REVIEW: ViewSonic VX2268wm Part 7

Brightness

Brightness	Manufacturer	Measured
100 %	300 cd/m²	266 cd/m²
50 %	k.A.	152 cd/m²
33 %	k.A.	117 cd/m²
0 %	k.A.	51 cd/m²

Viewsonic indicates a maximum brightness of 300 cd/m² for the monitor. Our measurement of 266 cd/m², measured in the factory settings, falls short of this value, but is more than sufficient for PC use. Considering the minimum brightness of 51 cd/m², the brightness range is 215 cd/m².

The black point is relatively bright – 0,27 cd/m² -, but it is acceptable with regard to the brightness of 266 cd/m². The resulting contrast of 985:1 is close to the manufacturer’s indication of 1.000:1. After calibration, the contrast ratio drops to a just mediocre 650:1.

The dynamic contrast indicated by Viewsonic (20.000:1) reflects the contrast ratio between two successive frames. We could not verify this value in our test.

Brightness distribution

In order to measure the brightness distribution, we measured the brightness at 15 different points across the entire screen. After increasing the brightness value to 53 percent, we achieved the ideal value of 140 cd/m² in the centre of the screen.

The brightness distribution of the Viewsonic VX2268wm, measured at 15 points.

The results of the measurements confirm our subjective impression of the homogeneity. The maximum deviation of 22 percent was measured at the points on the left and in the upper left corner. It seems that the entire left side of the VX2268wm is struggling with reduced brightness. At an average deviation of 12.4 percent from the calibrated brightness value, we rate the performance of the monitor in terms of brightness distribution as satisfactory.

Viewing angle

The manufacturer’s indications credit the VX2268wm with maximum viewing angles of 170 degrees horizontal and 160 degrees vertical. These values are good for the TN panel in our test model, but they are not above average. Furthermore, it must also be considered that the details are based only on the resting contrast. They do not make any indications on whether colour errors or negative effects arise from various viewing angles.

In fact, the viewing angle depending errors on the horizontal are limited – movements of the head to the left and right do not change the colours displayed too much; overall, the image becomes paler because the contrast is reduced and it also takes on a yellowish tint. The so-called gamma shift is even visible from angles in the double figures. It causes the slight bright patches that go hand in hand with increasing the gamma value.

Strong and colourful from the front, errors that are to be expected in the viewing angle limits that are relevant for gamers and office users – the colour display of the VX2268wm is good with the exception of the bottom picture.

The subjective impression that colours do not slip into the negative at any point is pleasing – there is no negative effect. The changes that arise as soon as the monitor is viewed from the top or bottom rather than from the front are more critical. In the first case, the paling and cooler colours may still be acceptable. However, from a viewing angle from above the screen, the colour display is very different.

Monitors with VA or IPS panels naturally perform significantly better in this regard. However on the whole, the viewing angle independence of the VX2268wm can be seen as satisfactory.

Measurements and calibration

Below, we tested the colour accuracy of the Viewsonic VX2268wm and checked how well the LCD monitor could be calibrated. These results are mainly relevant for graphics and photo editing. Generally, they can be neglected for office use and in games, since the subjective impression is more important for these applications.

First, we measured the maximum colour space of the LCD and compared it with both the ISO Coated printing colour space and with the sRGB colour space.

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