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Display Calibration Light Illusion Forums / Display Calibration /  
 

How to match OLED and LCD

 
Author SiyoungCha
ZRO
Male
#1 | Posted: 19 Dec 2022 16:43 
First of all, I am not good at English.
I would be grateful if you could understand my situation.

I'm preparing for a small color suite room to work as a colorist
My system configuration is like this,

Monitor : Eizo CG279X
Client Monitor : LG C1
BMD Decklink mini monitor 4K
BMD Bidictional Converter 12G

CG279X is connected via Decklink HDMI output
LG C1 is connected via 12G converter that Received the signal output from deck link to sdi

I used calman, but I was not satisfied and bought the LS lte a while ago.
I want to match the two display, but I'm struggling
Can i get some help?

I read an article about Perceptual Colour Matching and I perceptually matched the white points of the two displays according to the guide.
But, The two display still don't match in the dark side, probably because the black levels don't match?
Should I set the black level as well?
If so, How can I do that in LS?

And when calibrating LG,
I set the EOTF to 2.4 and it didn't seem right.
So I set it to BT1886 and it seemed correct.
Is it correct to set the OLED to BT1886? (Why Calman says to set OLED to purepower 2.4...)

I am a beginner in calibration.
Sorry for so many questions.
I would be very grateful if someone could help me.

Author Steve

INF
Male
#2 | Posted: 19 Dec 2022 23:25 
I would lift the black level of the WOLED to be similar to the LCD.

Also, you may need to use an approach that reduces the gamut near black on the WOLED.
See: https://www.lightillusion.com/advanced_operation.html#oled

You can use the LUT Image to do the same as the LUT Manipulation Tools, via something like Photoshop.
https://www.lightillusion.com/lut_image_guide.html

If you still have issues, please ask more questions.

Steve
Steve Shaw
Mob Boss at Light Illusion

Author ConnecTED
LTE
#3 | Posted: 20 Dec 2022 18:09 
The BMD Decklink Mini Monitor 4K has 12G HDMI and 6G SDI.

Your EIZO is 1080p; your LG is 2160p.

It's better to use a direct HDMI to your LG, to have 2160p output if required and the SDI to the EIZO.

If you use RGB signal, the 6G SDI can send 1080p.

If you use YCbCr, the 6G SDI can send 2160p, and the Bi-converter can do automatic downscale the 2160p to 1080p for your EIZO (it works with HDMI to HDMI, I haven't tested if it will work with SDI to HDMI).

Use the EIZO as a reference to create a custom white point for your LG.

Author SiyoungCha
ZRO
Male
#4 | Posted: 26 Dec 2022 08:34 
Steve
Hi Steve,

thank you for replying
Would it be all right if I ask you a few more question?

Which of the methods of raising the black level is correct?

I used the limit luminance of the LUT tool,
but There was crushing on the darkside side.
Perhaps there was something wrong with the profiling setup.

So, I adjusted the black level by adjusting the brightness of the display OSD menu.
This method is not easy to set the black level accurately.
I had to activate the 'extended' among the black level options of the display.
Could this be a problem?

And..
When the LUT was activated in LS, the De value was good. average less than 1.
But when I uploaded to LG C1, the result came out differently. The average De value was 1.5.

What could be the problem?

I profiled using Resolve's TPG.
The patch scale was set to full.
According to the guide, it was said that LG TV should be set in the legal or extended range.
The LG C1 with 16 black output did not look black.
For this reason, I set it to full range.
When the LUT was applied, there seemed to be no problem with the level.

I'm a beginner so everything is confusing.
Thank you for your kind reply.

Author SiyoungCha
ZRO
Male
#5 | Posted: 26 Dec 2022 08:35 
ConnecTED

Hi Ted,

Thank you so much for your good info
I modified the connect according to your information.
Unfortunately, on Resolve 2160 output, Eizo only seems to accept YCbCr signals.
I'll have to do some more testing.

I don't know if you remember, but you helped me before
I say thank you again.

Author SiyoungCha
ZRO
Male
#6 | Posted: 17 Jan 2023 04:32 
I learned information that the OSD brightness and contrast are processed inside the LG TV before applying the LUT.
For me, raising the black level via the brightness or contrast controls in the display OSD was not a solution.
After applying the LUT, it was confirmed that the black level was lowered again.

I learned about custom parametric OETF through a LS's guide.
I matched the black level of the LCD via a custom parametric OETF.
This doesn't seem to lift the 0% blacks of the actual display.
However, the level near black was raised, which seemed to match the black level of my LCD.

I don't know if this is the correct way.
But for me it worked very well.

Author ConnecTED
LTE
#7 | Posted: 17 Jan 2023 11:41 
Hi,

Profile both displays with 3D LUT with REC.709 gamma 2.4, and lift the black level of the OLED using the Limit Luma @ LUT Tools window.

Author SiyoungCha
ZRO
Male
#8 | Posted: 18 Jan 2023 11:39 
Hi, Ted
Thank you for always helping me

I tried the method of using the LUT tool's Limit Luma at first.
However, cliping occurred in near black, so I did not continue to use this method.

I got a hint from your website regarding the calibration of the LG TV.
And, I adjusted the brightness on my LG TV and bypassed 1D LUT.
And I tried the method of using the Limit Luma of the LUT tool you gave me. It worked very effectively.

Besides the problem of black level and white point,
I didn't solve the problem of skin tones looking a little redder on OLED.

LG TV is tricky to calibrate than Eizo

I'll have to do some more testing.

Many thanks.

Author ConnecTED
LTE
#9 | Posted: 19 Jan 2023 18:11 
Use the recommended profiling method for the LG OLEDs. (follow LG Guide).

Use the EIZO as a reference, and create a new colorspace with a custom white point for the LG that will visually match EIZO's white.

Pre-calibrate LG using that new custom white point, and profile and generate the LUT using the new custom colorspace with a modified white point.

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 How to match OLED and LCD

 

 
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