TW200509751A - Low noise light source operation circuit and method - Google Patents

Low noise light source operation circuit and method

Info

Publication number
TW200509751A
TW200509751A TW092123867A TW92123867A TW200509751A TW 200509751 A TW200509751 A TW 200509751A TW 092123867 A TW092123867 A TW 092123867A TW 92123867 A TW92123867 A TW 92123867A TW 200509751 A TW200509751 A TW 200509751A
Authority
TW
Taiwan
Prior art keywords
light source
circuit
low noise
signal
duty cycle
Prior art date
Application number
TW092123867A
Other languages
Chinese (zh)
Other versions
TWI222336B (en
Inventor
Andre Yu
Original Assignee
Beyond Innovation Tech Co Ltd
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 Beyond Innovation Tech Co Ltd filed Critical Beyond Innovation Tech Co Ltd
Priority to TW092123867A priority Critical patent/TWI222336B/en
Priority to KR1020030075809A priority patent/KR20050022847A/en
Priority to JP2003375392A priority patent/JP2005079085A/en
Application granted granted Critical
Publication of TWI222336B publication Critical patent/TWI222336B/en
Publication of TW200509751A publication Critical patent/TW200509751A/en

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Optical Communication System (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Semiconductor Lasers (AREA)
  • Liquid Crystal (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

A low noise light source operation circuit and method comprises synchronous pulse width modulator, zero point signal picked circuit, light source driving circuit, light source and feedback signal picked circuit. Zero point signal picked circuit picks the zero points of light source driving circuit, and send the synchronous control signal with the output according these zero points. Synchronous pulse width modulator controls the duty cycle of the duty cycle signal according synchronous control pulse and feedback signal, and send the duty cycle signal to light source driving circuit.
TW092123867A 2003-08-29 2003-08-29 Low noise light source operation circuit and method TWI222336B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
TW092123867A TWI222336B (en) 2003-08-29 2003-08-29 Low noise light source operation circuit and method
KR1020030075809A KR20050022847A (en) 2003-08-29 2003-10-29 Low noise light source operation circuit and method thereof
JP2003375392A JP2005079085A (en) 2003-08-29 2003-11-05 Low noise light source operation circuit, and operation method of same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW092123867A TWI222336B (en) 2003-08-29 2003-08-29 Low noise light source operation circuit and method

Publications (2)

Publication Number Publication Date
TWI222336B TWI222336B (en) 2004-10-11
TW200509751A true TW200509751A (en) 2005-03-01

Family

ID=34420996

Family Applications (1)

Application Number Title Priority Date Filing Date
TW092123867A TWI222336B (en) 2003-08-29 2003-08-29 Low noise light source operation circuit and method

Country Status (3)

Country Link
JP (1) JP2005079085A (en)
KR (1) KR20050022847A (en)
TW (1) TWI222336B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102045914B (en) * 2009-10-20 2015-04-15 立锜科技股份有限公司 Lag mode LED driver with accurate average current and method
TWI548303B (en) * 2014-12-05 2016-09-01 隆達電子股份有限公司 Dimming control apparatus and dimming control method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100419521C (en) * 2005-08-04 2008-09-17 群康科技(深圳)有限公司 Liquid crystal displaying device
US9185784B2 (en) * 2008-06-02 2015-11-10 Richard Landry Gray Line synchronized electrical device and controlling method thereof
CN102360234B (en) * 2011-06-21 2013-12-11 成都芯源系统有限公司 Current control circuit and current control method
CN104010425B (en) * 2012-04-13 2016-02-03 江苏理工学院 Transformer-free power supply of light-emitting diode for illumination
CN105374323B (en) * 2015-12-18 2018-02-13 深圳Tcl数字技术有限公司 Dot matrix backlight drive method, device and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102045914B (en) * 2009-10-20 2015-04-15 立锜科技股份有限公司 Lag mode LED driver with accurate average current and method
TWI548303B (en) * 2014-12-05 2016-09-01 隆達電子股份有限公司 Dimming control apparatus and dimming control method

Also Published As

Publication number Publication date
JP2005079085A (en) 2005-03-24
TWI222336B (en) 2004-10-11
KR20050022847A (en) 2005-03-08

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Legal Events

Date Code Title Description
MM4A Annulment or lapse of patent due to non-payment of fees