Answer; Electric Paper Display
Step-by-step explanation:
"PDs are extremely thin and only require power when a new image is requested. Instead of a traditional display that uses backlighting to illuminate pixels, an EPD is based on the scientific phenomena known as "electrophoresis," the movement of electrically charged molecules in an electric field."
Above is the definition, as you can see it resembles your question greatly so this is most likely the answer you're looking for.
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