Zalman ZM-M240W Stereoscopic 3D Monitor - Testing the ZM-M240W

Article Index
Zalman ZM-M240W Stereoscopic 3D Monitor
Features and Specifications
Testing the ZM-M240W
Subjective Tests and 3D


A Word About Testing:

In everything we try and be fair, accurate and as objective as possible when it comes to testing hardware.  In the past, LCD reviews were done completely subjectively, but we have purchased some equipment that takes some of this out of the equation.  Take a look at our LCD Testing methodology over here to get a better idea of how we test LCDs.

We won't spend much time in the menu; it is pretty standard although a little stripped down in terms of contrast, color adjustments and the like.  The only real setting in the menu that will help you tweak your screen is the "Brightness" and "Contrast" control.  We weren't able to do the Color Accuracy testing as we didn't have access to the Colorimeter at this point.  As this LCD is designed for gaming and 3D images, we'll focus more on brightness, contrast ratio and actual gameplay experiences.

Contrast Ratio & Uniformity: 

With the brightness and contrast set to defaults, we take our contrast readings.  With this setting chosen and the display calibrated we set out to find the "real" contrast ratio of the ZM-M240W. 

 Black Spot
White Spot
Contrast Ratio
229 208:1


I know we may take some flak for the above results, but this contrast ratio is exactly what the consumer will see when the display is set up properly.  It doesn't come close to being 1000:1 and even when we maximize the contrast and brightness, we don't get much above 250:1.  Keep in mind that this display is still very nice, clear and doesn't burn your eyes with too much brightness.  Companies pad their specs, much like gamers pad their stats in their favorite online game.  It doesn't mean the product is bad, merely that specs are over-rated.


We use our luminance meter in a dark environment to measure brightness uniformity.  To measure brightness, we use a bright white screen and measure across the screen in a grid to get our readings.  The brightest spot is considered to be 100% and the blackest point (with a black screen) is considered to be reference 0%.  The other values are obtained by calculating the difference between the two.  The screen is often brightest near the center. 

 3D Brightness Chart
3D Brightness Uniformity
2D Brightness Chart
2D Uniformity



As you can see the backlight drops off in certain areas of the display, but never drops below 78% of the brightest point.  While that may sound like a lot, often other "premium" displays from other companies can vary as much as 30%.  The Zalman ZM-M240W comes in with a maximum 22% variation.

On the last page we'll cover some real-world applications including gaming and movies in 3D as well as day-to-day tasks before we wrap things up.