CN101750753A - System for eliminating laser speckles and projector using same - Google Patents
System for eliminating laser speckles and projector using same Download PDFInfo
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- CN101750753A CN101750753A CN200810204085A CN200810204085A CN101750753A CN 101750753 A CN101750753 A CN 101750753A CN 200810204085 A CN200810204085 A CN 200810204085A CN 200810204085 A CN200810204085 A CN 200810204085A CN 101750753 A CN101750753 A CN 101750753A
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Abstract
The invention relates to a system for eliminating laser speckles and a projector using the same. The system for eliminating the laser speckles comprises a laser light source, a focusing optical unit and an integrator rod unit which is provided with at least one first integrator rod, and the first integrator rod continuously moves up and down; and the laser light source, the focusing optical unit and the integrator rod unit are arranged successively. The projector eliminating the laser speckles comprises a laser light source, a focusing optical unit, an integrator rod unit, a light spot magnifying lens group, an imaging chip and a projection objective group. The invention has the advantages that compared with the conventional method for eliminating the laser speckles, because the adopted first integrator rod has small size, the processing is convenient, the size is reduced and the processing cost is reduced; the speckles on a projection screen are eliminated after a first integrator rod moving technology is adopted; and a laser display projector using the method has the advantages of small size, high energy utilization, low manufacturing cost and easy purchase of components.
Description
Technical field
The projector that the present invention relates to a kind of system of eliminate laser speckle and use this system.
Background technology
In projection optical system because the monochromaticity of laser is good, excitation is high, by three look composition principles, maximum color triangle zone is arranged on chromatic diagram, thus it have other light source incomparable advantage.But, influencing owing to the coherence is subjected to speckle as the laser beam of light source, the surface that shines rough object can form laser facula, and speckle striped strong on the screen has had a strong impact on image quality, has reduced the resolution and the contrast of image.Therefore, speckle is the principal element that reduces picture quality and resolution, also is one of factor of restriction projector development.
The main method of laser projection eliminate laser speckle in the prior art, the optical fiber of use eliminate laser speckle is arranged, its principle of work is: the optical fiber of certain-length, laser beam after assembling enters optical fiber, and the laser beam of different incidence angles is different with the collision frequency of optical fiber wall, causes the light path difference of light beam, thereby different phase places is arranged in the laser beam of optical fiber exit facet, weakened the coherence of laser, therefore the contrast of laser speckle reduces, and laser speckle reduces the stimulation of human eye.
The method of laser projection eliminate laser speckle in the prior art, use lenticule rotation eliminate laser speckle in addition, its principle of work is: lenticule is converged to several convergent points with the directional light of LASER Light Source, the different corresponding light paths of the lenticular relatively height of the light beam of laser beam are also different, the laser beam of different convergent points enters integrating rod, in like manner the laser beam of exit facet has different phase places, the coherence weakens, rotating lenticule moves the position of laser speckle, eyes synthesize each tiny different speckles, reduce the contrast of speckle.
Projection screen is manufactured serrate, make the beam divergence through screen, change the phase place of light beam, the coherence who destroys imaging beam is the other method of eliminate laser speckle.
The method of laser projection eliminate laser speckle in the prior art, have following shortcoming: the coherent length of laser is from several centimetres to several kilometers, reaching coherent length optical fiber with the light path of optical fiber dissipation spot light beam can be very long, reasons such as absorption owing to material, light intensity can weaken, and the projector equipment volume increases.
The shortcoming of lenticule dissipation spot is: lenticule can not be done infinitely smallly, and a limited number of luminous points make the distribution of speckle sparse, and lenticular rotating speed could be eliminated speckle soon.
Projection screen dissipation spot cost height, domestic can not processing.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes above the deficiencies in the prior art, provides a kind of manufacturing process simple, and cost is low, eliminates effective system of speckle and the projector that uses this system.
For achieving the above object, the present invention adopts following technical scheme:
A kind of system of eliminate laser speckle comprises: LASER Light Source has the laser instrument that at least one is used to send laser beam; The focusing optical unit, the laser beam that is used for LASER Light Source is sent is assembled; The integrating rod unit has at least one first integral rod, and this first integral rod continuously moves up and down; Described LASER Light Source, focusing optical unit, integrating rod unit are arranged in order.Above-mentioned first integral rod travel frequency is more than the 20Hz.Described integrating rod unit also comprises a second integral rod.
A kind of projector of eliminate laser speckle comprises: LASER Light Source has the laser instrument that at least one is used to send laser beam; The focusing optical unit, the laser beam that is used for LASER Light Source is sent is assembled; The integrating rod unit has at least one first integral rod, and this first integral rod continuously moves up and down; Hot spot amplifying lens group has the optical element that at least one is used to amplify hot spot; Imager chip is used for optical system imaging; The projection objective group has at least one and is used for the projection objective of image imaging in screen; Described LASER Light Source, focusing optical unit, integrating rod unit, hot spot amplifying lens group, imager chip and projection objective group are arranged in order.Above-mentioned first integral rod travel frequency is more than the 20Hz.Described integrating rod unit also comprises a second integral rod.Described LASER Light Source is taken from red laser instrument, green laser and blue laser instrument; Described imager chip is taken from lcd imager chip, lcos imager chip and DMD imager chip.
Beneficial effect of the present invention is:
1, compare with traditional eliminate laser speckle method since the first integral barred body that adopted long-pending little, easy to process, reduced volume, reduced processing cost, adopt first integral rod mobile technology rear projection screen to eliminate speckle simultaneously;
2, adopt laser (lcd, lcos, DMD) the Display projector machine of said method, volume is little, capacity usage ratio is high, low cost of manufacture, easy purchase of components..
Description of drawings
Fig. 1 is the structural representation of eliminate laser speckle of the present invention system;
Fig. 2 is the first embodiment synoptic diagram of the present invention projector of using the eliminate laser speckle system;
Fig. 3 is the second embodiment synoptic diagram of the present invention projector of using the eliminate laser speckle system;
Fig. 4 is the 3rd an embodiment synoptic diagram of the present invention projector of using the eliminate laser speckle system.
Embodiment
Now the present invention is further illustrated in conjunction with the accompanying drawings.
Be the structural representation of eliminate laser speckle of the present invention system as shown in Figure 1, it comprises LASER Light Source 10, convergent lens 20, first integral rod 31, second integral rod 32, wherein LASER Light Source 10, convergent lens 20, first integral rod 31, second integral rod 32 is arranged in order.Wherein first integral rod 31 volumes are little, are convenient to processing.
LASER Light Source 10 has at least one laser instrument that sends laser beam, its directional light that sends is focused on the inlet of first integral rod 31 by convergent lens 20, light beam is repeatedly reflection in first integral rod 31,31 outlet laser beam homogenizes of first integral rod and position are mixed and disorderly before comparing and entering, these light enter second integral rod 32, light in second integral rod 32 again through repeatedly reflection, further homogenize, the coherence of light beam is more weak.The area source in first integral rod 31 exits in the system, be equivalent to countless luminous point combinations, light penetrates the second integral rod 32 back countless speckles of formation and is dispersed in equably on the whole illumination hot spot, first integral rod 31 continuously moves up and down, be equivalent to countless little luminous points and constantly change the position, speckle on the corresponding illumination hot spot also just constantly moves (shown in Fig. 1 dotted line), and when the frequency that moves reaches more than the 20Hz, human eye is with the synthetic uniform hot spot of a width of cloth of small light spot.Wherein convergent lens 20 can be replaced by other optical elements sets with convergence function.The integrating rod unit also can include only a first integral rod 31, but in this case, is eliminate laser speckle, and first integral rod 31 usually can be long.
Be the first embodiment synoptic diagram of the present invention projector of using the eliminate laser speckle system as shown in Figure 2, comprise red laser instrument 11, green laser 12, blue laser instrument 13, convergent lens 20, first integral rod 31, second integral rod 32, hot spot amplifying lens group 40, lcd imager chip 51, color-combination prism 60, projection objective 70.Wherein the green glow light path is green laser 12, convergent lens 20, first integral rod 31, second integral rod 32, hot spot amplifying lens group 40, lcd imager chip 51, color-combination prism 60 from left to right successively; Ruddiness light path: be red laser instrument 11, convergent lens 20, first integral rod 31, second integral rod 32, hot spot amplifying lens group 40, lcd imager chip 51, color-combination prism 60 from top to bottom successively; The blue streak light path: be blue laser instrument 13, convergent lens 20, first integral rod 31, second integral rod 32, hot spot amplifying lens group 40, lcd imager chip 51, color-combination prism 60 from bottom to top successively, color-combination prism 60 the right be projection objective 70.Wherein hot spot amplifying lens group 40 has the optical element that at least one is used to amplify hot spot, and in embodiment 1, hot spot amplifying lens group 40 is made up of two convex lens that are arranged in order 41,42.Projection objective 70 can be replaced by other optical elements sets with enlarging function.
The directional light that is sent by red laser instrument 11, green laser 12, blue laser instrument 13 becomes uniform dissipation spot illumination hot spot through the eliminate laser speckle system to 32 outlets of second integral rod as mentioned above, hot spot amplifying lens group 40 with the uniform light spots amplification imaging of second integral rod 32 outlets on lcd imager chip 51, color-combination prism 60 synthesizes piece image with three red green blue image overlay, and projection objective 70 images in screen with composograph.In embodiment 1, the position of red laser instrument 11, green laser 12, blue laser instrument 13 can be changed mutually.
Certainly, in the present invention, also can only adopt a laser instrument as LASER Light Source 10, its laser beam that sends images in screen through convergent lens 20, first integral rod 31, second integral list 32, hot spot amplifying lens group 40, imager chip, projection objective 70, certainly in such cases, because what select for use is mono-colour laser, therefore becoming image also is image corresponding to this laser wavelength.For example, select for use red laser instrument 11 as LASER Light Source, what then present on the screen is red image.
Be the second embodiment synoptic diagram of the present invention projector of using the eliminate laser speckle system as shown in Figure 3, comprise red laser instrument 11, green laser 12, blue laser instrument 13, instead be popular in blue green dichroic mirror 81, anti-blue saturating red green dichroic mirror 82, convergent lens 20, first integral rod 31, second integral rod 32, hot spot amplifying lens group 40, reflective mirror 62, anti-(TIR) prism group 61 fully, DMD imager chip 53, projection objective 70, wherein interior fully anti-(TIR) prism group 61 is arranged on the optical axis exit direction of reflective mirror 62, the left side of DMD imager chip 53 anti-(TIR) prism group 61 in fully, the right of projection objective 70 anti-(TIR) prism group 61 in fully.
Wherein the green glow light path be successively from left to right green laser 12, counter be popular in blue green dichroic mirror 81, anti-blue saturating red green dichroic mirror 82, convergent lens 20, first integral rod 31, second integral rod 32, hot spot amplifying lens group 40, reflective mirror 62, fully in anti-(TIR) prism group 61, DMD imager chip 53, projection objective 70, wherein instead be popular in blue green dichroic mirror 81, anti-blue saturating red green dichroic mirror 82 angles respectively at 45 are provided with.Ruddiness light path and green glow light path are basic identical, and its difference is: red laser instrument 11 is positioned at 45 ° anti-blue green dichroic mirror 81 belows of being popular in; Blue streak light path and green glow light path are basic identical, and its difference is: blue laser instrument 13 is positioned at 45 ° saturating red green dichroic mirror 82 belows of anti-orchid.Wherein anti-blue green dichroic mirror 81, the anti-blue saturating red green dichroic mirror 82 of being popular in also can reversing of position, and corresponding red laser instrument 11 is positioned at 45 ° anti-blue green dichroic mirror 81 belows of being popular in, and blue laser instrument 13 is positioned at 45 ° saturating red green dichroic mirror 82 belows of anti-orchid.In like manner: instead be popular in blue green dichroic mirror 81, anti-blue saturating red green dichroic mirror 82 also can become 135 ° of angles to be provided with respectively, red laser instrument 11 is positioned at 135 ° anti-blue green dichroic mirror 81 tops of being popular in, and blue laser instrument 13 is positioned at 135 ° saturating red green dichroic mirror 82 tops of anti-orchid.
In a second embodiment, also can select anti-green red blue dichroic mirror, anti-blue saturating red green dichroic mirror for use, red laser instrument is positioned at the left side of anti-green red blue dichroic mirror, anti-blue saturating red green dichroic mirror, green laser 12 is positioned at the below of anti-green red blue dichroic mirror, blue laser instrument 13 is positioned at the below of the saturating red green dichroic mirror of anti-orchid, and the position of anti-green red blue dichroic mirror, anti-blue saturating red green dichroic mirror can be changed mutually.Certainly, select for use anti-green red blue dichroic mirror, instead be popular in blue green dichroic mirror and also be fine.Grating has partial reflection part transmission function, also can replace the dichroic mirror in the present embodiment.
When DMD imager chip 53 shows green pattern, the directional light that green laser 12 sends sees through the anti-blue green dichroic mirror 81 that is popular in, anti-blue saturating red green dichroic mirror 82, the aforesaid outlet to second integral rod 32 becomes uniform dissipation spot illumination hot spot, hot spot amplifying lens group 40 is passed through reflective mirror 62, interior fully anti-(TIR) prism group 61 reflection amplification imagings on DMD imager chip 53 with the uniform light spots of second integral rod 32 outlets, DMD imager chip 53 with the light reflected back fully in anti-(TIR) prism group 61, projection objective 70 with image imaging in screen.When DMD imager chip 53 showed red pattern, the directional light that red laser instrument 11 sends was popular in blue green dichroic mirror 81 reflections by counter, sees through anti-blue saturating red green dichroic mirror 82, arrives convergent lens 20.When DMD imager chip 53 showed blue colored pattern, the directional light that blue laser instrument 13 sends arrived convergent lens 20 by saturating red green dichroic mirror 82 reflections of anti-orchid, and blue look, the red image identical with green glow project to screen by projection objective 70 at last.Three red, green, blue images that human eye shows sequential synthesize the image of a width of cloth colour.
Be the 3rd embodiment synoptic diagram of the present invention projector of using the eliminate laser speckle system as shown in Figure 4, comprise red laser instrument 11, green laser 12, blue laser instrument 13, anti-green red dichroic mirror 83, convergent lens 20, first integral rod 31, second integral rod 32, hot spot amplifying lens group 40, lcos imager chip 52, polarization splitting prism 80, color-combination prism 60, projection objective 70,83 one-tenth 135 ° of angles of anti-green red dichroic mirror are provided with.Wherein the red successively from left to right laser instrument 11 of ruddiness light path, anti-green red dichroic mirror 83, convergent lens 20, first integral rod 31, second integral rod 32, hot spot amplifying lens group 40, anti-green red dichroic mirror 83, polarization splitting prism 80, lcos imager chip 52 are above polarization splitting prism 80, color-combination prism 60, ruddiness enter the polarization splitting prism 80 of color-combination prism 60 tops through anti-green red dichroic mirror 83 transmissions; Green glow light path and ruddiness light path are basic identical, and its difference is: green laser 12 is positioned at the anti-top of being popular in green dichroic mirror 83 that 135 ° of angles are provided with, and green glow enters the polarization splitting prism 80 of color-combination prism 60 lefts through anti-green red dichroic mirror 83 reflections; The blue successively from left to right laser instrument 13 of blue streak light path, convergent lens 20, first integral rod 31, second integral rod 32, hot spot amplifying lens group 40, polarization splitting prism 80, lcos imager chip 52 below polarization splitting prism 80, color-combination prism 60, projection objective group 70 is positioned at the right-hand of color-combination prism 60.
By red laser instrument 11, green laser 12, the directional light that blue laser instrument 13 sends is aforesaid to become uniform dissipation spot illumination hot spot to 32 outlets of second integral rod, hot spot amplifying lens group 40 is passed through polarization splitting prism 80 amplification imagings on lcos imager chip 52 with the uniform light spots of second integral rod 32 outlets, lcos imager chip 52 changes the polarization state of incident ray, with light reflected back polarization splitting prism 80, light enters color-combination prism 60 again, color-combination prism 60 is superimposed as a width of cloth coloured image with three red green orchids, and projection objective 70 images in screen with composograph.
In embodiment three, adopt anti-green red dichroic mirror 83 that the laser beam that red laser instrument 11, green laser 12 send is coupled earlier, enter convergent lens 20 together, behind the anti-green red dichroic mirror 83 through being provided with after the hot spot amplifying lens group 40, the ruddiness transmission enters the polarization splitting prism 80 of color-combination prism 60 tops, and the green glow reflection enters the polarization splitting prism 80 of color-combination prism 60 lefts.Wherein first counter be popular in green dichroic mirror 83 can be at 45 the angle be provided with, at this moment green laser 12 is positioned at the anti-below of being popular in green dichroic mirror 83 of 45 setting.
Equally, in embodiment 3, also green glow can be coupled earlier with blue streak and separate, perhaps coupling earlier separates ruddiness again with blue streak, and these all are the equivalents of embodiment 3.
Above embodiment is intended to illustrate the present invention, and limitation of the present invention by no means, and those skilled in the art is according to description, limits under the principle of general plotting of the present invention of its scope not breaking away from claim and equivalent thereof, can make a change embodiment.
Claims (16)
1. the system of an eliminate laser speckle comprises:
LASER Light Source has the laser instrument that at least one is used to send laser beam;
The focusing optical unit, the laser beam that is used for LASER Light Source is sent is assembled;
The integrating rod unit has at least one first integral rod, and this first integral rod continuously moves up and down;
Described LASER Light Source, focusing optical unit, integrating rod unit are arranged in order.
2. the system of eliminate laser speckle according to claim 1 is characterized in that: described first integral rod travel frequency is more than the 20Hz.
3. the system of eliminate laser speckle according to claim 1 and 2, it is characterized in that: described integrating rod unit also comprises a second integral rod.
4. the projector of an eliminate laser speckle comprises:
LASER Light Source has the laser instrument that at least one is used to send laser beam;
The focusing optical unit, the laser beam that is used for LASER Light Source is sent is assembled;
The integrating rod unit has at least one first integral rod, and this first integral rod continuously moves up and down;
Hot spot amplifying lens group has the optical element that at least one is used to amplify hot spot;
Imager chip is used for optical system imaging;
The projection objective group has at least one and is used for the projection objective of image imaging in screen;
Described LASER Light Source, focusing optical unit, integrating rod unit, hot spot amplifying lens group, imager chip and projection objective group are arranged in order.
5. projector according to claim 4 is characterized in that: described first integral rod travel frequency is more than the 20Hz.
6. according to claim 4 or 5 described projectors, it is characterized in that: described integrating rod unit also comprises a second integral rod.
7. projector according to claim 4 is characterized in that: described LASER Light Source is taken from red laser instrument, green laser and blue laser instrument.
8. projector according to claim 4 is characterized in that: described imager chip is taken from lcd imager chip, lcos imager chip and DMD imager chip.
9. projector according to claim 7, it is characterized in that: described projector also comprises color-combination prism, described red laser instrument, green laser, blue laser instrument are formed ruddiness light path, green glow light path, blue streak light path with described focusing optical unit, integrating rod unit, hot spot amplifying lens group, imager chip respectively, described color-combination prism is between described ruddiness light path, green glow light path and blue streak light path and described projection objective group, be used for the image of described ruddiness light path, green glow light path and blue streak light path is synthesized, image in screen through described projection objective group.
10. projector according to claim 9 is characterized in that: perpendicular to any three workplaces of described color-combination prism, the projection objective group is perpendicular to the another one workplace of color-combination prism respectively for described ruddiness light path, green glow light path, blue streak light path.
11. projector according to claim 9, it is characterized in that: described projector also comprises two partial reflection part transmission optical component groups, first's reflecting part transmission optical component group is between described red laser instrument, green laser and focusing optical unit, enter described focusing optical unit after the laser beam coupling that red laser instrument, green laser are sent, after integrating rod unit, hot spot amplifying lens group, again through second portion reflecting part transmission optical component component from.
12. projector according to claim 11 is characterized in that: described projector also comprises three polarization splitting prisms, lays respectively at top, below and the left of described color-combination prism.
13. projector according to claim 7, it is characterized in that: described projector also comprises partial reflection part transmission optical component group, between described LASER Light Source and described focusing optical unit, described red laser instrument, green laser and blue laser instrument send laser beam successively in turn.
14. projector according to claim 13 is characterized in that: described projector also comprises reflective mirror and fully interior anti-prism group, between described imager chip and described projection objective group.
15. according to claim 13 or 14 described projectors, it is characterized in that: described partial reflection part transmission optical component group is anti-blue green dichroic mirror and the anti-blue saturating red green dichroic mirror of being popular in, its angle respectively at 45 is provided with, described green laser is positioned at described anti-left side of being popular in blue green dichroic mirror and the saturating red green dichroic mirror of described anti-orchid, described red laser instrument is positioned at described anti-below of being popular in blue green dichroic mirror, and described blue laser instrument is positioned at the below of the saturating red green dichroic mirror of described anti-orchid.
16. according to claim 13 or 14 described projectors, it is characterized in that: described partial reflection part transmission optical component group is anti-blue green dichroic mirror and the anti-blue saturating red green dichroic mirror of being popular in, it becomes 135 ° of angles to be provided with respectively, described green laser is positioned at described anti-left side of being popular in blue green dichroic mirror and the saturating red green dichroic mirror of described anti-orchid, described red laser instrument is positioned at described anti-top of being popular in blue green dichroic mirror, and described blue laser instrument is positioned at the top of the saturating red green dichroic mirror of described anti-orchid.
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| CN200810204085A CN101750753A (en) | 2008-12-05 | 2008-12-05 | System for eliminating laser speckles and projector using same |
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| CN200810204085A CN101750753A (en) | 2008-12-05 | 2008-12-05 | System for eliminating laser speckles and projector using same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053382A (en) * | 2011-01-29 | 2011-05-11 | 中北大学 | Speckle elimination device based on Mie scattering and optical device |
| CN102096293A (en) * | 2011-01-30 | 2011-06-15 | 河南科技大学 | Optical engine for three-piece liquid crystal on silicon (LCOS) laser projection display |
| CN102645830A (en) * | 2011-12-08 | 2012-08-22 | 深圳市光峰光电技术有限公司 | Light source system and projector |
| WO2013037161A1 (en) * | 2011-09-15 | 2013-03-21 | 深圳市佶达德科技有限公司 | Homogenization method for laser lighting supplementation and laser illumination device thereof |
| CN105872504A (en) * | 2016-03-25 | 2016-08-17 | 联想(北京)有限公司 | Data processing method and electronic device |
| CN106291965A (en) * | 2016-08-26 | 2017-01-04 | 湖北久之洋红外系统股份有限公司 | A kind of without speckle tricolor laser light source and laser projection system |
| CN113031294A (en) * | 2019-12-09 | 2021-06-25 | 觉芯电子(无锡)有限公司 | Speckle suppression method and device and laser micro-projection module |
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2008
- 2008-12-05 CN CN200810204085A patent/CN101750753A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053382B (en) * | 2011-01-29 | 2013-06-05 | 中北大学 | Speckle elimination device based on Mie scattering and optical device |
| CN102053382A (en) * | 2011-01-29 | 2011-05-11 | 中北大学 | Speckle elimination device based on Mie scattering and optical device |
| CN102096293A (en) * | 2011-01-30 | 2011-06-15 | 河南科技大学 | Optical engine for three-piece liquid crystal on silicon (LCOS) laser projection display |
| CN102096293B (en) * | 2011-01-30 | 2012-06-27 | 河南科技大学 | Optical engine for three-piece liquid crystal on silicon (LCOS) laser projection display |
| WO2013037161A1 (en) * | 2011-09-15 | 2013-03-21 | 深圳市佶达德科技有限公司 | Homogenization method for laser lighting supplementation and laser illumination device thereof |
| CN102645830B (en) * | 2011-12-08 | 2015-07-29 | 深圳市光峰光电技术有限公司 | Light-source system and projection arrangement |
| CN102645830A (en) * | 2011-12-08 | 2012-08-22 | 深圳市光峰光电技术有限公司 | Light source system and projector |
| CN104991410B (en) * | 2011-12-08 | 2017-05-17 | 深圳市光峰光电技术有限公司 | Light source system and projection device |
| CN105872504A (en) * | 2016-03-25 | 2016-08-17 | 联想(北京)有限公司 | Data processing method and electronic device |
| CN106291965A (en) * | 2016-08-26 | 2017-01-04 | 湖北久之洋红外系统股份有限公司 | A kind of without speckle tricolor laser light source and laser projection system |
| CN106291965B (en) * | 2016-08-26 | 2019-10-29 | 湖北久之洋红外系统股份有限公司 | A kind of no speckle tricolor laser light source and laser projection system |
| CN113031294A (en) * | 2019-12-09 | 2021-06-25 | 觉芯电子(无锡)有限公司 | Speckle suppression method and device and laser micro-projection module |
| CN113031294B (en) * | 2019-12-09 | 2022-11-11 | 觉芯电子(无锡)有限公司 | Speckle suppression method and device and laser micro-projection module |
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Open date: 20100623 |