>They used cold cathode backlights, which have a wider color gamut than standard LED backlights.
That's a misunderstanding of what color gamut is.
A CCFL produces a wide spectrum of colors, or generally, white light. The filters behind the LCD panel then filter out three narrow-band pieces of the spectrum to put through the RGB subpixels. The narrower the filters, the narrower the spectrum and the more precisely you get just one blue, green, or red, through the LCD.
That affects the color gamut. If the filters are wide and "dirty", all the colors become desaturated, which means the color gamut is narrow. When the colors are pure, the gamut can be wide. It is not necessarily wide, because that depends on what exact colors you choose in the triplet, but assuming you chose a wide color triplet then the gamut is the widest when the colors are pure.
Now, because the filters are narrow they reject most of the light from the CCFL tube, and that means the display is either dim, or uses a fuckton of power to burn a nuclear powered backlight, which also causes backlight leakage, so with CCFLs it's alway a compromize between brightness and color quality.
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