WO2009003510A1 - Objectif pour projection à laser - Google Patents

Objectif pour projection à laser Download PDF

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Publication number
WO2009003510A1
WO2009003510A1 PCT/EP2007/056576 EP2007056576W WO2009003510A1 WO 2009003510 A1 WO2009003510 A1 WO 2009003510A1 EP 2007056576 W EP2007056576 W EP 2007056576W WO 2009003510 A1 WO2009003510 A1 WO 2009003510A1
Authority
WO
WIPO (PCT)
Prior art keywords
projection system
mirror
projection
lens
distortion
Prior art date
Application number
PCT/EP2007/056576
Other languages
German (de)
English (en)
Inventor
Henning Rehn
Oliver Drumm
Original Assignee
Osram Gesellschaft mit beschränkter Haftung
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 Osram Gesellschaft mit beschränkter Haftung filed Critical Osram Gesellschaft mit beschränkter Haftung
Priority to PCT/EP2007/056576 priority Critical patent/WO2009003510A1/fr
Priority to TW097124119A priority patent/TW200909975A/zh
Publication of WO2009003510A1 publication Critical patent/WO2009003510A1/fr

Links

Classifications

    • 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
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G02B27/0031—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration for scanning purposes
    • 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
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV

Definitions

  • the present invention relates to a device and a method for correcting nonlinearities arising from movements of light deflecting devices, in particular the variable speed of a projected onto a screen spot, laser projection systems, and a projection system, in particular a Laserpro ⁇ jetechnischssystem with such a device.
  • the projection beam generated by the laser must be moved at a very high speed on the projection plane to produce the image.
  • a rapidly rotating polygonal mirror for the Zeilenab ⁇ steering and an oscillating mirror for the horizontal Ablen ⁇ effect is used for example.
  • the power of the lasers at the reversal points, ie toward the edge of the image, is reduced in relation to the value in the center of the image. Because of this dimming of the order ⁇ periodic points a light loss of up to 60% is produced.
  • DE 10 2004 027 674A1 proposes to compensate for the non-linearities of the mirror oscillations by correspondingly adapting the time span during which the energy used for the representation of a pixel is emitted.
  • Kings ⁇ NEN example be adjusted when using a pulsed La ⁇ serstrahls the time intervals between the pulses. Since one pixel is generated from a plurality of pulses, its brightness can be controlled by the number of pulses generated by the pixels.
  • the object of the present invention is, therefore, an on ⁇ direction and provide a method by which the efficiency of a laser projection system is increased by reducing dimming losses.
  • This object is achieved by an apparatus and a method for compensating at least one nonlinearities ty which result from movement of a Lichtablenkeinrich-, in particular at a vibration of at least one deflection mirror in a laser projection system is formed, - in particular from variations in a Spotge ⁇ speed of a projection - wherein the pre ⁇ direction, a lens system having at least one lens comprises up, which provides a distortion that compensates for the nonlinearity, and a projection system comprising such a device.
  • the inventive Upstream of Linsensys ⁇ tems - that a lens - between the mirror and process jekomsebene can be achieved that the distortion of the lens system, the speed fluctuations of a spot completely or partially eliminated.
  • ⁇ acts so the distortion, that the amount of Ge ⁇ speed of the image projected on a screen spots is constant or at least minor variations on ⁇ has, as in the prior art.
  • temporally equidistant pixels are generated, so that even with variable mirror speed and constant laser power have the same brightness on ⁇ by the laser pixels generated.
  • the lens system can consist of a single lens, but is advantageously made up of several lenses.
  • cylindrical lenses can also be used.
  • the distortion of the image is tuned to the greater of the angular amplitudes.
  • the mirror itself is preferably a micromirror oscillating in two axes, which may preferably have a size of 0.5 mm to 1.5 mm.
  • the distortion along one direction of the spot movement may be provided by means of the lens system while along the other axis the varying pixel brightness is compensated electronically as in the prior art, ie by reducing the laser power at the image edge.
  • This has the advantage that the rapid movement of the lens system is corrected, in particular at different velocities along the axes ⁇ union, while along the slow moving direction of the light intensity is dimmed. This can increase the efficiency the light output can be increased by more than 20%.
  • a cylinder lens system can be used.
  • the lens system provides a positive or negative angular magnification.
  • a higher total luminous flux can be permitted because they ultimately relate to the maximum luminance in the projection system and reduce the luminance at the same luminous flux compared to the original double angle amplitude of the mirror oscillation by imaging enlarged projection angles.
  • laser projection systems comprising a plurality of laser sources of different wavelength.
  • Such laser projection systems can be designed as individual devices or in mobile phones, digital cameras, Embedded camcorder, PDA or multimedia playback devices.
  • Fig. 1 is a schematic representation of a temporal
  • 3 is a schematic representation of a preferred embodiment of the invention according Kom ⁇ compensation of the variable spot speed leading distortion for different Winkelampli- tuden the mirror oscillation; 4 shows a schematic representation of the image projected onto a screen without an objective and with an objective providing the distortion according to the invention;
  • Fig. 5 shows a first, particularly preferred mattersbei ⁇ game for an inventive lens system for monochromatic laser light
  • Fig. 6 is a schematic representation of the distortion provided by the lens system shown in Fig. 5;
  • Figure 7 shows a second, particularly preferredWhensbei ⁇ play of the lens system according to the invention for a laser projection system with three laser wavelengths.
  • FIG. 8 A schematic representation of the distortion provided by the lens system shown in FIG. 7.
  • the laser light ⁇ bundle used for the formation of the image is deflected by moving mirrors.
  • the image content is displayed on the screen in that the laser power is modulated by the image information corresponding to the current spot position.
  • the mirror is usually harmonic Vibrations offset.
  • the vibration used most frequently is a sine wave, which causes a movement of the spot on the screen, which can be expressed mathematically ⁇ table (such calculations are for a sinusoidal oscillation in a similar manner mög ⁇ Lich).
  • ⁇ ⁇ m ⁇ n ⁇ t (1) causes an angular velocity of the mirror of
  • Fig. 1 shows such an attenuated laser output signal for an image constant brightness, the Ablenkspie- gel vibrations in two directions executes each with a different period, and wherein the Abschcie ⁇ deviations of the laser output signal is to be seen in accordance with the Spie ⁇ gelamba.
  • Fig. 2 shows the resulting light losses as a function of the angular amplitude of the mirror oscillation for conventional dimmed laser projectors, wherein on the x-axis, the angle amplitude in ° and on the y-axis, the loss in% are. Since mirrors with Winkelamplitu ⁇ can be realized only with great difficulty to over 10 ° in the present state of the art, the minimum occurring at RESIZE ⁇ ßeren angles can hardly be achieved; the dimming losses will therefore be on the order of 60%.
  • a device in particular a lens system of at least one lens is introduced Inventions according to the scanning mirror, which provides a distortion that kom ⁇ compensated variable spot velocity due to the mirror oscillation.
  • the spot can be reached on the screen.
  • FIG. 3 schematically shows the course of the distortion for different angular amplitudes of the mirror oscillation, wherein the distortion in% and on the y axis are shown on the x-axis.
  • Axis of the angle to the optical axis of the lens is plotted in °.
  • the graphs 2, 4, 6 show in comparison the distortions for three different angular amplitudes; wherein the graph 2 shows the course of the distortion for a mirror with an angular amplitude of 10 °, graph 4 for a mirror with an angular amplitude of 15 ° and graph 6 for a mirror with an angular amplitude of 20 °.
  • information about desired and actual coordinates of the projected pixels can be stored in suitable form in a corresponding electronic device and the instantaneous deflections of the mirror can be incorporated in real time.
  • the same electronic device can then take over the compensation of a remaining color in the lens design transverse chromatic aberration; Transformations of the image usually implemented in projectors such as keystone correction, mirroring and the correction of the image flying-spot projection typical distortion ("bow”) can also be located here.
  • the electronic device can be designed to provide a difference between existing and optimum distortion for pixels outside the oscillation direction corrected by the device according to the invention.
  • the electronic device may contain pre-vomit ⁇ -assured information on the optical properties of the projection system and advantageously be Kings ⁇ nen also include real-time data for the elongation of the mirror vibration.
  • lens design itself is the one aberrationsbe- bordered spot size, ie, the waist or the Laserbün ⁇ del interpret on the screen so that it is slightly smaller than the theoretical pixel size at the desired on ⁇ solution of the projection system.
  • the depth of field of the projection is not significantly reduced in comparison with the case of a laser beam guided onto the screen without an objective lens.
  • Color cross errors can be permitted within certain limits and be compensated electronically by taking into account the information about the corresponding positional deviation on the screen during the conversion of the image information into the laser current.
  • FIG. 4 schematically shows the image regions illuminated on a projection surface, for: a generated image without device 8 according to the invention, a generated image with device 10 according to the invention, region 12 indicating the then usable rectangular region. Due to the cushion-shaped distortion, which depends on the distance from the optical axis, unusable corners 14, which have to be blanked out electronically, are produced. Despite this blanking, nevertheless, a light gain of approximately 10% compared with the prior art can be achieved with the device according to the invention.
  • cylindrical lens systems can also be used; for example, the movement of the spot for the fast axis, ie the horizontal deflection, and the nonlinearity along the other axis as in the prior art, can be compensated by dimming the laser at the edge of the image. In this case, the light losses Betra ⁇ gen half of what you would have without taking Whether ⁇ objectively accepted.
  • Fig. 5 shows an advantageous embodiment of the lens system according to the invention, which is designed for monochromatic light, ie a laser wavelength.
  • the distortion shown schematically in Fig. 6 for monochromatic laser radiation at a Wel ⁇ lenulate of 540 nm and a maximum angle of the scan mirror of 10 ° and a projection distance of 1 m.
  • the lens system is designed so that the spot size but ⁇ rations myselfe is smaller than the nominal Pi ⁇ xel suspend at VGA resolution, so that there are in the final composed image no uncertainty contributions due to a crosstalk of the pixel information.
  • Fig. 7 shows a particularly preferredandsbei ⁇ game of the lens system according to the invention for a laser projection system with three laser wavelengths that emit light in the range of 450 nm, 540 nm and 640 nm.
  • the assumed tilt angle of the scanner mirror is in the ⁇ sem illustrated embodiment 5 ° and the projection distance is again 1 m.
  • the exemplary embodiment shown here can be used, for example, for television sets.
  • the distortion provided by the lens system in FIG. 7 is shown in FIG.
  • aberration-induced spot size is smaller than the pixel size, so that no additional blurring is introduced into the projected image.
  • an apparatus and a method for compensating for at least one non-linearity which is caused by a movement of a light deflecting device, in particular by a vibration of at least one deflecting mirror in a laser projection system, wherein the device comprises a lens system with at least one lens, the one Provides distortion compensating for the non-linearities and a projection system, in particular a laser projection system, with such a device.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

L'invention concerne un dispositif et un procédé pour compenser au moins un défaut de linéarité qui est provoqué par un mouvement d'un dispositif de déviation de lumière, notamment par une oscillation d'au moins un miroir de déviation dans un système de projection à laser. Selon l'invention, le dispositif présente un système de lentilles comprenant au moins une lentille fournissant une distorsion d'image qui compense le défaut de linéarité, ainsi qu'un système de projection, notamment un système de projection à laser, équipé d'un tel dispositif.
PCT/EP2007/056576 2007-06-29 2007-06-29 Objectif pour projection à laser WO2009003510A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/EP2007/056576 WO2009003510A1 (fr) 2007-06-29 2007-06-29 Objectif pour projection à laser
TW097124119A TW200909975A (en) 2007-06-29 2008-06-27 Device and method for compensating at least one non-linearity and laser projection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/056576 WO2009003510A1 (fr) 2007-06-29 2007-06-29 Objectif pour projection à laser

Publications (1)

Publication Number Publication Date
WO2009003510A1 true WO2009003510A1 (fr) 2009-01-08

Family

ID=39148789

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/056576 WO2009003510A1 (fr) 2007-06-29 2007-06-29 Objectif pour projection à laser

Country Status (2)

Country Link
TW (1) TW200909975A (fr)
WO (1) WO2009003510A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2105791A1 (fr) * 2008-03-28 2009-09-30 Funai Electric Co., Ltd. Appareil d'affichage d'images de projection
DE102015109323A1 (de) 2015-06-11 2016-12-15 Osram Opto Semiconductors Gmbh Anordnung, System und Verfahren zum Betrieb solch einer Anordnung
US10084229B2 (en) 2009-08-25 2018-09-25 Murata Manufacturing Co., Ltd. Antenna apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI404424B (zh) * 2010-01-14 2013-08-01 Acer Inc 投影裝置及其調整投影影像之方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003032046A1 (fr) * 2001-10-05 2003-04-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. Dispositif de projection
EP1450198A2 (fr) * 2003-02-17 2004-08-25 Seiko Epson Corporation Système à balayage
DE102004027674A1 (de) * 2004-06-07 2006-01-12 Siemens Ag Verfahren zur Kompensation von Nichtlinearitäten in einem La-serprojektionssystem und Laserprojektionssystem mit Mitteln zur Kompensation von Nichtlinearitäten
US20070176084A1 (en) * 2006-01-27 2007-08-02 E-Pin Optical Industry Co., Ltd. In-line laser scanning unit with multiple light beams

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003032046A1 (fr) * 2001-10-05 2003-04-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. Dispositif de projection
EP1450198A2 (fr) * 2003-02-17 2004-08-25 Seiko Epson Corporation Système à balayage
DE102004027674A1 (de) * 2004-06-07 2006-01-12 Siemens Ag Verfahren zur Kompensation von Nichtlinearitäten in einem La-serprojektionssystem und Laserprojektionssystem mit Mitteln zur Kompensation von Nichtlinearitäten
US20070176084A1 (en) * 2006-01-27 2007-08-02 E-Pin Optical Industry Co., Ltd. In-line laser scanning unit with multiple light beams

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2105791A1 (fr) * 2008-03-28 2009-09-30 Funai Electric Co., Ltd. Appareil d'affichage d'images de projection
US7835053B2 (en) 2008-03-28 2010-11-16 Funai Electric Co., Ltd. Projection image display apparatus
US10084229B2 (en) 2009-08-25 2018-09-25 Murata Manufacturing Co., Ltd. Antenna apparatus
DE102015109323A1 (de) 2015-06-11 2016-12-15 Osram Opto Semiconductors Gmbh Anordnung, System und Verfahren zum Betrieb solch einer Anordnung

Also Published As

Publication number Publication date
TW200909975A (en) 2009-03-01

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