I read something a long time ago that explained dithering first being found useful on analog navigation gauges on air planes. The early gauges were not very accurate when testing but once the plain got off the ground the constant vibration of the engine prevented the gauges from sticking. Kind of like tapping on an old watch to get it moving again. They then started vibrating the gauges in the test labs to make sure they were accurate. This saved hundreds of gauges that were previously thought to be defective.

Does the noise in your head bother me ?