Display Uniformity and Power Usage

Especially with localized dimming, the PG27UQ's panel uniformity was solid. In the default out-of-the-box configuration (FALD enabled), the maximum local difference of white levels is around 5% of the center brightness.

Black levels were more uneven, with a general trend of brighter blacks towards the top and darker blacks towards the bottom.

Color reproduction across the panel, however, is excellent, and virtually imperceptible between different parts of the display.

Power Use

As far as power usage goes, the PG27UQ has been specified for a peak 180W with HDR on. Stand-by was specified at 0.5W, but in practice the monitor often idled for some time around 27W in the power-off mode, before finally going to sub-1W power draw. The fan is on at that time, and it's not exactly clear how this state is governed.

Power Draw (Wall Measurements)

With G-Sync and HDR enabled, peaks of around 150W to 160W were observed during gaming, with a peak of 162W. In SDR mode, power consumption is more-or-less in line with typical monitors.

HDR Gaming Impressions Closing Thoughts
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  • Flunk - Tuesday, October 2, 2018 - link

    I'd really like one of these, but I can't really justify $2000 because I know that in 6-months to a year competition will arrive that severely undercuts this price.
  • imaheadcase - Tuesday, October 2, 2018 - link

    That's just technology in general. But keep a eye out, around that time this monitor is coming out with a revision that will remove the "gaming" features" but still maintain refresh rate and size.
  • edzieba - Tuesday, October 2, 2018 - link

    The big omission to watch out for is the FALD backlight. Without that, HDR cannot be achieved outside of an OLED panel (and even then OLED cannot yet meet the peak luminance levels). You;re going to see a lot of monitors that are effectively SDR panels with the brightness turned up, and sold as 'HDR'. If you're old enough to remember when HDTV was rolling uout, remember the wave of budget 'HD' TVs that used SD panels but accepted and downsampled HD inputs? Same situation here.
  • Hixbot - Tuesday, October 2, 2018 - link

    Pretty sure edgelit displays can hit the higher gamut by using a quantom dot filter.
  • DanNeely - Tuesday, October 2, 2018 - link

    quantum dots increase the color gamut, HDR is about increasing the luminescence range on screen at any time. Edge lit displays only have a handful of dimming zones at most (no way to get more when your control consists of only 1 configurable value per row/column). You need back lighting where each small chunk of the screen can be controlled independently to get anything approaching a decent result. Per pixel is best, but only doable with OLED or jumbotron size displays. (MicroLED - we can barely make normal LEDs small enough for this scale.) OTOH if costs can be brought down microLED does have the potential to power a FALD backlight with an order of magnitude or more more dimming zones than current models LCD can do; enough to largely make halo effects around bright objects a negligible issue.
  • Lolimaster - Tuesday, October 2, 2018 - link

    There is also miniled that will replace regular led for the backlight.

    Microled = OLED competition
    Miniled up to 50,000zones (cheap "premium phones" will come with 48zones).
  • crimsonson - Tuesday, October 2, 2018 - link

    I think you are exaggerating a bit. HDR is just a transform function. There are several standards that say what the peak luminance should be to considered HDR10 or Dolby Vision etc. But that itself is misleading.

    Define " (and even then OLED cannot yet meet the peak luminance levels)"
    Because OLED can def reach 600+ nits, which is one of the standards for HDR being proposed.
  • edzieba - Tuesday, October 2, 2018 - link

    "HDR is just a transform function"

    Just A transform function? [Laughs in Hybrid Log Gamma],

    Joking aside, HDR is also a set of minimum requirements. Claiming panels that do not even come close to meeting those requirements are also HDR is akin to claiming that 720x468 is HD, because "it's just a resolution". The requirements range far beyond just peak luminance levels, which is why merely slapping a big-ass backlight to a panel and claiming it is 'HDR' is nonsense.
  • crimsonson - Wednesday, October 3, 2018 - link

    "
    Just A transform function? [Laughs in Hybrid Log Gamma],"

    And HLG is again just a standard of how to handle HDR and SDR. It is not required or needed to display HDR images.

    "HDR is also a set of minimum requirements"

    No, there are STANDARDS that attempts to address HDR features across products and in video production. But in itself does not mean violating those standards equate to a non-HDR image. Dolby Vision, for example, supports dynamic metadata. HDR10 does not. Does that make HDR10 NOT HDR?
    Eventually, the market and the industry to congregate behind 1 or 2 SET of standards (since it is not only about 1 number or feature). But we are not there yet. Far from it.

    Since you like referencing these standards, you do know that Vesa has HDR standards as low as 400 and 600 nits right?

    And I think you are conflating wide gamut vs Dynamic Range. FALD is not needed to achieve wide gamut.

    And using HD to illustrate your points exemplifies you don't understand how standards work in broadcast and manufacturing.
  • edzieba - Thursday, October 4, 2018 - link

    "And HLG is again just a standard of how to handle HDR and SDR. It is not required or needed to display HDR images."

    The joke was that there are already at least 3 standards of HDR transfer functions, and some (e.g. Dolby Vision) allow for on the fly modification of the transfer function.

    "And I think you are conflating wide gamut vs Dynamic Range. FALD is not needed to achieve wide gamut."

    Nobody mentioned gamut. High Dynamic Range requires, as the name implies, a high dynamic range. LCD panels cannot achieve that high dynamic range on their own, they need a segmented backlight modulator to do so.
    As much as marketers would want you to believe otherwise, a straight LCD panel with an edge-lit backlight is not going to provide HDR.

    "And using HD to illustrate your points exemplifies you don't understand how standards work in broadcast and manufacturing."

    Remember how "HD ready" was brought in to address exactly the same problem of devices marketing capabilities they did not have? And how it brought complaints about allowing 720p devices to also advertise themselves as "HD Ready"? Is this not analogous to the current situation where HDR is being erroneously applied to panels that cannot achieve it, and how VESA's DisplayHDR has complaints that anything below Display HDR1000 is basically worthless?

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