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LCD Television Technology

LCD Television Technology. By Brian Sheskier. What is an LCD Television?. Liquid Crystal Diode LCD’s used widely, such as in microwaves and calculators The twisted nematic (TN) is the most common liquid crystal used in LCD televisions today. Brief LCD History.

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LCD Television Technology

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  1. LCD Television Technology By Brian Sheskier

  2. What is an LCD Television? • Liquid Crystal Diode • LCD’s used widely, such as in microwaves and calculators • The twisted nematic (TN) is the most common liquid crystal used in LCD televisions today

  3. Brief LCD History • Liquid crystals were discovered by Austrian botanist Friedrich Reinitzer in 1888 • Melted cholesterol benzoate, noticed it became a cloudy liquid then cleared up as temp. rose • The liquid turned blue before crystallizing as it was cooled

  4. Twisted Nematic Liquid Crystal • Used in most display applications today, such as LCD televisions and LCD monitors • Has a naturally crystalline structure • Reacts to electric currents in particular ways, usually by untwisting to different degrees depending on the voltage of the current it is exposed to

  5. “Liquid” Crystal • Liquid in the sense of the crystals twistability and relative pliability in reaction to the voltage of the current it is exposed to

  6. How do LCD TV’s Work? • Work by blocking light • Sandwich a solution of TN liquid crystals between two perpendicularly aligned sheets of polarized glass • the intensity of the light is manipulated as it passes through this structure and out the other glass panel at the other end

  7. How LCD’s Work Cont. • Liquid crystals then untwist depending on the voltage of electrical charge passing through them • Intensity of light able to pass through second glass pane is affected • Display can switch between light and dark states

  8. Light State- A state of the display where the liquid crystals are fully twisted Dark State- A state of the display where the liquid crystals are completely untwisted Light State/Dark State

  9. Pixels • Tiny segments that make up the LCD display • Manipulated to present information or form images for viewing

  10. Pixel Structure

  11. The process in which pixels are turned off (allowing the passage of light) and on (not allowing the passage of light) Creates the image on the display for the viewer Addressing

  12. Pixels Switched Off -

  13. Pixels Switched On -

  14. Color • Each pixel is divided into 3 sub-pixels: blue, red, and green • These sub pixels work together to produce the overall hue of the LCD’s pixel • 16.8 million colors in total

  15. Advantages of LCD TV’s • Brighter and have higher contrasts than other TV’s (no glare) • 160-degree viewing angle • High dot pitch = sharper and more realistic image • Cooler running temperature • No static images are burned in

  16. Advantages Cont. • Wide and colorful image • High response time- time it takes a pixel to refresh itself, which makes the image appear smoother and not jerky • Long Life • Multi-uses- HDTV, regular TV, home video, any video format is accepted

  17. Disadvantages • Tracking motion isn’t as good as Plasma • Lower contrast ratio • More expensive than Plasmas • Not common over 42-inches

  18. Does anyone know how big the world’s largest LCD TV is?

  19. Largest LCD TV • Largest LCD TV is 108” • Introduced by Sharp at an electronics show in Las Vegas

  20. http://electronics.howstuffworks.com/lcd5.htm http://hometheater.about.com/od/lcdtvfaqs/f/lcdfaq2.htm Two Links to Outside Websites

  21. References • www.about.com • www.howstuffworks.com • www.plasmatvbuyingguide.com • www.wikipedia.org

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