Light source device and optical machine
By setting up multiple laser module groups in the laser projection device to emit sub-light light with different polarization directions, combining light to form light source light, solving the speckle problem of laser projection device, improving the display effect and reducing costs.
Patent Information
- Application Number
- CN202421715574.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-07-18
AI Technical Summary
Existing laser projection devices have speckle problems when projecting images, and the use of expensive optical components to reduce speckle increases equipment costs.
At least two laser module groups are adopted, each of which emits sub-light light with the same polarization direction. Multiple beams of sub-light light photosynthesis light form light with the light source light, so that the polarization directions are different from each other, so as to destroy the coherence between sub-light light and thereby reduce speckle.
Effectively reduce speckle, improve the display effect of projection equipment, and avoid the use of expensive optical components, reducing the overall cost of the equipment.
Smart Images
Figure CN223244962U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of optical technology, and in particular to a light source device and an optical machine including the light source device. Background Art
[0002] Current laser projection systems still suffer from speckle issues. Due to the high energy density of lasers, optical components that can withstand high-energy-density light are often required to reduce speckle. However, these optical components are often expensive, significantly increasing the overall cost of laser projection systems. Utility Model Content
[0003] The present application discloses a light source device and an optical machine, which can reduce speckle while reducing overall costs.
[0004] In a first aspect, the present application relates to a light source device, comprising:
[0005] At least two laser module groups, each laser module group comprising at least one laser module, the laser modules in the same laser module group being configured to emit sub-light sources having the same polarization direction;
[0006] Wherein, a plurality of beams of sub-light source photosynthesize to form light source light, and polarization directions of the sub-light source lights emitted by at least two laser module groups are different from each other.
[0007] The light source device provided in the embodiment of the present application is configured to emit sub-light source lights with different polarization directions by arranging at least two laser module groups, and then combining multiple beams of sub-light source lights to form light source light. The combined light source light includes at least two beams of sub-light source lights with different polarization directions, thereby destroying the coherence between the sub-light source lights, thereby reducing speckle and facilitating improving the display effect of a projection device using the light source device. At the same time, since the light source device provided in the embodiment of the present application does not require the use of additional expensive optical elements to reduce speckle, it is also beneficial to reduce the overall cost of the projection device using the light source device.
[0008] In one embodiment, the light source device includes a light combining component and a first laser module group and a second laser module group;
[0009] The first laser module group includes at least one first laser module, the first laser module is used to emit a first sub-light source light along the first direction, and the first sub-light source light has a first polarization direction;
[0010] The second laser module group includes at least one second laser module, the second laser module is used to emit a second sub-light source light along a second direction, the second sub-light source light has a second polarization direction; the second polarization direction is perpendicular to the first polarization direction, and the first direction is perpendicular to the second direction;
[0011] The light combining component is used to combine the light of the first sub-light source and the light of the second sub-light source into the light source light.
[0012] In one embodiment, the light combining component includes a polarization beam splitting element;
[0013] The polarization splitter is arranged on the optical path of the first sub-light source and the second sub-light source; the polarization splitter is used to reflect the first sub-light source and transmit the second sub-light source, thereby combining the first sub-light source and the second sub-light source into the light source light.
[0014] In one embodiment, the light combining assembly includes a reflective element;
[0015] The reflective element is disposed on the optical path of the second sub-light source; the reflective element is used to reflect the second sub-light source, thereby combining the first sub-light source and the second sub-light source into the light source light.
[0016] In one embodiment, each of the laser module groups emits the sub-light source light in the same direction.
[0017] In one embodiment, the plurality of laser modules in the light source device are of the same model, and an angle is formed between the laser modules in any one laser module group and the laser modules in any adjacent laser module group.
[0018] In one embodiment, the number of the laser module groups is two, and the included angle of the polarization directions of the sub-light sources emitted by the two laser module groups is in the range of 80°-100°.
[0019] In one embodiment, the number of the laser module groups is N, and the angle range of the polarization directions of the sub-light sources emitted by adjacent laser module groups is (360 / N-10°)-(360 / N+10°), where N is greater than or equal to 3.
[0020] In one embodiment, the sub-light source light emitted by each laser module includes a plurality of light beams with different wavelengths.
[0021] In one embodiment, the light energy difference between the sub-light source light emitted by each of the laser module groups and the sub-light source light emitted by any of the laser module groups does not exceed 10%.
[0022] In a second aspect, the present application also relates to an optical machine, comprising:
[0023] The light source device as described in any of the above embodiments, wherein the light source device is used to emit the light source light, and the light source light includes at least two beams of sub-light source light with different polarization directions; and
[0024] The light guiding module is used to guide the light from the light source and homogenize the light from the light source.
[0025] The optical machine provided in the embodiments of the present application, by providing the light source device described in any of the above examples, can emit light source light including at least two beams of sub-light source light with different polarization directions, thereby destroying the coherence between the sub-light source lights, and further reducing speckle, which is beneficial to improving the display effect of the projection device using the optical machine; at the same time, since the optical machine provided in the embodiments of the present application does not require the use of expensive optical elements to reduce speckle, it is also beneficial to reduce the overall cost of the projection device using the optical machine. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0027] Figure 1 It is a structural schematic diagram of the light source device in Example 1 provided in this application.
[0028] Figure 2 This is a structural diagram of the case where each laser module group includes multiple laser modules in the first embodiment provided by the present application.
[0029] Figure 3 Schematic diagram of the structure of the laser module in the embodiment provided in this application.
[0030] Figure 4 It is a structural diagram of the light source device in Example 2 provided in this application.
[0031] Figure 5 It is a structural diagram of the light source device in Example 3 provided in this application.
[0032] Figure 6 yes Figure 5 Schematic diagram of the top view of the central light source device.
[0033] Figure 7 This is a schematic top view of the structure when each laser module group includes multiple laser modules in Example 3 provided by the present application.
[0034] Figure 8 It is a schematic diagram of a top view of the structure of N laser module groups in the third embodiment provided by the present application.
[0035] Figure 9 It is a schematic diagram of an optical machine in an embodiment provided in this application.
[0036] Description of main component symbols
[0037] Light source devices 100 , 200 , 300
[0038] Laser module set 1
[0039] First laser module group 1a
[0040] Second laser module group 1b
[0041] Third laser module group 1c
[0042] Fourth laser module group 1d
[0043] Laser module 11
[0044] First laser module 11a
[0045] Second laser module 11b
[0046] Third laser module 11c
[0047] Fourth laser module 11d
[0048] Laser 111
[0049] First laser 111a
[0050] Second laser 111b
[0051] Lamp beads 112a, 112b, 112c
[0052] Light combining component 3
[0053] Polarization splitting element 31
[0054] Reflective element 35
[0055] Light source L1
[0056] Sub-light source L10
[0057] The first sub-light source light L11
[0058] First polarization direction P1
[0059] The second sub-light source light L12
[0060] Second polarization direction P2
[0061] The third sub-light source light L13
[0062] The third polarization direction P3
[0063] The fourth sub-light source light L14
[0064] Fourth polarization direction P4
[0065] Polarization direction Pn
[0066] First direction X
[0067] Second direction Y
[0068] Optical Engine 700
[0069] Light guide module 71
[0070] Optical modulation chip 73
[0071] Lens module 75 DETAILED DESCRIPTION
[0072] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0073] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly attached to the other component or there may be a central component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be a central component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.
[0074] 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 or interdependence of the functions performed by these devices, modules or units.
[0075] The names of the messages or information exchanged between multiple devices in the embodiments of the present application are only used for illustrative purposes and are not used to limit the scope of these messages or information.
[0076] Images projected by laser projectors are prone to speckle. One solution is to install a half-wave plate at the light output of each laser module in the projector. This allows the emitted laser light to have different polarization directions, thereby reducing the coherence between the lasers and, in turn, reducing speckle. However, due to the high energy density of lasers, a half-wave plate that can withstand high-energy-density light is required. Such half-wave plates are often expensive, so using this structure to eliminate speckle can easily increase the overall cost of the laser projector.
[0077] The light source device of an embodiment of the present application includes at least two laser module groups, each laser module group including at least one laser module, and the laser modules in the same laser module group are configured to emit sub-light source light with the same polarization direction. The light source light is formed by combining multiple sub-light source beams, and the polarization directions of the sub-light source light emitted by at least two laser module groups are different.
[0078] Example 1
[0079] See also Figure 1 The light source device 100 provided in the first embodiment of the present application includes a light combining component 3 and a first laser module group 1a and a second laser module group 1b having different light emitting directions.
[0080] The first laser module group 1a includes a first laser module 11a, which is configured to emit a first sub-light source light L11 along a first direction X. Specifically, the first sub-light source light L11 is linearly polarized and has a first polarization direction P1.
[0081] The second laser module group 1b includes a second laser module 11b, which is configured to emit a second sub-light source light L12 along a second direction Y. The first direction X is perpendicular to the second direction Y. The second sub-light source light L12 is linearly polarized and has a second polarization direction P2.
[0082] See also Figure 2 In other embodiments, the first laser module group 1a may include two first laser modules 11a or more first laser modules 11a. All the first laser modules 11a of the first laser module group 1a are used to emit sub-light sources with the same polarization direction. The number of first laser modules 11a in the first laser module group 1a is determined according to usage requirements and is not limited in this application.
[0083] The second laser module group 1b may include two or more second laser modules 11b, all of which are configured to emit sub-light source light L10 with the same polarization direction. The number of first laser modules 11a in the first laser module group 1a and the number of second laser modules 11b in the second laser module group 1b may be the same or different. The difference in optical energy between the first sub-light source light L11 emitted by the first laser module group 1a and the second sub-light source light L12 emitted by the second laser module group 1b is sufficient as long as it is set to no more than 10%. This is determined based on actual usage requirements and is not a limitation of this application.
[0084] Please refer to Figure 1 The polarization directions of the sub-light source L1 emitted by the first laser module group 1a and the second laser module group 1b are different, that is, the first polarization direction P1 is different from the second polarization direction P2. The first polarization direction P1 is perpendicular to the first direction X and parallel to the second direction Y; the second polarization direction P2 is perpendicular to the paper surface and perpendicular to the first direction X and the second direction Y. Therefore, in this embodiment, the first polarization direction P1 is perpendicular to the second polarization direction P2. In other embodiments, the first polarization direction P1 and the second polarization direction P2 can also be other directions, as long as they are perpendicular to the emission directions of the first sub-light source L11 and the second sub-light source L12, respectively. This application does not limit this.
[0085] The light combining component 3 is used to combine the first sub-light source L11 and the second sub-light source L12 into the light source light L1. Specifically, in this embodiment, the light combining component 3 is a polarization beam splitter 31. The polarization beam splitter 31 is disposed in the optical path of the first sub-light source L11 and the second sub-light source L12. Because the first sub-light source L11 and the second sub-light source L12 have different polarization directions, the polarization beam splitter 31 can be used to reflect the first sub-light source L11 and transmit the second sub-light source L12, thereby combining the first sub-light source L11 and the second sub-light source L12 into the light source light L1.
[0086] By providing a polarization beam splitter 31 to combine the first and second sub-light source lights L11, L12, having different polarization directions, into light source light L1, coherence can be reduced, thereby reducing speckle. Compared to using expensive wave plates and reflectors to combine sub-light source lights L10 into light source light L1, this can reduce costs, thereby helping to reduce the overall cost of projection equipment using light source device 100.
[0087] Please also refer to Figure 1 and Figure 3In this embodiment, the multiple laser modules 11 in the light source device 100 are of the same model. In other embodiments, the laser modules 11 in the light source device 100 may also be of different models, which is determined according to market demand and is not limited by this application.
[0088] Specifically, each laser module 11 includes two lasers 111, namely a first laser 111a and a second laser 111b. The first laser 111a includes four lamp beads 112a, each of which is used to emit red light, and the second laser 111b also includes four lamp beads 112, of which two lamp beads 112b are used to emit green light, and the other lamp beads 112d are used to emit blue light, so that the sub-light source light L10 emitted from each laser module 11 includes a variety of light with different wavelengths. In other embodiments, each laser module 11 may also include three or more lasers 111, and each laser 111 may be provided with multiple lamp beads 112 for emitting light with a single wavelength or multiple wavelengths, which is determined according to the specific use requirements and is not limited by this application.
[0089] The light source device 100 provided in the first embodiment of the present application sets the light-emitting direction of the first sub-light source light L11 emitted by the first laser module group 1a to be perpendicular to the light-emitting direction of the second sub-light source light L12 emitted by the second laser module group 1b, so that the second polarization direction P2 is perpendicular to the first polarization direction P1, and then the first sub-light source light L11 and the second sub-light source light L12 are combined into the light source light L1 through the light combining component 33, so that the light source light L1 after combination includes at least two beams of sub-light source light L10 with different polarization directions, thereby destroying the coherence between the sub-light source light L10, and further reducing the speckle effect, which is beneficial to improving the display effect of the projection device using the light source device 100; at the same time, since the light source device 100 provided in the embodiment of the present application does not need to use expensive optical elements to reduce speckle, it is also beneficial to reduce the overall cost of the projection device using the light source device 100.
[0090] Example 2
[0091] See also Figure 4 The difference between this second embodiment and the first embodiment is that the light combining component 3 comprises a reflective element 35. The reflective element 35 is disposed in the optical path of the second sub-light source light L12; the reflective element 35 is configured to reflect the second sub-light source light L12, thereby combining the first sub-light source light L11 and the second sub-light source light L12 into the light source light L1. By providing the reflective element 35, the first sub-light source light L11 and the second sub-light source light L12, which have different polarization directions, are combined into the light source light L1, thereby destroying the coherence between the sub-light source lights L10 and reducing speckle.
[0092] In this embodiment, the reflective element 35 is a reflective mirror, such as a metal film reflective mirror or a dielectric film reflective mirror. In other embodiments, the reflective element 35 may also be an optical element coated with a reflective film layer, or other optical element capable of reflecting light, depending on the specific application requirements and is not limited in this application.
[0093] The light source device 200 provided in the second embodiment of the present application sets the light-emitting direction of the first sub-light source light L11 emitted by the first laser module group 1a to be perpendicular to the light-emitting direction of the second sub-light source light L12 emitted by the second laser module group 1b, so that the second polarization direction P2 is perpendicular to the first polarization direction P1, and then the second sub-light source light L12 is reflected by the reflecting element 35 to combine the first sub-light source light L11 and the second sub-light source light L12 into the light source light L1, so that the combined light source light L1 includes at least two beams of sub-light source light L10 with different polarization directions, thereby destroying the coherence between the sub-light source lights L10, and further having the effect of reducing speckle.
[0094] Example 3
[0095] Please also refer to Figure 5 and Figure 6 In the light source device 300 provided in the third embodiment of the present application, there are two laser module groups 1, namely the third laser module group 1c and the fourth laser module group 1d. Each laser module group 1 emits sub-light source light L10 in the same direction. The laser modules 11 of the same laser module group 1 are used to emit sub-light source light L10 with the same polarization direction. There is an angle between the laser module 11 in any laser module group 1 and the laser module 11 in any adjacent laser module group 1. Multiple beams of sub-light source light L10 are combined to form light source light L1. The third laser module group 1c includes a third laser module 11c. The third laser module group 1c is used to emit a third sub-light source light L13, the third sub-light source light L13 is in a linear polarization state, and the third sub-light source light L13 has a third polarization direction P3.
[0096] The fourth laser module group 1d also includes a fourth laser module 11d, which is configured to emit fourth sub-light source light L14. This fourth sub-light source light L14 is linearly polarized and has a fourth polarization direction P4. The fourth laser module 11d and the third laser module 11c emit sub-light source light L10 in the same direction.
[0097] See also Figure 7In other embodiments, the third laser module group 1c may include two third laser modules 11c or more third laser modules 11c, and all the third laser modules 11c of the third laser module group 1c are used to emit sub-light source light L10 with the same polarization direction. The number of third laser modules 11c in the third laser module group 1c is determined according to usage requirements and is not limited in this application.
[0098] In other embodiments, the fourth laser module group 1d may include two or more fourth laser modules 11d, and all fourth laser modules 11d in the fourth laser module group 1d are configured to emit sub-light source light L10 having the same polarization direction. When the number of laser modules 11 in both the third laser module group 1c and the fourth laser module group 1d is multiple, an angle is defined between the third laser module 11c in any third laser module group 1c and the fourth laser module 11d in any fourth laser module group 1d.
[0099] The number of third laser modules 11c in the third laser module group 1c and the number of fourth laser modules 11d in the fourth laser module group 1d can be the same or different, as long as the light energy difference between the sub-light source light L10 emitted by the third laser module 11c and the sub-light source light L10 emitted by the fourth laser module 11d is set to no more than 10%. The specific decision is based on usage requirements and is not limited in this application.
[0100] Please refer to Figure 5 and Figure 6 The angle between the third polarization direction P3 and the fourth polarization direction P4 is in the range of 80°-100°. Specifically, the angle between the polarization directions of the sub-light source light L10 emitted by the two laser module groups 1 can be any value within the range of 80°-85°, 85°-90°, 90°-95°, or 95°-100°. By changing the angle between the third laser module 11c in the third laser module group 1c and the fourth laser module 11d in the fourth laser module group 1d, that is, changing the relative position of the third laser module 11c and the fourth laser module 11d, the angle between the third polarization direction P3 and the fourth polarization direction P4 can be changed. For example, by setting the angle between the third laser module group 1c and the laser module 11 of the fourth laser module group 1d to 90°, the angle between the polarization directions of the sub-light source light L10 emitted by the third laser module group 1c and the fourth laser module group 1d can be 90°, that is, the angle between the third polarization direction P3 and the fourth polarization direction P4 is 90°.
[0101] See also Figure 8In other embodiments, the number of laser module groups 1 is N, and the included angle of the polarization directions Pn of the sub-light source lights L10 emitted by adjacent laser module groups 1 is in the range of (360 / N-10°)-(360 / N+10°), where N is greater than or equal to 3. For example, when N is equal to 3, the light source device 300 includes three laser module groups 1, and the included angle of the polarization directions Pn of the sub-light source lights L10 emitted by adjacent laser module groups 1 is in the range of 110°-130°. Specifically, the included angle of the polarization directions Pn of the sub-light source lights L10 emitted by adjacent laser module groups 1 can be any value in the range of 110°-115°, 115°-120°, 120°-125°, or 125°-130°.
[0102] The light source device 300 provided in the third embodiment of the present application is configured to change the angle of the polarization direction of the sub-light source light L10 emitted by the adjacent laser module groups 1 by configuring each laser module group 1 to emit sub-light source light L10 in the same direction, and configuring the laser module 11 in any laser module group 1 to have an angle with the laser module 11 in any adjacent laser module group 1, so that the combined light source light L1 includes at least two beams of sub-light source light L10 with different polarization directions, thereby destroying the coherence between the sub-light source light L10, and further reducing the speckle.
[0103] See also Figure 9 The optical engine 700 provided in the embodiments of the present application includes the light source device 100, 200, or 300 of any of the above embodiments and a light guiding module 71. The light source device 100, 200, or 300 is configured to emit source light (not shown), which includes at least two sub-source light beams with different polarization directions (not shown). The light guiding module 71 is configured to guide the source light and homogenize the source light.
[0104] The optical engine 700 may further include an optical modulation chip 73 and a lens module 75. The optical modulation chip 73 is configured to receive the light source light L1 homogenized by the light guide module 71 and modulate the light source light L1 into image light. The lens module 75 is configured to receive the image light and project the image light. The specific components of the optical engine 700 are determined by the application requirements and are not limited in this application.
[0105] The optical machine 700 provided in the embodiment of the present application can emit light source light including at least two beams of sub-light source light with different polarization directions by setting the light source device 100, 200, 300 in any of the above examples, thereby destroying the coherence between the sub-light source lights, and can more effectively alleviate the speckle caused by the mutual interference between the sub-light source lights, thereby having the effect of reducing speckle, which is beneficial to improving the display effect of the projection device using the light source device 100, 200, 300, and is also beneficial to reducing the overall cost of the projection device using the light source device 100, 200, 300.
[0106] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A light source device, characterized in that: include: At least two laser module groups, each laser module group comprising at least one laser module, the laser modules in the same laser module group being configured to emit sub-light sources having the same polarization direction; Wherein, a plurality of beams of sub-light source photosynthesize to form light source light, and polarization directions of the sub-light source lights emitted by at least two laser module groups are different from each other.
2. The light source device according to claim 1, wherein The light source device includes a light combining component and a first laser module group and a second laser module group; The first laser module group includes at least one first laser module, the first laser module is used to emit a first sub-light source light along a first direction, and the first sub-light source light has a first polarization direction; The second laser module group includes at least one second laser module, the second laser module is used to emit a second sub-light source light along a second direction, the second sub-light source light has a second polarization direction; the second polarization direction is perpendicular to the first polarization direction, and the first direction is perpendicular to the second direction; The light combining component is used to combine the light of the first sub-light source and the light of the second sub-light source into the light source light.
3. The light source device according to claim 2, wherein: The light combining component includes a polarization beam splitting element; The polarization splitter is arranged on the optical path of the first sub-light source and the second sub-light source; the polarization splitter is used to reflect the first sub-light source and transmit the second sub-light source, thereby combining the first sub-light source and the second sub-light source into the light source light.
4. The light source device according to claim 2, wherein The light combining assembly includes a reflective element; The reflective element is disposed on the optical path of the second sub-light source; the reflective element is used to reflect the second sub-light source, thereby combining the first sub-light source and the second sub-light source into the light source light.
5. The light source device according to claim 1, wherein Each of the laser module groups emits the sub-light source light in the same direction.
6. The light source device according to claim 5, characterized in that The plurality of laser modules in the light source device are of the same model, and an angle is formed between the laser modules in any one laser module group and the laser modules in any adjacent laser module group.
7. The light source device according to claim 5, wherein: There are two laser module groups, and the included angle of the polarization directions of the sub-light source lights emitted by the two laser module groups is in the range of 80°-100°.
8. The light source device according to claim 5, wherein The number of the laser module groups is N, and the included angle of the polarization directions of the sub-light sources emitted by adjacent laser module groups is in the range of (360 / N-10°)-(360 / N+10°), where N is greater than or equal to 3.
9. The light source device according to claim 1, wherein The sub-light source light emitted by each laser module includes a plurality of light beams with different wavelengths.
10. The light source device according to claim 1, wherein The light energy difference between the sub-light source light emitted by each laser module group and the sub-light source light emitted by any laser module group does not exceed 10%.
11. An optical machine, characterized in that: include: The light source device according to any one of claims 1 to 10, wherein the light source device is used to emit the light source light, and the light source light includes at least two beams of the sub-light source light with different polarization directions; as well as The light guiding module is used to guide the light from the light source and homogenize the light from the light source.