Peripheral devicesOutput devices

Types of Output

Output is data that has been processed into a useful form called information. Report Computer Graphics Audio Output Video Output

Types of Output

Most output can be divided into 2 categories: Soft copy & hard copy. Soft copy is what you see on the monitor. Soft

copy is temporary. Hard copy can be touched and carried. Hard copy

is usually some form of paper output.

MonitorsA visual output device of a computer.Monitor output is a most common form

of soft copy.

CRT Monitor Flat-panel Monitor

RGB Color

similar to a TV, use a cathode ray tube.

This is one RGB pixel of light R + B = M (magenta)B + G = C (cyan)G + R = Y (yellow)R + G + B = W (white)

Resolution of Display Images on the screen are created by

configurations of dots called pixels (picture elements)

The more the pixels, the better the resolution of the image

o VGA (Video Graphics Array) = 640 x 480 pixelso SVGA (Super Video Graphics Array) = 800 x 600 pixelso XGA (Extended Graphics Array) = 1024 x 768 pixels

PrintersProduce permanent output (hard copy)consists of 2 main types: impact & non-

impactTypes Impact Printers Non-impact PrintersMechanisms Transfer an image by

striking the paper andthe ribbon.

Print without strikingagainst a sheet of paper.

Advantages Cheap consumables;Can print on multiplecarbon copies

Fast;High printing quality;Quiet

Disadvantages Noisy Expensive consumable

Impact Printers

Line printers they can produce only text--no graphics.

Chain printersDot Matrix Printers

The most common character printers create images by using a dot pattern.

Non-impact PrintersLaser Printer

work in the same manner as copy machines; a laser beam creates electrical charges that attract toner to form an image and transfer it to paper.

Color Laser Printer

Laser Printer

Inkjet Printers significantly less expensive than laser

printers relatively low resolution Electronically charged ink is sprayed

through a jet nozzle and passed through an electronic field, which deflects the ink to form a dot-matrix character

Inkjet printer CMY color

This is one CMY pixel of ink

C + M = B (blue)M + Y = R (red)Y + C = G (green)C + M + Y = B (black)

Other Output Devices

Plotter produce high-quality line

drawings A continuous-curve plotter is

used to draw maps from stored data.

LCD Projectors project a computer image onto screen

Voice Output Devices generate spoken words from text

Computer Output microfilm (COM) records output as microscopic images on roll film.

Facsimile (FAX) Machine transmit & receives document over telephone line.

Multifunctional Devices (MFD) can print, copy and fax