WO2012122677A1 - Dispositif de réduction du chatoiement pour système de projection à laser et procédé de réduction du chatoiement l'utilisant - Google Patents

Dispositif de réduction du chatoiement pour système de projection à laser et procédé de réduction du chatoiement l'utilisant Download PDF

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Publication number
WO2012122677A1
WO2012122677A1 PCT/CN2011/000424 CN2011000424W WO2012122677A1 WO 2012122677 A1 WO2012122677 A1 WO 2012122677A1 CN 2011000424 W CN2011000424 W CN 2011000424W WO 2012122677 A1 WO2012122677 A1 WO 2012122677A1
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WIPO (PCT)
Prior art keywords
laser
phase interference
phase
screen
spot
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PCT/CN2011/000424
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English (en)
Chinese (zh)
Inventor
陈致晓
Original Assignee
Chen Chih-Hsiao
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Application filed by Chen Chih-Hsiao filed Critical Chen Chih-Hsiao
Priority to PCT/CN2011/000424 priority Critical patent/WO2012122677A1/fr
Publication of WO2012122677A1 publication Critical patent/WO2012122677A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources

Definitions

  • the invention relates to a spot suppression device and a suppression method thereof for use in a laser projection system, in particular to provide at least one laser phase interference component on a laser beam projection path between a laser light source and a screen, so as to be reflected Or the laser beam passing through the phase interference element produces an uneven spatial phase change, and reduces the coherence length of the beam cross section of the imaging light of the image image finally emitted from the screen, thereby achieving the effect of suppressing the laser spot.
  • Background technique
  • a laser projection system 1 generally includes a laser projector 10 and at least one screen 20, but the laser projector 10 mainly includes: at least one laser light source 11 such as a separate R (red), G (green), B (blue) three-color laser light source but not limited to the laser beam 1 10 such as R (red), G (green), B (blue), etc. 10; - the light combining module 12 is not limited to form the aforementioned three-color laser light 1 10 into a laser beam 1 1 1 ; and at least one image generating element 13 for forming the laser beam into the imaging beam 1 12 and by the laser At least one light exit 101 on the casing of the projector 10 is projected outward onto the screen 20 to form an image frame.
  • at least one laser light source 11 such as a separate R (red), G (green), B (blue) three-color laser light source but not limited to the laser beam 1 10 such as R (red), G (green), B (blue), etc. 10
  • the light combining module 12 is not limited to form the aforementioned
  • the image generating component 13 can be divided into two types according to different imaging modes.
  • One is to use a beam deflecting device as shown in FIG. 1 , a port: a mirror, a 4-drum electromechanical mirror (Micro-Electronic Mechanical System vibratiom) Mirror (abbreviated as MEMS mirror), one of a polygon mirror, an ultrasonic grating, or a combination thereof, but not limited thereto, and the type of laser projector 10 generally includes: a laser light source
  • the module, a laser signal modulation module, a combined light module, a rotating plane mirror module, a rotating plane mirror control module and a signal conversion module are not limited; the other is to use a two-dimensional brightness adjustment array such as As shown in FIG.
  • FIG. 1 and FIG. 2 are only used to represent two different architectures of the laser projector 10 and the screen 20 in a laser projection system 1.
  • the detailed structure of the laser projector 10 and the related art of the imaging method, such as the imaging mode of the image generating element 13 and its technique, etc., will not be described in detail herein.
  • the laser beam has an intrinsic good coherent, which is a high-energy beam with uniform wavelength, uniform phase, single frequency and good guiding. When it is applied as the light source of the laser projector, it will Along with the laser speckle phenomenon.
  • the laser spot is an irregular granular brightness distribution caused by a homogenous light source on a rough surface, such as a projection screen 20 or a half transparent diffuser, which causes irregularities due to scattered light at different points due to rough surfaces. Constructive or destructive interference. Those with brighter light intensity are caused by constructive interference; those with darker light intensity are the result of destructive interference; laser spot will cause high spatial frequency noise of the projected image, with the resolution of the human eye. In addition to the visual persistence effect, these scattered light spots between different particles on the projection screen are the biggest disadvantages for laser projection image viewing.
  • the foregoing apparatus or method utilizes a braking mechanism to drive the screen 20 or a time-varying Diffuser to move or rotate relative to the laser light, so that the overall mechanism is complicated, the production cost of the product is relatively increased, and the volume is relatively large. Large, it is not conducive to the design requirements of the laser projector 10 thin and short.
  • the main object of the present invention is to provide a spot suppression device for a laser projection system and a method for suppressing the same, the laser projection system comprising a laser projector and a screen, wherein the laser projector comprises at least one laser light source for emitting a laser beam and at least one An image generating component, such as a beam deflecting device or a two-dimensional brightness adjusting array, for forming the laser beam into an imaging beam and projecting onto the screen by at least one light emitting port to form an image frame, which is emitted from the screen and is viewed by the human eye.
  • the laser projector comprises at least one laser light source for emitting a laser beam and at least one An image generating component, such as a beam deflecting device or a two-dimensional brightness adjusting array, for forming the laser beam into an imaging beam and projecting onto the screen by at least one light emitting port to form an image frame, which is emitted from the screen and is viewed by the human eye.
  • the spot suppression device of the present invention and the suppression method thereof utilize at least one laser light phase interference element which is a film-like junction having an appropriate thickness a structure having at least one phase interference pattern such as a one-dimensional random pattern, a one-dimensional periodic pattern, a two-dimensional random pattern, and a two-dimensional periodic pattern on the surface thereof Or a combination thereof; and the at least one phase interference component is disposed on a laser beam or an imaging beam projection path between the laser light source and the screen, so that the laser beam or the imaging beam passes through the reflection or the penetration
  • the phase interference element of the phase interferes with the pattern, an uneven spatial phase change can be generated, and the correlation length of the beam cross section of the image image of the image image finally emitted from the screen is reduced, thereby suppressing the image on the image frame.
  • the generated laser spot wherein the coherence length of the beam cross section is a parameter for indicating a phase change on a beam cross section, and the smaller the coherence length of the beam cross section, the phase distribution of the beam cross section is within a unit cross-sectional area
  • the coherence length of the beam cross section is a parameter for indicating a phase change on a beam cross section
  • the smaller the coherence length of the beam cross section, the phase distribution of the beam cross section is within a unit cross-sectional area
  • Another object of the present invention is to provide a spot suppression device for a laser projection system and a method for suppressing the same, wherein when the phase interference element is a reflective element, the laser beam or the imaging beam passes through the phase interference of the phase interference element in a reflective manner. a pattern; wherein when the phase interference component is a transmissive component, the laser beam or the imaging beam passes through the phase interference pattern of the phase interference component in a penetrating manner, and may generate a phase difference variation of at least ⁇ to enable the laser
  • the beam or imaging beam produces constructive or destructive interference variations that suppress the laser spot generated on the image.
  • Another object of the present invention is to provide a spot suppression device for a laser projection system and a method for suppressing the same, wherein the image generation element is a beam deflection device such as a mirror, a microelectromechanical mirror, a polygonal mirror, or an ultrasonic grating. Or one or a combination thereof, but not limited to, the at least one phase interference component is disposed at a position on a laser beam projection path between the laser light source and the beam deflecting device, a mirror surface of the beam deflecting device, and The imaging beam is projected onto the path between the beam deflecting device and the screen, at least in one of the positions.
  • the image generation element is a beam deflection device such as a mirror, a microelectromechanical mirror, a polygonal mirror, or an ultrasonic grating.
  • the at least one phase interference component is disposed at a position on a laser beam projection path between the laser light source and the beam deflecting device, a mirror surface of the beam deflect
  • Another object of the present invention is to provide a spot suppression device for a laser projection system and a method for suppressing the same, wherein when the image generation element is a two-dimensional brightness adjustment array, such as DLP (Digital Light Processor), LCOS ( Liquid Crystal On Silicon, one of the developing device and the Hologram developing device, wherein the at least one phase interference component is disposed at the following position: between the laser light source and the image generating component a projection path of the laser beam on the surface of the image generating element and an imaging beam projection path between the image generating element and the screen, at least one of the positions.
  • DLP Digital Light Processor
  • LCOS Liquid Crystal On Silicon
  • Another object of the present invention is to provide a spot suppression device for a laser projection system and a method for suppressing the same,
  • the at least one phase interference component is further disposed at the light exit of the laser projector such that the imaging beam is projected through the phase interference pattern of the phase interference component in a penetrating manner onto the screen to form an image frame.
  • Another object of the present invention is to provide a spot suppression device for a laser projection system and a method for suppressing the same, wherein the at least one phase interference component is further disposed on a surface of the screen to allow the image frame to pass through the phase interference in a penetrating manner. The phase interference pattern of the component is then received by the human eye.
  • Another object of the present invention is to provide a spot suppression device for a laser projection system and a method for suppressing the same, wherein the laser beam or the imaging beam is further operable when the laser beam or the imaging beam passes the phase interference pattern before being projected onto the screen.
  • the change in time passes through different regions of the phase interference pattern to cause the contrast of the laser spot to be reduced or suppressed by time averaging during the visual pause time observed by the human eye.
  • Another object of the present invention is to provide a spot suppression device for a laser projection system and a method for suppressing the same, wherein the laser beam or the imaging beam is further operable when the laser beam or the imaging beam passes the phase interference pattern before being projected onto the screen.
  • the phase interference pattern is passed over time (at different times) and at different angles of incidence to reconcile the contrast of the laser spot over time during the visual pause time observed by the human eye.
  • Another object of the present invention is to provide a spot suppression device for a laser projection system and a method for suppressing the same, wherein the laser spot suppression method comprises the following steps:
  • At least one laser light phase interference component wherein at least one laser light phase interference pattern is disposed thereon, wherein the laser light phase interference pattern is configured to enable the laser beam or the imaging beam to pass through the phase interference pattern in a reflective manner or in a penetrating manner Produce uneven phase changes;
  • a non-uniform phase change is generated for the laser beam or the imaging beam passing through the laser light phase interference pattern, and the coherence length of the beam cross section of the image image that is finally emitted by the screen is reduced.
  • the present invention provides a spot suppression device for a laser projection system, the laser projection system comprising a laser projector and a screen, wherein the laser projector comprises at least one laser light source for emitting a laser beam and at least one image generation The component is configured to form a laser beam into an imaging beam and project onto the screen by at least one light exit port to form an image frame, the image frame is emitted from the screen and received by the human eye;
  • the spot suppression device comprises:
  • At least one laser light phase interference component is disposed on a projection path of the laser beam or the imaging beam between the laser light source and the screen for the laser beam or the imaging beam to pass through, wherein the optical phase interference component is of a suitable thickness a film-like structure having at least one phase interference pattern on its surface;
  • the coherence length is a parameter for defining a frequency of change of a distribution state, and is used to indicate a phase change frequency of the laser beam or the imaging beam.
  • the phase distribution of the laser beam is The more and dense phase changes produced in the unit cross-sectional area, the better the suppression effect of the laser spot.
  • the manner in which the laser beam or imaging beam passes through the phase interference pattern comprises passing the phase interference pattern in a reflective manner or in a penetrating manner.
  • the phase interference pattern has a surface coherence length Pr that is less than a surface coherence length of any surface of the laser projection system that the laser beam or imaging beam passes over its projection path, wherein the surface coherence length Pr
  • the height variation frequency case used to represent a surface roughness is defined as the coefficient of the Gaussian distribution function of the self-correlation function D(R) of the two-dimensional pattern surface height variation in space:
  • D(R) exp(- ⁇ ) where R represents the distance in space; wherein the smaller the coherence length of the surface, the more the surface roughness distribution is denser in the unit length, the better the suppression of the laser spot is. . .
  • the phase interference pattern has a surface coherence length (Pr) that is less than the laser beam diameter, wherein the laser beam diameter is defined as a circle defined by the diameter that contains 99% of the energy of the laser beam.
  • the phase interference pattern comprises one of a one-dimensional scattered pattern, a one-dimensional periodic pattern, a two-dimensional scattered pattern, a two-dimensional periodic pattern, or a combination thereof.
  • the laser beam or the imaging beam can produce a phase difference variation of at least ⁇ after passing through the at least one phase interference pattern of the at least one laser light phase interference element in a reflective manner.
  • a phase difference variation of at least ⁇ can be generated to enable the laser beam or the imaging beam Produce constructive or destructive interference changes.
  • the phase interference component is a reflective component such that the laser beam or imaging beam passes through the phase interference pattern of the phase interference component in a reflective manner.
  • the phase interference element is a transmissive element such that the laser beam or imaging beam passes through the phase interference pattern of the phase interference element in a penetrating manner.
  • the image generating component is a beam deflecting device comprising the following groups: one of a mirror, a micro mirror, a polygon mirror, an ultrasonic grating, or a combination thereof.
  • the at least one phase interference component is disposed at a position on a laser beam projection path between the laser light source and the beam deflecting device, a mirror surface of the beam deflecting device, and the beam deflecting device and the screen
  • the imaging beam is projected onto the path, at least one of which is located.
  • the laser beam or the imaging beam when the laser beam or the imaging beam passes through the phase interference pattern before being projected onto the screen, the laser beam or the imaging beam further changes in time through different regions on the phase interference pattern to be observed by the human eye.
  • the contrast of the laser spot is reduced or suppressed by time averaging during the visual retention time.
  • the laser beam or the imaging beam when the laser beam or the imaging beam passes through the phase interference pattern before being projected onto the screen, the laser beam or the imaging beam further changes with time and passes the phase interference pattern at different incident angles to observe in the human eye.
  • the contrast of the laser spot is suppressed by the time average during the visual retention time.
  • the image generating component is a two-dimensional brightness adjustment array, one of the following groups: DLP, LCOS, and holographic imaging device.
  • the at least one phase interference component is disposed at: a laser beam projection path between the laser light source and the image generating component, an image on a surface of the image generating component, and an image between the image generating component and the screen At least one of the positions on the beam projection path.
  • the at least one phase interference component is disposed at a light exit of the laser projector such that the imaging beam is projected through the phase interference pattern of the phase interference component in a penetrating manner onto the screen to form an image frame.
  • the at least one phase interference component is disposed on a surface of the screen to enable the image to The phase interference pattern of the phase interference component passes through the human eye.
  • the present invention also provides a method for suppressing a spot of a laser projection system, which utilizes the spot suppression device of the laser projection system of any one of claims 1 to 17, the laser projection system comprising a laser projector and a screen, wherein the The laser projector comprises at least one laser light source for emitting a laser beam and at least one image generating component forms an imaging beam of the laser beam and is emitted from the light exit port onto the screen to form an image frame, which is emitted from the screen and is viewed by the human eye.
  • Receiving; the laser spot suppression method comprises the following steps:
  • the laser light phase interference pattern is configured to generate a non-uniform phase change when the laser beam or the imaging beam passes through the phase interference pattern in a reflective manner or in a penetrating manner; and the at least one laser light phase interference
  • the component is disposed on a projection path between the laser light source and the screen, so that the laser beam or the imaging beam can be reflected or penetrated by the laser light phase interference of the at least one phase interference component before being projected onto the screen.
  • the coherence length is a parameter for defining a varying frequency condition of a distribution state; wherein the coherence length of the beam section of the imaging light of the image frame is a parameter indicating a phase change condition on a beam section.
  • the coherence length of the beam section is small, it indicates that the phase distribution of the beam section produces more dense phase changes in the unit cross-sectional area; when the coherence length of the imaging beam section is smaller, the laser spot suppression effect is better.
  • FIG. 1 is a schematic view of an embodiment of a conventional laser projection system (provided with a beam deflecting device);
  • FIG. 2 is a schematic view of another embodiment of a conventional laser projection system (without a beam deflecting device); BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic view showing an embodiment (first embodiment) of the laser projection system shown in FIG. 1;
  • FIG. 4 is a schematic diagram (enlarged view) of an embodiment of a phase interference pattern of a phase interference element of the present invention (an enlarged pattern);
  • FIG. 5 is a phase interference pattern of a phase interference element of the present invention (one-dimensional periodicity) Schematic diagram of another embodiment (enlarged image);
  • 6 is a schematic diagram of an embodiment of a phase interference component of the present invention in cooperation with a MEMS mirror;
  • Figure 7 is a schematic view showing an embodiment (second embodiment) of the laser projection system of Figure 2 applied to the present invention.
  • Figure 8 is a schematic view showing the contrast and coherence length of the pre-suppression spot before the laser projection system has not utilized the present invention
  • Figure 9 is a schematic illustration of spot contrast and coherence length after the laser projection system has utilized the present invention.
  • DESCRIPTION OF REFERENCE NUMERALS 1-laser projection system; 10-laser projector; 11-laser source; 110, 111-laser beam; 112-imaging beam; 12-combination module; 13-image generating element; Protective cover; 14-light outlet; 20-screen; 30, 30a-phase interference component; 31, 31a, 3 lb-phase interference pattern. detailed description
  • the present invention provides a spot suppression device and a suppression method thereof for a laser projection system, and the spot suppression device and the suppression method thereof can be applied regardless of the imaging mode or the technical architecture of the laser projection system. Therefore, the present invention directly refers to the laser projection system 1 of two different technical architectures as shown in FIG. 1 and FIG. 2 to illustrate the technical features of the present invention, but FIG. 1 and FIG. 2 are only used to represent the laser in a laser projection system 1.
  • the two different architectures of projector 10 and screen 20 are not intended to limit the invention.
  • the laser projection system 1 includes a laser projector 10 and a screen 20, wherein the laser projector 10 mainly includes at least one laser light source 11 for emitting a laser beam 110 and at least one image generating component 13, wherein A light combining module 12 may be disposed between the laser light source 11 and the image generating element 13 but is not limited to form the laser light 110 into a laser beam 111.
  • the image generating element 13 is a beam deflecting device such as a mirror, a one-dimensional or two-dimensional MEMS mirror, and a polygon mirror ultrasonic grating.
  • a beam deflecting device such as a mirror, a one-dimensional or two-dimensional MEMS mirror, and a polygon mirror ultrasonic grating.
  • the spot suppression device 3 of the present embodiment uses at least one laser light phase interference element 30 to be disposed on the projection path of the laser beam 110, 111 or the imaging beam 112 between the laser light source 11 and the screen 20. For the laser beam 110, 111 or imaging beam 112 to pass.
  • the phase interference component 30 is a film-like structure having a suitable thickness, and the surface thereof is provided with at least one phase interference pattern 31, and the at least one phase interference pattern may be a one-dimensional random pattern as shown in FIG.
  • the periodic pattern is as shown in FIG. 5, one of a two-dimensional random pattern, a two-dimensional periodic pattern, or a combination thereof, such as two phase interference elements 30 can be utilized
  • the unidirectional phase interference pattern 31 is such that the combined application of the two phase interference elements 30 can still achieve the function of a two-dimensional random pattern or a two-dimensional periodic pattern.
  • the phase interference pattern 31, as shown in Figs. 4 and 5, may be formed by sputtering an aluminum thin film or etching on the surface of the phase interference element 30.
  • the surface interference pattern 31 has a surface coherence length, denoted by Pr, which is smaller than the diameter of the laser beam 110, 111 or 112 incident on the phase interference pattern 31, wherein the diameters of the laser beams 110, 111 and 112 are defined as The circle defined by the diameter can contain 99% of the energy of the laser beam.
  • the phase interference pattern 31 has a surface coherence length (Pr) which is smaller than a surface coherence length of the surface of the laser beam projection system 1 in which the laser beam 110, 111 or the imaging beam 112 passes over its projection path ( Correlation length ) , any surface containing a mirror surface of a microelectromechanical mirror ( MEMS mirror ) ( 13 ) as shown in FIG.
  • the coherence length is a parameter for defining a frequency of change of a distribution state
  • the surface coherence length, represented by Pr is used to represent a height variation frequency of a surface roughness, defined as a two-dimensional pattern.
  • R represents the distance in space; wherein the smaller the coherence length of the surface, the more the surface roughness distribution is denser within the unit length, the better the suppression of the laser spot is.
  • the correlation length of the rough surface refer to JA Ogilvy, Theory of Waves scattering from random rough surfaces"; Petry Beckmann and Andre Spizzichino, The scattering of Electromagnetic Waves from random rough surface”; and Joseph W Goodman's, Speckle Phenomena in Optics: Theory and Application"; If the phase change of the beam section is substituted for the change in the height of the rough surface in the above definition, the same mathematical model can be used to obtain the definition of the coherence length of the beam section.
  • Coherence length is a parameter, used to table A phase change on a beam section is shown.
  • the coherence length of the beam section is small, it indicates that the phase distribution of the beam section produces more and dense phase changes in the unit cross-sectional area.
  • the coherence length of the section of the imaging beam is smaller, the suppression effect of the laser spot is better.
  • the at least one phase interference component 30 can be disposed at the following position according to design or assembly requirements: the laser beam projection path between the laser light source 1 1 and the beam deflecting device 13 is deflected by the beam The mirror surface of the device 13 and the imaging beam 112 between the beam deflecting device 13 and the screen 20 are projected on at least one of the positions, such as a selective cover disposed on the light exit port 14 for imaging the light beam 12 After being penetrated, the external scan is projected onto the screen 20 to form an image frame; or the cover is disposed on the surface of the screen 20 such that the image frame passes through the phase interference pattern 31 of the phase interference element 30 in a penetrating manner. Received by the human eye.
  • the phase interference component 30 can be a transmissive component, that is, the phase interference component 30 is made of a transparent material, and the laser beam 1 10, 1 1 1 or the imaging beam 1 12 (wavelength is ⁇ ) is penetrated. Passing the phase interference pattern 31 of the phase interference component 30, and generating a phase difference variation of at least ⁇ after the penetration passes, so that the laser beam or the imaging beam can cause constructive or destructive interference changes to suppress The laser spot generated on the image screen.
  • the phase interference component 30 can be a reflective component, that is, the phase interference component 30 is made of a non-transparent material and forms a reflective surface, or a transparent phase interference component 30 is flatly pasted on the microelectromechanical as shown in FIG. Formed on the mirror surface of the mirror ( MEMS mirror ) ( 13 ), at which time the laser beam 1 10, 1 1 1 or the imaging beam 1 12 passes through the phase interference pattern 31 of the phase interference element 30 in a reflective manner and is reflective After the passage, a phase difference variation of at least ⁇ is generated, that is, the phase interference pattern 31 incident on and out of the phase interference element 30 can respectively generate a phase difference variation of at least ⁇ /2, so that the laser beam or the imaging beam can be constructive or Destructive interference changes to suppress the laser spot generated on the image.
  • FIG. 6 is a schematic diagram of an embodiment of the phase interference component 30 of the present invention in cooperation with a MEMS mirror (13).
  • the phase interference component 30 can be coupled to a MEMS mirror (13) packaging process, such as a conventional TO-can package, and disposed in the microelectromechanical mirror (13), which is a beam deflecting device.
  • a type of 13 is provided on the inner side of the transparent protective cover 131, but is not limited to as shown in FIG. 6, so that the laser beam 11 1 first penetrates through the phase interference pattern 31 of a correspondingly disposed phase interference element 30.
  • phase interference component 30 that is, the phase interference components 30 and 30a are simultaneously disposed when the microelectromechanical mirror (13) is manufactured or packaged; and the phase interference components 30 and 30a are disposed correspondingly It may be separately provided, or integrated, but not limited, and may be attached to the inner side of the transparent protective cover 131 of the microelectromechanical mirror (13) at one time as shown in FIG.
  • the laser beam 110, 111 or the imaging beam 112 passes through the phase interference pattern 31 of the phase interference element 30 in a reflective manner or in a penetrating manner, an uneven spatial phase change can be generated, and the image finally emitted from the screen 20 can be generated.
  • the coherence length of the beam section of the imaging light of the picture is reduced to suppress the laser spot generated on the image frame; wherein the coherence length of the beam section of the imaging light of the image picture is a parameter for indicating a beam
  • the phase change situation on the cross section When the coherence length of the beam section is small, it indicates that the phase distribution of the beam section produces more and dense phase changes in the unit sectional area. When the coherence length of the section of the imaging beam is small, the suppression effect of the laser spot is better.
  • the laser beam 111 is incident on the micro-electromechanical mirror through a phase interference pattern 31 of the correspondingly disposed phase interference element 30 at a certain angle of incidence.
  • the mirror surface is scanned by the microelectromechanical mirror (13) at a scanning angle to form the imaging beam 112 and then penetrates through the phase interference pattern 31 of the other correspondingly disposed phase interference element 30 (30a).
  • Projection, i.e., the exit angle of the imaging beam 112 is reciprocally scanned between a predetermined scan amplitude, such that the imaging beam 112 penetrates the phase of the phase interference element 30 (30a) over time (i.e., at different times).
  • the contrast of the laser spot is further reduced or suppressed by time averaging in terms of the visual retention time observed by the human eye.
  • the embodiment shown in FIG. 6 is taken as an example for illustration and not limitation.
  • the imaging beam 112 changes in time (ie, at different times) and passes through different angles of incidence, such as ⁇ 1, ⁇ 2 in FIG.
  • the phase of the phase interference element 30a interferes with the pattern 31, so that the contrast of the laser spot is further suppressed by time averaging in terms of the visual retention time observed by the human eye.
  • FIG. 7 is a schematic diagram of an embodiment of the laser projection system shown in FIG. 2.
  • the laser projection system 1 is used to illustrate the technical features of the present invention but is not intended to limit the present invention.
  • the laser projection system 1 includes a laser projector 10 and a screen 20, wherein the laser projector 10 mainly includes at least one laser light source 11 for emitting a laser beam 110 and at least one image generating component 13, wherein A light combining module 12 may be disposed between the laser light source 11 and the image generating element 13 but is not limited to form the laser light 110 into a laser beam 111.
  • the image generating component 13 is a group of the following groups: DLP (Digital Light Processor), LCOS (Liquid Crystal On Silicon), hologram (Hologram) one, but not limited, for forming a laser beam 110 or 111 into an imaging beam 112, which is then projected by at least one light exit 14 onto a screen 20 to form an image; The screen is then emitted from the screen 20 and received by the human eye.
  • DLP Digital Light Processor
  • LCOS Liquid Crystal On Silicon
  • Hologram hologram
  • the spot suppression device 3 of the present embodiment is substantially the same as the embodiment shown in FIG. 3, and the main difference is that the imaging mode and the technical architecture of the image generating element 13 are different; therefore, the spot suppression device 3 of the present embodiment also utilizes at least one laser.
  • the optical phase interference element 30 is disposed on a projection path of the laser beam 110, 111 or the imaging beam 112 between the laser light source 11 and the screen 20 for the laser beam 110, 111 or the imaging beam 112 to pass.
  • the structural characteristics and operational functions of the phase interference element 30 and the phase interference pattern 31 provided on the surface thereof are the same as those in the first embodiment shown in Fig. 3.
  • the at least one phase interference component 30 can be disposed at the following position according to design or assembly requirements: the image generating element 13 on the laser beam projection path between the laser light source 1 1 and the image generating component 13
  • the image generating element 13 on the laser beam projection path between the laser light source 1 1 and the image generating component 13
  • at least one position such as a selective cover
  • the external scan is projected onto the screen 20 to form an image frame
  • the cover is disposed on the surface of the screen 20 such that the image frame passes through the phase interference pattern 31 of the phase interference element 30 in a penetrating manner.
  • the human eye receives a cover such as a cover on the light exit opening 14 for the imaging light beam 112 to pass through and then scans outward onto the screen 20 to form an image frame.
  • the laser beam 110, 111 or the imaging beam 112 passes through the phase interference pattern 31 of the phase interference element 30 in a reflective manner or in a penetrating manner, an uneven spatial phase change can be generated, and the image finally emitted from the screen 20 can be generated.
  • the coherence length of the imaging light of the picture is reduced, thereby suppressing the laser spot generated on the image frame; wherein the coherence length is a parameter for defining a frequency of change of a distribution state; wherein the image
  • the coherence length of the beam section of the imaged light of the picture is a parameter used to represent the phase change on a beam section. When the coherence length of the beam section is small, it indicates that the phase distribution of the beam section produces more dense phase changes in the unit cross-sectional area. When the coherence length of the section of the imaging beam is small, the suppression effect of the laser spot is better.
  • the phase interference pattern 31 can be represented by a length period Px and Py, and the height variation h range should be greater than a quarter wavelength ⁇ (the wavelength of the laser beam or the imaging beam is ⁇ )
  • the relationship between the laser spot contrast and the roughness of the surface of the screen is defined as a relationship of the length (defined as Is).
  • the laser spot contrast is rough with the surface of the screen.
  • the coherence length of the laser spot contrast and the roughness of the screen surface (defined as Is) comparison chart as can be seen from Fig. 9, after adding a two-dimensional phase interference element 30, the contrast of the laser spot is significantly reduced, and the laser spot contrast is lower than 75. It is apparent that the spot suppression device of the present invention and the suppression method thereof can achieve the specific effects of suppressing the laser spot.
  • the laser spot projection method of the laser projection system of the present invention wherein the laser projection system 1 comprises a laser projector 10 and a screen 20, wherein the laser projector 10 mainly comprises at least one laser light source 11 for emitting the laser beam 110 and at least one An image generating component 13 , wherein a light combining module 12 is disposed between the laser light source 11 and the image generating component 13 , but the laser beam 110 is not limited to form a laser beam 111; the image generating component 13 can The laser beam 110 or 111 is formed into an imaging beam 112 to be projected onto the screen 20 by at least one light exit 14 of the laser projector 10 to form an image for viewing by the human eye.
  • the laser spot suppression method comprises the following steps:
  • the mode can generate an uneven phase change when passing through the phase interference pattern 31;
  • the at least one phase interference component 30 is disposed on a projection path between the laser light source 11 and the screen 20 such that the laser beam 110, 11 or the imaging beam 112 can reflect or penetrate before being projected onto the screen 20.
  • the mode first passes through the phase interference pattern 31 of the at least one phase interference component 30;
  • phase interference pattern 31 By using the phase interference pattern 31, a non-uniform phase change is generated for the laser beam 110, 111 or the imaging beam 112 passing through the phase interference pattern 31, and the coherence length of the image image of the image image finally emitted by the screen 20 is reduced. Suppressing the generation of a laser spot on the image frame;
  • the coherence length is a parameter for defining a frequency of change of a distribution state; wherein a coherence length of the beam section of the image light of the image frame is a parameter indicating a phase change on a beam section .
  • the coherence length of the beam section is small, it indicates that the phase distribution of the beam section produces more and dense phase changes in the unit cross-sectional area.
  • the coherence length of the imaging beam section is small, the suppression effect of the laser spot is better.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Projection Apparatus (AREA)
  • Holo Graphy (AREA)

Abstract

L'invention porte sur un dispositif de réduction du chatoiement pour un système de projection à laser (1) et un sur un procédé de réduction du chatoiement l'utilisant. Le système de projection à laser (1) comprend au moins une source de lumière laser (11) pour émettre une lumière laser (110), et au moins un élément de génération d'image (13), tel qu'un déflecteur de lumière tel qu'un miroir à système micro-électro-mécanique ou un groupement de modulation d'intensité en deux dimensions tel qu'un processeur de lumière numérique (DLP), pour moduler la lumière laser (110) sous la forme d'une lumière d'image (112). La lumière d'image (112) est projetée sur un écran (20) par l'intermédiaire d'au moins une sortie de lumière (14) de façon à former une image. Le dispositif de réduction du chatoiement (3) utilise au moins un élément de perturbation de phase de laser (30) disposé dans une trajectoire de projection de la lumière laser entre la source de lumière laser (11) et l'écran (20) pour la lumière laser passant dans un mode de réflexion ou de transmission. Au moins un motif de perturbation de phase (31) est disposé sur une surface de l'élément de perturbation de phase (30) afin de générer un changement de phase irrégulier dans la lumière laser traversant le motif de perturbation de phase (31), de telle sorte qu'au moins la longueur de cohérence de la lumière d'image émise à partir de l'écran (20) est réduite de façon à réduire efficacement le chatoiement.
PCT/CN2011/000424 2011-03-17 2011-03-17 Dispositif de réduction du chatoiement pour système de projection à laser et procédé de réduction du chatoiement l'utilisant WO2012122677A1 (fr)

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WO2014059552A1 (fr) 2012-10-17 2014-04-24 Optotune Ag Projection laser dépourvue de tavelures
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WO2014059552A1 (fr) 2012-10-17 2014-04-24 Optotune Ag Projection laser dépourvue de tavelures
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