Vidit Bhargava (via Ryan Jones ):
In an OLED screen, the black pixel is essentially a pixel that is turned off. It uses no power. This is why OLED is able to display such rich dark colors and why dark themes are effective.
However, when an interface that uses a black theme for the background begins to display content on the screen, the pixels must turn on before they can display the content. So, as you scroll through the contents of a black background, the pixels find it difficult to keep up with the scrolling, resulting in a smear on the screen.
He solves this by using dark gray, which still uses considerably less power than white.
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