[opendtv] Re: Use your TV as a computer monitor: Everything you need to know
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 19 Jun 2017 20:33:26 +0000
Jeroen Stessen wrote:
I am not suggesting that an LG OLED RGBW TV has a reduced resolution.
There are as many pixels as on an RGB TV, but they are composed of 4
square sub-pixels in a larger square pixel. LG do this to improve
the efficiency. Because of the RGB color filters the white sub-pixel
is three times as efficient in making white light as the R+G+B
together. They simply send MIN(R,G,B) to W and the remainder to 0 to
2 of the R,G,B.
I went to one of our Best Buy so-called "Magnolia" section a week ago - that's
where they have their premium stuff - and saw a huge LG OLED 4K HDR TV. The
demo was (obviously) stunning, showing scenes of what looked like one of the
Greek Aegean islands, with most likely exaggerated colors. Still, very gorgeous.
The salesman explained that this was OLED, so I asked about longevity of the
display, since that was a major stumbling block of OLED. He essentially stated
what you just wrote there, Jeroen, and claimed that this was LG's answer to the
longevity problem. He said that by not pushing the RGB pixels so hard, for
bright whites, the lifespan could be extended, and the whites could be made
brighter at the same time.
Sounded plausible to me. Although, no actual numbers given. He said the
original OLEDs had lifespans in the few thousand hour range.
But this gives a funny positioning of the information, also depending
on the color saturation, something for which ClearView cannot
compensate. Small text looks jagged. TVs are not required to display
small text, monitors are. ClearView is a form of sub-pixel sampling.
Drs Klompenhouwer and van Heesch have written extensively about this
in their PhD thesis'. There IS gain to be had from proper sampling,
but not after the signal has already been sampled for another
resolution. Judging the quality of the Nyquist frequency (0,1,0,1,..)
is nonsense, this is what your reference seems to be doing. Properly
anti-aliased content looks okay at any (re-sampled) resolution, but
this is something that TVs are supposed to be good at, not monitors.
"Fuzzy" is not appreciated up close.
True enough, on fuzzy up close. Aside from the issue you describe if your
TV-used-as-monitor is RGBW OLED, even the article posted by Monty mentions that
way up close, the image on an HDTV won't be so good. That's also my experience,
although sometimes I do get up close, to make out the smaller details better.
I'd say that at normal viewing distance and even half that distance, using the
(normal RGB pixel) HDTV as monitor is more than fine. Just don't expect a 42"
HDTV to do what a proper 42" PC monitor might be expected to do, when you're at
arm's length to the screen!
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