Television – Image signal processing circuitry specific to television – Brightness control
Patent
1999-01-06
2000-12-12
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Brightness control
348806, H04N 568
Patent
active
061605921
ABSTRACT:
A brightness adjustment device for a display device including a microprocessor for outputting a brightness control signal according to a synchronizing signal provided from a display signal source; a parabolic wave generator for generating a parabolic wave according to the brightness control signal supplied from said microprocessor; a video pre-amplifier for summing a video signal provided from the display signal source and the parabolic wave supplied from the parabolic generator and amplifying the summed signal; and a video main amplifier for amplifying the video signal supplied from the video pre-amplifier and outputting the amplified video signal to a cathode ray tube. A method of brightness adjustment for the display device using the brightness adjustment device includes the steps of: receiving a synchronizing signal from a display signal source at the microprocessor; receiving a video signal from the display signal source at the video pre-amplifier; recognizing a frequency of the received synchronizing signal; generating and outputting a brightness control signal according to the discriminated frequency; generating and outputting a parabolic wave according to the brightness control signal; summing the parabolic wave and the video signal; amplifying the summed signal; and outputting the amplified signal to the cathode ray tube.
REFERENCES:
patent: 5596375 (1997-01-01), Kwon
patent: 5699127 (1997-12-01), Ando et al.
Kostak Victor R.
Samsung Electronics Co,. Ltd.
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