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From what E-Ink says on their website, the manufacturing process for E-Ink screens is similar to producing LCD screens, so I would expect the quality control procedures to be similar. I remember reading in computer magazines where people wrote in about bad pixels on their LCD monitors, and it was explained that one or two bad pixels near the edges are deemed acceptable. The Reader screens are 1/4th the area, so each pixel matters more, and bad pixels are more noticeable. (I don't think Sony is manufacturing the screens, but I do wonder if/how the quality control procedure was changed for this product. Checking every single screen for dead pixels is probably cost-prohibitive.)
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