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Computer Maintenance What does “CRT” stand for? 1Copyright © Texas Education Agency, 2011. All rights reserved.
CRT Cathode ray tube (CRT) 2 All CRT monitors have a cathode ray tube (CRT), which is a vacuum tube One end of this tube is a slender cylinder that consists of three electron guns The wide end of the CRT is the display screen Copyright © Texas Education Agency, 2011. All rights reserved.
Warning Opening up a monitor can be deadly! Even when the power is disconnected, certain components inside a monitor retain a substantial voltage for an extended period of time. If you accidentally short one of the components, it could actually kill you! 3Copyright © Texas Education Agency, 2011. All rights reserved.
CRT When power is applied to one or more of the electron guns, a stream of electrons is generated This stream is subjected to a magnetic field generated by a ring of electromagnets called a yoke The phosphor coating, when struck by the electron beam, releases energy as visible light The phospors continue to glow momentarily after being struck – called persistence. 4Copyright © Texas Education Agency, 2011. All rights reserved.
CRT Refresh Rates Horizontal Refresh Rate (HRR) The speed at which the electron beam moves across the screen Vertical Refresh Rate (VRR) The amount of time taken by the monitor to draw the entire screen and get the electron beam back to the start 5 Video data is displayed on the monitor as the electron gun sweeps the display horizontally, energizing appropriate areas on the phosphor coating. Copyright © Texas Education Agency, 2011. All rights reserved.
CRT Refresh Rates 6Copyright © Texas Education Agency, 2011. All rights reserved.
Resolution Monitor resolution is always shown as the number of horizontal pixels times the number of vertical pixels Some common resolutions are 640X480, 100X600,1024X768, 1280X1024, and 1600X1200 These resolutions match a 4:3 ratio called the aspect ratio 7Copyright © Texas Education Agency, 2011. All rights reserved.
CRT Connections CRT monitors use a 15-pin, 3 row, DB type connector, and a power plug 8Copyright © Texas Education Agency, 2011. All rights reserved.
Do’s and Don’ts Do keep the screen clean Do keep the cables tightened Do use quality cabling Do use power management Do dispose of monitors properly by checking with your local waste disposal company Don’t block the ventilation slots Don’t use a refresh rate higher than recommended Don’t leave the monitor on all the time – even with a screen saver Don’t place magnetic objects like unshielded speakers close to the monitor 9Copyright © Texas Education Agency, 2011. All rights reserved.
Introduction to Graphical Hardware Display Technologies CRTs are the most common display device today Evacuated glass bottle (last remaining vacuum tube)
1 Objectives Objectives Explain how video displays work Explain how video displays work CRT and LCD monitors Understand the concept of resolution Understand.
Display Devices Display Devices Display Hardware Components of CRT Components of CRT Refresh CRT Refresh CRT Electron Gun Focussing system.
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A phosphor is any material that, when exposed to radiation, emits visible light. The radiation might be ultraviolet light or a beam of electrons. Any fluorescent.
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Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill Technology Education Copyright © 2006 by The McGraw-Hill Companies,
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