A CRT monitor is an analog computer monitor. The term CRT means “cathode ray tube” and it indicates the kind of technology that is used in this type of monitor, which is the same as that of a traditional TV set. Identifying a CRT monitor is easy because of its bulk as opposed to newer technologies like LCD and Plasma monitors and TV sets which have flat display panels.
A CRT monitor produces an image based on the myriad lines of tiny colored dots. Although these dots are sometimes refered to as pixels they are not the same. The picture quality gets better the more dots there are per inch. The more dots means higher resolutions and, ultimately, a better and clearer picture. Getting a high resolution image is crucial if one wants to see more details on the graphics and appreciate the subtle details of a picture.
The CRT monitor comprises of a picture tube that is wide where the display is but tapers off at the rear. Inside the narrowest point is a negatively charged filament or cathode that has been put inside a vacuum. When powered, the filament begins to heat up and a stream of electrons are emitted from the filament and into the vacuum. Negatively charged electrons are attracted to the anodes, positively charged particles. This helps focus the particles into three beams that strikes the phosphor coated screen. The phosphor begins to glow. Phosphors that produce red, green and blue light are arranged like stripes. The three beams will agitate the three colors and combine to produce different other hues in order to form a picture.