0013] Furthermore, it also includes a fifth beam direction adjustment component, which includes a fourth reflecting mirror, a fifth lens, and a sixth lens. The sixth lens is disposed at the front end of the fifth lens, and the fifth lens is disposed at the front end of the fourth reflecting mirror. The fifth beam direction adjustment component is disposed between the compound eye and the total reflection prism, and is used to adjust the emitted beam of the compound eye to the direction of the total reflection prism.
[0014] Furthermore, it also includes a protective glass disposed between the digital micromirror device and the total internal reflection prism.
[0015] Furthermore, the lens includes four convex lenses arranged sequentially, so that the light beam incident on the lens passes through the four convex lenses.
[0016] Furthermore, the rotating wheel includes five wavelength plates and five diffuser plates, the wavelength plates and diffuser plates being fan-shaped, and the wavelength plates and diffuser plates being alternately arranged to form a ring.
[0017] Beneficial Effects: This utility model discloses a laser projection system for 3D projection, including a laser light source, a first beam direction adjustment component, a second beam direction adjustment component, a rotating wheel, compound eyes, a total internal reflection prism, a digital micromirror device, and a lens. By using a laser light source with its own polarization state, the first beam direction adjustment component separates P-beams and S-beams. The rotating wheel, with a wavelength plate attached, achieves timing synchronization and polarization state synchronization of the P-beams and S-beams. After timing synchronization with the DLP display chip, P-beam and S-beam images are projected alternately, thus realizing polarized 3D image display. Wearing polarized glasses achieves a 3D viewing effect. This utility model uses a laser light source to improve the color gamut of 3D projection. Simultaneously, by integrating a diffuser and wavelength plate on the rotating wheel, the device size is reduced. Furthermore, only a single spatial light modulator is needed to alternately display P-beam and S-beam images, effectively reducing hardware costs without sacrificing light source brightness. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this application 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 of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0020] Figure 2 This is a schematic diagram of the rotating wheel structure of this utility model;
[0021] Figure 3 This is a schematic diagram of the projection imaging timing of this utility model.
[0022] Explanation of reference numerals in the attached figures: 1. Laser source; 2. Laser speckle suppressor; 3. Beam homogenizer; 4. Beam splitter; 5. First reflector; 6. Collecting lens assembly; 601. First lens; 602. Second lens; 7. Second reflector; 8. Third lens; 9. Third reflector; 10. Fourth lens; 11. Rotating wheel; 1101. Wavelength plate; 1102. Diffuser; 12. Compound eye; 13. Fourth reflector; 14. Fifth lens; 15. Sixth lens; 16. TIR total internal reflection prism; 17. Protective glass; 18. Digital micromirror device; 19. Lens. Detailed Implementation
[0023] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0024] In the description of this application, it should be understood that the terms "front," "rear," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0026] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.
[0027] Reference Figure 1 As shown, this utility model provides a laser projection system for 3D projection, including a laser light source, a first beam direction adjustment component, a second beam direction adjustment component, a rotating wheel, a compound eye, a total reflection prism, a digital micromirror device, and a lens.
[0028] In this embodiment, the laser light source is an RGB three-in-one laser light source.
[0029] A laser speckle reducer (LSR) is disposed at the front end of the laser source to suppress speckle.
[0030] The light homogenizing device is disposed between the laser source and the laser speckle suppressor.
[0031] The first beam direction adjustment assembly is located at the front end of the laser source and is used to separate the laser beam into parallel polarized light (P-beam) and vertically polarized light (S-beam). The first beam direction adjustment assembly includes a beam splitter and a set of collecting lens assemblies, which include a first lens and a second lens. The beam splitter separates the beam into parallel polarized light and vertically polarized light, and the collecting lens assembly of the first beam direction adjustment assembly is used to focus the parallel polarized light onto the rotating wheel. The collecting lens assembly is disposed at the front end of the beam splitter, and the parallel polarized light emitted from the first beam direction adjustment assembly is perpendicularly incident on the rotating wheel.
[0032] The second beam direction adjustment assembly is used to adjust the direction of vertically polarized light to be parallel to the parallelly polarized light. The second beam direction adjustment assembly includes a first reflecting mirror and a set of collecting lens assemblies. The collecting lens assemblies are disposed at the front end of the first reflecting mirror and include a first lens and a second lens. The first reflecting mirror reflects and adjusts the direction of the vertically polarized light to be parallel to the parallelly polarized light, and it is incident perpendicularly onto the rotating wheel. The collecting lens assembly of the second beam direction adjustment assembly is used to focus the vertically polarized light.
[0033] In a preferred embodiment, the collecting lens assembly includes a first lens and a second lens, both of which are convex lenses, one of which is an aspherical lens, thereby achieving a better focusing effect. In other embodiments of this invention, the collecting lens assembly is not limited to using two lenses.
[0034] The rotating wheel is located at the front end of the first beam direction adjustment component and the second beam direction adjustment component. The rotating wheel includes wavelength plates and diffusers, which are alternately arranged to form a ring. In this embodiment, the rotating wheel includes five wavelength plates and five diffusers, which are fan-shaped and alternately arranged to form a circular ring. Specifically, the rotating wheel is driven to rotate by a high-speed stepper motor, causing the alternating ring structure of wavelength plates and diffusers to rotate around its center. The wavelength plates are one or a combination of half-wave plates and quarter-wave plates, and the diffusers are coated with an AR film. A diffusion film is attached to the rear surface of the diffuser in the beam emission direction, thereby diluting the light spread, homogenizing the light, and eliminating speckle. The diffusion angle of the diffuser is within 20°, reducing the size of the front-end device.
[0035] In this embodiment, a diffuser plate is also attached to the front end of the wavelength plate, so that the light beam passes through the wavelength plate first and then diffuses through the diffuser plate.
[0036] The rotating wheel is configured such that when one of the parallel-polarized light and the vertically polarized light passes through the wavelength plate, the other passes through the diffuser.
[0037] The third beam direction adjustment component includes a second reflector and a third lens, with the third lens disposed at the front end of the second reflector; the third beam direction adjustment component is disposed between the rotating wheel and the compound eye, and is used to adjust the direction of the beam formed by the beam emitted from the second beam direction adjustment component after passing through the rotating wheel.
[0038] The fourth beam direction adjustment component includes a third reflecting mirror and a fourth lens, the fourth lens being disposed at the front end of the third reflecting mirror; the fourth beam direction adjustment component is disposed between the rotating wheel and the compound eye, and is used to adjust the direction of the beam formed by the parallel polarized light emitted from the first beam direction adjustment component passing through the rotating wheel.
[0039] The compound eye is located at the front end of the rotating wheel and is used to achieve uniform light distribution of parallel polarized light and vertical polarized light.
[0040] The total internal reflection prism is located at the front end of the rotating wheel.
[0041] A fifth beam direction adjustment component, comprising a fourth reflecting mirror, a fifth lens, and a sixth lens, wherein the sixth lens is disposed at the front end of the fifth lens, and the fifth lens is disposed at the front end of the fourth reflecting mirror; the fifth beam direction adjustment component is disposed between the compound eye and the total internal reflection prism, and is used to adjust the emitted beam from the compound eye to the direction of the total internal reflection prism.
[0042] The digital micromirror device (DMD) is used to modulate the beam reflected by the total internal reflection prism and output it to the total internal reflection prism.
[0043] A protective glass is disposed between the digital micromirror device and the total internal reflection prism. In this embodiment, the protective glass is fixed to the front end of the digital micromirror device, forming an integral structure with the digital micromirror device and being part of the digital micromirror device.
[0044] The lens is located at the front end of the total internal reflection prism. The lens includes four convex lenses arranged sequentially, so that the light beam incident on the lens passes through the four convex lenses.
[0045] Working principle: The emitted beam from the laser source passes sequentially through a homogenizing device and a laser speckle suppressor. After passing through the first beam direction adjustment component, it is separated into parallel polarized light and vertical polarized light. The parallel polarized light passes sequentially through a rotating wheel and a fourth beam direction adjustment component before entering the compound eye. The vertical polarized light passes sequentially through a second beam direction adjustment component, a rotating wheel, and a third beam direction adjustment component before entering the compound eye. The emitted beam after homogenization by the compound eye passes through a fifth beam direction adjustment component and enters the total internal reflection prism. After total internal reflection, it passes through the protective glass on the digital micromirror device and is incident on the digital micromirror device. The light is modulated by the digital micromirror device and then passes through the total internal reflection prism before entering the lens to achieve 3D projection imaging.
[0046] When parallel-polarized light incident on the rotating wheel passes through the wavelength plate, it becomes vertically polarized light. This vertically polarized light then passes through the diffuser without polarization conversion. Consequently, the vertically polarized light is modulated by a digital micromirror device and projected to form a vertically polarized light image. Conversely, when vertically polarized light incident on the rotating wheel passes through the wavelength plate, it becomes parallel-polarized light. This parallel-polarized light then passes through the diffuser without polarization conversion. Consequently, the parallel-polarized light is modulated by a digital micromirror device and projected to form a parallel-polarized light image.
[0047] The laser source emits light sequentially according to a duty cycle, while a rotating wheel rotates continuously. Synchronization between the laser, the rotating wheel, and the digital micromirror device alternately generates parallel-polarized light images and vertically polarized light images, such as... Figure 3 As shown, this imaging method does not sacrifice the brightness of the light source. By superimposing alternating parallel polarized light images and vertical polarized light images, a 3D viewing effect can be achieved by wearing 3D polarized glasses.
[0048] This embodiment provides a laser projection system for 3D projection. Using a laser light source with its own polarization state, a first beam direction adjustment component separates P-beams and S-beams. A rotating wheel with a wavelength plate is then used to synchronize the timing and polarization state of the P-beams and S-beams. After synchronization with the DLP display chip, P-beam and S-beam images are projected alternately, thus achieving polarized 3D image display. Wearing polarized glasses provides a 3D viewing effect. This invention uses a laser light source to improve the color gamut of 3D projection. Simultaneously, by integrating a diffuser and wavelength plate onto the rotating wheel, the device size is reduced. Furthermore, only a single spatial light modulator is needed to alternately display P-beam and S-beam images, effectively reducing hardware costs without sacrificing light source brightness.
[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0050] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A laser projection system for 3D projection, characterized in that, It includes a laser source, a first beam direction adjustment component, a second beam direction adjustment component, a rotating wheel, a compound eye, a total reflection prism, a digital micromirror device, and a lens; The first beam direction adjustment component is located at the front end of the laser source and is used to separate the laser into parallel polarized light and vertically polarized light; the second beam direction adjustment component is used to adjust the direction of the vertically polarized light to be parallel to the parallel polarized light; the rotating wheel is located at the front end of the first beam direction adjustment component and the second beam direction adjustment component, and the rotating wheel includes a wavelength plate and a diffuser, which are alternately arranged to form a ring; the compound eye is located at the front end of the rotating wheel; the total internal reflection prism is located at the front end of the rotating wheel; the digital micromirror device is used to modulate the beam reflected by the total internal reflection prism and output it to the total internal reflection prism; the lens is located at the front end of the total internal reflection prism.
2. The laser projection system for 3D projection according to claim 1, characterized in that, It also includes a laser speckle suppressor, which is disposed at the front end of the laser source; and a beam homogenizer, which is disposed between the laser source and the laser speckle suppressor.
3. The laser projection system for 3D projection according to claim 1, characterized in that, The first beam direction adjustment component includes a beam splitter and a set of collecting lens components. The collecting lens components are disposed at the front end of the beam splitter and include a first lens and a second lens.
4. A laser projection system for 3D projection according to claim 1, characterized in that, The second beam direction adjustment assembly includes a first reflector and a set of collecting lens assemblies. The collecting lens assemblies are disposed at the front end of the first reflector and include a first lens and a second lens.
5. A laser projection system for 3D projection according to claim 1, characterized in that, It also includes a third beam direction adjustment component, which includes a second reflector and a third lens, with the third lens disposed at the front end of the second reflector; the third beam direction adjustment component is disposed between the rotating wheel and the compound eye, and is used to adjust the direction of the beam formed by the beam emitted from the second beam direction adjustment component passing through the rotating wheel.
6. A laser projection system for 3D projection according to claim 1, characterized in that, It also includes a fourth beam direction adjustment component, which includes a third reflecting mirror and a fourth lens. The fourth lens is disposed at the front end of the third reflecting mirror. The fourth beam direction adjustment component is disposed between the rotating wheel and the compound eye, and is used to adjust the direction of the beam formed by the parallel polarized light emitted from the first beam direction adjustment component passing through the rotating wheel.
7. A laser projection system for 3D projection according to claim 1, characterized in that, It also includes a fifth beam direction adjustment component, which includes a fourth reflecting mirror, a fifth lens, and a sixth lens. The sixth lens is disposed at the front end of the fifth lens, and the fifth lens is disposed at the front end of the fourth reflecting mirror. The fifth beam direction adjustment component is disposed between the compound eye and the total reflection prism, and is used to adjust the emitted beam of the compound eye to the direction of the total reflection prism.
8. A laser projection system for 3D projection according to claim 1, characterized in that, It also includes a protective glass disposed between the digital micromirror device and the total internal reflection prism.
9. A laser projection system for 3D projection according to claim 1, characterized in that, The lens includes four convex lenses arranged sequentially, so that the light beam incident on the lens passes through the four convex lenses.
10. A laser projection system for 3D projection according to claim 1, characterized in that, The rotating wheel includes five wavelength plates and five diffuser plates, the wavelength plates and diffuser plates being fan-shaped, and the wavelength plates and diffuser plates being alternately arranged to form a ring.