Why a 27-inch 4K monitor at 150% scaling matches QHD
PPI is the diagonal pixel count divided by diagonal inches. A 27-inch 4K monitor has 163.2 PPI, exactly 1.5 times QHD's 108.8, so at 150% scaling its text size and workspace match QHD at 100%.
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TV Viewing Distance: Why 55-Inch Means 1.7m and 65-Inch Means 2.0m
The recommended TV viewing distance is the screen diagonal times 1.2. Here is where that multiplier comes from, and how to reverse it into a maximum screen size.
Laptop-to-TV cables: what 4K 120Hz actually requires
Getting 4K 120Hz from a laptop to a TV depends on the ports at both ends, not just the cable. Calculating bandwidth per resolution shows exactly where 18Gbps and 48Gbps diverge.
TV size and viewing distance: the 4.13 multiplier explained
Multiply the screen diagonal in inches by 4.13 for the recommended distance in centimetres. A 65-inch set wants 268cm at the SMPTE standard and 198cm at the immersive one — which is why the same 2.7m room justifies either 65 or 89 inches.