The display

The visual interface between your computer and you is called as display. In desktop computers, an external display is called as monitor. A cathode ray tube (CRT) monitor resembles a television set without tuning or volume controls. A liquid-crystal-display (LCD) is thin. This kind of display is used in notebook and portable computers.  It has become popular for the desktop computers as technology has improved and has become less expensive.

Showing detail
The image resolution of computer display is significant. This is extent to which it shows detail: better the resolution, sharper the image. Resolution can be specified in the terms of dot size or dot pitch. This is diameter, in millimeters  (mm), of individual elements in display—the smallest unbreakable pieces. A good display has a dot pitch which is a small fraction of a millimeter. A typical CRT has a dot pitch of 0.25 or 0.26 mm. Smaller the number, higher the resolution and, all other factors being equal, crisper the image in an absolute sense.

The image resolution can be specified generally as a pair of numbers, representing the number of pixels (picture elements) the screen shows horizontally and vertically. For a particular screen size, greater number of pixels unit can display, the crisper the image. The computers, typical displays have either 800X600 resolution or 1024X768 resolution. Some them can work up to 1600    1200. Older computers often work at 640X 480.

Screen sizes are given in the terms of diagonal measure; a popular size is so called as 17-inch CRT (which has a viewable display measure of nearly 15.5 inches). This will work very well at 800X600 pixels. For the higher pixel dimensions, a larger screen is preferred, like19 or even 21 inch, but CRTs that size are expensive, can easily take up most of the surface of the desk, and can weigh 50 to 100 pounds. A small 15-inch CRT) is enough if you intend to work at 640X480 pixels.

Choice of display
Some of the computer users can get along with one display until it completely wears out. If you use your computer only for the text-based applications, you will probably find a modest 15- inch monitor adequate for your requirements. But if you find yourself scrolling left and right because you work with lines longer than 80 characters or because the program you just purchased assumes you have a larger monitor, it’s a good idea to upgrade. If you have to squint to see tiny images on screen, likewise, you should think about enlarging the image rather than wearing eyeglasses (unless you really need glasses).

If you are buying a new computer system, it is a good time to buy the best monitor you can afford. Many new desktop computers are sold with monitors, but some are not, allowing you to choose your own. In that particular case, again, you should be sure that the monitor is compatible with rest of the system. If you are buying a notebook computer, you will have options between less expensive and more expensive displays. The best way to make a decision what you want is to look at several displays in the store. Side by side comparisons can be especially revealing.

Some displays show more colors than others. The color resolution of a monitor is quoted as a number, like 256 colors, thousands of colors, or millions of colors. Color specifications are oversimplified, because color has 2 distinct properties, called as hue and the saturation. The hue can be technically represented by peak wavelength, but often is described in terms of words (red, orange,