JPH0576792B2 - - Google Patents

Info

Publication number
JPH0576792B2
JPH0576792B2 JP5573384A JP5573384A JPH0576792B2 JP H0576792 B2 JPH0576792 B2 JP H0576792B2 JP 5573384 A JP5573384 A JP 5573384A JP 5573384 A JP5573384 A JP 5573384A JP H0576792 B2 JPH0576792 B2 JP H0576792B2
Authority
JP
Grant status
Grant
Patent type
Prior art keywords
voltage
current
led3
circuit
output
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.)
Expired - Lifetime
Application number
JP5573384A
Other versions
JPS60198872A (en )
Inventor
Masaharu Ozaki
Original Assignee
Seiko Instr & Electronics
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
Grant date

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B33/00Electroluminescent light sources
    • H05B33/02Details
    • H05B33/08Circuit arrangements not adapted to a particular application
    • H05B33/0803Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials
    • H05B33/0806Structural details of the circuit
    • H05B33/0809Structural details of the circuit in the conversion stage
    • H05B33/0812Structural details of the circuit in the conversion stage with a controlled linear regulator
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B33/00Electroluminescent light sources
    • H05B33/02Details
    • H05B33/08Circuit arrangements not adapted to a particular application
    • H05B33/0803Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials
    • H05B33/0842Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials with control
    • H05B33/0845Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials with control of the light intensity
    • H05B33/0854Circuit arrangements not adapted to a particular application for light emitting diodes [LEDs] comprising only inorganic semiconductor materials with control of the light intensity involving load external environment sensing means

Abstract

PURPOSE:To prevent the titled circuit from being affected by the fluctuation of supply voltage and the change of an ambient temperature by a method wherein the circuit is provided with a detecting element connected in series with an LED, a reference voltage output circuit and a current limiting element driving circuit and the LED is driven in constant current. CONSTITUTION:The driving current of an LED3, which has been limited by an MOS transistor (TR)4, runs through a resistor 5 and detecting voltage V1 generates on both ends of the resistor 5. On the other hand, drain current ID to run on an MOSTR7 fluctuates according to a temperature change without being affected by the terminal voltage V0 of a DC power source 2. Voltage Vr, whose current generates on both ends of a resistor 8, is impressed on a voltage comparator 6. Accordingly, output voltage, which corresponds to the component of a difference between the voltage V1 and the voltage Vr, is outputted from the output of the comparator 6 and the conductivity of the TR4 is controlled by this output voltage. As a result, current, which corresponds to the level of the voltage Vr, runs on the LED3 through the TR4 and the LED3 is driven in constant current. Accordingly, the LED3 is driven in constant current despite the fluctuation of the voltage V0 and when the ambient temperature changes, the change of the luminous efficiency is corrected.
JP5573384A 1984-03-23 1984-03-23 Expired - Lifetime JPH0576792B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5573384A JPH0576792B2 (en) 1984-03-23 1984-03-23

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5573384A JPH0576792B2 (en) 1984-03-23 1984-03-23

Publications (2)

Publication Number Publication Date
JPS60198872A true JPS60198872A (en) 1985-10-08
JPH0576792B2 true JPH0576792B2 (en) 1993-10-25

Family

ID=13007055

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5573384A Expired - Lifetime JPH0576792B2 (en) 1984-03-23 1984-03-23

Country Status (1)

Country Link
JP (1) JPH0576792B2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988007729A1 (en) * 1987-04-01 1988-10-06 Eastman Kodak Company Printer apparatus
JPH078213Y2 (en) * 1987-09-22 1995-03-01 三洋電機株式会社 Led printer head
JPS6450948U (en) * 1987-09-24 1989-03-29
JP2539508B2 (en) * 1989-02-13 1996-10-02 日立電線株式会社 The optical recording head
JPH04348964A (en) * 1991-05-27 1992-12-03 Kyocera Corp Image forming device
JP3887826B2 (en) 1997-03-12 2007-02-28 セイコーエプソン株式会社 Display device and electronic equipment
US6697057B2 (en) 2000-10-27 2004-02-24 Semiconductor Energy Laboratory Co., Ltd. Display device and method of driving the same
WO2004019310A3 (en) * 2002-08-21 2004-04-22 Koninkl Philips Electronics Nv Display device
CN101976668B (en) * 2010-09-27 2012-11-28 复旦大学 Device for controlling light-emitting diode (LED) by silicon-based MOS tube, array and manufacturing method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5229084B2 (en) * 1972-04-06 1977-07-30
JPS551147A (en) * 1978-06-19 1980-01-07 Nec Corp Stabilized luminous source

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5229084U (en) * 1975-08-20 1977-03-01

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5229084B2 (en) * 1972-04-06 1977-07-30
JPS551147A (en) * 1978-06-19 1980-01-07 Nec Corp Stabilized luminous source

Also Published As

Publication number Publication date Type
JPS60198872A (en) 1985-10-08 application
JP1869095C (en) grant

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term