Does OLED necessarily entail HDR?

[Aristotelian]

Hello everyone.

I have been reading in the press, LG comments that since its OLED displays have perfect colour reproduction, that HDR can be reproduced on its OLED displays without halos or anything else.

I see quotes like this in the press: "As you can see, the TV blends perfectly into its surroundings, and because each pixel on an OLED TV can create all colors there is no halo light around for example starts or bright objects, which is the case on LCD-TV with local dimming."

Source: http://www.flatpanelshd.com/review.php?subaction=showfull&id=1411378140#VmWzcZCo6GEIRhQ4.99

Which leads me to ask - does this mean that the only limitation on Dell's 4k, 120Hz OLED display is that - although it can display HDR at 120Hz, there is no available connection that can feed the bandwidth necessary for displaying 4k 120Hz HDR content?

The idea I have in my brain is - if OLED is automatically HDR, and OLED is so fast already, then the limitation we will see with 4k, 5k etc. and HDR will really be about the bandwidth in the connection types that are being developed. Perhaps there can be a 'dual link display port 1.3' that would resolve this - I don't know.

 

[x3sphere]

You can use multiple connectors to get around bandwidth limitations, that's what Dell did for its 5K@60Hz display on DP 1.2. I think the downside with this approach however is that VRR (G-Sync / FreeSync) won't work.

 

[Suijin]

If I remember right the only thing OLED was missing from the HDR game is brightness. This is because at least historically OLED had issues going to the same brightness as LCDs.

If you do some reading on OLED (especially LGs as they have the most out there as TVs) they do a auto-brightness limiter (ABL) to prevent pixels from getting too much burn in from being bright for a long time. Overall it is a big detriment to the overall quality of OLED. The plus side is it does so many other things much better than the other technologies.

 

[hawtdawg]

Halos don't have anything to do with color reproduction, they have to do with contrast ratio. OLED can't get super bright like an LCD. However, due to OLED having an extremely high (infinite even) contrast ratio, in a dark room environment, they can arguably do HDR better than any LCD could.

The halo's being talked about are from FALD on LCD. Being able to get super-bright is great and all, but LCD has some real limitations that make it less than ideal for HDR. There are a few sets out that are edge-lit local dimming with HDR, and they simply don't do HDR justice. FALD is better, but still has haloing issues. On PC, I'd wager that the first HDR panels we see will be VA panels, since they have decent native contrast. I don't honestly know how it will be pulled of on an IPS monitor. IPS monitors have bad contrast, and FALD would be too noticeable sitting that close to one, unless you had 1000's of dimming zones, which would make it more expensive than an OLED.

 

[x3sphere]

Halos and for the most-part, HDR don't have anything to do with color reproduction, they have to do with contrast ratio. OLED can't get super bright like an LCD. However, due to OLED having an extremely high (infinite even) contrast ratio, in a dark room environment, they can arguably due HDR better than any LCD could.

The halo's being talked about are from FALD on LCD. Being able to get super-bright is great and all, but LCD has some real limitations that make it less than ideal for HDR. There are a few sets out that are edge-lit local dimming with HDR, and they simply don't do HDR justice.

This is actually not true with modern OLEDs. The Galaxy S6 has the highest peak brightness recorded for a mobile display.

http://www.displaymate.com/Galaxy_S6_ShootOut_1.htm

When Automatic Brightness is turned On, the Galaxy S6 reaches an impressive 784 cd/m2 (nits) in High Ambient Light, where high Brightness is really needed – it is the brightest mobile display that we have ever tested. As a result of its high Brightness and low Reflectance, the Galaxy S6 has a Contrast Rating for High Ambient Light that ranges from 118 to170, also the highest that we have ever measured for any mobile display. See the Brightness and Contrast, the High Ambient Light and the Screen Reflections sections for measurements and details.

I'm also pretty sure that's higher than any of Samsung's current SUHD TVs. LG's current OLED TVs are lower (around 400 nits), but the newer ones go up to 600. Bottom line though, OLED can get very bright.

 

[hawtdawg]

This is actually not true with modern OLEDs. The Galaxy S6 has the highest peak brightness recorded for a mobile display.

http://www.displaymate.com/Galaxy_S6_ShootOut_1.htm



I'm also pretty sure that's higher than any of Samsung's current SUHD TVs. LG's current OLED TVs are lower (around 400 nits), but the newer ones go up to 600. Bottom line though, OLED can get very bright.

I meant super-bright like 4000 nits or whatever Sony was showing at CES with their Backlight Master Drive (much less 10,000 like the Dolby prototype.). OLED is certainly capable of getting bright, that's not really the question. right now at least, it's more a question of longevity/burn in.