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.
- 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.