CN102736381A - Optical engine used for reflection-type mini-projector - Google Patents
Optical engine used for reflection-type mini-projector Download PDFInfo
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- CN102736381A CN102736381A CN2011100882520A CN201110088252A CN102736381A CN 102736381 A CN102736381 A CN 102736381A CN 2011100882520 A CN2011100882520 A CN 2011100882520A CN 201110088252 A CN201110088252 A CN 201110088252A CN 102736381 A CN102736381 A CN 102736381A
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- reflection
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- optical engine
- light source
- catoptron
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Abstract
The invention provides an optical engine which is used for reflection-type mini-projector. A reflector is provided between a light source and a light beam shaping device in the optical engine. The reflector vibrates in a central direction of an included angle between a reflection angle and an emergence angle, thereby speckle phenomenon of projection frame projected by the laser optical engine can be effectively weakened; the speckle phenomenon can be further weakened by using fly eyes lenses as the light beam shaping device; because the reflector uses a reflection film, a relatively good mechanical stability is obtained in vibration, wherein the reflective film is formed by sticking a metal layer on a membrane-like film.
Description
Technical field
The present invention relates to a kind of light engine, relate in particular to a kind of reflection-type optical engine for micro projector.
Background technology
In order will also to want little portable minisize projector or the projector that equipment such as notebook carry out embedded design to be carried out practicability with respect to the palm area; Must develop small size, low power consumption, the projector of high brightness uses light engine; Reach the above-mentioned requirements of micro projection engine; Must adopt proper light source, be applicable to that at present the light source of minitype projection machine has laser diode (Laser Diode is called for short " LD ") and light emitting diode (Light Emitting Diode; Be called for short " LED "), wherein laser is the light source higher than LED light efficiency.
The LED angle of divergence and light-emitting area are all bigger, thereby the light source utilization factor laser that compares is low; The light source utilization factor of laser is higher than LED, but also has the shortcoming that speckle phenomena is arranged in the projected picture simultaneously.Speckle is the inherent characteristic of laser, is a kind of interference that the height coherence (Coherence) of laser causes.Speckle is presented as spot shape noise on screen, can damage the image frame quality, gives a kind of dazzling sensation of beholder, causes dim eyesight and asthenopia easily.
Therefore, if can eliminate speckle phenomena effectively, laser is best suited for the light source of minitype projection machine.
Summary of the invention
The object of the present invention is to provide a kind of reflection-type optical engine for micro projector, can weaken the speckle phenomena of laser optical engine projected picture effectively.
The reflection-type optical engine for micro projector comprises:
At least one LASER Light Source;
Obtain the photomodulator that light beam generates image from each light source;
The light that each light source is sent converts the beam shaping of the illumination light that is fit to the photomodulator shape into;
Have catoptron between light source and the beam shaping, and this catoptron can vibrate along assigned direction.
The present invention vibrates along the angle center line direction of incident angle and emergence angle through a catoptron is set, and can reduce the speckle phenomena of laser optical engine effectively.
Fly's-eye lens can further be weakened speckle as beam shaping, and beam shaping is a plurality of lenslet bodies are arranged in the surface with matrix form a fly's-eye lens.
Catoptron uses the reflection film of on the film like film, pasting metal level, and mechanical stability preferably can be arranged when vibration.Catoptron is the reflectance coating of film forms.
Reflective light modulators can be liquid crystal on silicon or DMD.
Description of drawings
Fig. 1 is the synoptic diagram of the reflection-type optical engine of traditional use laser;
Fig. 2 is the synoptic diagram after the light path part of traditional reflection-type optical engine is amplified;
Fig. 3 is the catoptron light path part synoptic diagram of light engine provided by the invention.
Specific embodiments
For making the object of the invention, technical scheme and advantage clearer, embodiment of the present invention is done to describe in detail further below in conjunction with each accompanying drawing.
Fig. 1 is the structure of the reflection-type optical engine of conventional use.
Fig. 1 is the structural representation of traditional reflection-type optical engine, and the projector that uses LASER Light Source is by red-light source (10R), green-light source (10G), blue light source (10B); Close look mirror 50R, 50G, 50B; Diffuser (20), beam shaping (30), object lens (40); Photomodulator (60), projection lens (70), polarization spectroscope formations such as (80).
Light source is R/G/B rayed successively preferably.(10R, 10G are meant that 10B) when the time of shining a frame was made as T, the time of T/3 was shone R (red) light source, and the time of the T/3 that follows is shone G (green) light source, and the back to back T/3 time is shone B (indigo plant) light source to shine the R/G/B light source successively.
The light source that minitype projection machine is used, should the little luminous flux of also wanting of volume big, therefore need to use LASER Light Source, led light source or the light source of the mixed mode of laser and LED light.
The light that above-mentioned three light sources (10R, 10G, 10B) send is by closing look mirror 50R, 50G, 50B reflection or seeing through, and incides among the diffuser (20) after closing bundle.
The diffuser vertical vibration is in optical axis, and when therefore passing through the diffuser of vibration, the randomness of light-beam position can increase.This diffuser is the device that is provided with in order to eliminate the distinctive laser speckle of laser, reaches the purpose that reduces laser speckle in order to the coherence who destroys laser beam.
Light beam through diffuser is transformed into cross sectional shape and photomodulator (60) and matees and the uniform light beam of energy distribution through behind the beam shaping (Beam Shaper) (30).
Object lens (40) are that object lens (40) can be a slices, also can be multi-discs with the lens that are bundled to photomodulator (60) through the light beam after the beam shaping shaping.
Photomodulator (60) is meant the element that illuminating bundle is become coloured image according to modulate.The representative instance of photomodulator (60) has DMD (Digital Micromirror Device is called for short " DMD "), liquid crystal on silicon (Liquid Crystal On Silicon is called for short " LCOS ") or the like.DMD is kind of a type of drive of utilizing field sequential (field sequential), and picture signal is carried out numerical coding, drives the element that micro reflector array is modulated into picture.
LCOS be reflective liquid crystal show a kind of, be that the one side in the two sides before and after the display panels is planted reflection horizon and silicon substrate, through liquid crystal optionally the pixel in the ON/OFF liquid crystal array form the element of image.Adopt the optical projection system of LCOS panel, illuminating bundle directly penetrates liquid crystal panel and is modulated into picture, and the image that modulates projects on the screen after projection system amplifies again.
Instance among Fig. 1 is traditional reflection optical system, and polarization spectroscope (80) plays the effect that the incident light of the image that photomodulator is formed separates with reflected light.
Projection lens (70) is made up of a plurality of lens, and its effect is the image that is formed by photomodulator (60) to be amplified project on the screen.
Use the light engine of above-mentioned LASER Light Source, have light efficiency height, advantage that colour gamut is wide, but also exist the shortcoming of laser speckle simultaneously.
Laser is because of it has very strong coherence, be incident upon on the screen picture can because of screen to diffuse reflection of laser and scattering, form the spot of interfering in some zone, be called speckle.
Speckle shows as a kind of light and dark interference line, is a kind of interference, improves the coherence of the common method of speckle for destruction laser, or the position of quick randomly changing speckle, and dynamic speckle can not form stable light and dark dazzling bright spot.
The diffuser of Fig. 1 (20) promptly is to have adopted perpendicular to the vibration of the direction of optical axis or rotate the angle with dynamic change light beam, thereby dynamically changes the position that screen is gone up speckle.But the common transmittance of this diffuser is not high, generally about 80%, has certain directive property simultaneously, therefore direction of polarized light is exerted an influence.If use display panels as photomodulator, will reduce light path efficiency significantly.
A kind of randomly changing light-beam position is provided in the embodiment of the present invention for this reason and can reduced the technical scheme of optical efficiency.
Fig. 2 be with among Fig. 1 from closing the enlarged drawing of look mirror to the part the beam shaping.Described among Fig. 2 through the light beam that closes the look mirror close restraint same optical axis after, catoptron is with the light path subsequent optical path of turning back.In order to make the optical system among Fig. 1 compacter, in the embodiment of the present invention light path is turned back with catoptron.The present invention does not reduce the efficient of light path when improving speckle, has changed the structure of employed catoptron among Fig. 2.
Fig. 3 is the synoptic diagram that the mirror structure in the embodiment of the present invention is described in detail.Catoptron is positioned at the position with the optical axis intersection fork, on optical axis, vibrates to the incident angle that incides catoptron and the center line direction of the emergence angle that reflects.
For the mechanical stability of above-mentioned catoptron (90), its material had better not be used glass, and is to use the reflection film of on the film like film, pasting metal level.
In addition, in the embodiment of the present invention, beam shaping has been to use a plurality of lenslet bodies to be arranged in the fly's-eye lens on surface with matrix form.The micro objective body that is included in fly's-eye lens can be presented as multiple shape: such as four jiaos of convex lens shape, hexagonal convex lens shape or circle etc.
The present invention both had been applicable to it all is the situation of LASER Light Source, was applicable to that also the part light source is a LASER Light Source, and the part light source is the situation of the hybrid light source of led light source.
Though with reference to some preferred implementation of the present invention; The present invention is illustrated and describes, do not receive the restriction of above embodiment but those of ordinary skill in the art should be understood that the present invention; That describes in the foregoing description and the instructions just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.
Claims (5)
1. the reflection-type optical engine for micro projector is characterized in that, comprising:
At least one LASER Light Source;
Obtain the photomodulator that light beam generates image from said each light source;
The light that said each light source is sent converts the beam shaping of the illumination light that is fit to the photomodulator shape into;
Have catoptron between said light source and the beam shaping, and this catoptron can vibrate along assigned direction.
2. reflection-type optical engine for micro projector according to claim 1 is characterized in that, said assigned direction is the center line direction of the angle that forms by incident light with by the light of catoptron outgoing.
3. reflection-type optical engine for micro projector according to claim 1 is characterized in that, said beam shaping is the fly's-eye lens that a plurality of lenslet bodies is arranged in the surface with matrix form.
4. reflection-type optical engine for micro projector according to claim 1 is characterized in that, said catoptron is the reflectance coating of film forms.
5. reflection-type optical engine for micro projector according to claim 1 is characterized in that, said reflective light modulators can be liquid crystal on silicon or DMD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100882520A CN102736381A (en) | 2011-04-09 | 2011-04-09 | Optical engine used for reflection-type mini-projector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100882520A CN102736381A (en) | 2011-04-09 | 2011-04-09 | Optical engine used for reflection-type mini-projector |
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| CN102736381A true CN102736381A (en) | 2012-10-17 |
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| CN2011100882520A Pending CN102736381A (en) | 2011-04-09 | 2011-04-09 | Optical engine used for reflection-type mini-projector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110045481A (en) * | 2018-01-17 | 2019-07-23 | 长沙青波光电科技有限公司 | A kind of reflector apparatus and laser speckle light field generating means |
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| US5621529A (en) * | 1995-04-05 | 1997-04-15 | Intelligent Automation Systems, Inc. | Apparatus and method for projecting laser pattern with reduced speckle noise |
| JP2003262920A (en) * | 2002-03-07 | 2003-09-19 | Seiko Epson Corp | Back projection display device |
| CN1665285A (en) * | 2004-03-03 | 2005-09-07 | Lg电子有限公司 | Device for reducing deteriroation of image quality in display using laser |
| CN101064808A (en) * | 2006-04-27 | 2007-10-31 | 精工爱普生株式会社 | Projector, screen, projector system, and scintillation removing apparatus |
| CN101772722A (en) * | 2007-08-09 | 2010-07-07 | 柯尼卡美能达精密光学株式会社 | Laser projector and image projection method |
| CN101825830A (en) * | 2009-03-06 | 2010-09-08 | 上海三鑫科技发展有限公司 | Reflection-type optical engine |
| CN201965399U (en) * | 2011-04-09 | 2011-09-07 | 上海三鑫科技发展有限公司 | Optical engine for reflective miniature projector |
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2011
- 2011-04-09 CN CN2011100882520A patent/CN102736381A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5621529A (en) * | 1995-04-05 | 1997-04-15 | Intelligent Automation Systems, Inc. | Apparatus and method for projecting laser pattern with reduced speckle noise |
| JP2003262920A (en) * | 2002-03-07 | 2003-09-19 | Seiko Epson Corp | Back projection display device |
| CN1665285A (en) * | 2004-03-03 | 2005-09-07 | Lg电子有限公司 | Device for reducing deteriroation of image quality in display using laser |
| CN101064808A (en) * | 2006-04-27 | 2007-10-31 | 精工爱普生株式会社 | Projector, screen, projector system, and scintillation removing apparatus |
| CN101772722A (en) * | 2007-08-09 | 2010-07-07 | 柯尼卡美能达精密光学株式会社 | Laser projector and image projection method |
| CN101825830A (en) * | 2009-03-06 | 2010-09-08 | 上海三鑫科技发展有限公司 | Reflection-type optical engine |
| CN201965399U (en) * | 2011-04-09 | 2011-09-07 | 上海三鑫科技发展有限公司 | Optical engine for reflective miniature projector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110045481A (en) * | 2018-01-17 | 2019-07-23 | 长沙青波光电科技有限公司 | A kind of reflector apparatus and laser speckle light field generating means |
| CN110045481B (en) * | 2018-01-17 | 2021-05-18 | 长沙青波光电科技有限公司 | Reflector device and laser speckle light field generating device |
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Application publication date: 20121017 |