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Figure 152
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Electron stream in the CRT
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Several manufacturers still make CRT monitors, but only a couple of companies make the CRT the tube inside the monitor itself All CRT tubes can be categorized into two types: traditional curved-screen CRTs and CRTs that are often referred to as perfect flat using a kind of vacuum tube that has a completely flat screen and no bending around the edges The perfect flat screens offer a wider viewing angle than standard CRT screens About the only negative to the perfect flat screens is that they tend to lack true black, so pictures seem just shy of a natural richness of color and contrast
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stream is subjected to magnetic fields generated by a ring of electromagnets called a yoke that controls the electron beam s point of impact When struck by a stream of electrons, a phosphor quickly releases a burst of energy This happens far too quickly for the human eye and brain connection to register Fortunately, the phosphors on the display screen have a quality called persistence , which means the phosphors continue to glow after being struck by the electron beam Too much persistence and the image is smeary; too little and the image appears to flicker The perfect combination of beam and persistence creates the illusion of a solid picture
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The monitor displays video data as the electron guns make a series of horizontal sweeps across the screen, energizing the appropriate areas of the phosphorous coating The sweeps start at the upper-left corner of the monitor and move across and down to the lower-right corner The screen is painted only in one direction; then the electron guns turn and retrace their path across the screen, to be ready for the next sweep These sweeps are called raster lines (see Figure 153) The speed at which the electron beam moves across the screen is known as the horizontal refresh rate (HRR) , as shown in Figure 154 The monitor draws a number of lines across the screen, eventually covering the screen with glowing phosphors The number of lines is not fixed, unlike television screens, which have a set number of lines After the guns reach the lower-right corner of the screen, they turn off and point back to the upper-left corner The amount of time it takes to draw the entire screen and get the electron guns back to the upper-left corner is called the vertical refresh rate (VRR) , shown in Figure 155 The monitor does not determine the HRR or VRR; the video card pushes the monitor at a certain VRR and then the monitor sets the corresponding HRR If the video card is set to push at too low a VRR, the monitor produces a noticeable flicker, causing eyestrain and headaches for users
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Figure 153
Electron guns sweep from left to right
Figure 154
Horizontal refresh rate
Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
Figure 155
Vertical refresh rate
Pushing the monitor at too high of a VRR, however, causes a definite distortion of the screen image and will damage the circuitry of the monitor and eventually destroy it The number one killer of monitors is improper VRR settings, and the number one reason your office is filled with crabby workers is due to the VRR being set too low All good PC support techs understand this and take substantial time tweaking the VRR to ensure that the video card pushes the monitor at the highest VRR without damaging the monitor this is the Holy Grail of monitor support!
Try This!
Discovering Your Refresh Rate
You should know the refresh rate for all CRTs you service Setting up monitors incorrectly can cause havoc in the workplace, so Try This! 1 Most PCs have two places where you can discover the current refresh rate of the monitor Many monitors offer a menu button for adjusting the display Often it will show the refresh rate when pushed once If that doesn t work, go to the Control Panel and open the Display applet Select the Settings tab and then click the Advanced button Select the Monitor tab in the Monitor Properties dialog box Write down your refresh rate How does it compare with that of your classmates
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