Why do we still have no (phone) screens that are still readable in sunlight?

Question

Some years ago there was this „paperlike kindle“ that was advertised with: „you can read it in bright daylight!“ and then we never heard about this invention again.

Edit: thanks for your input. I think I understand now.

In: Technology

Answer 1

But we have. My Galaxy S23 Ultra passes the “readable in midday sun” test. It draws down the battery quite fast though when I’m doing this.