Monitor
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.
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)
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 |
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LCD Monitor (Liquid Crystal Display) :
- 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.
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- 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 |
