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Lcd technology

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How LCD works.

How LCD works.

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Lcd technology Lcd technology Presentation Transcript

  • LCD
    Liquid Crystal Display
    Presented By
    Ehtisham Ali
  • What is LCD ?
    A liquid crystal display (LCD) is a thin, flat electronic visual display that uses the light modulating properties of liquid crystals.
    They are used in a wide range of applications including: computer monitors, television, instrument panels, aircraft cockpit displays, signage, etc. They are common in consumer devices such as video players, gaming devices, clocks, watches, calculators, and telephones.
  • Brief History
    1888: Friedrich Reinitzer (1858–1927) discovers the liquid crystalline nature of cholesterol extracted from carrots (that is, two melting points and generation of colours) and published his findings at a meeting of the Vienna Chemical Society on May 3, 1888
    View slide
  • LCD Technology
    Each pixel of an LCD typically consists of a layer of molecules aligned between two transparent electrodes, and two polarizing filters, the axes of transmission of which are (in most of the cases) perpendicular to each other
    View slide
  • How pictures are generated ?
    Comparison of the OLPC XO-1 display (left) with a typical colour LCD
    Example of how the colours are generated (R-red, G-green and B-blue)
    Photo showing sub pixels in detail
  • Resolution Vs. Range
    Fundamentally resolution is the granularity (or number of levels) with which a performance feature of the display is divided. Resolution is often confused with range or the total end-to-end output of the display.
  • Colour Performance
    There are many terms to describe colour performance of an LCD. They include colour gamut which is the range of colours that can be displayed and colour depth which is the colour resolution or the resolution or fineness with which the colour range is divided