LG OLED65C8PUA OLED Ultra HDTV Review Test Bench

Test Bench

The measurements here were made using CalMAN measurement software from Portrait Displays, together with Photo Research PR-650 and Klein K-10A color meters and a Murideo Fresco 6-G (UHD) pattern generator. The peak white levels given below were rounded here to the nearest foot-lambert/nit.



1080P HD/SDR
Post-calibration, with the 65C8’s peak white output set to 39.5 foot-lamberts (135 nits) in ISF Expert (Dark Room) Picture Mode with OLED Light at 45, Contrast at 85, and Brightness at 50, black level could not be measured. The image was effectively totally black, making full-on/full-off contrast ratio infinite, or, more practically speaking, unmeasurable.

I measured a 1080p HDMI input lag of 21ms in Game mode, increasing to 100ms in ISF Expert (Dark Room) mode.

In ISF Expert (Dark Room) Picture Mode, the pre-calibration grayscale Delta E values from 20% to 100% ranged from a low of 2.83 at 20% brightness to a high of 3.78 at 50% brightness. Post-calibration values ranged from a low of 0.35 at 20% to a high of 1.03 at 40%. Only the 2-step White Balance adjustments were needed to dial in the D65 white point. The BT.1886 gamma measured a low of 2.37 at 70% and a high of 2.40 at 80%. (Attempts to further fine-tune gamma using the luminance adjustments in the 20-step White Balance controls were not only unnecessary, but produced serious side effects, including obvious posterization.)

The pre-calibration SDR color Delta E values ranged from 0.96 in magenta to 3.04 in blue. Post- calibration, the minimum was 0.76 for blue and the maximum 1.42 for magenta.

(Delta E is a figure of merit that indicates how closely a display adheres to the color standard. Experts generally agree that at levels below 3-4 the result is visibly indistinguishable from perfect color tracking. Delta E may be used to characterize either white balance or color.)

Ultra HD/HDR10
Post-calibration, at the peak measured HDR light output of 635 nits (185 foot-lamberts) in Cinema (User) HDR Picture Mode with OLED Light at 100, Contrast at 100, Brightness at 50, and Dynamic Contrast on Low, black level could not be measured. This made the full-on/full-off contrast ratio, as above, essentially infinite.

A recent refinement in our HDR measurement technique resulted in a superb HDR technical performance from the LG 65C8. It followed the EOTF (gamma for HDR) almost perfectly. Pre-calibration, the grayscale Delta Es ranged from a low of 0.4 at 20% to a high of 5.1 at 70% with luminance included in the Delta E calculation. Post-calibration they maxed out at 2.7 at 70% with luminance, and 0.8% at 100% without luminance. Only the 2-step White Balance controls were used. Pre-calibration, the maximum color Delta E with luminance was 4.9 (green); post-calibration, it was 2.8 (red).

The HDR peak white levels with various-size 100% luminance windows measured (in nits) 440 at 2%, 605 at 5%, 630 at 10%, 350 at 25%, and 130 at 100%. Using the 1976 uv standard, the set measured 70.6% of BT.2020 and 95.4% of P3 color space. (No consumer UHD source material as yet exceeds P3 color space.)

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David Vaughn's picture
Tom, Great review as usual. I'd really like a 92" version of this TV for under $10k!
brenro's picture

I'd be happy if I could afford the 77".

davidbe's picture

LG did a great disservice by essentially perfecting 3D on the 2016 model and then dropping it. The 3D is stunningly beautiful on the E6 OLED but not present on the C7 or C8. I bought two E6 models so I don't have to give up my 3D collection if one of them gives up the ghost. I wish LG would bring 3D back. People who have not seen 3D on an E6 (or G6) just have no idea what they are missing.

brenro's picture

But it's not being supported for some reason. Even 3D movies in theaters are only 2K. For the foreseeable future 4K is in and 3D is out.

Bosshog7_2000's picture

In my opinion 3D was the most overrated 'feature' of the AV world in the last 10 years. I'm not alone...hence the lack of support here.

davidbe's picture

Have you ever seen 3D on a 2016 OLED? I totally agree with you that 3D was poorly implemented before that, which accounts for its demise. However, I think if LG has properly promoted 3D on its OLED, that 3D TV could well have made a comeback. If showrooms has shown off the stunningly beautiful 3D on these OLEDs, people would have wanted it. But LG never promoted their outstanding 3D and had a pricing policy that actively discouraged 3D by not putting 3D on the lower priced B6 flatscreen but only on the C6 curved screen, and then LG concluded that there was no demand for 3D because people rejected the curved screen (having never seen or heard how good the 3D was). I think this is a tragic loss to the world and that LG could have revived 3D and created a large demand for it if they had actively marketed it.

drny's picture

Yeah, I know the 2018 C8 has slight improvements over its predecessors.
These are incremental improvements, not substantial.
The only worthwhile substantial improvement regarding OLED's is the price drop compared to 2015 outrageous prices.
The C8 pricing is acceptable.
Yet, keep in mind that in April of this year you could purchase a 2017 65"B7 for $2,300.
You have to spend hours in a completely dark room to appreciate the subtle differences between a B7 and C8 models.
If the room has substantial ambient light, you could not determine which one is the better model if your life depended on it.
Now if a 77"C8 could be had for $5,000 then that would be a must buy.

billy.allen's picture

I wish your evaluation had included a test of the set's reset feature that is suppose to correct any image retention issue. For example, display a static image for some time period and then evaluate how much image retention occurred and whether it could be eliminated. I can't trust an untested system given the amount of static images that still show up frequently particularly when streaming music. I can't get myself to purchase a technology that makes me paranoid about ruining it every time I see a static image. Until I see your test results, I'm sticking with LCD TV's although I'd really like to purchase an OLED.

Bosshog7_2000's picture

Hey Billy. A quick note on image retention...
I bought a 65" LG C7 in Dec of last year. Like yourself I was super paranoid about static images and getting screen burn-in/image retention. I can tell you that I have had zero issues...
I play a PS4 and as you know there are lots of static images gaming and I've never had an issue. What I do get is amazing picture quality...it's literally the best TV I've ever owned.

That said I am careful with static images and I don't leave a show paused and just walk away from it for any great length of time. Also, on a side note it annoys me how I've only got a few 4K channels in my cable package and they all insist on having their logo plastered to the screen. So far, zero issues with image retention so i say go for it!

dave_block's picture

I love watching musicals and different Broadway performances and this TV must be a great option for this aim! I used to check the tour of musicals on https://dearevanhansenshow.com/tour/ but now I can see all the plays sitting on my sofa.