Screen
This aspect of the review is really completely beyond my expertise, but we have our in-house expert for that. Here’s what Fritz has to say about the AX15’s screen:
I’ll keep this short, hence the note on how I measured the panel. Unlike usual, this time I measured with my spectrophotometer from Calibrite (ColorChecker Studio) and the DisplayCal software. I also analyzed the display with NVIDIA’s LDAT. For the first time, you can see the UPRtek MK550T in the circle of my measurement technology. A spectroradiometer whose capabilities and accuracy make it one of the best colorimeters in the world. You could arrogantly say that the MK550T is beyond reproach. On the display of the MK550T you can see the calibrated white point (first line) and the brightness (last line). More about the MK550T can be found in a dedicated article.
Then we start with the spectral analysis (measured with the MK550T)
With regard to the spectral distribution of the installed IPS panel, the peak of the blue spectrum is at approx. 450 nm – with a calibrated white point of 6500 K. This means that the panel of the AX15 is not one of the Eyesafe-certified products with an allegedly harmful range between 415 and 455 nm. So much for that.
The color space coverage (DisplayCal & ColorChecker Studio)
Incidentally, the color space coverage for sRGB is only approx. 60 %. This is also the reason why the DeltaE values are relatively high (bad), which you will see in a moment.
The dotted triangle is the sRGB color space – 100 percent target. The colored triangle is the sRGB coverage of the AX15 panel in ACTUAL. Unfortunately, the panel cannot cover the standard color space by more than 90 percent. In my opinion, the built-in IPS panel is therefore fundamentally unsuitable for color-critical work.
Gray Scale and ColorChecker @ Default Settings
Gray Scale and ColorChecker @ after calibration to D65, 200 Nits, Gamma 2.2
The settings for the 6500 Kelvin white point and the 200 nits brightness.
Uniformity
There is no better way to calibrate the panel, as it cannot provide sufficient color space coverage. The image homogeneity is ok, I couldn’t detect any pixel errors. In my opinion, glowing and bleeding were also not noticeable to the usual extent.
Response Times vs. Overshoot
The pixel response times are rather old-school compared to a modern IPS panel. However, this is still ok for the max. 60 Hz.
Latencies and brightness
Unfortunately, I can’t measure the display lag on most laptops, so all that remains is the end-to-end latency. However, the E2E can be used to mathematically derive the approximate input lag and display latency, etc.
The E2E is measured from the grayscale RGB 64 to RGB 192, the response time here is already 16 ms (see Response Time Chart). Now we add the refresh lag = half the refresh rate, i.e. 8.3 ms on top of the 16 ms. This results in 16 + 8.3 = 24.3 ms. Now we can calculate the processing lag: 28.5 – 24.3 = 4.2 ms.
Display lag = (processing refresh lag): 12.5 ms
Input lag = (display lag avg. response time): 25.8 ms
Conclusion on the built-in display
For the price of the AX15, you can live with it. Basically, you shouldn’t have any expectations of the IPS panel in terms of fast response times or color fidelity. Nevertheless, it works and is bright enough at 280 nits. If you’re only using it to surf the Internet or perform office tasks on the move, the display will certainly suffice. I find it a pity that the built-in panel does not provide a color space coverage greater than 90 percent for sRGB.
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