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The primary reason a 1080p projector delivers a blurry and dim image when receiving a 4K signal is due to forced downscaling and signal processing overhead within Windows. When a projector's input exceeds its native resolution, it must compress 4K data to fit its physical 1080p pixel grid, leading to lost detail and fuzzy text. Additionally, poor signal compatibility can cause color gamut compression or frequency mismatches, further reducing overall brightness.
Fuzzy text sample:
Normal text sample:
You can resolve this issue using one of the two solutions below:
1. Set the casting resolution to 1920 x 1080 via your dedicated GPU settings in Windows.
2. Follow the video below to adjust the EDID settings on your projector.
