WO2010099707A1 - Moteur optique à laser - Google Patents

Moteur optique à laser Download PDF

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Publication number
WO2010099707A1
WO2010099707A1 PCT/CN2010/070156 CN2010070156W WO2010099707A1 WO 2010099707 A1 WO2010099707 A1 WO 2010099707A1 CN 2010070156 W CN2010070156 W CN 2010070156W WO 2010099707 A1 WO2010099707 A1 WO 2010099707A1
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Prior art keywords
laser
light
light source
optical engine
source
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PCT/CN2010/070156
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English (en)
Chinese (zh)
Inventor
权星泽
金东侠
金城守
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上海三鑫科技发展有限公司
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Priority to JP2011600069U priority Critical patent/JP3174810U/ja
Publication of WO2010099707A1 publication Critical patent/WO2010099707A1/fr

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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
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/145—Beam splitting or combining systems operating by reflection only having sequential partially reflecting surfaces
    • 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
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • G02B27/1026—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with reflective spatial light modulators
    • G02B27/1033—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with reflective spatial light modulators having a single light modulator for all colour channels
    • 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
    • G03B21/2033—LED or laser light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/37—Non-linear optics for second-harmonic generation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0092—Nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2383—Parallel arrangements
    • H01S3/2391—Parallel arrangements emitting at different wavelengths

Definitions

  • the present invention relates to portable pico projectors, and more particularly to light source technology for portable pico projectors.
  • the laser is representative of a light source with a small volume and high light output capability.
  • the laser chip has a size of about 2000 ⁇ m, but can output light of 1 W or more, and is an excellent light-emitting element.
  • the disadvantage of lasers is the presence of Speckle.
  • Speckle is an intrinsic property of lasers and is an interference phenomenon caused by the high coherence of lasers with the same wavelength, phase, and amplitude. Speckles appear as spots on the screen, which can damage the quality of the image and give the viewer a flickering feeling.
  • an embodiment of the present invention provides a laser optical engine, including:
  • At least one laser source At least one laser source
  • a light modulator that generates an image using light emitted by a light source
  • the projection lens magnifies and projects the image generated by the light modulator, and further includes:
  • a modulation drive unit for modulating the input load of the light source during the on time to a load that varies at a frequency above one kilohertz.
  • 300Mhz is applied to a laser light source that does not require frequency multiplication.
  • the high-speed modulation has a significant effect on speckle reduction caused by wavelength fluctuations. This is because the resonance phenomenon unique to the laser diode fluctuates the magnitude of the charge density existing in the active field of the laser diode, which causes a change in the tortuosity in the resonator to cause wavelength fluctuation.
  • the green laser generated by the frequency doubling is performed at 2 kHz.
  • the modulation of the frequency repeat switch not only reduces the speckle, but also increases the total light output of the green laser.
  • the speckle can be diffused, and the interference between the lines caused by the laser light source can be weakened.
  • the laser speckle can be further attenuated by the vibrating beam shaper.
  • FIG. 1 is a schematic view showing the structure of an optical engine to which the technical solution of the present invention is applied;
  • FIG. 2 is a schematic diagram of a driving signal for synchronously driving each light source and a light modulator
  • FIG. 3 is a schematic view showing a driving method of a laser light source in an embodiment of the present invention.
  • Figure 4 is a simplified diagram of the green laser generation process
  • Fig. 5 is a diagram showing changes in light output of DPM according to changes in input load in the embodiment of the present invention.
  • the structure of an optical engine to which the technical solution of the present invention can be applied is as shown in FIG. 1.
  • the optical engine is of a reflective type, including: an R light source (10R), a G light source (10G), a B light source (10B), and a dichroic mirror 50R. , 40G, 50B, diffuser (20), beam shaper (Beam Shaper) (30), objective lens (40-1, 40-2), light modulator (60), projection lens (70), polarization beam splitter (80), where R stands for red, G stands for green, and B stands for blue .
  • the R/G/B light source sequentially illuminates the R/G/B light. Specifically, the time for irradiating one frame is set to T, the time of T/3 is irradiated to the R light source, and the time of the next T/3 is irradiated with the G light source, and then The next T/3 time illuminates the B source. It can be understood that the light source can also be sequentially irradiated in other orders, such as B/G/R.
  • the light source used in the micro projector requires a small volume and a large amount of light, so a laser light source is required.
  • the three light sources (10R, 10G, 10B) are reflected by the respective dichroic mirrors 50R, 50G, 50B or transmitted to the diffuser (20).
  • the dichroic mirror 50G functions to reflect the G light source (green laser light emitted from 10G) and transmit the remaining light.
  • the dichroic mirror 50G can also use a general mirror that can reflect all of the ordinary visible light.
  • the dichroic mirror 50R functions to reflect the R light source (red laser light emitted from 10R) and pass the light of the remaining wavelength range
  • the dichroic mirror 50B functions to reflect the R light source (the blue laser light emitted from 10B) through the remaining wavelength. The effect of the range of light.
  • the diffuser (20) vibrates perpendicular to the optical axis, so the randomness of the light increases as it passes through the diffuser (20).
  • This diffuser is a device designed to eliminate laser-specific laser speckles (Speckle) to reduce the coherence of laser light to reduce laser speckle.
  • Light passing through the diffuser (20) will transform the beam shape through the beam shaper (30).
  • the reason for changing the shape of the beam is to shape the pattern of the beam to the shape of the incident surface of the light modulator (60) to improve the light efficiency.
  • the beam shaper (30) uses a fly-eye lens composed of a small lens body on both sides, and two single-sided lenses may be used. On such two sides, or a plurality of small lens bodies each formed by aggregating them on one another, they are formed in one-to-one correspondence with each other.
  • Such a light-speed shaper converts a laser incident at a diameter of 100 to 200 ⁇ m into a surface state and expands, which can alleviate the coherence characteristics of the laser and diffuse the light energy into a surface light, thereby reducing the specificity of the laser light generated by the concentration together. The danger.
  • the small lens body included in the fly-eye lens may have various shapes such as a quadrangular convex lens shape, a hexagonal convex lens shape or a circular shape, etc., but preferably conforms to the effective area shape of the light modulator.
  • the shape of the small lens body is also quadrangular to minimize light loss.
  • the diameter of the lenslet body is preferably 80-500 um, and the beam is more easily shaped at this size. This is because the diameter of the small lens is less than 80 um, and the lattice pattern is generated in the light beam due to the continuity of the laser, and it is difficult to make a lens configuration having a smooth surface smaller than 80 um in the prior art. When the diameter is increased, the effect of the beam shaper is weakened, and the uniform light source required for the ultra-small optical engine is not obtained, so it is preferable to use 500 um or less.
  • Each lenslet body is composed of a mixture of lens lenses of various sizes, thereby reducing laser speckle.
  • the objective lens (40) is a lens that bundles light shaped by a beam shaper by a light modulator (60), and generally consists of one to two sheets.
  • the light modulator (60) refers to an element that selectively passes incident light, blocks or changes the optical path to form an image.
  • a typical example of a light modulator (60) is a digital micromirror device (Digital Micromirror Device (“DMD”), Liquid Crystal Display (“LCD”) components, liquid crystal on silicon (Liquid) Crystal On Silicon, referred to as "LCOS” and so on.
  • DMD Digital Micromirror Device
  • LCD Liquid Crystal Display
  • LCOS liquid crystal on silicon
  • DMD is used in digital light processing (Digital Light Processing, referred to as "DLP"), which uses the field timing (field) Sequential), using a digital mirror arranged in the same number of pixels as the number of pixels (DIGITAL MIRROR).
  • DLP refers to a projector that uses light from a light source to adjust the optical path with a digital mirror and reflects it with a spacer to achieve Gradation or image formation.
  • a liquid crystal display element refers to an element that selectively turns on/off a liquid crystal to form an image.
  • the direct-view projection is a method in which the background light behind the liquid crystal display element forms an image through the LCD panel and can be directly observed;
  • the projection type projection is to enlarge an image formed by the liquid crystal display element by using a projection lens and project it onto the screen, and observe the slave screen.
  • the way of reflecting the image; the reflective type is basically the same as the projected type, except that the reflective type is provided with a reflective film on the substrate under the LCD, and the reflected light is amplified and projected onto the screen.
  • LCOS is a reflective liquid crystal display, which converts the lower substrate of the two-sided substrate of the conventional liquid crystal display end from a transparent glass to a silicon substrate, thereby operating in a reflective manner.
  • the polarization beam splitter (80) is an optical element that functions to transmit incident light to the light modulator (60).
  • the hexahedron of the glass material and the polarization separation film are distributed diagonally, which is necessary for the reflective optical engine.
  • the incident light hits the polarization separation film of the polarization beam splitter, the S polarization is reflected by the polarization separation film to the light modulator, and the P polarization is transmitted through the polarization beam splitter and discarded.
  • the light emitted by all the light source sections (10) is converted to a line parallel state at a certain point on the optical path to maintain the light efficiency.
  • the output of the laser light source has a polarization ratio of several hundred to one, and does not require an optical component in which the conversion line is parallel, so it is very suitable for a light source of a micro projector.
  • the S-polarized light reflected by the polarization separation film is converted into P-polarized light during formation of an image by the light modulator, and the image light converted into P-polarized light is again incident on the polarization beam splitter (80) and hits the polarization separation film.
  • the image light of this time is all P-polarized, so it is incident on the projection lens (70) through the polarization separation film.
  • the projection lens (70) is composed of a plurality of lenses, and an image formed by the light modulator (60) is enlarged and projected onto a screen (not shown).
  • Described above is a reflective optical engine, and the technical solution of the present invention is also applicable to a transmissive optical engine.
  • the structure of the transmissive optical engine is similar to that of the reflective type, the main difference being that there is no polarization beam splitter (80), and the optical paths of the objective lens (40), the light modulator (60) and the projection lens (70) are the same straight line.
  • FIG. 2 is a schematic view showing the principle of R/G/B three-color laser driving in the above-described pico projector.
  • a light modulator is used to represent the color image.
  • Use field timing field A sequential liquid crystal display device (LCD) is a light modulator that conforms to this purpose.
  • Such a field timing refers to a method in which the time zone is divided into three equal parts, and the green, red, and blue images corresponding to the three primary colors are sequentially displayed at respective times.
  • the human eye will have a residual image, and when the image is displayed at a certain speed or higher, it will be regarded as a continuous picture. Movies or animations use this principle.
  • the color image is the same.
  • the viewer When the R/G/B primary colors are quickly displayed, the viewer will consider the three primary colors mixed white due to the afterimage effect. Similarly, when the amount of light of the three primary colors is different, a plurality of colors can be adjusted, so that the relative amounts of the three primary colors can be adjusted to achieve the purpose of displaying the desired color.
  • the field timing drive is to re-divide the 60 Hz image frame by three equal parts.
  • An R/G/B sub-image corresponding to the amount of light of the three primary colors is generated for each video image, and then the above-described sub-image is driven at 180 Hz.
  • 180 Hz sub-image synchronously incident R/G/B light
  • a 60 Hz color image can be obtained.
  • FIG. 2 illustrates the above-described driving signals for driving the three R/G/B light sources according to the 180 Hz sub-image.
  • the R source signal is 180Hz, there is an On Time interval.
  • the interval between the light sources is used to transmit the light quantity data of each pixel to the light modulator, and there are three such intervals in each frame, and the sum is about 10% of the total load.
  • Control the On of each light source Time in conjunction with the time signal corresponding to the light modulator, repeats the 180 Hz on/off action with a certain amount of light energy.
  • Embodiments of the present invention improve upon such simple light source driving to reduce the coherence characteristics of the laser.
  • the laser is a collection of the same wavelength, the same amplitude, and the same phase of light, with strong coherence. Even if the beam shaper is used to shape and expand the surface light source, random interference image points will be generated. This interference image point is reflected as a speckle, called speckle.
  • speckle speckle
  • Randomness variable wavelength ⁇ variable phase ⁇ variable angle of incidence
  • the first method is that the incident angle is variable.
  • the diffuser (20) of Figure 1 is a method of variable angle of incidence. However, the light diffuser (20) cannot completely eliminate the speckle, and it is necessary to cooperate with other methods.
  • the second method is that the phase is variable.
  • the phase-variable method is to give a change in the polarization, and it is difficult to use it at the front end of the optical modulator.
  • the third method is that the wavelength is variable.
  • Variable wavelengths can be used as an important means other than diffusers (20).
  • Figure 3 is a schematic illustration of an improvement in light source driving in a case in which the present invention is applied.
  • the laser diode emits light of a single wavelength, but in both cases the wavelength can be varied.
  • the first is the change in temperature.
  • the wavelength of the light emitted by the laser diode changes gradually as the operating temperature changes. This range of change is about 0.25 nm / C °. At -10 C° ⁇ +10 The wavelength will continue to change arbitrarily if the C° range continuously changes.
  • the second is to turn on the light source as shown in Figure 3.
  • Time) is divided into a plurality of intervals and modulated into a high speed load.
  • the drawing is divided into nearly 10 sections for the convenience of explanation, but it is actually a high-speed modulation of 3Khz or more.
  • the high-speed modulation of 300 Mhz is performed, the speckle reduction effect caused by the fluctuation of the wavelength is remarkable.
  • the resonance phenomenon unique to the laser diode causes the fluctuation in the magnitude of the charge density existing in the active field of the laser diode to be large, which causes the variation in the tortuosity in the resonator to cause fluctuations in the wavelength.
  • the input load is adjusted to half the size in Figure 3.
  • the minimum value of the input load during high-speed modulation can be any value between the maximum value and zero.
  • Red and blue lasers can be modulated into loads that vary by hundreds of Mhz, but green light is not. Because the green light is called the diode pump module (Diode Pumped)
  • the optical component of the Module referred to as "DPM" for short.
  • the green laser is generated by the second harmonic (Second) Harmonic Generation ("SHG” for short) multi-wavelength infrared laser (Infrared Laser) multiplier (Frequency Doubling) is converted to a green wavelength to use.
  • SHG second harmonic
  • Infrared Laser Infrared Laser multiplier
  • Frequency Multiplication is generally performed using an optical component such as DPM (90), the construction of which is briefly described in FIG.
  • DPM Diode Pumped Module
  • Nd:YVO4 110, Nd-doped yttrium vanadate
  • KTP 120
  • KTP (120) is KTiOPO4 (Potassium Titanyl) Phosphate Crystals is a nonlinear optical component that is used in the frequency doubling of lasers.
  • the 808 nm infrared laser (100) is converted into a long-wavelength light of 1064 nm by Nd:YVO4 (110), and the long-wavelength laser of 1064 nm is multiplied by a non-linear element KTP (120) to a green laser of 532 nm.
  • the above DPM (90) cannot accommodate the high-speed modulation of hundreds of Mhz, so it should be changed to a few degrees of khz.
  • the light modulation of the green light described above can be up to 2000 KHz. Of course, it can also be modulated into other frequencies, such as 1500Hz, 2500Hz, etc., but the effect will be worse.
  • the above DPM (90) has an advantage in addition to the speckle reduction effect by driving modulation wavelength fluctuations as previously described.
  • Figure 5 is a schematic illustration of the operational characteristics of DPM (90) for an input load.
  • Figure 5a is an output diagram of an existing drive method for inputting a load.
  • Fig. 5b is an output diagram when the input load is modulated at a high speed.
  • the green light source is modulated to a number Khz repeatedly on/off, the light output during the entire load is increased. This is because the output capability of the DPM has a gradual attenuation characteristic when the load amount is increased. Therefore, the off interval between loads increases but the light output increases.
  • the input load of the infrared laser forming the green light source is modulated in an on/off manner, that is, the minimum value of the input load change is 0, and the embodiment of the present invention is not limited to this modulation mode, and the input load variation is minimal.
  • the value can actually be any value between 0 and the maximum.
  • the modulation of the light source can be accomplished by a modulation drive unit that modulates the input load of the light source during the on time to a load that varies at a frequency above one kilohertz.
  • the modulation driving unit is a logic unit, which can be implemented as a separate physical unit, or can be part of one physical unit, or can be implemented by a combination of multiple physical units.
  • the physical implementation of the modulation driving unit itself is not the most Importantly, the functions it implements are a key to solving the technical problems presented by the present invention.
  • the modulation drive of several KHz or more is performed, which can reduce the coherence characteristics of the laser and weaken the speckle phenomenon.
  • the light output efficiency can be increased.
  • elements for the vibrating beam shaper can be introduced, which are further attenuated by the vibrating beam shaper.
  • Level tube Light Emitting Diode, referred to as "LED"
  • LED Light Emitting Diode

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Abstract

L'invention porte sur un moteur optique à laser dans un dispositif de micro-projection portable. Afin de réduire l'interférence du laser et de diminuer la granularité laser, la fréquence de modulation est supérieure au KHz lorsque des sources de laser sont commandées en temps réel. Les sources de laser qui ne nécessitent pas de doublage de fréquence sont modulées par haute fréquence de 300 MHz, et la source de laser vert qui a été doublée en fréquence est modulée par 2 KHz, conduisant à une réduction de la granularité laser et une augmentation de l'émission du laser vert.
PCT/CN2010/070156 2009-03-06 2010-01-13 Moteur optique à laser WO2010099707A1 (fr)

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JP2011600069U JP3174810U (ja) 2009-03-06 2010-01-13 レーザ光学エンジン

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CN2009100569327A CN101825832B (zh) 2009-03-06 2009-03-06 激光光学引擎
CN200910056932.7 2009-03-06

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JP5867721B2 (ja) * 2012-04-02 2016-02-24 ソニー株式会社 照明装置および表示装置
JP6299460B2 (ja) * 2013-10-16 2018-03-28 セイコーエプソン株式会社 プロジェクター
CN106384935B (zh) * 2015-07-28 2019-08-20 海信集团有限公司 一种激光光源系统及显示装置
CN110178081B (zh) 2017-01-09 2021-08-31 歌尔股份有限公司 投影模块和电子设备
WO2018133025A1 (fr) 2017-01-20 2018-07-26 歌尔股份有限公司 Dispositif d'écouteur portable
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JP2012088451A (ja) * 2010-10-18 2012-05-10 Sony Corp 照明装置および表示装置
JP2015508611A (ja) * 2012-01-17 2015-03-19 イーストマン コダック カンパニー 可調光輻射器を使用する立体投射システム
JP2014178693A (ja) * 2014-04-08 2014-09-25 Sony Corp 照明装置および表示装置

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