TAILIEUCHUNG - Lecture Introduction to computing - Lecture 6

This lesson introduces you to monitors and sound systems. You will learn about the different types of monitors commonly used with computers and how they work. You also w ill learn some important criteria for judging a monitor's performance. This lesson also shows you how computers can ourput sounds. | CSC 101 Introduction to Computing Lecture 6 Dr. Iftikhar Azim Niaz ianiaz@ 1 2 Last Lecture Summary I Ergonomics and input devices Repetitive Stress Injuries Carpel Tunnel Syndrome Avoiding Keyboard related injuries How to sit at a computer Techniques to avoid RSI 2 3 Last Lecture Summary II Alternate Input devices Devices for the hand Pen, Touch Screens Game controllers Joystick Game pad Optical Input Devices Bar Code Reader, Image Scanners, OCR Audio Input devices Microphone, Sound Card, MIDI Video input devices Video Camera, Web Cam, Digital Camera 3 Output Devices Display screens were uncommon till 1960’s Now, computers can communicate information to you in several ways Reading, Seeing, watching and listening Modern display and sound systems computers are easier to use data is easier to manage, and information is easier to access Monitors and Sound Systems 4 Outline Two most commonly used types of computer monitors. How a CRT monitor displays images? Two types of flat-panel monitors and explain their differences. Various characteristics for comparing monitors. How data projectors are used? How a computer outputs sound? 5 Monitors Most common output device Connects to the video card or controller Two types Cathode Ray Tube (CRT) Flat-panel Categorized by color output Monochrome One color with black background Grayscale Varying degrees of gray Color Display 4 to 16 million colors 6 Cathode Ray Tube (CRT) Most common type of monitor 7 How CRT creates an image Electron gun shoots streams of electrons towards the screen. Magnetic yoke guides the streams of electrons across and down the screen. Phosphor dots on the back of the screen glow when the electron beams hit them. 8 Parts of CRT Monitor 9 How CRT monitor works 10 CRT Color Phosphor dots arranged in triads Red, green, and blue dots Three colors blend to make colors Varying the intensity creates new colors Exercise Custom color with MS Paint 11 11 Teaching tip Unless your students have spend a .

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