A uniform backlight is essential for consistent colour rendering, however it remains a challenge for many screens. As we measure a difference of brightness within 80% of the maximum brightness, most of the screen’ results are within acceptable margins. The BenQ and the two Philips models are at the lowest acceptable value while the Iiyama and Acer are both one point below. If we look at the ratio between the averages of the 15 measurement points and the highest brightness, it does not look all that bad.
The uniformity of black is even more challenging, but as we often mention, the relative values often appear more dramatic than the absolute values which are much more comparable. The AOC I2481FXH clearly has the least uniform black together with the Philips screens while others do well to exceptionally.
You can find the results of each part of the tests for each screen separately below. What you should keep in mind, though is the following:
- For tests of the depth of black, the lower the measure value the better (greener graph), the higher – the worse (redder graph).
- For white, the colour coding is different, as we set the screens to a specific brightness of 150 cd/m². So, the closer it comes to the “true white” the greener value graph and the further away – the redder the graph.
- In contrast results, the highest contrast is green and the lowest is red. Anything in between will be coloured closer to the corresponding polarity colour. The relative value for good contrast is 1702:1, but if the result is 2581:1, the first value will become red instead.
- In the colour temperature tests, the values are marked blue if they are too low and yellow if they are too high.
- Additionally, the colour deviation: here we show tables with DeltaE value, where the value of 3 is almost visible to the naked eye and the colour of the box shows which colour the greyscale leans towards.