Liquid crystal displays

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Liquid crystal displays

  1. 1. LCD<br />The Liquid Crystal Display<br />
  2. 2. Computer monitors<br />Television<br />Instrument panels<br />Aircraft cockpit displays sign <br />Video players<br />Gaming devices<br />Clocks<br />Watches<br />Calculators <br />Telephones<br />The Many Uses<br />
  3. 3. The History of LCDs<br />Liquid crystal discovered by the Austrian  Fredreich Rheinizer in 1888.<br />1960: scientists found that liquid crystals could change their properties of light and produce many colours when electricity is passed through<br />early prototypes (late 1960s) were too unstable for mass production<br />British researcher proposed a stable, liquid crystal material: biphenyl<br />
  4. 4. How it all Works<br />LCDs are displays made from liquid crystals<br />Liquid crystals are both solid and liquid, but mostly liquid<br />They can keep their shape like solids, and move around like liquids<br />Their form is changed with heat<br />Liquid Crystals<br />
  5. 5. How it all Works<br />Nematic Phase<br />Liquid crystals have phases; Nematic is one of them<br />In this phase:<br />Molecules are rod shaped<br />They are naturally twisted<br />Electricity (heat) causes them to untwist, and light passes through<br />
  6. 6. How it all Works<br />LCD Parts<br />It has a mirror in back, which makes it reflective. <br />a piece of glass with a polarizing film on the bottom side, and <br />a common electrode plane made of indium-tin oxide on top. A common electrode plane covers the entire area of the LCD. Above that is the layer of liquid crystal substance <br />Layer of Liquid Crystals<br />an electrode in the shape of the rectangle on the bottom.<br />another polarizing film at a right angle to the first one.<br />
  7. 7. Typical Specs<br />Color LCDs have at least 3subpixels, with red, green, and blue filters<br />the intensity of each sub pixel can range over 256 shades.<br />Combining the sub pixels produces a possible palette of 16.8 million colors<br />
  8. 8. Future Trends<br /><ul><li>HDTVs use higher resolutions of pixels to create better images
  9. 9. Resolution: number of pixels horizontally by number of pixels vertically</li></ul>1920 x 1080 is resolution for HD<br />1280 x 720 is also HD<br />Old standard TVs used a resolution of up to 400p<br />
  10. 10. Advantages of LCDs Over CRTs<br />LCDs can be constructed much smaller and lighter<br />Are more economical to run, they use less power<br />Generate less heat<br />Create higher quality images<br />Causes less eye fatigue<br />Emit less radiation<br />
  11. 11. Bibliography<br />http://electronics.howstuffworks.com/lcd.htm<br />http://www.explainthatstuff.com/lcdtv.html<br />http://www.essortment.com/hobbies/electronicsques_sbpq.htm<br />

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