Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1993-09-03
1994-10-25
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315397, H01J 2970, H01J 2976
Patent
active
053592670
ABSTRACT:
A differential amplifier formed by a pair of transistors couples a vertical sawtooth signal to an input side of a vertical deflection amplifier. Nonlinearity of the transistor pair provides S-correction in the vertical direction. The current in the transistor pair varies when vertical height is adjusted, in service operation, so that the nonlinearity changes. In a vertical shrink mode of operation, the amplitude of the sawtooth signal is reduced. The nonlinearity associated with a given level of the sawtooth signal that corresponds to a given vertical position in the vertical shrink mode is the same as that associated with the same level of the sawtooth signal in the vertical, non-shrink mode.
REFERENCES:
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patent: 4176300 (1979-11-01), Waehner
patent: 4394690 (1983-07-01), Kobayashi
patent: 4692670 (1987-09-01), Imaizumi
patent: 4739228 (1988-04-01), Viscardi et al.
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patent: 5229692 (1993-07-01), Wilber
An article entitled A New Video Processor For Color TV in the names of Yamamoto et al., dated 1988 and published by IEEE.
Appln. Ser. No. 911,421, filed Jul. 10, 1992 in the names of Wilber et al., entitled Vertical Deflection Arrangement for Zoom and Pan Features.
Appln. Ser. No. 911,683, filed Jul. 10, 1992 in the name of Wilber and entitled Picture Height Adjustment Arrangement for a Video Display.
Appln. Ser. No. 911,605, filed Jul. 10, 1992 in the name of Wilber and entitled Vertical Deflection Circuit for Zoom Mode Operation.
Data Sheet, TDA9151 Programmable deflection controller, Philips Semiconductors, Dec. 1991.
Appln. filed Jul. 14, 1993 in the name of Wilber and entitled A Vertical Deflection S-Correction with Picture Height Compensation.
Blum Theodore M.
Henig Sammy S.
Laks Joseph J.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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