Calibrating AMOLED Displays

[Raikkon35]

Hi,

I’m trying to use DisplayCAL to calibrate the AMOLED display of my Nexus 6P smartphone. What values do I need to set in order to do that?

In Mode, “LCD (generic)” or “Refresh (generic)”?

In Correction appears one OLED mode, but it’s for LED OLED created with primaries R, G, B, White. The AMOLED displays by Samsung use a RGBG Pentile matrix (in comparison, double green subpixel and no white). I’m using Auto correction mode, but what do you think?

Thank you very much and kind regards.

[Raikkon35]

I made a “Tools > Report on uncalibrated screen” with different modes. Those are made each two times, the second report were very similar to the first. You can see the difference between the modes tested.

Auto (None)
23:36:28,779 White Correlated Color Temperature = 6398K, DE 2K to locus = 7.3
23:36:28,786 White Correlated Daylight Temperature = 6399K, DE 2K to locus = 3.3
23:36:28,788 White Visual Color Temperature = 6144K, DE 2K to locus = 7.0
23:36:28,789 White Visual Daylight Temperature = 6294K, DE 2K to locus = 3.1

LED OLED
23:38:36,494 White Correlated Color Temperature = 6439K, DE 2K to locus = 6.5
23:38:36,496 White Correlated Daylight Temperature = 6440K, DE 2K to locus = 2.3
23:38:36,496 White Visual Color Temperature = 6211K, DE 2K to locus = 6.3
23:38:36,497 White Visual Daylight Temperature = 6367K, DE 2K to locus = 2.2

LCD White LED IPS
23:39:56,418 White Correlated Color Temperature = 6379K, DE 2K to locus = 6.8
23:39:56,420 White Correlated Daylight Temperature = 6380K, DE 2K to locus = 2.7
23:39:56,420 White Visual Color Temperature = 6144K, DE 2K to locus = 6.6
23:39:56,421 White Visual Daylight Temperature = 6296K, DE 2K to locus = 2.5

[Florian Höch]

Hi,

In Mode, “LCD (generic)” or “Refresh (generic)”?

OLEDs are similar to LCDs/TFTs in that they usually are of a non-refreshing type, so “LCD (generic)”.

In Correction appears one OLED mode, but it’s for LED OLED created with primaries R, G, B, White. The AMOLED displays by Samsung use a RGBG Pentile matrix (in comparison, double green subpixel and no white). I’m using Auto correction mode, but what do you think?

The LED OLED correction can probably be used, but without a spectrometer to determine how good of a match that is, it’s impossible to tell how well it will work. From the numbers above, at least the result using the OLED correction seems sane.

[Raikkon35]

Thank you for your response!

The numbers above are based in a previous calibration with CalMAN.

Unfortunately I don’t have a spectrophotometer. Yesterday I calibrated the white point with DisplayCal, and I got different values of RGB to match the two modes asked before (Auto and OLED). In the two modes I get the same red, but green is 4 values superior.
I’d like to know your opinion, sorry if I’m insistent about this.

For example, in 6500K (the maximum values are RGB 256 256 256)
Correction Auto (None): 238 238 256 (0.3 Delta E)
Correction OLED: 238 241 256 (0.3 Delta E)

In 7500K and 8500K the difference of values is similar.

What do you think with this information? Thank you very much, I appreciate a lot your assistance.

[Author]

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