, +David Mateos
: don't focus on DPI so much. It's a stupid metric when looking at different display sizes.
The thing is, you largely (not exactly) want the same resolution
across many different devices, not the same DPI. 300 DPI on a 15" laptop is mostly wasted - you're not going to hold it up as closely as you hold a phone.
That's also true of a 10" tablet (or a 11" laptop). You tend to have those things closer to you than you would a 15" laptop. Comparing DPI across the two doesn't make all that much sense.
Bigger displays are supposed to have lower DPI. We've had window environments that have made the mistake of actually trying to compute "physical DPI" (by taking the screen size into account) and using that to scale graphical elements. That's insane. The text on a 60" TV isn't supposed to have the same physical size as the text of a 4.7" phone, because you watch them differently.
So pure resolution
matters more than DPI.
Usage also matters. On a TV, you generally need lower
resolution: not because it's bigger, but because you don't watch text and edit photos on it. Moving pictures in particular need much lower resolution to look good, and 1080p is largely perfectly fine for most such content (although I certainly don't want to complain about people who want more).
Static photos need much more - you see the jaggies way
more easily. And text needs more still, because you have high constrast content and want really smooth and sharp details in ways that often don't matter for pictures.
Also, some people here have made the absolutely ridiculous statement that "1080p is enough, your eyes aren't that good". Trust me, if you believe that, you are either (a) stupid (b) blind as a bat (c) only watch moving blurry content or (d) haven't ever seen good displays.