JPS6464267A - Led driving circuit - Google Patents

Led driving circuit

Info

Publication number
JPS6464267A
JPS6464267A JP21916687A JP21916687A JPS6464267A JP S6464267 A JPS6464267 A JP S6464267A JP 21916687 A JP21916687 A JP 21916687A JP 21916687 A JP21916687 A JP 21916687A JP S6464267 A JPS6464267 A JP S6464267A
Authority
JP
Japan
Prior art keywords
led
current
connection point
stray capacitance
rapidly
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.)
Pending
Application number
JP21916687A
Other languages
Japanese (ja)
Inventor
Masaaki Yusa
Junji Funatsu
Kenichi Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP21916687A priority Critical patent/JPS6464267A/en
Publication of JPS6464267A publication Critical patent/JPS6464267A/en
Pending legal-status Critical Current

Links

Landscapes

  • Led Devices (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To perform the high speed switching of an LED, by outputting the differential current of an input signal, to a connection point between a light emitting diode (LED) and a constant current source, and making the current charge a stray capacitance. CONSTITUTION:When the voltage VIN of input signal turns to the low level, a transistor 4 turns to an OFF-state, and a differential current ip on the plus side is output from a differentiation circuit 7. As a result, the driving current (i) for an LED 1 and a stray capacitance 6 becomes the sum of a constant current I and the differential current ip. The stray capacitance 6 is charged by this current, and the electric potential VS of a connection point A increases. As a result, the electric potential VS of the connection point A rapidly exceeds the threshold voltage VTH of the LED 1, and reaches a final value. Therefore, all of the constant current I rapidly flows through the LED 1, and its light emitting intensity, too, reaches rapidly the maximum value.
JP21916687A 1987-09-03 1987-09-03 Led driving circuit Pending JPS6464267A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21916687A JPS6464267A (en) 1987-09-03 1987-09-03 Led driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21916687A JPS6464267A (en) 1987-09-03 1987-09-03 Led driving circuit

Publications (1)

Publication Number Publication Date
JPS6464267A true JPS6464267A (en) 1989-03-10

Family

ID=16731236

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21916687A Pending JPS6464267A (en) 1987-09-03 1987-09-03 Led driving circuit

Country Status (1)

Country Link
JP (1) JPS6464267A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04175009A (en) * 1990-07-03 1992-06-23 Fuji Electric Co Ltd Photoelectric switch
US5140175A (en) * 1989-06-24 1992-08-18 Mitsubishi Rayon Co., Ltd. Light-emitting diode drive circuit with fast rise time and fall time
JP2008235349A (en) * 2007-03-16 2008-10-02 Sony Corp LIGHT EMITTING ELEMENT, ITS DRIVING METHOD, AND IMAGE DISPLAY DEVICE
JP2012240319A (en) * 2011-05-20 2012-12-10 Ricoh Co Ltd Light source drive device and image forming apparatus
JP2013517740A (en) * 2010-01-19 2013-05-16 ジョンソン コントロールズ テクノロジー カンパニー Optocoupler circuit for gate driver

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5140175A (en) * 1989-06-24 1992-08-18 Mitsubishi Rayon Co., Ltd. Light-emitting diode drive circuit with fast rise time and fall time
JPH04175009A (en) * 1990-07-03 1992-06-23 Fuji Electric Co Ltd Photoelectric switch
JP2008235349A (en) * 2007-03-16 2008-10-02 Sony Corp LIGHT EMITTING ELEMENT, ITS DRIVING METHOD, AND IMAGE DISPLAY DEVICE
JP2013517740A (en) * 2010-01-19 2013-05-16 ジョンソン コントロールズ テクノロジー カンパニー Optocoupler circuit for gate driver
JP2012240319A (en) * 2011-05-20 2012-12-10 Ricoh Co Ltd Light source drive device and image forming apparatus

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