Rabu, 05 Oktober 2011

LG W2340VG Monitor

We have not reviewed this product but here is CNET's buying advice on LCD Monitors. This content was chosen based on the features included with this model of lcd monitor.

Explaining Contrast Ratio

For a long time one of the most important things about LCD monitors was the contrast ratio; it was also the hardest to get good information on. While, in general, LCD monitor contrast ratios have gotten better, making it slightly less important, good information is still difficult to come by.
A 'ratio' of course is a comparison between two values. In this case, it is the comparison between the brightest white and the darkest black the monitor can generate. It needs to be noted here that 'black' on any screen (LCD or even CRT) is not the 'true' black created by an absence of light. There is always some light coming from every part of a screen that is powered on. So, this is a measure of the screen's maximum output divided by its minimum output.
In many ways, the truly important part is the minimum output, or black value. A truly bright white is also important, but not as hard to achieve. The contrast ratio is the manufacturer's attempt to boil all this down into one easily-compared statistic. It unfortunately also conceals important information. While the general idea that the higher the contrast ratio, the better the 'whites' and 'blacks' have to be is valid, it can conceal poor performance at one end with excessive performance at the other. (Generally, both black and white values will be too high for a good experience.)
Worse still is the fact that many contrast ratio numbers from manufacturers are completely out of line with reality. Most numbers are given without any reference to how they were tested. There is no standard for this measurement, so the various manufactures do not measure it the same way, adding to the confusion and inaccurate comparisons.
Most manufacturer-generated numbers use dynamic contrast, which is a measure of the absolute darkest and brightest values possible. This seems fine, but most LCD TVs and monitors use backlighting, which is adjusted up and down depending on the overall brightness of the image. The upshot of this is that it cannot produce its 'darkest black' and its 'brightest white' at the same time. It is considered preferable to measure static contrast which measures what the monitor can do simultaneously.
Moreover, manufacturer numbers are generally measured in a dark room, which produces the best results. This is technically the best measurement, but can be misleading on how a screen operates under more normal conditions. Theaters darken the room to enhance the viewing experience; light in the room can wash out the image, even without any worries about glare. For a consumer product it is considered more worthwhile to measure light output in a lit environment, where reflected light will raise the black and white values, decreasing the contrast ratio. Finally, the perceptual difference between different monitors goes down as the numbers go up.
In the end, most manufacturer-provided contrast ratio numbers are untrustworthy and inconsistent, although they can be a good general guideline. When seriously worrying about the contrast quality of a monitor look for testing data from a common source with stated testing conditions, like the CNET Labs data found in reviews on this site.
Read more in the Monitor Buying Guide
See more Explaining Contrast Ratio products

Game-friendly LCD

A monitor may have a good screen size, and great image clarity, but gamers also need an LCD monitor to have lightning-fast pixel response times to keep images sharp when the action starts.
Read more in the Monitor Buying Guide
See more Game-friendly LCDs products

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