Light machine and projection equipment

Abstract

The utility model relates to an optical machine which comprises a light source module, a diffusion element and a light collecting and reflecting module. The light source module is used for emitting light source light. The diffusion element is arranged on the light emitting side of the light source module and used for reflecting and diffusing the light source light emitted from the light source module. The light collecting and reflecting module is arranged between the light source module and the diffusion element. The light collecting and reflecting module is used for converging and reflecting the light source light emitted from the diffusion element. The utility model further relates to projection equipment comprising the light machine.

Description

Technical Field

[0001] The present disclosure relates to the field of optical technologies, and in particular, to an optical engine and a projection device including the optical engine. Background Art

[0002] Currently, there are still problems with speckles in the images projected by laser projection devices. The current main solution is to use a dynamic transmissive diffusing element (such as a transmissive rotating diffusing wheel) to eliminate speckles. However, the above-mentioned dynamic transmissive diffusing element often has too small a diffusion angle and is difficult to greatly reduce the coherence of the light source light, that is, it is difficult to achieve the purpose of dissipating speckles. Summary of the Utility Model

[0003] The present disclosure discloses an optical engine and a projection device, which are beneficial to reducing speckles in the projection screen.

[0004] In a first aspect, the present disclosure relates to an optical engine, including:

[0005] A light source module for emitting light source light;

[0006] A diffusing element disposed on the light-emitting side of the light source module for reflecting and diffusing the light source light emitted from the light source module; and

[0007] A light collecting and reflecting module disposed between the light source module and the diffusing element, the light collecting and reflecting module being configured to converge and reflect the light source light emitted from the diffusing element.

[0008] The optical engine provided by the embodiments of the present disclosure can effectively increase the diffusion angle by providing a diffusing element for reflecting and diffusing the light source light, thereby being beneficial to greatly reducing the coherence between the light source lights, and further can achieve the effect of reducing speckles, being beneficial to improving the display effect of the projection device using the optical engine and ensuring the user's viewing experience.

[0009] In one embodiment, the light collecting and reflecting module is configured to transmit the light source light emitted from the light source module to the diffusing element, or, the light collecting and reflecting module is configured to allow the light source light to pass through and be incident on the diffusing element.

[0010] In one embodiment, the light collecting and reflecting module is provided with a reflective layer, and the reflective layer is configured to receive and reflect the light source light emitted from the diffusing element.

[0011] In one embodiment, the light collecting and reflecting module further includes a first substrate and an anti-reflection layer; the reflective layer covers one side of the first substrate close to the diffusing element, the first substrate surrounds or semi-surrounds the anti-reflection layer, the anti-reflection layer is configured to transmit the light source light emitted from the light source module, and the light source light is transmitted from the anti-reflection layer to the diffusing element.

[0012] In one embodiment, the light collection and reflection module is provided with a light passing hole, and the light passing hole is used to transmit the light source light emitted from the light source module.

[0013] In one embodiment, the light collection and reflection module is used to transmit the sub-light source light with a first polarization direction emitted from the light source module, and reflect the sub-light source light with a second polarization direction.

[0014] In one embodiment, a phase delay module is further provided between the light collection and reflection module and the diffusion element, and the phase delay module and the diffusion element are used to jointly convert the light source light with the first polarization direction into the light source light with the second polarization direction.

[0015] In one embodiment, the light source light includes multiple light rays with different wavelengths, and the phase delay module includes multiple phase delay plates with different thicknesses. The phase delay plates with different thicknesses are used to make the incident light rays with different wavelengths all generate an odd multiple of the phase delay and then exit.

[0016] In one embodiment, the optical engine further includes a driving module, and the driving module is used to drive the diffusion element to move relative to the light source module.

[0017] In one embodiment, the optical engine further includes a light guiding module. The light guiding module is disposed on the light emitting side of the light collection and reflection module, and the light guiding module is used to receive and guide the light source light emitted from the light collection and reflection module.

[0018] In one embodiment, the light guiding module further includes a light homogenizing component, a light modulation component, and a lens component;

[0019] The light homogenizing component is disposed on one side where the light collection and reflection module emits the light source light, and the light homogenizing component is used to homogenize the light source light; the light modulation component is used to receive the homogenized light source light and modulate the light source light into image light; the lens component is used to receive the image light and project the image light out.

[0020] In a second aspect, the present disclosure further provides a projection device, including the optical engine in any of the above embodiments.

[0021] The projection device provided by the present disclosure, by setting the optical engine described in any of the above embodiments, can more effectively increase the diffusion angle, thereby being conducive to greatly reducing the coherence between the light source lights, and further can achieve the effect of weakening speckles, being conducive to improving the display effect of the projection device using this optical engine and ensuring the user's viewing experience. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the optical path structure of the optical engine in the first embodiment provided by the present disclosure.

[0024] Figure 2 It is a schematic diagram of the structure of the transmissive-reflective element in the first embodiment provided by the present disclosure.

[0025] Figure 3 It is a schematic diagram of the optical path structure with different transmissive-reflective elements in the first embodiment provided by the present disclosure.

[0026] Figure 4 It is a schematic diagram of the structures of different transmissive-reflective elements in the first embodiment provided by the present disclosure.

[0027] Figure 5 It is a schematic diagram of the optical path structure of the optical engine in the second embodiment provided by the present disclosure.

[0028] Figure 6 It is a schematic diagram of the structure of the reflective element in the second embodiment provided by the present disclosure.

[0029] Figure 7 It is a schematic diagram of the optical path structure with different reflective elements in the second embodiment provided by the present disclosure.

[0030] Figure 8 It is a schematic diagram of the structures of different reflective elements in the second embodiment provided by the present disclosure.

[0031] Figure 9 It is a schematic diagram of the optical path structure when the reflective element in the second embodiment has no light passing hole.

[0032] Figure 10 It is a schematic diagram of the optical path structure of the optical engine in the third embodiment provided by the present disclosure.

[0033] Figure 11 It is a partial schematic diagram of the optical path structure with phase delay plates of different thicknesses in the third embodiment provided by the present disclosure.

[0034] Main element symbol description Optical engines 100, 200, 300

[0035] Light source module 1

[0036] Diffusion element 3

[0037] Diffusion angle α

[0038] Optical axis o

[0039] Drive module 4

[0040] Light collection and reflection module 5

[0041] Focusing lens 51

[0042] Transmissive and reflective element 53

[0043] First substrate 531

[0044] Reflection layer 533

[0045] Anti-reflection layer 535

[0046] Reflection element 55

[0047] Second substrate 551

[0048] Light passing hole 553

[0049] Polarizing beam splitter element 57

[0050] Phase retardation module 59

[0051] Quarter-wave plate 591

[0052] Phase retardation plate 593

[0053] Light guiding module 6

[0054] Light homogenizing component 61

[0055] Light modulation component 63

[0056] Lens group 631

[0057] Beam splitter 633

[0058] Light valve 635

[0059] Lens assembly 65

[0060] Light source light L1

[0061] Sub-light source light L10

[0062] Image light L2 Specific implementation mode

[0063] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0064] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0065] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or mutual dependence relationship of the functions performed by these devices, modules or units.

[0066] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only for illustrative purposes and are not used to limit the scope of these messages or information.

[0067] How to design an optical engine for a projector with a simple structure, uniform color and good speckle dissipation effect has always been a concern for manufacturers. At present, the main solution is to use a transmissive diffuser and a dynamic optical element (for example, a transmissive rotating diffuser wheel) to eliminate speckles. By rotating the transmissive diffuser, a random phase is provided to the light converging on the transmissive diffuser, thereby reducing the coherence between the light rays. However, due to the inherent properties of the material, the diffusion angle of the transmissive diffuser is generally only a few degrees to more than a dozen degrees. When the diffusion angle of the diffuser is too small, it is often difficult to significantly reduce the coherence of the light source light, that is, it is difficult to achieve the purpose of speckle dissipation.

[0068] The optical engine of the embodiment of the present disclosure includes a light source module, a diffusion element and a light collecting and reflecting module. The light source module is used to emit light source light. The diffusion element is arranged on the light-emitting side of the light source module and is used to reflect and diffuse the light source light emitted from the light source module. The light collecting and reflecting module is arranged between the light source module and the diffusion element, and the light collecting and reflecting module is used to converge and reflect the light source light emitted from the diffusion element.

[0069] Embodiment 1

[0070] Please refer to Figure 1 , the optical engine 100 of the first embodiment of the present disclosure includes a light source module 1, a diffusion element 3 and a light collecting and reflecting module 5.

[0071] The light source module 1 is used to emit the light source light L1. The light source module 1 includes at least one laser (not shown in the figure), and the laser is used to emit the light source light L1. When the light source module 1 includes multiple lasers, the multiple lasers can emit lasers with different wavelengths, that is, the light source light L1 can include multiple lasers with different wavelengths. For example, the light source module 1 may include two lasers, namely the first laser and the second laser. The first laser includes four lamp beads (not shown in the figure) for emitting red light, and the second laser also includes four lamp beads, two of which are used to emit green light and the other lamp beads are used to emit blue light, so that the light source light L1 emitted from the light source module 1 includes multiple lasers with different wavelengths. In other embodiments, multiple lamp beads for emitting light with a single wavelength may be provided on each laser, and the present disclosure is not limited thereto.

[0072] The diffusion element 3 is disposed on the light-emitting side of the light source module 1 and is used to reflect and diffuse the light source light L1 emitted from the light source module 1. When the light source light L1 is incident on the diffusion element 3, the diffusion element 3 reflects the light source light L1 in different directions, that is, the light source light L1 is scattered. Specifically, a large number of diffusion particles (not shown in the figure) are provided on the surface of the diffusion element 3 close to the light source module 1. The size and shape of the diffusion particles are irregular, and the diffusion particles are irregularly distributed, so that the spatial coherence of the light source light L1 can be destroyed, and thus the speckle can be eliminated or reduced.

[0073] Define the angle between the light source light L1 emitted from the diffusion element 3 and the optical axis o as the diffusion angle α. In this embodiment, the diffusion angle α follows a Lambert distribution and the range of the diffusion angle α is 0° - 90°. Specifically, the magnitude of the diffusion angle α can be any value in the range of 0° - 20°, 20° - 40°, 40° - 60° or 60° - 90°. Compared with using a transmissive diffuser, the diffusion angle α of the reflective diffusion element 3 has a larger angular range, which is beneficial to greatly reducing the coherence between the light source lights L1, and thus can achieve the effect of weakening the speckle. In addition, since the diffusion angle α follows a Lambert distribution, when the diffusion angle α of the light source light L1 emitted from the diffusion element 3 approaches 90°, the intensity of the light source light L1 is the smallest, so there will be no excessive energy loss of the light source light L1.

[0074] In this embodiment, the optical engine 100 further includes a driving module 4, and the driving module 4 is used to drive the diffusion element 3 to move relative to the light source module 1. For example, the diffusion element 3 can reciprocate linearly relative to the light source module 1 (e.g., along Figure 1move horizontally left and right (but not limited to this), or the diffusion element 3 can rotate periodically relative to the light source module 1. By movably arranging the diffusion element 3 on the light-emitting side of the light source module 1, the reflection and diffusion effects of the diffusion element 3 can be further improved, and overheating of the diffusion element 3 caused by excessive energy of the light source light L1 can be prevented, which is beneficial to the heat dissipation of the diffusion element 3 and thus beneficial to extending the service life of the diffusion element 3.

[0075] The light-collecting and reflecting module 5 is arranged between the light source module 1 and the diffusion element 3, and the light-collecting and reflecting module 5 is used to converge and reflect the light source light L1 emitted from the diffusion element 3.

[0076] In this embodiment, the light-collecting and reflecting module 5 includes a focusing lens 51 and a transmissive and reflective element 53. The focusing lens 51 is arranged between the transmissive and reflective element 53 and the diffusion element 3. The focusing lens 51 is used to receive and converge the light source light L1 emitted from the diffusion element 3. Specifically, the diffusion element 3 is located at the focal length of the focusing lens 51. When the light source light L1 is incident on the diffusion element 3, the diffusion element 3 reflects the light source light L1 in different directions, and the focusing lens 51 receives the light source light L1 incident in different directions and emits multiple beams of light source light L1 in the same direction, that is, collimates the light source light L1 from the diffusion element 3. By arranging the focusing lens 51, the light source light L1 diffusely emitted from the diffusion element 3 can be converged to the transmissive and reflective element 53, which is beneficial to reducing the loss of light energy.

[0077] The light source light L1 emitted from different positions of the focusing lens 51 in the same direction is incident on the transmissive and reflective element 53. The transmissive and reflective element 53 is arranged between the focusing lens 51 and the light source module 1. The transmissive and reflective element 53 includes a first substrate 531, a reflective layer 533 covering the side of the first substrate 531 close to the diffusion element 3, and an antireflection layer 535. The material of the first substrate can be any one of glass and plastic.

[0078] The reflective layer 533 is used to receive and reflect the light source light L1 emitted from the focusing lens 51. The reflective layer 533 can be any one of a metal reflective layer, a fully dielectric reflective layer, and a metal-dielectric reflective layer.

[0079] Please refer to Figure 1 and Figure 2, in this embodiment, the first substrate 531 is disposed around the anti-reflection layer 535, that is, the anti-reflection layer 535 penetrates through the first substrate 531 and is embedded in the first substrate 531. The anti-reflection layer 535 is used to transmit the light source light L1 emitted from the light source module 1. The light source light L1 is transmitted from the anti-reflection layer 535 through the focusing lens 51 to the diffusion element 3. The emission direction of the light source light L1 when it is emitted from the light source module 1 is perpendicular to the surface of the diffusion element 3 that receives and reflects the light source light L1. The anti-reflection layer 535 is disposed on the optical path of the light source light L1 so that the light source light L1 can pass through the anti-reflection layer 535 and be incident on the diffusion element 3; in other embodiments, the light source light L1 emitted from the light source module 1 may also have other emission directions, as long as it can pass through the anti-reflection layer 535 and be incident on the diffusion element 3 through the focusing lens 51, and the present disclosure is not limited thereto. By providing the transmissive-reflective layer and the reflective layer 533, the light source light L1 emitted from the light source module 1 can be transmitted from the anti-reflection layer 535 through the focusing lens 51 to the diffusion module, and the light source light L1 reflected back from the diffusion module through the focusing lens 51 to the transmissive-reflective element 53 can be reflected and emitted by the reflective layer 533.

[0080] Specifically, the area of the surface of the anti-reflection layer 535 facing the light source module 1 is less than 20% of the total area of the surface of the transmissive-reflective element 53 facing the light source module 1. For example, the area of the surface of the anti-reflection layer 535 facing the light source module 1 can account for 10% of the total area of the surface of the transmissive-reflective element 53 facing the light source module 1. By providing the anti-reflection layer 535 with a suitable area size, excessive light energy loss can be avoided, and it is beneficial for the light source light L1 incident on the reflective layer 533 to be more fully reflected.

[0081] Please refer to Figure 3 and Figure 4 , in other embodiments, the first substrate 531 is semi-surrounded by the anti-reflection layer 535, and the anti-reflection layer 535 is used to transmit the light source light L1 emitted from the light source module 1. The light source light L1 is converged from the anti-reflection layer 535 through the focusing lens 51 to the diffusion element 3. The light source light L1 emitted from the light source module 1 can have any emission direction, as long as it can pass through the anti-reflection layer 535 and be incident on the diffusion element 3 through the focusing lens 51, and the present disclosure is not limited thereto.

[0082] Please refer to Figure 1 , the optical engine 100 further includes a light guiding module 6. The light guiding module 6 is disposed on the light-emitting side of the light collecting and reflecting module 5. The light guiding module 6 is used to receive and guide the light source light L1 emitted from the light collecting and reflecting module 5. The light guiding module 6 further includes a light homogenizing component 61, a light modulation component 63, and a lens component 65.

[0083] The light homogenizing component 61 is disposed on one side of the light source light L1 emitted by the light collecting and reflecting module 5. The light homogenizing component 61 is used to receive the light source light L1 emitted from the light collecting and reflecting module 5 and homogenize the light source light L1. The light homogenizing component 61 can convert the incident light at its incident end into multiple light beams each having its own optical axis o and emit them from its exit end. Each light beam with an independent optical axis o can achieve a light homogenizing process, thereby realizing large-area homogenization of the light source light L1. By providing the light homogenizing component 61, it is not only beneficial to uniform the light intensity of the light source light L1 but also beneficial to achieve a good speckle dissipation effect.

[0084] The light modulation component 63 is used to receive the homogenized light source light L1 and modulate the light source light L1 into image light L2. The light modulation component 63 includes a lens group 631, a beam splitter 633, and a light valve 635 arranged in sequence.

[0085] The lens group 631 is used to image the light source light L1 at the exit end of the light homogenizing component 61 to the incident end of the beam splitter 633. By providing the lens group 631, the light source light L1 at the exit end of the light homogenizing component 61 can be transmitted to the incident end of the beam splitter 633, which can improve the utilization rate of the light beam emitted from the exit end of the light homogenizing component 61.

[0086] The beam splitter 633 is disposed between the lens group 631 and the light valve 635. The beam splitter 633 is used to guide the light source light L1 to the light valve 635 and guide the image light L2 emitted from the light valve 635 to the lens module.

[0087] The light valve 635 is used to modulate the light source light L1 into image light L2. In this embodiment, the light valve 635 is a liquid crystal on silicon (LCOS) imaging device. When the light source light L1 is reflected by the beam splitter 633 onto the light valve 635, the light valve 635 changes the polarization state of the light of the part to be imaged according to the imaging content, so that the image light L2 is reflected back to the beam splitter 633 by the light valve 635 and transmitted out to the lens. In other embodiments, the light valve 635 can be any one of a digital micro-mirror device (DMD) and a liquid crystal on silicon (LCOS) device, but is not limited thereto.

[0088] The lens assembly 65 is used to receive the image light L2 emitted from the beam splitter 633 and project the image light L2 out at a certain magnification.

[0089] In the first embodiment of the present disclosure, for the optical engine 100, by providing a diffusion element 3 for reflecting and diffusing the light source light L1, the diffusion angle can be effectively increased; and then by providing a focusing lens 51 and a transmissive-reflective element 53 to converge and reflect the light source light L1 emitted from the diffusion element 3, it is beneficial to greatly reduce the coherence between the light source lights L1, and thus the speckle can be reduced, which is beneficial to improving the display effect of the projection device using the optical engine 100 and ensuring the viewing experience of users.

[0090] Embodiment Two

[0091] Please refer to Figure 5 , the difference between this second embodiment and the first embodiment is that the light collecting and reflecting module 5 includes a focusing lens 51 and a reflecting element 55.

[0092] The focusing lens 51 is disposed between the reflecting element 55 and the diffusion element 3, and the focusing lens 51 is configured to receive and converge the light source light L1 emitted from the diffusion element 3. Specifically, the diffusion element 3 is located at the focal length of the focusing lens 51. When the light source light L1 is incident on the diffusion element 3, the diffusion element 3 reflects the light source light L1 in different directions, and the focusing lens 51 receives the light source light L1 incident in different directions and emits multiple beams of the light source light L1 in the same direction. The light source light L1 emitted in the same direction from different positions of the focusing lens 51 is incident on the reflecting element 55. By providing the focusing lens 51, the light source light L1 diffusely emitted from the diffusion element 3 can be converged to the reflecting element 55, which is beneficial to reducing the loss of light energy.

[0093] The reflecting element 55 is disposed between the focusing lens 51 and the light source module 1. The reflecting element 55 includes a second substrate 551 and a reflecting layer 533 covering one side of the second substrate 551 close to the diffusion element 3. The light source light L1 passes through the reflecting element 55 and is incident on the diffusion element 3. The reflecting layer 533 is configured to receive and reflect the light source light L1 emitted from the focusing lens 51. The reflecting layer 533 can be any one of a metal reflecting layer 533, a fully dielectric reflecting layer 533, and a metal-dielectric reflecting layer 533.

[0094] Please refer to Figure 6 , the material of the second substrate can be any one of glass and plastic. In this embodiment, the second substrate 551 is provided with a light passing hole 553, and the light passing hole 553 is configured to transmit the light source light L1 emitted from the light source module 1. Specifically, the light passing hole 553 can be provided at the intersection of the diagonals of the second substrate 551. Please refer to Figure 7 and Figure 8, an optical through-hole 553 may also be formed at the middle position of any side edge of the second substrate 551. The light source light L1 emitted from the light source module 1 may have any emission direction, as long as it can pass through the optical through-hole 553 and enter the diffusion element 3 through the focusing lens 51, and the present disclosure does not make any restrictions.

[0095] Please refer to Figure 9 , in other embodiments, the second substrate 551 is not provided with the optical through-hole 553, and the light source light L1 emitted from the light source module 1 does not need to pass through the reflection component and directly enters the focusing lens 51. The focusing lens 51 is used to converge the light source light L1 emitted from the light source module 1 and project the light source light L1 onto the diffusion element 3.

[0096] Please refer to again Figure 5 , the opening of the optical through-hole 553 is less than 20% of the total area of the surface of the transmissive and reflective element 53 close to the light source module 1. For example, the opening size of the optical through-hole 553 may account for 10% of the total area of the surface of the transmissive and reflective element 53 close to the light source module 1. By setting the optical through-hole 553 with a suitable size, excessive light energy loss can be avoided, and it is beneficial for the light source light L1 incident on the reflective layer 533 to be more fully reflected.

[0097] In this embodiment, the emission direction of the light source light L1 is perpendicular to the diffusion element 3, and the optical through-hole 553 is disposed on the optical path of the light source light L1 so that the light source light L1 can pass through the optical through-hole 553 and enter the diffusion element 3. Please refer to again Figure 7 , in other embodiments, the light source light L1 emitted from the light source module 1 may also have other emission directions, as long as it can pass through the optical through-hole 553 and enter the diffusion element 3 through the focusing lens 51, and the present disclosure does not make any restrictions. By providing the optical through-hole 553 and the reflective layer 533, the light source light L1 emitted from the light source module 1 can be transmitted from the optical through-hole 553 through the focusing lens 51 to the diffusion module, and the light source light L1 reflected back from the diffusion module through the focusing lens 51 to the transmissive and reflective element 53 can be reflected and emitted by the reflective layer 533.

[0098] The optical machine 200 provided by the second embodiment of the present disclosure can effectively increase the diffusion angle by providing the diffusion element 3 for reflecting and diffusing the light source light L1; and then by providing the focusing lens 51 and the reflecting element 55 to converge and reflect the light source light L1 emitted from the diffusion element 3, it is beneficial to greatly reduce the coherence between the light source lights L1, and thus the speckle can be weakened, which is beneficial to improving the display effect of the projection device using the optical machine 200 and ensuring the user's viewing experience.

[0099] Embodiment Three

[0100] Please refer to Figure 10, the difference between the third embodiment and the first embodiment is that the light collecting and reflecting module 5 includes a focusing lens 51, a polarization beam splitter 57, and a phase delay module 59.

[0101] The polarization beam splitter 57 is disposed between the focusing lens 51 and the light source module 1. The light source light L1 includes a sub-light source light L10 having a first polarization direction and a sub-light source light L10 having a second polarization direction. The polarization beam splitter 57 is configured to transmit the sub-light source light L10 having the first polarization direction and reflect the sub-light source light L10 having the second polarization direction. In this embodiment, the first polarization direction is perpendicular to the incident surface of the polarization beam splitter 57, and the second polarization direction is parallel to the incident surface of the polarization beam splitter 57, that is, the sub-light source light L10 having the first polarization direction is p-light, and the sub-light source light L10 having the second polarization direction is s-light; in other embodiments, the sub-light source light L10 having the first polarization direction may also be s-light, and the sub-light source light L10 having the second polarization direction is p-light; specifically determined according to the material properties of the polarization beam splitter 57, and the present disclosure is not limited.

[0102] The phase delay module 59 is disposed between the polarization beam splitter 57 and the focusing lens 51. The phase delay module 59 and the diffusion element 3 are configured to jointly convert the sub-light source light L10 having the first polarization direction into the sub-light source light L10 having the second polarization direction.

[0103] In this embodiment, the phase delay module 59 includes a quarter-wave plate 591. The quarter-wave plate 591 is disposed between the polarization beam splitter 57 and the focusing lens 51. The quarter-wave plate 591 is configured to cause the emitted light source light L1 to emerge after a phase delay of an odd multiple of

[0104] Specifically, the optical axis o of the quarter-wave plate 591 forms an angle of 45° with the polarization state. When the sub-light source light L10 having the first polarization direction is incident on the quarter-wave plate 591, the sub-light source light L10 having the first polarization direction becomes a sub-light source light L10 having a circular polarization state. The sub-light source light L10 having a circular polarization state is reflected by the diffusion element 3 to the quarter-wave plate 591. The quarter-wave plate 591 converts the sub-light source light L10 having a circular polarization state into the sub-light source light L10 having the second polarization direction, and the polarization beam splitter 57 then receives and reflects the sub-light source light L10 having the second polarization direction emitted from the quarter-wave plate 591.

[0105] Please refer to Figure 11, in other embodiments, when the light source light L1 includes multiple light rays with different wavelengths, the phase delay module 59 includes multiple phase delay plates 593 with different thicknesses. The multiple light rays with different wavelengths can be emitted sequentially or simultaneously. The phase delay plates 593 with different thicknesses are arranged at the light-emitting positions of the light rays with different wavelengths to receive the light source light L1 of the corresponding wavelength. For example, when the light source light L1 includes red light, green light, and blue light, phase delay plates 593 with different thicknesses are respectively arranged at the light-emitting positions of each light ray, and each phase delay plate 593 with a certain thickness is used to cause the incident light source light L1 to generate an odd multiple of

[0106] Please refer to Figure 10 again. By setting the phase delay module 59 to include multiple phase delay plates 593 with different thicknesses, so that the incident light rays with different wavelengths all generate an odd multiple of

[0107] and then emit after the phase delay, the coherence of the light source light L1 can be further reduced, which is beneficial to obtaining a better polarization conversion effect.

[0108] The optical engine 300 provided in the third embodiment of the present disclosure can effectively increase the diffusion angle by setting the diffusion element 3 for reflecting and diffusing the light source light L1; and then by setting the focusing lens 51 and the polarization beam splitter element 57 to converge and reflect the light source light L1 emitted from the diffusion element 3, it is beneficial to greatly reduce the coherence between the light source lights L1, and thus can play the effect of weakening the speckle, which is beneficial to improving the display effect of the projection device using the optical engine 300 and ensuring the user's viewing experience.

[0108] The present disclosure embodiment also provides a projection device, which includes the optical engine 100 (200, 300) in the above embodiments.

[0109] The above are only the embodiments of the present disclosure, and do not limit the patent scope of the present disclosure accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present disclosure, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present disclosure by the same token.

Claims

1. An optical machine, characterized in that: include: A light source module, used for emitting light from a light source; A diffusion element, disposed on the light-emitting side of the light source module, for reflecting and diffusing the light source light emitted from the light source module; as well as The light collecting and reflecting module is arranged between the light source module and the diffusion element, and is used for converging and reflecting the light source light emitted from the diffusion element.

2. The optical machine according to claim 1, characterized in that: The light collecting and reflecting module is used to transmit the light source light emitted from the light source module to the diffusion element, or the light collecting and reflecting module is used to allow the light source light to pass through and be incident on the diffusion element.

3. The optical machine according to claim 2, characterized in that: The light collecting and reflecting module is provided with a reflecting layer, and the reflecting layer is used to receive and reflect the light source light emitted from the diffusion element.

4. The optical machine according to claim 3, characterized in that: The light-collecting reflective module also includes a first substrate and an anti-reflection layer; the reflective layer covers a side of the first substrate close to the diffusion element, and the first substrate is arranged around or semi-around the anti-reflection layer, and the anti-reflection layer is used to transmit the light source light emitted from the light source module, and the light source light is transmitted from the anti-reflection layer to the diffusion element.

5. The optical machine according to claim 3, characterized in that: The light collecting and reflecting module is provided with a light through hole, and the light through hole is used to transmit the light source light emitted from the light source module.

6. The optical machine according to claim 2, characterized in that: The light collecting and reflecting module is used for transmitting the sub-light source light with a first polarization direction emitted from the light source module, and reflecting the sub-light source light with a second polarization direction.

7. The optical machine according to claim 6, characterized in that: A phase delay module is further provided between the light collecting and reflecting module and the diffusion element. The phase delay module and the diffusion element are used to jointly convert the light source having the first polarization direction into the light source having the second polarization direction.

8. The optical machine according to claim 7, characterized in that: The light source includes a plurality of light beams with different wavelengths, and the phase delay module includes a plurality of phase delay plates with different thicknesses, and the phase delay plates with different thicknesses are used to make the incident light beams with different wavelengths generate The light is emitted after a phase delay of an odd multiple of .

9. The optical machine according to claim 1, characterized in that: The optical machine further includes a driving module, and the driving module is used to drive the diffusion element to move relative to the light source module.

10. The optical machine according to claim 1, characterized in that: The optical machine further includes a light guiding module, which is disposed on the light emitting side of the light collecting and reflecting module, and is used to receive and guide the light source light emitted from the light collecting and reflecting module.

11. The optical machine according to claim 10, characterized in that: The light guiding module also includes a light homogenizing component, a light modulation component and a lens component; The light homogenizing component is arranged on the side of the light collecting and reflecting module emitting the light from the light source, and the light homogenizing component is used to homogenize the light from the light source; the light modulation component is used to receive the light from the light source after homogenization and modulate the light from the light source into image light; the lens component is used to receive the image light and project the image light out.

12. A projection device, characterized in that: include: An optical machine according to any one of claims 1 to 11.

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