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REVIEW: Dell U2312HM Part 13


The luminance curve, which increases constantly at a homogenous contrast ratio, shows that the luminance is adjusted directly and exclusively via the backlight, i.e. just as it should be. Above around 70 percent, the luminance curve demonstrates a considerably stronger increase than in the lower luminance range.

The light density range stretches from around 110 cd/m² to about 340 cd/m². Thus, sufficient reserves in the higher levels remain for bright rooms. The minimum achievable luminance of somewhat more than 110 cd/m² is, however, considerably too high for working in darkened rooms. The value is also too high for night time work in normal room lighting conditions and may cause over-straining of the eyes and even headaches. Users who sit at the PC in the evening or at night without lighting in the room will soon feel these effects. In order to avoid these problems, users should always ensure that the room is lit adequately.

The contrast is always at a good level of about 900:1 but thus falls slightly short of the manufacturer’s indication of 1,000:1. Nonetheless, it is a good value, especially for an IPS panel.

Dynamic contrast

The U2312HM is equipped with a dynamic contrast solution. Usefully, this is deactivated as standard, since the changes in luminance are generally rather irritating during normal work.

In the Video pre-defined mode, however, this feature is active as standard and makes an unusually good impression: unlike CCFL tubes, the LED backlight can be switched quickly to a new target luminance, which allows for rapid and subtle changes in luminance. Especially in films with very dark scenes, a dynamic contrast solution can absolutely bring advantages with it – provided that it is well implemented. The U2312HM is one of the rare exceptions in which this condition is actually met.

Responsiveness

We carried out measurements on the U2312HM in its native resolution at 60 Hz connected via the DVI connection. The monitor was restored to its factory settings for the measurements.

Image construction time and acceleration behaviour

We measured the image construction time for a black-white change and the best grey-to-grey change. In addition, we have selected the average value for our 15 measuring points.

The data sheet of the U2312MH indicates a response time of 8 milliseconds (GtG). At 12.3 milliseconds, our measurements uncover a considerably higher value. The overall image construction time (there and back) for all 15 measuring points is even a little longer at 16.5 milliseconds.

Fast switching times for an IPS panel.

There is an overdrive option on this model. At most of the measuring points, the luminance gradient demonstrates considerable acceleration, but this only brings about a small number of outlying values.

Lag time

The lag is measured as the total of the signal delay time and half of the average frame change time. We measured the signal lag, which is important for gamers, at am extremely short 1.1 milliseconds on the U2312MH. When half of the average frame change time of 8.2 milliseconds is added, the average overall lag amounts to 9.3 milliseconds, which is still very short for an IPS panel.

Subjective evaluation

The IPS panel in the U2312HM has been designed for short switching times; the 6-Bit colour control, which is otherwise almost exclusively used in TN panels, helps the screen to achieve truly fast switching times for IPS technology; the overdrive solution goes a step further, but it is so regulated in doing so that distracting side effects can only be uncovered in synthetic tests at low levels.

It is possible to play even very fast paced games on the U2312HM. The fact that the overdrive solution hardly makes itself noticeable in a negative way when viewed subjectively, despite the fast response times, is worth mentioning. This claim can no longer be made regarding the fastest TN panels, which manage to squeeze out a few more milliseconds.

Compared to the U2412M, the 23-inch model performs a little less well, but is still very suitable for gaming.

Interpolation

Due to the technology used, an LCD monitor can only display material in a pixel precise manner to fill the screen in its native resolution. As soon as a different resolution is played back, there are two sensible ways to proceed: either the monitor can display the signal in pixel by pixel format on part of its pixels only (1:1 display) or an interpolation can be carried out the entire screen can thereby be used. It would be desirable for the user to be able to choose between these two options.

During interpolation, the input signal is either distributed across the entire screen surface with no regard for the original aspect ratio or it is displayed in the correct aspect ratio (with black bands if needed). As is ideal, the user can choose between both these options.

The U2312HM does not offer the option for pixel precise 1:1 display; non-native resolut8ions are therefore inevitably interpolated. The user can choose from Full Screen - ("Width 16:9"), 4:3- ("4:3") and 5:4 display ("5:4") via the "Length / Aspect Ratio" settings in the OSD.

Its native 16:9 resolution means that the U2312HM can play back the standard widescreen formats without distortion on the screen, unlike its 16:10 brother.

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