CN101349811A - Laser light source projection machine provided with potential phase modulator - Google Patents

Laser light source projection machine provided with potential phase modulator Download PDF

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Publication number
CN101349811A
CN101349811A CNA2008101474724A CN200810147472A CN101349811A CN 101349811 A CN101349811 A CN 101349811A CN A2008101474724 A CNA2008101474724 A CN A2008101474724A CN 200810147472 A CN200810147472 A CN 200810147472A CN 101349811 A CN101349811 A CN 101349811A
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China
Prior art keywords
phase modulator
light source
laser light
light
projection
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CNA2008101474724A
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Chinese (zh)
Inventor
孙顺庆
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SHANGHAI INFO-TECH Co Ltd
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SHANGHAI INFO-TECH Co Ltd
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Priority to CNA2008101474724A priority Critical patent/CN101349811A/en
Publication of CN101349811A publication Critical patent/CN101349811A/en
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Abstract

A laser light source projector with a phase modulator relates to a projection device, in particular to an improvement on the micro projection devices adopting laser light sources, wherein a dynamic scatting piece is arranged at the back of three color selective mirrors, a scattering motor is provided above the dynamic scattering piece and is connected with the scattering piece, a phase modulator is provided between a light modulator and a projection lens. The phase modulator can reduce the coherence of the radiation lights of the laser light source to improve optional nature, the dynamic scattering piece improves the changeability of light incident angle, the diffusion angle and vibration frequency of the dynamic scattering piece can be changed to improve changeability. The invention can improve changeability via multiple ways to weaken and eliminate noise points, improve projection quality and satisfy market demands.

Description

A kind of laser light source projection that is provided with phase modulator
Technical field:
The present invention relates to a kind of projector equipment, be specifically related to a kind of improvement of using the micro projection equipment of LASER Light Source.
Background technology:
In order to develop the portable minisize projector also littler than palm, perhaps directly can embed projector in the notebook computer, need develop the projector of the little and low-power consumption of volume, and the very high LASER Light Source of optical efficiency is undoubtedly the first-selection of low-power consumption light source.But, though the laser optical efficiency is very high, and the micro projection light source that is best suited for again, but because of the original light coherence of laser, and make projection have hot-tempered point easily.
Because the coherence that laser is intrinsic bright or dark zone can occur on the imaging one side, the recurrent interference pattern in this zone just becomes hot-tempered point.This interference pattern has reduced imaging effect, becomes to use minitype projection machine projection imaging quality main reasons for decrease.
Thereby it is not naked eyes identification that industry all makes this hot-tempered point in a kind of technology of effort exploitation all the time, but achievement is very little.
The method that present industry is removed hot-tempered point has three kinds haply.
The first, the changeability of increase angle of incidence of light increases arbitrariness (Randomness);
The second, the changeability of increase laser position phase increases arbitrariness;
The 3rd, continue to change optical maser wavelength, there are different most laser to synthesize a little wavelength at same optical axis, increase arbitrariness;
Technology commonly used at present makes dynamic scattering sheet (Moving diffuser) periodic vertical vibration that comes and goes on optical axis, increases arbitrariness (Randomness), can reduce hot-tempered point, but can not remove fully, makes the people seem very uncomfortable.
Summary of the invention:
The purpose of this invention is to provide a kind of laser light source projection that is provided with phase modulator, it can significantly reduce the hot-tempered point of imaging in the screen, reaches the market demands of applications.In order to solve the existing problem of background technology, the present invention is by the following technical solutions: it comprises red light source 1, blue-light source 2, green light source 3, three dichronic mirrors 4, beam-shaping device 5, field lens 6, polarisation beam separator 7, photomodulator 8, projecting lens 9, it also comprises dynamic scattering sheet 10, scattering motor 11, phase modulator 12, dynamic scattering sheet 10 is arranged on the rear of three dichronic mirrors 4, and scattering motor 11 is arranged on the top of dynamic scattering sheet 10 and is connected in diffusion sheet 10; Phase modulator 12 is arranged between photomodulator 8 and the projecting lens 9.
Phase modulator 12 can reduce to increase its arbitrariness by coherence between the LASER Light Source radiating light among the present invention; Dynamic scattering sheet 10 increases the changeability of angle of incidence of light, by changing the spread angle and the vibration frequency of dynamic scattering sheet 10, increases its arbitrariness.The present invention increases its arbitrariness from many aspects, thereby reaches the purpose that weakens even eliminate hot-tempered point, improves the projection quality of projector, thereby reaches the market demands of applications.
Description of drawings:
Fig. 1 is a structural representation of the present invention, Fig. 2 is the structural representation of embodiment two, and Fig. 3 is the structural representation of embodiment three, and Fig. 4 is that a kind of displaying phasic difference of embodiment is λ/4 o'clock, in the composite wave of normal light and unusual light, the sketch map of electric wave resultant vector.
Embodiment:
Embodiment one, referring to Fig. 1,4, this embodiment is by the following technical solutions: it is made up of red light source 1, blue-light source 2, green light source 3, three dichronic mirrors 4, beam-shaping device 5, field lens 6, polarisation beam separator 7, photomodulator 8, projecting lens 9, dynamic scattering sheet 10, scattering motor 11, phase modulators 12, dynamic scattering sheet 10 is arranged on the rear of three dichronic mirrors 4, and scattering motor 11 is arranged on the top of dynamic scattering sheet 10 and is connected in diffusion sheet 10; Phase modulator 12 is arranged between photomodulator 8 and the projecting lens 9.Phase modulator 12 can reduce to increase its arbitrariness by coherence between the LASER Light Source radiating light among the present invention; Dynamic scattering sheet 10 increases the changeability of angle of incidence of light, by changing the spread angle and the vibration frequency of dynamic scattering sheet 10, increases its arbitrariness.
Described dynamic scattering sheet 10 is the optical device that are made of arbitrary graphic pattern on transparent smooth projection film, and light is reflected to pattern direction, changes incident angle; See through the pattern difference of light contact, refractive direction also can change thereupon, can occur the phenomenon of incident light scattering on the whole.The size of the pattern decision spread angle of diffusion sheet.The spread angle of dynamic scattering sheet 10 is proper between 0.5 °-2 °.The vibration frequency of dynamic scattering sheet 10 continues to change between 60Hz-360Hz, strengthens arbitrariness.It is above very difficult that the dynamic scattering sheet 10 that fractional motor and film constitute is driven into 360Hz, and also do not have what variation for high again frequency increase result.Drive to adopt the random function programming, with one second be the interval, driving frequency is random variation between 60Hz-360Hz just.
Described the present invention utilizes optics phase modulator 12 to increase the random changeability (Randomness) of laser.Light phase modulator 12 is a kind of rotary type birefringence devices.The light that the birefringence device will pass through is divided into normal light and unusual light, and the refractive index difference of two kinds of light, thereby advance along different light paths is so just become have nothing in common with each other the mutually synthetic light of light of position by light.So the phasic difference that produces is λ/2 o'clock, becomes line zero diopter polarization direction and changes 90 °, so can change mutually between p polarisation and the s.When phasic difference is the phase board of λ/4, form circle zero diopter rather than line zero diopter.
Simultaneously, if liquid crystal light modulator, that all is the line zero diopter by photomodulator without exception.This is because liquid crystal indicator comes display image by the line zero diopter.So, using the situation of liquid crystal light modulator, light is by λ/2 phase boards the time, and only the direction of wired zero diopter changes 90 °.But, when using λ/4 phase boards, become round zero diopter.
Fig. 4 shows that phasic difference is λ/4 o'clock, in the composite wave of normal light and unusual light, and the sketch map of electric wave resultant vector.Fig. 4 is the figure that makes according to following formula supposition normal light and unusual light.
n Normal light: n y=2.0, n x=0,
n Unusual light: n x=1.5, n y=0 (formula 1)
Just as shown in the figure, when phasic difference was λ/4 (90 °), the light by phase board was the circle zero diopter.Δ shown in the following formula 2 of phasic difference of normal light by above-mentioned phase board and unusual light.
Δ = 2 π λ 0 d ( | n 0 - n e | ) - - - (formula 2)
Shown in formula 2, decision by phase board normal light and during unusual light compositing, that decision bit differs is the refraction difference (n of phase board " thickness d ", normal light and unusual light 0-n e).
So, during the revolution phase board,, can change in the selection of normal light and unusual light though phasic difference does not change.That is, the difference with refractive index is depended in phasic difference, thereby is certain.n Normal light(x, y), n Unusual light(x, y) composition changes, and the size of resultant vector changes.
So just draw such conclusion, the phasic difference of phase board is constant.But, phase board revolution or when vibrate with a determining deviation, polarisation resultant vector size can continue to change, and increases the arbitrariness (Randomness) of ejaculation light.
The principle of work of this embodiment is as follows:
Three LASER Light Source red light sources 1, blue-light source 2, green light source 3 utilize 4 reflections of three dichronic mirrors respectively or directly see through, and inject dynamic scattering sheet 10.
The light that sees through dynamic scattering sheet 10 is through 5 distortion of beam-shaping device light beam.Why will be out of shape light beam, be in order to meet the plane of incidence of photomodulator 8, to improve optical efficiency.The typical case of beam-shaping device 5 is represented as fly's-eye lens, light pipe.
Fly's-eye lens is the shape that has a lot of micro lens bodies to constitute on beam-shaping device 5 transparent panels.For example, four jiaos of projection lens, hexagonal projection lens, circular or the like, but should adopt the shape consistent with photomodulator.For example,, also to be adjusted to quadrangle to micro lens, could reduce light loss to greatest extent if the active area shape of photomodulator 8 is quadrangles.
Photomodulator 8 is the light selective permeations with incident, stops or change the optical device of light path formation image.DMD (Digital Micromirror Device), LCD (LCD), LCOS etc. are its typical case's representatives.DMD is the driving method that adopts Field Sequential, utilization be shape such as rectangle, the as many Digital Mirror of quantity and pixel is the driving method of a kind of Field of employing Sequential.DLP regulates the light path of sending light from light source by DigitalMirror, reflexes to the projector of imaging in the screen.LCD (LCD) is come imaging by optionally opening or close liquid crystal.Utilize the projector of LCD (LCD) that direct viewing type, porjection type and reflection-type are arranged.Direct viewing type projector is the back mode that produces image when light passes through liquid crystal board of Direct observation LCD back.Porjection type projector utilizes the imaging of projecting lens by LCD the time to be incident upon in the screen after enlarging, the image that reflects from screen that we see.Reflection-type and porjection type structure are basic identical, only utilize to form reflectance coating on the plate of lower end, the light that reflects are enlarged be incident upon in the screen.LCOS (Liquid Crystal on Silicon) is a kind of of reflection LCD, changes that piece transparency glass plate below the existing LCD into silicon substrate, thereby becomes the reflection-type optical display.Being the polarisation beam separator 7 that utilizes reflection-type optical system then transfers to projecting lens 9 with the imaging in the photomodulator 8 after by phase modulator 12.Projecting lens 9 is made up of a plurality of lens, and the image expansion that photomodulator 8 is produced is incident upon in the screen.
Described photomodulator 8 is wherein a kind of of transmission-type LCD, reflection type LCD, LCOS, DMD.
The phase board of described phase modulator 12 is transportable.
Embodiment two, referring to Fig. 2, this embodiment is that with the difference of embodiment one phase modulator 12 is arranged on the rear end of projection lens 9.Other composition is identical with embodiment one with the contact relation.
Embodiment three, referring to Fig. 3, this embodiment is that with the difference of embodiment one photomodulator 8 uses the porjection type liquid crystal display, rather than reflection-type; Because use the photomodulator 8 of porjection type liquid crystal display, without the polarisation separation vessel, the light by field lens 6 directly is transferred to photomodulator 8, uses the photomodulator 8 of porjection type liquid crystal display that light engine is oversimplified, and dwindles its volume.Other composition is identical with embodiment one with the contact relation.

Claims (9)

1, a kind of laser light source projection that is provided with phase modulator, it comprises red light source (1), blue-light source (2), green light source (3), three dichronic mirrors (4), beam-shaping device (5), field lens (6), polarisation beam separator (7), photomodulator (8), projecting lens (9), it is characterized in that it also comprises dynamic scattering sheet (10), scattering motor (11), phase modulator (12), dynamic scattering sheet (10) is arranged on the rear of three dichronic mirrors (4), and scattering motor (11) is arranged on the top of dynamic scattering sheet (10) and is connected in diffusion sheet (10); Phase modulator (12) is arranged between photomodulator (8) and the projecting lens (9).
2, a kind of laser light source projection that is provided with phase modulator according to claim 1 is characterized in that described dynamic scattering sheet (10) is the optical device that is made of arbitrary graphic pattern on transparent smooth projection film; The spread angle of dynamic scattering sheet (10) is proper between 0.5 °-2 °, and the vibration frequency of dynamic scattering sheet (10) continues to change between 60Hz-360Hz, strengthens arbitrariness.
3, a kind of laser light source projection that is provided with phase modulator according to claim 1 is characterized in that light phase modulator (12) is a kind of rotary type birefringence device.
4, a kind of laser light source projection that is provided with phase modulator according to claim 1, it is characterized in that the light that the birefringence device will pass through is divided into normal light and unusual light, the refractive index difference of two kinds of light, thereby advance along different light paths, so just become have nothing in common with each other the mutually synthetic light of light of position by light, so the phasic difference that produces is λ/2.
5, a kind of laser light source projection that is provided with phase modulator according to claim 1 when it is characterized in that phasic difference is the phase board of λ/4, forms the circle zero diopter.
6, a kind of laser light source projection that is provided with phase modulator according to claim 1 is characterized in that described photomodulator (8) is wherein a kind of of transmission-type LCD, reflection type LCD, LCOS, DMD.
7, a kind of laser light source projection that is provided with phase modulator according to claim 1 is characterized in that the phase board of described phase modulator (12) is transportable.
8, a kind of laser light source projection that is provided with phase modulator according to claim 1 is characterized in that phase modulator (12) is arranged on the rear end of projection lens (9).
9, a kind of laser light source projection that is provided with phase modulator according to claim 1 is characterized in that photomodulator (8) uses the porjection type liquid crystal display, rather than reflection-type; Because use the photomodulator (8) of porjection type liquid crystal display, without the polarisation separation vessel, the light by field lens (6) directly is transferred to photomodulator (8).
CNA2008101474724A 2008-08-19 2008-08-19 Laser light source projection machine provided with potential phase modulator Pending CN101349811A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010099707A1 (en) * 2009-03-06 2010-09-10 上海三鑫科技发展有限公司 Laser optical engine
CN102012624A (en) * 2010-11-02 2011-04-13 上海理工大学 Micro projection device embedded into palm computer
CN102012623A (en) * 2010-11-02 2011-04-13 上海理工大学 Miniature projector system connected by wireless signal
CN102043321A (en) * 2010-11-02 2011-05-04 上海理工大学 Projection device serving as automotive auxiliary instrument
CN102608855A (en) * 2012-03-19 2012-07-25 中国科学院半导体研究所 Lamp optical system for projected display of 3-LCOS (Liquid Crystal On Silicon) laser
CN101788712B (en) * 2009-01-23 2013-08-21 上海三鑫科技发展有限公司 Optical engine for mini projector using laser light source
CN114442333A (en) * 2022-01-22 2022-05-06 山西汉威激光科技股份有限公司 Projection imaging device for eliminating DMD stray light

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101788712B (en) * 2009-01-23 2013-08-21 上海三鑫科技发展有限公司 Optical engine for mini projector using laser light source
WO2010099707A1 (en) * 2009-03-06 2010-09-10 上海三鑫科技发展有限公司 Laser optical engine
CN101825832B (en) * 2009-03-06 2012-08-22 上海三鑫科技发展有限公司 Laser optical engine
CN102012624A (en) * 2010-11-02 2011-04-13 上海理工大学 Micro projection device embedded into palm computer
CN102012623A (en) * 2010-11-02 2011-04-13 上海理工大学 Miniature projector system connected by wireless signal
CN102043321A (en) * 2010-11-02 2011-05-04 上海理工大学 Projection device serving as automotive auxiliary instrument
CN102608855A (en) * 2012-03-19 2012-07-25 中国科学院半导体研究所 Lamp optical system for projected display of 3-LCOS (Liquid Crystal On Silicon) laser
CN114442333A (en) * 2022-01-22 2022-05-06 山西汉威激光科技股份有限公司 Projection imaging device for eliminating DMD stray light

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Open date: 20090121