CN101923186A - Projection system with laser speckle removal function - Google Patents
Projection system with laser speckle removal function Download PDFInfo
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- CN101923186A CN101923186A CN 201010278340 CN201010278340A CN101923186A CN 101923186 A CN101923186 A CN 101923186A CN 201010278340 CN201010278340 CN 201010278340 CN 201010278340 A CN201010278340 A CN 201010278340A CN 101923186 A CN101923186 A CN 101923186A
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Abstract
The invention provides a projection system with a laser speckle removal function. The system consists of a laser lighting system and two imaging systems, wherein, the laser lighting system composed of an RGB three-color laser and a uniform light tube provides a uniform lighting source for LCOS imaging; each imaging system composed of a beam-splitting prism, an LCOS chip, a drive circuit and an imaging lens forms an LCOS image on a random phase plate with high transmittance; when the random phase plate rotates in a high speed, the LCOS image thereon is formed on a screen through a projection lens, and outgoing beams of the random phase plate can be changed from linearly polarized light into elliptically polarized light due to different random phases thereof by adopting the random phase plate with a certain double refraction property; and by means of a time average principle and polarized light speckle characteristics, laser speckles can be greatly reduced to provide good image quality.
Description
Technical field
The present invention relates to a kind of optical projection system with laser speckle removal function.
Background technology
Laser monochromaticity is good, high directivity, the high characteristics of brightness, makes laser have true to nature, the clear picture of picture color as the light source of Projection Display, is applicable to the advantage of large screen display.But because its monochromaticity is good, coherent length is longer, makes each optical surface of optical projection system produce various interference effects, forms spuious interference fringe of lot of background and speckle noise, and the existence of speckle will make the quality of projected picture decrease.For improving the picture quality that laser projection shows, the design that suppresses laser speckle is very necessary.
In the middle of patents such as disclosed 200510089116.8,200510115472.2, as Fig. 3, shown in 4, all be by being divided into beamlet from the light beam that lasing light emitter sends and beamlet time or space average being reduced or eliminate the illuminator of speckle effectively, but this class illuminator can be because factors such as diffraction optical element processing all can cause certain fevering sodium effect, this is for if adopt LCOS or LCD as for the image modulation parts, to lose part energy, reduce the utilization factor of laser energy.In addition, lighting device at traditional eliminate laser speckle is disclosed in United States Patent (USP) in addition No. 6248381, principle also is that employing is similar, structurally he adopts fibre bundle to come eliminate laser speckle, but it is because the light beam coupling efficiency ratio of fibre bundle is lower, this will lose part energy, and has different phase place and remove the efficient of ecchymose removing and be lowered.
Summary of the invention
The present invention is directed to above problem, proposed a kind of optical projection system, the random order photograph of this system by rotating or moving with laser speckle removal function, laser speckle is eliminated by time averaging mode, imaging is clear, and energy loss is little, and it is effective to eliminate speckle.
Technical program of the present invention lies in: a kind of optical projection system with laser speckle removal function, comprise laser illumination system, imaging system and projection objective system,
Described laser illumination system is laid with RGB three look laser generators successively according to the exit direction of light path, makes the light combination mirror of the synthetic same light source beam of three look laser, convergent lens, even light pipe and illumination imaging lens group;
Described imaging system is laid with LCOS chip and driving circuit thereof successively according to the exit direction of light path, polarization splitting prism and imaging lens group;
Described projection objective system is a telecentric system, is made of projection objective group and screen;
It is characterized in that: be provided with between the imaging lens group of described imaging system and the projection objective system and drive the random order photograph move back and forth by the rotating mechanism driven in rotation or by travel mechanism.
This random order photograph adopts the effect meeting of the position photo dissipation spot with certain birefringence effect better.
The invention has the advantages that: the present invention utilizes the random order photograph that rotates or move, laser speckle is eliminated by time averaging mode, imaging is clear, energy loss is little, the elimination speckle is effective, but also can simplify the design of light path, in addition except utilizing the high random order photograph of transmittance, also can adopt the liquid crystal cell that has driving circuit or the wedged plate of rotation to carry out the elimination of laser speckle.
Description of drawings
Fig. 1 is the light channel structure synoptic diagram of embodiments of the invention 1.
Fig. 2 is the light channel structure synoptic diagram of embodiments of the invention 2.
Fig. 3 200510089116.8 has the schematic diagram of the illuminator and the optical projection system of laser speckle removal function.
Fig. 4 200510115472.2 has the schematic diagram of the illuminator and the optical projection system of laser speckle removal function.
Embodiment
A kind of optical projection system with laser speckle removal function comprises laser illumination system, imaging system and projection objective system,
Described laser illumination system is laid with RGB three look laser generators successively according to the exit direction of light path, makes the light combination mirror of the synthetic same light source beam of three look laser, convergent lens, even light pipe and illumination imaging lens group;
Described imaging system is laid with LCOS chip and driving circuit thereof successively according to the exit direction of light path, polarization splitting prism and imaging lens group;
Described projection objective system is a telecentric system, is made of projection objective group and screen;
It is characterized in that: be provided with between the imaging lens group of described imaging system and the projection objective system and drive the random order photograph move back and forth by the rotating mechanism driven in rotation or by travel mechanism.
This random order photograph adopts the effect meeting of the position photo dissipation spot with certain birefringence effect better.
The position photo that is provided with between the imaging lens group of described imaging system with laser speckle removal function and the projection objective system can be equivalent to the liquid crystal cell that is driven by random signal.
The position photo that is provided with between the imaging lens group of described optical projection system with laser speckle removal function and the projection objective system can be equivalent to the wedge-shaped element by the light-permeable of rotating mechanism driven in rotation.
Embodiment 1: with reference to figure 1,
This optical projection system comprises a laser illumination system, imaging system and projection objective system, laser illumination system is by RGB three look laser instruments 1,2,3, make the light combination mirror 4 of the synthetic same light source beam of three look laser, 5, convergent lens 6, even light pipe 7 and imaging lens group 8 are formed, imaging system is by LCOS chip 10 and driving circuit 9 thereof, polarization splitting prism 11 and imaging lens group 12 are formed, projection objective system is made up of projection objective group 13 and screen 14, is provided with between described imaging lens group 12 and the projection objective group 13 and drives the random order photograph 16 move back and forth by rotating mechanism 15 driven in rotation or by travel mechanism.
RGB laser instrument 1,2,3 collimation output different wavelength of laser, by light combination mirror 4,5 synthetic Ray Of Lights, convergent lens 6 mainly is its laser beam of closing bundle to be assembled improve coupling efficiency that enters light pipe and the even light effect that increases even light pipe, imaging lens group 8 is in order to reduce its spherical aberration, the general two-piece type lens combination that adopts, to spare the light pipe exit end and image on the LCOS chip, in order to shorten the distance of even light pipe to the LCOS chip, big pictures such as general one-tenth.
Polarization splitting prism 11, LCOS chip 10 and driving circuit 9 are realized image information is carried on the LCOS chip, imaging lens group 12 clearly becomes the picture on the LCOS chip on random order photograph 16 surfaces, and wherein the random order photograph can be replaced by the wedge-shaped element of good transmittance.
If the employing rotating mechanism, in order to reduce the random phase chip size, generally the picture that the picture on the LCOS chip is become to dwindle is at the random order photograph so; If adopt travel mechanism, so generally adopt the picture that waits big or amplification.
When the random order photograph rotated, rotational speed n was bigger, correlation time
tShorter.When the correlation time of detector integrates time T much larger than speckle intensity
tThe time, by the speckle theoretical analysis as can be known, contrast is approximately:
In the formula, D is a pupil diameter, z is the distance between observer and the screen, λ is an illumination wavelengths, by following formula as can be known, in illumination and one timing of observation situation, should increase the rotating speed of random order photograph for weakening the speckle contrast, make in the time shutter, to obtain more several speckle pattern, thereby reach the purpose that suppresses speckle.
Embodiment 2: with reference to figure 2,
This optical projection system comprises a laser illumination system, imaging system and projection objective system, laser illumination system is by RGB three look laser instruments 1,2,3, make the light combination mirror 4 of the synthetic same light source beam of three look laser, 5, convergent lens 6, even light pipe 7 and imaging lens group 8 are formed, imaging system is by LCOS chip 10 and driving circuit 9 thereof, polarization splitting prism 11 and imaging lens group 12 are formed, projection objective system is made up of projection objective group 13 and screen 14, is provided with between described imaging lens group 12 and the projection objective group 13 by driving circuit and drives 17 liquid crystal cells 18 that rotate or move.
RGB laser instrument 1,2,3 collimation output different wavelength of laser, synthetic by light combination mirror 4,5, convergent lens 6 mainly is its laser beam of closing bundle to be assembled improve coupling efficiency that enters light pipe and the even light effect that increases even light pipe, imaging lens group 8 is in order to reduce its spherical aberration, the general two-piece type lens combination that adopts, to spare the light pipe exit end and image on the LCOS chip, in order to shorten the distance of even light pipe to the LCOS chip, big pictures such as general one-tenth.
Polarization splitting prism 11, LCOS chip 10 and driving circuit 9 are realized image information is carried on the LCOS chip, imaging lens group 12 becomes on liquid crystal cell 18 surfaces enlargedly with the picture on the LCOS chip is clear, making all has several liquid crystal cell pixel cells on each image pixel unit, improve the effect of its laser speckle that disappears, driving circuit 17 is carried in random image on the liquid crystal cell, make the position of each pixel cell on the liquid crystal cell present random variation mutually, it eliminates the principle and the time averaging method realization of the similar employing of such scheme of speckle.
The present invention utilizes random order photograph or rotating liquid crystal cell to reach to make the outgoing beam of laser-projector become elliptically polarized light by linearly polarized light, utilize time average principle and polarized light speckle characteristic, greatly reduce the speckle of laser, the preferable image quality is provided.
Claims (3)
1. the optical projection system with laser speckle removal function comprises laser illumination system, imaging system and projection objective system,
Described laser illumination system is laid with RGB three look laser generators successively according to the exit direction of light path, makes the light combination mirror of the synthetic same light source beam of three look laser, convergent lens, even light pipe and illumination imaging lens group;
Described imaging system is laid with LCOS chip and driving circuit thereof successively according to the exit direction of light path, polarization splitting prism and imaging lens group;
Described projection objective system is a telecentric system, is made of projection objective group and screen;
It is characterized in that: be provided with between the imaging lens group of described imaging system and the projection objective system and drive the random order photograph move back and forth by the rotating mechanism driven in rotation or by travel mechanism.
2. the optical projection system with laser speckle removal function according to claim 1 is characterized in that: the position photo that is provided with between the imaging lens group of described imaging system and the projection objective system can be equivalent to the liquid crystal cell that is driven by random signal.
3. the optical projection system with laser speckle removal function according to claim 1, it is characterized in that: the position photo that is provided with between the imaging lens group of described imaging system and the projection objective system can be equivalent to the wedge-shaped element by the light-permeable of actuation mechanism driven in rotation.
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| CN 201010278340 CN101923186A (en) | 2010-09-10 | 2010-09-10 | Projection system with laser speckle removal function |
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| CN 201010278340 CN101923186A (en) | 2010-09-10 | 2010-09-10 | Projection system with laser speckle removal function |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102314064A (en) * | 2011-08-25 | 2012-01-11 | 北京亚视创业科技发展有限公司 | Composite light tunneling used for projector (projection apparatus) |
| WO2012122677A1 (en) * | 2011-03-17 | 2012-09-20 | Chen Chih-Hsiao | Speckle reducing device for laser projection system and speckle reducing method using the same |
| CN102722071A (en) * | 2011-03-30 | 2012-10-10 | 青岛海信电器股份有限公司 | Laser projection light source module and projector |
| WO2012174778A1 (en) * | 2011-06-24 | 2012-12-27 | 天津奇谱光电技术有限公司 | Expandable multi-laser composite system |
| 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 |
| CN105573038A (en) * | 2015-12-31 | 2016-05-11 | 海信集团有限公司 | Laser light source and laser projection equipment |
| WO2016150095A1 (en) * | 2015-03-20 | 2016-09-29 | 中兴通讯股份有限公司 | Method and device for inhibiting laser speckles |
| CN109254480A (en) * | 2018-11-09 | 2019-01-22 | 陈鑫 | A kind of hard copy, which helps, writes instrument |
| CN110030969A (en) * | 2017-12-21 | 2019-07-19 | 莱卡地球系统公开股份有限公司 | Measuring device with measuring beam homogenization |
| CN110873975A (en) * | 2018-09-04 | 2020-03-10 | 通用汽车环球科技运作有限责任公司 | Adjustable membrane device |
| CN115484443A (en) * | 2021-05-31 | 2022-12-16 | 立景光电股份有限公司 | Projection device |
| US11962945B2 (en) | 2021-05-31 | 2024-04-16 | Himax Display, Inc. | Projection apparatus |
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| WO2012122677A1 (en) * | 2011-03-17 | 2012-09-20 | Chen Chih-Hsiao | Speckle reducing device for laser projection system and speckle reducing method using the same |
| CN102722071A (en) * | 2011-03-30 | 2012-10-10 | 青岛海信电器股份有限公司 | Laser projection light source module and projector |
| WO2012174778A1 (en) * | 2011-06-24 | 2012-12-27 | 天津奇谱光电技术有限公司 | Expandable multi-laser composite system |
| CN102314064A (en) * | 2011-08-25 | 2012-01-11 | 北京亚视创业科技发展有限公司 | Composite light tunneling used for projector (projection apparatus) |
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| WO2016150095A1 (en) * | 2015-03-20 | 2016-09-29 | 中兴通讯股份有限公司 | Method and device for inhibiting laser speckles |
| 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 |
| CN105573038B (en) * | 2015-12-31 | 2017-05-24 | 海信集团有限公司 | Laser light source and laser projection equipment |
| CN105573038A (en) * | 2015-12-31 | 2016-05-11 | 海信集团有限公司 | Laser light source and laser projection equipment |
| CN110030969A (en) * | 2017-12-21 | 2019-07-19 | 莱卡地球系统公开股份有限公司 | Measuring device with measuring beam homogenization |
| CN110030969B (en) * | 2017-12-21 | 2022-05-24 | 莱卡地球系统公开股份有限公司 | Optical measuring device, method for coordinating target object using same, and storage medium |
| US11703591B2 (en) | 2017-12-21 | 2023-07-18 | Leica Geosystems Ag | Measuring device with measurement beam homogenization |
| CN110873975A (en) * | 2018-09-04 | 2020-03-10 | 通用汽车环球科技运作有限责任公司 | Adjustable membrane device |
| CN110873975B (en) * | 2018-09-04 | 2022-06-21 | 通用汽车环球科技运作有限责任公司 | Adjustable membrane device |
| CN109254480A (en) * | 2018-11-09 | 2019-01-22 | 陈鑫 | A kind of hard copy, which helps, writes instrument |
| CN115484443A (en) * | 2021-05-31 | 2022-12-16 | 立景光电股份有限公司 | Projection device |
| CN115484443B (en) * | 2021-05-31 | 2024-02-20 | 立景光电股份有限公司 | Projection device |
| US11962945B2 (en) | 2021-05-31 | 2024-04-16 | Himax Display, Inc. | Projection apparatus |
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Application publication date: 20101222 |