Television – Cathode-ray tube display automatic black level bias control
Patent
1997-08-06
1999-04-13
Hsia, Sherrie
Television
Cathode-ray tube display automatic black level bias control
348380, 348697, 348689, 315381, 315388, H04N 568, H04N 972
Patent
active
058943277
ABSTRACT:
Video signals to be displayed are applied via a video driver amplifier to the cathode electrode of a kinescope. A beam current sensor, also coupled to the cathode electrode, provides a beam current indicating signal. An AKB regulator, responsive to the beam current indicating signal, supplies a black level correction signal to the driver amplifier for regulating the black level of images displayed by the kinescope. A screen grid supply system is provided for controlling the G-2 (screen grid) voltage of the kinescope as a predetermined function of the black level correction signal thereby forming with the AKB regulator a dual feedback loop for providing black level regulation by both the driver amplifier and the screen grid thereby maximizing or extending the overall black level control range. Consequently, the high voltage screen control potentiometer normally required for setting screen grid bias may be completely eliminated if desired, or, in applications where it is retained, no adjustments are required subsequent to an initial adjustment.
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Emanuel Peter M.
Hsia Sherrie
Shedd Robert D.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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