PPI, or pixels per inch, is simply an indication of how great the pixel density on your screen display is. Your screen is made up of these tiny little dots, and if there’s more of them, your display is crispier. Likewise if you have less pixels, your Pixels Per Inch is less and the quality is not as great. Here’s a great pic showing what I mean, if you’re a bit confused:
PPI can be found in all electronics that use pixels. This is actually what manufacturers are talking about when they say “HD” and “4K”. An HD TV will have more pixels than a normal one, and as such will appear like a better quality. Here’s another nice pic:
So how is this important to you? As you might’ve figured out, the more pixels there are on your phone, the greater the quality. Not too long ago, the best phones had PPI’s that are found on today’s budget phones. For example, the Galaxy S3 came in with 306ppi. This was considered excellent at the time, but you can easily get a budget phone, like the Moto G, with almost the same PPI.
Simply put, spend more money on your next Android and your PPI will be better. The Galaxy S6 comes in with a whooping 577 pixels per inch.
It’s also important to realize that the more pixels there are, the greater the strain the phone. Battery life and processing power will be put under huge stress, and the overall experience might not be worth sacrificing for a few extra pixels.
They adopt different layouts in order to get the best possible colors and power efficiency.
Fact: Pixels don’t have a brightness. They are very dull and cannot give off light of their own. There’s something called a backlight behind the pixels that can be adjusted and gives off white light. This mixes with the pixels and gives the final output.