REVIEW: Lenovo L2440p Part 11

Input-Lag

Delays in image output in compared with a cathode ray monitor were measured by connecting the L2440p and a 21-inch CRT at the same time and displaying a stop clock on both screens at the same time, then taking photographs. In the course of the test, 6 of these photos were evaluated, in which the CRT can be seen on the left and the Lenovo LCD on the right.

The average lag measured is 6 ms, which is considerably lower than the display time for a single frame. Two thirds of the photos demonstrated a lag of 0 ms. `The remaining third demonstrated fluctuating values of up to 30 ms in exceptional cases.

Two thirds of the photographs displayed no lag.

The maximum value was 30 ms, which is the equivalent of two frames.

In view of the low average lag of 6 ms, this monitor is certainly very suitable for amateur gamers. Professional hardcore gamers will, however, prefer to purchase monitors without any input lag. In some cases, the other results with regard to the image quality and interpolation should also be considered, since these may also lead to limitations.

For most users, an input lag is generally of no consequence and will not be noticed. However, each individual responds differently here and each PC system demonstrates different "basic lags". Both of these factors affect the extent to which an input lag is noticed.

Interpolation

When it comes to interpolation, the model demonstrates some weaknesses, but this is also linked to the fact that justified display does not work and unfortunately, 1:1 display as an alternative is not supported for resolutions lower than 1.920 x 1.200.

However, film fans in particular will be annoyed that 1.920 x 1.080(p) can only be displayed as full screen and only via DVI. If justified display is selected in the OSD (i.e. if "Off (Original AR)" is selected under Scaling), the image is incomprehensibly compressed together towards the sides.

Scaling Off" also causes compression of the image in image content at 1.920 pixels. As can be seen clearly, the blending in of the OSD reaches to the right edge of the screen, but the screen content does not.

Other examples here can be found in the video section. This behaviour is the same for all resolutions and does not give rise to a convincing result in any resolution, even 4:3 resolutions.

Left: The native resolution of 1.920 x 1.200 pixels is sharp and precise. Even for analogue playback, this resolution can be used well. Right: Display of 1.920 x 1.080 pixels stretched to full screen. Interpolation to a height of 1.200 pixels gives rise to unpleasant shadows on horizontal lines.

Detail of interpolation artefacts at 1.920 x 1.080. The small "e" in particular suffers visibly in normal text.

Interpolation at 1.680 x 1.050 is very blurred – more so than is seen in the picture. This means that it is unpleasant to read text. Use of the monitor at this resolution should not be an option for everyday office work. At 1.600 x 1.200, the interpolation is subjectively somewhat better, but text in particular still looks blurred. In addition, justified display is not possible without errors. The display does not become any sharper when the appropriate setting is activated in the OSD.

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