physical width of such 15.6 inch screen is 34.53 cm so it gives you 0,025285037 cm per pixel.
so my "perfect" laptop would have 15.6 inch screen and 16:10 aspect ratio. i would double the resolution in order to avoid fractional scaling and use 200% scaling so final resolution would be 2732x1708 - anyone can recommend something close to that on the market?