LCD

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constructions and working of lcd

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LIQUID CRYSTAL AND VARIOUS LCD MODES OF OPERATION PRESENTED TO DEPARTMENT OF ELECTRONICS AND COMPUTER MAINTENANCE ST. ALOYSIUS COLLEGE JABALPUR (AUTONOMOUS) PRESENTED BY ARUN SINGH

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WHAT ARE LIQUID CRYSTALS? The three most common states of matter are:- solid Liquid gaseous

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GAS USED IN LC’S

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LCD Liquid-crystal display televisions are television sets that use LCD display technology to produce images. Liquid crystal displays consist of liquid crystals that are activated by electric current. The basis of LCD technology is the liquid crystal, a substance made of complicated molecules. LCD in electronic watches and calculators are wide spread.

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The liquid crystalline state was detected more than 100 years ago. In 1888 by Friedrich Reinitzer an Austrian botanist and chemist at the University of Graz.

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TYPES OF LCD Twisted Nematic (TN) High Twisted Nematic (HTN) Super Twisted Nematic (STN)

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Film Compensated Super Twisted Nematic (FSTN) Double Super Twisted Nematic (DSTN) LCDs Color Super Twisted Nematic (CSTN) LCDs

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USE OF LCD They are used in a wide range of applications:- Computer monitors Television Instrument panels Aircraft cockpit displays Signage

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WORKING OF LCD A LCD is a thin, flat electronic visual display that uses the light modulating properties of liquid crystals. LCs do not emit light directly.

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REFLECTIVE TWISTED NEMATIC LCD Polarizing filter film with a vertical axis to polarize light as it enters. Glass substrate with ITO electrodes. The shapes of these electrodes will determine the shapes that will appear when the LCD is turned ON.

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RTN LCD

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Twisted nematic liquid crystal. Glass substrate with common electrode film (ITO) with horizontal ridges to line up with the horizontal filter. Polarizing filter film with a horizontal axis to block/pass light. Reflective surface to send light back to viewer. (In a backlit LCD, this layer is replaced with a light source.)

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REFRENCES BOOK’s – Liquid Crystals Author- H. Stegemeyer

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THANK YOU

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