Electronic – How does it work: smartphone pixels are turned off when heated

lcd

I saw this video:
https://youtu.be/urbhA37a70c?t=1m45s

In the video you will see that the pixels of a smartphone are turned off when heated. The pixels are turned back on again when they cool down. Does each pixel has a temperature sensor? 😮

I wonder how it works.

Best Answer

This is known as the "clearing" temperature of the LC material. Because they are quasi crystals whose behaviour is dictated by inter-molecular forces (typically van der Waals) this is easily disrupted by thermal energy. The hotter it becomes the more the material vibrates and the less likely that the crystalline structures will form. The lower temperature limit is due to viscosity.

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