Output Devices

By:Matthew Goga

-Monitors

-Printers

-Projektor

-What is plotter?

-What about handicap people?

Cathode ray tube.This tube is a vacuum containing electron gun. and a fluorescent screen. Which uses electron beam used to create image.Color of CRT have separate three electron guns.

Plasma is a type of monitors made form layers with gas between them.Many tiny cells between two glass panels hold an mixture of noble gasses.This gas is electricaly turned into plasma.

Liquid Crystal Display.It is an electronically-modulated optical device. It's shape is a thin, flat. panel made up of any number of colors or monochrome pixels.This pixels are filled with liquid crystals. This LCD uses very small amounts of electric power.

A laser printer is a type of computer printer that produces text and graphics on plain paper of high quality. A laser beam projects an image of the text or picture which is going to be printed on electrically charged rotating drum coated with selenium. Photoconductivity removes the charge from the areas exposed to light. Toner particles are then electrostatically picked up by the drum's charged areas. The drum then prints the image on the paper by direct contact. Which uses heat, which fuses the ink to the paper.

Most common type of printer is Inkjet printer. There are three types of inkjet printers.One of them is Thermal inkjets. Other two are Piezoelectric inkjet and Continuous ink jet

Again there are several types of projektor.Video projektor ,Lcd and laser projektors.

A video projektor takes a video signal and projects the corresponding image on a projection screen through lens system

This projectors sends light from a Metal halide lamp through a prism that separates light to three poly silicone panels.

A plotter is a graphics printing device that prints graphical plots. Connected to a computer. There are several types of plotters. The main is pen plotter

Pen plotters print by moving a pen across the surface of a piece of paper

http://www-tc.pbs.org/nbr/site/images/blue-background.jpg

http://images.google.sk/images?hl=sk&ei=EjSsSdmGKpmC1QXK-aHMAg&resnum=0&q=computer%20hardware%20for%20handicap%20people&um=1&ie=UTF-8&sa=N&tab=wi

http://en.wikipedia.org/wiki/Output_devices