excellence publication co. ltd. volume 1 2.41 volume 1
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Excellence Publication Co. Ltd.Volume 1 2.4 2
A. MonitorsA. Monitors
used to display text, graphics, animation and video
There are two types of monitors:
1. Cathode Ray Tube (CRT) 1. Cathode Ray Tube (CRT) MonitorsMonitors
Excellence Publication Co. Ltd.Volume 1 2.4 3
MonitorMonitor
Monochrome CRT
Gray-scale CRT
Colour CRT
Colour Colour CapabilityCapability
One background colour and one foreground colour, e.g. Black and White
Different shades of gray
16 to more than one million different colours.
A comparison of different CRT monitorsA comparison of different CRT monitors
Excellence Publication Co. Ltd.Volume 1 2.4 4
2. Liquid Crystal Displays (LCDs)2. Liquid Crystal Displays (LCDs)
LCD is much thinner than the CRT monitor.
Consumes much less power because it works on the principle of blocking light rather than emitting it.
Excellence Publication Co. Ltd.Volume 1 2.4 5
Tips on buying MonitorsTips on buying Monitors
Screen size is measured in diagonal inchesScreen size is measured in diagonal inches
1. Identify your resolution needs.2. Know the size of monitors.3. Check the refresh rate.4. Match your graphics card.
Excellence Publication Co. Ltd.Volume 1 2.4 6
B. LoudspeakersB. Loudspeakers used to reproduce sounds
How loudspeakers workHow loudspeakers work
Voicecoil
Vibrates the diaphragm
Vibrates the air
Produce a sound wave
Excellence Publication Co. Ltd.Volume 1 2.4 7
C. PrintersC. Printers used to print characters or images on paper
1. Daisy-wheel Printer1. Daisy-wheel Printer There are different types of printers:
use hammers to press plastic or metal wheels against ribbons
Noisy
Slow speed
cannot print graphics
Excellence Publication Co. Ltd.Volume 1 2.4 8
3. Thermal Printer3. Thermal Printer
push heated pins against heat-sensitive paper
print receipts
2. Line Printer2. Line Printer
make character chains or pins and print an entire line at one time
produce low quality text
Excellence Publication Co. Ltd.Volume 1 2.4 9
4. Dot-matrix Printer4. Dot-matrix Printer
Strike pins against ink ribbons
print invoices in carbon paper and continuous form
5. Ink-jet Printer5. Ink-jet Printer Spray ink at paper
Fast speed Non-impact
Better print quality
Excellence Publication Co. Ltd.Volume 1 2.4 10
6. Laser Printer6. Laser Printer
Use lasers to produce images on drums and then print the images
Quiet
Support an almost unlimited variety of fonts
Can print both characters and images in high quality
Excellence Publication Co. Ltd.Volume 1 2.4 11
D. PlottersD. Plotters
used to draw images on paper with ink pens
There are two types of potters:There are two types of potters:
Drum Plotter Flatbed PlotterDrum Plotter Flatbed Plotter paper is wrapped around
drums with pins feeds paper is placed on flat
surface paper is moved back and
forth for one direction of plot
the size of the surface determines the maximum drawing size
Excellence Publication Co. Ltd.Volume 1 2.4 12
A Comparison between a Plotter and a PrinterA Comparison between a Plotter and a Printer
Plotter PrinterPlotter Printer draw real continuous
lines to provide infinite resolution
only simulate lines by printing closely spaced dots
usually used to produce drawings of large sizes
usually used to produce drawings of small sizes
suitable for engineering and architectural drawings
suitable for home and general office users
Excellence Publication Co. Ltd.Volume 1 2.4 13
State the reasons why many State the reasons why many
customers prefer LCD to CRT customers prefer LCD to CRT
monitor nowadays. And discuss monitor nowadays. And discuss
whether LCD would replace LRT whether LCD would replace LRT
monitors in the coming five years.monitors in the coming five years.
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