"Arfa Daily" wrote in message
...

wrote in message
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Arfa Daily wrote:

The LCD only filters light from the backlight. If you don't have a
full
spectrum white in the first place the you can't expect decent colour.
White LEDs aren't quite there yet are they?

Archie


Absolutely true, except that this particular TV doesn't use white LEDs
in
its 'revolutionary' backlighting scheme. It uses small RGB arrays, which
is
why I was questioning whether there was any control over the individual
elements in each array, such that the colour temperature of the
nominally
white light that they produce, could be varied. Which would then, of
course,
have a corresponding effect on the displayed colour balance. It just
seemed
to me that given they have gone to the trouble of using RGB arrays,
rather
than white LEDs, the reason for that might have been to get a full(er)
spectrum white.

Arfa

colour temp can be controlled using the LEDs or the LCD, I'm not sure
it makes any big difference which one.

RGB LEDs would give the same white as a triphosphor&uv white LED, but
with more colour control. The standard 2 colour white LED would be
useless on a 3 channel display. And fwiw bichromic white LEDs have
huge colour balance variation, way outside of whats acceptable for a
display.


NT

Which is why, given that they've put these LEDs under at least some kind
of control in order to implement their (claimed) enhanced black
reproduction scheme, that I was questioning whether the scheme maybe
allowed for a degree of user intervention under the guise of "tint" or
whatever, and which might have accounted for why on this particular TV -
the only example that I've seen on and working so far - the flesh tones
were so poor compared to Pan and Sony offerings in the same display stack,
showing the same picture. I'm trying to get a handle on why a company with
the products and reputation of Sammy, are a) using advertising terminology
that appears to be questionable in the context that it appears, and b)
producing a set, claiming it to be the dog's ******** of display
technology, which does not appear - to my eye at least - to be as good as
their traditionally CCFL backlit offerings, or those of other
manufacturers.

I saw the latest all singing and dancing LCD HD Pan, just released, in my
friend's shop yesterday. Uses conventional CCFL backlighting. Not as thin
as the Sammy, but getting there. Apart from the usual slight gripes that
you could direct at any LCD panel when examined closely, the picture was
quite stunning, and the colour rendition was as close to 'perfect' as you
could reasonably expect. Certainly, flesh tones *appeared* accurate, but I
accept that is subjective. Anyway, whichever-whatever, more accurate than
they appeared on the LED backlit Sammy ...

Arfa




The why is pretty clear. Samsung is a whore, like all of the other vendors,
only a little more so than some others. They are interested in market share
and will create whatever hype they think will help them sell sets. The
degree to which it is actually better only has to matter up to the point
that too many people figure it out and it hurts sales. As we get better at
quantifying why the sets look a little weird on certain colors they will
improve the spectrum of the backlighting and improve the color decoding to
compensate. It won't happen if people keep spewing the nonsense that all
you have to do is hit the primary and secondary colorimetry targets to get
perfect color. That is just a starting point, and for some sets that do not
have proper color decoding or gamut, may actually be the wrong compromise.

Leonard