Optical engine and projection device

Abstract

The embodiment of the application belongs to the technical field of projection display, and relates to an optical machine, which comprises a light emitting module, a first diffusion element, a second diffusion element and a driving module. The light emitting module is used for emitting light source light. The first diffusion element is arranged on the light emitting side of the light emitting module and is used for receiving and diffusing the light source light emitted by the light emitting module. The second diffusion element is used for receiving and diffusing the light source light emitted by the first diffusion element. The driving module is used for driving the first diffusion element and the second diffusion element to move in a plane respectively. The embodiment of the application also relates to a projection device comprising the optical machine.

Description

Technical Field

[0001] This application relates to the field of projection technology, and in particular to an optical engine and a projection device including the optical engine. Background Technology

[0002] Due to the high coherence of lasers, the images projected by current laser projection devices still have speckle problems. Therefore, how to design an optical engine with good speckle reduction effect for projection devices has become a concern for manufacturers. Utility Model Content

[0003] This application discloses an optical engine and a projection device, which are beneficial for reducing speckle in images projected using the optical engine.

[0004] Firstly, this application relates to an optical engine, comprising: The light emitting module is used to emit light from the light source; A first diffusion element is disposed on the light-emitting side of the light-emitting module, and is used to receive and diffuse the light emitted by the light source from the light-emitting module; A second diffusion element is used to receive and diffuse the light emitted from the first diffusion element; and A driving module is used to drive the first diffusion element and the second diffusion element to move in a plane, respectively.

[0005] The optical engine of this application embodiment, by setting a first diffusion element and a second diffusion element, wherein the first diffusion element is used to receive and diffuse the light source emitted by the light emitting module, and the second diffusion element is used to receive and diffuse the light source emitted by the first diffusion element, can reduce the coherence of the emitted light source in space, which is beneficial to reducing the speckle of the image projected by using the optical engine; by setting a driving module to drive the first diffusion element and the second diffusion element to move in the plane respectively, so that the light source will generate many random phases at different times when passing through the first diffusion element or the second diffusion element, which can reduce the coherence of the emitted light source in time, thereby further reducing the speckle of the projected image using the optical engine, and improving the display effect of the projection device using the optical engine.

[0006] In one embodiment, the driving module is used to drive the first diffusion element to move in a first plane perpendicular to the optical axis of the first diffusion element, and to drive the second diffusion element to move in a second plane parallel to the first plane; or The first diffusion element and the second diffusion element are both located within the first plane, and the driving module is used to drive the first diffusion element and the second diffusion element to move respectively within the first plane; or The driving module is used to drive the first diffusion element to move in the first plane and to drive the second diffusion element to move in the third plane, wherein the third plane and the first plane have an angle between them.

[0007] In one embodiment, when the first diffusion element and the second diffusion element are both in the first plane, the optomechanic further includes a bracket for fixing the first diffusion element and the second diffusion element, and the driving module is used to drive the bracket to move in the first plane so as to simultaneously drive the first diffusion element and the second diffusion element to move in the first plane.

[0008] In one embodiment, the projected area of ​​the second diffusion element on the support is greater than the projected area of ​​the first diffusion element on the support.

[0009] In one embodiment, the optomechanism further includes a reflection module disposed on the light-emitting side of the first diffusion element, for receiving the light source light emitted from the first diffusion element and reflecting the light source light to the second diffusion element; the second diffusion element is used to transmit and diffuse the incident light source light.

[0010] In one embodiment, the light source light includes a first sub-light source light and a second sub-light source light having different wavelength bands; The optical engine further includes a light guiding module, which includes a reflective element and a transflective element. The reflective element is disposed between the first diffusion element and the second diffusion element and is used to reflect the first sub-source light and the second sub-source light to the second diffusion element. The transflective element is disposed on the light-emitting side of the second diffusion element and is used to receive and reflect the first sub-source light and the second sub-source light.

[0011] In one embodiment, the optomechanical system further includes a wavelength conversion module disposed on the side of the transflective element away from the second diffusion element. The wavelength conversion module includes an optical component and a wavelength conversion assembly. The optical component is used to emit a third sub-source light toward the transflective element. The transflective element is also used to reflect the third sub-source light to the wavelength conversion assembly. The wavelength conversion assembly is used to convert the third sub-source light into a fourth sub-source light and then emit it to the transflective element. The transflective element is also used to transmit the fourth sub-source light.

[0012] In one embodiment, the first diffusion element and the second diffusion element have the same / different moving frequencies; the first diffusion element and the second diffusion element have the same / different moving amplitudes; the moving frequency range of the first diffusion element is 60Hz-180Hz, and the moving amplitude of the first diffusion element is greater than 0.5mm; and / or, The second diffusion element has a moving frequency range of 50Hz to 100Hz and a moving amplitude of more than 0.3mm.

[0013] In one embodiment, the first diffusion element is a flat-top diffusion plate or a Gaussian diffusion plate, and the diffusion angle of the first diffusion element is in the range of 2°-4°; The second diffusion element is a flat-top diffusion plate or a Gaussian diffusion plate, and the diffusion angle of the second diffusion element is in the range of 0.5°-1°.

[0014] In one embodiment, the optomechanical system further includes at least one focusing element for receiving and converging incident light from the light source, the at least one focusing element being disposed between the light emitting module and the first diffusion element; and / or, The at least one focusing element is disposed between the first diffusion element and the second diffusion element; and / or, The at least one focusing element is disposed on the light-emitting side of the second diffusion element.

[0015] In one embodiment, the optomechanism further includes a light homogenizing component disposed on the side of the second diffusion element away from the light emitting module, the light homogenizing component being used to homogenize the light emitted from the second diffusion element.

[0016] Secondly, this application also relates to a projection device, comprising: Optical engines as described in any of the above embodiments.

[0017] The projection device of this application embodiment, by setting the optical engine as described in any of the above embodiments, wherein the first diffusion element and the second diffusion element in the optical engine are used to receive and diffuse the light source light respectively, can reduce the coherence of the emitted light source light in space, which is beneficial to reducing the speckle of the image projected using the optical engine; by setting the driving module to drive the first diffusion element and / or the second diffusion element to move in the first plane formed by the first direction and the second direction, so that the light source light will generate many random phases at different times when it passes through, which can reduce the coherence of the emitted light source light in time, thereby further reducing the speckle of the projected image using the optical engine, which is beneficial to improving the display effect of the projection device and improving the user experience. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are 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 optical path of an optomechanism in one embodiment of this application.

[0020] Figure 2 yes Figure 1 The optical path diagram when the optomechanic includes multiple focusing elements.

[0021] Figure 3 This is a schematic diagram of the optical path of the optomechanism in another embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the optical path when the first diffusion element and the second diffusion element are both in the first plane in an embodiment of the optical engine of this application.

[0023] Figure 5 yes Figure 4 A schematic diagram of the structure of the support, the first diffusion element, and the second diffusion element.

[0024] Figure 6 This is a schematic diagram of the optical path of the optomechanism in another embodiment of this application.

[0025] Figure 7 yes Figure 6 A schematic diagram of the wavelength conversion component in the diagram.

[0026] Figure 8 yes Figure 6 The diagram shows the optical path when the wavelength conversion component is a transmissive fluorescent element.

[0027] Figure 9 This is a schematic diagram of a projection device according to an embodiment of this application.

[0028] Explanation of key component symbols: Optical Engine 100 Optical emission module 1 Laser 11 First diffusion element 2 Optical axis o Second diffusion element 3 Driver Module 4 Focusing element 41 Bracket 5 Reflection Module 6 First reflecting mirror 61 Focusing lens 62 Second reflecting mirror 63 Light guiding module 7 Reflective element 71 Transmitter / Reflector 73 Wavelength conversion module 75 Optical component 751 Wavelength conversion component 753 Wavelength conversion material 7531 Uniform light component 81 Optical modulation component 83 Lens Group 831 Beam Spectrometer 833 Light valve 835 Lens assembly 85 Projection equipment 900 Light source L0 First sub-light source L1 Second sub-light source L2 Third Sub-Light Source L3 Fourth Sub-Light Source L4 Image light L6 First direction X Second direction Y The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0029] 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 application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] It should be noted that when a component is described as "fixed to" 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. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this article are for illustrative purposes only.

[0031] It should be noted that the concepts of "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0032] Please see Figure 1The optomechanical system 100 of this application embodiment includes a light emitting module 1, a first diffusion element 2, a second diffusion element 3, and a driving module 4. The light emitting module 1 emits light source light L0. The first diffusion element 2 is disposed on the light emitting side of the light emitting module 1 and is used to receive and diffuse the light source light L0 emitted by the light emitting module 1. The second diffusion element 3 is used to receive and diffuse the light source light L0 emitted by the first diffusion element 2. The driving module 4 drives the first diffusion element 2 and the second diffusion element 3 to move in a plane, specifically, the driving module 4 drives the first diffusion element 2 and / or the second diffusion element 3 to move in a first plane formed by a first direction X and a second direction Y. The first direction X is perpendicular to the optical axis o of the first diffusion element 2, that is, the first plane is perpendicular to the optical axis o of the first diffusion element 2. The second direction Y forms an angle with the first direction X; for example, the second direction Y can be perpendicular to the first direction X.

[0033] The optical engine 100 of this application embodiment, by setting a first diffusion element 2 and a second diffusion element 3, wherein the first diffusion element 2 is used to receive and diffuse the light source light L0 emitted by the light emitting module 1, and the second diffusion element 3 is used to receive and diffuse the light source light L0 emitted by the first diffusion element 2, can reduce the coherence of the emitted light source light L0 in space, which is beneficial to reducing the speckle of the image projected by the optical engine 100; by setting a driving module 4 to drive the first diffusion element 2 and the second diffusion element 3 to move in a plane respectively, the first diffusion element 2 and / or the second diffusion element 3 move in a first plane formed by the first direction X and the second direction Y, so that the light source light L0 will generate many random phases at different times when it passes through, which can reduce the coherence of the emitted light source light L0 in time, thereby further reducing the speckle of the projected image using the optical engine 100 and improving the display effect of the projection device using the optical engine 100.

[0034] The optical emitting module 1 includes at least two lasers 11, each laser 11 being used to independently emit light in a specific wavelength band. The laser 11 can be any of the following: gas laser, solid-state laser, semiconductor laser, liquid laser, and fiber laser; this application makes no limitation thereto. Each laser 11 emits light of the same or different wavelengths. In some embodiments, each laser 11 emits light of different wavelengths, i.e., the light source L0 includes at least two beams of light with different wavelengths. For example, the light source L0 may include three beams of light with different wavelengths, namely a first sub-light source L1, a second sub-light source L2, and a third sub-light source L3, wherein the first sub-light source L1 can be a red laser, the second sub-light source L2 can be a blue laser, and the third sub-light source L3 can be a green laser. In some embodiments, the light source L0 may also include two beams of light with different wavelengths, namely a first sub-light source L1 and a second sub-light source L2, wherein the first sub-light source L1 can be a red laser and the second sub-light source L2 can be a blue laser; or, the first sub-light source L1 can be a blue laser and the second sub-light source L2 can be a green laser. This application does not impose any limitations.

[0035] In some embodiments, the first diffusion element 2 is a flat-top diffuser, and the second diffusion element 3 is a Gaussian diffuser. When the first diffusion element 2 is a flat-top diffuser, the light source light L0 emitted from the flat-top diffuser has a relatively uniform flat-top light intensity distribution, that is, the light intensity at the center and the edge of the light spot of the light source light L0 emitted from the flat-top diffuser are approximately the same. The flat-top diffuser has multiple tiny diffraction structures (not shown in the figure). These tiny diffraction structures can divide the wavefront of the incident light source light L0 into multiple tiny sub-wavefronts. By changing the curvature of each tiny diffraction structure, the phase shift of the light source light L0 emitted from each tiny diffraction structure can be changed, so that the light source light L0 will generate many random phases when it passes through. That is, the transmitted light source light L0 includes multiple rays with different phases. In other words, the first diffusion element 2 can make the coherence of the transmitted light source light L0 lower than that of the light source light L0 before it was incident, thereby spatially destroying the coherence of the light source light L0, which is beneficial to reducing the speckle of the projected image using the optical engine 100.

[0036] When the second diffusion element 3 is a Gaussian diffuser, the light source L0 emitted from the Gaussian diffuser has a relatively uniform Gaussian intensity distribution, that is, the light intensity at the center of the emitted light source L0 spot exhibits a smooth Gaussian decay from the edge. The surface of the Gaussian diffuser has a diffusion layer with random roughness (such as frosted) (not shown in the figure), which can cause disordered scattering of the incident light source L0. As a result, when the light source L0 passes through, it will generate many random phases, that is, the transmitted light source L0 includes multiple rays with different phases. In other words, the second diffusion element 3 can cause the transmitted light source L0 to generate many random phases compared to the light source L0 before it was incident, thereby further reducing the coherence of the incident light source L0, which is beneficial to reducing the speckle of the projected image using the optical engine 100.

[0037] In some embodiments, the first diffusion element 2 is a flat-top diffusion sheet and the second diffusion element 3 is a flat-top diffusion sheet; or, the first diffusion element 2 is a Gaussian diffusion sheet and the second diffusion element 3 is a flat-top diffusion sheet; or, the first diffusion element 2 is a Gaussian diffusion sheet and the second diffusion element 3 is a Gaussian diffusion sheet, and this application does not impose any limitations.

[0038] In some embodiments, the diffusion angle of the first diffusion element 2 ranges from 2° to 4°, that is, the angle between the light source light L0 emitted from the first diffusion element 2 and the optical axis o of the first diffusion element 2 ranges from 2° to 4°; the size of the diffusion angle of the first diffusion element 2 can be any value among 2°, 2.3°, 2.5°, 2.7°, 3°, 3.3°, 3.5°, 3.7°, or 4°. The diffusion angle of the second diffusion element 3 ranges from 0.5° to 1°, that is, the angle between the light source light L0 emitted from the second diffusion element 3 and the optical axis o ranges from 0.5° to 1°; the size of the diffusion angle of the second diffusion element 3 can be any value among 0.5°, 0.6°, 0.7°, 0.8°, 0.9°, or 1°.

[0039] By setting the diffusion angle of the first diffusion element 2 and the diffusion angle of the second diffusion element 3 to the range described above, the divergence angle of the diffusion elements can be reduced while the coherence of the emitted light source light L0 is reduced and the speckle of the projected image using the optical engine 100 is weakened. This reduces the beam of the light source light L0 and minimizes light energy loss. Furthermore, by converging the beam of the light source light L0, the size of the light-collecting cross section of the optical elements (e.g., homogenizing elements) in the subsequent optical path can be reduced, which helps to reduce the cost of the optical elements in the subsequent optical path and thus the cost of the optical engine 100.

[0040] In some embodiments, the ratio of the diffusion angle of the first diffusion element 2 to the diffusion angle of the second diffusion element 3 is 2:1, that is, when the diffusion angle of the first diffusion element 2 is 4°, the diffusion angle of the second diffusion element 3 is 2°; when the diffusion angle of the first diffusion element 2 is 2°, the diffusion angle of the second diffusion element 3 is 1°. By setting the ratio of the diffusion angle of the first diffusion element 2 to the diffusion angle of the second diffusion element 3 to 2:1, the diffusion angle of the first diffusion element 2 is greater than the diffusion angle of the second diffusion element 3, which can further reduce the divergence angle of the diffusion elements, which is beneficial for further focusing the light beam of the light source L0 to reduce light energy loss.

[0041] By setting the first diffusion element 2 as a flat-top diffuser and the second diffusion element 3 as a Gaussian diffuser, and setting the diffusion angle of the first diffusion element 2 to a range of 2°-4° and the diffusion angle of the second diffusion element 3 to a range of 0.5°-1°, the first diffusion element 2 and the second diffusion element 3 together reduce the coherence of the incident light source L0. The light source L0 transmitted from the second diffusion element 3 generates many random phases compared to the light source L0 before incident, further reducing the coherence of the incident light source L0, which is beneficial to reducing the speckle of the projected image using the optical engine 100. In addition, since the diffusion angle of the second diffusion element 3 is smaller than that of the first diffusion element 2, and the light source L0 emitted from the first diffusion element 2 has a relatively uniform flat-top light intensity distribution, the beam of the light source L0 can be further focused to reduce light energy loss. Focusing the beam of the light source L0 is beneficial to reducing the cost of optical components in the subsequent optical path, and thus reducing the cost of the optical engine 100.

[0042] The driving module 4 is used to drive the first diffusion element 2 to reciprocate within a first plane (XY plane) formed by the first direction X and the second direction Y. The driving module 4 is also used to drive the second diffusion element 3 to reciprocate within a second plane parallel to the first plane, that is, both the first diffusion element 2 and the second diffusion element 3 reciprocate within a plane perpendicular to their own optical axes.

[0043] The first diffusion element 2 has a moving frequency range of 60Hz to 180Hz, and a moving amplitude greater than 0.5mm. The moving frequency of the first diffusion element 2 can be any value among 60Hz, 70Hz, 80Hz, 90Hz, 100Hz, 110Hz, 120Hz, 130Hz, 140Hz, 150Hz, 160Hz, 170Hz, or 180Hz. The moving amplitude of the first diffusion element 2 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, or 1.5mm. For example, when the moving frequency of the first diffusion element 2 is 60Hz and the moving amplitude of the first diffusion element 2 is 0.6mm, the first diffusion element 2 vibrates 60 times per second, and the amplitude of each vibration is 0.6mm.

[0044] The second diffuser element 3 has a moving frequency range of 50Hz to 100Hz, and a moving amplitude greater than 0.3mm. The moving frequency of the second diffuser element 3 can be any value among 50Hz, 60Hz, 70Hz, 80Hz, 90Hz, or 100Hz; the moving amplitude of the second diffuser element 3 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm. For example, when the moving frequency of the first diffuser element 2 is 50Hz and the moving amplitude of the first diffuser element 2 is 0.3mm, the first diffuser element 2 vibrates 50 times per second, and the amplitude of each vibration is 0.3mm.

[0045] In some embodiments, the first diffusion element 2 and the second diffusion element 3 have the same moving frequency; the first diffusion element 2 and the second diffusion element 3 have different moving amplitudes; or, the first diffusion element 2 and the second diffusion element 3 have the same moving frequency; the first diffusion element 2 and the second diffusion element 3 have the same moving amplitude; or, the first diffusion element 2 and the second diffusion element 3 have different moving frequencies; the first diffusion element 2 and the second diffusion element 3 have the same moving amplitude; or, the first diffusion element 2 and the second diffusion element 3 have different moving frequencies; the first diffusion element 2 and the second diffusion element 3 have different moving amplitudes.

[0046] By setting the driving module 4 to drive the first diffusion element 2 to reciprocate in the first plane and the second diffusion element 3 to reciprocate in the second plane parallel to the first plane, when the light source L0 passes through the moving first diffusion element 2 or the second diffusion element 3, the light source L0 will generate different random phases at different times, resulting in more random phases in the light source L0. This can further reduce the coherence of the light source L0 in time, thereby helping to further reduce the speckle of the projected image using the optical engine 100. In addition, by setting the moving frequency range of the first diffusion element 2 to 60Hz-180Hz and the moving amplitude of the first diffusion element 2 to be greater than 0.5mm, and setting the moving frequency range of the second diffusion element 3 to 50Hz-100Hz and the moving amplitude of the second diffusion element 3 to be greater than 0.3mm, the situation where the speckle of the projected image still exists due to insufficient movement of the first diffusion element 2 and the second diffusion element 3 can be avoided. Energy consumption can be reduced under the premise that the first diffusion element 2 and the second diffusion element 3 move sufficiently, which is beneficial to reducing the overall power consumption of the optical engine 100.

[0047] The driving module 4 can drive the first diffusion element 2 and the second diffusion element 3 in a magnetic induction manner. For example, the driving module 4 may include a substrate (not shown) with the first diffusion element 2 or the second diffusion element 3 fixed on one side, a coil (not shown) fixed on the other side of the substrate, and multiple magnets (not shown). The coil generates an induced magnetic field, and the multiple magnets generate a constant magnetic field in the same direction as the induced magnetic field, thereby generating a driving force, which can drive the first diffusion element 2 or the second diffusion element 3 to reciprocate within the plane formed by the first direction X and the second direction Y. In other embodiments, the driving module 4 may also use a motor to drive the first diffusion element 2 or the second diffusion element 3 to reciprocate within the plane formed by the first direction X and the second direction Y. This application does not impose any restrictions.

[0048] In some embodiments, please refer to Figure 2 The optomechanical system 100 further includes at least one focusing element 41, which is used to receive and converge the incident light source light L0. The at least one focusing element 41 is disposed between the light emitting module 1 and the first diffusion element 2; or, the focusing element 41 is disposed between the first diffusion element 2 and the second diffusion element 3; or, the at least one focusing element 41 is disposed on the light-emitting side of the second diffusion element 3. By providing at least one focusing element 41, the light source light L0 emitted from the light emitting module 1, or the light source light L0 emitted from the first diffusion element 2 or the second diffusion element 3, can be converged, further reducing the loss of the light source light L0 and thus helping to reduce the loss of the optomechanical system 100.

[0049] In some embodiments, the optical engine 100 includes two focusing elements 41 or three focusing elements 41. For example, when the optical engine 100 includes three focusing elements 41, one focusing element 41 is disposed between the light emitting module 1 and the first diffusion element 2, another focusing element 41 is disposed between the first diffusion element 2 and the second diffusion element 3, and yet another focusing element 41 is disposed on the light emitting side of the second diffusion element 3. This application does not impose any limitations.

[0050] In some embodiments, please refer to Figure 3The optomechanism 100 also includes a reflection module 6, which is disposed on the light-emitting side of the first diffusion element 2. The reflection module 6 includes a first reflecting mirror 61, a focusing mirror 62, and a second reflecting mirror 63. The first reflecting mirror 61 is disposed on the light-emitting side of the first diffusion element 2 and is used to receive the light source light L0 emitted from the first diffusion element 2. The focusing mirror 62 is disposed between the first reflecting mirror 61 and the second reflecting mirror 63 and is used to converge the light source light L0 to the second reflecting mirror 63. The second reflecting mirror 63 is disposed on the light-emitting side of the focusing mirror 62 and is used to reflect the light source light L0 to the second diffusion element 3. The second diffusion element 3 is used to transmit and diffuse the incident light source light L0. By providing the reflection module 6, compared to directly disposing of the second diffusion element 3 on the light-emitting side of the first diffusion element 2, the optical path can be folded, which is beneficial for improving space utilization and thus reducing the size of the optomechanism 100. In other embodiments, the reflection module 6 may also be disposed on the light-emitting side of the second diffusion element 3; this application does not impose any limitations.

[0051] In some embodiments, please refer to the following: Figure 4 and Figure 5 The first diffusion element 2 and the second diffusion element 3 are both located within the first plane (XY plane). The optomechanical system 100 includes a support 5 and a reflection module 6. The support 5 is used to fix the first diffusion element 2 and the second diffusion element 3; for example, the first diffusion element 2 and the second diffusion element 3 are embedded in the support 5. The drive module 4 is used to drive the support 5 to move within the first plane, so as to simultaneously drive the first diffusion element 2 and the second diffusion element 3 to move within the first plane; that is, at this time, the moving frequency and moving amplitude of the first diffusion element 2 and the second diffusion element 3 are the same; the diffusion angles of the first diffusion element 2 and the second diffusion element 3 can be the same or different, which is not limited in this application. The reflection module 6 is located on the side of the support 5 away from the light emitting module 1. The first reflector 61 in the reflection module 6 is located on the light emitting side of the first diffusion element 2 and is used to receive the light source light L0 emitted from the first diffusion element 2. A focusing mirror 62 is disposed between a first reflecting mirror 61 and a second reflecting mirror 63 to focus the light source L0 onto the second reflecting mirror 63. The second reflecting mirror 63 is used to reflect the light source L0 onto the second diffusion element 3. The second diffusion element 3 is used to transmit and diffuse the incident light source L0.

[0052] By setting up the bracket 5 and the reflection module 6, the first diffusion element 2 and the second diffusion element 3 are fixed on the bracket 5, so that the drive module 4 can simultaneously drive the first diffusion element 2 and the second diffusion element 3 to move in the first plane. This is beneficial to further reduce the coherence of the light source L0 over time while reducing the loss of the drive module 4. In addition, by setting up the reflection module 6, the light source L0 emitted from the first diffusion element 2 is reflected to the second diffusion element 3, which can fold the overall optical path, which is beneficial to reduce the size of the optical engine 100 and further reduce the size of the projection device using the optical engine 100.

[0053] In some embodiments, please refer to the following: Figure 4 and Figure 5 The projected area of ​​the second diffuser element 3 on the support 5 is larger than that of the first diffuser element 2 on the support 5. Since the light source L0 has a certain divergence angle during transmission, the spot size of the light source L0 incident on the first diffuser element 2 is larger than that of the light source L0 incident on the second diffuser element 3. By setting the projected area of ​​the second diffuser element 3 on the support 5 to be larger than that of the first diffuser element 2 on the support 5, the luminous flux of the light source L0 incident on the first diffuser element 2 can be increased, which is beneficial to improving the light energy utilization rate of the light source L0.

[0054] In some embodiments, please refer to the following: Figure 6 and Figure 7 The light source L0 includes two beams of light with different wavelengths, namely a first sub-light source L1 and a second sub-light source L2. For example, the first sub-light source L1 can be a red laser, and the second sub-light source L2 can be a blue laser. The driving module 4 is used to drive the second diffusion element 3 to move in a third plane. There is an angle between the third plane and the first plane (XY plane). For example, when the third plane is perpendicular to the first plane, the driving module 4 is used to drive the second diffusion element 3 to move in the third plane perpendicular to the first plane. That is, at this time, the optical axis o of the first diffusion element 2 is perpendicular to the optical axis of the second diffusion element 3. The optomechanical system 100 also includes a light guiding module 7 and a wavelength conversion module 75. The light guiding module 7 includes a reflective element 71 and a transmissive element 73. The reflective element 71 is disposed between the first diffusion element 2 and the second diffusion element 3 and is used to reflect the first sub-light source L1 and the second sub-light source L2 to the second diffusion element 3. The transmissive element 73 is disposed on the light-emitting side of the second diffusion element 3 and is used to receive and reflect the first sub-light source L1 and the second sub-light source L2. For example, when the first sub-source light L1 is a red laser and the second sub-source light L2 is a blue laser, the reflecting element 71 reflects the red laser and the blue laser to the second diffusion element 3, and the transmissive element 73 reflects the red laser and the blue laser.

[0055] A wavelength conversion module 75 is disposed on the side of the transflective element 73 away from the second diffusion element 3. The wavelength conversion module 75 includes an optical component 751 and a wavelength conversion component 753. The optical component 751 is disposed on the side of the transflective element 73 away from the second diffusion element 3. The optical component 751 is used to emit a third sub-source light L3 toward the transflective element 73. In some embodiments, the third sub-source light L3 is a blue laser; in other embodiments, the third sub-source light L3 may also be a red laser or a green laser.

[0056] The transflection element 73 is also used to reflect the third sub-source light L3 to the wavelength conversion component 753. The wavelength conversion component 753 is used to convert the third sub-source light L3 into the fourth sub-source light L4 and then reflect it to the transflection element 73. The transflection element 73 is also used to transmit the fourth sub-source light L4.

[0057] In some embodiments, please refer to the following: Figure 6 and Figure 7 The wavelength conversion component 753 is a reflective fluorescent element. The wavelength conversion component 753 includes a wavelength conversion material 7531 disposed on a surface near the transflective element 73. The wavelength conversion material 7531 is a fluorescent ceramic material, which can be any one of oxide ceramic materials, nitride ceramic materials, and oxynitride ceramic materials. The wavelength conversion component 753 receives the third sub-source light L3, and after being excited, converts the third sub-source light L3 into a fourth sub-source light L4 before emitting it. For example, when the third sub-source light L3 is a blue laser and the wavelength conversion material 7531 is a green fluorescent ceramic material, the wavelength conversion component 753 receives the blue laser (third sub-source light L3), and after being excited, converts the blue laser (third sub-source light L3) into green fluorescence (fourth sub-source light L4) before emitting it. The transflective element 73 is also used to transmit the green fluorescence (fourth sub-source light L4).

[0058] In some embodiments, please refer to the following: Figure 7 and Figure 8 The wavelength conversion component 753 is a transmissive fluorescent element. The wavelength conversion component 753 can be set on the light-emitting side of the light component 751, so that the third sub-light source light L3 emitted from the light component 751 can be absorbed by the wavelength conversion component 753 as much as possible. The wavelength conversion component 753 converts the third sub-light source light L3 into the fourth sub-light source light L4 and then emits it to the transmissive reflective element 73. The transmissive reflective element 73 is also used to transmit the fourth sub-light source light L4.

[0059] Please refer to the following: Figure 1 , Figure 4 and Figure 6The optical engine 100 also includes a homogenizing component 81, a light modulation component 83, and a lens assembly 85. The homogenizing component 81 is disposed on the side of the second diffuser 3 away from the light emitting module 1, and is used to homogenize the light emitted from the second diffuser 3. The homogenizing component 81 can be any one of a light bar, a light channel, or a compound eye lens. For example, when the homogenizing component 81 is a compound eye lens, the working angle of the compound eye lens can be set to be greater than 10°, which is beneficial to improving the utilization rate of the light source L0. By setting the homogenizing component 81, the homogenizing component 81 can convert the incident light at its incident end into multiple beams with their own optical axes and emit them from its exit end. Each beam with an independent optical axis can perform a homogenizing process, thereby achieving large-area homogenization of the light source L0. By setting the homogenizing component 81, it is not only beneficial to homogenize the light intensity of the light source L0, but also to achieve a good speckle reduction effect.

[0060] The light modulation component 83 receives the homogenized light source L0 and modulates it into image light L6. The light modulation component 83 includes a lens group 831, a beam splitter 833, and a light valve 835 arranged sequentially. The light valve 835 modulates the light source L0 into image light L6, which, after being output, can be used to display a projected image. In this embodiment, the light valve 835 is a liquid crystal on silicon (LCOS) imaging device. When the light source L0 is reflected by the beam splitter 833 onto the light valve 835, the light valve 835 changes the polarization state of the portion of light to be imaged according to the image content, so that the image light L6 is reflected back to the beam splitter 833 by the light valve 835 and transmitted out to the lens. In other embodiments, the light valve 835 can be either a digital micromirror device (DMD) or a liquid crystal on silicon (LCOS) device; this application is not limited to either. The lens assembly 85 is used to receive the image light L6 emitted from the beam splitter 833 and project the image light L6 at a certain magnification.

[0061] The optical engine 100 of this application embodiment, by setting a first diffusion element 2 and a second diffusion element 3, wherein the first diffusion element 2 is used to receive and diffuse the light source light L0 emitted by the light emitting module 1, and the second diffusion element 3 is used to receive and diffuse the light source light L0 emitted by the first diffusion element 2, can reduce the coherence of the emitted light source light L0 in space, which is beneficial to reducing the speckle of the image projected by the optical engine 100; by setting a driving module 4 to drive the first diffusion element 2 and / or the second diffusion element 3 to move in the first plane formed by the first direction X and the second direction Y, the light source light L0 will generate many random phases at different times when it passes through, which can reduce the coherence of the emitted light source light L0 in time, thereby further reducing the speckle of the projected image using the optical engine 100 and improving the display effect of the projection device 900 using the optical engine 100.

[0062] Please refer to the following: Figure 1 and Figure 9 The projection device 900 in this application embodiment includes the optical engine 100 in any of the above embodiments. The projection device 900 can be an electronic device with projection function, such as a projector or a projectoring instrument.

[0063] The projection device 900 of this application embodiment, by setting the optical engine 100 in any of the above embodiments, wherein the first diffusion element 2 and the second diffusion element 3 in the optical engine 100 are used to receive and diffuse the light source L0 respectively, can reduce the coherence of the emitted light source L0 in space, which is beneficial to reducing the speckle of the image projected by using the optical engine 100; by setting the driving module 4 to drive the first diffusion element 2 and / or the second diffusion element 3 to move in the first plane formed by the first direction X and the second direction Y, so that the light source L0 will generate many random phases at different times when it passes through, which can reduce the coherence of the emitted light source L0 in time, thereby further reducing the speckle of the projected image using the optical engine 100, which is beneficial to improving the display effect of the projection device 900 and improving the user's user experience.

[0064] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An optical engine, characterized in that, include: The light emitting module is used to emit light from the light source; A first diffusion element is disposed on the light-emitting side of the light-emitting module, and is used to receive and diffuse the light emitted by the light source from the light-emitting module; The second diffusion element is used to receive and diffuse the light emitted by the first diffusion element; as well as A driving module is used to drive the first diffusion element and the second diffusion element to move in a plane, respectively.

2. The optical engine according to claim 1, characterized in that, The driving module is used to drive the first diffusion element to move in a first plane perpendicular to the optical axis of the first diffusion element, and to drive the second diffusion element to move in a second plane parallel to the first plane; or The first diffusion element and the second diffusion element are both located in the first plane, and the driving module is used to drive the first diffusion element and the second diffusion element to move respectively in the first plane; or The driving module is used to drive the first diffusion element to move in the first plane and to drive the second diffusion element to move in the third plane, wherein the third plane and the first plane have an angle between them.

3. The optical engine according to claim 2, characterized in that, When the first diffusion element and the second diffusion element are both in the first plane, the optomechanic further includes a bracket for fixing the first diffusion element and the second diffusion element, and the drive module is used to drive the bracket to move in the first plane so as to simultaneously drive the first diffusion element and the second diffusion element to move in the first plane.

4. The optical engine according to claim 3, characterized in that, The projected area of ​​the second diffusion element on the support is greater than the projected area of ​​the first diffusion element on the support.

5. The optical engine according to claim 1, characterized in that, The optomechanism further includes a reflection module, which is disposed on the light-emitting side of the first diffusion element and is used to receive the light source emitted from the first diffusion element and reflect the light source to the second diffusion element. The second diffusion element is used to transmit and diffuse the incident light source.

6. The optical engine according to claim 1, characterized in that, The light source includes a first sub-light source light and a second sub-light source light with different wavelength bands; The optical engine further includes a light guiding module, which includes a reflective element and a transmissive element. The reflective element is disposed between the first diffusion element and the second diffusion element and is used to reflect the first sub-source light and the second sub-source light to the second diffusion element. The light-emitting element is disposed on the light-emitting side of the second diffusion element and is used to receive and reflect the light from the first sub-source light source and the second sub-source light source.

7. The optical engine according to claim 6, characterized in that, The optomechanical system further includes a wavelength conversion module disposed on the side of the transflective element away from the second diffusion element. The wavelength conversion module includes an optical component and a wavelength conversion component. The optical component is used to emit a third sub-source light towards the transflective element. The transflective element is also used to reflect the third sub-source light to the wavelength conversion component. The wavelength conversion component is used to convert the third sub-source light into a fourth sub-source light and then emit it to the transflective element. The transflective element is also used to transmit the fourth sub-source light.

8. The optical engine according to claim 1, characterized in that, The first and second diffusion elements have the same / different moving frequencies; the first and second diffusion elements have the same / different moving amplitudes; the moving frequency range of the first diffusion element is 60Hz-180Hz, and the moving amplitude of the first diffusion element is greater than 0.5mm; and / or, The second diffusion element has a moving frequency range of 50Hz to 100Hz and a moving amplitude of more than 0.3mm.

9. The optical engine according to claim 1, characterized in that, The first diffusion element is a flat-top diffusion plate or a Gaussian diffusion plate, and the diffusion angle of the first diffusion element is in the range of 2°-4°; The second diffusion element is a flat-top diffusion plate or a Gaussian diffusion plate, and the diffusion angle of the second diffusion element is in the range of 0.5°-1°.

10. The optical engine according to claim 1, characterized in that, The optomechanical system further includes at least one focusing element, which is used to receive and converge the incident light from the light source, and the at least one focusing element is disposed between the light emitting module and the first diffusion element; And / or, The at least one focusing element is disposed between the first diffusion element and the second diffusion element; and / or, The at least one focusing element is disposed on the light-emitting side of the second diffusion element.

11. The optical engine according to claims 1-10, characterized in that, The optical engine further includes a light homogenizing component, which is disposed on the side of the second diffusion element away from the light emitting module. The light homogenizing component is used to homogenize the light emitted from the second diffusion element.

12. A projection device, characterized in that, include: The optical engine as described in any one of claims 1-11.

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