Lcd Display
Liquid crystal display or LCD is a thin and flat device for display. It is manufactured by a large number of pixels of color or monochrome, which are arranged the right of a light source or reflector. It uses very small amount of electrical energy and is often used in battery devices electronic. The technology used is very different from CRT technology which is used by many desktop monitors. It was used only laptops for a very long time. Only recently have they been proposed as an alternative to CRT monitors. They take less office space and are very much lighter than the CRT monitors. But they are also quite expensive.
Each pixel LCD display a layer of molecules aligned between two electrodes that are transparent and two polarizing filters. Because there is no liquid crystal between filters aligned polarizers, the light that passed through the first filter will be blocked by the second polarizer. The surface is in contact with the crystal is treated to align in the given direction. The direction of alignment is defined by the direction of friction.
Resolution in terms of horizontal and vertical size expressed in pixels, is native supported effects display the better. This is one of the things that sets apart the LCD monitor. Dot Pitch is defined as the distance between two adjacent pixels. It is the minimum for a sharper image. Each pixel is divided into three cells or subpixels. They are colored in red, green and blue. Each subpixel can be controlled independently for millions of combinations and hence colors. Older CRT monitors use phosphors to structure sub-pixel. The electron beam but analog does not affect the sub-pixel accurate.
Color components can be distributed in various geometries, depending on how the monitor should be used. If the software knows the geometry, it can be used to increase the apparent number of pixels using sub-pixel rendering. This type of technique is often used in the text anti-aliasing. Liquid crystal displays are used in digital watches and calculators have separate contact for each segment. Thus, an external dedicated circuit charges each segment individually. This is not possible if the number of elements increases.
Small monochrome displays like those used in personal diaries or notebooks older were as passive matrix structure employing super twisted nematic or double layer STN technology. Here, each line or each column has a single electrical circuit and the pixels are processed according to rows and columns. But as the number of pixels increases, decreases response time and the technique is more feasible.
Modern color displays used in LCD screens and televisions use active matrix structure. An array of thin film transistors (TFT) is added. Each pixel has a dedicated transistor. Active matrix display seems brighter and sharper than passive matrix display of similar size and better response time.
LCD technology has some drawbacks too critical. Resolution of a CRT monitor can be changed without introduction of new artefacts. But LCDs can produce only their native resolution and non native resolutions are achieved by scaling. The Black LCD screen is actually gray because of the presence of a luminous source. This results in lower contrast ratio compared to CRTs. LCDs with cheaper parts can not display as many colors plasma or CRT counterparts.
In addition, an LCD has longer response time compared to plasma or CRT counterparts. Input shift is also present and the angle vision is limited. Despite these drawbacks, an LCD is rapidly gaining importance.
About the Author:
This article can also be accessed in portuguese language from the Article section of page www.polomercantil.com.br/monitor-lcd.php
Roberto Sedycias works as IT consultant for www.PoloMercantil.com.br
Article Source: ArticlesBase.com – The Technology in a LCD Monitor
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