CN111812856A - Three-primary-color laser speckle-dissipating device and micro-projection display system - Google Patents
Three-primary-color laser speckle-dissipating device and micro-projection display system Download PDFInfo
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- G—PHYSICS
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
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Abstract
The application discloses three primary colors laser speckle elimination device and little projection display system, it carries out the primary speckle elimination to laser beam through setting up static speckle elimination module, and carries out the secondary speckle elimination to laser beam through setting up galvanometer formula speckle elimination module again for the speckle elimination effect is more excellent. The single chip microcomputer is arranged in the galvanometer type speckle eliminating module and can control the vibrating piece to drive the speckle eliminating device to vibrate according to a preset vibration direction and vibration frequency, and the higher the vibration frequency is, the higher the number of the three-primary-color independent laser beams is, so that the space coherence and the time coherence of the laser light source are reduced, and the purpose of eliminating speckles is achieved. In addition, the vibration piece is controlled to enable the speckle elimination device to vibrate in a preset motion track, the utilization rate of the speckle elimination device can be improved, the number of laser beams penetrating through the speckle elimination device is increased, and the better speckle elimination effect is achieved.
Description
Technical Field
The application relates to the technical field of laser display, in particular to a device for laser speckle elimination and a micro-projection display system adopting the device.
Background
In recent years, laser display technology has been widely used in various fields because of its advantages such as high brightness, wide color gamut, high color reproducibility, long life, energy saving, and environmental protection. The development of laser light sources in the field of projection display technology is receiving more and more attention from the outside. In the traditional micro-projection display field, the current projection light source is mainly an LED light source, and is widely applied due to low cost and small volume; in some special micro-projection displays, such as 4K, 8K and ultra-high definition displays, because the spectrum of the LED light source is wide, the display color gamut is generally about 85% NTSC-100% NTSC, and cannot meet the requirements of the special micro-projection displays, while the laser light source has the advantages of high brightness, wide color gamut, high color reduction degree, and the like, especially the display color gamut can reach 160% NTSC, or even higher, which just makes up for the deficiency of the display color gamut of the LED light source, but because the laser light source has good coherence, it is easy to generate speckles and background stripes, and how to effectively eliminate and weaken the laser speckle phenomenon becomes a problem which is urgently needed to be solved at present.
At present, in the prior art, an electromagnetic vibration device is adopted to drive an optical fiber bundle to generate random vibration to eliminate and weaken laser speckles, a vibration projection screen is also adopted to eliminate and weaken laser speckles, a multi-wavelength light source scheme is also adopted to reduce the coherence of a laser light source to eliminate and weaken laser speckles, and a special diffraction optical device is also adopted to eliminate and weaken laser speckles. However, the above-mentioned speckle-eliminating methods cannot achieve the desired speckle-eliminating effect.
Disclosure of Invention
The application provides a three-primary-color laser speckle-eliminating device and a micro-projection display system, which are used for solving the technical problem of eliminating laser speckles in the prior art.
In view of this, a first aspect of the present application provides a three-primary-color laser speckle-dissipating device, which is sequentially provided with a laser light source module, a beam combining module, a static speckle-dissipating module, and a galvanometer speckle-dissipating module along a light path;
the laser light source module is used for emitting laser beams with three different primary colors;
the beam combining module is used for combining laser beams with three different primary colors emitted by the laser light source module;
the static spot dissipation module is used for conducting spot dissipation treatment on the laser beam combined by the beam combining module;
the galvanometer type speckle dissipation module comprises a speckle dissipation device, a vibrating piece and a single chip microcomputer;
the speckle eliminating device is used for receiving the laser beam after speckle eliminating processing by the static speckle eliminating module;
the speckle eliminating device is fixed on the vibrating piece, and the vibrating piece is used for driving the speckle eliminating device to vibrate;
the single chip microcomputer is electrically connected with the vibrating piece and is used for controlling the vibrating piece to vibrate according to a preset vibration direction and a preset vibration frequency.
Preferably, the laser light source module comprises a first laser light source module and a second laser light source module;
the first laser light source module comprises a red laser light source R1, a blue laser light source B1 and a green laser light source G1, the second laser light source module comprises a red laser light source R2, a blue laser light source B2 and a green laser light source G2, and the central wavelengths of the laser light sources of the corresponding primary colors between the first laser light source module and the second laser light source module are different;
the beam combination module comprises a first dichroic mirror module and a second dichroic mirror module, the first dichroic mirror module is used for combining laser beams of the red laser light source R1, the blue laser light source B1 and the green laser light source G1, and the second dichroic mirror module is used for combining laser beams of the red laser light source R2, the blue laser light source B2 and the green laser light source G2.
Preferably, the laser light source module includes a red laser light source R, a blue laser light source B, and a green laser light source G, and the beam combining module is an X-cube color combining prism, and is configured to combine laser beams of the red laser light source R, the blue laser light source B, and the green laser light source G.
Preferably, a reflector is arranged on a light path between the beam combining module and the static spot-dissipating module, and the reflector is used for receiving and reflecting the laser beam emitted by the beam combining module and limiting the laser beam to vertically enter the static spot-dissipating module.
Preferably, a field lens is arranged on a light path of the light emitting side of the galvanometer type speckle dissipation module and is used for performing dodging processing on the laser beam emitted by the galvanometer type speckle dissipation module.
Preferably, a first fly-eye lens and a first fly-eye coupling lens are sequentially arranged on a light path between the static speckle eliminating module and the galvanometer speckle eliminating module, and a second fly-eye coupling lens are sequentially arranged on a light path between the galvanometer speckle eliminating module and the field lens;
the surfaces, close to each other, of the first fly-eye lens and the second fly-eye lens are both planes, and the surfaces, far away from each other, of the first fly-eye lens and the second fly-eye lens are both convex spherical surfaces;
and the two surfaces of the first fly-eye coupling lens and the second fly-eye coupling lens are both convex spherical surfaces.
Preferably, a fly-eye coupling lens is arranged on a light path between the static speckle eliminating module and the galvanometer type speckle eliminating module, and both surfaces of the fly-eye coupling lens are convex spherical surfaces;
a fly-eye lens is arranged on a light path between the galvanometer type speckle-dissipating module and the field lens, and both surfaces of the fly-eye lens are convex spherical surfaces.
Preferably, the vibrating piece adopts a galvanometer motor, and the speckle dispersing device is a diffusion sheet, ground glass or a phase sheet.
Preferably, the static speckle-dissipating module is a diffuser, ground glass, phase plate or depolarizer.
On the other hand, the embodiment of the application also provides a micro-projection display system, which applies the three-primary-color laser speckle eliminating device and comprises the three-primary-color laser speckle eliminating device, an RTIR prism, a DMD, a projection lens and a projection screen;
the RTIR prism is used for receiving the laser beams emitted by the three-primary-color laser speckle-eliminating device, enabling the laser beams to be emitted into the DMD, receiving the projection beams output by the DMD, and emitting the projection beams into the projection lens after the light path conversion is carried out on the projection beams;
and the projection screen is used for receiving the projection light beam emitted by the projection lens.
According to the technical scheme, the embodiment of the application has the following advantages:
the embodiment of the application provides a tricolor laser speckle elimination device, which is used for eliminating speckles of a laser beam for the first time by arranging a static speckle elimination module and eliminating speckles of the laser beam for the second time by arranging a galvanometer type speckle elimination module, so that the speckle elimination effect is better. And through setting up the singlechip and can drive the speckle elimination device through controlling the vibrating piece and vibrate according to predetermined vibration direction and vibration frequency in the galvanometer formula speckle elimination module for the vibration state is controllable, and vibration frequency is higher, has just also increased the number of the independent laser beam of three primary colors in other words, thereby reaches and reduces laser source spatial coherence and time coherence, and then reaches the purpose that disappears the speckle, simultaneously, sets up reasonable vibration frequency and makes the structure can not destroyed. In addition, the vibration piece is controlled to enable the speckle elimination device to vibrate in a preset motion track, so that the reliability of the structure can be improved, the utilization rate of the speckle elimination device can be improved, the number of laser beams penetrating through the speckle elimination device is increased, and the better speckle elimination effect is achieved.
The micro-projection display system provided by the embodiment of the application has the technical effect that the speckle eliminating effect of the projection light beam is improved.
Drawings
Fig. 1 is a first structural schematic diagram of a three-primary-color laser speckle-eliminating device and a micro-projection display system according to an embodiment of the present disclosure;
fig. 2 is a second structural schematic diagram of a three-primary-color laser speckle-eliminating device and a micro-projection display system according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a three-primary-color laser speckle-eliminating device and a micro-projection display system according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a galvanometer speckle reduction module in a three-primary-color laser speckle reduction device according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
For easy understanding, please refer to fig. 1, a first embodiment of the present application provides a three-primary-color laser speckle-eliminating device, which is sequentially provided with a laser light source module, a beam combining module, a static speckle-eliminating module 4, and a galvanometer speckle-eliminating module 7 along a light path;
the laser light source module is used for emitting laser beams with three different primary colors;
the beam combining module is used for combining laser beams with three different primary colors emitted by the laser light source module;
the static speckle eliminating module 4 is used for carrying out speckle eliminating treatment on the laser beam after the beam combination module is used for combining the beams;
referring to fig. 4, the galvanometer speckle eliminating module 7 includes a speckle eliminating device 70, a vibrating piece 71 and a single chip microcomputer;
the speckle eliminating device 70 is used for receiving the laser beam after the speckle eliminating module 4 eliminates the speckle processing;
the speckle eliminating device 70 is fixed on the vibrating piece 71, and the vibrating piece 71 is used for driving the speckle eliminating device 70 to vibrate;
the single chip microcomputer is electrically connected with the vibrating piece 71 and is used for controlling the vibrating piece 71 to vibrate according to a preset vibration direction and a preset vibration frequency.
It should be noted that the single chip microcomputer in this embodiment is a program-editable single chip microcomputer, and the single chip microcomputer may be electrically connected to the vibrating member 71 through the electrical connection device 72, and the electrical connection device 72 may adopt a USB, a serial port, or the like.
It can be understood that, in the first embodiment, the static speckle eliminating module 4 firstly eliminates the speckle of the laser beam for the first time, and the galvanometer speckle eliminating module 7 secondly eliminates the speckle of the laser beam, so that the speckle eliminating effect is better. In order to achieve a better speckle eliminating effect, the higher the vibration frequency is, the more the number of the three-primary-color independent laser beams is increased, so that the space coherence and the time coherence of the laser light source are reduced, and the purpose of eliminating speckles is achieved. The vibrating mirror type speckle eliminating module 7 is provided with a single chip microcomputer, and the single chip microcomputer can drive the speckle eliminating device 70 to vibrate according to a preset vibration direction and a preset vibration frequency through controlling the vibrating piece 71, so that the vibration state is controllable. In the conventional motor vibration, the vibration frequency can only reach about 60HZ due to the structure and physical characteristics, and the galvanometer speckle elimination module 7 in the embodiment can set the vibration frequency to be 100HZ through the single chip microcomputer, even the frequency is higher, so that the speckle elimination effect is better, and meanwhile, the structure cannot be damaged. In addition, the single chip microcomputer can preset the vibration direction of the vibration piece 71 and control the vibration piece 71 to vibrate along a preset motion track, so that the reliability of the structure can be improved, the utilization rate of the speckle elimination device 70 can be improved, the number of laser beams penetrating through the speckle elimination device 70 is increased, and the better speckle elimination effect is achieved.
Example two
In the second embodiment, on the basis of the above embodiments, further referring to fig. 1 or fig. 2, the laser light source module includes a first laser light source module and a second laser light source module;
the first laser light source module comprises a red laser light source R115, a blue laser light source B111 and a green laser light source G113, the second laser light source module comprises a red laser light source R216, a blue laser light source B212 and a green laser light source G214, and the central wavelengths of the laser light sources of the corresponding primary colors between the first laser light source module and the second laser light source module are different;
the beam combination module comprises a first dichroic mirror module and a second dichroic mirror module, the first dichroic mirror module is used for combining laser beams of the red laser light source R115, the blue laser light source B111 and the green laser light source G113, and the second dichroic mirror module is used for combining laser beams of the red laser light source R216, the blue laser light source B212 and the green laser light source G214.
The first dichroic mirror modules include three dichroic mirrors 21, 23, and 25 arranged side by side, and the second dichroic mirror modules include three dichroic mirrors 22, 24, and 26 arranged side by side.
It can be understood that the laser speckle is mainly caused by the coherence of the wavelength, the coherence between the wavelengths can be reduced by the laser with two different wavelengths, and the central wavelengths of the laser light sources of the first laser light source module and the second laser light source module are different, so that the speckle eliminating effect can be improved. And through twice speckle elimination in the first embodiment, three-level speckle elimination of multi-wavelength, static speckle elimination and galvanometer speckle elimination is realized, so that the speckle elimination effect is better.
It should be noted that the difference between the central wavelengths of the laser light sources of the first laser light source module and the second laser light source module is preferably 10nm, and in order to save cost, one group of laser light source modules can be used as the laser light sources, and the other group of laser light sources can be used as the LED light sources, and the effects of controlling the display color gamut of the product and optimizing speckles can be achieved by controlling the ratio of the light output powers of the laser light sources and the LED light sources.
EXAMPLE III
In the third embodiment, referring to fig. 3, the laser light source module includes a red laser light source R19, a blue laser light source B17, and a green laser light source G18, and the beam combining module is an X-cube color combining prism 20 for combining the laser beams of the red laser light source R19, the blue laser light source B17, and the green laser light source G18.
It should be noted that the X-cube color combining prism 20 is a conventional one, and the X-cube color combining prism 20 combines the laser beams emitted by the laser light source module.
Example four
In order to improve the optical path and facilitate a more flexible system structure, on the basis of the first embodiment, a reflecting mirror 3 is further disposed on the optical path between the beam combining module and the static speckle eliminating module 4, and the reflecting mirror 3 is configured to receive and reflect the laser beam emitted by the beam combining module and limit the laser beam to vertically enter the static speckle eliminating module 4.
It should be noted that the reflection surface of the reflection mirror 3 forms an angle of 45 degrees with the laser beam emitted by the beam combining module, and the reflection surface of the reflection mirror 3 also forms an angle of 45 degrees with the laser beam incident on the static speckle eliminating module 4, so that the laser beam incident on the static speckle eliminating module 4 is perpendicular to the incidence surface of the static speckle eliminating module 4.
Further, a field lens 8 is arranged on a light path of the light emitting side of the galvanometer type speckle eliminating module 7 and is used for performing light homogenizing treatment on the laser beam emitted by the galvanometer type speckle eliminating module 7.
It should be noted that the side of the field lens 8 close to the galvanometer speckle reduction module 7 is a plane, and the side of the field lens far from the galvanometer speckle reduction module 7 is a convex spherical surface.
Further, a first fly-eye lens 50 and a first fly-eye coupling lens 60 are sequentially arranged on a light path between the static speckle eliminating module 4 and the galvanometer type speckle eliminating module 7, and a second fly-eye coupling lens 61 and a second fly-eye lens 51 are sequentially arranged on a light path between the galvanometer type speckle eliminating module 7 and the field lens 8;
the surfaces, close to each other, of the first fly-eye lens 50 and the second fly-eye lens 51 are both planes, and the surfaces, far away from each other, of the first fly-eye lens 50 and the second fly-eye lens 51 are both convex spherical surfaces;
both surfaces of the first fly-eye coupling lens 60 and the second fly-eye coupling lens 61 are convex spherical surfaces.
It should be noted that the first fly-eye lens 50, the second fly-eye lens 51, the first fly-eye coupling lens 60, and the second fly-eye coupling lens 61 constitute a fly-eye lens group, and the fly-eye lens group enables the laser beam to enter the first fly-eye lens 50 and then pass through the fly-eye lens group, so that the laser beam is focused on the second fly-eye lens 51, thereby achieving the effect of light uniformization, and the distance between the first fly-eye coupling lens 60 and the second fly-eye coupling lens 61 can adjust the focal length, so that the laser beam can be focused on the second fly-eye lens 51.
In addition, in another embodiment, a fly-eye coupling lens 62 is arranged on a light path between the static speckle eliminating module 4 and the galvanometer type speckle eliminating module 7, and both surfaces of the fly-eye coupling lens 62 are convex spherical surfaces;
a fly-eye lens 52 is arranged on a light path between the galvanometer speckle eliminating module 7 and the field lens 8, and both surfaces of the fly-eye lens 52 are convex spherical surfaces.
In this embodiment, the laser beam is directly focused on the fly-eye lens 52 through the fly-eye coupling lens 62 without using two fly-eye lenses and two fly-eye coupling lenses, so as to homogenize the laser beam.
Further, the vibrating member 71 adopts a galvanometer motor, and the speckle dispersing device 70 is a diffusion sheet, ground glass or a phase plate.
It should be noted that, the galvanometer motor is the prior art, and it adopts electronic magnetism to inhale the mode, can make the vibration frequency higher.
Further, the static speckle eliminating module 4 is a diffusion sheet, ground glass, a phase sheet or a depolarizer.
It should be noted that both the static speckle eliminating module 4 and the speckle eliminating device 70 can be preferably a diffusion sheet, and the diffusion half angle of the diffusion sheet is too small, so that the light uniformizing and speckle eliminating effects are insufficient, and the diffusion half angle is too large, which is also unfavorable for coupling, and causes the compound eye light uniformizing efficiency to be low, so the diffusion half angle of the diffusion sheet in this embodiment is preferably 1-3.5 degrees.
EXAMPLE five
In this embodiment, the three-primary-color laser speckle-eliminating device in the above embodiment is applied, and referring to fig. 1 to fig. 3, a micro-projection display system is provided, which includes a three-primary-color laser speckle-eliminating device, an RTIR prism 9, a DMD90, a projection lens 91, and a projection screen 92;
the RTIR prism 9 is used for receiving the laser beam emitted by the three-primary-color laser speckle-removing device, making the laser beam enter the DMD90, receiving the projection beam output by the DMD90, and making the projection beam enter the projection lens 91 after the light path conversion;
and a projection screen 92 for receiving the projection light beam emitted from the projection lens 91.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A tricolor laser speckle-dissipating device is characterized in that a laser light source module, a beam combining module, a static speckle-dissipating module and a galvanometer type speckle-dissipating module are sequentially arranged along a light path;
the laser light source module is used for emitting laser beams with three different primary colors;
the beam combining module is used for combining laser beams with three different primary colors emitted by the laser light source module;
the static spot dissipation module is used for conducting spot dissipation treatment on the laser beam combined by the beam combining module;
the galvanometer type speckle dissipation module comprises a speckle dissipation device, a vibrating piece and a single chip microcomputer;
the speckle eliminating device is used for receiving the laser beam after speckle eliminating processing by the static speckle eliminating module;
the speckle eliminating device is fixed on the vibrating piece, and the vibrating piece is used for driving the speckle eliminating device to vibrate;
the single chip microcomputer is electrically connected with the vibrating piece and is used for controlling the vibrating piece to vibrate according to a preset vibration direction and a preset vibration frequency.
2. The three-primary-color laser speckle-dissipating device according to claim 1, wherein the laser light source module comprises a first laser light source module and a second laser light source module;
the first laser light source module comprises a red laser light source R1, a blue laser light source B1 and a green laser light source G1, the second laser light source module comprises a red laser light source R2, a blue laser light source B2 and a green laser light source G2, and the central wavelengths of the laser light sources of the corresponding primary colors between the first laser light source module and the second laser light source module are different;
the beam combination module comprises a first dichroic mirror module and a second dichroic mirror module, the first dichroic mirror module is used for combining laser beams of the red laser light source R1, the blue laser light source B1 and the green laser light source G1, and the second dichroic mirror module is used for combining laser beams of the red laser light source R2, the blue laser light source B2 and the green laser light source G2.
3. The three-primary-color laser speckle-dispersing device according to claim 1, wherein the laser light source module comprises a red laser light source R, a blue laser light source B and a green laser light source G, and the beam combining module is an X-cube color combining prism and is used for combining laser beams of the red laser light source R, the blue laser light source B and the green laser light source G.
4. The three-primary-color laser speckle fading device according to claim 1, wherein a reflector is disposed on a light path between the beam combining module and the static speckle fading module, and the reflector is configured to receive and reflect the laser beam emitted from the beam combining module and limit the laser beam from perpendicularly entering the static speckle fading module.
5. The tricolor laser speckle fading device according to claim 1, wherein a field lens is disposed on a light path of the light exit side of the galvanometer speckle fading module, and is used for dodging the laser beam emitted by the galvanometer speckle fading module.
6. The tricolor laser speckle fading device according to claim 5, wherein a first fly-eye lens and a first fly-eye coupling lens are sequentially arranged on a light path between the static speckle fading module and the galvanometer speckle fading module, and a second fly-eye coupling lens are sequentially arranged on a light path between the galvanometer speckle fading module and the field lens;
the surfaces, close to each other, of the first fly-eye lens and the second fly-eye lens are both planes, and the surfaces, far away from each other, of the first fly-eye lens and the second fly-eye lens are both convex spherical surfaces;
and the two surfaces of the first fly-eye coupling lens and the second fly-eye coupling lens are both convex spherical surfaces.
7. The tricolor laser speckle fading device according to claim 5, wherein a fly-eye coupling lens is arranged on a light path between the static speckle fading module and the galvanometer speckle fading module, and both surfaces of the fly-eye coupling lens are convex spherical surfaces;
a fly-eye lens is arranged on a light path between the galvanometer type speckle-dissipating module and the field lens, and both surfaces of the fly-eye lens are convex spherical surfaces.
8. The tricolor laser speckle dissipating device of claim 1, wherein the vibrating element is a galvanometer motor, and the speckle dissipating device is a diffusion sheet, ground glass or a phase sheet.
9. The tricolor laser speckle dissipating device of claim 1, wherein the static speckle dissipating module is a diffuser, ground glass, a phase plate, or a depolarizer.
10. A micro projection display system, which applies the tricolor laser speckle-eliminating device according to any one of claims 1 to 9, and is characterized by comprising the tricolor laser speckle-eliminating device, an RTIR prism, a DMD, a projection lens and a projection screen;
the RTIR prism is used for receiving the laser beams emitted by the three-primary-color laser speckle-eliminating device, enabling the laser beams to be emitted into the DMD, receiving the projection beams output by the DMD, and emitting the projection beams into the projection lens after the light path conversion is carried out on the projection beams;
and the projection screen is used for receiving the projection light beam emitted by the projection lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010724065.6A CN111812856A (en) | 2020-07-24 | 2020-07-24 | Three-primary-color laser speckle-dissipating device and micro-projection display system |
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| CN202010724065.6A CN111812856A (en) | 2020-07-24 | 2020-07-24 | Three-primary-color laser speckle-dissipating device and micro-projection display system |
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| CN202010724065.6A Pending CN111812856A (en) | 2020-07-24 | 2020-07-24 | Three-primary-color laser speckle-dissipating device and micro-projection display system |
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| CN (1) | CN111812856A (en) |
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| CN117389106A (en) * | 2023-12-08 | 2024-01-12 | 宜宾市极米光电有限公司 | Projection light source |
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