Full HD on a 4K monitor looks worse than on a Full-HD monitor.
This happens due to blur added by all monitors and absolute majority of TVs at any scaling ratio, though this could be avoided when enlarging by an integer number of times (e. g. 2 in case of FHD→4K).
As a result, sharpness in 3D games is decreased, white lines are gray, and pixel art is not pixel art anymore.
Each logical pixel could be displayed as a square group of integer (2×2, 3×3) number of physical pixels of the same color without mixing-in colors of adjacent pixels.
Such lossless scaling is already built into graphics drivers and removes blur regardless of monitor or TV used. But scaling via graphics card (GPU) cannot help if the signal source is not a computer, but e. g. a video player or a game console.
Also, GPU scaling wastes bandwidth of video interface (HDMI, DP). This may sacrifice refresh rate and color depth.
- Complain of blur to technical support of your monitor/TV manufacturer.
- Ask about support for nonblurry scaling in comments to reviews of monitors and TVs in mass media.
- Request the feature for game engines that don’t have it.
- Tell about the issue to as many people as possible.
- AMD: supported for GPUs based on the 2nd-generation GCN () and newer architectures in Radeon Software 2020 (19.12.2+) () for Windows 7/10; being implemented for Linux.
- Intel: supported for Gen11 GPUs in the driver 18.104.22.16855+ () for Windows 10; available since in laptops equipped with Gen10 CPUs based on the Ice Lake architecture.
- nVidia: supported with limitations for RTX and GTX 16* in the driver 436.02+ () for Windows 10; incompatible with HDR, custom resolutions, DSR, 4:2:0, sharpening, and hybrid-GPU laptops.
- Linux: supported in Proton 4.11-10+ () (used in Steam Play); limited support in XRandR 1.5.1+ () and nVidia graphics driver 384.47+ (): image is cropped in many games.
- Monitors: announced for the 27″ QHD and 4K monitors Eve Spectrum based on LG IPS panels with HDR support and refresh rates up to 144 (QHD, 4K) and 240 Hz (QHD); expected in Q3 and Q4 ; preorder is available.