system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why it's hard to see LCD screens in direct sunlight. And while we're at it, how some screens like on the Kindle resolve this.
gpt
LCD/LED are 'backlit' displays. They work by having a light source behind the screen. LCD works by filtering a white light into different colors, like a stained glass window. LED works by having many tiny light bulbs that turn on and off like a neon sign. To see the image, the display has to overpower any background light, like the sun, which is usually much brighter.

Kindles use 'e-ink'. These displays are not actively lit up by themselves. They are simply pigments which are moved around, like an etch-a-sketch. You need external light to see them, so the sun actually helps.

Backlit displays will shine in a dark room like a flashlight. E-ink will not, like a newspaper.