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Unfortunately, there is a problem. Everything is fine if you are looking at the same position on the screen. But you are not (subjects are moving or you just want to observe different parts of the screen). In that case, your eye would be summing those pulses differently than it was intended, so some parts of the screen would appear considerably brighter or darker. It is called FALSE CONTOURING.
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To differentiate this effect from regular false contouring the effect you describe above is called Dynamic False Contouring because there has to be movement to initiate the visual effect.
I think this could be a really useful thread
There's a whole host of issues in our flat panel displays that limit the performance when there is motion. Some is inherent in the MPEG compression used in digital TV broadcasts anyway and some is due to the nature of progressively updated displays.
When you add in the plasma issues eg dynamic false contouring and dithering you end up with various reasons why the image doesn't look 'right' when there is motion