General > General Technical Chat
An expensive TV is a poor investment, and people spend FAR too much on them
bw2341:
--- Quote from: tooki on February 07, 2022, 07:07:37 pm ---There have been LCDs with subpixels beyond RGB, notably Sharp’s Quattron which added yellow. Single-chip DLP projectors all use multicolor filter wheels, including very high end ones.
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I'm going to have to agree with BrianHG on this one. White channels are a clever workaround to make up for deficiencies at the expense of picture quality. Pure RGB direct emission is the way to go.
Sharp’s Quattron was a short lived product. High brightness business grade portable DLP projectors need white on the filter wheel, but high end home theatre DLPs have moved to RGB LEDs or laser light sources. To achieve the highest brightness and picture quality, movie theatre DLPs have three DLP chips and RGB lasers.
A white channel reduces the colour gamut at high picture levels. Imagine that the white, red, green and blue channels can reach 60% of the desired maximum brightness. Typical medium brightness colours would be perfect, even if you use as much white as possible. But what happens if you need pure red 75%,0%,0% ? You need to compromise the picture quality in some way. You can either reduce the colour purity or dim the pixel below the desired brightness. That would be either 15%W,60%R,0%,0% or 0%W,60%R,0%,0%.
From what I've read, LG WOLED TVs have significant image processing behind the scenes. There is a very aggressive automatic brightness limiter because of a strict power budget for the whole panel. This means that a full screen of pure white is very dim compared to pure white box in the middle of normal image.
tooki:
--- Quote from: G0HZU on February 07, 2022, 10:22:32 pm ---I'm still watching an old Pioneer Kuro plasma that I purchased new in 2009. These were the last of their kind and the image quality can be really good with plasma. It also has its limitations so I've always yearned for something better when it finally dies.
I expect I'll buy a decent OLED model to replace it and this will probably cost more than I paid for the Pioneer plasma in 2009. I'd happily pay double if I get a significant improvement compared to the (flawed but still impressive) plasma image quality.
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FYI, when Pioneer discontinued plasma production, they sold the Kuro technology to Panasonic, so at minimum the late higher-end Panasonic plasmas in essence are Kuro panels.
My Panasonic is a 2008 model (I got it in 2009, when I was able to buy the top-of-the-line 2008 model for the same price as the entry-level 2009 model.), so it can’t be a Kuro in disguise, and it’s still a great TV. The black levels aren’t as black as modern LCDs (never mind OLED), but the color quality and viewing angle are superb.
tooki:
--- Quote from: tom66 on February 07, 2022, 11:29:23 pm ---
--- Quote from: tooki on February 07, 2022, 09:39:58 pm ---It’s not a boost, dude. :palm: It’s replacing the white component of the RGB channels. That’a a dynamic subtractive process.
And you do realize that computation can be analog? (Just like the YUV->RGB transform done in analog color TVs.) I never said it had to be digital.
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If R+G+B = W, and the colour balance of the white pixel is set such that the output of the white pixel equals the sum of three equivalent RGB pixels at similar luminosity, I can't see why it would change anything about the colour balance. All of this colour mixing nonsense just sounds like "videophoolery". Our eyes have three cones, and the red and green cones sense very similar wavelengths. What we see is going to be limited to that - so why would using a colour model that is different create such a vastly different experience?
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Exactly. 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?
magic:
--- 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?
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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
NiHaoMike:
--- Quote from: tom66 on February 07, 2022, 11:29:23 pm ---Our eyes have three cones, and the red and green cones sense very similar wavelengths. What we see is going to be limited to that - so why would using a colour model that is different create such a vastly different experience?
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Except for the few who have 4 kinds of cone cells.
https://en.wikipedia.org/wiki/Tetrachromacy#Humans
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