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Raster Graphics Display Hardware
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Cathode Ray Tube (CRT)
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Inside a CRT Phosphor's light output decays exponentially; refresh at >= 60Hz 3
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Liquid Crystal Display (LCD)
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Inside an LCD Mirror: makes it reflective
Back Polarizing Film: filters light, allows only certain light with desired direction to pass Back Glass Filter: transistors and capacitors at each pixel to change the voltage that bends the light Liquid Crystal Layer: controls direction of light Negative and Positive Electrodes: hooked up to a power source. No current light hits the mirror and bounces back out. With current the liquid crystals between the common-plane electrode and the electrode shaped like a rectangle untwist and block the light in that region from passing through. Front Glass Filter: gives each subpixel in (R,G,B) triad its color. Subpixel addressing used in anti-aliasing. Front Polarizing Film: at a right angle to the back one. 5
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Plasma Display Panel (PDP)
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Raster Graphics System
IO Device System Bus Display Processor CPU System Memory Frame Buffer Video Controller
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Frame Buffer
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Frame Buffer Refresh Refresh rate is usually 60 – 120Hz
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Direct Color Frame Buffer
Store the actual intensities of R, G, and B individually in the framebuffer • 24 bits per pixel = 8 bits red, 8 bits green, 8 bits blue DAC
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Color Lookup Frame Buffer
Store indices (usually 8 bits) in framebuffer Display controller looks up the R,G,B values before triggering the electron guns DAC Color Indices
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