Why Do LCD Screens Produce Ripples When You Touch Them?

If your desktop/laptop screen shows those 'ripples' when you press a finger against it, then it implies that you have a LCD screen. Note that you won't notice such 'ripple effect' in a CRT monitor...

Table of Contents (click to expand) Liquid Crystals Pixels Why Do LCD Screens Ripple? What Is ‘Pooling Mura’, And Why Does The Ripple Trail Your Finger? Can Poking Your LCD Screen Actually Damage It? LCD screens ripple when you press them because pressing the screen physically disturbs the alignment of the liquid crystals inside the affected pixels. Each pixel relies on those crystals being twisted in a precise pattern to filter the right amount of red, green and blue light through; squash them and the polarisation gets scrambled, so you see rainbow-coloured ripples around the contact point un

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