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Choose Computer Monitor Based On Need And Performance
Todd Winslow
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At one point during the life of your desktop computer there may be a need, or a desire, to replace the monitor with one that better meets the needs of your program’s graphics. Most computers come with a monitor, but for those who buy them separately will want to consider what type of work they will be doing before settling for a monitor bundled with the system.
Typically, a .28mm dot pitch monitor will be sufficient for 19-inch monitors, even LCD monitors that have a real 19-inch diagonal measure. The relatively tight pixel pattern will offer decent resolution even on the finest graphics. For more detailed work or on larger monitors, a .16mm dot pitch may be needed. However, the distance between the pixels is not the only consideration when choosing a monitor.
Just like a television screen, a computer monitor works by having the picture sent to the screen in lines of image, one line at a time. It begins scanning the image to the screen at the to left, laying in one line, shifting back to the left and starting the scan over again. With interlaced monitors, it fills in the odd number lines first, then goes back to the beginning and fills in the even numbered lines. A progressive scan monitor fills in every line as it scan down the screen, rendering a sharper image for finer detail.
The scanning is performed so fast that it appears to the naked eye as being one picture is appearing at the same time. However, if a still photograph is taken, a progressive scan monitor will appear as a full picture. An interlaced monitor will have horizontal breaks in the image where the scan has not been completed during the second pass. The faster the shutter speed on the camera, the more lines will appear. While this has limited effect on most computer programs on others, such as in computer aided graphics programs and on some computer games it can cause an image to appear incomplete.
This scanning technique is used on monitors that use a cathode ray tube or liquid crystal display. Many people believe that liquid crystal displays do not suffer from ghosts due to burn outs, but as long as the screen utilizes the scanning technology, there is always a risk. This is why screen savers that do not hold one image on the screen for a long period are best.
Think back to the old television sets where an image could become burned into the inside of the phosphor coating on the inside of the picture tube if an image was allowed to libger too long. Although rare with computers due to automatic power settings and screen savers, the same risk is present.
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