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Computer Monitors

Computer Monitors. B. Konkoth. Types of monitors. CRT Cathode Ray Tube LCD Liquid Crystal Display. CRT. The filaments at the back of the cathode tube shoot a beam of electrons to the screen at the front of the tube

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Computer Monitors

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  1. Computer Monitors B. Konkoth

  2. Types of monitors • CRT • Cathode Ray Tube • LCD • Liquid Crystal Display

  3. CRT • The filaments at the back of the cathode tube shoot a beam of electrons to the screen at the front of the tube • This screen is coated with phosphor that glows when struck by the electron beam.

  4. LCD • An LCD panel produces an image using a liquid crystal material made of large, easily polarized molecules

  5. Active matrix Most common Contains cells of liquid crystal, a matrix of thin-film transistors (TFT) provides a much brighter, sharper display Passive matrix Dual-scan display Has a row of transistors running on the top of the screen as well as the left of the screen 2 types of LCD panels

  6. Features of a monitor

  7. Video cards • Interface between the monitor and the computer. • Also called graphic adapters, video boards, graphics cards, or display cards. • Sometimes the video controller with a video port is integrated into the motherboard.

  8. Video card

  9. Methods of data transfer • RGB video port • standard method of passing three separate signals for red, green, and blue which most video cards and CRT monitors use. • uses a regular 15-pin Super VGA port

  10. Methods of data transfer • DVI port - Digital Visual Interface port • digital interface standard used by digital monitor such as a digital flat panel monitor, and digital TVs (HDTV). • for a video card that only has a DVI port, you can purchase a VGA converter so you can connect a standard VGA cable to use a regular analog monitor.

  11. Methods of data transfer • S-Video – Super Video • this method sends two signals over the cable, one for color and the other for brightness, and is used by some high end TVs and video equipments. • it uses a 4-pin round port

  12. Methods of data transfer • Composite video • using this method, the red, green, and blue (RGB) are mixed together in the same signal. • this is the method used by television and can be used by a video card that is designed to send output to a TV

  13. Flat Screen Monitors LCD - Plasma • Picture Quality • Normal computing, both LCD and plasma screens will provide sharp and clear display • Watching Blu-Ray movies or playing high-definition games, Plasma screens have less picture lag and sharper color resolution than LCD displays.

  14. LCD - Plasma • Power Usage • LCDs use considerably less power than plasma displays, which use self-lighting pixels • Screen Burn-In • Plasma screens are more likely to experience screen burn-in (the screen becomes permanently discolored where the unchanging image was)

  15. LCD - Plasma • Pixel Levels • LCD screens generally have more pixels per square inch than plasma • makes them ideal if you are working with complex spreadsheet programs or editing software • Size • Plasma monitors are usually ahead of the curve regarding their maximum size • the biggest monitors are plasma

  16. LCD - Plasma • Lifespan • LCD monitors tend to be rated for 60,000-plus hours • Plasma monitors range from 20,000 to 30,000 hours • Price • Comparable pricing

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