Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1996-05-29
1999-06-29
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
348637, G09G 104, H04N 324
Patent
active
059172924
ABSTRACT:
Disclosed is an image display screen controller for the control of a cathode-ray tube. There is produced a blanking logic signal that begins on a leading edge of the frame synchronization square-wave pulse and ends only on the trailing edge of the VFBACK signal generated from the frame flyback pulse without getting interrupted if the frame synchronization pulse and the pulse VFBACK corresponding to the frame flyback do not overlap. An RS flip-flop circuit is activated on the leading edge of the frame synchronization square-wave pulse VSYNC and is reset only by the trailing edge of the frame flyback pulse VFBACK. The output of the RS flip-flop is applied to an input of an OR gate that receives other inputs, notably the synchronization square-wave pulses and the line and frame flyback pulses. If the scanning disappears for example by the destruction of a transistor, the absence of a frame flyback pulse will prevent the reactivation of the beam and hence prevent a dot of the screen from being burned out.
REFERENCES:
patent: 4228464 (1980-10-01), Duijkers
patent: 4652920 (1987-03-01), Dietz
French Search Report from French Patent Application 95 06495, filed May 31, 1995.
Database WPI, Week 8925 Derwent Publications Ltd., London, GB; AN 89-184692 & SU-A-1 427 597 (Minsk Gorizont Asso) Sep. 30, 1988.
Patent Abstracts of Japan, vol. 017, No. 444 (E-1415), Aug. 16, 1993 & JP-A-05 095493 (Matsushita Electric Ind. Co. Ltd.).
Patent Abstracts of Japan, vol. 012, No. 094 (E-593), Mar. 26, 1988 & JP-A-62 225077 (Kaga Denshi KK).
Patent Abstracts of Japan, vol. 006, No. 140 (E-121), Jul. 29, 1982 & JP-A-57 065067 (Hitachi Ltd.).
Issing Gregory C.
SGS-Thomson Microelectronics S.A.
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