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AOC E1659FWU And GeChic On-Lap 1502I: Portable Monitors, To Go

Results: Viewing Angle And Uniformity

AOC's E1659FWU looks similar to other TN screens we’ve photographed. Detail is greatly reduced as you move off-center, especially in the up or down direction. If you set this monitor up on a desktop, be sure to angle it towards you. If you’re using it on your lap, it’s pretty easy to maintain a centered perspective. If the E1659FWU were brighter, it would do a little better in this test.

The On-Lap 1502I demonstrates a significant improvement over its TN-based predecessor, the 2501M. IPS really is the way to go here. Side to side, there is only a little light falloff and no color shift. Top to bottom reveals some light falloff and a blue color shift. This panel is much better than the last On-Lap we reviewed, to be sure.

Screen Uniformity: Luminance

To measure screen uniformity, zero percent and 100 percent full-field patterns are used, and nine points are sampled. In a change from previous reviews, we’re now comparing the results to other monitors we’ve measured. First, we establish a baseline measurement at the center of each screen. Then the surrounding eight points are measured and their values expressed as a percentage of the baseline, either above or below. This number gets averaged. It is important to remember that we only test the review sample each vendor submits. Other examples of the same monitor can measure differently in this metric.

First up is black field uniformity.

These numbers aren't as bad as they look. We can’t see any significant hot spots on either screen. As expected, GeChic’s more expensive IPS panel is a little better than AOC’s TN one.

Here’s the white field measurement.

Both the On-Lap 1502I and the E1659FWU deliver excellent white field uniformity. They measure as good as or better than most desktop displays we’ve reviewed.

Screen Uniformity: Color

To measure color uniformity, we display an 80-percent white field and measure the Delta E error of the same nine points on the screen. Then we subtract the lowest value from the highest. A smaller number means a display is more uniform. Any value below three means that variation is invisible to the naked eye.

We don’t have color uniformity data for the On-Lap 2502M or AOC I2757FH. However, with Delta E variations of 1.46 and 1.99, both portables being reviewed today have no visible color error on a white field pattern.

  • g-unit1111
    Interesting, I'm interested in getting one of the USB displays but the resolution is keeping me from purchasing one. I'd like to see how the AOC monitor compares to the ones being offered from Asus, HP, Dell, and so on and so forth.
    Reply
  • mathew7
    So....I am looking for a few years for a small (15" would be limit) portable VGA+HDMI monitor (as in not a bulky stand). I don't need FullHD resolution, but it should accept it.

    In a related note, I have been thinking about a laptop-styled monitor+keyboard (and maybe mouse/touchpad) but to be plugged into a desktop PC. You know...when you receive a PC case (or go to someone) and have to debug it. But again, 15" is already big (I'm using a 12.5" thinkpad when not at my gaming/workstation PC).
    Reply
  • Amdlova
    can connect to smart phone!???
    Reply
  • ceberle
    You can connect the On-Lap to a phone or tablet via its HDMI/MHL port. The AOC will only work via USB.

    -Christian-
    Reply
  • Nicolai8086
    When can we expect a Miracast (or WiDi) version of these screens?
    Reply
  • CrisCrossed
    Two words:
    Able HD
    http://www.able-hd.com
    One of the most funded projects on kickstarter. These guys make portable monitors that are HD and really cheap. Unfortunately, they still have their flaws (the circuit board is exposed and not attached to the screen) but you cannot beat the price/performance.
    Reply
  • Nicolai8086
    The weight is impressive, but i wouldn't call 17" portable.
    Reply
  • g-unit1111
    12343796 said:
    Two words:
    Able HD
    http://www.able-hd.com
    One of the most funded projects on kickstarter. These guys make portable monitors that are HD and really cheap. Unfortunately, they still have their flaws (the circuit board is exposed and not attached to the screen) but you cannot beat the price/performance.

    I have to say after reading about these that I do want one. When my laptop's primary display is 1920 x 1080, why would I want to add a second monitor that's 1366 x 720?
    Reply
  • egaskill
    Portable display for Raspberry Pi?
    Reply
  • CrisCrossed
    I have to say after reading about these that I do want one. When my laptop's primary display is 1920 x 1080, why would I want to add a second monitor that's 1366 x 720?
    I'm sorry, I mistyped. The monitor is actually a FHD (1080p) display, and it comes in 15.6 and 17 inch screens. I hope this helps. I'm ordering mine soon to use with a LAN box.
    Reply