003+10-13-11+Chapter+3+_Part+2_

003+10-13-11+Chapter+3+_Part+2_ - Chapter 3 Hardware...

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Slide 1 Chapter 3 Hardware Basics: Peripherals
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Slide 2 Chapter 3 Output: From Pulses to People Screen Output A monitor or video display terminal (VDT) displays characters, graphics, photographic images, animation and video Video adapter—connects the monitor to the computer VRAM or video memory—a special portion of RAM to hold video images the more video memory, the more picture detail is displayed Also affects the resolution and frame-rate of moving images
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Slide 3 Chapter 3 Output: From Pulses to People Monitor size: Measured as a diagonal line across the screen Resolution: The number of pixels displayed on the screen Pixels (or picture elements): tiny dots that compose a picture The higher the resolution, the closer together the dots Image quality is affected by resolution and color depth (or bit depth) Color depth refers to the number of different colors a monitor displays at one time
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Slide 4 Chapter 3 Output: From Pulses to People Color depth 1-bit depth 16-bit depth 8-bit depth 4-bit depth
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Slide 5 Chapter 3 Output: From Pulses to People Monitor classes CRTs (cathode-ray tubes) LCDs (liquid crystal displays) are now more popular Overhead projection panels Video projectors Portable computers
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Slide 6 Output- information for the user Monitor - screen soft copy intangible temporary Screen capture CTRL-ALT-PRINTSCREEN On Mac Command-shift-3 (copies screenshot to clipboard) Paste into the application of your choice Doesn’t work while running some applications
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Slide 7 CRT - cathode ray tube raster scanning sweeping electron beams across the back of the screen several hundred horizontal lines phosphorous coating glows, RGB (Red Green Blue) » temporary excitation » refreshes often » scan rate in megahertz (MHz) » indicates the number of times it refreshes » >60 times/second sufficient » most people prefer (80-100) » < 60 =flicker » interlaced (all even, all odd, etc) » non-interlaced (in order)
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Slide 8 resolution, dot pitch pixel – all images made up of pixels addressable dots, each with an x/y coordinate usually about 72dpi (dots per inch) resolution = how many pixels on the screen? dot pitch space between dots Smaller number = better quality image Examples CRT – 21 in screen - 1600 x 1280 Pixels Resolution - 0.22 mm Pitch 22" Widescreen LCD Monitor - 1680 x 1050 resolution .282mm Pitch
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display types – a brief history Monochrome – one color (white on black, green on black, etc.) CGA
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This note was uploaded on 11/25/2011 for the course CMPE 03 taught by Professor Geraldmoulds during the Fall '11 term at UCSC.

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003+10-13-11+Chapter+3+_Part+2_ - Chapter 3 Hardware...

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