WO2009023480A4 - Method to reduce rf noise generation and required laser output in raster scan portable projectors - Google Patents

Method to reduce rf noise generation and required laser output in raster scan portable projectors Download PDF

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Publication number
WO2009023480A4
WO2009023480A4 PCT/US2008/072237 US2008072237W WO2009023480A4 WO 2009023480 A4 WO2009023480 A4 WO 2009023480A4 US 2008072237 W US2008072237 W US 2008072237W WO 2009023480 A4 WO2009023480 A4 WO 2009023480A4
Authority
WO
WIPO (PCT)
Prior art keywords
waveform
scan
laser beam
projection surface
stimulus
Prior art date
Application number
PCT/US2008/072237
Other languages
French (fr)
Other versions
WO2009023480A1 (en
Inventor
Lawrence E Lach
Ion V Nicolaescu
Original Assignee
Motorola Inc
Lawrence E Lach
Ion V Nicolaescu
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 Motorola Inc, Lawrence E Lach, Ion V Nicolaescu filed Critical Motorola Inc
Publication of WO2009023480A1 publication Critical patent/WO2009023480A1/en
Publication of WO2009023480A4 publication Critical patent/WO2009023480A4/en

Links

Classifications

    • 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
    • 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
    • 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
    • H04N9/3173—Constructional details thereof wherein the projection device is specially adapted for enhanced portability

Landscapes

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

Abstract

A method and apparatus that projects a two-dimensional image is disclosed. The method may include emitting a laser beam, sweeping the laser beam with a first scan mirror along a first scan direction to form a scan line on the projection surface, and sweeping the scan line with a second scan mirror along a second scan direction generally orthogonal to the first scan direction to form a raster pattern of scan lines on the projection surface. The scanner for the first scan mirror is driven with a stimulus waveform, wherein the stimulus waveform has a fundamental frequency that is substantially equal to the resonance frequency of the scanner but also contains harmonics to achieve a nearly constant velocity of the laser beam spot during its scan across the projection surface. The stimulus thereby reduces peak laser output power and corresponding noise generation while maintaining image brightness and image quality.

Claims

AMENDED CLAIMS received by the International Bureau on 09 February 2009 (09.02.2009)
1. A method for projecting a two-dimensional image, the method comprising: emitting at least one laser beam; sweeping the laser beam with a first scan mirror along a first scan direction to form a scan line on the projection surface, and sweeping the scan line with a second scan mirror along a second scan direction generally orthogonal to the first scan direction to form a raster pattern of scan lines on the projection surface; driving the scanning means of the first scan mirror with a stimulus waveform, wherein the stimulus waveform has a fundamental frequency that is substantially equal to the resonance frequency of the first scanning means and contains harmonics of that resonance frequency to produce a substantially constant velocity of the swept laser beam on the projection surface along the first scanning direction; and causing selected pixels to be illuminated, and rendered visible, by the laser beam to produce the image; wherein the stimulus waveform is a combination of a first waveform and a second waveform and the second waveform is a pulse waveform.
2. The method of claim 1 , the method further comprising: emitting respective laser beams of different wavelengths, and co-linearly arranging all of the laser beams into a composite beam directed at the first scan mirror.
3. The method of claim 1 , wherein the first waveform is a triangular waveform.
4. An apparatus for projecting a two-dimensional image, the apparatus comprising: a laser for emitting a laser beam; a first scan mirror for sweeping the laser beam along a first scan direction to form a scan line on the projection surface, and a second scan mirror for sweeping a scan line with along a second scan direction generally orthogonal to the first scan direction to form a raster pattern of scan lines on the projection surface; a driving circuit for driving a transducer attached to the first scan mirror with a stimulus waveform including harmonics, wherein the stimulus waveform has a fundamental frequency that is substantially equal to the resonance frequency of the transducer, and a controller for causing selected pixels to be illuminated, and rendered visible, by the laser beam to produce the image. wherein the stimulus waveform is a combination of a first waveform and a second waveform and the second waveform is a pulse waveform.
5. The apparatus of claim 4, the apparatus further comprising: additional lasers for emitting respective laser beams of different wavelengths, and co-linearly arranging all of the laser beams into a composite beam directed at the first scan mirror.
6. The apparatus of claim 4, wherein the first waveform is a triangular waveform.
7. An electronic device for projecting a two-dimensional image, the apparatus comprising: a laser for emitting a laser beam; a first scan mirror for sweeping the laser beam along a first scan direction to form a scan line on the projection surface, and a second scan mirror for sweeping a scan line with along a second scan direction generally orthogonal to the first scan direction to form a raster pattern of scan lines on the projection surface; a driving circuit for driving a transducer attached to the first scan mirror with a stimulus waveform including harmonics, wherein the stimulus waveform has a fundamental frequency that is substantially equal to the resonance frequency of the transducer, and a controller for causing selected pixels to be illuminated, and rendered visible, by the laser beam to produce the image; wherein the stimulus waveform is a combination of a first waveform and a second waveform and the second waveform is a pulse waveform.
8. The apparatus of claim 7, the apparatus further comprising: additional lasers for emitting respective laser beams of different wavelengths, and co-linearly arranging all of the laser beams into a composite beam directed at the first scan mirror.
9. The apparatus of claim 7, wherein the first waveform is a triangular waveform.
21
PCT/US2008/072237 2007-08-15 2008-08-05 Method to reduce rf noise generation and required laser output in raster scan portable projectors WO2009023480A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/839,244 US7729028B2 (en) 2007-08-15 2007-08-15 Method to reduce RF noise generation and required peak laser output in raster scan portable projectors
US11/839,244 2007-08-15

Publications (2)

Publication Number Publication Date
WO2009023480A1 WO2009023480A1 (en) 2009-02-19
WO2009023480A4 true WO2009023480A4 (en) 2009-04-09

Family

ID=40351067

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/072237 WO2009023480A1 (en) 2007-08-15 2008-08-05 Method to reduce rf noise generation and required laser output in raster scan portable projectors

Country Status (2)

Country Link
US (1) US7729028B2 (en)
WO (1) WO2009023480A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100949971B1 (en) * 2008-07-21 2010-03-29 엘지전자 주식회사 Apparatus and method for driving light scanner
CN101896851B (en) * 2008-10-17 2012-11-14 松下电器产业株式会社 Ing image display device
US9071771B1 (en) * 2012-07-10 2015-06-30 Rawles Llc Raster reordering in laser projection systems
JP5907031B2 (en) * 2012-09-28 2016-04-20 ソニー株式会社 Projection apparatus, projection method, program, and electronic apparatus

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5032924A (en) 1989-04-10 1991-07-16 Nilford Laboratories, Inc. System for producing an image from a sequence of pixels
US6832724B2 (en) 1993-03-26 2004-12-21 Symbol Technologies, Inc. Electro-optical assembly for image projection, especially in portable instruments
US6655597B1 (en) 2000-06-27 2003-12-02 Symbol Technologies, Inc. Portable instrument for electro-optically reading indicia and for projecting a bit-mapped color image
US5889269A (en) 1997-01-27 1999-03-30 Symbol Technologies, Inc. Linearization of raster patterns in 2D optical scanners
US6525310B2 (en) 1999-08-05 2003-02-25 Microvision, Inc. Frequency tunable resonant scanner
US7061450B2 (en) 2001-04-09 2006-06-13 Microvision, Inc. Electronically scanned beam display
US7042613B2 (en) 2003-08-12 2006-05-09 Terraop Ltd. Bouncing mode operated scanning micro-mirror
US20050140930A1 (en) 2003-12-31 2005-06-30 Symbol Technologies, Inc. Color laser projection display
KR100832622B1 (en) 2005-05-25 2008-05-27 삼성전기주식회사 Optical modulator and mobile unit using the projector of optical modulator
US7474165B2 (en) * 2005-11-22 2009-01-06 Canon Kabushiki Kaisha Oscillating device, optical deflector and optical instrument using the same
US7405384B2 (en) 2005-12-19 2008-07-29 Motorola, Inc. Method and apparatus for intensity control of multiple light sources using source timing

Also Published As

Publication number Publication date
US20090046259A1 (en) 2009-02-19
US7729028B2 (en) 2010-06-01
WO2009023480A1 (en) 2009-02-19

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