MONITOR
What is Monitors & Types of Monitor?
It is the most important output device. The combination of the keyboard and monitor is called as Video Display Unit . The Monitor is divided into 25 rows and 80 columns . The screen is made of several small dots, which are called as pixels. The more the number of pixels the more is the resolution of the monitor.
The clarity of a picture depends on three facts.
(i) Resolution of Screen
(ii) Dot Pitch
(iii) Refresh Rate
Types of Monitor
■ CRT Display
CRT stands for Cathode Ray Tube . The main components of a CRT terminal are the electron gun , the electron beam controlled by an electromagnetic field and a phosphor coated display screen . The electron gun emits an electron beam which is directed toward the phosphor coated display by electromagnetic field in order to create in image . The quality of display is indicated by the resolution of the display device. Resolution is determined by the number of pixels horizontally and vertically. Typical resolution in graphic display resolution in graphic display range from ( 640 x 480 ) pixels to ( 1024 x 768 pixels .
There are different types of CRT displays
- CGA ( Color Graphics Adapter )
- MGA ( Monochrome Display Adapter )
- HGA ( Hercules Graphics Adapter )
- EGA ( Enhanced Graphics Adapter )
- VGA ( Video Graphics Adapter )
- SVGA ( Super VGA )
- Liquid Crystal
■ LCD (Liquid Crystal Display )
LCD is a type of commonly used output device. It is a much lighter but costlier output device than a CRT. It is used in laptops, notebooks, personal computers, digital watches, etc. LCD has two plates. A special type of liquid is filled between these plates. When light comes out from behind the plate, the fluid inside the plates aligns and glows, giving the picture visible.
■ LED(Liquid / Light Emitted Diode)
This monitor is used like a television in homes nowadays. Small LEDs (Light Emitted Diodes) are installed inside it. When electric current passes through these LEDs, these LEDs start glowing and the picture appears on the screen of the LED.
■ 3D monitors
3D monitors use to view the output in three dimensions ( Three Dimension - 3D)
■ TFT (Thin Film Transistor )
TFT consists of one to four transistors to control a pixel. These transistors make the screen much brighter, brighter and more colorful than the passive matrix. TFT is an output device capable of displaying an expensive but high quality picture compared to other monitors.
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