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JPS5597774A - Cathode-ray tube display unit - Google Patents

Cathode-ray tube display unit

Info

Publication number
JPS5597774A
JPS5597774A JP591879A JP591879A JPS5597774A JP S5597774 A JPS5597774 A JP S5597774A JP 591879 A JP591879 A JP 591879A JP 591879 A JP591879 A JP 591879A JP S5597774 A JPS5597774 A JP S5597774A
Authority
JP
Japan
Prior art keywords
circuit
signal
synchronizing signal
vertical synchronizing
inputted
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
JP591879A
Other languages
Japanese (ja)
Inventor
Akira Takakoshi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP591879A priority Critical patent/JPS5597774A/en
Publication of JPS5597774A publication Critical patent/JPS5597774A/en
Pending legal-status Critical Current

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  • Details Of Television Scanning (AREA)

Abstract

PURPOSE: To prevent the spot burning of CRT by detecting a synchronizing signal being cutoff and then by stopping or suppressing an electron beam by this detection signal.
CONSTITUTION: A horizontal synchronizing signal and vertical synchronizing signal are inputted to terminals 1 and 7 respectively. Once applied with an input signal, multivibrators 2 and 8 generate outputs of constant pulse width synchronizing with the input. This pulse width is set longer than signal synchronism determined by the time constant of resistance 3 and capacitor 4 or resistance 9 and capacitor 10. Those output signals are AND-ed by AND circuit 13 to exercise switching control over NAND circuit 14. A video signal from terminal 15 is inverted and amplified by circuit 14 and then led out to lead line 20. Once the vertical synchronizing signal is cut off, vibrator 8 and circuit 13 generate outputs of "0" to close circuit 14, and a collector-applied voltage appearing at line 20 as it is applied to a CRT display circuit to stop the beam. Even when neither horizontal nor vertical synchronizing signal is inputted, circuit 13 generates an output of "0" to bring similar operation to effect.
COPYRIGHT: (C)1980,JPO&Japio
JP591879A 1979-01-20 1979-01-20 Cathode-ray tube display unit Pending JPS5597774A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP591879A JPS5597774A (en) 1979-01-20 1979-01-20 Cathode-ray tube display unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP591879A JPS5597774A (en) 1979-01-20 1979-01-20 Cathode-ray tube display unit

Publications (1)

Publication Number Publication Date
JPS5597774A true JPS5597774A (en) 1980-07-25

Family

ID=11624264

Family Applications (1)

Application Number Title Priority Date Filing Date
JP591879A Pending JPS5597774A (en) 1979-01-20 1979-01-20 Cathode-ray tube display unit

Country Status (1)

Country Link
JP (1) JPS5597774A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01172094U (en) * 1988-05-23 1989-12-06
DE19609520A1 (en) * 1995-03-11 1996-09-19 Lg Electronics Inc Vertical deflection integrated circuit protection device e.g. for monitor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01172094U (en) * 1988-05-23 1989-12-06
DE19609520A1 (en) * 1995-03-11 1996-09-19 Lg Electronics Inc Vertical deflection integrated circuit protection device e.g. for monitor
DE19609520C2 (en) * 1995-03-11 1998-05-20 Lg Electronics Inc Protection device for an integrated vertical monitor deflection circuit
DE19609520C3 (en) * 1995-03-11 2002-07-04 Lg Electronics Inc Protection device for an integrated vertical monitor deflection circuit

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