Video signal processor for two-panel liquid crystal projector

A video signal processing apparatus for use in a two-panel liquid crystal projector, comprising:

• a luminance/chroma processor for receiving a luminance signal and a chroma signal and for generating a first luminance signal and a plurality of color difference signals;
• a matrix circuit for receiving the first luminance signal and the plurality of color difference signals and for generating a second luminance signal and a plurality of color signals using one of the plurality of color difference signals as a reference;
• and
• means for receiving and processing the second luminance signal and the plurality of color signals, so as to be used by a luminance signal liquid crystal panel and a color signal liquid crystal panel, respectively, wherein the plurality of color difference signals generated by said luminance/chroma processor includes a R-Y color difference signal, a G-Y color difference signal and a B-Y color difference signal, and wherein said matrix circuit comprises:
• a minimum value detector for detecting a minimum value among values of the plurality of color difference signals output from said luminance/chroma processor;
• a first subtracter for subtracting the minimum value from the R-Y color difference signal output from said luminance/chroma processor to generate a red color signal;
• a second subtracter for subtracting the minimum value from the G-Y color difference signal output from said luminance/chroma processor to generate a green color signal;
• a third subtracter for subtracting the minimum value from the B-Y color difference signal output from said luminance/chroma processor to generate a blue color signal;
• and
• an adder for subtracting the minimum value from the first luminance signal to generate the second luminance signal.

A video signal processing apparatus for use in a two-panel liquid crystal projector comprising:

• a first color signal generator for receiving a first luminance signal and a chroma signal and for generating a first red signal, a first green signal and a first blue signal;
• a luminance signal generator for receiving the first red, green and blue signals and for generating a second luminance signal, which is supplied to a luminance signal liquid crystal panel based on one of the first red signal, the first green signal and the first blue signal;
• and
• means for receiving the second luminance signal, and the first red signal, the first green signal and the first blue signal and for generating second red, second green and second blue signals which are supplied to a color signal liquid crystal panel.