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