Sharp is running an ad campaign, with George Takei as Spokesman, for their new Aquos Quattron TVs. This TV is different because unlike any other television that uses 3 colors to each pixel (Red Green Blue), the Sharp Quattron uses 4 colors (RGB + Yellow) to each pixel.

When will this TV be for sale?

The end of April.

http://gadgetynews.com/sharp-aquos-quattron-tv-brings-in-yellow-fourth-pixel-rgby/

First result when Googling "Quattron".