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GeChic On-Lap 2501M 15.6" Battery-Powered Monitor, Tested

Results: Gamma And ANSI Contrast Ratio

Gamma

Gamma is the measurement of luminance levels at every step in the brightness range from 0 to 100 percent. This is important because a poor gamma can either crush detail at various points, or wash it out, making the entire picture appear flat and dull. Correct gamma produces a more three-dimensional image, with greater depth and pop. Meanwhile, incorrect gamma can negatively affect image quality even in monitors with high contrast ratios.

We’re now including the gamma tracking charts for all the monitors we test. The yellow line represents 2.2. The closer the white measurement trace comes to 2.2, the better.

The On-Lap does fairly well in this test. The values drop slightly as the signal level approaches 90 percent. A lower gamma value means the image is too bright at that luminance point. The measurement at 90 percent is around 1.8, which equates to four percent too high.

Turning to the comparison charts, the On-Lap performs adequately versus its competition. We don’t have gamma data for any of the TN-based panels from past reviews, so we only included the IPS monitors in these charts.

Bear in mind that the four IPS panels in this comparison boast superb gamma performance, and the On-Lap is only slightly behind the group.

The gamma value range tells us how close each signal level from zero to 100 percent comes to the 2.2 standard.

This is a very good result. The lower numbers indicate flatter gamma tracking. This means the display will closely match the mastering specification of the original content, so you’ll see maximum detail no matter what the brightness level is set to.

ANSI Contrast Ratio

Another important measure of contrast is ANSI. This is a relatively new benchmark for our monitor reviews. To perform this test, a checkerboard pattern of sixteen 0 and 100 percent squares are measured. This is somewhat more real-world than on/off measurements because it tests a display’s ability to simultaneously maintain both low black and full white levels. This test also factors in screen uniformity. The average of the eight full-white measurements is divided by the average of the eight full-black measurements to arrive at the ANSI result.

It’s not surprising that the On-Lap doesn’t do particularly well. After all, the on/off contrast is only fair. On the plus side, its ANSI contrast ratio is slightly higher than its on/off ratio, meaning that contrast will be maintained no matter what image is being displayed.

  • mayankleoboy1
    So even though the hardware itself is excellent, the final product is too niche-y to sell ?
    Reply
  • slomo4sho
    A portable monitor at the conveniently low price of an entry level tablet or chromebook... I see real utility here.
    Reply
  • Fulgurant
    I might be interested in something like this at some point. Nice review.
    Reply
  • Senor Kalyan
    http://us.aoc.com/monitor_displays/e2251fwu
    Reply
  • warezme
    It is an industry artificial block in my opinion. All they would have to do is include a little extra circuitry to the existing pads for an HDMI input and viola, you could use your pad as a monitor to another device. Most pads have at least that resolution on some even better. I would never buy this item unless it was under $150 or less. It is a one trick pony with a low resolution screen.
    Reply
  • groundhogdaze
    I'd love to have one of these portable monitors. I've go a bunch of headless PC's that I need to check every once in a while and don't want to lug a regular monitor around nor hunt for a power socket for the test monitor. If only the price were a little lower...
    Reply
  • Fulgurant
    warezmeIt is an industry artificial block in my opinion. All they would have to do is include a little extra circuitry to the existing pads for an HDMI input and viola, you could use your pad as a monitor to another device. Most pads have at least that resolution on some even better. I would never buy this item unless it was under $150 or less. It is a one trick pony with a low resolution screen.I don't disagree that tablets could easily include an input, but to be fair, this product is far bigger than a tablet. It may only have a niche use, but it is clearly better suited for that niche use than a tablet screen would be.
    Reply
  • Fulgurant
    FulgurantI don't disagree that tablets could easily include an input, but to be fair, this product is far bigger than a tablet. It may only have a niche use, but it is clearly better suited for that niche use than a tablet screen would be.Come to think of it, laptops should include inputs too -- but to my knowledge, they never have.
    Reply
  • g00fysmiley
    interesting concept but would be nice if bluetooth connectivity wee there unless i am missing somethign it s hdmi only. touchscereen i know is pricier but again would add to utility. interesting product just as it is looks very limited
    Reply
  • RedJaron
    Senor Kalyanhttp://us.aoc.com/monitor_displays/e2251fwuNice product, except it doesn't have its own power supply and can only take a USB signal over a DisplayLink driver. Makes for a nice quasi-mobile secondary monitor for computers, but it won't connect to most types of mobile devices like the GeChic will.
    Reply