Desktop screens are usually 15 - 23 in. by diagonal measurement. (This is how TV screens are measured, too.) Larger sizes are available, at a significantly higher cost. Prices are dropping, but you still have to have the space for a bigger screen.
Determines how clear and detailed the image is. Pictures on a screen are made up of tiny dots. 1 dot on screen = 1 pixel (from "picture element") The more pixels per inch, the clearer and more detailed the picture. One measure of this is the dot pitch, the distance between the dots that make up the picture on the screen. However, different manufacturers measure differently. Most measure from dot center to the center of the nearest same color dot. Some measure from the center of a dot to an imaginary vertical line through the center of the nearest dot of the same color, giving a smaller number for the same dots as the previous method. Some monitors use skinny rectangles instead of dots and so must use a different method altogether. So, dot pitch has become less useful as a measure of monitor quality. A dot pitch of .28 is very common and .26 should be good for nearly all purposes, however it is measured.
CRT screens: How often the picture is redrawn on the monitor. If the rate is low, the picture will appear to flicker. Flicker is not only annoying but also causes eye strain and nausea. So, a high refresh rate is desirable. 60 times per second is tolerable at low resolutions for most people. 75 times per second or more is better and is necessary for high resolutions. (Does not apply to LCD screens)
Old types = CGA, EGA, VGA Current type = super VGA Determines what resolutions are available and how many colors can be displayed.
Color Graphics Adapter
320 x 200
Extended Graphics Adapter
640 x 350
Video Graphics Adapter
640 x 480
800 x 600, 1024 x 768, or 1280 x 1024 etc.
New systems now come with super VGA with a picture size of 800 x 600 pixels (as a minimum) and 16 million colors
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