December 8, 2010

 Monitor

No comments
Monitor is also known as VDU (Visual Display Unit) or Screen. It is Similar  to  a  television, monitor  is a commonly used output device. A Keyboard is used to input data and receive massages from the computer. Whatever is typed on keyboard gets displayed on the monitor. The monitor displays text, pictures, graphics and other items from the computer on a screen.  A monitor has its own box which is separated from the main computer system and it is connected to the computer by cable. A basic monitor displays up to 24 lines of 80 columns of standard characters..

There are different types of monochrome (single color) and color monitors available in the market.

(i) Monochrome Graphics Adopter (MGA):
It works as a color graphics adopter without a color card.

(ii) Monochrome Display Adopter (MDA):It does not have color or graphics capability. It can display only text characters in one color, bright or dim underlined in the reverse image.

(iii) Color Graphic Adopter (CGA):It can display both text and graphics. It can display upto 16 different colors. It cannot display text characters clearly as the MDA.

(iv) Enhanced Graphics Adopter (EGA) :It can also perform in its own modes display upto 64 colors and monochrome graphics and text characters.

(v) Herculer Graphics Adopter (HGA) :It can produce both quality text images and very high revolution of color graphics. It can display only 2 colors of graphics.

(vi) Visual Graphics Adopter (VGA):It has a range of high resolution. It also supports upto 256 colors of grey. Today the upper end varieties of this adopter called super Visual Graphics Adopter (SVGA) are also available.


There are different types of computer monitors  available  in a variety of colors, shapes and designs

Look at the Three main types of monitors:
1) CRT (Cathode Ray Tube monitor)
2) LCD monitor (Liquid Crystal Display)
3) TFT monitor (Thin Film Transistor)

CRT Monitor (Cathode Ray Tube):



CRT stands for cathode ray tube. The cathode ray tube made up of metal and glass. Cathode Ray Tube technology was invented more than 100 years ago. A CRT monitor contains millions of tiny red, green, and blue phosphor dots. It uses the pixels created to project an image on the screen. The CRT monitor comes in 15 inch to 21 inch sizes and larger, It looks like TV screen. It resolution up to 2048 x 1536 pixels.

-> Measuring Quality of CRT Monitor
The quality of CRT monitor depends on the following factors.
i)   Resolution
ii)  Dot pitch
iii) Refresh rate

- Different types of CRT Monitors measurements
Screen Size (Diagonal)
Width (inches)
Height  (inches)
9”
7.2
5.4
14”
11.2
8.4
15”
12.0
9.0
17”
13.6
1.2
21”
16.8
12.6




- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

LCD Monitor (Liquid Crystal Display) :

In 1888, the Austrian botanist Friedrich Reinitzer discover liquid crystals. This type of monitors based on LCD (liquid crystal display) technology. LCD also called flat panels.   LCD monitor is also called an Flat Panel Monitor because they are flat and thin. Liquid Crystal Displays are smaller size and use less energy than a CRT (cathode ray tube) monitor. These types of monitors are most popular for flat panel desktop monitors.

- Different types of LCD Monitors Size and  Resolution.

LCD Size
Resolution
13.5”
800X600
14.5”
1024X768
18”
1600X1200





- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

TFT Monitor (Thin Film Transistor) : 


It Stands for Thin Film Transistor. TFT monitor that uses thin film transistor (TFT) technology. The color per pixel is due to the frequency of power put through the pixel. TFT technology is much secure, reliable and generates better picture quality.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

- Different types of Display Standards :





MDA
Monochrome Display Adapter
CGA
Color Graphics Adaptor
EGA
Enhanced Graphics Adaptor
VGA
Video Graphics Array
SVGA
Super Video Graphics Array
WVGA
Wide Video Graphics Array
FWVGA
Full Wide Video Graphics Array
QVGA
Quarter Video Graphics Array
WQVGA
Wide Quarter Video Graphics Array
HQVGA
Half  Quarter Video Graphics Array
QVGA
Quarter Video Graphics Array
HVGA
Half-size Video Graphics Array
WSVGA
Wide Supper Video Graphics Array
XGA
Extended Graphics Array
WEGA
Wide Extended Graphics Array
SEGA
Super Extended Graphics Array
UEGR
Ultra Extended Graphics Array
WUXGA
Wide Ultra Extended Graphics Array
QEGA
Quad Extended Graphics Array
WQXGA
Wide Quad Extended Graphics Array
QWXGA
Quad Wide Extended Graphics Array
QSXGA
Quad Super Extended Graphics Array
WQSXGA
Wide Quad Super Extended Graphics Array
QUXGA
Quad Ultra Extended Graphics Array)
WQUXGA
Wide Quad Ultra Extended Graphics Array
HXGA
Hex Extended Graphics Array
WHXGA
Wide Hex Extended Graphics Array
HSXGA
Hex Super Extended Graphics Array
WHSXGA
Wide Hex Super Extended Graphics Array
HUXGA
Hex Ultra Extended Graphics Array
WHUXGA
Wide Hex Ultra Extended Graphics Array
WQHD
Wide Quad High Definition
QFHD
Quad Full High Definition


- Display Standards Color and Resolutions (in pixels)

Display
Resolution
Color
MDA
720x350
1
VGA
640x480
16
XGA
1024x768
8 bits 256
16 bits 65,536
SVGA
800x600
1024x768
1280x1024
1600x1200
16.7 million
16.7 million
16.7 million
16.7 million
SXGA
1280 x1024
16.7 million
WSXGA
1600 x 1024
16.7 million
UXGA
1600x1200
16.7 million
WUXGA
1920x1200
16.7 million

Tags: ,,,,,,,,,,,,,,,

0 comments:

Post a Comment

Your Ad Here
RSS FeedSubscribe
Follow me!Follow me!
FacebookBe Our Fan