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[OM] OT CCD

Subject: [OM] OT CCD
From: Jim Terazawa <jimt@xxxxxxxxxxx>
Date: Thu, 10 Feb 2000 18:49:22 -0600
Please allow me to inject some of my knowledge on CCDs.

CCD stands for charge coupled device.  When people talk about CCD
imagers, they are really talking about CCD sensers and shift registers
that already have RGB filters embedded on one chip.

The incorporation of RGB filter is done at the silicon wafer process.
The dyes used for RGB are also implanted at the wafer process step.
The area of each dye are equivalent to the size of the sensing pixel
(~3.4um2 for the 3million pixel CCD).  Therefore, unlike the method
used over 15 years ago, where glass filters were installed by hand,
the miniatualization of the pixel filters with the semiconductor
process enable to separate RGB more accurately.

I will not get into the details of how CCDs work, since this is
more to do with semiconductor physics.  Like someone in this
List explained about 'bucket' is a good analogy.  As matter of
fact the early days of CCD were called bucket brigade device,
since the electron charges are transfered in these adjacent 'buckets'
with timing clock pulses.  The concept is still the same with
today's large area CCDs.

Regards,
Jim Terazawa

Wayne Shumaker wrote:

> How does a ccd or cmos sensor separate out the RGB colors?
>
> Wayne


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