# Multi-layer CCD

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A '''multi-layer CCD''' is a [CCD](/source/Charge-coupled_device) [image sensor](/source/image_sensor) that captures true RGB using stacked CCD sensor layers.

This concept was the subject of a 1978 [Kodak](/source/Kodak) patent application (issued 1986),<ref>{{US patent | 4613895}} "[https://patents.google.com/patent/US4613895 Color responsive imaging device employing wavelength dependent semiconductor optical absorption]" Bruce C. Burkey et al.</ref> but did not result in a working image sensor.

The concept resurfaced as part of an [April Fools' Day prank](/source/April_Fools'_Day) press release from [http://www.dpreview.com/news/0004/00040102canonccd.asp dpreview.com]. When the joke was released in 2000, a remarkably similar device was under development at [Foveon](/source/Foveon)—the [Foveon X3](/source/Foveon_X3) [image sensor](/source/image_sensor), which is multi-layered but is not a [CCD](/source/Charge-coupled_device). The Foveon sensor was announced on [http://www.dpreview.com/news/0202/02021101foveonx3.asp dpreview.com] in 2002, with [http://www.dpreview.com/news/0202/02021103foveonx3preview.asp sample images].

==References==
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Category:Image sensors

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Adapted from the Wikipedia article [Multi-layer CCD](https://en.wikipedia.org/wiki/Multi-layer_CCD) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Multi-layer_CCD?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.