### What is Monitor ?
A monitor is an electronic visual computer display that includes a screen, circuitry and the case in which that circuitry is enclosed. The monitor is the commonly used display device. A computer monitor is an output device which displays information in pictorial form. A monitor usually comprises the display device, circuitry, casing, and power supply.
The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) with LED backlighting having replaced cold-cathode fluorescent lamp (CCFL) backlighting. Older monitors used a cathode ray tube (CRT).
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Monitors are connected to the computer via VGA, Digital Visual Interface (DVI), HDMI, Display Port, Thunderbolt, low-voltage differential signaling (LVDS) or other proprietary connectors and signals.
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### CRT Monitor :
CRT monitors generally produce images by the raster-scan method. In this method, an electron beam with varying intensity, is moved back and forth horizontally across the face of the monitor. As the beam is directed to each spot on the phosphor coated screen, it illuminates the spot in proportion to the voltage applied to the beam.
Each spot represents a picture element or pixel. One can see a complete image. The image that can be seen is the one traced on the retinas of eyes by the light beam. However, this image will fade unless it refreshed. Thus, the electron beam must scan the screen very rapidly (at least 60 times per second) so that the intensity of the image remains
Approximately the same and the screen does not appear to flicker. The screen resolution of a monitor is determined by the number of pixels making up the screen. Monitors are currently available with 64,000 to more than 2 million pixels per screen. The greater the resolution of a monitor the greater is the storage demand on the computer.
### Monochrome or Color :
Some monitors display images in only one color while others are capable of producing images in colors. Monochrome monitors use single electron beam and display one color, generally green, amber, or white, on a black background. The phosphor composition of the screen determines the color. Color monitors produce multi-color images by combining the red ,blue and green colors in varying intensities. Color monitor are categorized as CGA, EGA, VGA and SVGA depending on the resolution. CGA monitors provide the least resolution and SVGA monitors provide the greatest resolution (1024 x 768 pixels and more).
### Monitor Interface :
A monitor requires an appropriate interface to communicate with a computer. For example, a color graphics interface board is needed for a color monitor. This interface may not work with a monochrome monitor. A variety of monitor interface boards are available for use with micro computers.
### LED Monitor :
An LED monitor (short for Light Emitting Diode) or LED display is a flat screen, flat panel computer monitor or television. It has a very short depth and is light in terms of weight. The actual difference between this and a typical LCD monitor is the backlighting. The first LCD monitors used CCFL instead of LEDs to illuminate the screen.
### LCD Monitor :
A liquid crystal display (LCD) monitor is a computer monitor or display that uses LCD technology to show clear images, and is found mostly in laptop computers and flat panel monitors. This technology has replaced the traditional cathode ray tube (CRT) monitors, which were the previous standard and once were considered to have better picture quality than early LCD variants.
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