Liquid Crystal Display Television is one of the hot selling electronic gadgets of late. They are the unrivalled displays in UK market following the ban of Plasma Televisions. LCD Televisions also known as “Transmissive Displays” are made of two thin polarising panels with liquid crystal solution sandwiched in between. The basic principle of LCD technology is based on the polarisation of light, and the front glass panel is etched in a grid format for the easy activation and deactivation of crystal molecules. The grid format in the front glass panel acts as the 2D electrode array which helps to control the functioning of crystal molecules at each instant of time.
 | Liquid Crystals used in the LCD technology are rod shaped, and they can bend light according to the electric current fed in that instance. So the crystal molecules are activated or deactivated according to the input image to reproduce the apt output in the display. When an image is fed into the LCD panel, electric current is passed into the crystals simultaneously depending upon the intensity of colours in each pixels. Thus the molecules act as shutters to prevent light from reaching the output image in darker scenes, and the crystal molecules allows the light to pass through in the lighter shades of the image. There will be variation in the electric current depending upon the intensity of colour, and henceforth the displayed output will be the exact replica of the input video signal. |
| LCD Televisions makes use of TFT Active Matrix, in which Thin Film Transistors are used for the switching pixels On/Off depending upon the input image fed. In LCD television Technology, one pixel comprises three sub-pixels, and they are the primary colours red, blue and green. The pixel response time was one major factor that tricked many manufacturers. Pixel response time is the minimum time period taken by an individual pixel to turn Off/On without blurring. Quick response time is required for the adept delivery of fast paced images, especially motion images. The quicker the response time, the lower the chances for image lag. Image lag was one of the biggest bugbear for big LCD displays, however motion adaptive technologies are developed by the television experts for canny rendition of high-speed motion images. |  |
Backlight system is provided in LCD technology since the crystal molecules does not emit light. Various OEM sources are used so far for giving apt backlight settings. The major three backlight systems in use are EL(Electro Luminescent) system, CCFL( Cold Cathode Fluorescent Lamp) system and LED(Light Emitting Diode) System. CCFL is one of the efficacious and cost effective backlight technique that helps to render life like images with good vibrancy. But with the advancement in technology, LED backlight systems are also incorporated in various high end displays for delivering immaculate images with untarnished image quality.
Plasma Televisions are well known for the pristine image quality, but they were quite annoying for die-hard gamers and people who doubles the display as PC monitors largely. The culprit is image burn-in, which bugs the users and also curtails display life span considerably. However LCD technology is free from this bugbear due to the lack of phosphor coating. In LCD televisions, the colour reproduction is done with the help of 3 sub-pixel colour filters. The major highlight of this technology is the energy efficiency. An LCD display uses only 60 percent of the power used by a similar CRT display or much lesser than that by a Plasma Display. This leads us into the conclusion that LCD televisions are much eco-friendly too, as it is not draining away the energy unlike other displays.
