Eizo cs2420 uniformity

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  • #33062

    Gianluca.M.
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    Hello!
    A few days ago I bought an eizo cs2420. I did a calibration with the colornavigator 7 software using my i1Display Pro, without using the “Display uniformity equalizer” option. Then I decided to do a screen uniformity test with Displaycal. The report didn’t look very good to me, (some squares are orange and red).
    So, this time I decided to enable the “Display uniformity equalizer” option in CN7, and to do another calibration. After that I did the screen uniformity test again. now this report seems to be much better (all squares are now green ).
    Are the uniformity normal for this type of display, or is there a uniformity issue with my unit?
    I also noticed that by activating the “DUE” option I have a small loss of contrast (856: 1), also verified in displaycal. without “DUE” option the contrast was (1021: 1) is this normal?

    Thanks in advance.

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    #33069

    Vincent
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    CS models, including yours have an excellent color uniofrmity out of the box. Brightness uniformity may be not so good when DUE=brightness.

    You unit has a sub par brightness uniformity with DUE set to brightness (but color unifomity is excellent as expected), typical values are <15% brightness drops and yours go down to 20 in a band.
    If that brightness drop bothers you return to refund and try another unit.

    Report shows by default overall uniformity error dE, whioch can be splitted on color error/color tint (dC) and brightness error. Use central cell combo box to switch between total error and “color tint” error

    PS: Older CS2420 where GB-LED like your selection, newer CS2420 may be WLED PFS (HP Z24x). Without an spectrophotometer is hard to say what type is yours.
    Aim manually (RGB gains) to D65 using one CCSS then another. Keep the one that looks whiter if they are two dfferent.
    CN7 lacks of a proper WLED PFS correction (unless they hve updated it), it used a generic 3×3 for that moden and a generic i1d3 or GB_LED EDR/CCSS, depending oon CN7 configuration. To use WLED PFS EDR check Midas’ thread on CS2731, here in thsi forum.

    #33076

    Gianluca.M.
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    Thanks for the reply Vincent.
    So the value for brightness is just a little below average. This in itself might not be a problem, that band doesn’t bother me visually.
    My concern is that perhaps the problem may get worse over time. I think this can happen because all monitors have a progressive deterioration using it for a few years, at least I think so.
    I also don’t like the idea of having to use a patch like the “DUE” function to get around the uniformity problem. I think I will ask for a refund or replacement.

    Thanks also for the suggestion for the type of correction to use for the panel. I’ll check the Midas thread.

    #33077

    Vincent
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    -15% is expected even on an Eizo. DUE is useful if contrast does not matter, like when softproofing.

    If you want >1000:1 with due=uniformity then you need some of the newwer CG/CG-X (or the newer NEC PA271Q with the same panel & backlight) with 1500-1300:1 native contrast ratio. Even with DUE=uniformity they should keep >1000:1

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