JPS54111234A - Display driving circuit - Google Patents

Display driving circuit

Info

Publication number
JPS54111234A
JPS54111234A JP1838478A JP1838478A JPS54111234A JP S54111234 A JPS54111234 A JP S54111234A JP 1838478 A JP1838478 A JP 1838478A JP 1838478 A JP1838478 A JP 1838478A JP S54111234 A JPS54111234 A JP S54111234A
Authority
JP
Japan
Prior art keywords
digit
signals
signal
circuit
power source
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
JP1838478A
Other languages
Japanese (ja)
Inventor
Yasuo Taguchi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP1838478A priority Critical patent/JPS54111234A/en
Publication of JPS54111234A publication Critical patent/JPS54111234A/en
Pending legal-status Critical Current

Links

Landscapes

  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

PURPOSE: To prevent the generation of noise which impedes TV receivers, radios, etc., by making fixed periods after and before the switching time digit designation signals into a non-active level in the circuit where plural-digit luminous elements is subjected to dynamic display driving.
CONSTITUTION: Four-digit dynamic display driving circuit is constituted by counters 11 to 14, display control circuit 2, digit driver 3, segment driver 5, etc. In this constitution, power source control circuit 6 outputs power source control signal C which becomes 0-level during fixed periods after and before digit signals D1 to D4 generated from the display control circuit are switched to next-digit digit signals and becomes 1-level during other periods. Next, integrating circuit 7 supplies signal CI, which is obtained by making the leading edge and the trailing edge of signal C gentle, to segment driver 5. As a result, display device 4 takes signal CI as an operation power source and displays count information according to current segment signals. Further, the current change of each luminous element is relaxed by the gentle slope of signal CI at a display switching time, so that noise signals can be prevented from being generated from display device 4.
COPYRIGHT: (C)1979,JPO&Japio
JP1838478A 1978-02-20 1978-02-20 Display driving circuit Pending JPS54111234A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1838478A JPS54111234A (en) 1978-02-20 1978-02-20 Display driving circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1838478A JPS54111234A (en) 1978-02-20 1978-02-20 Display driving circuit

Publications (1)

Publication Number Publication Date
JPS54111234A true JPS54111234A (en) 1979-08-31

Family

ID=11970208

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1838478A Pending JPS54111234A (en) 1978-02-20 1978-02-20 Display driving circuit

Country Status (1)

Country Link
JP (1) JPS54111234A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59128455A (en) * 1983-01-14 1984-07-24 Rohm Co Ltd Level display apparatus
JPS59128458A (en) * 1983-01-14 1984-07-24 Rohm Co Ltd Level display apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5158023A (en) * 1974-11-18 1976-05-21 Kokusai Electric Co Ltd Hyoojisochino kidokirikaehoshiki

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5158023A (en) * 1974-11-18 1976-05-21 Kokusai Electric Co Ltd Hyoojisochino kidokirikaehoshiki

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59128455A (en) * 1983-01-14 1984-07-24 Rohm Co Ltd Level display apparatus
JPS59128458A (en) * 1983-01-14 1984-07-24 Rohm Co Ltd Level display apparatus

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