Since blue light is harmful to your eyes, blue light filters like f.lux have become popular. But Samsung took a different approach with the screen on the new S10 phones and instead shifted the blue light wavelengths emitted by the screen to the right. It's interesting to think about how this interacts with your eyes to make the screen look the same. See the last bullet on this page for an illustration: https://www.samsung.com/au/support/mobile-devices/galaxy-s10-cinema-display-blue-light-protection/