Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1995-12-22
1998-03-10
Pascal, Robert
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
348379, H01J 2952
Patent
active
057265402
ABSTRACT:
A transient improvement circuit is disclosed for cathode ray tube (CRT) amplifiers with automatic kinescope bias feedback circuits. An NPN transistor and a PNP transistor are provided, each having a collector, an emitter and a base. A video input signal is applied to the base of the NPN transistor. A first collector resistor is connected between the collector of the NPN transistor and a power supply voltage, the collector of the NPN transistor also being connected to the base of the PNP transistor. A first emitter resistor is connected between the emitter of the NPN transistor and ground, and the first emitter resistor has, connected in parallel therewith, a filter capacitor and a second emitter resistor connected in series with the filter capacitor. A third emitter resistor, having a first end and a second end, is also provided, wherein the first end is connected to the emitter of the PNP transistor and a forward-biased diode and a first capacitor are connected, in parallel, across the base of the PNP transistor and the second end of the third emitter resistor. A second collector resistor is connected between the collector of the PNP transistor and ground and an output resistor is connected to the second end of the third emitter resistor and is output to the drive a cathode. The circuit provides a CRT amplifier with symmetrical rise and fall transitions, radio frequency emissions are reduced on black-to-white edges, pre-shoot and overshoot levels are equal without signal warping in the luminance processor and gamma correction is reduced or eliminated.
REFERENCES:
patent: 4694350 (1987-09-01), Hinn
patent: 5400086 (1995-03-01), Sano et al.
Bettendorf Justin P.
Miller Jerry A.
Pascal Robert
Rode, Esq. Lise A.
Sony Corporation
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