These screens have not only gotten brighter but as of 2012 also bigger in size, emitting even more light. I’ve gone from iPad Touch to iPhone by now and each generation of i-device since my first Touch has gotten a brighter LCD in it. This is for a lot of people the year where sleep quality started taking a hit □Ī year later the iPhone App Store launched so these devices became even more interesting. Suddenly a bright display is with me everywhere, including in bed as I tinkered around with it before I fell asleep. Basically it filters out blue light from your display so that your natural sleep rhythm is not as impacted. The earliest reference I can find is from 2009 but I am confident I was using this (or something like it) long before that. I want to say 2005/2006 maybe when I started using it, an early iteration of it or an app that did something similar.
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