OLED TVs: Technology Advancements Thread - Page 529 - AVS Forum | Home Theater Discussions And Reviews
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post #15841 of 15882 Old 05-19-2019, 07:38 PM
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All these talks about oled being bright enough, but what’s more bothersome to me is how oled cannot display bright colors. I play Uncharted 4 today on my c7 versus x900f. When i throw a grenade and it explodes, on the c7 the explosion is mute and has a very pink-ish color, while on the x900f it’s a mixture of bright red and yellow and looks realistic.
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post #15842 of 15882 Old 05-19-2019, 08:35 PM
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Quote:
Originally Posted by Duc Vu View Post
All these talks about oled being bright enough, but what’s more bothersome to me is how oled cannot display bright colors. I play Uncharted 4 today on my c7 versus x900f. When i throw a grenade and it explodes, on the c7 the explosion is mute and has a very pink-ish color, while on the x900f it’s a mixture of bright red and yellow and looks realistic.
https://www.rtings.com/tv/tools/comp...&threshold=0.1

C7 has equal color volume.

I'd suggest starting a thread on the general OLED board with some comparison photos.
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post #15843 of 15882 Old 05-19-2019, 08:47 PM
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Quote:
Originally Posted by stl8k View Post
Quote:
Originally Posted by Duc Vu View Post
All these talks about oled being bright enough, but what’s more bothersome to me is how oled cannot display bright colors. I play Uncharted 4 today on my c7 versus x900f. When i throw a grenade and it explodes, on the c7 the explosion is mute and has a very pink-ish color, while on the x900f it’s a mixture of bright red and yellow and looks realistic.
https://www.rtings.com/tv/tools/comp...&threshold=0.1

C7 has equal color volume.

I'd suggest starting a thread on the general OLED board with some comparison photos.
Possibly because oled can display dark colors better, while the x900f can display bright colors better. As mentioned in their separate reviews:
- The Sony X900F's local dimming does a good job of extending its wide color gamut down to a range of different brightness, so darker colors will look as saturated as brighter colors.
- This OLED TV is able to show its wide color gamut for dark and moderately bright colors, but it is unable to show extremely bright colors at their proper brightness.
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post #15844 of 15882 Old 05-19-2019, 09:13 PM
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Quote:
Originally Posted by Duc Vu View Post
Possibly because oled can display dark colors better, while the x900f can display bright colors better. As mentioned in their separate reviews:
- The Sony X900F's local dimming does a good job of extending its wide color gamut down to a range of different brightness, so darker colors will look as saturated as brighter colors.
- This OLED TV is able to show its wide color gamut for dark and moderately bright colors, but it is unable to show extremely bright colors at their proper brightness.
Yes, as depicted visually here by Sony:

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post #15845 of 15882 Old 05-22-2019, 06:18 PM
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Guangzhou Ramp Up

Where do you think these earliest panels from Guangzhou are destined? Exclusive to certain consumer brands? For use in TVs sold in China?

I imagine that if you took flights from Guangzhou↔Seoul on Fri through Mon you'd find a fair number of LGD engineers on those flights.

http://english.etnews.com/20190522200002
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post #15846 of 15882 Old 05-22-2019, 07:48 PM
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Originally Posted by stl8k View Post
Where do you think these earliest panels from Guangzhou are destined? Exclusive to certain consumer brands? For use in TVs sold in China?

I imagine that if you took flights from Guangzhou↔Seoul on Fri through Mon you'd find a fair number of LGD engineers on those flights.

http://english.etnews.com/20190522200002

I have no idea where they might be headed but what I find interesting is that the plant is on schedule even with the current economic volatility. Here's a post from July 2018, https://www.avsforum.com/forum/40-ol...l#post56468498. The schedule seems to be on target.


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post #15847 of 15882 Old 05-24-2019, 11:15 AM
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Still no indication as to whther it's WOLED or RGB-OLED: https://www.oled-info.com/lgd-confir...-oled-supplier

"We speculated that LGD is the display supplier, and yesterday LGD's CTO confirmed this."
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post #15848 of 15882 Old 05-25-2019, 09:31 AM
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LGD provided some onfo on their WOLED stack roadmap at SID 2019 last week: http://olednet.com/sid-2019-blue-tad...rescence-oled/

Looks like the first step will be an increase in color gamut by replacing yellow with green (probably next year) and the next step will be a 30% increase in peak brightness coming from the move from florescent blue to TADF blue (2021 or 2022).
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post #15849 of 15882 Old 05-25-2019, 10:08 AM
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Originally Posted by fafrd View Post
LGD provided some onfo on their WOLED stack roadmap at SID 2019 last week: http://olednet.com/sid-2019-blue-tad...rescence-oled/

Looks like the first step will be an increase in color gamut by replacing yellow with green (probably next year) and the next step will be a 30% increase in peak brightness coming from the move from florescent blue to TADF blue (2021 or 2022).
In the same article on SID'19, Cynora presented results indicating that they had doubled lifetime of their Blue TADF since March (for a modest hit in efficiency):
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post #15850 of 15882 Old 05-25-2019, 04:12 PM
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I'm confused. From this information it looks like LG plans to move to a blue that is 1/10 the lifetime of the current blue in 2021. What am I not getting?


Thanks for all the great research and explanations you give, BTW fafrd.

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post #15851 of 15882 Old 05-25-2019, 07:28 PM
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Originally Posted by sooke View Post
I'm confused. From this information it looks like LG plans to move to a blue that is 1/10 the lifetime of the current blue in 2021. What am I not getting?


Thanks for all the great research and explanations you give, BTW fafrd.
What data do you have on the lifetime of LG's current florescent blue emitter? The only thing we know is that blue is the only color that does not give LG issues with burn-in, so florescent blue is probably longer lifetime than it needs to be (at least relative to red, as aged by real-world content).

It's important to compare apples to apples, so LT97 versus LT95 or LT50 and also 1000cd/m2 versus 1200cd/m2.

Also, given the progress in TADF lifetime demonstrated between March and May, it's also possible that LGD is banking on a similar rate of improvements over the next 12-18 months (meaning 4-6X better before they launch)..,
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post #15852 of 15882 Old 05-26-2019, 07:00 AM
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Aahh, ok. I thought the hyperflourescent blue lifetime data was for what LG was using now (or was typical for the state of the art and so LG's blue would be similar).


LT95 means... time to 95% light output?

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post #15853 of 15882 Old 05-26-2019, 08:29 AM
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LT95 means... time to 95% light output?
Yup, LT95 = brightness drops 5% in ...... hours - LifeTime.

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post #15854 of 15882 Old 05-26-2019, 09:38 AM
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True RGB oled laptop from Samsung. The guy in the video is saying it looks better than any WRGB tvs.

https://youtu.be/eHXvSGa60bE
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post #15855 of 15882 Old 05-26-2019, 10:33 AM
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Originally Posted by garbage98 View Post
Sort interruption about the ongoing discussion of motion resolution. Has anyone spotted the 2019 77 inch panels in the wild yet? I am wondering if these panels have got an upgrade this year or are we still sticking to the 2017 technology as we did last year?
A 2019 77" (LG) owner posted macro shots. My analysis is that we're going to see different pixel structures at all 3 panel size classes going forward.

https://www.avsforum.com/forum/40-ol...l#post58100924

If you're on the fence, I'd wait for a 77" review especially by someone who has also reviewed one of the other 2 panel size classes. In the mean time, negotiate a great price on it. Anecdotes from the Pricing thread suggests there lots of room to negotiate.
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post #15856 of 15882 Old 05-26-2019, 12:46 PM
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Originally Posted by stl8k View Post
A 2019 77" (LG) owner posted macro shots. My analysis is that we're going to see different pixel structures at all 3 panel size classes going forward.

https://www.avsforum.com/forum/40-ol...l#post58100924

If you're on the fence, I'd wait for a 77" review especially by someone who has also reviewed one of the other 2 panel size classes. In the mean time, negotiate a great price on it. Anecdotes from the Pricing thread suggests there lots of room to negotiate.
You linked to the wrong post: https://www.avsforum.com/forum/40-ol...l#post58097522

And I'm not sure you've reached the correct conclusion - the 77C9 pixel looks very much like the 65C9 pixel - certainly much, much less 'different' than the C9 vetsus C8 or C9 versus C7 or C8 versus C7...
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post #15857 of 15882 Old 05-26-2019, 06:34 PM
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Originally Posted by fafrd View Post
You linked to the wrong post: https://www.avsforum.com/forum/40-ol...l#post58097522

And I'm not sure you've reached the correct conclusion - the 77C9 pixel looks very much like the 65C9 pixel - certainly much, much less 'different' than the C9 vetsus C8 or C9 versus C7 or C8 versus C7...
I posted an update in that thread...

Quote:
I misremembered the discussion on the OLED Technology Advancements Thread about pixel structure. There were some differing perspectives, but I think the conclusion was that there is no pixel shape differences between 55" and 65" in 2018. (I assume that there continues to be no distinction between those panel size classes in 2019).

So, you very well could be right that they're the same. I definitely see shapes reminiscent of the 2018 77" in your shots. Better macro shots like the one flatpanelshd captured of the Sony 65" AF8 <https://www.flatpanelshd.com/pictures/Sony_AF8_pixels.jpg> would make it definitive.

Regardless, if the 2019 77" performs near how the 65" does, I don't think anyone will care what the pixel structure is. Looking forward to seeing the 1st technical review of the 77".
And, my advice to anyone trying to decide between the 2019 77" and 65" is to wait for a technical review of the 77" and see if any of the technical measure differences, if any, dissuade you from the 77".
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post #15858 of 15882 Old 06-03-2019, 06:08 AM
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@fafrd you were right, in 2020 we will have a 48-inch 4K OLED TV!

Quote:
LG Display will start production of smaller 48-inch 4K OLED TV panels next year, the display maker's vice president has confirmed to China Business News.
https://www.flatpanelshd.com/news.ph...&id=1559553128
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post #15859 of 15882 Old 06-03-2019, 01:19 PM
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Apple's Display Innovations

https://www.apple.com/pro-display-xdr/

Apple raised the bar with its announcement of a pro-level display based on non-emissive tech. Lots of focus on HDR, color, viewing angle, and form (the stand is $1K!).

Apple needs to deliver on these announcements, but as I said elsewhere, if they do, this feels like a product that's going to catalyze lots of competition and innovation in both displays and imaging (where it creates pull for the capture of higher-quality imagery).

Will be interesting to hear more about the product and perhaps someone will do some informal testing/characterization of the displays being shown at Apple's conference.
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post #15860 of 15882 Old 06-03-2019, 02:29 PM
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Quote:
Originally Posted by stl8k View Post
https://www.apple.com/pro-display-xdr/

Apple raised the bar with its announcement of a pro-level display based on non-emissive tech. Lots of focus on HDR, color, viewing angle, and form (the stand is $1K!).

Apple needs to deliver on these announcements, but as I said elsewhere, if they do, this feels like a product that's going to catalyze lots of competition and innovation in both displays and imaging (where it creates pull for the capture of higher-quality imagery).

Will be interesting to hear more about the product and perhaps someone will do some informal testing/characterization of the displays being shown at Apple's conference.
This uses mini LED right? Even if it does, I'm not sure what it does better than OLED other than peak nits and a bit higher resolution. Especially with 48" OLEDs coming next year which will cost a fraction of this Apple monitor.

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post #15861 of 15882 Old 06-03-2019, 02:31 PM
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Originally Posted by Micolash View Post
This uses mini LED right? Even if it does, I'm not sure what it does better than OLED other than peak nits and a bit higher resolution. Especially with 48" OLEDs coming next year which will cost a fraction of this Apple monitor.
For lots of the work that is done on monitors, an OLED won't work due to burn-in risk. You are talking static display elements with >50% on-screen time. Apple's display is also >4K, which matters for some uses.

That said, a 48-inch OLED for $1200 is going to make a pretty amazing monitor for some users here (and of course elsewhere). And I look forward to those arrivals in 2020.
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post #15862 of 15882 Old 06-03-2019, 05:50 PM
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Apples $4500 XDR display is LCD I believe.

Sustained 1000 nits and supposed some wide gamut compliance.
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post #15863 of 15882 Old 06-03-2019, 11:03 PM
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Quote:
Originally Posted by stl8k View Post
https://www.apple.com/pro-display-xdr/

Apple raised the bar with its announcement of a pro-level display based on non-emissive tech. Lots of focus on HDR, color, viewing angle, and form (the stand is $1K!).

Apple needs to deliver on these announcements, but as I said elsewhere, if they do, this feels like a product that's going to catalyze lots of competition and innovation in both displays and imaging (where it creates pull for the capture of higher-quality imagery).

Will be interesting to hear more about the product and perhaps someone will do some informal testing/characterization of the displays being shown at Apple's conference.
This thing is still just going to be another FALD IPS display that can't break 3000:1 ANSI contrast.

It will be nice im sure, but you'll be paying a fat premium just for the "Apple" logo. If the price of their stand or VESA mount doesn't explain this clearly, then I don't know what else will.
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post #15864 of 15882 Old 06-04-2019, 07:45 AM
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Originally Posted by stl8k View Post
@fafrd

I think I have this...

When LG and LGD communicate MPRT (via public marketing not scientific journals), it's an average MPRT (across all GTGs) as seen in this PDF:

https://www.lg.com/global/business/d...es/id/OLED.pdf

So, assuming that the current 65" UHD consumer OLEDs have MPRT(Avg) = 6. They'll be showing a panel with 42% improvement in that motion metric.
The genesis of the 3.5 MPRT value that LGD was touting can be seen in this technical paper from SID '19:

https://rdcu.be/bFAfI (links to Wiley.com)

Things we now know:

- The 3.5 MPRT (at 50% duty) is a consequence of the black data insertion (BDI) feature
- The MPRT is an average of all the gray to grays and the 0% duty value of 6.6 is close to what LGD marketing was communicating prior to the LGD announcement.
- There's a pronounced non-linearity in the lower duty levels (from 0 to 10% duty)

Another thing that doesn't get talked enough about is how OLED sensing/compensation constrains the engineering design space for improvements like this.

Reading this, is the reason for LGD pulling the end-user configurability of the BDI clearer? @Mark Rejhon

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Color Motion Quality

Technical Paper from LGD Introducing a New Notion of Color MPRT

An early attempt by LGD to measure motion blurs when transitioning between colors:

Quote:
For the 60hz LCD... When the start colors are white and cyan and the end colors are
gray 3.5 and red, the values of the color MPRT are 26.2, 24.9,
25.7 and 25.1 ms respectively. The motion blur of those colors
appears large than other colors. In the achromatic colors it
means the blur occurs long when changing from bright gray to
any color and from any color to dark gray. In the chromatic
colors it also means the blur occurs long when changing from
cyan to any color and from any color to red. Conversely we can
show short blurs when the start colors are red, dark skin and the
end colors are white, Cyan and yellow; each value is 21.2, 21.4,
18.4, 19.8 and 19.8 ms.
https://rdcu.be/bFAr4 (links to wiley.com)
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post #15866 of 15882 Old 06-04-2019, 10:11 AM
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Quote:
Originally Posted by stl8k View Post
Technical Paper from LGD Introducing a New Notion of Color MPRT

An early attempt by LGD to measure motion blurs when transitioning between colors:



https://rdcu.be/bFAr4 (links to wiley.com)
Would love to read the full paper (but don't have access).

In the meantime, I have to admit I am pretty confused by LG's use of the term MPRT - it almost seems as if they are using MPRT to mean GTG.

As you can see here, Motion Picture Response time is the same as persistance - the minimum time a pixel is outputting a given luminance level (within some % of target level): https://www.blurbusters.com/gtg-vers...ixel-response/

"MPRT is limited by refresh cycle duration, and by frametime."

For measuring a time 'between colors', GtG has a clear meaning (the time lag between initiating a change from any specific initial color to achieving target color withing whatever % specified).

But I'm not sure what it means to measure MPRT between colors. MPRT is determined by refresh cycle, so if you have a backplane supporting BFI (meaning an Effective Refresh Rate at least 2X the Native Refresh Rate, MPRT from any starting color to any new color should be the same as MPRT from any starting color to black, meaning 1/2 the Native Refresh Rate (assuming 2X Effective Refresh Rate).

As far as the comparison with LCD, of course if comparing to vanilla LCD without scanning bscklight (and hence no BFI), GtG is going to be far worse than OLED, is going to vary color-by-color and transition-by-transition, and any measurement of 'MPRT' is going to be much longer because it will be measured at Native Refresh Rate (since there is no BFI).

If the LCD had a basic scanning backlight allowing it to support the same Effective Refresh Rate as the OLED, it would be able to deliver similar uniform levels of MPRT from any starting color to any target color.

So again, I'd like to read the full papers LGD has published, but this 'Perfect Clear Motion' slide (4) they have presented strikes me as BS: https://www.lg.com/global/business/d...es/id/OLED.pdf

Among other things, some greyscale-to-greyscale 'MPRTs' are smaller/missing (for example, where are the last two G191/purple measurements?) and this lowers the average, suggesting it is better that some greyscale-to-greyscale transitions took longer to reach target levels (and hence persisted for less time once BFI'd to black).

'Flagship LCD' implies it has a scanning backlight, but BFI cannot have been activated when those Flagship LCD results were measured.

Need to give LG credit for finally focusing on motion performance but I have to admit that my initial reaction at seeing this slide is that they must have hired a Marketer from Samsung's marketing department.

Would love to learn more about the 'pronounced nonlinearity in the lower duty levels (0% to 10% duty)' if there is any easy way you can share more details.

If you look at the '0% to 20%' GtG measurement frim the attached Rtings.com WOLED measurement (upper left) you see a GtG transition time of 8.7ms (compared to all other transitions times of ~0.3ms). Since MPRT is reduced by increased GtG (the point I was making earlier about how nonsensical this greyscale-to-greyscale MPRT measurement is), not reaching target for a full internal refresh cycle means that MPRT will measure 0ms which will result in 'missing' columns and will lower the average (implying this is a good thing when actually it is not).

The difficulty LG is having with 0-10% transitions is consistent with the rtings.com excessive 0-20% GtG measurements, the 'missing columns' of LGs mysterious MPRT data and the challanges LG has been having with near-black lineraity and overshoots)...
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post #15867 of 15882 Old 06-04-2019, 02:21 PM
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Originally Posted by fafrd View Post
Would love to read the full paper (but don't have access).

In the meantime, I have to admit I am pretty confused by LG's use of the term MPRT - it almost seems as if they are using MPRT to mean GTG.

As you can see here, Motion Picture Response time is the same as persistance - the minimum time a pixel is outputting a given luminance level (within some % of target level): https://www.blurbusters.com/gtg-vers...ixel-response/

"MPRT is limited by refresh cycle duration, and by frametime."

For measuring a time 'between colors', GtG has a clear meaning (the time lag between initiating a change from any specific initial color to achieving target color withing whatever % specified).

But I'm not sure what it means to measure MPRT between colors. MPRT is determined by refresh cycle, so if you have a backplane supporting BFI (meaning an Effective Refresh Rate at least 2X the Native Refresh Rate, MPRT from any starting color to any new color should be the same as MPRT from any starting color to black, meaning 1/2 the Native Refresh Rate (assuming 2X Effective Refresh Rate).

As far as the comparison with LCD, of course if comparing to vanilla LCD without scanning bscklight (and hence no BFI), GtG is going to be far worse than OLED, is going to vary color-by-color and transition-by-transition, and any measurement of 'MPRT' is going to be much longer because it will be measured at Native Refresh Rate (since there is no BFI).

If the LCD had a basic scanning backlight allowing it to support the same Effective Refresh Rate as the OLED, it would be able to deliver similar uniform levels of MPRT from any starting color to any target color.

So again, I'd like to read the full papers LGD has published, but this 'Perfect Clear Motion' slide (4) they have presented strikes me as BS: https://www.lg.com/global/business/d...es/id/OLED.pdf

Among other things, some greyscale-to-greyscale 'MPRTs' are smaller/missing (for example, where are the last two G191/purple measurements?) and this lowers the average, suggesting it is better that some greyscale-to-greyscale transitions took longer to reach target levels (and hence persisted for less time once BFI'd to black).

'Flagship LCD' implies it has a scanning backlight, but BFI cannot have been activated when those Flagship LCD results were measured.

Need to give LG credit for finally focusing on motion performance but I have to admit that my initial reaction at seeing this slide is that they must have hired a Marketer from Samsung's marketing department.

Would love to learn more about the 'pronounced nonlinearity in the lower duty levels (0% to 10% duty)' if there is any easy way you can share more details.

If you look at the '0% to 20%' GtG measurement frim the attached Rtings.com WOLED measurement (upper left) you see a GtG transition time of 8.7ms (compared to all other transitions times of ~0.3ms). Since MPRT is reduced by increased GtG (the point I was making earlier about how nonsensical this greyscale-to-greyscale MPRT measurement is), not reaching target for a full internal refresh cycle means that MPRT will measure 0ms which will result in 'missing' columns and will lower the average (implying this is a good thing when actually it is not).

The difficulty LG is having with 0-10% transitions is consistent with the rtings.com excessive 0-20% GtG measurements, the 'missing columns' of LGs mysterious MPRT data and the challanges LG has been having with near-black lineraity and overshoots)...
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post #15868 of 15882 Old 06-10-2019, 11:38 AM
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Article confirming Samsung's decision to delay QD-OLED program by at lleast 3-6 months: http://www.thelec.kr/news/articleView.html?idxno=1892

Via google translate:

"Samsung Display is experiencing difficulties in developing large-size OLED for next-generation TVs.

An official in the display industry said, "Samsung Display has not been able to accurately capture the production concept," he said. Samsung Display reported that it had delayed the request for deposition equipment to the first quarter of the next year from the fourth quarter of this year. Organic deposition equipment to be used in the large-sized OLED production line of Samsung Display is to be supplied by Japan's Canon Torque.

Samsung Electronics' video display (VD) division launched OLED TVs with red, green and blue (RGB) emission in 2013. After that, Samsung Electronics folded its large OLED business. The next-generation large OLED for TVs developed by Samsung Display is known as the blue (B) emission method. In RGB subpixel configuration, red and green use quantum dot (QD) photoluminescence (PL) and blue uses organic luminescence as is.

One of the major issues in the technology, called QD-OLED, is the 'blue overkill'. QD light emission is a phenomenon in which blue light is emitted between particles and particles by hitting the quantum dot in a color filter with blue light. Quantum dot is used to increase the color purity, but the problem of color mixing appears.

Samsung Display plans to switch some of its LCD production lines from its L8 factory in Asan City, Chungcheongnam-do to a large OLED line for TVs. In the industry, this is called the 'C project'. C project implementation was originally scheduled for the third quarter of this year. However, due to the delayed arrival of deposition equipment, which is the core equipment for large OLED production lines, the implementation of the C project is expected to start at the end of this year.

Samsung Display's next-generation large OLED TVs are a group-wide move strategy. Lee Jae-yong, vice chairman of Samsung Electronics, was reported to have received in-depth reports from executives such as Lee Dong-hoon, CEO of Samsung Display at the end of last year, on the theme of "next-generation product development and investment strategy." The industry analysis shows that Samsung Display is sensitive to the recent news that it has suffered difficulties in the development of new OLED technology and management indicators.

In addition to mass production technology, marketing points are also a challenge for Samsung Display. Unless it is the RGB emission method, it is difficult to distinguish LG Display from its competitor, white (W) OLED. The currently known QD-OLED concept is not significantly different from the light emitting structure of LG Display WOLED in that it emits light with organic materials and filters light through a color filter. Samsung's VD division has said in recent years that OLEDs are not suitable for TV because of the burn-in phenomenon. The burning phenomenon caused by the lifetime of the organic material (especially blue) can not be avoided as long as the blue organic material is used."


So to translate the translation:

QDCC is not perfect and allows some blue photons to escape unconverted (the 'color-mixing' problem).

The proposed solution by Samsung Display is to add color filters to block the otherwise-escaping blue photons.

This solves the technical issue but then the Samsung Visual Display folks (who would rather see the Samsung Group invest in scaling up MicroLED) push back with the 'marketing point' that if Samsung uses color filters for QD-BOLED, they won't be able to distinguish it from LG's White-OLED+Color-Filter-based WOLED.

Oh, and in case that argument is not sufficient on its own, the Samsung Visual Display guys are arguing that they also can't use OLED for TV until Samsung Display has developed blue OLED material that does not suffer from burn-in...

'You say you can get rid of the color filters and solve the problem of blue burn-in? That sounds great - we'll check back in with in with you in another three months (and meanwhile, we've put all QD-BOLED pilot line investments on hold).'
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post #15869 of 15882 Old 06-11-2019, 04:07 PM
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New fab utilization report from DSCC: https://www.displaysupplychain.com/b...vering-in-june

OLED TV (meaning LGD WOLED) has been running flat-out at 100% utilization since May 2018!

No wonder LGD had to tell Vizio 'no, not 'til next year' .

Seriously, all the earlier talk about WOLED losing market share is nonsense when in a situation like this. Perhaps LGD has lost potential market share over the past year, since if they'd been able to produce more WOLED panels they likely would have been able to capture additional market share, but they have not really lost anything when they are able to sell everything they can produce (and at higher prices to boot).
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post #15870 of 15882 Old 06-11-2019, 05:31 PM
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Another potential mechanism to deliver higher-efficiency OLEDs: https://www.photonics.com/Articles/S...er_OLED/a64795

"Typically, the excitons in OLEDs occur in two patterns, triplets and singlets. Singlets need more energy, and although they can be converted into triplets, additional energy is required to create them in the first place. The researchers found a way to lower the voltage in OLEDs so that only triplets are formed."

Current-generation OLEDs (both RGB-OLED and WOLED) largely rely on florescent blue emitters because phosphoescent blue emitters with acceptable lifetime have remained elusive.

Because the florescent blue emitters only convert singlets to photons, triplets and the energy that went into creating them is wasted, hence the reason that (florescent) blue OLED is much lower efficiency than (phosphorescent) red and green OLEDs (which convert triplets to photons).

Only 25% of the energy put into OLEDs is converted to singlets, the other 75% going into generating triplets. Hnce the reason why florescent OLED emitters are generally ~1/3 the electro-optical efficiency of phosphorescent OLED emitters.

Thermally Activated Delayed Forescence (TADF) is an alternative approach than converts those 75% triplets back to singlets for florescent emission, but acceptable lifetimes have proven elusive (always 'next year').

Only generating singlets woud have huge implications for OLED efficiency and lifetime.

Today's florescent blue would go from being ~1/3rd the electro-optical efficiency of phosphorescent red and green to being ~133% the efficiency of those phosphorescent emitters (~400% the efficiency of florescent blue without the lifetime issues of TADF).

It's also possible that the same singlet-only solution would allow florescent red and green to be used rather than phosphorescent, meaning 133% the efficiency of today's phosphorescent red and green.

With florescent blue beng 4 times as efficient as it is today, LGD's current B/R-Y/B WOLED stack would not need dual blue OLED layers any more and they could probably go to a the simple G/R-B stack which they have already shown on their roadmap with TADF Blue for 'Future' (attached).

Just replacing the TADF Blue with this singlet-only Floresecent solution would deliver the +30% electro-optical efficiency increase LGD is already touting for the 'Future' of WOLED, but if green and red were also converted to singlet-only florescence, the resulting efficiency increase could be closer to +75%.

There is no question that OLED has the technology roadmap before it to catch up to LED/LCD in the Brightness Wars (a question of when, not if).
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