Converter circuit and monochrome picture display device comprising such a converter circuit
First Claim
1. A converter circuit, having three inputs to each one of which a bivalent color signal (R, G and B) is supplied, for converting these bivalent color signals into a monochromatic signal (Y) appearing at an output thereof, having an amplitude which is different for each color combination, the converter circuit comprising an adder circuit and a non-linear circuit coupled to the adder circuit for obtaining a plurality of increased amplitudes of the monochromatic signal for color signal combinations corresponding to the lowest amplitude, differing from zero, of the monochromatic signal.
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Abstract
To display bivalent color signals in a monochrome picture display device so that the original color remains recognizable by choosing a suitable luminance ratio, and colors having a low brightness are displayed with a sufficient degree of visibility, the combination of a sum signal and a correction signal is formed from the bivalent color signal, wherein the color differences are derived from the sum signal and the correction signal ensures the basic luminance.
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5 Claims
- 1. A converter circuit, having three inputs to each one of which a bivalent color signal (R, G and B) is supplied, for converting these bivalent color signals into a monochromatic signal (Y) appearing at an output thereof, having an amplitude which is different for each color combination, the converter circuit comprising an adder circuit and a non-linear circuit coupled to the adder circuit for obtaining a plurality of increased amplitudes of the monochromatic signal for color signal combinations corresponding to the lowest amplitude, differing from zero, of the monochromatic signal.
Specification