All of us are now acquainted with objects containing liquid crystal display. We frequently use them in our lives. They are preferred over other display technologies. The words liquid and crystal seem absolutely opposites of each other. The molecules of solids on one hand are closely packed to each other and have fixed position while on the other hand; liquids can move anywhere. But there are some substances which can subsist in odd circumstances that are a kind of fluid and a kind of solid. It means that crystals in LCD s are neither solid nor liquid.
LCD TV uses liquid crystal display technology to display image. Prior to the invent of LCD TV, televisions had various shortcomings like improper display of speedy actions, one can view the screen by sitting just in front of it or at a minor angular distance because the light thrown by it used to focus in straight line. These problems don`t persist anymore, as LCD TVs, with plasma displays, have overruled the old cathode ray display televisions.
LCD equipment is based on the properties of polarized light. LCDs are not completely opaque to light; however, some light will always go through the darkest LCD pixels. Two transparent electrodes and two polarizing filters contains individual pixel in such a way as if a sheet of tiny particles is associated among them. The axis of broadcast between these polarizing filters is set at 90 degrees angles without any liquid crystals, so that the second polarizer block the light passed by the first filter.
Advances made in this field have enabled it to defeat technologies offered by its opponents. Formerly it was believed that this technology is best only for small-sized televisions. But now it can offer some performance as plasma technology. Although ghosting was a problem when LCD TV was launched but now the producing companies have been able to solve this problem to a large extent.
LCD technology still has a few drawbacks. Attempting to run LCD panels at non- native resolutions, usually results in the panel scaling of the image which introduces blurriness and blackness. Consumer LCD monitors had to be more fragile than their CRT counterparts. Many LCDs are incapable of displaying very low resolution modes due to the scaling limitations. Some LCDs have significant input lag. If the lag delay is large enough, such display can be unsuitable for fast and time-precise mouse operations. LCDs and plasma displays are no doubt superior to other display packages but are still less in use than cathode ray tubes.
Important factors to be kept in mind while evaluating LCD monitors are: the distance between the centers of two adjacent pixels; the smaller the dot pitch size, the less granularity is present, resulting in a sharper image; the vertical and the horizontal size of pixels; the minimum time necessary to change a pixels color or brightness; the size of an LCD panel measured on the diagonal; whether the matix type is active or passive, how many types of colors are supported etc.
Manufacturers have decided to spend any amount in this field in the near future with television expecting to be the main market and computer monitors with LCD displays as the other main market. With advancements in LCD technology, producers are offering televisions with many advantages like lighter weight, lower prices, and high resolutions and above all burning up lesser energy.
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