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2D Performance

A tremendous advantage of the Trimon over the VR-helmets I mentioned in the Introduction is that it can be used as an ordinary monitor. Take off the eyeglasses, disable the stereo mode – and you have a trivial 22-inch monitor with a typical resolution of 1680x1050 pixels.

I tested the ZM-M220W in the ordinary mode following our traditional methodology.

Alas, one drawback can be seen right away: the monitor’s screen is lined up horizontally with 1-pixel-width lines. This is the consequence of using polarizers and films whose polarizing properties change with each line. This is quite conspicuous: a white background on the screen of the ZM-M220W looks striped even from a distance of 50 centimeters. This defect doesn’t make the monitor totally unusable, yet it is conspicuous.

The monitor’s Brightness and Contrast settings are both set at 50% by default. The brightness is regulated with the matrix rather than with the backlight lamps, so you should better leave it at 50%. Otherwise you will lose either darks (at lower values of Brightness) or lights (at higher values of Brightness). I achieved a 100nit white by selecting 50% Brightness and 24% Contrast.

Color gradients are reproduced with barely visible banding.

The monitor’s color gamut is perfectly standard. It coincides with the sRGB color space in reds and blues and somewhat larger than it in greens.

 

The average nonuniformity of white brightness is 5.3% with a maximum deflection of 13.8%. For black brightness the average and maximum are 5.6% and 24.0% respectively. The monitor is average in this respect. You can note that the bottom of the screen is brighter than the rest of it on a black background.

The gamma curves are acceptable. They differ somewhat from each other and go lower than the theoretical curve (for gamma 2.2) in lights.

When the Contrast is reduced to 24$, the curves improve somewhat except that the blue curve still differs from the others.

The measurements confirm my subjective impressions: if the Brightness setting is reduced to 30%, darks are indistinguishable from each other. The gamma curves are nearly horizontal at the beginning of the diagram. So again, I do not recommend you to change the Brightness setting of this monitor at all.

For an unclear reason, the color temperature settings are available for analog connection only. Besides a user-defined mode, there are three modes, none of which is satisfactory. The image is rather cold even in the Reddish mode while the temperature dispersion amounts to a few thousand degrees Kelvin.

To improve this I decided to set the monitor up manually using the showings of my DataColor Spyder 3 Elite calibrator. Lowering the Contrast setting to 25% (and keeping the Brightness setting intact), I selected the following in the user-defined color temperature mode: R=67, G=50, B=30. This produced a better result as you can see in the User column of the table above. But again, you can only use this setting when the monitor is connected via its analog interface. If the connection is digital, you have to use a hardware calibrator (if you have one) or your graphics card’s driver settings.

When put on the CIE diagram, the points of gray betray the same drawback: the image is too cold and there is a big difference between the temperatures of white and gray. The monitor doesn’t deflect much into green or pink, though.

 
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