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Overview from the Amphoryx site on TFT technology and liquid crystal displays
"An Introduction to TFTs and Their Challenges: The thin film transistor (TFT) is the foundation on which the liquid crystal display (LCD) industry has been built over the last 20 years. TFTs are semiconductor-based devices manufactured directly on one of two glass panels that make up an LCD display. They act as dimmer switches that adjust the brightness of each pixel in a display by controlling the liquid crystals through which the display’s backlighting passes."
Amphoryx quick overview of how displays work, click link for more details