HP 2311xi - Display Uniformity

Until now, all measurements on the HP 2311xi have been done in the dead center of the screen where we would expect the best performance. The best displays remain uniform across the whole panel and not just the center, so we measure nine spots across the display to see how well it does overall.

Looking at the white level for 200 nits of light output, most of the screen is very uniform given the price. The right side begins to have some drop off, with light output falling off by 15% at the right center location. This isn’t perfect, but it’s still pretty decent as most of the display is very uniform.

Since the uniformity issues with white are typically caused by uneven backlighting we might expect to see something similar with black levels, and we do. They are uniform across the left and center of the display, but then rise again on the right side of the display. This combination is a bit disappointing as lower white levels and higher black levels mean that we will see a lower contrast ratio when we look at that next.

As mentioned, the contrast is very variable across the screen. It ranges from very good on the left side to pretty poor on the right side. The center is right around what we expect from our previous measurements, but the rest of the screen measures from 780:1 on the left to 409:1 in the lower right.

Looking at the color uniformity, here the upper right corner has the largest issue. Since the backlighting is uneven on the right side, that unevenness can lead to a slightly different shade of light being used in that corner, which can lead to the higher dE we see there. Most of the difference is with the grayscale and not colors, which is common. Overall the color errors are very consistent across the display, even if the level of light isn’t as much on the right side, and it performs better than most displays I see pass through my system as far as uniformity is concerned.

LCD Color Uniformity

HP 2311xi - Color Quality and Color Gamut HP 2311xi - Input Lag and Power Use
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  • Khenglish - Monday, August 13, 2012 - link

    When I saw that a 23" version of a 27" screen was being released, I was hoping that it would be the same 2560x1440 resolution. Sadly it was not.

    Why can't anyone make a monitor with a pixel density higher than my 2002 CRT? A 19" 2560x1600 screen would be awesome and I would pay a lot for it. I'd rather not have to turn my head to look from one corner to the other with a 27" or 30" screen.
  • tecknurd - Monday, August 13, 2012 - link

    Manufacturing a CRT to display high resolutions like 2560 by 1600 does not require much. The electronics are what is require to handle resolutions. LCD on other hand, silicon cost a lot to make that amount of pixels and the high performance panel driver is then needed, so LCD has two pricey hardware to make a finish product. CRT just need the electronics.

    Using a 27 inch or 30 inch screen, you just need to sit further from it to see it all at once.
  • Sabresiberian - Monday, August 13, 2012 - link

    Really, the problem of price isn't as much of a barrier as we've been lead to think, as the influx of $300 (including shipping for S. Korea) 2560x1440 monitors has shown. Also, there are inexpensive phones and tablets that have far higher pixel densities than the monitors currently available.

    As far as using a bigger screen and sitting farther back - wut? That's, uh, not very practical and really makes no sense.

  • Zoomer - Tuesday, August 14, 2012 - link

    These korean monitors get lower grade panels. In other words, panels that are rejected for inclusion in top brands like Apple, HP, Dell, etc. That's why they are priced at that point.

    Phones and tablets use must smaller screens, and therefore, exponentially easier to make without defects.
  • scarhead - Monday, August 13, 2012 - link

    They will come before long. There's already a 15" laptop with 2880 x 1800.
  • janderk - Monday, August 13, 2012 - link

    High res displays have been here for a long time. Problem is price.

    For the price of that Apple laptop you mentioned, you can buy 15 HP IPS monitors. What is a shame is that all other Apple laptops feature low quality TN displays.

    It is quite revolutionary that you can buy a good IPS display for $200. One with 1200 vertical pixels even. I remember paying 1600 Euro for my 23" HP 2335 IPS display some years ago.
  • janderk - Monday, August 13, 2012 - link

    Correction to myself: The display is 1080. Not 1200.
  • KZ0 - Monday, August 13, 2012 - link

    Macbook Pro Retina uses an IPS panel.

  • janderk - Monday, August 13, 2012 - link

    That's why I said "all other".
  • Tetracycloide - Monday, August 13, 2012 - link

    I believe that's the one scarhead was referring to and the one janderk was excluding when he said 'all OTHER Apple laptops.'

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