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Originally Posted by HarryT
That's correct. LCD displays don't flicker - the display remains absolutely static, with zero flickering, for as long as power is applied. As you say, the refresh rate of an LCD screen is purely to allow video, etc, to be displayed smoothly. It doesn't in itself make the display flicker. However, the LED backlighting that LCD displays use can flicker (normally at the mains frequency of 50/60Hz).
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I think you might find, that the flickering still occurs (pulse modulation), but techniques are used to mask it ... counteract it if you like.
And what one persons consciously sees doesn't always match that of another. Take my wife for instance with our Sony Bravia LED LCD TV. She sees flickering, I don't. She also has to wear glasses, I don't. She has had issues with many devices because of screen flicker.
If the flicker is there, whether you can consciously detect it or not, it taxes the eyes and mind. So my understanding of LCD technology, is that it will always have a visual/mental impact, though of course they try all sorts of things to mitigate or lessen the impact.