JPH01229293A - Display device - Google Patents

Display device

Info

Publication number
JPH01229293A
JPH01229293A JP5513388A JP5513388A JPH01229293A JP H01229293 A JPH01229293 A JP H01229293A JP 5513388 A JP5513388 A JP 5513388A JP 5513388 A JP5513388 A JP 5513388A JP H01229293 A JPH01229293 A JP H01229293A
Authority
JP
Japan
Prior art keywords
signal
deflecting
yd
held
coincidence
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
JP5513388A
Inventor
Ryusaburo Usui
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 JP5513388A priority Critical patent/JPH01229293A/en
Publication of JPH01229293A publication Critical patent/JPH01229293A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent the phosphor of a CRT from burning by monitoring variations of digital X-deflecting and Y-deflecting signals at all times and performing control so that an analog signal is not outputted unless they vary for longer than a constant time.
CONSTITUTION: The digital X-deflecting signal XD and Y-deflecting signal YD are held by a register 6 with a constant-period clock respectively. A comparing circuit 7 compares the signals XD and YD which are held by the register 56 with signals XD and YD which are not held and outputs a coincidence signal when they coincide with each other. Said coincidence and a brightness signal are ANDed by an AND gate 8 and a time counting circuit 9 counts the continuance of the ANDed coincidence signal; when the continuance is longer than the certain time, a control signal R for inhibiting the brightness signal ZA from being outputted is generated to prevent the phosphor of the CRT 3 from burning.
COPYRIGHT: (C)1989,JPO&Japio
JP5513388A 1988-03-09 1988-03-09 Display device Pending JPH01229293A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5513388A JPH01229293A (en) 1988-03-09 1988-03-09 Display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5513388A JPH01229293A (en) 1988-03-09 1988-03-09 Display device

Publications (1)

Publication Number Publication Date
JPH01229293A true JPH01229293A (en) 1989-09-12

Family

ID=12990282

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5513388A Pending JPH01229293A (en) 1988-03-09 1988-03-09 Display device

Country Status (1)

Country Link
JP (1) JPH01229293A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105355161A (en) * 2015-12-05 2016-02-24 中国航空工业集团公司洛阳电光设备研究所 Head up display bright spot ablation prevention protection method and protection apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105355161A (en) * 2015-12-05 2016-02-24 中国航空工业集团公司洛阳电光设备研究所 Head up display bright spot ablation prevention protection method and protection apparatus
CN105355161B (en) * 2015-12-05 2018-06-15 中国航空工业集团公司洛阳电光设备研究所 A kind of anti-bright spot ablation guard method of head-up display and protective device

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