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Pannell TFT LCD

What is TFT LCD?

El TFT LCD (Thin Film Transistor Liquid Crystal Display) té una estructura en forma de sandvitx amb cristalls líquids entre dues plaques de vidre.

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

How TFT LCD Pixels Work

A TFT LCD panel contains a specific number of unit pixels often called sub pixels.Each unit pixel has a TFT, a pixel electrode (IT0), and a storage capacitor (Cs).For example, an SVGA color TFT LCD panel has total of 800x3x600, or 1,440,000, unit pixels.Each unit pixel is connected to one of the gate bus-lines and one of the data bus-lines in a 3mxn matrix format. The matrix is 2400x600 for SVGA.

Structure of TFT LCD

Generating Colors

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

How an LCD Panel produces colors?

The elements of this color filter line up one-to-one with the unit pixels on the TFT-array substrate.Each pixel in a color LCD is subdivided into three subpixels, where one set of RGB sub pixels is equal to one pixel.(Each sub pixel consists of what we've been calling a unit pixel up to this point.)

Because the sub pixels are too small to distinguish independently, the RGB elements appear to the human eye as a mixture of the three colors.Any color, with some qualifications, can be produced by mixing these three primary colors.

The total number of display colors using an n-bit LDI is given by 23n, because each sub pixel can generate 2n different transmittance levels.

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