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COMPUTER STUDIES Standard Grade

COMPUTER STUDIES Standard Grade. OUTPUT DEVICES Chapter 17. Drum. Flatbed. FOUNDATION. P R I N T E R S. Laser Printer High quality printouts - can be in colour or B&W. Many pages can be printed very quickly. Toner is used to display the image on paper. Inkjet Printer Colour printouts

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COMPUTER STUDIES Standard Grade

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  1. COMPUTER STUDIESStandard Grade OUTPUT DEVICES Chapter 17 Computing

  2. Drum Flatbed FOUNDATION PRINTERS Laser Printer • High quality printouts - can be in colour or B&W. • Many pages can be printed very quickly. • Toner is used to display the image on paper. Inkjet Printer • Colour printouts • Excellent photograph quality • Slower to print but less expensive • Uses ink cartridges • Plotter • Colour pens move up & down • Used with CAD packages Computing

  3. CRT Ergonomic monitor Monitors / VDUs • A computer video signal is received then the image is displayed on a screen • More pixels per inch means a higher resolution • A high resolution monitor displays high quality images FOUNDATION Computing

  4. MONITOR / VDU LCD: LIQUID CRYSTAL DISPLAY • 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 • 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

  5. 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. GENERAL Computing

  6. 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) Computing GENERAL

  7. SPEECH SYNTHESISER Press a key to hear the word spoken for the picture VR Headset / VR Visor Goggles for video Headphones for sound CREDIT Specialised Output devices for Disabled users Virtual Reality output Computing

  8. HIGH QUALITY VDU NEEDED FOR ANIMATION & MOVIE OUTPUT Multimedia Projector White Board HIGH QUALITY SOUND OUTPUT HIGH QUALITY SCREEN DISPLAY Speakers Headphones CREDIT MULTIMEDIA Computing

  9. Graphics Card IMPROVES SOUND QUALITY OF GAMES & MULTIMEDIA APPLICATIONS VGA (CRT) output ViVo (video in/video out) DVI (Digital Output) CONTROLS THE QUALITY OF OUTPUT ON A MONITOR Sound Card Multimedia continued CREDIT Computing

  10. And there are more…. Exciting chapters to follow So tune in again next time Computing

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