General > General Technical Chat
An expensive TV is a poor investment, and people spend FAR too much on them
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tooki:

--- Quote from: magic on February 08, 2022, 08:59:18 am ---
--- Quote from: tooki on February 08, 2022, 07:40:56 am ---It sounds to me like he thinks they’re just adding white to all the colors indiscriminately, washing it out, or that it’ll somehow reduce the available color space?

--- End quote ---
He says that this is what they do to exceed the brightness available from RGB pixels alone when such brightness is called for.

Which doesn't sound completely implausible. Consumer technology is crappy like that and it doesn't get more consumer than TV :P

--- End quote ---
But that’s not what the white is for per se. It’s to offload the white component of the RGB value to a white subpixel to reduce wear on the blue subpixel. It’s not that the RGB subpixels can’t achieve the desired brightness, it’s that doing so wears out the blue subpixel faster.
tooki:

--- Quote from: Zero999 on February 08, 2022, 01:52:47 pm ---I don't see how adding an extra colour such as yellow, or white, especially the latter, can be a good thing for colour definition. It will increase intensity, but at the loss of colour definition, at higher intensities.

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It’s the exact opposite: while human vision peaks at certain wavelengths, our color receptors actually have very shallow curves, meaning we are still quite sensitive to other wavelengths besides the peaks. This, together with the reflectivity characteristics of objects, is why so many physical objects look awful under RGB “white”. And while we can simulate many colors on displays with well-chosen RGB wavelengths, it’s not 100%, and yellow is one area where we are really sensitive to it being “off” because skin tones are yellows to reds. Hence Sharp’s attempt to improve color rendition with a yellow subpixel. It certainly wasn’t for brightness, since if anything, the added pixel structure reduces overall brightness.
coppice:

--- Quote from: tooki on February 08, 2022, 04:58:37 pm ---while human vision peaks at certain wavelengths, our color receptors actually have very shallow curves,

--- End quote ---
Well, of course they do., If they only responded to 3 narrow spectral bands we'd have some really funky gaps in our vision.
TimFox:
Exactly.  A wavelength between two broad peaks in the human eye's sensitivity spectrum excites more than one receptor.
Note that although "wavelengths" (e.g., narrow laser spectra) have "color", a "color" or "hue" typically has a broad spectrum of "wavelengths".
What is the wavelength of "brown"?
magic:

--- Quote from: tooki on February 08, 2022, 04:52:39 pm ---But that’s not what the white is for per se. It’s to offload the white component of the RGB value to a white subpixel to reduce wear on the blue subpixel. It’s not that the RGB subpixels can’t achieve the desired brightness, it’s that doing so wears out the blue subpixel faster.

--- End quote ---
It makes other pixels smaller so saturated colors can't reach the same level of brightness anymore, or the pixels are driven harder than before under such conditions (and may wear out faster still).

And there is obvious marketing benefit in cranking up contrast by cheating with those white pixels.

For anyone interested, the controversy should be easy enough to settle by observing Windows BSOD under a loupe :horse:
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