When I was in high school, they installed the first generation of smart boards. The resolution and quality of pen input was quite mediocre. But it solved an actual severe problem for teachers and students. Back then we used sponges to clean boards but this can lead over long period of time to skin diseases. Furthermore, the sound of chalk on a board was torture. An alternative would have been those smooth boards but they get really hard to clean over time and pens seem to be always empty. Lastly, you actually get to the material from previous lessons and can even upload them. I think those smart board need to be iterated on more. If displays are to difficult to repair, maybe e-ink paper might be an option in the future.
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