LCD TV's are popular beyond expectations due to their crystal clear picture and sound quality. But what is it that makes them such good value for money? What sort of thoughts and inventions have gone into this product to make it so coveted?
Well, to start with, LCD stands for Liquid Crystal Display. Sounds fancy already doesn't it? It's based on the theory of how light interacts with liquid crystals and the technology behind it is called Thin Film Transistor, or TFT.
Cylinder shaped liquid crystals allow light to pass through them in their normal state, which is twisted. However, when they are put in an electrical field they start to untwist depending on the severity of the current and this means they then block light. If the current is varied then the intensity of light can be varied leading to the basic dark and light.
Bravia are a branch of Sony that understand the workings of the LCD TV after concentrating all their efforts into perfecting it. They know only too well that when it comes to the workings of an LCD TV, the crystals are held between two transparent electrodes and two polarizing filters. In laymans terms, liquid crystals sandwiched between two plates of glass.
Vertically and horizontally placed electrodes contact wither side of the crystals and they access the pixels in the crystals and control the electric flow. Still with me?
This is where it gets complicated. A fluorescent back light is diffused by a white panel and then passes through the crystals. The panel is there to ensure uniform light distribution. The front of an LCD panel is made up of a wire 'mesh' which then individually activates each pixel on the screen.
Each molecule of crystal allows a degree of light through depending on the current being passed through it. This is one of the hurdles that has made true black a difficult colour to perfect because there will always be a small amount of light which distorts the blackness.
To control the voltage, there is passive matrix structure and active matrix structure. With passive electrodes, each pixel will be accessed individually. This technology works most efficiently for mobile phones and wristwatches where picture quality is not as expected in a TV.
The LCD television will need the advanced active matrix structure with an additional template of thin film transistors which can them change the colour of each pixel and sub-pixel without affecting others around it. This function means better detail clarity and also better storage of electrical charge.
Each pixel of the LCD TV had three sub pixels of red, blue and green. A colour filter is also added over the crystal layer to produce an overall colour. Colour filters mean all colours from the colour spectrum are filtered and used in immeasurable combinations to form the colour basis of the LCD TV.
If you are a feeling a little baffled by too much science let me make it easier for you. Pop down your nearest electrical store and take a look at the quality of the Bravia LCD TV or the LG lcd tv and see exactly what you can get for your money - trust me, you won't be disappointed.
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