Volume 1 2. 4 1 Excellence Publication Co. Ltd.
A. Monitors There are two types of monitors: 1. Cathode Ray Tube (CRT) Monitors Volume 1 2. 4 2 Excellence Publication Co. Ltd.
A comparison of different CRT monitors Colour Capability Monitor Monochrome CRT One background colour and one foreground colour, e. g. Black and White Gray-scale CRT Different shades of gray Colour CRT Volume 1 2. 4 16 to more than one million different colours. 3 Excellence Publication Co. Ltd.
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. Volume 1 2. 4 4 Excellence Publication Co. Ltd.
Screen size is measured in diagonal inches Tips on buying Monitors 1. Identify your resolution needs. 2. Know the size of monitors. 3. Check the refresh rate. 4. Match your graphics card. Volume 1 2. 4 5 Excellence Publication Co. Ltd.
B. Loudspeakers used to reproduce sounds How loudspeakers work Voice coil Vibrates the diaphragm Produce a sound wave Volume 1 2. 4 6 Vibrates the air Excellence Publication Co. Ltd.
C. Printers used to print characters or images on paper There are different types of printers: 1. Daisy-wheel Printer use hammers to press plastic or metal wheels against ribbons Slow speed Noisy cannot print graphics Volume 1 2. 4 7 Excellence Publication Co. Ltd.
2. Line Printer push heated pins against heat-sensitive paper produce low quality text 3. Thermal Printer make character chains or pins and print an entire line at one time print receipts Volume 1 2. 4 8 Excellence Publication Co. Ltd.
4. Dot-matrix Printer Strike pins against ink ribbons print invoices in carbon paper and continuous form 5. Ink-jet Printer Spray ink at paper Non-impact Fast speed Better print quality Volume 1 2. 4 9 Excellence Publication Co. Ltd.
6. Laser Printer Use lasers to produce images on drums and then print the images Support an almost unlimited variety of fonts Can print both characters and images in high quality Quiet Volume 1 2. 4 10 Excellence Publication Co. Ltd.
D. Plotters used to draw images on paper with ink pens There are two types of potters: Drum Plotter paper is wrapped around drums with pins feeds paper is moved back and forth for one direction of plot Volume 1 2. 4 Flatbed Plotter paper is placed on flat surface the size of the surface determines the maximum drawing size 11 Excellence Publication Co. Ltd.
A Comparison between a Plotter and a Printer Plotter Printer draw real continuous lines to provide infinite resolution only usually used to produce drawings of large sizes usually suitable engineering for and simulate lines by printing closely spaced dots used to produce drawings of small sizes suitable for home and general office users architectural drawings Volume 1 2. 4 12 Excellence Publication Co. Ltd.
State the reasons why many customers prefer LCD to CRT monitor nowadays. And discuss whether LCD would replace LRT monitors in the coming five years. Volume 1 2. 4 13 Excellence Publication Co. Ltd.
Back Volume 1 2. 4 14 Excellence Publication Co. Ltd.
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