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Raster Graphics Display Hardware.

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Presentation on theme: "Raster Graphics Display Hardware."— Presentation transcript:

1 Raster Graphics Display Hardware

2 Cathode Ray Tube (CRT)

3 Inside a CRT Phosphor's light output decays exponentially; refresh at >= 60Hz 3

4 Liquid Crystal Display (LCD)

5 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

6 Plasma Display Panel (PDP)

7 Raster Graphics System
IO Device System Bus Display Processor CPU System Memory Frame Buffer Video Controller

8 Frame Buffer

9 Frame Buffer Refresh Refresh rate is usually 60 – 120Hz

10 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

11 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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