Since the On-Lap 2501M is a twisted-nematic (TN) panel, we’re using some comparison data from past reviews of 23- and 24-inch TN-based panels. We're also including data from the last four screens we tested, all of which are 27-inch IPS monitors.

With its brightness control set to maximum, the On-Lap comes up a tick shy of the 200 nit mark. For a monitor that will likely be used in bright environments, we would like to see a little more light output.

The max black level falls just below the middle of our pack. However, 0.4625 cd/m2 isn’t a bad result. In fact, in a high-ambient light environment, this will serve to keep shadow detail visible.
Contrast ratio is the most important factor concerning the perceived depth and dimensionality of the image. The greater the ratio, or dynamic range, the more three-dimensional the picture will appear.

The max contrast ratio is toward the bottom of the pack; a little more light output would help improve this number.
Turning down the brightness control all the way generates some very low numbers for both maximum white and minimum black.

At just over 17 cd/m2, the image is far too dim to be of any use, even in a blacked-out environment. We recommend setting the brightness to no lower than 25. At that level, the white luminance increases to around 45 cd/m2.
On the plus side, bottoming out the brightness slider produces a very impressive black level. Thanks to the On-Lap’s excellent gamma tracking, shadow detail is maintained even at this low reading.

Again, minimizing the brightness produces an image that is not practical for normal use. With the brightness control on 25, the black level is still less than 0.1 cd/m2, which puts it in fourth place.

The minimum stock contrast ratio is pretty much unaffected by the position of the brightness slider. No matter where it’s set, the ratio lands between 420: and 430:1.
Contrast performance is not a strong suit of any LCD panel, regardless of the technology it employs. While this metric has improved over the last few years, it’s still behind other display technologies, such as plasma. And alas, the tremendous dynamic range of our dearly departed CRT monitors may not be equaled until OLED panels become more viable.
- GeChic On-Lap 2501M Portable Monitor
- Measurement And Calibration Methodology
- Results: Stock Brightness And Contrast
- Results: Calibrated Brightness And Contrast
- Results: Gamma And ANSI Contrast Ratio
- Results: Grayscale Tracking
- Results: Color Gamut And Performance
- Results: Viewing Angle And Uniformity
- Results: Pixel Response And Input Lag
- Battery Life And Conclusion
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.
Come to think of it, laptops should include inputs too -- but to my knowledge, they never have.
Nice 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.
Forgot the link to the one I was talking about which is 13.3 inches
http://www.newegg.com/Product/Product.aspx?Item=9SIA0V108S5365
Absolutely.
You can get a 9 inch IPS TOUCH screen at 1900x1200 resolution, speakers, Weighs only 1.2 pounds and lasts for 8 hours on a charge.
For $20 more...$270.
http://www.amazon.com/gp/product/B008GFRE5A/ref=asc_df_B008GFRE5A?tag=hyprod-20&hvpos=1o2&hvexid=&hvnetw=g&hvrand=1878467891549516394&hvpone=
And it comes with a tablet included at no extra charge.