For a long period just about the most important things about LCD monitors was the contrast ratio; it absolutely was also the toughest to get straight answers on. While, generally speaking, LCD monitor contrast ratios have gotten better, so that it is slightly less important, reliable information continues to be tough to find.
A 'ratio' of course is really a comparison between two values. In such cases, it does not take comparison between the brightest white and also the darkest black the computer monitor can generate. It needs to be noted here that 'black' on any screen (LCD or perhaps CRT) isn't the 'true' black produced by an absence of light. There is always some light via every part of your screen that is powered on. So, this is the measure of the screen's maximum output divided by its minimum output. You should compare with a unit such as the viewsonic va2431wm.
In lots of ways, the truly important part will be the minimum output, or black value. A white is also important, although not as challenging to achieve. The contrast ratio could be the manufacturer's try to boil pretty much everything down into one easily-compared statistic. It unfortunately also conceals important info. As you move the general concept that the larger the contrast ratio, the greater the 'whites' and 'blacks' must be is valid, it may conceal poor performance at one end with excessive performance on the other. (Generally, both grayscale values is going to be too much for any good experience.)
Even worse is always that many contrast ratio numbers from manufacturers are completely out of line with reality. Most numbers are shown without the experience of how they were tested. There's no standard because of this measurement, therefore the various manufactures usually do not measure it the same way, adding to the confusion and inaccurate comparisons.
Most manufacturer-generated numbers use dynamic contrast, that is a way of measuring the complete darkest and brightest values possible. This seems fine, but most LCD TVs and monitors use backlighting, that is adjusted up and down with respect to the overall brightness with the image. The upshot on this is it cannot produce its 'darkest black' and it is 'brightest white' simultaneously. It's considered better than measure static contrast which measures what the monitor are capable of doing simultaneously.
Moreover, manufacturer numbers are usually measured inside a dark room, which produces greatest results. This is technically the very best measurement, but could be misleading on what a screen operates under more normal conditions. Theaters darken the room to enhance the viewing experience; light within the room can wash out your image, even without the worries about glare. For any consumer product it is considered more worthwhile to measure light output in the lit environment, where reflected light will raise the grayscale values, decreasing the contrast ratio. Finally, the perceptual difference between different monitors fails because the numbers go up. Viewsonic va2431wm review is available for your perusal.
In the long run, most manufacturer-provided contrast ratio numbers are untrustworthy and inconsistent, although they could be a good general guideline. When seriously worrying about the contrast quality of your monitor look for testing data from your common source with stated testing conditions, much like the CNET Labs data present in reviews on this website.
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