http://www.hdtvtest.co.uk/news/rgbw-201510084189.htm
Who’s right and who’s wrong? To find out, we got our hands on an RGBW LED LCD television that’s available to buy in the UK (the LG 43UF690V), and conducted a series of tests in a side-by-side comparison against a 4K Ultra HD TV that uses conventional RGB subpixel layout (the Samsung UE48JU7000 we recently reviewed).
To market an RGBW LED television as 4K Ultra HD is short-sighted, running counter to the industry’s shift in emphasis from more pixels to better pixels in the next phase of UHD development. An RGBW LED LCD TV may be cheaper, but you’ll be paying the ultimate price in the form of compromised picture quality.
