CN101644880B - Laser light projection display system and method thereof - Google Patents
Laser light projection display system and method thereof Download PDFInfo
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- CN101644880B CN101644880B CN2009101703696A CN200910170369A CN101644880B CN 101644880 B CN101644880 B CN 101644880B CN 2009101703696 A CN2009101703696 A CN 2009101703696A CN 200910170369 A CN200910170369 A CN 200910170369A CN 101644880 B CN101644880 B CN 101644880B
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Abstract
The invention provides a laser light projection display system, comprising a laser used for generating laser light; a light-coupled device used for coupling the laser light to a plurality of fiber bundles; an optical fiber spatial phase modulator comprising a piezoelectric ceramic rod on which the plurality of fiber bundles wind different circles so that when a high frequency alternating voltage is applied to the piezoelectric ceramic rod, the plurality of fiber bundles generate different phase variations; an expanded beam lens group used for expanding light beams; a shaping shimming device used for shaping and shimming the light beams, so as to lead the light beams to have a predetermined shape; a linear spatial light modulator used for generating an image; a spatial polarization modulator comprising a twisted nematic liquid crystal layer which is applied to a fast changed voltage with a random spatial distribution so as to enable a polarization state of each pixel of the image to change fast; and a projection lens component used for projecting the image on a screen. The invention also provides a corresponding laser light projection display method.
Description
Technical field
The present invention relates to laser projection and show the field, relate to a kind of laser light projection display system and method thereof that suppresses speckle based on space phase modulation and space Polarization Modulation especially.
Background technology
Have advantages such as color-resolution height, color saturation height, colourity triangle colour gamut are big, high brightness as the display system of light source with laser, therefore the high quality graphic that can realize giant-screen and miniature portable projection shows, is the developing direction of the display technique of a new generation.But because the high coherence of LASER Light Source, laser light projection display system easily produces speckle effect.The generation reason of speckle comprises two aspects, and first aspect is the coherence stack that results from optical surface scattering subwave in the projecting light path, and second aspect is to result from the subjective speckle that the coherent light of projection screen scattering forms in human eye.Speckle is present in the image as noise, can have a strong impact on the quality of image, causes image resolution ratio to descend.
The method of eliminate laser speckle typically uses phase modulation component at present.Static phase modulation component is also not obvious to the inhibition of speckle vision, so usually by rotation or periodically mobile these phase modulation components, to produce dynamic speckle, utilize speckle effect equalization to reduce the speckle vision.But because the rotation of phase modulation (PM) original paper or vibration need high-frequency electric machines to drive usually, therefore system's instability is arranged usually, produce shortcomings such as noise, optical loss height, thereby the effect that causes eliminating speckle not desirable especially.
Therefore, thus a kind of simple controllable, stable high and low loss need be provided and need not mechanical motion, constitutionally stable speckle cancellation element overcomes the deficiencies in the prior art, realizes high-quality laser display.
Summary of the invention
In order one of to solve the problems of the technologies described above, the present invention proposes a kind of laser light projection display system that uses dynamic spatial phase modulation and space polarization Modulation to suppress speckle.Spatial phase modulation can realize dynamic space phase modulation, realizes simple controllable, stability height, if coupling technique improves, can realize the low-loss of light.Space polarization state modulation technique need not mechanical motion, Stability Analysis of Structures, can further weaken speckle.
The present invention proposes a kind of laser light projection display system, comprising: laser instrument is used to produce laser; Light Coupled Device is used for laser coupled to a plurality of fibre bundles; Optical fiber space phase modulator comprises: piezoelectric ceramics rod, described multifiber bundle twine the different number of turns on described piezoelectric ceramics rod, so that when high-frequency ac voltage was applied to described piezoelectric ceramics rod, described multifiber bundle produced different phase change; The extender lens group is used for light beam is expanded bundle; The shaping shimming device is used for light beam is carried out shaping and shimming, so that light beam evenly and have a predetermined shape; The linear space photomodulator is used to produce image; Space Polarization Modulation device comprises the stable twisted nematic liquid crystal layer; This stable twisted nematic liquid crystal layer is applied in that space distribution is at random, fast-changing voltage, so that the polarization state of each pixel of image changes fast; The projecting lens assembly is used to project image onto screen.
The invention allows for a kind of laser projection display method, described method comprises the steps: to produce LASER Light Source by laser instrument; With laser coupled in a plurality of fibre bundles; Described multifiber bundle is wrapped on the piezoelectric ceramics rod with the different number of turns, so that when high-frequency ac voltage was applied to described piezoelectric ceramics rod, described multifiber neutron light produced different phase change; Light beam is expanded bundle; Light beam is carried out shaping and shimming, so that light beam evenly and have a predetermined shape; Produce image according to fibre bundle; On a stable twisted nematic liquid crystal layer, apply at random, fast-changing voltage, so that the polarization state of each pixel of image changes fast; Project image onto on the screen.
Use laser light projection display system of the present invention and display packing thereof and avoided adopting the speckle cancellation element of complex structure and poor controllability, need not to adopt mechanical motion, overcome the deficiencies in the prior art thereby just can eliminate speckle, realize high-quality laser display.
In order more completely to understand the present invention and advantage thereof, the specific embodiment of the present invention is described now in conjunction with the accompanying drawings, reference marker identical in the accompanying drawing is represented similar implication, wherein:
Fig. 1 is the synoptic diagram of laser light projection display system according to a particular embodiment of the invention;
Fig. 2 shows in the laser light projection display system of the specific embodiment according to the present invention piezoelectric ceramics as the synoptic diagram of space phase modulator;
Fig. 3 shows the synoptic diagram of fly's-eye lens as the shaping shimming device;
Description of drawings
Fig. 4 shows the cross sectional representation of fibre bundle incident end and exit end;
Fig. 5 a shows the synoptic diagram of space light polarization modulator spare and linear space photomodulator in the laser light projection display system;
Fig. 5 b shows space Polarization Modulation device and the LCD synoptic diagram as the linear space photomodulator;
Fig. 6 shows in the laser light projection display system liquid crystal panel and modulates the alive synoptic diagram of each pixel outgoing polarization state each pixel of liquid crystal layer as space Polarization Modulation device;
Fig. 7 shows laser light projection display system according to another embodiment of the present invention.
Describe the specific embodiment of the present invention in detail below in conjunction with accompanying drawing.As shown in Figure 1, the laser light projection display system according to the first embodiment of the present invention comprises: laser instrument 11 is used to produce LASER Light Source; Light Coupled Device 12 is used for laser coupled to a plurality of fibre bundles; Optical fiber space phase modulator 13, be used to a plurality of optical fiber neutron light additional different, in time with the random phase of spatial variations, comprise: the piezoelectric ceramics rod, the multifiber bundle twines the different number of turns on the piezoelectric ceramics rod, so that when high-frequency ac voltage was applied to the piezoelectric ceramics rod, the multifiber bundle produced different phase change; Extender lens group 14 is used for light beam is expanded bundle; Shaping shimming device 15 is used for light beam is carried out shaping and shimming, so that light beam evenly and have a predetermined shape; Linear space photomodulator 16 is used to produce image; Space Polarization Modulation device 22 is used for each pixel outgoing polarization state of light of image that dynamic modulation produces, changes so that the outgoing polarization state of light of each pixel produces fast, comprises the stable twisted nematic liquid crystal layer; This stable twisted nematic liquid crystal layer is applied in that space distribution is at random, fast-changing voltage, so that the polarization state of each pixel of image changes fast; Projecting lens assembly 17 is used to project image onto screen.
Laser instrument 11 can be that the laser beam that a plurality of laser instruments send different colours is closed bundle then earlier, passes through optical projection system again.Also can be three laser instruments, remerge the generation coloured image after producing the red, green, blue image separately.Laser instrument can be a kind of in solid-state laser, semiconductor laser and the gas laser.
Fig. 2 shows the basic structure of optical fiber space phase modulator 13 according to an embodiment of the invention.Wherein, use piezoelectric ceramics 20 to carry out the space phase modulation, many root multimode fibers 19 are wrapped on the bar-shaped piezoelectric ceramics 20, and every optical fiber is wrapped on the piezoelectric ceramics 20 with the different number of turns, and piezoelectric ceramics is applied in high-frequency ac voltage then.When being compared, laser is divided into a plurality of son bundles after being coupled in the optical fiber equably, because fibre bundle institute's pitch of the laps on piezoelectric ceramics is counted difference, after voltage changes, along with the variation with voltage of the shape of piezoelectric ceramics changes, each beamlet has changed different light paths, thereby obtains fast-changing PHASE DISTRIBUTION.
Use under the situation of multimode optical fiber in optical fiber space phase modulator 13, mode dispersion can reduce the coherence of light source to a certain extent.For eliminating light source coherence requirement is not that too high system also can use single thick core diameter multimode optical fiber multi-turn to be wrapped on the piezoelectric ceramics, by regulating the length of simple optical fiber, regulate wherein that the dispersion differences between the light field different mode produces the dynamic speckle image, reach the effect that suppresses speckle.Those skilled in the art will appreciate that the multimode optical fiber 19 for present embodiment also can adopt other similar structures, as waveguiding structure; Piezoelectric ceramics 20 also can adopt the device of other scalable fiber lengths, and these all do not break away from protection scope of the present invention.
Embodiment
Then, inject extender lens group 14 through the emergent light of phase change, the extender lens group can be made up of two different lens of focal length, and the front focal length of lens is little, and the back focal length of lens is big, and two lens focuss overlap, when light by the time will produce expansion Shu Xiaoguo.Original beam sizes and area are all less, and whole surface that can not the illumination optical element particularly is used for producing the surface of the linear space photomodulator of image, can address this problem after expanding bundle.The extender lens group also can use single lens to expand bundle herein, and the emergent light surface of optical fiber space phase modulator is placed on the front focal plane of single lens.
After this, expanded the emergent light of bundle and inject shaping shimming device 15, shaping shimming device 15 can also further be upset the PHASE DISTRIBUTION of laser beam except even light.Just as well known for one of skill in the art, shaping shimming device 15 can be a fly's-eye lens, and the array mirror lens perhaps is integrating rod, optical fiber etc.Make the light beam space distribution adjust again by this device, make it more even, and make light beam have predetermined shape, thereby improve light utilization efficiency.Fig. 3 shows and uses the synoptic diagram of fly's-eye lens as the shaping shimming device, and wherein 29 lenslet structure is fly's-eye lens shimming structure, the optical field distribution after obtaining shimming on the interface 30.
Fig. 4 is the cross sectional representation of fibre bundle incident end and exit end.Multimode optical fiber incident and exit end are lined up tight structure as shown in the figure, are convenient to coupling and outgoing shimming.The end face of fibre bundle also can be made special shape, to increase coupling efficiency.
Fig. 5 (a) shows the synoptic diagram of space light polarization modulator spare and linear space photomodulator in the laser light projection display system of present embodiment.21 is the linear space photomodulator in Fig. 5 (a), and linear space photomodulator 21 can be LCD, DLP, a kind of among the LCoS.
According to one embodiment of present invention, be provided with space Polarization Modulation device 22 on the surface of linear spatial light modulator 21.Space Polarization Modulation device 22 can be the stable twisted nematic liquid crystal layer.Fig. 5 (b) is that linear space photomodulator 21 is that LCD and space Polarization Modulation device 22 are the concrete structure under the situation of stable twisted nematic liquid crystal layer 22 ', as shown in the figure, linear space photomodulator 21 comprises light polarizing film 23, stable twisted nematic liquid crystal layer 24 and light polarizing film 25.22 ' is the stable twisted nematic liquid crystal layer.23,24,25 form common liquid crystal panel structure, are used to produce image.Twisted nematic liquid crystal layer 22 ' is used to modulate each pixel outgoing polarization state of light.
As shown in Figure 6, in order to modulate each pixel outgoing polarization state of light, Fig. 6 has provided the synoptic diagram that applies its polarization state of Control of Voltage for stable twisted nematic liquid crystal layer 22 ' each pixel.Character with reference to liquid crystal, when twisted nematic liquid crystal layer 22 ' institute's making alive changes within the specific limits, the outgoing polarization state of light is changing, thereby can in this voltage range, produce at random on each pixel that a plurality of voltages are added in stable twisted nematic liquid crystal layer 22 ', and apace, constantly independently change voltage V1, V2...Vn at random, wherein n is the liquid crystal pixel number of hypothesis.Thereby make the polarization state of each pixel of image be at random and along with the time changes at a high speed, and then produce dynamic speckle, when the variation of speckle faster than the response speed of human eye when (generally being about 30ms), what human eye was seen is exactly the average effect of dynamic speckle, thereby suppresses the speckle of the relevant generation between the different pixels.
According to another embodiment of the invention, space Polarization Modulation device 22 can realize in the following manner that promptly space Polarization Modulation device 22 can comprise lens 26 and twisted nematic liquid crystal layer 28.Shown in Fig. 7, described lens 26 place from the light path of the outgoing of linear space optical modulation device, place twisted nematic liquid crystal layer 28 on the image planes of lens 26 imagings.Project projection lens set with twisted nematic liquid crystal layer 28 place face as image planes.
Although described the present invention and advantage thereof in detail, should be appreciated that under the situation that does not deviate from the spirit and scope of the present invention defined by the appended claims, can carry out various variations, replacement and transformation.In addition, do not mean that the application's scope is limited to the specific embodiment of technology, equipment, manufacturing and material composition, means, method and the step described in the instructions.Those skilled in the art will be easy to recognize technology, equipment, manufacturing, material composition, means, method or step that those exist now or that find later from disclosure of the present invention, and it is with described herein corresponding embodiment is employed according to the present invention finishes substantially the same function or reach substantially the same result.Therefore, the appended claim of expectation is included in such technology, equipment, manufacturing, material composition, means, method or step in their scope.In addition, each claim constitutes an independent embodiment, and the combination of different claim and embodiment also falls within the scope of protection of the present invention.
Claims (6)
1. laser light projection display system comprises:
Laser instrument is used to produce laser;
Light Coupled Device is used for laser coupled to a plurality of fibre bundles;
Optical fiber space phase modulator comprises: piezoelectric ceramics rod, described multifiber bundle twine the different number of turns on described piezoelectric ceramics rod, so that when high-frequency ac voltage was applied to described piezoelectric ceramics rod, described multifiber bundle produced different phase change;
The extender lens group is used for light beam is expanded bundle;
The shaping shimming device is used for light beam is carried out shaping and shimming, so that light beam evenly and have a predetermined shape;
The linear space photomodulator is used to produce image;
Space Polarization Modulation device comprises the stable twisted nematic liquid crystal layer; This stable twisted nematic liquid crystal layer is applied in that space distribution is at random, fast-changing voltage, so that the polarization state of each pixel of image changes fast;
The projecting lens assembly is used to project image onto screen.
2. laser light projection display system according to claim 1, wherein said fibre bundle are multimode optical fiber or single-mode fiber boundling.
3. laser light projection display system according to claim 1, wherein said linear space photomodulator are a kind of among LCD, DLP or the LCoS.
4. laser projection display method, described method comprises the steps:
Produce LASER Light Source by laser instrument;
With laser coupled in a plurality of fibre bundles;
Described multifiber bundle is wrapped on the piezoelectric ceramics rod with the different number of turns, so that when high-frequency ac voltage was applied to described piezoelectric ceramics rod, described multifiber neutron light produced different phase change;
Light beam is expanded bundle;
Light beam is carried out shaping and shimming, so that light beam evenly and have a predetermined shape;
By the linear space photomodulator light beam is carried out spatial modulation and produce image;
On a stable twisted nematic liquid crystal layer, apply at random, fast-changing voltage, so that the polarization state of each pixel of image changes fast;
Project image onto on the screen.
5. laser projection display method according to claim 4, wherein said fibre bundle are multimode optical fiber or single-mode fiber.
6. laser projection display method according to claim 4, the step that wherein said fibre bundle emergent light produces image through the linear space photomodulator comprise and use a kind of as the linear space photomodulator among LCD, DLP or the LCoS.
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| CN102495478B (en) * | 2011-12-30 | 2014-08-13 | 中国科学技术大学 | Laser display speckle inhibition system based on polymer dispersed liquid crystal and method thereof |
| CN103777365A (en) * | 2012-10-24 | 2014-05-07 | 中国科学院光电研究院 | Laser projection display system and method |
| CN104252047A (en) * | 2013-06-26 | 2014-12-31 | Cq科技有限公司 | Laser projection system with speckle elimination function |
| CN104808352A (en) * | 2014-01-23 | 2015-07-29 | 中能激光显示技术（上海）有限公司 | Speckle inhibition method and apparatus |
| CN103916646A (en) * | 2014-04-29 | 2014-07-09 | 周毅 | Laser full-color display system |
| CN106597790B (en) * | 2016-12-22 | 2019-04-02 | 深圳市华星光电技术有限公司 | A kind of laser-projector display device |
| CN108415177B (en) * | 2018-02-27 | 2020-06-26 | 华侨大学 | Device and method for quantitatively controlling polarization degree of focus point of multimode fiber speckle field |
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| CN112445051A (en) * | 2019-08-30 | 2021-03-05 | 中强光电股份有限公司 | Lens module and projection device |
| CN113495410A (en) * | 2020-03-18 | 2021-10-12 | 深圳光峰科技股份有限公司 | Laser projection device |
| CN112858345B (en) * | 2021-01-22 | 2022-03-11 | 中国工程物理研究院激光聚变研究中心 | Random phase-shifting optical element defect rapid super-resolution detection device and detection method |
| CN113325657B (en) * | 2021-08-03 | 2021-11-30 | 杭州中科极光科技有限公司 | Projection system, projection display method and terminal equipment |
| CN113641063B (en) * | 2021-08-16 | 2023-12-08 | 深圳市火乐科技发展有限公司 | Dodging device, projector optical machine and projector |
| CN114200688A (en) * | 2021-12-21 | 2022-03-18 | 中国海洋大学 | Combined speckle suppression device and method |
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