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I created some QR code just for fun, then tried to read them with my phone. When I display them on laptops, my phone read them just fine. But when I tried to read the exact same codes displayed on CRT screen.. none of them succeeded, from the mini one with very short text (10 characters) to the large one with very long link, displayed as full screen image. Later I read here that reading on CRT is not supported anyway. So, I'm curious, why QR code can't (or maybe hard) to read on CRT screen? Is it refresh rate, the color, the brightness, or anything else?
@martheen It's not the dark bar but that the image on a CRT is 'painted' a very small piece at a time, your eyes just can't see this, but the camera can. The camera can't get a good image because it only sees the painted part, which is a small part of the whole image. – Rich Homolka – 2011-03-16T16:23:05.053