Optical engine and projection device
Patent Information
- Application Number
- CN202521814501.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-25
- Publication Date
- 2026-09-15
- Estimated Expiration
- 2035-08-25
AI Technical Summary
[0005]本申请实施例的光机，通过设置扩散元件以及驱动模块，驱动模块用于驱动所述扩散元件在第一方向和第二方向形成的平面内移动，所述第一方向垂直于所述扩散元件的光轴方向，所述扩散元件用于透射并降低所述第一光源光的相干性，由于第一光源光透过时会产生很多的随机相位，有利于减弱使用该光机的投射图像的散斑；通过设置光引导模块，光引导模块用于反射从所述扩散元件出射的所述第一光源光；所述扩散元件还用于透射并再次降低从所述光引导模块反射回的所述第一光源光的相干性，有利于进一步降低所述第一光源光通过扩散元件后的相干性，从而有利于进一步减弱使用该光机的投射图像的散斑；相较于采用多个透射式楔形棱镜的光机而言，本申请实施例的光机仅采用单个扩散元件，有利于降低光机的成本，从而有利于降低使用该光机的投影设备的成本。
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Figure CN224758878U_ABST
Abstract
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] Current laser projection equipment still suffers from speckle problems. Due to the high coherence of lasers, multiple transmissive wedge prisms are often used to reduce speckle. However, because lasers have high power, using multiple high-temperature resistant transmissive wedge prisms is often costly. Utility Model Content
[0003] This application discloses an optical engine and a projection device, which helps to reduce costs while reducing speckle in the projected image 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 first light source; A diffusion element is used to transmit and reduce the coherence of the light from the first light source; A light guiding module, disposed on the side of the diffuser element away from the light emitting module, is used to receive and reflect the first light source light emitted from the diffuser element; and A driving module is used to drive the diffusion element to move in a plane formed by a first direction and a second direction, wherein the first direction is perpendicular to the optical axis of the diffusion element and the second direction is perpendicular to the first direction; The diffusion element is also used to transmit and reduce the coherence of the first light source light reflected back from the light guiding module.
[0005] The optical engine of this embodiment uses a diffusion element and a driving module. The driving module drives the diffusion element to move within a plane formed by a first direction and a second direction. The first direction is perpendicular to the optical axis of the diffusion element. The diffusion element transmits and reduces the coherence of the first light source. Since the first light source generates many random phases when it passes through, this helps to reduce the speckle of the projected image using the optical engine. A light guiding module is also included to reflect the first light source emitted from the diffusion element. The diffusion element further transmits and reduces the coherence of the first light source reflected back from the light guiding module, further reducing the coherence of the first light source after passing through the diffusion element, thus further reducing the speckle of the projected image using the optical engine. Compared to optical engines using multiple transmissive wedge prisms, the optical engine of this embodiment uses only a single diffusion element, which helps to reduce the cost of the optical engine and thus the cost of the projection equipment using it.
[0006] In one embodiment, the light guiding module includes a first reflective element and a second reflective element; both the first reflective element and the second reflective element are disposed on the side of the diffuser element away from the light emitting module; The first reflective element is used to receive the first light source emitted from the diffuser element and reflect the first light source to the second reflective element; The second reflective element is used to reflect the first light source light back to the diffuser element; the diffuser element is also used to transmit and reduce the coherence of the first light source light emitted from the second reflective element.
[0007] In one embodiment, the light guiding module further includes a focusing lens disposed between the first reflective element and the second reflective element, the focusing lens being used to converge the first light source light emitted from the first reflective element.
[0008] In one embodiment, the light guiding module includes a first reflective element; the first reflective element is disposed on the side of the diffuser element away from the light emitting module; the first reflective element is used to receive the first light source emitted from the diffuser element and reflect the first light source back to the diffuser element; the diffuser element is also used to transmit and reduce the coherence of the first light source emitted from the first reflective element.
[0009] In one embodiment, the first light source has a first polarization state, and the optomechanic further includes a polarization beam splitter and a phase delay element; the polarization beam splitter is disposed on the light emission side of the light emission module, and the phase delay element is disposed between the polarization beam splitter and the diffusion element; the polarization beam splitter is used to receive and reflect the first light source having the first polarization state to the phase delay element.
[0010] In one embodiment, the light guiding module includes a first reflective element disposed on the side of the diffuser away from the phase delay element. The first reflective element and the phase delay element are used to jointly change the first light source light having the first polarization state into a second light source light having the second polarization state, wherein the first polarization state is perpendicular to the second polarization state. The polarization beam splitter is also used to receive and transmit the second light source light having the second polarization state.
[0011] In one embodiment, the angle between the extension plane where the polarization beam splitter is located and the optical axis of the phase delay element is in the range of 40°–50°.
[0012] In one embodiment, the optomechanism further includes a light homogenizing component disposed on the side of the diffusion element away from the light guiding module, the light homogenizing component being used to homogenize the light emitted from the diffusion element.
[0013] In one embodiment, the driving module is further configured to drive the diffusion element to reciprocate within the plane formed by the first direction and the second direction.
[0014] Secondly, this application also relates to a projection device, comprising: Optical engines as described in any of the above embodiments.
[0015] The projection device of this application embodiment, by setting the optical engine described in any of the above embodiments, is beneficial to reducing the coherence of the first light source and reducing the speckle of the projected image; the first light source emitted from the diffusion element is reflected by the light guiding module; the diffusion element transmits and further reduces the coherence of the first light source reflected back from the light guiding module, which is beneficial to further reducing the coherence of the first light source after passing through the diffusion element, thereby further reducing the speckle of the projected image using the optical engine; compared with projection devices that use multiple transmissive wedge prisms, the projection device of this application embodiment only uses a single diffusion element, which is beneficial to reducing the cost of the projection device. Attached Figure Description
[0016] 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.
[0017] Figure 1 This is a schematic diagram of the structure of an optomechanism in one embodiment provided in this application.
[0018] Figure 2 This is a schematic diagram of the structure of the optomechanism in another embodiment provided in this application.
[0019] Figure 3 This is a schematic diagram of the structure of the optomechanism in another embodiment provided in this application.
[0020] Figure 4 This is a schematic diagram of a projection device in one embodiment provided in this application.
[0021] Explanation of key component symbols: Optical Engine 100 Optical emission module 1 Laser 11 Diffusion element 2 Optical axis O Light guiding module 3 First reflective element 31 Second reflective element 32 Focusing lens 35 Driver Module 5 Polarization beam splitter 4 Phase delay element 6 Uniform light component 51 Compound eye lens 511 Lens 512 Light valve 52 Lens assembly 53 First light source L1 Second light source L2 First direction X Second direction Y Projection equipment 900 The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation
[0022] 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.
[0023] 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.
[0024] 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.
[0025] The names of messages or information exchanged between multiple devices in the embodiments of this application are for illustrative purposes only and are not intended to limit the scope of these messages or information.
[0026] Please see Figure 1The optomechanical system 100 of this application embodiment includes a light emitting module 1, a diffusion element 2, a light guiding module 3, and a driving module 5. The light emitting module 1 is used to emit a first light source L1. The diffusion element 2 is used to transmit and reduce the coherence of the first light source L1. The light guiding module 3 is disposed on the side of the diffusion element 2 away from the light emitting module 1, and is used to receive and reflect the first light source L1 emitted from the diffusion element 2; the driving module 5 is used to drive the diffusion element 2 to move in a plane formed by a first direction X and a second direction Y, wherein the first direction X is perpendicular to the optical axis O of the diffusion element 2, and the second direction Y is perpendicular to the first direction X; the diffusion element 2 is also used to transmit and reduce the coherence of the first light source L1 reflected back from the light guiding module 3.
[0027] The optomechanism 100 of this embodiment includes a diffusion element 2 and a driving module 5. The driving module 5 drives the diffusion element 2 to move within a 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 diffusion element 2, and the second direction Y is perpendicular to the first direction X. The diffusion element 2 also transmits and further reduces the coherence of the first light source light L1 reflected back from the light guiding module 3. Since the first light source light L1 generates many random phases when it is transmitted, it is beneficial to reduce the speckle of the projected image using the optomechanism 100. The light guiding module 3 is also included. The first light source light L1 emitted from the diffuser element 2 is reflected; the diffuser element 2 transmits and further reduces the coherence of the first light source light L1 reflected back from the light guiding module 3, which is beneficial to further reduce the coherence of the first light source light L1 after passing through the diffuser element 2, thereby further reducing the speckle of the projected image using the optical engine 100; compared with the optical engine 100 that uses multiple transmissive wedge prisms, the optical engine 100 of this application embodiment only uses a single diffuser element 2, which is beneficial to reduce the cost of the optical engine 100, thereby reducing the cost of the projection equipment using the optical engine 100.
[0028] In some embodiments, the light emitting module 1 includes at least two lasers 11; the lasers 11 can be any of the following: gas lasers, solid-state lasers, semiconductor lasers, liquid lasers, and fiber lasers, without limitation in this application. Each laser 11 is used to independently emit a first sub-source light in one wavelength band, that is, the first source light L1 includes at least two first sub-source light bands (not shown in the figure). For example, the first source light L1 may include a first sub-source light in the red light band and a first sub-source light in the green light band, or the first source light L1 may include a first sub-source light in the green light band, a first sub-source light in the red light band, and a first sub-source light in the blue light band, without limitation in this application. In this embodiment, the first source light L1 has a first polarization state, for example, the first polarization state can be a vertical (S-polarized, S) polarization state or a parallel (P-polarized, P) polarization state, without limitation in this application.
[0029] The diffusion element 2 includes a body (not shown) and a diffusion layer (not shown) disposed on the body. The diffusion layer is used to receive the first light source L1 and reduce the coherence of the incident first light source L1 before emitting it. In some embodiments, the diffusion element 2 can be either a transmissive flat-top diffuser or a transmissive Gaussian diffuser, and this application is not limited thereto. For example, when the diffusion element 2 is a transmissive Gaussian diffuser, since the first light source L1 emitted from the light emitting module 1 has strong coherence, the diffusion layer on the surface of the transmissive Gaussian diffuser has a random surface roughness (such as frosted), which can cause the transmitted first light source L1 to undergo disordered scattering. This results in many random phases being generated when the first light source L1 is transmitted, that is, the transmitted first light source L1 includes multiple beams of light with different phases. In other words, the diffusion element 2 can cause the transmitted first light source L1 to generate many random phases compared to the first light source L1 before incident, thereby reducing the coherence of the incident first light source L1 and helping to reduce the speckle of the projected image using the optical engine 100. By setting the diffusion element 2, it is beneficial to reduce the coherence of the first light source L1, thereby helping to reduce the speckle of the projected image using the optical engine 100.
[0030] In some embodiments, the driving module 5 is further configured to drive the diffusion element 2 to reciprocate within the plane formed by the first direction X and the second direction Y. The driving module 5 can drive the diffusion element 2 in a magnetic induction manner. For example, the driving module 5 may include a substrate (not shown) with the diffusion element 2 fixed on one side, a coil (not shown) fixed on the other side of the substrate, and a plurality of magnets (not shown). The coil generates an induced magnetic field, and the plurality of magnets generate a constant magnetic field in the same direction as the induced magnetic field, thereby generating a driving force, which in turn drives the diffusion element 2 to reciprocate within the plane formed by the first direction X and the second direction Y. In other embodiments, the driving module 5 may also use a motor to drive the diffusion element 2 to reciprocate within the plane formed by the first direction X and the second direction Y. This application does not impose any limitations on this.
[0031] By setting the driving module 5 to drive the diffusion element 2 to reciprocate within the plane formed by the first direction X and the second direction Y, when the first light source L1 passes through the moving diffusion element 2, the first light source L1 will generate different random phases at different times, resulting in more random phases in the first light source L1. This can further reduce the coherence of the first light source L1 over time, thereby helping to further reduce the speckle of the projected image using the optical engine 100.
[0032] In some embodiments, please refer to Figure 1The light guiding module 3 includes a first reflective element 31 and a second reflective element 32. Both the first reflective element 31 and the second reflective element 32 are disposed on the side of the diffuser element 2 away from the light emitting module 1. The angle between the optical axis of the first reflective element 31 and the optical axis of the second reflective element 32 is 90°. The first reflective element 31 receives the first light source light L1 emitted from the diffuser element 2 and reflects the first light source light L1 to the second reflective element 32. The second reflective element 32 reflects the first light source light L1 back to the diffuser element 2; the diffuser element 2 also transmits and reduces the coherence of the first light source light L1 emitted from the second reflective element 32.
[0033] By setting the first reflective element 31 and the second reflective element 32, the first light source light L1 emitted from the diffuser element 2 can be reflected back to the diffuser element 2. The diffuser element 2 can reduce the coherence of the first light source light L1 emitted from the light guiding module 3 for a second time. Compared with the optical engine 100 that uses multiple transmissive wedge prisms, the optical engine 100 of this application embodiment only uses a single diffuser element 2 to achieve the effect of reducing the coherence of the first light source light L1 twice, which is beneficial to reducing the cost of the optical engine 100, thereby reducing the cost of the projection device 900 using the optical engine 100.
[0034] In some embodiments, the light guiding module 3 further includes a focusing lens 35, which is disposed between the first reflecting element 31 and the second reflecting element 32. The focusing lens 35 is used to converge the first light source light L1 emitted from the first reflecting element 31. By disposing the focusing lens 35 between the first reflecting element 31 and the second reflecting element 32, the first light source light L1 emitted from the first reflecting element 31 can be converged, which can further reduce the divergence angle of the first light source light L1 and help reduce the light energy loss of the first light source light L1.
[0035] In some embodiments, please refer to Figure 2 The light guiding module 3 includes only a first reflective element 31. The first reflective element 31 is disposed on the side of the diffuser element 2 away from the light emitting module 1. The light emitting module 1 emits a first light source light L1 toward the diffuser element 2 and the first reflective element 31. The first reflective element 31 is used to receive the first light source light L1 emitted from the diffuser element 2 and reflect the first light source light L1 back to the diffuser element 2. The diffuser element 2 is also used to transmit and reduce the coherence of the first light source light L1 emitted from the first reflective element 31.
[0036] By setting a reflective element (first reflective element 31), the first light source light L1 emitted from the diffuser element 2 can be reflected back to the diffuser element 2. The diffuser element 2 can reduce the coherence of the first light source light L1 emitted from the light guiding module 3 a second time. Compared with the optical engine 100 that uses multiple transmissive wedge prisms, the optical engine 100 of this application embodiment only uses a single diffuser element 2 and a single reflective element to achieve the effect of reducing the coherence of the first light source light L1 twice, which is beneficial to reducing the cost of the optical engine 100, thereby reducing the cost of the projection device 900 using the optical engine 100.
[0037] In some embodiments, please refer to Figure 3 The optomechanical system 100 further includes a polarization beam splitter 4 and a phase delay element 6. The polarization beam splitter 4 is disposed on the light-emitting side of the light-emitting module 1, and the phase delay element 6 is disposed between the polarization beam splitter 4 and the diffusion element 2. The polarization beam splitter 4 is used to receive and reflect the first light source light L1 having a first polarization state to the phase delay element 6. In this embodiment, the phase delay element 6 is a quarter-wave plate; in other embodiments, the phase delay element 6 may also be a half-wave plate, which is not limited in this application. In this embodiment, the polarization beam splitter 4 is generally flat, and the angle between the extending plane of the polarization beam splitter 4 and the optical axis of the phase delay element 6 is in the range of 40°–50°; specifically, the angle between the polarization beam splitter 4 and the optical axis of the phase delay element 6 can be 40°, 42°, 44°, 45°, 46°, 48°, or 50°.
[0038] The light guiding module 3 includes only a first reflecting element 31. The first reflecting element 31 is disposed on the side of the diffuser 2 away from the phase delay element 6. The first reflecting element 31 and the phase delay element 6 are used together to change the first light source light L1 with a first polarization state into a second light source light L2 with a second polarization state. The first polarization state is perpendicular to the second polarization state. For example, when the first polarization state is perpendicular, i.e., the first light source light L1 is s-ray, the polarization beam splitter 4 reflects the first light source light L1, and the phase delay element 6 converts the first light source light L1 into circularly polarized light (e.g., left-handed circularly polarized light). After passing through the diffuser 2 and being reflected by the first reflecting element 31, the rotation direction of the first light source light L1 changes, but the polarization state remains circularly polarized (e.g., from left-handed circularly polarized light to right-handed circularly polarized light). The first light source light L1 passes through the diffuser 2 again and exits from the phase delay element 6, becoming the second light source light L2 with a parallel polarization state, i.e., p-ray, meaning the second polarization state is parallel polarization. The polarization beam splitter 4 is also used to receive and transmit the second light source light L2 with the second polarization state.
[0039] By setting a reflective element (first reflective element 31), the first reflective element 31 and the phase delay element 6 are used to jointly change the first light source light L1 with the first polarization state to the second light source light L2 with the second polarization state. This allows the first light source light L1 emitted from the diffuser element 2 to be reflected back to the diffuser element 2. The diffuser element 2 can reduce the coherence of the first light source light L1 emitted from the light guiding module 3 a second time. Compared with the optical engine 100 that uses multiple transmissive wedge prisms, the optical engine 100 of this embodiment of the application only uses a single diffuser element 2 and a single reflective element to achieve the effect of reducing the coherence of the first light source light L1 twice. This is beneficial to reducing the cost of the optical engine 100, thereby reducing the cost of the projection device 900 that uses the optical engine 100.
[0040] Please refer to the following: Figure 1 , Figure 2 and Figure 3 The optical engine 100 also includes a light homogenizing component 51, a light valve 52, and a lens assembly 53. The light homogenizing component 51 is located on the side of the diffuser 2 away from the light guiding module 3. The light homogenizing component 51 includes a compound eye lens 511 and multiple lenses 512, which work together to homogenize the light emitted from the diffuser 2. By setting the light homogenizing component 51, not only is it beneficial to homogenize the light intensity, but it also helps to achieve a good speckle reduction effect. The light valve 52 is located on the light-emitting side of the light homogenizing component 51 and is used to receive the homogenized light and modulate it into image light (not shown). The light valve 52 can be any one of a Liquid Crystal Display (LCD), a Digital Micro-mirror Device (DMD), or a Liquid Crystal on Silicon (LCOS) device. The lens assembly 53 is used to receive the image light emitted from the light valve 52 and project the image light out at a certain magnification.
[0041] The optical engine 100 of this embodiment drives the diffusion element 2 to move in the plane formed by the first direction X and the second direction Y by the driving module 5. The first direction X is perpendicular to the optical axis O of the diffusion element 2, and the second direction Y is perpendicular to the first direction X. The diffusion element 2 is also used to transmit and further reduce the coherence of the first light source light L1 reflected back from the light guiding module 3. Since the first light source light L1 generates many random phases when it passes through, it is beneficial to reduce the speckle of the projected image using the optical engine 100. By setting the light guiding module 3 to reflect the first light source light L1 emitted from the diffusion element 2, the diffusion element 2 transmits and further reduces the coherence of the first light source light L1 reflected back from the light guiding module 3, which is beneficial to further reduce the coherence of the first light source light L1 after passing through the diffusion element 2, thereby further reducing the speckle of the projected image using the optical engine 100. Compared with an optical engine 100 that uses multiple transmissive wedge prisms, the optical engine 100 of this embodiment only uses a single diffusion element 2, which is beneficial to reducing the cost of the optical engine 100, thereby reducing the cost of the projection equipment using the optical engine 100.
[0042] Please refer to the following: Figure 1 and Figure 4 The projection device 900 provided 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.
[0043] The projection device 900 of this application embodiment, by setting the optomechanism 100 in any of the above embodiments, is beneficial to reducing the coherence of the first light source L1 and reducing the speckle of the projected image. The first light source L1 emitted from the diffuser element 2 is reflected by the light guiding module 3. The diffuser element 2 transmits and further reduces the coherence of the first light source L1 reflected back from the light guiding module 3, which is beneficial to further reducing the coherence of the first light source L1 after passing through the diffuser element 2, thereby further reducing the speckle of the projected image using the optomechanism 100. Compared with the projection device 900 that uses multiple transmissive wedge prisms, the projection device 900 of this application embodiment only uses a single diffuser element 2, which is beneficial to reducing the cost of the projection device 900.
[0044] 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 by, include: The light emitting module is used to emit light from the first light source; A diffusion element is used to transmit and reduce the coherence of the light from the first light source; A light guiding module is disposed on the side of the diffusion element away from the light emitting module, and is used to receive and reflect the first light source light emitted from the diffusion element; as well as A driving module is used to drive the diffusion element to move in a plane formed by a first direction and a second direction, wherein the first direction is perpendicular to the optical axis of the diffusion element and the second direction is perpendicular to the first direction; The diffusion element is also used to transmit and reduce the coherence of the first light source light reflected back from the light guiding module.
2. The optical engine of claim 1, wherein The light guiding module includes a first reflective element and a second reflective element; both the first reflective element and the second reflective element are disposed on the side of the diffuser element away from the light emitting module; The first reflective element is used to receive the first light source emitted from the diffuser element and reflect the first light source to the second reflective element; The second reflective element is used to reflect the light from the first light source back to the diffuser element; The diffusion element is also used to transmit and reduce the coherence of the first light source light emitted from the second reflective element.
3. The optical engine of claim 2, wherein The light guiding module further includes a focusing lens, which is disposed between the first reflective element and the second reflective element, and is used to converge the first light source light emitted from the first reflective element.
4. The optical engine of claim 1, wherein The light guiding module includes a first reflective element; the first reflective element is disposed on the side of the diffuser element away from the light emitting module; the first reflective element is used to receive the first light source emitted from the diffuser element and reflect the first light source back to the diffuser element; the diffuser element is also used to transmit and reduce the coherence of the first light source emitted from the first reflective element.
5. The optical engine of claim 1, wherein The first light source has a first polarization state, and the optomechanic further includes a polarization beam splitter and a phase delay element; the polarization beam splitter is disposed on the light emission side of the light emission module, and the phase delay element is disposed between the polarization beam splitter and the diffusion element; the polarization beam splitter is used to receive and reflect the first light source having the first polarization state to the phase delay element.
6. The optical engine of claim 5, wherein, The light guiding module includes a first reflective element disposed on the side of the diffusion element away from the phase delay element. The first reflective element and the phase delay element are used to jointly change the first light source light having the first polarization state into a second light source light having the second polarization state, wherein the first polarization state is perpendicular to the second polarization state. The polarization beam splitter is also used to receive and transmit the second light source light having the second polarization state.
7. The optical engine of claim 5, wherein, The angle between the extended plane of the polarization beam splitter and the optical axis of the phase delay element is in the range of 40°–50°.
8. The optical engine according to any one of claims 1 to 7, wherein The optical engine also includes a light homogenizing component, which is disposed on the side of the diffusion element away from the light guiding module. The light homogenizing component is used to homogenize the light emitted from the diffusion element.
9. The optical engine according to any one of claims 1 to 7, wherein The driving module is also used to drive the diffusion element to reciprocate within the plane formed by the first direction and the second direction.
10. A projection apparatus, characterized by, include: The optical engine as described in any one of claims 1-9.