CN111650808A - RGB pure laser direct-coupled projection system - Google Patents
RGB pure laser direct-coupled projection system Download PDFInfo
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- CN111650808A CN111650808A CN202010517754.XA CN202010517754A CN111650808A CN 111650808 A CN111650808 A CN 111650808A CN 202010517754 A CN202010517754 A CN 202010517754A CN 111650808 A CN111650808 A CN 111650808A
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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
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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
-
- 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
- G03B21/2013—Plural light sources
-
- 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
-
- 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
Abstract
The invention relates to an RGB pure laser direct-coupled projection system, which comprises a laser light source, an optical coupler, a multimode optical fiber, a diffraction optical component and a light homogenizing component, wherein the optical coupler, the multimode optical fiber, the diffraction optical component and the light homogenizing component are sequentially arranged along a laser transmission path emitted by the laser light source; the laser light source emits tricolor laser; the optical coupler optically couples the incident three-primary-color laser light to the multimode optical fiber; the multimode optical fiber transmits incident three-primary-color laser to the diffraction optical component; the diffraction optical component receives the three-primary-color laser emitted by the multimode fiber and reconstructs the wave front of the three-primary-color laser, and the phase part of the wave front of the three-primary-color laser deviates and emits the three-primary-color laser to the light uniformizing component; the light homogenizing component homogenizes and transmits incident three-primary-color laser. Compared with the prior art, the invention can simultaneously reduce the time coherence and the space coherence of the three-primary-color laser and effectively inhibit speckles generated by the laser.
Description
Technical Field
The invention relates to the technical field of laser projection, in particular to an RGB pure laser direct-coupled projection system.
Background
The primary color laser projector comprises a semiconductor laser (blue DLP, green DLP and red DLP), wherein laser emitted by the semiconductor laser enters an optical machine after being subjected to beam expanding, shimming, decoherence and the like, the optical machine modulates incident light beams and outputs the modulated incident light beams to a projection lens, and finally the modulated incident light beams are projected onto a screen to form a projection image.
The laser has high coherence and light beams with different amplitudes and phases, and granular speckles-laser speckles which are randomly distributed are formed at each point in space. Laser speckle, a random process, is an objective physical phenomenon that inevitably exists with the use of lasers. Laser speckle not only causes energy loss, but also becomes a main factor limiting image quality and reducing image resolution and contrast
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, an object of the present invention is to provide an RGB pure laser direct-coupled projection system capable of simultaneously reducing temporal coherence and spatial coherence of three primary color laser and effectively suppressing speckle generated by the laser.
The technical scheme for solving the technical problems is as follows: an RGB pure laser direct-coupled projection system comprises a laser light source, an optical coupler, a multimode optical fiber, a diffraction optical component and a light homogenizing component, wherein the optical coupler, the multimode optical fiber, the diffraction optical component and the light homogenizing component are sequentially arranged along a laser transmission path emitted by the laser light source;
the laser light source emits tricolor laser; the optical coupler optically couples the incident three-primary-color laser light to the multimode optical fiber; the multimode optical fiber transmits incident three-primary-color laser to the diffraction optical component; the diffraction optical component receives the three-primary-color laser emitted by the multimode fiber and reconstructs the wave front of the three-primary-color laser, and the phase part of the wave front of the three-primary-color laser deviates and emits the three-primary-color laser to the light uniformizing component; the light homogenizing component homogenizes and transmits incident three-primary-color laser.
The invention has the beneficial effects that: three primary colors laser passing through the multimode fiber can generate random propagation time change, so that the time coherence of the laser is destroyed; the diffraction optical component reduces the spatial coherence of the three-primary-color laser, can simultaneously reduce the temporal coherence and the spatial coherence of the three-primary-color laser, and effectively inhibits speckles generated by the laser.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the laser light source comprises a red laser, a green laser and a blue laser, the red laser emits red laser, the green laser emits green laser, the blue laser emits blue laser, and the red laser, the green laser and the blue laser are emitted to the optical coupler to be coupled.
Furthermore, the input port and the output port of the multimode optical fiber are both plated with AR films.
Furthermore, one end of the multimode optical fiber is provided with a driver, and the driver is connected with the multimode optical fiber; the driver drives the multimode optical fiber to vibrate.
The beneficial effect of adopting the further scheme is that: the driver can drive the multimode fiber to vibrate periodically, so that the tricolor laser in the multimode fiber generates random propagation time change, thereby reducing the time coherence of the tricolor laser.
The projection device comprises a light valve modulation component, a projection lens and a projection screen, wherein the light valve modulation component is arranged on a transmission path of laser emitted by the light uniformizing component, the projection lens is arranged on the transmission path of the laser emitted by the light valve modulation component, and the projection screen is arranged at a set distance from the light emitting side of the projection lens;
the light valve modulation component modulates the three-primary-color laser and projects the modulated three-primary-color laser to a projection screen through a projection lens.
The fluorescent imaging device is detachably arranged between the projection lens and the projection screen and is close to the projection lens; the signal input end of the control device is connected with the signal output end of the fluorescence imaging device, and the signal output end of the control device is connected with the driver;
the projection lens projects laser onto the fluorescence imaging device, and the fluorescence imaging device receives the laser, generates image information and transmits the image information to the control device; the control device forms a Gaussian distribution image containing speckles according to the image information, wherein the speckles represent high-frequency noise; and calculating speckle contrast after processing the Gaussian distribution image, generating a voltage regulating signal according to the speckle contrast, and transmitting the voltage regulating signal to a driver, wherein the driver regulates the vibration frequency of the multimode optical fiber.
The beneficial effect of adopting the further scheme is that: the fluorescence can automatically adjust the vibration frequency of the multimode fiber, thereby automatically reducing the time coherence of the tricolor laser; the projection is higher in definition, energy-saving and long in service life; the limitation on the playing field is less, and the installation is easy; the intelligent software support, the operation is simple and easy, and the cost performance is high.
Further, the processing of the gaussian distribution image by the control device specifically includes: and performing three-dimensional Gaussian fitting on the Gaussian distribution image to obtain energy distribution, and normalizing the intensity of each pixel point after Gaussian fitting to obtain a uniform image containing noise.
Further, the calculating the speckle contrast by the control device specifically comprises:
wherein the content of the first and second substances,
the speckle contrast is represented by the intensity of the light,
which represents the standard deviation of the light intensity,
representing the mean value of the light intensity.
Further, the control device judges whether the speckle contrast exceeds a set threshold value, and generates a voltage regulating signal to be transmitted to the driver when the speckle contrast exceeds the set threshold value;
the driver detects the vibration speed of the driver by using a vibration sensor arranged in the driver; and the input voltage is adjusted according to the voltage regulating signal, and the driver adjusts the operating frequency.
The beneficial effect of adopting the further scheme is that: the vibration frequency of the multimode fiber is automatically adjusted, so that the three primary colors of laser in the multimode fiber generate random propagation time change, and the time coherence of the three primary colors of laser is reduced.
Drawings
Fig. 1 is a schematic diagram of an RGB pure laser direct-coupled projection system according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a laser light source, 2, an optical coupler, 3, a multimode optical fiber, 4, a diffraction optical component, 5, a light homogenizing component, 6, a driver, 7, a light valve modulation component, 8, a projection lens, 9, a projection screen, 10, a fluorescence imaging device, 11 and a control device.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, an RGB pure laser direct-coupled projection system includes a laser light source 1, an optical coupler 2, a multimode optical fiber 3, a diffractive optical component 4, and a light uniformizing component 5, where the optical coupler 2, the multimode optical fiber 3, the diffractive optical component 4, and the light uniformizing component 5 are sequentially arranged along a laser transmission path emitted by the laser light source 1;
wherein, the laser light source 1 emits tricolor laser; the optical coupler 2 optically couples the incident three-primary-color laser light to the multimode optical fiber 3; the multimode optical fiber 3 transmits the incident three-primary-color laser to the diffractive optical component 4; the diffraction optical component 4 receives the three-primary-color laser emitted by the multimode fiber 3, reconstructs the wave front of the three-primary-color laser, and the phase part of the wave front of the three-primary-color laser deviates and emits the three-primary-color laser to the light uniformizing component 5; the light uniformizing part 5 performs uniform transmission on the incident three-primary-color laser light.
Tricolor laser emitted by the laser light source 1 is coupled into the multimode fiber 3 through the optical coupler 2 and transmitted, and the tricolor laser passing through the multimode fiber 3 can generate random propagation time change, so that the time coherence of the laser is destroyed; then the three-primary-color laser passes through the diffraction optical component 4, the diffraction optical component 4 reduces the spatial coherence of the three-primary-color laser, and the three-primary-color laser with low temporal coherence and low spatial coherence and zero coherent speckles is emitted to the light uniformizing component 5 for uniform transmission.
In the above embodiment, the laser light source 1 is a red laser, a green laser, and a blue laser, the red laser emits a red laser, the green laser emits a green laser, and the blue laser emits a blue laser, and the red laser, the green laser, and the blue laser are emitted to the optical coupler 2 to be coupled.
In the above embodiment, the input port and the output port of the multimode fiber 3 are both coated with AR films.
In the above embodiment, one end of the multimode optical fiber 3 is provided with the driver 6, and the driver 6 is connected with the multimode optical fiber 3; the driver 6 drives the multimode optical fiber 3 to vibrate.
The driver 6 is a vibration motor and can drive the multimode fiber 3 to vibrate periodically, so that the three-primary-color laser in the multimode fiber 3 generates random propagation time variation, and the time coherence of the three-primary-color laser is reduced.
In the above embodiment, the device further includes a light valve modulation component 7, a projection lens 8 and a projection screen 9, where the light valve modulation component 7 is disposed on a transmission path of laser emitted by the dodging component 5, the projection lens 8 is disposed on a transmission path of laser emitted by the light valve modulation component 7, and the projection screen 9 is disposed at a set distance from a light emitting side of the projection lens 8;
the light valve modulation component 7 modulates the three-primary-color laser, and projects the modulated three-primary-color laser to a projection screen 9 through a projection lens 8.
Through the coordinated operation of light valve modulating part 7, projection lens 8 and projection screen 9, can carry out the projection with three primary colors laser, the projection image is meticulous, is applicable to stage design, large-scale studio and stadium, city building advertiser, large-scale amusement place, interactive experience shop, museum etc. carry out performance live broadcast place scientific and technological experience and upgrade.
In the above embodiment, the apparatus further comprises a fluorescence imaging device 10 and a control device 11, wherein the fluorescence imaging device 10 is detachably disposed between the projection lens 8 and the projection screen 9, and is close to the projection lens 8; the signal input end of the control device 11 is connected with the signal output end of the fluorescence imaging device 10, and the signal output end of the control device 11 is connected with the driver 6;
the projection lens 8 projects laser onto a fluorescence imaging device 10, and the fluorescence imaging device 10 receives the laser, generates image information and transmits the image information to a control device 11; the control device 11 forms a Gaussian distribution image containing speckles according to the image information, wherein the speckles represent high-frequency noise; and calculating the speckle contrast after processing the Gaussian distribution image, generating a voltage regulating signal according to the speckle contrast, and transmitting the voltage regulating signal to the driver 6, wherein the driver 6 regulates the vibration frequency of the multimode optical fiber 3.
The fluorescent imaging device 10, the control device 11 and the driver 6 are coordinated to operate, and the vibration frequency of the multimode optical fiber 3 can be automatically adjusted, so that the time coherence of the three primary colors of laser is automatically reduced; the projection is higher in definition, energy-saving and long in service life; the limitation on the playing field is less, and the installation is easy; the intelligent software support, the operation is simple and easy, and the cost performance is high.
In the above embodiment, the processing of the gaussian distribution image by the control device 11 specifically includes: and performing three-dimensional Gaussian fitting on the Gaussian distribution image to obtain energy distribution, and normalizing the intensity of each pixel point after Gaussian fitting to obtain a uniform image containing noise.
In the above embodiment, the calculating the speckle contrast by the control device 11 specifically includes:
wherein the content of the first and second substances,
the speckle contrast is represented by the intensity of the light,
which represents the standard deviation of the light intensity,
representing the mean value of the light intensity.
In the above embodiment, the control device 11 determines whether the speckle contrast exceeds a set threshold, and generates a voltage regulating signal to transmit to the driver 6 when the speckle contrast exceeds the set threshold;
the driver 6 detects the vibration speed of the driver 6 by using a vibration sensor provided therein; and adjusts the input voltage according to the voltage adjustment signal, and the driver 6 adjusts the operating frequency.
The control device 11 automatically adjusts the vibration frequency of the multimode fiber 3 by controlling the driver 6, so that the three primary colors laser in the multimode fiber 3 generates random propagation time variation, thereby reducing the time coherence of the three primary colors laser.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The utility model provides a pure laser direct-coupled projection system of RGB which characterized in that: the optical coupler (2), the multimode optical fiber (3), the diffractive optical component (4) and the light homogenizing component (5) are sequentially arranged along a laser transmission path emitted by the laser light source (1);
wherein the laser light source (1) emits tricolor laser light; the optical coupler (2) optically couples the incident three-primary-color laser light to the multimode optical fiber (3); the multimode optical fiber (3) transmits incident three-primary-color laser to the diffraction optical component (4); the diffractive optical component (4) receives the three-primary-color laser emitted by the multimode fiber (3), reconstructs the wave front of the three-primary-color laser, and the phase part of the wave front of the three-primary-color laser deviates and emits the three-primary-color laser to the light uniformizing component (5); the light homogenizing component (5) homogenizes and transmits incident three-primary-color laser light.
2. The RGB pure laser direct-coupled projection system of claim 1, wherein: the laser light source (1) is a red laser, a green laser and a blue laser, the red laser emits red laser, the green laser emits green laser, the blue laser emits blue laser, and the red laser, the green laser and the blue laser are emitted to the optical coupler (2) to be coupled.
3. The RGB pure laser direct-coupled projection system of claim 1, wherein: and the input port and the output port of the multimode optical fiber (3) are both plated with AR films.
4. The RGB pure laser direct-coupled projection system of claim 1, wherein: one end of the multimode optical fiber (3) is provided with a driver (6), and the driver (6) is connected with the multimode optical fiber (3); the driver (6) drives the multimode optical fiber (3) to vibrate.
5. The RGB pure laser direct-coupled projection system of claim 1, wherein: the light valve modulation component (7) is arranged on a transmission path of laser emitted by the light uniformizing component (5), the projection lens (8) is arranged on a transmission path of the laser emitted by the light valve modulation component (7), and the projection screen (9) is arranged at a set distance from the light emitting side of the projection lens (8);
the light valve modulation component (7) modulates the three-primary-color laser and projects the modulated three-primary-color laser to a projection screen (9) through a projection lens (8).
6. The RGB pure laser direct-coupled projection system according to any one of claims 1 to 5, wherein: the fluorescent imaging device (10) is detachably arranged between the projection lens (8) and the projection screen (9) and is close to the projection lens (8); the signal input end of the control device (11) is connected with the signal output end of the fluorescence imaging device (10), and the signal output end of the control device (11) is connected with the driver (6);
the projection lens (8) projects laser onto a fluorescence imaging device (10), and the fluorescence imaging device (10) receives the laser, generates image information and transmits the image information to the control device (11); the control device (11) forms a Gaussian distribution image containing speckles according to the image information, wherein the speckles are expressed as high-frequency noise; and calculating speckle contrast after processing the Gaussian distribution image, generating a voltage regulating signal according to the speckle contrast, and transmitting the voltage regulating signal to a driver (6), wherein the driver (6) regulates the vibration frequency of the multimode optical fiber (3).
7. The RGB pure laser direct-coupled projection system of claim 6, wherein: the processing of the gaussian-shaped distribution image by the control device (11) specifically comprises: and performing three-dimensional Gaussian fitting on the Gaussian distribution image to obtain energy distribution, and normalizing the intensity of each pixel point after Gaussian fitting to obtain a uniform image containing noise.
8. The RGB pure laser direct-coupled projection system of claim 7, wherein: the control device (11) calculates the speckle contrast specifically as follows:
wherein the content of the first and second substances,
the speckle contrast is represented by the intensity of the light,
which represents the standard deviation of the light intensity,
representing the mean value of the light intensity.
9. The RGB pure laser direct-coupled projection system of claim 6, wherein: the control device (11) judges whether the speckle contrast exceeds a set threshold value, and generates a voltage regulating signal to be transmitted to the driver (6) when the speckle contrast exceeds the set threshold value;
the driver (6) detects the vibration speed of the driver (6) by using a vibration sensor arranged in the driver; and adjusts the input voltage according to the voltage adjustment signal, the driver (6) adjusting the operating frequency.
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| CN202010517754.XA CN111650808A (en) | 2020-06-09 | 2020-06-09 | RGB pure laser direct-coupled projection system |
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| CN202010517754.XA CN111650808A (en) | 2020-06-09 | 2020-06-09 | RGB pure laser direct-coupled projection system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825831A (en) * | 2009-03-06 | 2010-09-08 | 上海三鑫科技发展有限公司 | Laser optical engine for micro projector |
| CN105158922A (en) * | 2015-10-09 | 2015-12-16 | 杭州虹视科技有限公司 | Laser device, laser display system, and laser projection system capable of eliminating speckles |
| US20180252863A1 (en) * | 2011-07-07 | 2018-09-06 | Reald Inc. | Despeckling devices and methods |
| CN109557680A (en) * | 2019-01-04 | 2019-04-02 | 浙江工业大学 | A kind of static laser speckle inhibition system of combination multimode lightguide and diffraction optical device |
| CN109900663A (en) * | 2017-12-11 | 2019-06-18 | 长光华大基因测序设备（长春）有限公司 | Laser light source speckle measurement method, speckle inhibit device and its parameter optimization method |
-
2020
- 2020-06-09 CN CN202010517754.XA patent/CN111650808A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825831A (en) * | 2009-03-06 | 2010-09-08 | 上海三鑫科技发展有限公司 | Laser optical engine for micro projector |
| US20180252863A1 (en) * | 2011-07-07 | 2018-09-06 | Reald Inc. | Despeckling devices and methods |
| CN105158922A (en) * | 2015-10-09 | 2015-12-16 | 杭州虹视科技有限公司 | Laser device, laser display system, and laser projection system capable of eliminating speckles |
| CN109900663A (en) * | 2017-12-11 | 2019-06-18 | 长光华大基因测序设备（长春）有限公司 | Laser light source speckle measurement method, speckle inhibit device and its parameter optimization method |
| CN109557680A (en) * | 2019-01-04 | 2019-04-02 | 浙江工业大学 | A kind of static laser speckle inhibition system of combination multimode lightguide and diffraction optical device |
Non-Patent Citations (1)
| Title |
|---|
| 王静、贺锋涛、曹金凤、朱玉晗、左波: "基于光纤振动的激光散斑抑制方法的研究", 《激光技术》 * |
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Application publication date: 20200911 |