Monitors are one segment where you are truly spoilt for choice.
Be it a 15-inch, 17-inch or 19-inch CRT monitor* or a sleeker range of LCD screens*, there is a wide range to fit your budget. Hardware Software Articles: http://www.hardwaresoftwarearticles.com/archive/index.php/
Size and resolution
There are two aspects you must consider when selecting a monitor: physical size and resolution.
Screen size is the diagonal screen measurement, usually in inches. For instance, a computer monitor display might be 14 inches wide and 11 inches tall. This same screen has a diagonal measurement of 19 inches, which is the screen size.
Monitors also have an aspect ratio.
This is the ratio between the horizontal dimension and the vertical dimension (horizontal dimension divided by vertical dimension). Common monitor aspect ratios are 4:3 (1.3333) and 5:4 (1.25). Basics: http://www.hardwaresoftwarearticles.com/archive/index.php/f-2.html
A 4:3 aspect ratio means the picture is 4 units wide for every three units of height.
Wide screen monitors are easier on the eye (and much more expensive).
The higher the resolution, the greater the ability to render more detail. If you work with graphics or enjoy graphic-intensive games, you will need a monitor with higher resolution.
With most currently available models being flat screened, the difference is in the size and picture quality. A resolution of 1024 x 768 is a good one for most users.
If you’ve decided to get a new CRT, make sure it has a sufficiently high refresh rate. This refers to how often the screen is redrawn per second. With low refresh rates you can get screen flicker and eyestrain. Virus: http://www.hardwaresoftwarearticles.com/archive/index.php/f-14.html
Aim for a rate of 75 Hz for a monitor up to 17 inches in size and 85 Hz for any larger monitor.
Another consideration for CRTs is dot pitch. The smaller the dot pitch, the sharper the image. Opt for a dot pitch of 0.26 mm or smaller.
CRTs function very well at multiple resolutions, can display detailed graphics and can be viewed comfortably from wider angles.
One of the primary disadvantages of LCDs when compared to CRTs is their limited viewing angle. When viewing a LCD straight on, it looks great. But the screen will appear washed-out if you move your head over to the side and look at it from a wider angle.
Also, LCDs are optimised to perform at a single resolution. Low-end LCDs have viewing angles of only 100 degrees, which won’t give everyone crowded round your desk a clear view.
For a standard 15-inch LCD, try to get a 140 degree viewing angle. Increase that by 20-40 degrees when shopping for an 18-inch LCD.
The brightness of LCD monitors is an important factor. LCD monitors have several backlights that provide illumination. The backlights in a LCD are good for 10,000 to 50,000 hours of operation. Ensure that the backlights come with at least a one-year warranty. Messenger: http://www.hardwaresoftwarearticles.com/archive/index.php/f-7.html
Making a choice
LCD screens generally cause lesser strain to eyes than CRT monitors.
CRTs have better graphics, but they tend to occupy five times as much space.
If you are a gaming freak, then a CRT is a better option as it is best for any graphic interface.