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COMPUTER STUDIES Standard Grade OUTPUT DEVICES Chapter 17 Standard Grade Computing PRINTERS Laser Printer • High quality printouts - can be in colour or B&W. • Many pages can be printed very quickly. Drum • Toner is used to display the image on paper. Inkjet Printer Plotter • Colour printouts • Colour pens move up & down • Excellent photograph quality • Used with CAD packages • Slower to print but less expensive • Uses ink cartridges Standard Grade FOUNDATION Computing Monitors / VDUs • A computer video signal is received then the image is displayed on a screen • More pixels per inch means a higher resolution CRT Ergonomic monitor • A high resolution monitor displays high quality images Standard Grade FOUNDATION Computing MONITOR / VDU CRT: CATHODE RAY TUBE • Inside the flat end is coated with substances which glow when hit by electrons • The coating has red, green & blue dots which glow to produce the colours needed Standard Grade LCD: LIQUID CRYSTAL DISPLAY • Transistors charge liquid crystals between two glass plates. • Fluorescent tubes provide the light source, which passes through a layer of crystals. • Varying the electrical charge to the crystals creates images. GENERAL Computing MONITOR / VDU continued TFT: THIN FILM TRANSISTOR • LCD TFT monitors emit less radiations than a Standard LCD. • AND emit MUCH less radiation than a CRT monitor! • TFT also gives a picture up to an 80 degree angle. • where as a LCD only goes to about a 45 degree. • TFT also gives a sharper picture. Standard Grade GENERAL Computing • Comparing Printers Capital Costs Determined by the quality of hardware bought e.g. laser or inkjet printer? CRT or LCD monitor • Running costs Determined by what is used to operate the hardware e.g. printer paper amount & quality, ink or toner? • Speed How many pages are printed per minute (ppm) • Resolution Determined by how many pixels or dots are present in each inch (dots per inch - dpi) Standard Grade GENERAL Computing Specialised Output devices for Disabled users Press a key to hear the word spoken for the picture VR Headset / VR Visor Virtual Reality output Standard Grade CREDIT Computing MULTIMEDIA HIGH QUALITY VDU NEEDED FOR ANIMATION & MOVIE OUTPUT Multimedia White Board Projector HIGH QUALITY SCREEN DISPLAY HIGH QUALITY SOUND OUTPUT Standard Grade CREDIT Computing Multimedia continued Graphics Card VGA (CRT) output ViVo (video in/video out) IMPROVES SOUND QUALITY OF GAMES & MULTIMEDIA APPLICATIONS DVI (Digital Output) CONTROLS THE QUALITY OF OUTPUT ON A MONITOR Standard Grade Sound Card CREDIT Computing And there are more…. Exciting chapters to follow So tune in again next time Standard Grade Computing