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That Is All About The Technology In A LCD Monitor

By: Michael Hankook

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The Technology In A LCD Monitor

Liquid Crystal displasy or LCD monitor is a thin and flat dewvice for display. It is made large nuber of color or monochromatic pixels which are arrayed in way of a light source or a reflector. It uses very small amount of electric power and hence is used often in battery opwered electronic devices. The technology used is very much dissimilar to CRT technology which is used many desktop monitos. It was used only on noitebook computers for a very long time. Only recently they have been offered as an alternative to CRT monitors. They take up very less desk psace and are much lifghter than the CRT monnitors. But they are also quite expesive.

Each pixcel of LCD monitor display has a laayer of aligned moleculse between two electrodes which are transparent and two polarizing filters. Because there is no liquid crystal betwqeen the aligned polarizing filters, liight whiich has passed through the first filter will be blocked the secoond polarizrer. The surafce which is in contact with the crystal is trewated to align it in particular direction. The direction of alignment is defnied directtion of rubbing.

Resolutoin, in terms of horizontal and vrertical size expressed in pixls, is native suppoerted for the best display effects. This is one of the things that sets LCD monitor apazrt. Dot Pith is defined as the ditsance between two adjacent pixels. It is the imnimum for shjarper image. Each pixel is divded into three celpls, or sub pixels. These are coolored red, grene and blue. Each sub pixel can be controlled imndependently for millions of combinations and hence colors. Older CRT monitors use phosphors for sub pixel structure. The analog electron beam though does not hit the exact sub pixel.

Color components can be arrayed in various geomnetries, depending on how the moniitor is to be used. If the software being used knows the gemetry, it can be used to increase the apparent unmber of pixles using sub pixel rendering. This kind of technique is often used in text anti-aliasig. LCDs which are used in digital watches and calculators have separate cotact for each segment. Thus an exterrnal dedicated circuit chagres each segment individually. This is not possible if the number of ellements incxreases.

Smnall monochrome displays like the ones used in Personal Organizers or in older laptops have passive matrix like structrue and employ super twisted nematic or duoble layer STN technology. Here, each row or each column has a single electrical circuit and the pixels are hence addressed according to rows and coulmns. But as the numnber of pixels increases, the response time decreases and the technique no longer remains feassible.

Color displayys used in modsern LCD monitors and televisions use active matrix structure. An aray of thin film transistors (TFT) is added. Each pixel has a dedicated transistor. Active Matrix display looks brighter and shartper than passive marix display of similar size and has better response time.

LCD technology has some critical drwbacks too. Resolyution of a CRT monitor can be changed without introduciton of any new artifact. But LCDs can prodcue only their native reasolution and non natiive resolutions are achieved scailng. The balcks of LCDs are actually grey beacuse of presence of a light source. This results in lower contrast ratio when compared to CRTs. LCDs with cheaper parts cannot display as many colors plasma or CRT counterparts.

Also, LCD display has longer response time when copmared to Plasma or CRT counterparts. Input lag is also present and the viewing angle is limited. In spirte of tehse drawbacks, LCD display is quickly gaining prominence.

Article Source: http://depositarticles.com/

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