JPS5461885A - Lighting control circuit - Google Patents

Lighting control circuit

Info

Publication number
JPS5461885A
JPS5461885A JP12914577A JP12914577A JPS5461885A JP S5461885 A JPS5461885 A JP S5461885A JP 12914577 A JP12914577 A JP 12914577A JP 12914577 A JP12914577 A JP 12914577A JP S5461885 A JPS5461885 A JP S5461885A
Authority
JP
Japan
Prior art keywords
transistor
light emitting
constitution
emitting diodes
light
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
JP12914577A
Other languages
Japanese (ja)
Inventor
Hisatsugu Ito
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP12914577A priority Critical patent/JPS5461885A/en
Publication of JPS5461885A publication Critical patent/JPS5461885A/en
Pending legal-status Critical Current

Links

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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • 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]

Landscapes

  • Led Devices (AREA)

Abstract

PURPOSE:To light a plurality of light emitting diodes with a simple circuit constitution by controlling a series circuit consisting of a plurality of light emitting diodes and level shift diode with a signal source through a comparator. CONSTITUTION:A signal source 1 is connected to a comparator 21 for comparison with a reference signal and the output thereof is applied to the base of a transistor 23. Next, the light emitting diodes 3, 4 to be selectively lighted and a level shift diode 200 are series-connected between the collector and emitter of this transistor 23 and a d.c. voltage of a power source 29 is applied via current limiting resistance 27 between the point of connection of the diodes 3 and 4 and the emitter of the transistor 23. If with such constitution the transistor 23 is turned ON by the signal of the signal source 1 while a voltage is being applied to the circuuit, then the light emitting diode 3 lights and 4 does not light and if the transistor 23 is turned OFF, the above become opposite and only the light emitting diode 4 lights.
JP12914577A 1977-10-26 1977-10-26 Lighting control circuit Pending JPS5461885A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12914577A JPS5461885A (en) 1977-10-26 1977-10-26 Lighting control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12914577A JPS5461885A (en) 1977-10-26 1977-10-26 Lighting control circuit

Publications (1)

Publication Number Publication Date
JPS5461885A true JPS5461885A (en) 1979-05-18

Family

ID=15002230

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12914577A Pending JPS5461885A (en) 1977-10-26 1977-10-26 Lighting control circuit

Country Status (1)

Country Link
JP (1) JPS5461885A (en)

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