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The maximum brightness (colour temperature: native) was measured at around 397 cd/m². This exceeds the manufacturer’s indication of 360 cd/m². The value in cd/m² always correlates well to the actual luminance. Possible settings range as far as 400 cd/m². With ColorComp, the target and actual values also match. If necessary, the function can be reduced step by step. This is necessary, since NEC’s compensation solution reduces the white level as a necessity. Unfortunately, in this case, the level that is actually selected (0-5) is not displayed in the OSD. The number simply turns magenta in colour.

A white point of 6500K leads to a reduction of the maximum brightness to about 383 cd/m². At 5000K, the value is about 366 cd/m². This is completely normal. Since the white point can only be adjusted directly via the backlight with RGB LED backlights, the contrast also drops with variations via the panel.

The two graphs below show the behaviour of the luminance and black point (the quotient of which defines the contrast ratio) for deactivated and maximum active ColorComp (Level 5). The step by step reduction of the compensation with increasing luminance is clearly visible.

Brightness and contrast gradient of the NEC PA301W (left: ColorComp off, right: ColorComp level 5).

Brightness distribution and image homogeneity

We tested the brightness distribution and image homogeneity using a white test image, carrying out measurements at 15 points on the screen. These measurements result in the brightness deviation in percent and the DeltaC (i.e. the difference in colourfulness) with regard to the value measured in the centre.

The measurements emphasise the importance of ColorComp. When the compensation solution is deactivated, the deviations in luminance and colours are still at a satisfactory level as long as we consider the large panel surface. The DELL U3011 delivers comparable results here, with an identical panel.

With ColorComp at the highest level (5), the NEC PA301W delivers a very good result with regard to deviations in luminance and colour. Therefore, one should definitely active the function and accept the loss of contrast. Other manufacturers give the user no choice at all and activate compensation solutions automatically if they include such functions at all.

The brightness distribution (left picture) and image homogeneity (right picture) was measured at 15 points on the screen - ColorComp off.

The brightness distribution (left picture) and image homogeneity (right picture) was measured at 15 points on the screen - ColorComp 5.

Viewing angle

The manufacturer’s indication for the maximum viewing angle is 178 degrees horizontal and vertical. The values indicated are based on a resting contrast of 10:1. These are typical values for modern IPS and VA panels. TN panels achieve similar viewing angles on paper, but at a resting contrast of 5:1. This means that the values are not comparable. In addition, other colorimetric changes are not included in the values indicated.

Therefore, the actual subjective viewing angle stability without visible colour errors, negative effects or changes to other image parameters is more important than the viewing angle measurement with regard to the resting contrast.

Viewing angles on the NEC PA301W

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