Video displays in computer organisation
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This document summarizes different types of video displays used in computer organization. It discusses CRT monitors, which use an electron gun to strike phosphor dots and create an image. It also covers DVST displays, plasma panel displays, LCD displays, and LED displays. LCD and LED displays are now more commonly used due to advantages like thinner designs, lower power consumption, and longer lifespan compared to older technologies like CRT and plasma. The document provides details on the components and workings of each type of display.
Video displays in computer organisation
- 1. Video Displays in Computer Organisation SUBMITTED BY :- MANAV GOEL (16CSU192) KASHIESH PATHAK (16CSU168). SUBMITTEDTO :- DR. A. CHARAN KUMARI CSL212
- 2. Keep em Open
- 3. INDEX :- CRT Monitor DVST Plasma Panel Displays LCD Displays LED Displays
- 4. CRT Monitors : CRT stands for (Cathode RayTube) Monitors, it contains millions of tiny red, green, and blue phosphor dots that glow when struck by an electron beam that travels across the screen to create a visible image. CRTs are multisync monitors, has High Refresh Rates and also has good color Clarity and Depth.
- 5. The illustration below shows how things work inside a CRT : The "cathode" is a heated filament. Its in a vacuum created inside a glass tube.The "ray" is a stream of electrons generated by an electron gun that naturally pour off a heated cathode into the vacuum. Electrons are negative.The anode is positive, so it attracts the electrons pouring off the cathode.This screen is coated with phosphor, that glows when struck by the electron beam. There are three ways to filter the electron beam in order to obtain the correct image on the monitor screen: shadow mask, aperture grill and slot mask.
- 7. DVSTs : DVSTs refers to DirectView StorageTube, it behaves like a CRT with highly persistent phosphor. It is similar to CRT as far as the electronic gun and phosphor-coated mechanisms are concerned. But instead of the electron beam directly writing the pictures on the phosphor coated CRT screen, the writing is done with the help of a fine-mesh wire grid.
- 8. Advantages Refreshingof CRTisnotrequired. Complexpicturescanbedisplayedat highresolution without flicker. It hasflatscreen Disadvantages Donot displaycolors Erasingandredrawingprocesstakes time. Selectiveerasingisnot possible. Unpleasantflash overentire screen Poorcontrast
- 9. Plasma Panel Displays : A plasma display is a computer video display in which each pixel on the screen is illuminated by a tiny bit of plasma or charged gas, somewhat like a tiny neon light. Plasma displays are thinner than cathode ray tube ( CRT) displays. IBM built a monochrome plasma display in the 1980s that displayed orange letters against a black screen.
- 10. Advantages Refreshingisnotrequired Steadyimagefree offlicker Lessbulky thanCRT Allowsselectivewriting anderasing Flatscreenandtransparent Disadvantages Poorresolution (60dots perinch) Complexaddressingandwriting CostlierthanCRT
- 11. LCD : LCDs stands for Liquid Crystal Displays, It is combination of two states of matter, the solid and the liquid. LCD uses a liquid crystal to produce a visible image. Liquid crystal displays are super-thin technology display screen that are generally used in laptop computer screen,TVs, cell phones and portable video games.
- 12. ADVANTAGES :- DISADVANTAGES :- i. It is very compact, thin, and light than CRT displays. ii. The LCD can be made in large sizes of over 60 inch or 150 cm diagonal. iii. It does not affect by the magnetic fields. iv. Due to low power consumption, small heat emitted during operation. v. It does not affect by the magnetic fields. i. In high temperature environments there is loss of contrast. ii. It is relatively bright but not suitable for very brightly environments. iii. It consumed a lot of electricity which produce a lot of heat. iv. It has individual liquid crystals which cannot complete all block of the backlight. v. From the viewing angle, the colour and contrast not consistent.
- 13. LED : LED stands for Light-emitting diodes, its an actually an LCD screen, but instead of having a normal CCFL backlight, it uses light-emitting diodes (LEDs) as a source of light behind the screen. An LED is more energy efficient and a lot smaller than a CCFL, enabling a thinner television screen. There are three main configurations of LED as backlights for television screens: full array, edge lit, and direct lit.
- 14. Advantages :- Disadvantages :- 1. Slim Design. 2. Brighter Images. 3. Better Color. 4. Flicker-Free Images. 5. Better Picture Quality. 6. Longer lifespan and less environmental impact. 7. Lower Power Consumption. 1. LEDs are more expensive than conventional lighting technologies. 2. LEDs can shift color due to age and temperature. 3. LED is a lot thinner than the LCD or Plasma. 4. Contrast ratios not consistent. 5. Much higher price.
- 15. References : Websites: http://en.wikipedia.org ComputerArchitecture and Organization ByA. P.Godse (from books.google.com) Computer Organization By Hamacher andZaky https://www.quora.com/
- 16. ThankYou forYour Time & Attention Have a nice day