This is somewhat an economics and manufacturing question, so apologies if it's a bit off-topic but I don't know where else to ask.
I have a 17" laptop with 1,920 by 1,080 resolution, which is nice. But some smartphones have the same resolution on a much smaller screen.
By my calculations, if my laptop had the same ppi as the phone, the resolution would be about 7,000 by 3,800.
So why isn't this a normal resolution? 8k resolutions for TV are just being considered -- why aren't we ahead of the curve?
A napkin cost per square inch calculation shows that such a screen would cost several hundred dollars. Pricey, but not unheard-of.
The total pixel count goes up by about 13 times, but the graphics card can shunt out framerates in the hundreds of hertz, so that shouldn't be a problem (for 2D at least).
It seems like this technology should have been on the market years ago. What's the bottleneck?