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Week2-Computer_Graphic_System1 - Display Technologies Types...

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Display Technologies
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Types of video display Cathode Ray Tubes (CRTs) TVs, RGB monitors, o-scopes Flat-Panel Displays PDAs, laptops, calculators, digital watches
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CRTs Electrons are fired from a filament, focused, accelerated, then deflected to a point on the phosphor coating on the inside of the display screen
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Random-scan CRTs Electron beam is scanned along each line segment Capable of displaying continuous lines and very high resolution curves High-end displays capable of 100k lines per refresh
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Random-scan CRTs Pros - Excellent for line drawings - Generally high resolution Cons - Can not display realistic shaded images - Not capable of color Common Example Oscilloscopes
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Raster-scan CRTs Electron beam is scanned left-to-right, top-to-bottom Beam retraces to top-left after reaching bottom- right (vertical retrace) Capable of displaying continuous range of intensities at discrete positions High-end displays capable of 4k x 4k @ 120 Hz
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Raster-scan CRTs Three electron guns are used, one for each color The guns are aimed through a mask and onto colored phosphors Colored phosphors are arranged in RGB triples dots (delta) – RGB monitors stripes (inline) – TVs, Sony Trinitron
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