WO1999029142A1 - Circuit et procede de commande de diode electroluminescente - Google Patents

Circuit et procede de commande de diode electroluminescente Download PDF

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Publication number
WO1999029142A1
WO1999029142A1 PCT/KR1998/000392 KR9800392W WO9929142A1 WO 1999029142 A1 WO1999029142 A1 WO 1999029142A1 KR 9800392 W KR9800392 W KR 9800392W WO 9929142 A1 WO9929142 A1 WO 9929142A1
Authority
WO
WIPO (PCT)
Prior art keywords
light emitting
emitting diode
soft
time
current
Prior art date
Application number
PCT/KR1998/000392
Other languages
English (en)
Inventor
Sung Pyo Hong
Original Assignee
Daysun Electronics 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 Daysun Electronics Co., Ltd. filed Critical Daysun Electronics Co., Ltd.
Publication of WO1999029142A1 publication Critical patent/WO1999029142A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • 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
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to a circuit and method for driving a light emitting diode, and in particular, to a circuit and method for driving a light emitting diode, which drives a light emitting diode to gently grow light or become dark when it is turned on or off, enabling visually easy tuning on/off of the light emitting diode.
  • the light emitting diode is turned on/off according to on/off switching method so that it lights up to the maximum luminance instantly it is switched on, and it is turned off instantly it is switched off. Accordingly, though the light emitting diode satisfactorily serves for the indicator, when it is used as a night warning light in the open air, it tires driver's eye due to its instantaneous turning on/off. This problem become severe when several tens of light emitting diodes are simultaneously turned on/off or a high-luminance light emitting diode is employed in order to improve the indication function of warning light by increasing its luminance which is lower than lamps .
  • An object of the present invention is to provide a circuit and method for driving a light emitting diode, which drives a light emitting diode to gradually brighten up when it is turned on and gradually become dark when turned off.
  • Figs. 4A to 4E are timing diagrams showing the timing relationship between output signals of sections constructing the driving circuit of Fig. 3;
  • Figs. 5, 6, 7 and 8 are flow diagrams for explaining a method of driving a light emitting diode according to a preferred embodiment of the present invention;
  • Fig. 9 is a timing diagram showing the relationship between the pulse waveform of a soft on- time driving signal and luminance of a light emitting diode;
  • Fig. 11 is a diagram showing the relationship between the pulse waveform of an on-time driving signal and luminance of a light emitting diode; and Figs. 12 and 13 are flow diagrams for explaining a method of driving a light emitting diode according to another embodiment of the present invention.
  • Fig. 2 is a waveform diagram for explaining turning on/off of a light emitting diode according to the present invention.
  • the edge of a light emitting diode driving signal has a gentle slope to allow the light emitting diode to be turned on/off smoothly.
  • Fig. 3 is a block diagram of a light emitting diode driving circuit according to a preferred embodiment of the present invention
  • Figs. 4A to 4E are timing diagrams showing the timing relationship between output signals of sections constructing the driving circuit of Fig. 3.
  • the driving circuit includes a light emitting diode 10, turning-on controller 20, turning-off controller 30 and driver 40.
  • Turning-off controller 30 generates a switching driving signal (having a waveform shown in Fig. 4A) for driving a switch 50 to cut off power voltage (Vcc) supplied to turning-on controller 20 only when the light emitting diode is turned off, that is, only during the period of off-time.
  • Driver 40 includes resistors Rl, R2 and R3 for restricting current supplied from soft on-time driver 22, normal on-time driver 24 and soft off-time driver 26, a capacitor CI and transistor Ql.
  • Turning-on and turning-off controllers 20 and 30 may be configured of analog circuits, microcontroller or microprocessor.
  • step 100 is repeated to turn on the light emitting diode.
  • the light emitting diode driving circuit includes a battery 700, solar battery 710, reset circuit 720, driver 730, mode selector 740 and controller 750.
  • Battery 700 is configured of a chargeable secondary battery and charged with current which is generated from solar battery 710 and supplied through a reverse current prevention diode Dl.
  • Reset circuit 720 consists of resistors Rl, R2 and R3, capacitors CI and C2, diodes Dl and D2, transistor Ql and reset switch SW1. When the output voltage of solar battery 710, which is higher than a predetermined level, is provided to reset circuit 720, this output voltage turns on transistor Ql to apply a low level signal to the reset terminal of controller 750, allowing controller 750 to maintain reset state.
  • the voltage charged in battery 700 is provided to each of the sections constructing the driving circuit as its operation voltage.
  • the low level signal is applied to the reset terminal of controller 750, maintaining its reset state.
  • the low level signal is applied to the reset terminal of controller 750 through resistor R3 and capacitor C2 during the charging period of capacitor C2, initially resetting controller 750.
  • transistors Q2 and Q3 of driver 730 are turned off during the LOW period to cut off current provided to light emitting diode LED, thereby turning off it.
  • the value of rising time counter is decreased by one (830), and the value is checked if it is 0 (832).
  • Step 820 is repeated when the value is not 0, and the rising time routine is finished when it is. That is, in the rising time routine, the pulse width of HIGH period of every cycle is gradually increased with reference to a given sine wave curve during the period corresponding to the number of steps given as the rising time of table read by a selected control mode, to control light emitting diode LED to gently brighten up corresponding to the sine wave curve.
  • the light emitting diode gradually brightens up in soft on-mode when it is turned on, and gradually becomes dark in soft off-mode when it is turned off. This prevents the light emitting diode from becoming bright or dark instantaneously when it is turned on or off, enabling its smooth turning on/off with visual stress being removed. Therefore, it is possible to softly indicate lighting up and lighting out of light emitting diode in a device such as warning light on the road, similar to those of the filament lamp.

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  • Led Devices (AREA)

Abstract

La présente invention concerne un circuit de commande de diode électroluminescente comportant un module de commande de séquence d'allumage progressive permettant de fournir un courant d'allumage augmentant progressivement à l'allumage de la diode. Le circuit de commande comporte également un module commande de séquence d'allumage normale permettant de fournir un courant d'allumage normal dont le niveau est identique à celui du courant d'allumage progressif immédiatement après la fin de la séquence d'allumage. Le circuit de commande comporte par ailleurs un module de commande de séquence d'extinction progressive permettant de fournir un courant d'extinction diminuant progressivement depuis le niveau de tension normal immédiatement après la fin de la séquence d'allumage. Le circuit de commande comporte enfin un module de commande de diode électroluminescente permettant de commander la diode électroluminescente de façon qu'elle s'allume ou s'éteigne progressivement en fonction des courants fournis par le module de commande de séquence d'allumage progressive, par le module de commande de séquence d'allumage normal, et par le module de commande de séquence d'extinction progressive.
PCT/KR1998/000392 1997-12-03 1998-12-02 Circuit et procede de commande de diode electroluminescente WO1999029142A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1997/65632 1997-12-03
KR19970065632 1997-12-03

Publications (1)

Publication Number Publication Date
WO1999029142A1 true WO1999029142A1 (fr) 1999-06-10

Family

ID=19526349

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR1998/000392 WO1999029142A1 (fr) 1997-12-03 1998-12-02 Circuit et procede de commande de diode electroluminescente

Country Status (3)

Country Link
KR (1) KR19990062405A (fr)
CN (1) CN1290469A (fr)
WO (1) WO1999029142A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2371689B (en) * 2001-03-10 2003-07-16 Siemens Plc Electrical apparatus and method
EP1594346A2 (fr) * 2004-05-07 2005-11-09 Hella KGaA Hueck & Co. Méthode de contrôle d'un clignotant de voiture
DE102004062728B3 (de) * 2004-12-27 2006-04-06 Insta Elektro Gmbh Elektrische/elektronische Schaltungsanordnung
DE102004062727B3 (de) * 2004-12-27 2006-04-06 Insta Elektro Gmbh Elektrische/elektronische Schaltungsanordnung
EP1919263A2 (fr) * 2006-11-03 2008-05-07 Zulch Laboratories Inc. Changement d'intensité pour réduire le scintillement pour éclairage à contrôle numérique
CN100393177C (zh) * 2000-12-27 2008-06-04 皇家菲利浦电子有限公司 带有电调节色彩平衡的led光源
DE102004004319B4 (de) * 2003-01-31 2009-07-16 Anden Co., Ltd., Anjo Steuervorrichtung für eine Licht emittierende Diode
WO2009121956A1 (fr) * 2008-04-04 2009-10-08 Lemnis Lighting Patent Holding B.V. Circuit de déclenchement de gradateur, système de gradateur et dispositif à gradation réglable
EP2186681A1 (fr) * 2007-08-07 2010-05-19 Rohm Co., Ltd. Contrôleur de mise en marche/arrêt de source de lumière
US8829812B2 (en) 2008-04-04 2014-09-09 Koninklijke Philips N.V. Dimmable lighting system
GB2526882A (en) * 2014-06-06 2015-12-09 Aim Aviat Jecco Ltd Pulse width modulator for use in aviation
DE102020107047A1 (de) 2020-03-13 2021-09-16 Bayerische Motoren Werke Aktiengesellschaft Fahrtrichtungsanzeige-System

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100825099B1 (ko) * 2001-12-20 2008-04-25 삼성전자주식회사 표시 장치용 백라이트 장치
US6690146B2 (en) * 2002-06-20 2004-02-10 Fairchild Semiconductor Corporation High efficiency LED driver
KR100800568B1 (ko) * 2007-04-03 2008-02-04 나노퍼시픽(주) 전계방출 장치 및 그 구동 방법
KR100887087B1 (ko) * 2007-06-26 2009-03-04 삼성전기주식회사 극장 디밍 벅타입 ｌｅｄ 구동 장치
CN103152899B (zh) * 2011-12-06 2015-04-01 曙光信息产业股份有限公司 流水灯光实现方法和装置、以及发光设备
CN102625534B (zh) * 2012-03-20 2015-02-11 惠州Tcl移动通信有限公司 移动终端的闪光灯控制装置
KR101600913B1 (ko) * 2016-01-22 2016-03-08 주식회사 덕인 레이저 리프트 오프 장치 및 그를 이용한 레이저 리프트 오프 방법

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07312109A (ja) * 1994-05-18 1995-11-28 Takion:Kk 装飾用点滅装置
JPH09269744A (ja) * 1996-04-01 1997-10-14 Shotaro Arai 照明付広告装置とそれを用いた広告装置付郵便ポスト
JPH1074049A (ja) * 1996-08-30 1998-03-17 Matsushita Electric Works Ltd 液晶表示装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07312109A (ja) * 1994-05-18 1995-11-28 Takion:Kk 装飾用点滅装置
JPH09269744A (ja) * 1996-04-01 1997-10-14 Shotaro Arai 照明付広告装置とそれを用いた広告装置付郵便ポスト
JPH1074049A (ja) * 1996-08-30 1998-03-17 Matsushita Electric Works Ltd 液晶表示装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 96, No. 3, 1996; & JP 7312109 A (TAKION K.K.) 28 November 1995. *
PATENT ABSTRACTS OF JAPAN, Vol. 98, No. 2, 1998; & JP 9269744 A (ARAI SHOTARO) 14 October 1997. *
PATENT ABSTRACTS OF JAPAN, Vol. 98, No. 8, 1998; & JP 10074049 A (MATSUSHITA ELECTRIC WORKS LTD.) 17 March 1998. *

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100393177C (zh) * 2000-12-27 2008-06-04 皇家菲利浦电子有限公司 带有电调节色彩平衡的led光源
GB2371689B (en) * 2001-03-10 2003-07-16 Siemens Plc Electrical apparatus and method
DE102004004319B4 (de) * 2003-01-31 2009-07-16 Anden Co., Ltd., Anjo Steuervorrichtung für eine Licht emittierende Diode
DE102004004319B8 (de) * 2003-01-31 2009-11-05 Anden Co., Ltd., Anjo Steuervorrichtung für eine Licht emittierende Diode
EP1594346A2 (fr) * 2004-05-07 2005-11-09 Hella KGaA Hueck & Co. Méthode de contrôle d'un clignotant de voiture
EP1594346A3 (fr) * 2004-05-07 2008-01-02 Hella KGaA Hueck & Co. Méthode de contrôle d'un clignotant de voiture
DE102004062728B3 (de) * 2004-12-27 2006-04-06 Insta Elektro Gmbh Elektrische/elektronische Schaltungsanordnung
DE102004062727B3 (de) * 2004-12-27 2006-04-06 Insta Elektro Gmbh Elektrische/elektronische Schaltungsanordnung
EP1919263A3 (fr) * 2006-11-03 2011-05-11 Zulch Laboratories Inc. Changement d'intensité pour réduire le scintillement pour éclairage à contrôle numérique
EP1919263A2 (fr) * 2006-11-03 2008-05-07 Zulch Laboratories Inc. Changement d'intensité pour réduire le scintillement pour éclairage à contrôle numérique
US7994732B2 (en) 2006-11-03 2011-08-09 Zulch Laboratories, Inc. Intensity changing with reduced flicker for digitally-controlled lighting
EP2186681A1 (fr) * 2007-08-07 2010-05-19 Rohm Co., Ltd. Contrôleur de mise en marche/arrêt de source de lumière
EP2186681A4 (fr) * 2007-08-07 2012-11-21 Rohm Co Ltd Contrôleur de mise en marche/arrêt de source de lumière
US8400062B2 (en) 2007-08-07 2013-03-19 Rohm Co., Ltd. Light source turn-on/off controller
US8575840B2 (en) 2007-08-07 2013-11-05 Rohm Co., Ltd. Light source turn-on/off controller
WO2009121956A1 (fr) * 2008-04-04 2009-10-08 Lemnis Lighting Patent Holding B.V. Circuit de déclenchement de gradateur, système de gradateur et dispositif à gradation réglable
US8212494B2 (en) 2008-04-04 2012-07-03 Lemnis Lighting Patents Holding B.V. Dimmer triggering circuit, dimmer system and dimmable device
US8829812B2 (en) 2008-04-04 2014-09-09 Koninklijke Philips N.V. Dimmable lighting system
GB2526882A (en) * 2014-06-06 2015-12-09 Aim Aviat Jecco Ltd Pulse width modulator for use in aviation
DE102020107047A1 (de) 2020-03-13 2021-09-16 Bayerische Motoren Werke Aktiengesellschaft Fahrtrichtungsanzeige-System

Also Published As

Publication number Publication date
CN1290469A (zh) 2001-04-04
KR19990062405A (ko) 1999-07-26

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