The brightness from different viewing angles indicates how well you can see the display when you're not directly in front of it. TN panels always suffer from some degree of colour shift, which is less of an issue with IPS and VA panels. The brightness always decreases, regardless of panel type. Horizontally, values of above 47 percent are good and above 50 percent are very good. Vertically, values above 10 percent are reasonable, above 15 percent are good, and above 20 percent very good.
At least this is the case for our MicroVision SS220 colorimeter – with our new test method these values are different, because the sensor is positioned at a different distance from the screen. First we look at the ‘old’ results. Here we see that the AOC U2879VF performs comparable to the models based on the same panel or one that is a lot like it. In comparison with the predecessor, the u2868qu, the vertical viewing angles are better.
New test method results
We measure the viewing angles in the new procedure from left and right, up and down. We also look at the colour deviation the is visible at an angle of 45 degrees and the standard deviation of this deviation. This is based on the RGBCYM, white and 75% white sub-measurements – the higher the SD, the more colour deviation. Aside from that we also have a graphical rendition of a measure of a 75% white surface, as you can see in the image below the table.
If we consider all of this, we can see that the monitor loses more brightness when looked at from the left than when looked at from the right. Both left and right show a colour shift to yellow – keep in mind that the image is not a photo but a graphical rendition! If looked at from below the largest colour shift is visible, also with the biggest standard deviation.
|45° left remaining brightness||38%|
|45° left average colour deviation ΔE 2000||19,7|
|45° left SD colour deviation ΔE 2000||5,5|
|45° right remaining brightness||54%|
|45° right average colour deviation ΔE 2000||13,4|
|45° right SD colour deviation ΔE 2000||4,3|
|45° above remaining brightness||22%|
|45° above average colour deviation ΔE 2000||13,9|
|45° above SD colour deviation ΔE 2000||8,8|
|45° below remaining brightness||28%|
|45° below average colour deviation ΔE 2000||40,8|
|45° below SD colour deviation ΔE 2000||14,5|
None of this is particularly remarkable for a TN-panel, and we have certainly seen worse – but that the result is better when using a different panel technique should be clear.