WWS Technology Wiki




The monitor is a hardware on a computer that displays the graphics as well as information received from the video card. For desk top monitors there is a cable that connects the monitor to a port on the motherboard or Video Card on the computer. Monitors are typically LCD. Through the use of active matrix technology little transistors and capacitors create a matrix via a thin film transistor. The other technology used by LCD monitors is the passive matrix technology. In passive matrix tech, conducting metals create a grid which charges every pixel. LCD monitors that use a passive matrix display are less expensive, yet are hardly used anymore because of how slow they can be. A CRT monitor (Cathode-ray tube) has millions and millions of tiny phosphor dots which, when hit by an electron beam that traveled across the screen, creates an image. These dots are red, green, and blue. Anode and Cathode are the positive and negative terminals. The heat filament in CRT is the cathode. A glass tube contains this cathode. A current of electrons created by an electron gun pours the heat cathode inside a vacuum. This is the ray. Because electrons are negative and anodes positive, the electrons are attracted when the cathode is being poured. The glow from the screen is a result of phosphor being hit by the electron beam. The monitor sometimes gets its power from a source in the wall, but it sometimes gets it from the power supply. History of the display:

~1981 the Color Graphics Adapter is released by IBM. It could display four colors, and the resolution was 320 pixels by 200

~1984 the Enhanced Graphics Adapter is introduced by IBM. There is now 16 colors and 620 X 350 pixel resolution

~1987 Video Graphics Array is introduced by IBM. 640 X 480 pixel resolution

~1990 Extended Graphics Array


introduced by IBM. 800 X 600 pixel resolution, with 16.8 million colors . There was also 1,024 X 768 resolution with 65,536 colors.

Color Graphics Adapter

CRT Monitor