The lower-resolution image needs to be upconverted, or stretched, to fit on the screen. For example, the on-screen image, including the wallpaper, will look very blurry if the monitor supports a 1920 by 1080 resolution, but Windows 8 is configured to output at a 1366 by 768 resolution. LCD monitors scale lower-resolution image content to line up with higher-resolution screens, but may appear blurry because the screen can't evenly adjust the image detail.
Older CRT monitors are very good at changing resolutions however, LCD monitors are designed to only run in a specific resolution. Configuring your monitor to use a higher resolution when possible may help resolve blurry wallpaper. The human eye can discern block-like irregularities in a low-resolution image that's stretched out over a large viewing space. Monitors with higher resolutions relative to the screen size produce a sharper-looking image. Windows 8 requires running a resolution of at least 1024 by 768 pixels however, it's likely that your screen supports a higher resolution. These issues likely arise due to Windows 8's compatibility problems with lower-resolution screens. Desktop wallpaper can be detailed or visually impressive, so that if there are any resolution problems, you will immediately notice them. Blurry desktop wallpaper on a Windows 8 system may be an indication of a problem with the device's display settings.
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