Display adapters

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Introduction

• Display adapter is a circuit board.

• This is used to convert the raw data to image data

(video signal) that can be displayed on the monitor.

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Convert the raw data to image

Raw DataRaw Data Display Adapter card

Display Adapter card

Image DataImage Data

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Display adapters

The following are the important display adapters

• VGA

• SVGA

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VGA

• This display adapter was introduced in 1987 by IBM.

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Features of VGA

• It offers 640 x 480, flers 640 x 360, and 320 x 200 pixels in 16

colors and 320 x 200 in 256 colors

• It has a selectable 25.175 MHz or 28.322 MHz master clock

• It has a 256 KB of video RAM

• It produces high quality text and graphics in 64 colors from a

palette of 256 colors

• Its refresh rate is 70Hz

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Cont.,

• It supports split screen. That is, a display technique used

to divide the graphics and text into two or four

rectangular area

• It supports smooth scrolling of text or images across the

display.

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VGA Pin connection

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SVGA

• This display adapter was introduced in 1989 standard

association by video electronics

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Features of SVGA

• It offers very high resolution of 800 x 600 and 1024 x 768 pixels in

16 colors

• It supports both graphics and text mode

• It has 0.5 MB or 1 MB video buffer RAM

• It offers 32 bit interface

• It offers wide range of colors (256 colors)

• It supports VESA BIOS extensions

• It supports multimedia

• It supports Microsoft Windows that allows more icons and folders

on the screen without having to scroll.www.ustudy.in

Pin connection of SVGA

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Flickering• Flickering is nothing but unsteadiness present in the

display area of the monitor.

• When we view the flickering monitor for long period, it

causes more eye strain

• Flickering is caused by low refresh rate setting for the

monitor.

• Normally windows by default set our monitor refresh rate

by 60Hz.

• This may not be sufficient and this leads to flickering.www.ustudy.in

Flickering of a Monitor

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Change the refresh rate in Windows XP

• Right click an empty area on the desktop and select

Properties. Display properties dialog box appears

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Cont.,

• Select setting tab

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Cont.,• Click the Advanced button. Plug and Play monitor

dialog box appear.

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Cont.,

• Click on the monitor tab

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Cont.,• From the screen refresh rate select 75 or 85 Hz

• Click Apply. The setting will be saved

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Demagnetizing

A monitor gets magnetized because of the following reasons

• When the monitor is moved or just rotated

• When there is a lightning strike nearby

• When a permanent magnet is brought near the screen

• When a piece of electrical or electronic equipment

without cover is brought near the monitor

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Demagnetize of a monitor

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Cont.,• Magnetizing causes color problems in the display.

• Therefore we have to demagnetize the monitor for clarity.

• By following the steps given bellow we can demagnetize the

monitor.

• Most modern monitors demagnetize automatically when it is

turned on every time.

• This can be confirmed by a doing sound every time monitor

switched on.

• If we didn’t hear this sound, the monitor may not demagnetize

automatically.

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Cont.,

• If not demagnetize automatically, open the on-screen

menu using the button present in front of the monitor.

• Locate the degause option and select it.

• Now the monitor gets demagnetized

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Precautions of Demagnetize

• Use demagnetizing whenever needed.

• If used oftenly the degaussing coil may get and burnt off.

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Cont.,

• Don’t try to demagnetize by opening the back overheated

and burnt off

• Don’t try to demagnetize with the help of permanent

magnet. Sometime it may cause more problems.

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The End

….. Thank you….

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