I did not expect this to happen so quickly. A group of craftsmen has developed a working prototype of e-paper, which has an image change time of less than 30 milliseconds. This result was achieved through the use of not cells with a color-changing substance, but an analogue of liquid crystals - such as those used in calculators and pocket toys of the 'well wait' type. Otherwise, this analogue in theory has all the advantages of e-ink: in the sun it behaves like an image on paper and does not require electricity to maintain the picture.