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About LCD Technology

TFT & TFT LCD

TFT stands for Thin-Film Transistor and TFT-LCD stands for thin-film transistor liquid-crystal display.TFT technology is a new standard these days for manufacturing displays, monitors, laptop screens, and other devices. TFT LCD displays can show crisp text, vivid colors, fast animations, and complex graphics.
TFT LCD monitors, also called flat panel displays, are replacing the old style cathode ray tubes (CRTs) as the displays of choice. Almost all LCD monitors today take advantage of the TFT technology.

How does TFT display work?
Let us start with explanation how a LCD display, a predecessor to TFT LCD, works.
In general, a LCD display comprises of a layer of LCD material and one or more polarizing layers made of plastic, glass, or some other material. A LCD display has a sandwich-like structure with liquid crystals filled between two glass (or plastic or polycarbonate) plates.

A LCD display shows a picture through millions of tiny picture elements called pixels. You can understand a pixel as a tiny dot on your screen.

Pixels are formed by liquid-crystal cells that change the direction of light passing through them in response to an electrical voltage.

These liquid crystals when stimulated by an external electrical charge can change the properties of light passing through them. When you align two polarizing materials with each other, light passes through. When you align one polarizing agent at a 90° angle to the other, light is blocked. Change the voltage, and the amount of light passing through the display is changed.


Liquid crystals in LCD monitor act as a dynamic polarizing agent. They change their orientation when you place a voltage across an LCD cell. The orientation of the polarizing agent under the LCD layer either blocks or passes light. So, where does a TFT come into the game?

A TFT display is an advanced LCD display. A TFT monitor uses so-called thin-film transistor technology to project a picture on the screen. Transistors in a TFT display are used to change the orientation of the polarizing agent. A typical 17-inch TFT monitor has about 1.3 million pixels and 1.3 million transistors. The following text explains TFT in a greater detail..

 

 

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