Many of LG's 2017 LCD TVs use subtractive RGBW which steals every 4th subpixel and changes it to white. It helps with brightness and contrast, but reduces the TV's true resolution from 4K to 2.8K.
from PCWorld https://www.techhive.com/article/3240976/smart-tv/some-lg-4k-lcd-tvs-deliver-only-28k-resolution.html#tk.rss_all
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