Monitors

What is Monitor ?
A computer monitor is an output device which displays information in pictorial form. At present, computer monitors are available in a variety of shapes, designs, and colors. However, based on the technology used to make computer monitors, they can be broadly categorized into three types.

1. CRT (Cathode Ray Tube).
2. LCD (Liquid Crystal Display).
3. LED (Light-Emitting Diodes).

CRT :

• The Cathode Ray Tube moves an electron gun to and fro across the screen. The beam collides on the phosphor dots present on the screen and emits light.
• The beam actives the pixels and makes an image on the screen.

Pro's of CRT :

• CRT monitors are affordable and cost effective.
• These monitors are highly reliable and efficient, and are capable of generating a resolution of up to 2048 x 1536 pixels.

Con's of CRT :

• CRT monitors are heavy and can occupy a great deal of work space.
• These devices get heated up very easily.

LCD :

• The cold cathode ray technology is used in LCD which emits electrons and light up the fluorescent coated monitor screen. The process is known as backlighting. 
• The second component is a  fluorescent  panel, which is made of liquid crystal. It determines the number of electrons to pass through the screen to make the shape and image of an object.

Pro's of LCD :

• These monitors are lightweight, and do not consume much desk space.
• These monitors do not consume much electricity.

Con's of LCD :

• These monitors are very expensive.
• The image quality is not constant when viewed from different angles.

LED :

• LED monitors are the latest types of monitors in the market. 
• Like LCD, it is again a flat panel display making use of light-emitting diodes for back-lightning instead of Cold Cathode Fluorescent (CCFL) back-lightning used in LCD's.

Pro's of LED :

• Lifespan and durability of LED monitors is more than CRT or LCD monitors.
• They produce images with higher contrast.
• Because of the technology, the monitor panels can be made very thin and do not produce much heat while running.

Con's of LED :

• LED monitors are little expensive than the former types.

Touch Screen Monitors :

• Touch screen monitors are used for input as well as output. It lets the user to interact with a computer by the touch of a finger rather than typing on a keyboard or moving a mouse.
• Most touch screen computers use sensors to detect touch of a finger. Touch screen is well suited for simple applications like ATM. It has also become common in department stores and supermarkets.