The Joy of Pixel Density

Started Jul 13, 2008 | Discussions thread
Andrew dB Contributing Member • Posts: 970
Re: Density limits - trace width & diffraction

Dave Martin wrote:

There must be a pixel density limit related to the line width of the
conductive traces on the ccd device itself.

Since the lines are finite size a pixel's active area's smallest size
is limited.

Say for example that the line width for a particular technology is 10
nm. At a pixel pitch of 57 nm (Typical ASP-C), 47 nm is available for
the photosensor. At 29 nm (typical 1/1.8"), 19nm is available. No
space is left for the photosensor itself at a 10 nm pitch.

A few orders of magnitude out here. :0)

Intel's current cutting edge for processors is 45nm and I believe 32nm is being used by some companies on less complex structures such as memory.

A typical APS-C pixel is 5.7µm or 5700nm across so there's plenty of space for electronics. Granted, it's unlikely that Canon or anyone else is using a state of the art process node for sensor manufacture but it suggests that there is some way to go yet. Even visible light is no less than 400nm in wavelength so I doubt we'll see pixels ever needing to push the limits of what chip manufacturers can do.

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