What is TFT LCD

In 1888 Liquid crystal was discovered by Fredreich Rheinizer, LC is nether solid or liquid, by 1965 scientists showed that liquid crystals when charged by an electric current they could change the properties of the light passing through the crystal. By late 1960 British research developed a more stable liquid crystal material.

TFT LCD has a sandwich structure with liquid crystal filled between two glass plates.

 

TFT LCD (Thin Film Transistor Liquid Crystal Display) has a sandwich-like structure with liquid crystal filled between two glass plates.

The amount of light supplied by Back Light is determined by the amount of movement of the liquid crystals in such a way as to generate colour.

TFT Glass has as many TFTs as the number of pixels displayed, while a Colour Filter Glass has colour filter which generates colour. Liquid crystals move according to the difference in voltage between the Colour Filter Glass and the TFT Glass.

Liquid crystal must be driven with an alternating current to prevent any deterioration of image quality This is usually implemented with a frame reversal drive method, in which the voltage applied to each pixel varies from frame to frame. If the LC voltage changes unevenly between frames, the result would be a 30-Hz flicker. (One frame period is normally 1/50 of a second.) Other drive methods are available that prevent this flicker problem.

Generating Colours

The colour filter of a TFT LCD TV consists of three primary colours - red (R), green (G), and blue (B) - which are included on the colour-filter substrate.