Re: Is OLED the future of flat panel TV technology?

"RSweeney" <dockscience@xxxxxxxxx> wrote in message news:qamdnVB-jY86ahHVnZ2dnUVZ_rmdnZ2d@xxxxxxxxxxxxxx

"Leonard Caillouet" <nospam@xxxxxxxxx> wrote in message news:toNik.2232$QX3.2034@xxxxxxxxxxxxxxx
"rjn" <email4rjn@xxxxxxxxx> wrote in message news:477b7c03-fbc7-4bb0-b0a9-583cd65a26da@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Chiefmfg <chief...@xxxxxxxxx> wrote:
as LED backlighting
slowly replaces CCFL (which also improves color gamut
and accuracy).
Regards, Bob Niland

Please provide some spectral plots to support the notion that color gamut and accuracy are improved with LED sources over CCFL. Those that I have seen indicate that, while primary saturation might be extended, the spectrum of most LEDs does not represent the CIE standard observer curves very well at all. Extended gamut as a benefit is really a myth. Proper reproduction of the gamut for a given application is accuracy.

Leonard

Leonard, here is a nice paper on the topic

http://www.nec.co.jp/techrep/en/journal/g06/n03/060316.html



This says nothing nore than the previous poster's link. Everyone takes the manufacturers at their word that wider gamut is a good thing, and the spike of a spectrum that LEDs produce is a good thing because it gives greater saturation of the primary. What about the colors in between? Sure, color science says that with the right mix of the three primaries you can produce everything in the triangle, but exactly what does that mix need to be for a given point that is not a primary color? Filters will smooth the spike out some, but the resulting spectrum still does not yield a match for the standard observer curves. This means that for proper color management you not only have to scale the primaries to the gamut that your source uses, you have to have a mapping scheme to get the right mix for any particulary color in the gamut for the particular spectrum that each primary has. When they get serious they will publish the spectral plots for each primary after the color filters, along with the color management functions and/or LUTs for each set.

When video engineers adjust the response of their primaries in cameras, do they adjust them for the most narrow peak in response of each color? If LED spectra are the optimum, why not?

Leonard

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Relevant Pages

  • Re: Is OLED the future of flat panel TV technology?
    ... gamut and accuracy are improved with LED sources over CCFL. ... the spectrum of most LEDs does not represent the CIE standard observer ... color science says that with the right mix of the three primaries ...
    (alt.tv.tech.hdtv)
  • Re: Is OLED the future of flat panel TV technology?
    ... Please provide some spectral plots to support the notion that color gamut and accuracy are improved with LED sources over CCFL. ... Those that I have seen indicate that, while primary saturation might be extended, the spectrum of most LEDs does not represent the CIE standard observer curves very well at all. ... This means that for proper color management you not only have to scale the primaries to the gamut that your source uses, you have to have a mapping scheme to get the right mix for any particulary color in the gamut for the particular spectrum that each primary has. ...
    (alt.tv.tech.hdtv)
  • Re: Is OLED the future of flat panel TV technology?
    ... of a spectrum that LEDs produce is a good thing because it gives greater ... of the primaries in our eyes, and then transfer those primaries uniquely into each ... not only have to scale the primaries to the gamut that your source uses, ...
    (alt.tv.tech.hdtv)
  • Re: Is OLED the future of flat panel TV technology?
    ... of a spectrum that LEDs produce is a good thing because it gives greater ... of the primaries in our eyes, and then transfer those primaries uniquely into each ... Filters won't do anything for the spike. ... not only have to scale the primaries to the gamut that your source uses, ...
    (alt.tv.tech.hdtv)
  • Re: LED lamp instead of flash?
    ... Probably because the makers know that anyone who needed ... Low-end white light LEDs are using phophors to ... I see on wiki, it's a messy spectrum, often blue-heavy. ... limit the lighting to a single source type, ...
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