JPS562679A - Protection method for light emitting diode - Google Patents

Protection method for light emitting diode

Info

Publication number
JPS562679A
JPS562679A JP7755579A JP7755579A JPS562679A JP S562679 A JPS562679 A JP S562679A JP 7755579 A JP7755579 A JP 7755579A JP 7755579 A JP7755579 A JP 7755579A JP S562679 A JPS562679 A JP S562679A
Authority
JP
Japan
Prior art keywords
light emitting
lighting
diodes
emitting diodes
timer
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.)
Granted
Application number
JP7755579A
Other languages
Japanese (ja)
Other versions
JPS5946430B2 (en
Inventor
Masaharu Yamamoto
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP54077555A priority Critical patent/JPS5946430B2/en
Publication of JPS562679A publication Critical patent/JPS562679A/en
Publication of JPS5946430B2 publication Critical patent/JPS5946430B2/en
Expired legal-status Critical Current

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Abstract

PURPOSE: To protect light emitting diodes from damage when dynamically lighting on a plurality of light emitting diodes in a time division manner, by providing an access time interval monitor circuit to interrupt the lighting-on when the duration of a pulse current supplied to the diodes exceeds a prescribed value.
CONSTITUTION: A decoder 2 and a driver 3 are provided for a plurality of light emitting diodes 1a∼1n. The diodes are operated in a time division manner to perform dynamic lighting-on. A display unit is composed of the light emitting diodes. An access time interval monitor circuit 4 is provided to produce alarm information to stop the lighting-on when the duration of a pulse current supplied to the diodes exceeds a prescribed allowable length. The circuit 4 is made of a watchdog timer. A writing signal is applied to the timer. When a lighting-on control circuit does not perform prescribed action, the timer is operated to suppress an overcurrent by the driver 3.
COPYRIGHT: (C)1981,JPO&Japio
JP54077555A 1979-06-21 1979-06-21 Light emitting diode protection method Expired JPS5946430B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54077555A JPS5946430B2 (en) 1979-06-21 1979-06-21 Light emitting diode protection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54077555A JPS5946430B2 (en) 1979-06-21 1979-06-21 Light emitting diode protection method

Publications (2)

Publication Number Publication Date
JPS562679A true JPS562679A (en) 1981-01-12
JPS5946430B2 JPS5946430B2 (en) 1984-11-12

Family

ID=13637254

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54077555A Expired JPS5946430B2 (en) 1979-06-21 1979-06-21 Light emitting diode protection method

Country Status (1)

Country Link
JP (1) JPS5946430B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0169055U (en) * 1987-10-28 1989-05-08

Also Published As

Publication number Publication date
JPS5946430B2 (en) 1984-11-12

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