THE ORIGIN:
Liquid Crystal Display is a phenomenon for the visualization of pictures and graphics. It is abbreviated as LCD. “Liquid Crystal” was discovered by an Austrian biologist Freedriech Rheiniser in 1888. During the observation of melting process of certain organic material that releases cholesterol, he found out that the material changes into two cloudy liquid. When heated to 145°C and then changes into a clear liquid when heated to 178°C. This observation mark the discovery of Liquid Crystal when German Physicist, O’ Lehmann heard about Rheiniser’s discovery. He began researching and performing experiments on this material. Finally, Lehmann found out that this cloudy liquid has a width of regular array unlike any other liquid, Lehmann named this material “Liquid Crystal” as it possessed a crystal or gel like structure. This technology is found very much common in televisions under the name “LCD TV’s”.
LCD TV’s use this technology for visual outputs. It is different from traditional Cathode Ray Tube (CRT) or Plasma Display (PDP TV). The world famous companies dealing with electronic like the SAMSUNG, SONY, LG, PHILIPS, NOKIA, MOTOROLLA have brought about a revolutionary change in compacting TV and mobile screens.
THE TECHNOLOGY:
LCD technology is based on the property of polarized light. Two thin polarized wires sandwich a thin liquid crystal gel, that is divided into individual pixels. An X/Y grid of wires allows each pixel in the array to be activated individually. When an LCD pixel darkens, it polarizes at 90 degrees to the polarizing screens. This cross polarizing blocks light from passing through LCD screen where that pixel has darkened. The pixel darkens in proportion to the voltage applied to it: for a bright detail, a low voltage is applied to the pixel, for a dark shadow area, a higher voltage is applied. LCD’s are not completely opaque to light, however, some light will always pass through even the darkest LCD pixel.
This voltage variance capacity has come from the electronic (step-down & step-down) transformer rated to be used at 110/250 AC indifferently and universal grounded adapter plugs.
Pixel: An abbreviation for picture element (Pix for picture). It is single point in a graphic image, not a dot or a square but an abstract sample. It can be reproduced at any size without the appearance of visible dots or square. Its intensity is variable viz. red, blue, green, cyan, magenta, yellow, black.
AAKASH SINGHAI
(1 YEAR , EC)
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