There are two main principles applied in making LCD. The first principle consists of sandwiching liquid crystals between two finally grooved surfaces where the groves on one surface are perpendicular to the groves on the other. Since molecules on one surface are aligned north to south and the molecules on the other surface are aligned east to west. Then the molecules in between are forced into a twisted state of 90 degrees. Applying a voltage to the liquid crystal rearranges the molecules vertically allowing light to pass through. The second principle of the

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LCD relies on the properties of polarizing filters and light itself. Natural light waves are orientated at random angles. A polarized filter is simply a set of incredibly fine parallel lines. These lines act like a net, blocking all light waves apart from those orientated parallel to the lines. A second polarizing filter with lines arranged perpendicular (at 90 degrees) to the first would therefore totally block this already polarized light. Light would only pass through the second polarizes if its lines were exactly parallels with the first, or if the light itself had been twisted to match the second polarizes. The LCD consists of two polarizing filters with their lines arranged at 90 degrees to each other. When a voltage is applied the liquid crystals in-between twist and realign the lines vertically which then causes a block in the light. In other words if there is no voltage applied the light will be able to pass through, but if there is a voltage applied the light will be blocked. Controlling the different amounts of light

Some common words found in the essay are:
Ray Tube, Unlike CRT, Display Liquid, CRT LCD, LCD CRT, crt monitors, liquid crystal, liquid crystals, lcd monitor, voltage applied, 90 degrees, Display LCD, Liquid Crystal, Crystal Display, molecules surface aligned, light waves, surface aligned, light pass, cathode ray tube, parallel lines, light passing liquid, voltage applied light, lcd monitor viewing,
Approximate Word count = 733
Approximate Pages = 3 (250 words per page double spaced)