More detailed explanations:<p><a href="http:&#x2F;&#x2F;www.mvkonnik.info&#x2F;2009&#x2F;04&#x2F;brief-note-about-lcd-displays.html" rel="nofollow">http:&#x2F;&#x2F;www.mvkonnik.info&#x2F;2009&#x2F;04&#x2F;brief-note-about-lcd-displa...</a><p><a href="http:&#x2F;&#x2F;www.solomon-systech.com&#x2F;files&#x2F;ck&#x2F;files&#x2F;Application%20Notes&#x2F;TFT%20Flickering%20Application%20Note_1.1.pdf" rel="nofollow">http:&#x2F;&#x2F;www.solomon-systech.com&#x2F;files&#x2F;ck&#x2F;files&#x2F;Application%20...</a><p>tl;dr: the liquid crystals in LCDs need to be driven with AC voltage to prevent electrolysis degradation. This is known as &quot;inversion&quot; and there are different patterns used. If the magnitude of the + voltage is different from the - voltage, i.e. the &quot;common&quot; voltage Vcom is not exactly in the middle, the subpixels change brightness slightly on each cycle and this causes flicker. The flickering becomes much more noticeable if the pattern displayed in the image matches the inversion pattern.<p>Neither of my (nearly 10 years old now... but still working well) LCD monitors flicker on all the images, so this is something that shouldn&#x27;t be occurring on a good monitor. I suppose manufacturers now are relaxing the tolerances to save cost, justifying it by the fact that flickering is not observable on &quot;most&quot; (debatable) content.