A Kindle is a reflective screen…it uses the sunlight to make the image. When the sun gets brighter it gets brighter, just like a piece of paper.
A mobile phone screen is back-lit…there’s a light (well, a whole bunch of tiny lights) behind the screen that light it up. They’re pretty powerful in normal indoor lighting but nowhere near as powerful as bright sunlight. When you’re in sunlight your eyes adjust to the brightness and your screen just can’t keep up, so it looks dim.
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