EP1832110A1 - Kompensation der variierenden zeilenabstandes bei projektionssystemen mit schwingspiegel - Google Patents
Kompensation der variierenden zeilenabstandes bei projektionssystemen mit schwingspiegelInfo
- Publication number
- EP1832110A1 EP1832110A1 EP05819150A EP05819150A EP1832110A1 EP 1832110 A1 EP1832110 A1 EP 1832110A1 EP 05819150 A EP05819150 A EP 05819150A EP 05819150 A EP05819150 A EP 05819150A EP 1832110 A1 EP1832110 A1 EP 1832110A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- line
- mirror
- dimension
- movement
- line spacing
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000010355 oscillation Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
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
-
- 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
- G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
- G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, 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
-
- 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
Definitions
- the invention relates to a method according to the preamble of patent claim 1.
- Such projection systems are used, for example, in mobile telephones.
- One promising design of miniature projectors is the projection of a laser beam deflected by 2D micromirrors.
- the laser beam scans the projection surface line by line, like the electron beam in a cathode ray tube.
- An image is created by modulating the image data onto the laser beam.
- the ratio of the deflection voltage to the position of the pixel on the projection surface or the screen is linear depending on the control current.
- a corresponding number of horizontal oscillations are carried out in order to meet the requirements for corresponding resolutions, for example VGA (640 pixels x 480 lines).
- the vertical movement leads to line by line display, and the horizontal movement to the pixel-by-pixel display of the individual pixels.
- the micromirror oscillates sinusoidally both vertically and horizontally.
- the distortion is caused by the sinusoidal movement of the vertical mirror axis whose velocity assumes a minimum at the reversal points, ie at the top and at the bottom.
- a drive with a triangular voltage could be selected.
- the mirror in the vertical would theoretically perform a linear movement, which would result in a constant speed of the moving mirror plate.
- the distance between the lines would thus be uniform during the vertical mirror movement and the representation distortion-free.
- oscillation modes can form due to the mirror properties, which impair the homogeneity of the projection.
- a sinusoidal voltage is preferably used to control the vertical axis, but due to the compression of the line spacing, a distortion of the image content arises.
- the invention has for its object to provide for a proj edictionshabilit of the type mentioned compensation of the distorted line spacing.
- the method according to the invention compensates the distortion of the image content generated via the line-by-line (vertically) and pixel-wise (horizontally) oscillating mirror in the direction of the line movement, by generating a constant line spacing by a corresponding drive in the direction of the pixel movement.
- FIG. 1 shows a projection concept according to the prior art
- FIG. 2 shows the compensation according to the invention for the distorted line spacings.
- the invention is based on a projection system in which a two-dimensionally oscillating micromirror writes lines, for example in a first dimension, and pixels in a second dimension.
- the basic idea of the invention is based on the fact that the frequency of the mirror movement in the second dimension, horizontal, is changed depending on the position of the mirror in the first dimension, vertically.
- such a compensation is effected by a sinusoidal frequency change of the horizontal mirror movement.
- a distorted representation according to FIG. 2-1 can be converted into a distortion-free representation according to FIGS. 2-6 by the sinusoidal change in the horizontal frequency f h in FIG. 2-2.
- the cause may be that the horizontal mirror axis is often operated in resonance and therefore the maximum deflection amplitude of the mirror axis is achieved only at a certain resonant frequency. If this area is left, the deflection amplitudes of the mirror axis decrease.
- FIGS. 2-5 a drive according to FIGS. 2-5 is selected in a development of the invention.
- the inventive method can be used in all Laserproj etechnischsakun in which the proj etechnischsstrahl is deflected via micromirrors.
- the principle is suitable for compensating the nonlinearities of vertical mirror vibrations.
- the inventive method can as
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Projection Apparatus (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004063554A DE102004063554A1 (de) | 2004-12-30 | 2004-12-30 | Kompensation der variierenden Zeilenabstandes bei Projektionssystemen mit Schwingspiegel |
PCT/EP2005/056672 WO2006072533A1 (de) | 2004-12-30 | 2005-12-12 | Kompensation der variierenden zeilenabstandes bei projektionssystemen mit schwingspiegel |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1832110A1 true EP1832110A1 (de) | 2007-09-12 |
Family
ID=35809990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05819150A Withdrawn EP1832110A1 (de) | 2004-12-30 | 2005-12-12 | Kompensation der variierenden zeilenabstandes bei projektionssystemen mit schwingspiegel |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1832110A1 (de) |
KR (1) | KR20070101290A (de) |
CN (1) | CN101095345A (de) |
DE (1) | DE102004063554A1 (de) |
WO (1) | WO2006072533A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009244330A (ja) | 2008-03-28 | 2009-10-22 | Funai Electric Co Ltd | 投射型画像表示装置 |
CN101815156B (zh) * | 2010-04-22 | 2012-06-13 | 北京世纪桑尼科技有限公司 | 二维检流计式扫描器中图像失真校正数据的生成方法 |
DE102019212446A1 (de) * | 2019-08-20 | 2021-02-25 | Robert Bosch Gmbh | Verfahren und Recheneinheit zur Ansteuerung wenigstens einer Antriebseinheit wenigstens einer Ablenkungseinheit einer Mikroscannervorrichtung |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5478997A (en) * | 1988-10-21 | 1995-12-26 | Symbol Technologies, Inc. | Symbol scanning system and method having adaptive pattern generation |
US5504316A (en) * | 1990-05-08 | 1996-04-02 | Symbol Technologies, Inc. | Laser scanning system and scanning method for reading 1-D and 2-D barcode symbols |
US6433907B1 (en) * | 1999-08-05 | 2002-08-13 | Microvision, Inc. | Scanned display with plurality of scanning assemblies |
US6654158B2 (en) * | 2001-04-20 | 2003-11-25 | Microvision, Inc. | Frequency tunable resonant scanner with auxiliary arms |
JP4620901B2 (ja) * | 2001-06-04 | 2011-01-26 | キヤノン株式会社 | 2次元光走査装置、及び該2次元光走査装置の駆動方法 |
DE10135418B4 (de) * | 2001-07-20 | 2004-07-15 | Jenoptik Ldt Gmbh | Rasterprojektion eines Bildes mit hin- und hergehender Lichtstrahlführung |
US7446822B2 (en) * | 2002-05-15 | 2008-11-04 | Symbol Technologies, Inc. | High-resolution image projection |
KR100939017B1 (ko) * | 2002-05-17 | 2010-01-26 | 마이크로비젼, 인코퍼레이티드 | 한 디멘션에서 이미지 빔을 스윕하고 다른 디멘션에서이미지 빔을 양방향으로 스윕하는 장치 및 방법 |
-
2004
- 2004-12-30 DE DE102004063554A patent/DE102004063554A1/de not_active Withdrawn
-
2005
- 2005-12-12 CN CNA2005800456776A patent/CN101095345A/zh active Pending
- 2005-12-12 EP EP05819150A patent/EP1832110A1/de not_active Withdrawn
- 2005-12-12 KR KR1020077017236A patent/KR20070101290A/ko not_active Application Discontinuation
- 2005-12-12 WO PCT/EP2005/056672 patent/WO2006072533A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2006072533A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2006072533A1 (de) | 2006-07-13 |
CN101095345A (zh) | 2007-12-26 |
KR20070101290A (ko) | 2007-10-16 |
DE102004063554A1 (de) | 2006-07-13 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20070709 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
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19U | Interruption of proceedings before grant |
Effective date: 20070730 |
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19W | Proceedings resumed before grant after interruption of proceedings |
Effective date: 20071130 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: PALM, INC. |
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17Q | First examination report despatched |
Effective date: 20090217 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20100701 |