Many LCD monitors have one or more dead pixel on their screen panel. As you know, a dead pixel is a defective pixel that remains unlit or you can say always off pixel. This kind of defective pixels are usually best seen against a bright background, like white, it’s the best. Many people usually say that dead pixel is a pixel that remains on, a white colored pixel or so on, but actually, these are defective pixels that perform unexpected/ undesirable. Defective pixels itself by ISO 13406-2 are distinguished between three different types of defective pixels. Hot pixel, is the opposite of dead pixel. This pixel is always on and white colored pixel. Dead pixel, is a pixel that always off and Stuck Pixel, will usually be most visible against a black background. These defective pixels happen because of LCD’s transistor(s) malfunctioning.
So, here’s a software that can help you to test the LCD monitor you want to buy before you feel disappointed. Dead Pixel Buddy is a software that can do several color test for your LCD. It can do white screen background test to see a dead pixel or more on your screen and a black bankground to see hot pixels.
ISO 13406-2, is an ISO standard for LCD replacement warranty, but not all manufacturers use this standard, you have to know their standard before you buy the LCD and ready for their warranty agreement, you can see the detailed standard at Wikipedia.
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