CN202583679U - Laser display system based on electro-optical deflection speckle suppression - Google Patents
Laser display system based on electro-optical deflection speckle suppression Download PDFInfo
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- CN202583679U CN202583679U CN 201220221888 CN201220221888U CN202583679U CN 202583679 U CN202583679 U CN 202583679U CN 201220221888 CN201220221888 CN 201220221888 CN 201220221888 U CN201220221888 U CN 201220221888U CN 202583679 U CN202583679 U CN 202583679U
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Abstract
A laser display system based on electro-optical deflection speckle suppression comprises a laser for producing laser, a polarizer for producing linear polarized light in the specific polarization direction, an electro-optic deflector for deflecting light beams by utilizing electro-optical modulation, a long-focus convergent lens for converging the light beams, a scatter plate for scattering converged light beams and further reducing coherence of light fields, a light homogenizing module formed by a micro lens array, a light passing tube and a convergent lens jointly and used for collecting divergent light fields and reforming homogenized light, a linear spatial light modulator for producing images and a projecting lens assembly for projecting the images onto a screen. The laser display system based on the electro-optical deflection speckle suppression is simple, controllable, high in stability, low in loss and stable in structure, does not need mechanical motion and achieves high-quality laser display.
Description
Technical field
The utility model relates to the laser display field, particularly a kind of laser display system that suppresses speckle based on electrooptical deflection.
Background technology
The display system that with laser is light source has the color-resolution height, advantages such as color saturation is good, the colourity Delta Region big, high brightness; 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, laser light projection display system is prone to produce speckle effect.The generation of speckle comprises two aspects: 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 the scattering of projection screen 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 normally is utilized in the average effect of human eye several uncorrelated speckle of generation in integral time at present.Static modulator element is also not obvious to the inhibition of speckle vision, so adopt rotation or periodicity to move these modulator elements usually, to produce dynamic speckle, utilizes speckle effect equalization to reduce the speckle vision.But because the rotation of modulator element or vibration need high-frequency electric machines to drive usually; Therefore have usually system unstable, produce noise, optical loss high, need shortcomings such as the space is big; Thereby it is not desirable especially causing speckle to suppress effect; And along with the microminiaturized trend of projector, traditional speckle inhibition method more and more can not be satisfied the demand.
The utility model content
The utility model technology is dealt with problems: the deficiency that overcomes prior art; A kind of simple controllable, stable high and low loss are provided and need not mechanical motion, the constitutionally stable laser display system that suppresses based on the electrooptical deflection speckle, realize high-quality laser display.
The utility model technical solution: a kind of laser display system that suppresses based on the electrooptical deflection speckle comprises: laser instrument, the polarizer, electro-optic deflector, long-focus convergent lens, scatter plate, even optical module, linear space photomodulator and projecting lens assembly; Place the polarizer, electro-optic deflector, long-focus convergent lens, scatter plate, even optical module, linear space photomodulator and projecting lens assembly in proper order from the laser optical beam-emergence direction.Wherein:
Laser instrument is used to produce laser beam;
The polarizer, the laser beam that laser instrument is produced rises partially, to produce the line polarisation along the e light polarization direction, gets into electro-optic deflector;
Electro-optic deflector is made up of electrooptical material, and under the action of alternative electric field of control circuit, the line polarisation constantly changes through the refractive index of electrooptical material, makes outgoing beam produce the average effect of coming flyback retrace in integral time at human eye;
The long-focus convergent lens, the beam convergence that will pass through electro-optic deflector is to scatter plate;
Scatter plate is used for the scattering convergent beam, further reduces the light field coherence;
Even optical module, the light beam after scattering assembled is collected, shaping, collimation, evenly, to reduce the loss of light field energy;
The linear space photomodulator produces image to carrying out spatial modulation through the light beam behind the even optical module;
The projecting lens assembly, with the image projection that produces to screen.
Said electrooptical material is electro-optic crystal or electro-optic polymer material.
Said electro-optic crystal is lithium columbate crystal or barium titanate crystal.
Said linear space photomodulator is a kind of among LCD, DLP or the LCoS.
Said even optical module is made up of a microlens array, light siphunculus and convergent lens successively in proper order.
The principle of the utility model: produce laser beam by laser instrument; Laser beam is risen partially, so that light beam has predetermined polarization direction; Light beam irradiates makes the emergent light angle constantly change through electrooptical effect on electro-optic deflector; Again the emitting laser light beam is carried out scattering and shimming, further reduce the coherence of light field and produce the uniform light field of intensity; Utilize the linear space photomodulator to produce image, again through projection lens with image projection on screen.
The utility model advantage compared with prior art is: the utility model has avoided adopting the speckle cancellation element of complex structure and poor controllability; Need not to adopt mechanical motion; Thereby can eliminate the deficiency that speckle overcomes prior art, and simple controllable, stable high and low loss (loss can be low to moderate have only 10%, general diffusing structure is not reach this numerical value); Realized high-quality laser display, and be specially adapted in the microsystem.
Description of drawings
Fig. 1 is the synoptic diagram according to the laser light projection display system of the practical implementation instance of the utility model;
Fig. 2 a schematically provided laser projection show in the synoptic diagram of shimming collimating element and linear space photomodulator;
Fig. 2 b has schematically provided the synoptic diagram of LCoS as linear space photomodulator and shimming collimating element;
Fig. 3 is to use the instance graph of lithium columbate crystal as electro-optic deflector, and a mainly illustrates the cut direction of lithium columbate crystal and the direction of alternating electric field (X, Y, Z are the crystal main shafts), and b is the vertical view of this electro-optic deflector.
Embodiment
To combine accompanying drawing to describe the embodiment of the utility model in detail below.
As shown in Figure 1, according to the laser light projection display system of first embodiment of the utility model, comprising: laser instrument 11 is used to produce laser beam, as lighting source; The polarizer 12 is used for producing the line polarisation (at Fig. 1 light beam through the polarizer 12 rear polarizer be perpendicular to paper) of polarization along the crystal Z-direction; Electro-optic deflector 13 is used for deflected beam, makes the light beam emergence angle constantly change through electrooptical effect, and is in this example, a kind of with the example of lithium columbate crystal as electro-optic deflector with providing; Long-focus convergent lens 14 is used for beam convergence to scatter plate 15, and the effect of long-focus convergent lens 14 is to strengthen the amplitude that light beam comes flyback retrace; Scatter plate 15 is used for the scattering convergent beam, further reduces the light field coherence; Even optical module 16 is made up of a microlens array, light siphunculus and convergent lens jointly, is used to collect the light field of dispersing, and the even light of shaping; Linear space photomodulator 17 is used to produce image; Projecting lens assembly 18 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, the gas laser.
Because the electrooptical deflection modulator material of using in the utility model instance is a lithium columbate crystal, so insert a polarizer 12 in laser instrument 11 backs.Light beam gets into the polarizer 12, and the polarization direction will be modulated onto the Z-direction (the concrete direction of Z axle is with reference to shown in Figure 3) along lithium columbate crystal, because laser beam itself is exactly the line polarisation, so still retention wire is inclined to one side after passing through the polarizer 12.
Laser beam through the polarizer incides electro-optic deflector 13; Electro-optic deflector 13 in this instance is made up of a lithium niobate prism wedge and alternating electric field control circuit, and is concrete like Fig. 3 a, shown in the b; Alternating electric field is along the Z axle of the optical axis of crystal; Because incident light polarization also is the Z direction, under electrooptical effect, n
zWill change with alternating electric field, concrete form is:
N wherein
zBe the refractive index of polarization along the light field of Z direction, n
eBe the extraordinary ray refractive index of material, γ
33Be the electrooptical coefficient of material, n
eWith γ
33Relevant with material type, in case confirm employed electrooptical material, n
eWith γ
33Be exactly constant, E
zIt is added alternating electric field.The control circuit of alternating electric field is shown in Fig. 3 b, and electrode paste is in the both sides of electrooptical material, and added alternate electrical signal frequency is 200Hz, can produce the effect of multiple averaging at human eye in integral time like this.
The entering electrooptical material of the mode of incident light shown in Fig. 3 a, used electrooptical material is a lithium columbate crystal in this instance, incident light since the effect polarization direction of the polarizer 12 along the Z-direction of crystal.When light is propagated in crystal, because n
zCycle change, cause the emergence angle generating period to change, be similar to and produce a light source of constantly doing microvibration, if vibration frequency is enough high, will produce average effect in integral time at human eye.
In order to improve optical quality; The utility model embodiment uses a block length focal length convergent lens 14; Light beam can improve optical quality greatly through will being assembled after the long-focus convergent lens 14, and the effect of long-focus convergent lens 14 is to strengthen the amplitude of beam deflection scanning as far as possible.
Light beam continues into injecting scatter plate 15, and scatter plate 15 can be the laser beam scattering of assembling, and the correlativity of light field further is inhibited, and increases the size of light beam simultaneously greatly, plays the effect of expanding bundle.
Scattered light gets into even optical module 16, is made up of microlens array, light siphunculus and convergent lens, can collect the scattered light of dispersing, even simultaneously light, and the outgoing light field is a directional light, distribution of light intensity is distributed as comparatively ideal flat-head type distribution simultaneously.Like what those skilled in the art knew, the microlens array in the even optical module 16 can also be fly's-eye lens, array mirror, optical fiber or random order phase-plate etc.
Linear space photomodulator 17, projecting lens assembly 18 is used to produce image, and projects image onto on the display screen.Fig. 2 a has provided a kind of synoptic diagram of the laser light projection display system neutral line spatial modulator of present embodiment; Promptly comprise the polarizer 21 and spatial light modulator 22, wherein the effect of the polarizer 21 is the linearly polarized lights that produce specific direction, and spatial light modulator 22 can be LCD; DLP; A kind of among the LCOS, its effect is that distribution of light intensity is modulated, and produces needed image.Spatial light modulator 22 shown in Fig. 2 b is LCoS.It wherein is the effect that PBS semi-transparent semi-reflecting lens 23 plays the screening polarized light field.
Although described the utility model and advantage thereof in detail, should be appreciated that under the situation of spirit that does not deviate from the utility model that limits appended claim and scope, can carry out various variations, replacement and transformation.
Claims (5)
1. a laser display system that suppresses based on the electrooptical deflection speckle is characterized in that comprising: laser instrument, the polarizer, electro-optic deflector, long-focus convergent lens, scatter plate, even optical module, linear space photomodulator and projecting lens assembly; Place the polarizer, electro-optic deflector, long-focus convergent lens, scatter plate, even optical module, linear space photomodulator and projecting lens assembly in proper order from the laser optical beam-emergence direction.
2. the laser display system that suppresses based on the electrooptical deflection speckle according to claim 1, it is characterized in that: said electrooptical material is electro-optic crystal or electro-optic polymer material.
3. the laser display system that suppresses based on the electrooptical deflection speckle according to claim 2, it is characterized in that: said electro-optic crystal is lithium columbate crystal or barium titanate crystal.
4. the laser display system that suppresses based on the electrooptical deflection speckle according to claim 1 is characterized in that: said linear space photomodulator is a kind of among LCD, DLP or the LCoS.
5. the laser display system that suppresses based on the electrooptical deflection speckle according to claim 1, it is characterized in that: said even optical module is made up of a microlens array, light siphunculus and convergent lens successively in proper order.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220221888 CN202583679U (en) | 2012-05-15 | 2012-05-15 | Laser display system based on electro-optical deflection speckle suppression |
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| CN 201220221888 CN202583679U (en) | 2012-05-15 | 2012-05-15 | Laser display system based on electro-optical deflection speckle suppression |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104634285A (en) * | 2015-02-28 | 2015-05-20 | 河南科技大学 | Speckle generating device and method with adjustable contrast value |
| CN105445492A (en) * | 2015-12-14 | 2016-03-30 | 华中科技大学 | Scattering medium-penetrating laser speckle flow speed detection method and device thereof |
| CN105759444A (en) * | 2016-05-10 | 2016-07-13 | 中国科学技术大学 | Static speckle removal device based on lens array and laser projector |
| CN106707523A (en) * | 2017-01-19 | 2017-05-24 | 宁波纳美致生物科技有限公司 | Mechanical stress free multimode fiber beam speckle homogenization system |
| CN107861320A (en) * | 2016-09-22 | 2018-03-30 | 上海激亮光电科技有限公司 | A kind of tricolor laser optical fiber transmits projector |
| CN108681191A (en) * | 2018-05-18 | 2018-10-19 | 中国科学院理化技术研究所 | A kind of method of laser projection device and weakening laser speckle |
-
2012
- 2012-05-15 CN CN 201220221888 patent/CN202583679U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104634285A (en) * | 2015-02-28 | 2015-05-20 | 河南科技大学 | Speckle generating device and method with adjustable contrast value |
| CN104634285B (en) * | 2015-02-28 | 2017-04-05 | 河南科技大学 | A kind of regulatable speckle generator of contrast value and its production method |
| CN105445492A (en) * | 2015-12-14 | 2016-03-30 | 华中科技大学 | Scattering medium-penetrating laser speckle flow speed detection method and device thereof |
| CN105445492B (en) * | 2015-12-14 | 2019-11-26 | 华中科技大学 | A kind of laser speckle current velocity testing method and device through scattering medium |
| CN105759444A (en) * | 2016-05-10 | 2016-07-13 | 中国科学技术大学 | Static speckle removal device based on lens array and laser projector |
| CN107861320A (en) * | 2016-09-22 | 2018-03-30 | 上海激亮光电科技有限公司 | A kind of tricolor laser optical fiber transmits projector |
| CN106707523A (en) * | 2017-01-19 | 2017-05-24 | 宁波纳美致生物科技有限公司 | Mechanical stress free multimode fiber beam speckle homogenization system |
| CN108681191A (en) * | 2018-05-18 | 2018-10-19 | 中国科学院理化技术研究所 | A kind of method of laser projection device and weakening laser speckle |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20150515 |
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| EXPY | Termination of patent right or utility model |