Electric lamp and discharge devices: systems – Cathode ray tube circuits
Patent
1994-09-15
1998-01-27
Pascal, Robert
Electric lamp and discharge devices: systems
Cathode ray tube circuits
315370, 331 20, 348537, H01V 2998
Patent
active
057125325
ABSTRACT:
A CRT display device capable of displaying a signal from the existing image signal source, in which a vertical frequency is approximately fixed and a horizontal frequency is widely distributed beyond a ratio of 3:1, on one image screen. The CRT display device includes a scan converter unit and a display unit. The scan converter unit includes an output horizontal frequency unifying circuit, a horizontal blanking period ratio converting circuit, a vertical frequency converting unit and a vertical blanking period ratio converting circuit. The display unit includes a vertical deflection circuit and a circuit for correcting a vertical S-shaped distortion. In a phase synchronous circuit, a lock-out detector is connected to an output of a three state output digital phase detector, and on the basis of an output thereof, a switch is subjected to the "ON"/"OFF" control. For a period of time when an output of the lock-out detector indicates a lock-out state, a loop gain of the PLL is increased and the pull-in time is shortened. For the remaining periods of time, i.e., in the steady state, the loop gain is decreased and the noise resistance characteristics are improved.
REFERENCES:
patent: 3509477 (1970-04-01), Verwey et al.
patent: 4611230 (1986-09-01), Nienaber
patent: 4884040 (1989-11-01), Fling
patent: 4931703 (1990-06-01), Ogino
patent: 5053724 (1991-10-01), Ogino et al.
patent: 5130800 (1992-07-01), Johnson et al.
patent: 5301021 (1994-04-01), Ogino et al.
"Self-Adapting CRT Horizontal Scan Circuit", IBM Technical Disclosure Bulletin, vol. 35, No. 2, Jul. 1992.
"Horizontal Scan Phase-Locked Loop Detector for CRT ", IBM Technical Disclosure Bulletin, vol. 26, No. 7a, Dec. 1983.
D. G. Fink, "Television Engineering Handbook", McGraw Hill, 1957, pp. 6-1 6-33.
Ikeda Miyuki
Imoto Yoshiyuki
Kawasaki Jiro
Naka Kazutaka
Ogino Masanori
Bettendorf Justin P.
Hitachi , Ltd.
Pascal Robert
LandOfFree
Scalable CRT display device and phase synchronous circuit for us does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Scalable CRT display device and phase synchronous circuit for us, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scalable CRT display device and phase synchronous circuit for us will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-344887