Yup. Sounds like the Foveon sensor.
<http://www.dpreview.com/news/0202/02021101foveonx3.asp>
Chuck Norcutt
Winsor Crosby wrote:
> Doesn't this seem like it has been done?
>
> 3/20/2006 12:19:00 PM
>
> Fujifilm Develops New Image Sensor Technology for Digicams
>
> Fuji Photo Film Co. Ltd., Tokyo, Japan, has developed a new basic
> technology for a new type of image sensor that ensures 3x higher
> sensitivity and richer color depth than conventional image sensors,
> reports PhotoImaging Enterprises Association International's PEN News
> Weekly.
> In today's digital cameras, images are captured and converted into
> digital signals by triplets of CCDs placed side by side -- one each
> for red, green, and blue. It is difficult for ordinary photographers
> to realize that a digital image captured with a digital camera has
> less depth than pictures taken with film in which the photosensitive
> pigments for the three primary colors of red, green, and blue are
> layered above one another, but pro photographers can recognize this.
> Adopting the same concept of layering, the new image sensor developed
> by Fujifilm uses organic pigments reacting to red, green and blue
> light. The pigments are sandwiched between transparent electrodes and
> stacked above one another. When light enters each pigment layer,
> electric current flows between the electrodes, and the electric
> current is then converted into digital signals.
> Fujifilm has made a prototype image sensor containing a green-
> reacting pigment. It yields monochrome pictures having the same depth
> as photo film, and is now making prototype elements for red and blue
> light as well. The company has filed a patent application on the
> basic technology and hopes to commercialize new image sensors in
> three to four years, says PEN News Weekly.
>
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> Winsor
> Long Beach, California, USA
>
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