Joined on Nov 7, 2011


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In reply to:

Neoasphalt: Mr. Fossum,
I would like to get answer from expert as you on the following question - if the given size sensor pixel density would be reduced, lets say four times, from common 16 to 4 MP (enough for people who don't print their images) and made with the same latest CMOS technology, will this result to significantly:
1. Lower noise
2. Higher dynamic range
3. Better tonal range
4. Higher color depth
5. Cheaper production costs
6. Or other possible improvements?

Thank You

One of the initial assumptions seems dubious to me. If you already have a 16M process, then a 4M imager would use the same sized pixels, with 1/4 of the overall active area, and get the large boost in wafer yield that would make it profitable to sell the 4M imager. Upping the pixel area, is unlikely, particularly for a consumer imager, since the yield would be comparable to the 16M, and you'd have to sell it for about the same amount, which is a non-starter.

To the first approximation, the noise performance of a same-sized pixel 4M would be comparable to slightly better. Assuming the same frame rate means that the readout rate could potentially be reduced, which generally lowers overall read noise. Since there are fewer reads in the array itself, clocking and other related noises should be reduced.

Link | Posted on Nov 7, 2011 at 20:50 UTC
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