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REVIEW: Dell U2412M Part 13


In the video preset, the circuit is turned on by default and makes an unusually good impression here, too: Contrary to CCFL tubes, the LED backlighting can be switched quickly to a new target brightness, which allows rapid and subtle brightness changes. Especially in films with very dark scenes, a dynamic contrast circuit may well bring benefits - provided it is implemented well. The U2412M is one of the rare exceptions where this condition is fulfilled.

However, it is rather questionable, if the user benefits from it in practice. Because as it will turn out later, the U2412M is not the first choice for the display of videos, anyway.

Responsiveness

Connected to the DVI port, we measure the U2412M in native resolution of 60 Hertz. For the measurement, the monitor is reset to the factory setting.

Response time and acceleration behaviour

The response time is calculated for the black-white transition and the best grey-to-grey change. In addition, the average for our 15 measurement points is given. The data sheet for the DELL model U2412M names a reaction time of eight milliseconds (grey to grey). In our measurements, the fastest shift of grey is determined with a 11.2 milliseconds. Averaging 13.1 milliseconds, the overall response time (back and fourth) for our 15 reading points is not much longer. The differences between light and dark points are therefore low.

Short switching times for an IPS panel.

The brightness curve shows moderate acceleration. At most measuring points, we find moderate overshoot upwards and downwards. In most cases, the brightness change is only completed after two frames. Being fixedly implemented, the acceleration can not be influenced.

Latency

The latency is determined as sum of the signal delay time and half of the average frame. Key for gamers, we measure extremely short 0.9 milliseconds for the signal delay. Another 6.5 milliseconds later, the target brightness is reached. Being at 7.4 milliseconds, the mean total latency is very short.

Subjective assessment


The IPS panel of U2412M was trimmed to short switching times. The 6-bit colour control, as it is in use almost exclusively with TN panels otherwise, helps provide the display quite speedy response times – considered we deal with an IPS panel here! The overdrive circuit does the rest, but it is metered in such fashion that, in synthetic tests, artefacts are detected only to a relatively minor extent.

Playing fast games on the DELL U2412M is also possible. What is noteworthy is the fact that, despite fast response times, on a subjective level, the overdrive is barely noticeable in a negative way, something you cannot claim when it comes to the fastest TN panels, which get out a few milliseconds more here.

Interpolation

Due to technical conditions, a TFT monitor is only able to display its native resolution pixel-fine. Once a different resolution is chosen, there are two reasonable procedures: Either the monitor displays the signal pixel-fine, but only on a section of all of its pixels (1:1 display), or it performs an interpolation, which enables it to utilize its entire screen. It would be desirable if one could choose between these two possibilities.

Also interesting concerning interpolation: Either the input signal is displayed on the entire screen area, regardless of the original aspect ratio, or it is shown in the correct ratio (possibly with black bars). Optimally, you can choose between these two possibilities.

Our U2412M does not provide the possibility of 1:1 pixel-perfect display; so non-native resolutions necessarily are interpolated. The OSD setting "Aspect Ratio" allows users to choose between full-screen ("wide 16:10"), 4:3 ("4:3") and 5:4 display ("5:4").

In office use, these three formats are of main interest. An aspect ratio of 16:9, by far the most common in the consumer area, is not supported: Trying to feed 16:9 signals, the image is vertically compressed in each case and thus distorted.

According to its EDID data, the U2412M can be fed with following resolutions:

Resolution Refresh rate

Unconditionally, any resolution not mentioned here must be interpolated by the graphics card.

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