A majority of monitors, especially newer models, display excellent grayscale tracking (even at stock settings). It’s important that the color of white be consistently neutral at all light levels from darkest to brightest. Grayscale performance impacts color accuracy with regard to the secondary colors: cyan, magenta, and yellow. Since computer monitors typically have no color or tint adjustment, accurate grayscale is key.
Because AOC's E1659FWU has no calibration controls, we can only show you a single grayscale result.

The color temp is very cool, with an obvious blue tint to the image. The advantage of this is that the panel look a little brighter than its luminance numbers would suggest. Our main complaint is that you can’t match the color temp of the E1659FWU to your main monitor. Since its main use is as a secondary screen, there should be a way to synchronize its color settings. Even a couple of presets would be an improvement.
Here is the GeChic’s out-of-box measurement.

This result shows the user color temp preset with no changes made to the RGB sliders. There is a slight blue tint to the image that increases with brightness. This is the best mode to use if you don’t calibrate. The warm preset adds a noticeable red tint, and makes the image look a bit flat.
Now, here's the calibrated result.

This is one of the best grayscale charts we’ve seen. The Delta E error is under one at all brightness levels except for 10 percent, where it is still comfortably under two. We're pleasantly surprised by such an excellent performance.
Let’s bring our comparison group back into the mix.

Neither portable does particularly well by default, and the On-Lap 1502I demonstrates more grayscale error than its predecessor, the On-Lap 2501M. AOC’s E1659FWU has errors ranging from a low of 2.78 to a high of 15.71 Delta E.
GeChic's submission can be calibrated to a high standard at least, while AOC’s portable must make do with no adjustment.

The On-Lap 1502I even bests a number of desktop screens in our comparison group. Its IPS glass offers excellent grayscale performance. And a wide range of adjustment means you can match the color temp to any desktop monitor you use it with. If you go with AOC's more affordable option, we recommend using a product like CalMAN or Spyder to generate a LUT so your screens display the same color temp.
Gamma Response
Gamma is the measurement of luminance levels at every step in the brightness range from 0 to 100 percent. This is important because 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 a greater sense of depth and realism. Meanwhile, incorrect gamma can negatively affect image quality, even in monitors with high contrast ratios.
In the gamma charts below, the yellow line represents 2.2, which is the most widely accepted standard for television, film, and computer graphics production. The closer the white measurement trace comes to 2.2, the better.
We begin with the E1659FWU’s graph.

AOC's E1659FWU redeems itself with a decent gamma measurement. Tracking is fairly flat from 10 percent brightness on up. And the values stick pretty close to 2.2. A dip at 10 percent represents a brightness level that’s 1.7 cd/m2 too high.
The On-Lap 1502I’s chart looks even better.

GeChic's gamma response is just as good as its grayscale accuracy. Tracking is almost ruler-flat, with just the tiniest dip at 90 percent brightness. This helps increase perceived contrast quite a bit.
Here’s our test group again for the gamma comparisons.

GeChic's 1502I and the 2502M display the best gamma response among our portable contenders. A range of .14 places the company's newest product among the best displays we’ve reviewed. AOC isn’t far behind with a .39 variation.
We calculate the average gamma deviation by simply expressing the difference from 2.2 as a percentage.

None of the portable monitors we’ve reviewed stray too far from the 2.2 gamma standard. This helps improve perceived contrast, which is a good thing considering the middling native contrast performance we already measured.
- AOC E1659FWU And GeChic On-Lap 1502I, Two Portable Monitors
- Packaging, Physical Layout, And Accessories
- Setting Up The AOC E1659FWI And GeChic On-Lap 1502I
- Measurement And Calibration Methodology: How We Test
- Results: Brightness And Contrast
- Results: Grayscale Tracking And Gamma Response
- Results: Color Gamut And Performance
- Results: Viewing Angle And Uniformity
- Results: Pixel Response And Input Lag
- Two Portable Monitors: Simple Value Or Touchscreen Luxury
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).
-Christian-
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.
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?
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.
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.
Hopefully this thing has (micro)SD card support and unlocked bootloader. Wired networking support woudl be a big plus too.
If folks at Acer come to their senses regarding the pricing and the SoC.and sort out the feature set they might just be able to start the new PC revolution IT analysts have been predicting for 2015(-ish), one without x86 and Microsoft's Windows. With Ubuntu working on their mobile touch-enabled OS I can see them clinching a piece of the pie too.
ASUS $219
http://www.amazon.com/MB168B-15-6-Inch-Screen-LED-Lit-Monitor/dp/B00H0FK2A6/ref=sr_1_2?s=electronics&ie=UTF8&qid=1388829044&sr=1-2&keywords=asus+usb+monitor