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REVIEW: Dell U2713HM Part 8


Interpolation

The aspect ratio for the display can be determined in the OSD of the U2713HM. Here, the user can choose from Full Screen (16:9), 4:3 and 5:4. Thus, display in the correct aspect ratio should be possible for virtually all cases. However, there is no automatic recognition of the aspect ratio being played back, so when there is a change, the user must intervene manually.

There is no 1:1 option, which means that non-native resolutions must always be interpolated. Naturally, an interpolated image cannot compare with the sharpness of an image played back in its native aspect ratio. Due to the finer pixel resolution of the U2713HM (0.23 mm pixel distance), the interpolation blurring is, however, considerably less pronounced than in other monitors with coarser pixel structures. For example, when the screen is viewed from a somewhat larger distance for 1080p mode, it is hardly visible that the image is being interpolated.

The U2713HM has a sharpness regulator, which can be activated in the OSD in the submenu "Display settings". Here, values of between 0 and 100 can be selected in steps of 10, with the standard setting at 50, which is also the neutral setting. Higher values make the image sharper and smaller settings make it less shark.

Test image in native resolution.

Test image in 1.920 x 1.080 and 1.280 x 720.

Test display in native resolution.

Text display in 1.920 x 1.080.

Text display in 1.280 x 720.

The U2713HM manages interpolation acceptably. Within the scope of what is physically possible, texts appear sharp and even on the screen, even after interpolation. As we have mentioned, the high pixel density also has a positive effect on the interpolation, so it is absolutely possible to work on the monitor even in non-native resolutions.

Thus, only the lack of a 1:1 mode stands in the way of a rating of very good in this area, but the graphics card must then take over for this function.

Responsiveness

We carried out measurements on the U2713HM in its native resolution at 60 Hz via the DisplayPort. For the purpose of the measurements, the monitor was restored to its factory settings.

Image construction time and acceleration behaviour

We measured the image construction time for a black-white change and the best grey-to-grey change. We also measured the average value for our 15 measuring points.

The datasheet indicates a response time of 8 milliseonds (GtG). We did not find an overdrive option, so we measured the monitor in its factory settings and arrived at a result of 11.4 milliseconds for a black-white change and 10.8 milliseconds for the fastest grey change. The average value for our 15 measuring points was 14.3 milliseconds.

Fast switching times, with some outliers.

Generally, an IPS panel only achieves such short switching times with overdrive, and a glance at the luminance gradient shows that this is also the case here. An acceleration system (non-deactivatable) ensures fast switching across the full luminance range. Small outliers arise for the brighter grey values, but without any visible negative effects on the image quality. Overall, the overdrive solution seems to have been carefully and very well implemented.

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