Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1986-01-21
1987-03-10
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315370, 315411, H01J 2952
Patent
active
046493255
ABSTRACT:
A scanning CRT control system is disclosed in which horizontal sync pulses are used to develop a pulse signal that provides an input to a transformer circuit also receiving a relatively low DC power supply input signal. The transformer circuit develops a very high DC voltage connected to a CRT screen while also providing a relatively lower voltage power supply signal that is utilized to develop the power supply signal provided to a video driver that controls beam excitation for the CRT. A compensation circuit is provided between the transformer circuit and a power supply terminal of the video driver such that a compensating signal is provided at the transformer circuit in accordance with each horizontal video scan line. The compensating signal has a frequency corresponding to the horizontal sweep frequency and a magnitude that varies in accordance with the average current loading of each individual horizontal scan line. In this manner the compensating signal will cause a variation in horizontal beam positioning so as to maintain horizontal orientation between different sequential horizontal scan lines regardless of the average beam current intensity of each of the horizontal scan lines. Preferably, the compensation circuit comprises a parallel resistor and capacitor connected in series between an output terminal of the transformer and the power supply terminal of the video driver.
REFERENCES:
patent: 3816793 (1974-06-01), Radloff et al.
patent: 3898523 (1975-08-01), Wessel
patent: 3912972 (1975-10-01), Otten et al.
patent: 3949269 (1976-04-01), Wheeler
patent: 3980822 (1976-09-01), Suzuki et al.
patent: 4153862 (1979-05-01), Lim
patent: 4184104 (1980-01-01), Shouse, Jr.
patent: 4234827 (1980-11-01), Willis
patent: 4503367 (1985-03-01), Wedam et al.
Motorola Schematic Diagram No. 63D25575A48.
Guerin Thomas R.
Lester Theodore V.
Blum Theodore M.
Melamed Phillip H.
Motorola Inc.
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