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WO2006063577A1 - Procede et projecteur pour la projection d'images - Google Patents

Procede et projecteur pour la projection d'images Download PDF

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Publication number
WO2006063577A1
WO2006063577A1 PCT/DE2005/002265 DE2005002265W WO2006063577A1 WO 2006063577 A1 WO2006063577 A1 WO 2006063577A1 DE 2005002265 W DE2005002265 W DE 2005002265W WO 2006063577 A1 WO2006063577 A1 WO 2006063577A1
Authority
WO
WIPO (PCT)
Prior art keywords
image
projection
scanner
projection beam
current position
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE2005/002265
Other languages
German (de)
English (en)
Inventor
Ulrich Hofmann
Georgios Fakas
Joachim Janes
Peter Blicharski
Bernd Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Publication of WO2006063577A1 publication Critical patent/WO2006063577A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
    • H04N5/7458—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being an array of deformable mirrors, e.g. digital micromirror device [DMD]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners

Definitions

  • the present invention relates to a method for image projection and to an image projector in which a projection beam is intensity-modulated and guided by deflection on a biaxial scanner to produce an image over a projection surface.
  • the horizontal movement and vertical movement must be synchronized with each other so that each image has an identical number of lines.
  • the fast line movement of the scanner is operated in a resonant manner, so that the required deflection angles are achieved by the resonance overshoot. Since such a resonant oscillating system can not be readjusted or corrected quickly enough in the case of a phase deviation (frequency shift), it is necessary to adapt the slow vertical motion to the movement of the fast axis. However, the slow axis does not have to be operated resonantly, so that the effect of the
  • Micromechanically produced scanners like any other mechanical product, have a certain amount of parameter dispersion. With reference to the resonant frequency, however, this means that every display constructed with such a scanner has to be calibrated.
  • the control and synchronization electronics of scanner and light source must be tuned very accurately to the resonant frequency of the scanner. The required effort on the electronics side can be very high under certain circumstances. The same applies to the working hours required. Both stand in the way of cost-effective mass production.
  • High image resolution requires large optical scan angles given the diameter of the projection beam. In order to be able to achieve this, it is necessary, based on the resonantly operated line deflection, to achieve the highest possible resonance peaking or a high mechanical quality factor Q.
  • the American manufacturer Microvision calls for its resonance scanner a quality factor of> 20,000.
  • a quality factor of> 20,000 At the same time, however, such a high quality means that the resonance pattern in the frequency spectrum is extremely sharp. This means that the high resonance peak is only achieved if the drive frequency is extremely precise is matched to the sharp maximum of the resonance curve. A slight deviation of the drive frequency from the resonance frequency leads immediately to a significant decrease in the scan amplitude due to the large steepness.
  • a high quality factor also results in an enormous steepness of the phase frequency response.
  • phase angle 0 °
  • phase angle 180 °
  • the object of the present invention is to specify a method for image projection and an image projector in which the image quality is less sensitive to fluctuating environmental conditions.
  • a projection beam is intensity modulated and guided by deflection on a biaxial scanner to produce an image over a projection surface.
  • the method is characterized in that during the image projection in each case a momentary
  • Position value is determined, which is associated with a current position of the projection beam on the projection surface, a local image information associated with the current position is read from an image memory and the projection beam is adjusted in intensity according to the read-out local image information.
  • the associated image projector comprises a first light source for a projection beam, a
  • the image projector comprises a position measuring device for determining an instantaneous position value which is assigned to a current position of the projection beam on a projection surface, and a control unit having an image memory which is connected to the position measuring device and the modulation device is configured such that it reads out a local image information assigned to the current position from the image memory and controls the modulation device in accordance with the read-out local image information.
  • Micromirror scanner with a two-axis adjustable micromirror explained in detail, but without being limited to micromirror scanner. Instead of a micromirror scanner, other biaxial scanners can also be used.
  • the scanner does not always have to be a reflective beam deflection system.
  • a transmissive beam deflection system can also be used, for example based on two lenses which are suitably displaced relative to one another.
  • the present method is a scanning projection method in which the image projector can be operated in almost any manner with respect to the deflection parameters.
  • the generation of the image on the projection surface can be done not only in the raster scan method but, for example, also in the Lissajous scan method.
  • the light source in the present method is not modulated by a precalculated sequence of pixel data, ie intensity values within a line. Rather, a fast
  • Position measuring device used to determine at each moment of the image projection a, the exact position of the projection beam on the projection surface associated position value.
  • a local image information associated with the current position in particular a pixel value of the pixel which the projection beam currently traverses on the projection surface, is read from an image memory.
  • the projection beam is set in intensity according to the read-out local image information.
  • the scanning geometry, d. H. the path on which the projection beam is guided over the projection surface is insignificant.
  • the present method, as well as the associated image projector thus always generate the image points at the correct location, irrespective of possible disturbances of the micromirror scanner or interfering influences on this scanner, so that no distortions caused by such disturbances occur.
  • the local image information corresponds to the image information that is to be displayed at a specific pixel within the image.
  • This is usually gray scale information, in the simplest case a simple Dark information in the form of the bit values 1 or 0.
  • the image information may additionally contain color information.
  • the projection beam is set in intensity via the modulation device. The same is carried out for the next determined position of the projection beam, wherein the position determination preferably takes place continuously or at very short time intervals, in which the projection beam, depending on the resolution to be displayed, moves no more than one pixel on the projection surface. In this way, the projection beam is modulated as a function of the respectively determined position and the image information assigned to this position.
  • instantaneous two-dimensional position values are thus determined during the image projection continuously or at very short time intervals in which the projection beam travels in dependence on a resolution to be displayed by one pixel on the projection surface each associated with a current position of the projection beam on the projection surface, each one of the current position of the projection beam associated local image information based on the determined position value read from an image memory and set the projection beam according to the read local image information in intensity.
  • the instantaneous position of the micromirror is preferably detected, from which this position on the projection surface, which corresponds to the image surface of the image to be displayed, can be derived.
  • the respective instantaneous position of the micromirror is detected via a measuring beam which impinges on the micromirror on an axis other than the projection beam and is directed onto a position-sensitive detector.
  • the instantaneous position of the projection beam on the projection surface can be determined at any time via the position signal of the position-sensitive detector.
  • the enormous advantage of the present method is that the scanner is the projection beam basically in any way over the screen can lead and yet each pixel is always projected in the right place with the right brightness, if the scanner completely covers the screen. If, for example, fluctuating ambient temperatures occur, which result in changed deflections of the micromirror, then the unambiguous assignment of each pixel to a defined solid angle of the projection is not disturbed.
  • Vsync, Hsync and Pixelclock on the other hand, there is a possibility of reaction in case of disturbances only from line to line. Within a line, it is therefore possible for image information to be distorted. This does not occur in the present process.
  • both axes of the micromirror scanner can be operated resonantly in order to exploit the resonance increase by the quality factor in both axes.
  • the scanner is always operated in its fundamental modes without having to force the projection beam onto a fixed path.
  • This mode of operation achieves the maximum excursion of the micromirror in both axes and thus a clear improvement in terms of resolution and image size.
  • this approach guarantees reliable operation even if the mechanical properties of the oscillator (scanner) should change, for example Temperature change.
  • the oscillator scanner
  • Lissajous scan figures are written which, depending on the frequency division ratio of the two axes, result in a high or low line density in the image.
  • the phase angle of the two axes can be specifically tuned to each other in order to complete a number of mutually offset partial images to a dense overall picture.
  • a defective micromirror scanner can be replaced by a new micromirror scanner without further calibration measures, which generally does not have the identical characteristic shafts due to the unavoidable specimen scattering. This is made possible by the independence of the present image projection from the deflection properties of the micromirror scanner.
  • Image projector means that external vibration or shock to the scanner does not interfere with the image, as is the case with conventional synchronization techniques.
  • the oscillation forced by the disturbance can be used just as well for image projection as the usually used electrostatic excitation of the micromirror.
  • Fig. 1 is a schematic representation of
  • FIG. 2 is a schematic representation of individual units of an exemplary image projector according to the present invention.
  • FIG 3 shows an example of an application of the present image projector.
  • FIG. 1 shows a schematic representation of a 2D scanner chip 1, which forms the micro-mirror scanner (MEMS scanner) of the present image projector.
  • the micromirror 2 is formed, which is deflected by two perpendicular axes by electrostatic actuation.
  • this mirror which is a mechanical oscillator with respect to each axis, can be operated in resonance in order to achieve maximum deflections.
  • a projection beam 3 which is directed onto the micromirror 2 by a modulated light source 4, for example a laser diode, is guided over a projection surface (not shown).
  • a second light source 5 which may also be realized by a laser diode provided as part of the image projector.
  • This second light source 5 emits a measuring beam 6, which is also directed at a different angle to the micromirror 2 and deflected by it. The deflection takes place on a two-dimensional, position-sensitive detector 7 arranged at the corresponding point.
  • This position-sensitive detector 7 delivers a signal which depends on the point of impact of the measuring beam 6 on the detector surface. From this signal, the x and y position of the measuring beam 6 on the detector surface can be determined. By a fixed assignment between these landing positions and the position of the projection beam 3 on the
  • this position can also be derived from the signal of the position-sensitive detector 7.
  • the two light sources 4, 5 are of course arranged rigidly and aligned.
  • Figure 2 shows an example of the individual units of an image projector, with which the present method is feasible.
  • the light source for the image projection forms a laser unit 8 together with the modulation device.
  • the modulated projection beam 3 generated by this laser unit 8 impinges on the micromirror 2 of the micromirror scanner and is deflected by the latter onto a projection surface (not shown).
  • the measuring beam 6 is directed via the further light source 5 via the micromirror 2 onto the position-sensitive detector 7.
  • the four leakage currents are processed in an analog signal conditioning in block 14 to normalized x- or y-position signals (according to the scheme (X2-Xl) / (X2 + X1), if X2 and Xl represent the two partial currents in the x direction ).
  • Analog signals are digitized in an analog-to-digital converter 9 and directly respond to the image memory module 10 described with image information. At the output of the addressed memory cell is now the information "1" or "0". With this signal, the modulation device of the laser unit 8 is controlled via the control unit 11 in order to adjust the intensity of the light source accordingly.
  • an image memory is used, which has two ports and can be simultaneously described and read out.
  • This data processing takes place in real time during operation of the image projector. While the projection beam crosses the position of a certain pixel on the projection surface, the electronics accesses the image memory with the aid of the determined x and y position and asks whether or not the corresponding image memory element is set in a one-bit representation , If the image memory element is set, then the laser is turned on. If the image memory element is not set, the laser remains off.
  • the coding can also be correspondingly inverted or transferred without restriction to a gray value representation. Accordingly, not a single bit is read from the image memory, but a data word consisting of a greater number of bits (e.g., 8, 12, 16, etc.) to adjust the brightness of the light source with the modulator. In the case of color information, such gray values, for example in the case of an RGB system, must be read out for each of the color channels involved in the color representation.
  • FIG. 3 shows a possible use of the present image projector in a mobile telephone 12 with which the image can then be projected onto a currently available surface in a sufficient size (projection surface 13).

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

La présente invention concerne un procédé ainsi qu'un projecteur d'images pour la projection d'images, dans lesquels l'intensité d'un faisceau de projection (3) est modulée et ce faisceau est dirigé par déviation vers un dispositif de balayage biaxe pour la production d'une image sur une surface de projection (13). Pendant la projection d'images, une valeur de position instantanée est déterminée, laquelle valeur est associée à une position instantanée du faisceau de projection (3) sur une surface de projection (13) ; une information d'image locale associée à cette position instantanée est extraite d'une mémoire d'images (10) et l'intensité du faisceau de projection (3) est réglée en fonction de l'information d'image locale extraite. Le procédé selon l'invention et le projecteur d'images associé permettent d'obtenir une qualité d'image moins sensible à des perturbations extérieures du dispositif de balayage à micromiroirs.
PCT/DE2005/002265 2004-12-16 2005-12-15 Procede et projecteur pour la projection d'images Ceased WO2006063577A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004060576.9A DE102004060576B4 (de) 2004-12-16 2004-12-16 Verfahren und Projektor zur Bildprojektion
DE102004060576.9 2004-12-16

Publications (1)

Publication Number Publication Date
WO2006063577A1 true WO2006063577A1 (fr) 2006-06-22

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DE (1) DE102004060576B4 (fr)
WO (1) WO2006063577A1 (fr)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007011425A1 (de) * 2007-03-08 2008-09-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Projektionsvorrichtung zum scannenden Projizieren
DE102007032801A1 (de) 2007-07-10 2009-01-15 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zum Projizieren elektromagnetischer Strahlung
EP2208354A4 (fr) * 2007-10-10 2010-12-22 Gerard Dirk Smits Projecteur d'image avec suivi de lumière réfléchie
WO2011082789A1 (fr) * 2009-12-14 2011-07-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Dispositif déflecteur pour un équipement de projection, équipement de projection destiné à projeter une image et procédé de commande d'un dispositif déflecteur pour un équipement de projection
US20120105477A1 (en) * 2010-11-01 2012-05-03 Samsung Electronics Co., Ltd. Apparatus and method for displaying data in portable terminal
US8573783B2 (en) 2010-03-01 2013-11-05 Gerard Dirk Smits Safety device for scanned projector and illumination systems
US8711370B1 (en) 2012-10-04 2014-04-29 Gerard Dirk Smits Scanning optical positioning system with spatially triangulating receivers
US8971568B1 (en) 2012-10-08 2015-03-03 Gerard Dirk Smits Method, apparatus, and manufacture for document writing and annotation with virtual ink
US9377533B2 (en) 2014-08-11 2016-06-28 Gerard Dirk Smits Three-dimensional triangulation and time-of-flight based tracking systems and methods
US9753126B2 (en) 2015-12-18 2017-09-05 Gerard Dirk Smits Real time position sensing of objects
US9813673B2 (en) 2016-01-20 2017-11-07 Gerard Dirk Smits Holographic video capture and telepresence system
US9810913B2 (en) 2014-03-28 2017-11-07 Gerard Dirk Smits Smart head-mounted projection system
US9946076B2 (en) 2010-10-04 2018-04-17 Gerard Dirk Smits System and method for 3-D projection and enhancements for interactivity
US10043282B2 (en) 2015-04-13 2018-08-07 Gerard Dirk Smits Machine vision for ego-motion, segmenting, and classifying objects
US10067230B2 (en) 2016-10-31 2018-09-04 Gerard Dirk Smits Fast scanning LIDAR with dynamic voxel probing
US10261183B2 (en) 2016-12-27 2019-04-16 Gerard Dirk Smits Systems and methods for machine perception
US10379220B1 (en) 2018-01-29 2019-08-13 Gerard Dirk Smits Hyper-resolved, high bandwidth scanned LIDAR systems
US10473921B2 (en) 2017-05-10 2019-11-12 Gerard Dirk Smits Scan mirror systems and methods
US10591605B2 (en) 2017-10-19 2020-03-17 Gerard Dirk Smits Methods and systems for navigating a vehicle including a novel fiducial marker system
US11829059B2 (en) 2020-02-27 2023-11-28 Gerard Dirk Smits High resolution scanning of remote objects with fast sweeping laser beams and signal recovery by twitchy pixel array
US12025807B2 (en) 2010-10-04 2024-07-02 Gerard Dirk Smits System and method for 3-D projection and enhancements for interactivity

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DE102012219666B4 (de) 2012-10-26 2023-06-22 Robert Bosch Gmbh Projektionsvorrichtung und Verfahren zum Betreiben einer Projektionsvorrichtung
DE102018209886B4 (de) 2018-06-19 2020-02-27 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Einrichtung zur Projektion eines Laserstrahls zur Erzeugung eines Bildes auf der Netzhaut eines Auges und Brilleneinrichtung mit zwei derartigen Einrichtungen
DE102019207073B4 (de) 2019-05-15 2021-02-18 OQmented GmbH Bilderzeugungseinrichtung für ein scannendes Projektionsverfahren mit Bessel-ähnlichen Strahlen
DE102023119177A1 (de) 2023-07-20 2025-01-23 OQmented GmbH Sendervorrichtung und Empfängervorrichtung für einen Projektor

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Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007011425A1 (de) * 2007-03-08 2008-09-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Projektionsvorrichtung zum scannenden Projizieren
US7847997B2 (en) 2007-03-08 2010-12-07 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Projection apparatus for scanningly projection
DE102007032801A1 (de) 2007-07-10 2009-01-15 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zum Projizieren elektromagnetischer Strahlung
EP3836539A1 (fr) * 2007-10-10 2021-06-16 Gerard Dirk Smits Projecteur d'image avec suivi de lumière réfléchie
US10962867B2 (en) 2007-10-10 2021-03-30 Gerard Dirk Smits Method, apparatus, and manufacture for a tracking camera or detector with fast asynchronous triggering
EP2208354A4 (fr) * 2007-10-10 2010-12-22 Gerard Dirk Smits Projecteur d'image avec suivi de lumière réfléchie
US8282222B2 (en) 2007-10-10 2012-10-09 Gerard Dirk Smits Image projector with reflected light tracking
US9581883B2 (en) 2007-10-10 2017-02-28 Gerard Dirk Smits Method, apparatus, and manufacture for a tracking camera or detector with fast asynchronous triggering
US8430512B2 (en) 2007-10-10 2013-04-30 Gerard Dirk Smits Photonjet scanner projector
US8696141B2 (en) 2007-10-10 2014-04-15 Gerard Dirk Smits Method, apparatus, and manufacture for a tracking camera or detector with fast asynchronous triggering
WO2011082789A1 (fr) * 2009-12-14 2011-07-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Dispositif déflecteur pour un équipement de projection, équipement de projection destiné à projeter une image et procédé de commande d'un dispositif déflecteur pour un équipement de projection
US9151949B2 (en) 2009-12-14 2015-10-06 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Deflection device for a projection apparatus, projection apparatus for projecting an image and method for controlling a deflection apparatus for a projection apparatus
JP2013513828A (ja) * 2009-12-14 2013-04-22 フラウンホッファー−ゲゼルシャフト・ツァー・フォデラング・デル・アンゲワンテン・フォーシュング・エー．ファウ． 投射装置用の偏向装置、画像を投射する投射装置、及び、投射装置用の偏向装置を制御する方法
US8573783B2 (en) 2010-03-01 2013-11-05 Gerard Dirk Smits Safety device for scanned projector and illumination systems
US9946076B2 (en) 2010-10-04 2018-04-17 Gerard Dirk Smits System and method for 3-D projection and enhancements for interactivity
US12025807B2 (en) 2010-10-04 2024-07-02 Gerard Dirk Smits System and method for 3-D projection and enhancements for interactivity
US9245469B2 (en) * 2010-11-01 2016-01-26 Samsung Electronics Co., Ltd. Apparatus and method for displaying data in portable terminal
US10102786B2 (en) 2010-11-01 2018-10-16 Samsung Electronics Co., Ltd. Apparatus and method for displaying data in portable terminal
US20120105477A1 (en) * 2010-11-01 2012-05-03 Samsung Electronics Co., Ltd. Apparatus and method for displaying data in portable terminal
US8711370B1 (en) 2012-10-04 2014-04-29 Gerard Dirk Smits Scanning optical positioning system with spatially triangulating receivers
US9501176B1 (en) 2012-10-08 2016-11-22 Gerard Dirk Smits Method, apparatus, and manufacture for document writing and annotation with virtual ink
US8971568B1 (en) 2012-10-08 2015-03-03 Gerard Dirk Smits Method, apparatus, and manufacture for document writing and annotation with virtual ink
US9810913B2 (en) 2014-03-28 2017-11-07 Gerard Dirk Smits Smart head-mounted projection system
US10061137B2 (en) 2014-03-28 2018-08-28 Gerard Dirk Smits Smart head-mounted projection system
US9377533B2 (en) 2014-08-11 2016-06-28 Gerard Dirk Smits Three-dimensional triangulation and time-of-flight based tracking systems and methods
US10324187B2 (en) 2014-08-11 2019-06-18 Gerard Dirk Smits Three-dimensional triangulation and time-of-flight based tracking systems and methods
US11137497B2 (en) 2014-08-11 2021-10-05 Gerard Dirk Smits Three-dimensional triangulation and time-of-flight based tracking systems and methods
US10157469B2 (en) 2015-04-13 2018-12-18 Gerard Dirk Smits Machine vision for ego-motion, segmenting, and classifying objects
US10325376B2 (en) 2015-04-13 2019-06-18 Gerard Dirk Smits Machine vision for ego-motion, segmenting, and classifying objects
US10043282B2 (en) 2015-04-13 2018-08-07 Gerard Dirk Smits Machine vision for ego-motion, segmenting, and classifying objects
US10502815B2 (en) 2015-12-18 2019-12-10 Gerard Dirk Smits Real time position sensing of objects
US10274588B2 (en) 2015-12-18 2019-04-30 Gerard Dirk Smits Real time position sensing of objects
US9753126B2 (en) 2015-12-18 2017-09-05 Gerard Dirk Smits Real time position sensing of objects
US11714170B2 (en) 2015-12-18 2023-08-01 Samsung Semiconuctor, Inc. Real time position sensing of objects
US10084990B2 (en) 2016-01-20 2018-09-25 Gerard Dirk Smits Holographic video capture and telepresence system
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