E-ink is commonly used in signage where it won't need to change again for a week or more. 15 seconds is fine when your required average refresh time is measure

E-ink is commonly used in signage where it won't need to change again for a week or more. 15 seconds is fine when your required average refresh time is measure in days. I am really looking forward to the day when high refresh rate e-ink displays are common. The B&N Nook from about 8 years ago could be modified to successfully play flappy bird at about 10hz, but it was pretty ugly to use, requiring a black/white full clear of the screen to zero out the image every 30 frames or so.