Sundial shenanigans
Question: I left my watch exposed to the sunlight for a long time and
afterwards its LCD (liquid-crystal display) was completely black. However, when
I removed it from the sunlight and it cooled down, after a few minutes it was
back to normal again.
Could anyone tell me what happened to the display and how it recovered?
Answer: Liquid crystals used in most LCDs are long, straight molecules that
like to line up with each other, and anything else that is around. If you
sandwich a film of liquid crystals between glass plates that are are ridged like…
