CN113093398B - Speckle eliminating assembly, light source device and control method of light source device - Google Patents
Speckle eliminating assembly, light source device and control method of light source device Download PDFInfo
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- CN113093398B CN113093398B CN202110381875.0A CN202110381875A CN113093398B CN 113093398 B CN113093398 B CN 113093398B CN 202110381875 A CN202110381875 A CN 202110381875A CN 113093398 B CN113093398 B CN 113093398B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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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
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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Abstract
The application discloses a speckle eliminating assembly, a light source device and a control method of the light source device, and belongs to the technical field of projection. The plaque dissipation assembly includes a light transmissive container, a diffusion media, and a rotating member. The diffusion medium is positioned in the light-transmitting container, the light-transmitting container is connected with the rotating part, when the laser beam irradiates the speckle eliminating assembly, the rotating part can drive the light-transmitting container to rotate, so that the diffusion medium in the light-transmitting container moves along with the light-transmitting container, the coherence of the laser beam penetrating through the diffusion medium can be effectively reduced, the speckle phenomenon of the laser beam is weakened, the problem that the speckle eliminating effect of the speckle eliminating assembly in the related technology is poor can be solved, and the effect of effectively inhibiting the speckle phenomenon is achieved.
Description
Technical Field
The present disclosure relates to the field of projection technologies, and in particular, to a speckle reduction assembly, a light source device, and a control method of the light source device.
Background
The laser projection technology has become the mainstream development direction in the market due to its advantages of high picture contrast, clear image, bright color, high brightness, and the like. The projection equipment in the laser projection technology can comprise a light source device and an optical machine illumination device, and the quality of a light source provided by the light source device is an important factor influencing the display effect of the projection equipment. The laser has the characteristic of high coherence, and the high coherence of the laser can cause laser speckles in laser projection, and the laser speckles can influence the quality of a display picture.
However, current speckle reduction assemblies have poor speckle reduction.
Disclosure of Invention
The embodiment of the application provides a speckle eliminating assembly, a light source device and a control method of the light source device. The technical scheme is as follows:
according to an aspect of the present application, there is provided an evanescent spot assembly comprising a light transmissive container, a diffusion medium, and a rotating member;
the diffusion medium is positioned in the light-transmitting container, and the light-transmitting container is connected with the rotating component.
Optionally, the light-transmissive container has an annular chamber in which the diffusion medium is located.
Optionally, the light-transmitting container has at least two chambers, and different diffusion media are accommodated in the at least two chambers;
the at least two chambers are arranged around the rotating shaft of the rotating part;
alternatively, the at least two chambers are arranged in a direction away from the rotational axis of the rotating member.
Optionally, the cross sections of the at least two chambers sectioned by the first plane are both in a fan-ring shape, and the first plane is a plane perpendicular to the rotating shaft of the rotating member and intersecting with the transparent container.
Optionally, the diffusion media comprises one or more of a liquid media, a solid media, or a solid-liquid mixture media.
Optionally, the liquid medium comprises water, an inorganic salt solution, an aqueous solution of an organic alcohol or a transparent organic solution, and the solid comprises an inorganic compound or transparent organic spherical particles.
Optionally, an antireflection film is formed on the light-transmitting container;
or an antireflection film is formed on one side of the light-transmitting container close to the laser light source, and a reflecting film is formed on one side of the light-transmitting container far away from the laser light source.
According to another aspect of the present application, there is provided a light source device, which includes a laser light source, an optical path component and the speckle reduction component set in sequence along an optical path direction.
According to another aspect of the present application, there is provided a control method of a light source apparatus, for the light source apparatus described above, the method including:
receiving a timing control signal;
and controlling a laser light source in the light source device to be started according to the time sequence control signal, and controlling a rotating part in the light source device to drive the speckle dispersing component to rotate.
Optionally, the laser light source comprises at least a first laser for emitting laser light of a first color and a second laser for emitting laser light of a second color;
the laser light source in the light source device is controlled to be started according to the time sequence control signal, and a rotating part in the light source device is controlled to drive the speckle eliminating assembly to rotate, and the method comprises the following steps:
when the timing control signal indicates to output the first color laser, starting the first laser, and controlling the rotating component to drive the speckle eliminating assembly to rotate at a first rotating speed;
and when the time sequence control signal indicates that the laser of the second color is output, the second laser is started, and the rotating part is controlled to drive the speckle eliminating assembly to rotate at a second rotating speed.
Optionally, the laser light source includes at least a first laser for emitting a first color laser and a second laser for emitting a second color laser, and the light-transmitting container in the light source device has at least two chambers, where the at least two chambers include a first chamber corresponding to the first color laser and a second chamber corresponding to the second color laser;
the laser light source in the light source device is controlled to be started according to the time sequence control signal, and a rotating part in the light source device is controlled to drive the speckle eliminating assembly to rotate, and the method comprises the following steps:
when the timing control signal indicates that the first-color laser is output, the first laser is started, and the rotating part is controlled to drive the speckle dissipating component to rotate, so that the first-color laser emitted by the first laser irradiates the first chamber;
and when the timing control signal indicates that the second-color laser is output, the second laser is started, and the rotating part is controlled to drive the speckle dispersing component to rotate, so that the second-color laser emitted by the second laser irradiates the second cavity.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
a speckle-dissipating assembly is provided that includes a light-transmissive container, a diffusion medium, and a rotating member. The diffusion medium is positioned in the light-transmitting container, the light-transmitting container is connected with the rotating part, when the laser beam irradiates the speckle eliminating assembly, the rotating part can drive the light-transmitting container to rotate, so that the diffusion medium in the light-transmitting container moves along with the light-transmitting container, the coherence of the laser beam penetrating through the diffusion medium can be effectively reduced, the speckle phenomenon of the laser beam is weakened, the problem that the speckle eliminating effect of the speckle eliminating assembly in the related technology is poor can be solved, and the effect of effectively inhibiting the speckle phenomenon is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of a plaque dissipating assembly;
FIG. 2 is a schematic structural diagram of a plaque dissipation assembly provided by an embodiment of the present application;
FIG. 3 is a front view of a light-transmissive container provided in accordance with an embodiment of the present application;
FIG. 4 is a front view of another light-transmitting container provided by an embodiment of the present application;
FIG. 5 is a schematic cross-sectional view of the light-transmitting container shown in FIG. 3;
FIG. 6 is a schematic cross-sectional view of another light-transmitting container provided in the embodiments of the present application;
FIG. 7 is a schematic cross-sectional view of another light-transmitting container provided in the embodiments of the present application;
FIG. 8 is a schematic cross-sectional view of another light-transmitting container provided in the embodiments of the present application;
FIG. 9 is a schematic cross-sectional view of another light-transmitting container provided in the embodiments of the present application;
FIG. 10 is a schematic cross-sectional view of another light-transmitting container provided in the embodiments of the present application;
fig. 11 is a schematic structural diagram of a light source device according to an embodiment of the present disclosure;
FIG. 12 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present application;
fig. 13 is a flowchart of a control method of a light source device according to an embodiment of the present application;
fig. 14 is a flowchart of another control method for a light source device according to an embodiment of the present disclosure;
fig. 15 is a flowchart of another control method of a light source device according to an embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Speckle refers to when coherent light source shines coarse object, and the light after the scattering is because the phase difference is constant, and the light wave frequency is the same, and the vibration direction is unanimous, produces the interference in the space, and some partial interference is long, and some partial interference is destructive, and then can form the granular point that light intensity distributes light and dark inhomogeneous on the screen, and it can be understood that, laser has the characteristics of high coherence, and the high coherence of laser can cause and have laser speckle in the laser projection, and this laser speckle can influence display screen's display effect.
At present, in order to eliminate the influence of laser speckle on a display screen, a speckle eliminating assembly is arranged in a light source device, as shown in fig. 1, fig. 1 is a schematic structural diagram of the speckle eliminating assembly, the speckle eliminating assembly 11 includes a diffusion sheet 111 and a driving motor 112, and when a laser beam irradiates the speckle eliminating assembly 11, the driving motor 112 drives the diffusion sheet 111 to rotate at a high speed, so as to achieve the purposes of reducing laser coherence and suppressing laser speckle.
However, the speckle reduction assembly has poor speckle reduction effect on a portion of the light beams, for example, the speckle reduction assembly has poor speckle reduction effect on red light beams and green light beams, which results in poor quality of the display screen of the projection apparatus.
The embodiment of the application provides a speckle eliminating assembly, a light source device and a control method of the light source device, which can solve the problems.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a speckle dissipating assembly provided by an embodiment of the present application, and the speckle dissipating assembly 20 may include a light-transmitting container 21, a diffusion medium 22, and a rotating member 23. The diffusion medium 22 is located in the light-transmitting container 21, and the light-transmitting container 21 is connected to the rotating member 23.
When laser beam shines to the spot subassembly that dissipates, rotatable part 23 can drive printing opacity container 21 rotatory for diffusion medium 22 in the printing opacity container 21 continuously changes along with it, so can promote the diffusion ability to laser beam, and then the reinforcing is to laser beam's the effect of eliminating the spot, can dissipate the spot to the laser beam of different wave bands simultaneously and handle.
Wherein the laser beam may include laser beams of at least two different wavebands.
In summary, embodiments of the present application provide a speckle dissipating assembly that includes a light transmissive container, a diffusion medium, and a rotating member. The diffusion medium is positioned in the light-transmitting container, the light-transmitting container is connected with the rotating part, when the laser beam irradiates the speckle eliminating assembly, the rotating part can drive the light-transmitting container to rotate, so that the diffusion medium in the light-transmitting container moves along with the light-transmitting container, the coherence of the laser beam penetrating through the diffusion medium can be effectively reduced, the speckle phenomenon of the laser beam is weakened, the problem that the speckle eliminating effect of the speckle eliminating assembly in the related technology is poor can be solved, and the effect of effectively inhibiting the speckle phenomenon is achieved.
The speckle-dispersing component provided by the embodiment of the application can comprise the following structures:
in an exemplary embodiment of the present disclosure, a light-transmissive container has an annular chamber, and a diffusion medium may be accommodated in the annular chamber. That is, the number of chambers in the light-transmitting container may be 1, and one chamber is filled with one kind of diffusion medium.
Optionally, as shown in fig. 2, which is a schematic structural diagram of a speckle dispersing assembly provided in an embodiment of the present application. Wherein the light-transmitting container 21 has an annular chamber 211, and the diffusion medium 22 is located in the annular chamber 211. The light-transmitting container 21 may include a highly transparent material, i.e., a material having a high light transmittance (a ratio of the intensity of light transmitted through the material to the intensity of incident light in the incident light is referred to as light transmittance), such as a transparent glass or the like, for example.
With such a structure, when the rotating member 23 drives the light-transmitting container 21 to rotate, the diffusion medium 22 located in the annular chamber 211 rotates along with the light-transmitting container 21 and may generate continuous random variation, so that the diffusion medium 22 can enable the light beam to be scattered for multiple times, and the scattered light has different phases and scattering angles at different moments, thereby reducing coherence of the light beam and further achieving the effect of eliminating speckles.
In addition, the annular chamber 211 can make the force applied to the diffusion medium 22 more uniform when the light-transmitting container 21 rotates, thereby increasing the stability of the speckle-dissipating component. Different rotating speeds can be adopted for the laser beams with different colors, wherein the diffusing capacity of the laser beam by the speckle elimination assembly is positively correlated with the rotating speed of the speckle elimination assembly, namely the faster the rotating speed of the speckle elimination assembly is, the stronger the diffusing capacity of the laser beam is, and the better the speckle elimination effect of the laser beam is. In addition, the speckle phenomenon of the laser beam is positively correlated with the wavelength, i.e., the longer the wavelength is, the more severe the speckle phenomenon is. Therefore, for a laser beam with a longer wavelength, the rotating speed of the corresponding speckle elimination assembly can be faster, and illustratively, the speckle elimination assembly is used for processing laser beams of three colors of red, green and blue, the rotating speed of the red laser beam corresponding to the speckle elimination assembly is A, the rotating speed of the green laser beam corresponding to the speckle elimination assembly is B, and the rotating speed of the blue laser beam corresponding to the speckle elimination assembly is C, wherein A > B > C.
It should be noted that positive correlation means that the two variables have the same variation direction, and when one variable changes from large to small or from small to large, the other variable also changes from large to small or from small to large, i.e. the tangent slope of the data curve is always greater than zero. In the case of a positive correlation, one variable changes in the same direction as the other variable (both variables become larger or smaller at the same time). In this case, the amount causing the change is called an independent variable (i.e., the amount that changes by itself), and the other variable is called a dependent variable (i.e., the amount that changes following the independent variable).
The rotating member 23 may further include a rotating shaft 231, a supporting substrate 232, and a driving motor, the supporting substrate 232 is connected to the rotating shaft 231 and the transparent container 21, and the supporting substrate 232 may serve to fix the transparent container 21. The driving motor can drive the speckle eliminating assembly to rotate, so that the laser light of different colors emitted by the laser light source irradiates on the speckle eliminating assembly.
The carrier substrate 232 may include a light transmissive substrate or a light opaque substrate. When the carrier substrate 232 is a transparent substrate, the transparent container 21 may be disposed on the carrier substrate 232 and connected to the carrier substrate 232, and the carrier substrate 232 may include a transparent glass plate or a sapphire substrate, for example.
When the carrier substrate 232 is an opaque substrate, the carrier substrate 232 may have a circular shape, and the inner outer wall of the annular transparent container 21 may be connected to the outer edge of the carrier substrate 232. Illustratively, the carrier substrate 232 may be a metal substrate.
In another speckle reduction assembly provided by the embodiment of the application, the light-transmitting container has at least two chambers, and different diffusion media can be accommodated in the at least two chambers.
Alternatively, as shown in fig. 3, fig. 3 is a front view of a light-transmitting container, which is viewed toward the light-transmitting container in a length direction of a rotating shaft and provided by the embodiment of the present application, where the light-transmitting container 41 has at least two chambers 411, and at least two chambers 411 contain different diffusion media; at least two chambers 411 are arranged around the rotational axis 231 of the rotating member, and the light-transmissive container 41 may have three chambers 411, for example.
Different diffusion media in at least two cavities can be correspondingly dispelled the spot to the laser beam of different wavelength and handle, and wherein different diffusion media can have different diffusion capacity, and then can correspond the laser beam of different wavelength, can the pertinence dispel the spot to the laser beam of different wavelength and handle, and then can more effective suppression laser beam's speckle phenomenon. Illustratively, the blue laser beam corresponds to one diffusion medium and the red laser beam corresponds to another diffusion medium, wherein the red laser beam corresponds to the diffusion medium with a stronger diffusion capability.
As shown in fig. 4, fig. 4 is a front view of another light-transmitting container provided in the embodiment of the present application, which is viewed from the center of the light-transmitting container along the length direction of the rotating shaft, and at least two chambers 511 are arranged in a direction away from the rotating shaft 231 of the rotating member. Wherein at least two chambers 511 may house different diffusion media.
Illustratively, the at least two chambers may include an inner ring chamber 5111 and an outer ring chamber 5112, and the inner ring chamber 5111 and the outer ring chamber 5112 may contain different diffusion media, and the light beams with different wavelengths may be irradiated to different positions (the inner ring chamber 5111 or the outer ring chamber 5112) of the light-transmitting container by the light beams with different wavelengths in the light path, so that the light beams with different wavelengths correspond to different diffusion media.
Under the structure, corresponding speckle elimination processing can be simultaneously carried out on different laser beams, and the speckle phenomenon of the laser beams can be more effectively inhibited.
Alternatively, as shown in fig. 5, fig. 5 is a schematic cross-sectional structural diagram of the light-transmitting container shown in fig. 3, where the cross-sectional diagram is taken along a first plane (the first plane is a plane perpendicular to the rotating shaft 231 of the rotating component and intersects with the light-transmitting container 41), the cross-section of the at least two chambers 411 taken along the first plane is a sector ring, the light-transmitting container 41 may have three chambers 411, and different diffusion media are accommodated in the three chambers 411, and the diffusion media may include a first diffusion medium 4221, a second diffusion medium 4222, and a third diffusion medium 4223.
As shown in fig. 6, fig. 6 is a schematic structural diagram of another light-transmitting container provided in this embodiment of the present application, the light-transmitting container may have a first chamber 711, a second chamber 712, and a third chamber 713, a first diffusion medium 721 is accommodated in the first chamber 711, a second diffusion medium 722 is accommodated in the second chamber 712, and a third diffusion medium 723 is accommodated in the third chamber 713, the three chambers have a fan-ring shape in cross section taken by a first plane, and the light-transmitting container may be disposed on and connected to a carrier substrate, or the light-transmitting container may be directly connected to a rotating shaft of a rotating component without a carrier substrate. Illustratively, the green light beam corresponds to a first diffusion medium in the first chamber, the red light beam corresponds to a second diffusion medium in the second chamber, the blue light beam corresponds to a third diffusion medium in the third chamber, when the rotating member drives the light-transmitting container to rotate, the green light beam can correspondingly irradiate the first diffusion medium in the first chamber, the red light beam can correspondingly irradiate the second diffusion medium in the second chamber, and the blue light beam can correspondingly irradiate the third diffusion medium in the third chamber, so that when the laser beams are output in a time-sequential manner, different media in different chambers can correspondingly process lasers with different wavelengths, the lasers with different wavelengths can be diffused, and the speckle-dissipating effect for various colors of light is improved.
Optionally, the diffusion medium comprises one or more of a liquid medium, a solid medium, or a solid-liquid mixture medium.
Illustratively, when the light-transmissive container has an annular chamber, the diffusion medium in the annular chamber may be a liquid medium, a solid medium, or a solid-liquid mixture medium.
Alternatively, the liquid medium comprises water, an inorganic salt solution, an aqueous solution of an organic alcohol or a transparent organic solution, and the solid comprises an inorganic compound or transparent organic spherical particles.
Wherein the inorganic salt solution may include sodium chloride (NaCl) solution, calcium chloride (CaCl) 2 ) Solution or zinc sulfate (ZnSO) 4 ) A solution; the aqueous solution of organic alcohol may include methanol (CH) 3 OH) aqueous solution, ethanol (C) 2 H 6 O) aqueous solution or isopropyl alcohol (C) 3 H 8 O) in aqueous solution; the transparent organic solution may include glycerol (C) 3 H 8 O 3 ) (ii) a The inorganic compound spherical particles may include Silica (SiO) 2 ) Spherical particles; the transparent organic spherical particles may include methyl methacrylate (C) 5 H 8 O 2 ) Spherical particles.
Illustratively, when the light-transmitting container has three chambers, the diffusion media of the three chambers in the light-transmitting container may be a liquid medium, a solid medium and a solid-liquid mixture medium, respectively; or solid-liquid mixture media with different numbers of solid spherical particles in unit volume are respectively arranged in the three chambers. As shown in fig. 6, among others, the first diffusion medium 721 may be a liquid medium, the second diffusion medium 722 may be a solid medium, and the third diffusion medium 723 may be a solid-liquid mixture medium.
When the diffusion medium is a solid-liquid mixture medium, the diffusion capacity of the solid-liquid mixture medium to the laser beam is positively correlated with the number of solid spherical particles in the unit volume of the solid-liquid mixture medium, that is, the larger the number of solid spherical particles in the unit volume of the solid-liquid mixture medium is, the stronger the diffusion capacity to the laser beam is, and the better the speckle dissipation effect to the laser beam is, and the positive correlation between the speckle phenomenon of the laser beam and the wavelength is, that is, the longer the wavelength is, the more serious the speckle phenomenon is. Therefore, for a laser beam with a longer wavelength, the number of the solid spherical particles in the unit volume of the solid-liquid mixture medium of the corresponding spot dissipation assembly can be more, for example, the solid-liquid mixture medium is used for processing laser beams of three colors of red, green and blue, the number of the solid spherical particles in the unit volume of the solid-liquid mixture medium corresponding to the laser beam of the red color is X, the number of the solid spherical particles in the unit volume of the solid-liquid mixture medium corresponding to the laser beam of the green color is Y, and the number of the solid spherical particles in the unit volume of the solid-liquid mixture medium corresponding to the laser beam of the blue color is Z, where X > Y > Z.
Optionally, an antireflection film is formed on the transparent container, so that the light transmittance of the transparent container can be improved, and the phenomenon of insufficient brightness of a projection picture caused by low light transmittance of the transparent container is avoided.
As shown in fig. 7, fig. 7 is a schematic cross-sectional structure diagram of a light-transmitting container cut by a plane parallel to a rotation axis according to an embodiment of the present disclosure, a cross section of the light-transmitting container 911 may be a circle, an antireflection film 912 is formed on the light-transmitting container 911, different diffusion media 913 are contained in the light-transmitting container 911, the diffusion media 913 may include a first diffusion medium 9131 and a second diffusion medium 9132, and a laser beam S may directly pass through the light-transmitting container 911 and the diffusion medium 913, which are formed with the antireflection film 912, and exit from a speckle elimination assembly, so that a light path structure is simpler.
The antireflection film, also called as an antireflection film, has a main function of reducing or eliminating reflected light on the surface of the transparent container, thereby increasing the light transmittance of the transparent container.
As shown in fig. 8, fig. 8 is a schematic cross-sectional structure of another light-transmitting container provided in the embodiment of the present application, which is taken by a plane parallel to the rotation axis, and the cross section of the light-transmitting container 911 may be a square.
Alternatively, as shown in fig. 9, fig. 9 is a schematic cross-sectional structural view of another light-transmitting container provided in this embodiment of the present application, where the cross section of the light-transmitting container 911 is cut by a plane parallel to the rotation axis, the cross section of the light-transmitting container 911 may be a circle, and an antireflection film 912 is formed on a side of the light-transmitting container 911 close to the laser light source and a reflection film 914 is formed on a side of the light-transmitting container 911 away from the laser light source.
With such a structure, after irradiating the speckle reduction assembly, the laser beam S emitted from the laser light source passes through the side of the transparent container 911 with the anti-reflection film 912 close to the laser light source and the diffusion medium 913, and after being reflected by the side of the transparent container 911 with the reflection film 914 far away from the laser light source, passes through the diffusion medium 913 and the side of the transparent container 911 with the anti-reflection film 912 close to the laser light source again, and exits the speckle reduction assembly. The laser beam may be caused to pass through the diffusion medium 913 twice to achieve a better speckle reduction effect.
As shown in fig. 10, fig. 10 is a schematic cross-sectional structure view of another light-transmitting container provided in the embodiment of the present application, the cross-section of the light-transmitting container 911 may be a square.
Alternatively, the antireflection film or the reflection film may be formed on the outer wall of the light-transmitting container, or may be formed on the inner wall of the light-transmitting container.
In summary, embodiments of the present application provide a speckle dissipating assembly that includes a light transmissive container, a diffusion medium, and a rotating member. The diffusion medium is positioned in the light-transmitting container, the light-transmitting container is connected with the rotating part, when the laser beam irradiates the speckle eliminating assembly, the rotating part can drive the light-transmitting container to rotate, so that the diffusion medium in the light-transmitting container moves along with the light-transmitting container, the coherence of the laser beam penetrating through the diffusion medium can be effectively reduced, the speckle phenomenon of the laser beam is weakened, the problem that the speckle eliminating effect of the speckle eliminating assembly in the related technology is poor can be solved, and the effect of effectively inhibiting the speckle phenomenon is achieved.
According to another aspect of the present application, there is provided a light source device, as shown in fig. 11, fig. 11 is a schematic structural diagram of a light source device provided in an embodiment of the present application, and the light source device includes a laser light source 81, an optical path component 82, and the speckle eliminating component 83, which are sequentially arranged along an optical path direction. The light source device may further include a light homogenizing part 84, and the light homogenizing part 84 is configured to homogenize the light beam emitted from the light-compensating spot module 83 to achieve the effect of outputting a light beam with higher quality. Alternatively, the light unifying member 84 may be a light pipe.
The laser light source 81 may include a first laser 811, a second laser 812, and a third laser 813. Illustratively, the first laser 811 may emit blue laser light, the second laser 812 may emit green laser light, and the third laser 813 may emit red laser light.
The optical path component 82 may include a first light combining mirror 821 and a second light combining mirror 822, the laser beam of the first color emitted from the first laser 811 and the laser beam of the second color emitted from the second laser 812 may be vertically aligned, the laser beam of the first color and the laser beam of the second color are combined by the first light combining mirror 821, and the light combining mirror 821 may include a mirror having a gap, and the mirror may allow the laser beam of the first color to directly pass through and reflect the laser beam of the second color, and the laser beam of the second color is reflected by the first light combining mirror and then travels in the same direction as the laser beam of the first color. The first light combining mirror 821 may be a dichroic mirror, and has a function of transmitting the laser beam of the first color and reflecting the laser beam of the second color.
The first color laser beam and the second color laser beam passing through the first light combining mirror 821 are combined again with the third color laser beam by the second light combining mirror 822, and finally the three color laser beams are emitted in the same direction.
The light path component 82 can further include a light path shaping component 823, the light path shaping component 823 is located between the laser light source 81 and the speckle eliminating component 83, and is used for performing beam shrinking processing on laser light emitted by the laser light source 81 and guiding the laser light to the speckle eliminating component 83, wherein the laser light beam is changed into a parallel light beam to be emitted after passing through the shaping unit 8231, is reflected by the reflecting lens 8232, is focused by the outlet lens 8233, passes through the speckle eliminating component 83, and then enters the dodging component 84.
The speckle eliminating assembly 83 is used for reducing coherence of the laser beam passing through the diffusion medium and outputting the laser beam after speckle eliminating processing to the light homogenizing component 84, so that speckle formation in a laser display image can be effectively inhibited.
Different diffusion media can be accommodated in the light-transmitting container of the speckle eliminating component 83, and when the light source device outputs blue light, a corresponding medium in the speckle eliminating component 83 is used for transmitting the blue light led out by the light path component 12; when the light source device outputs red light, the other medium in the speckle eliminating component 83 is used for transmitting red laser in the laser guided out by the optical path component 12; when the light source device outputs green light, the corresponding other medium in the speckle reduction member 83 is used for green light in the laser light guided out through the optical path member 12.
Or, the same diffusion medium may be accommodated in the light-transmitting container of the speckle dispersing component 83, and when the light source device outputs blue laser, the rotation speed of the speckle dispersing component 83 is a first rotation speed, and is used for transmitting the blue laser led out by the light path component 12; when the light source device outputs red laser light, the rotation speed of the speckle eliminating component 83 is a second rotation speed, and is used for transmitting the red laser light in the laser light guided out by the light path component 12; when the light source device outputs the green laser, the rotation speed of the speckle reduction component 83 is a third rotation speed, and is used for transmitting the green laser in the laser guided out by the optical path component 12.
With such a structure, the light source device can output the first color light beam, the second color light beam and the third color light beam which are respectively subjected to the speckle reduction treatment, and the display of pictures of various colors can be realized through the three color light beams.
The wavelength of the first-color laser light emitted by the first laser is smaller than the wavelength of the second-color laser light emitted by the second laser. For example, a first laser may emit blue laser light of a specified spectral range, a second laser may emit green laser light of a specified spectral range, and a third laser may emit red laser light of a specified spectral range.
In another aspect of the embodiments of the present application, a projection apparatus is provided. Fig. 12 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present application, and as shown in fig. 12, the projection apparatus includes the light source device 30, an illumination assembly 40, and a projection assembly 50, where the light source device 30 emits a light beam, and the illumination assembly 40 homogenizes and shapes the light beam and guides the light beam to the projection assembly 50, thereby implementing an imaging function.
The illumination assembly 40 further includes a light valve 401, and the light valve 401 is configured to digitally modulate the light beam emitted by the light source device. The reflection of the beam color is achieved by the fast flipping of the micromirrors on the light valve 401. The resolution of the light valve 401 may be 2k, 3k, or 4k. The embodiments of the present application do not limit this.
In summary, the present application provides a light source device, which includes a laser light source, an optical path component, and a speckle dispersing component, where the speckle dispersing component includes a light-transmitting container, a diffusion medium, and a rotating component. The diffusion medium is arranged in the light-transmitting container, the light-transmitting container is connected with the rotating part, when the laser beam irradiates the speckle eliminating assembly, the rotating part can drive the light-transmitting container to rotate, so that the diffusion medium in the light-transmitting container moves along with the light-transmitting container, coherence of the laser beam penetrating through the diffusion medium can be effectively reduced, speckle phenomena of the laser beam are weakened, the problem that speckle eliminating effects of the speckle eliminating assembly in the related technology are poor can be solved, and the effect of effectively restraining the speckle phenomena is achieved.
According to another aspect of the present application, there is provided a control method for a light source apparatus, which may be applied to any one of the light source apparatuses provided in the foregoing embodiments, as shown in fig. 13, where fig. 13 is a flowchart of the control method for the light source apparatus provided in the present application embodiment, and the method may include the following steps:
The method provided by the embodiment of the application can be applied to a control component in the light source device, and the control component can receive the timing control signal and control each part in the light source device based on the timing control signal.
And 902, controlling a laser light source in the light source device to be started according to the time sequence control signal, and controlling a rotating part in the light source device to drive the speckle eliminating assembly to rotate.
After the laser light source is started, the laser beam emitted by the laser light source is incident to the spot dissipation assembly, the rotating component can drive the spot dissipation assembly to rotate, the diffusion medium in the spot dissipation assembly moves accordingly, the spot dissipation effect on the laser beam can be enhanced, and therefore the speckle phenomenon of the light source device can be effectively weakened.
To sum up, the embodiment of the present application provides a control method for a light source device, when a timing control signal indicates to output a laser beam, a rotating component may drive a transparent container to rotate, so that a diffusion medium in the transparent container moves therewith, and thus coherence of the laser beam passing through the diffusion medium may be effectively reduced, speckle phenomenon of the laser beam may be weakened, a problem of poor speckle elimination effect of a speckle elimination assembly in related technologies may be solved, and an effect of effectively suppressing the speckle phenomenon may be achieved.
Fig. 14 is a flowchart of another control method of a light source device provided in this embodiment, and the method may be applied to a light source device in which the light-transmitting container in the speckle reduction assembly provided in the above embodiment has an annular chamber, and optionally, the laser light source includes at least a first laser for emitting laser light of a first color and a second laser for emitting laser light of a second color. The method comprises the following steps:
The method provided by the embodiment of the application can be applied to a control component in the light source device, and the control component can receive the timing control signal and control each part in the light source device based on the timing control signal.
The wavelength of the laser beam is in direct proportion to the rotating speed of the speckle reduction assembly, the laser beams with different wavelengths can correspond to different rotating speeds of the speckle reduction assembly, the rotating speed of the corresponding speckle reduction assembly can be higher for the laser beam with longer wavelength so as to achieve a better speckle reduction effect, and the first rotating speed is the rotating speed of the speckle reduction assembly corresponding to the wavelength of the first color laser beam.
The control component may control a rotation speed of the speckle reduction component (for example, the speckle reduction component includes a rotating component and a light-transmitting container containing a diffusion medium, and then the control component may control the rotating component to rotate, so as to drive the light-transmitting container containing the diffusion medium to rotate), so that after the first laser is turned on, when the laser of the first color emitted by the first laser enters the speckle reduction component, the rotation speed of the speckle reduction component is a first rotation speed.
After the laser light source is started, a first-color laser beam emitted by the laser light source is incident to the spot dissipation assembly, and the rotating component can drive the spot dissipation assembly to rotate at a first rotating speed, so that the diffusion medium in the spot dissipation assembly continuously and randomly changes. When the speckle eliminating component rotates at the first rotating speed, the speckle eliminating effect on the first color laser beam can be enhanced, so that the speckle phenomenon of the light source device can be effectively weakened.
And step 1003, when the timing control signal indicates to output the laser with the second color, starting a second laser, and controlling the rotating part to drive the speckle eliminating assembly to rotate at a second rotating speed.
The second rotational speed is the rotational speed of the speckle reduction assembly corresponding to the second color laser beam wavelength.
The control component can control the rotation speed of the spot dissipation component, so that after the second laser is started, when the laser of the second color emitted by the second laser is incident to the spot dissipation component, the rotation speed of the spot dissipation component is the second rotation speed.
After the laser light source is started, the second color laser beam emitted by the laser light source is incident to the spot dissipation assembly, and the rotating component can drive the spot dissipation assembly to rotate at a second rotating speed, so that the diffusion medium in the spot dissipation assembly continuously and randomly changes. When the speckle dissipating assembly rotates at the second rotating speed, the speckle dissipating effect on the second color laser beam can be enhanced, so that the speckle phenomenon of the light source device can be effectively reduced.
As shown in fig. 15, fig. 15 is a flowchart of another control method of a light source device provided in this embodiment, which may be applied to the light source device in which the light-transmitting container in the spot dissipation assembly provided in the above embodiment has at least two chambers, and optionally, the laser light source includes at least a first laser for emitting laser light of a first color and a second laser for emitting laser light of a second color, and the light-transmitting container in the light source device has at least two chambers, and the at least two chambers include a first chamber corresponding to the laser light of the first color and a second chamber corresponding to the laser light of the second color. The method may include the following steps:
The method provided by the embodiment of the application can be applied to a control component in the light source device, and the control component can receive the timing control signal and control each component in the light source device based on the timing control signal.
The laser beams with different wavelengths can correspond to different diffusion media in the speckle elimination assembly to achieve a better speckle elimination effect, and the diffusion media accommodated in the first chamber of the speckle elimination assembly are the diffusion media corresponding to the wavelength of the first-color laser beam.
The control component can control the speckle elimination component, so that after the first laser is started, the first color laser emitted by the first laser can be incident to a first chamber in the speckle elimination component, and a first diffusion medium is accommodated in the first chamber and used for carrying out speckle elimination treatment on the first color laser beam, so that the speckle phenomenon of the light source device can be effectively weakened.
The diffusion medium accommodated in the second chamber of the speckle reduction assembly is a diffusion medium corresponding to the wavelength of the second color laser beam.
The control component can control the speckle elimination component, so that after the second laser is started, the second color laser emitted by the second laser can be incident to a second chamber in the speckle elimination component, and a second diffusion medium is accommodated in the second chamber and used for carrying out speckle elimination treatment on the second color laser beam, so that the speckle phenomenon of the light source device can be effectively reduced.
To sum up, the embodiment of the present application provides a control method for a light source device, when a timing control signal indicates to output a laser beam, a rotating component may drive a transparent container to rotate, so that a diffusion medium in the transparent container moves therewith, and thus coherence of the laser beam passing through the diffusion medium may be effectively reduced, so as to weaken speckle phenomenon of the laser beam, and thus, a problem of poor speckle elimination effect of a speckle elimination assembly in related technologies may be solved, and an effect of effectively suppressing the speckle phenomenon is achieved.
In this application, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A speckle-dissipating assembly comprising a light-transmissive container, a diffusion medium, and a rotating member;
the diffusion medium is positioned in the light-transmitting container, and the light-transmitting container is connected with the rotating part;
the light-transmitting container is provided with at least two chambers, different diffusion media are accommodated in the at least two chambers, and the different diffusion media correspond to laser beams with different wavelengths;
the diffusion medium is a solid-liquid mixture medium, and the diffusion capacity of the solid-liquid mixture medium to the laser beam is positively correlated with the number of solid spherical particles in unit volume of the solid-liquid mixture medium.
2. The plaque dissipating assembly of claim 1 wherein the light transmissive container has an annular chamber and the diffusion medium is located in the annular chamber.
3. The plaque dissipating assembly of claim 1 wherein the at least two chambers are arranged about the rotational axis of the rotating member;
alternatively, the at least two chambers are arranged in a direction away from the rotational axis of the rotating member.
4. The speckle dissipating assembly of claim 3, wherein the at least two chambers are each fan-shaped in cross-section taken by a first plane, the first plane being perpendicular to the axis of rotation of the rotating member and intersecting the light transmissive container.
5. The plaque dissipating assembly of claim 1 wherein the liquid medium of the solid-liquid mixture medium comprises water, an inorganic salt solution, an aqueous organic alcohol solution, or a transparent organic solution and the solids of the solid-liquid mixture medium comprise inorganic compounds or transparent organic spherical particles.
6. The speckle dissipating assembly of any of claims 1-4, wherein the light transmissive container has an anti-reflective coating formed thereon;
or an antireflection film is formed on one side of the light-transmitting container close to the laser light source, and a reflecting film is formed on one side of the light-transmitting container far away from the laser light source.
7. A light source device, comprising a laser light source, a light path component, and the speckle dissipating component of any one of claims 1-6, arranged in sequence along a light path.
8. A control method for a light source device according to claim 7, the method comprising:
receiving a timing control signal;
and controlling a laser light source in the light source device to be started according to the time sequence control signal, and controlling a rotating part in the light source device to drive the speckle dispersing component to rotate.
9. The method of claim 8, wherein the laser light source comprises at least a first laser for emitting laser light of a first color and a second laser for emitting laser light of a second color;
the laser light source in the light source device is controlled to be started according to the time sequence control signal, and a rotating part in the light source device is controlled to drive the speckle eliminating assembly to rotate, and the method comprises the following steps:
when the timing control signal indicates to output the first color laser, starting the first laser, and controlling the rotating component to drive the speckle eliminating assembly to rotate at a first rotating speed;
and when the time sequence control signal indicates that the laser of the second color is output, the second laser is started, and the rotating part is controlled to drive the speckle eliminating assembly to rotate at a second rotating speed.
10. The method according to claim 8, wherein the laser light source comprises at least a first laser for emitting a first color laser and a second laser for emitting a second color laser, the light-transmissive container in the light source device has at least two chambers, the at least two chambers comprise a first chamber corresponding to the first color laser and a second chamber corresponding to the second color laser;
the laser light source in the light source device is controlled to be started according to the time sequence control signal, and a rotating part in the light source device is controlled to drive the speckle eliminating assembly to rotate, and the method comprises the following steps:
when the timing control signal indicates that the first-color laser is output, the first laser is started, and the rotating part is controlled to drive the speckle dissipating component to rotate, so that the first-color laser emitted by the first laser irradiates the first chamber;
and when the timing control signal indicates that the second-color laser is output, the second laser is started, and the rotating part is controlled to drive the speckle dispersing component to rotate, so that the second-color laser emitted by the second laser irradiates the second cavity.
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| CN202110381875.0A CN113093398B (en) | 2021-04-09 | 2021-04-09 | Speckle eliminating assembly, light source device and control method of light source device |
| PCT/CN2022/082629 WO2022213808A1 (en) | 2021-04-09 | 2022-03-24 | Speckle-eliminating assembly, light source device, and control method for light source device |
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| JP2020187253A (en) * | 2019-05-14 | 2020-11-19 | パナソニックＩｐマネジメント株式会社 | Speckle suppression device, and projection device |
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| JP2009244590A (en) * | 2008-03-31 | 2009-10-22 | Panasonic Corp | Light source device for removing speckle noise |
| JP6402893B2 (en) * | 2013-05-30 | 2018-10-10 | カシオ計算機株式会社 | Optical wheel device and projection device |
| CN105093794B (en) * | 2015-06-03 | 2017-02-01 | 海信集团有限公司 | Double-color laser light source |
| CN108287449B (en) * | 2015-12-18 | 2020-03-24 | 海信集团有限公司 | Color wheel |
| JP2018072570A (en) * | 2016-10-28 | 2018-05-10 | リコーインダストリアルソリューションズ株式会社 | Speckle cancellation element and speckle cancellation mechanism |
| CN108398804B (en) * | 2018-03-28 | 2023-07-25 | 四川长虹电器股份有限公司 | Laser speckle eliminating light path and laser projection light source system |
| CN109358468A (en) * | 2018-11-30 | 2019-02-19 | 青岛海信激光显示股份有限公司 | A kind of laser light source drive control method and laser projection display method |
| CN112147836B (en) * | 2019-06-28 | 2023-08-04 | 深圳光峰科技股份有限公司 | Light source system and display device |
| CN110737167B (en) * | 2019-10-30 | 2022-04-05 | 无锡视美乐激光显示科技有限公司 | Laser fluorescent light source and projector |
| CN113093398B (en) * | 2021-04-09 | 2023-01-06 | 青岛海信激光显示股份有限公司 | Speckle eliminating assembly, light source device and control method of light source device |
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| JP2020187253A (en) * | 2019-05-14 | 2020-11-19 | パナソニックＩｐマネジメント株式会社 | Speckle suppression device, and projection device |
| CN110361919A (en) * | 2019-07-26 | 2019-10-22 | 四川长虹电器股份有限公司 | A kind of three color laser light sources with compound colour wheel |
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