Around U : 4 LCD TV

LCD TV uses Liquid Crystal Display technology for the display.The term Liquid Crystal is referred to a state between Liquid and solid but exhibits the properties of both.Liquid crystals can exist in one of several distinct phases. One such phase is nematic phase. Nematic phase is characterized by molecules that have no positional order but tend to orient in specific direction. This arrangement of molecules enables the mefiumvto flow as a liquid. When a voltage is applied to a liquid crystal, the crystal part turns itself within liquid.

LCD screen

Liquid crystal display works on the principle of blocking light rather than emitting light. LCDs require backlight as they do not emit light by them. LCDs are light modifiers, not producers. This characteristic is responsible for the low power consumption of the LCD .LCD display consists of an array of tiny segments called pixels that can be manipulated to present information. An LCD screen is thus made up of many layers kept together. Among layers there is a filter layer that has red,green and blue filters for each pixel  element. A liquid crystal layer is sandwiched between two transparent glass plates are  kept adjacent to colour filter plate. The plates have transparent contact tobeach pixel element's colour. Finally ,there is a light source , often a fluorescent light.

Working of LCD display

In their normal state ,the Liquid crystals will be flat so that no light can pass through them to the coloured filters. When electrical charges flow through them from the glass plate in front to the glass plate behind them ,it causes crystal elements to rotate onto their edges,allowing the light behind them to pass through the coloured filter in front of them. Amount of electrical charge decides how much crystals rotate and how much light pass through them. This is how the mix of red, green ,and blue is controlled to give us the whole range of light that we see. The combination of coloured light with the gray scale image of the crystal created as electric current flows through the crystal forms the coloured image. This image is then displayed on the screen.