Television – Cathode-ray tube display automatic black level bias control
Patent
1994-06-08
1996-12-31
Lee, Micheal H.
Television
Cathode-ray tube display automatic black level bias control
348380, 315381, H04N 568
Patent
active
055898831
ABSTRACT:
A cathode ray tube display in which a signal for detection of a cathode current is inserted into a part of the vertical blanking period of the video signal to be displayed, a cathode current corresponding to the signal for detection is detected, and a cathode voltage or a grid voltage is negative feedback controlled so that the detected cathode current becomes constant, thereby stabilizing the cathode current. The display has a local overscan circuit for executing a vertical scan on the screen with a width larger than a predetermined scan width only at a timing of the cathode current detecting signal inserted for a vertical blanking period, and even in the case where an underscan system to scan by a width smaller than a predetermined display screen width is used as a scan system of the screen display. The invention prevents a harmful visible display image by the cathode current detecting signal appears on the screen.
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E. Gublass, Bildrohrenansteuerung mit automatischer Dunkelstrom-Regelung, Funkschau 1979, vol. 12, pp. 675-678.
Fujikura Tsuneo
Fujiwara Takahiko
Ikeda Miyuki
Nakagiri Etsuhiro
Ogino Masanori
Hitachi , Ltd.
Lee Micheal H.
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