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TFT Displays Slide 4

TFTs are active-matrix LCDs that have tiny switching transistors and capacitors. These tiny transistors control each pixel on the display and require very little energy to actively change the orientation of the liquid crystal in the display. This allows for faster control of each red, green and blue sub-pixel cell, producing clear fast-moving color graphics. The transistors in the TFT are arranged in a matrix on the glass substrate. Each pixel on the display remains off until addressed by applying a charge to the transistor. Unlike conventional passive-matrix displays, in order to activate a specific pixel, the corresponding row is turned on and a charge is sent down the proper column. This is where the capacitor at the designated pixel receives a charge and is held until the next refresh cycle. Essentially, each transistor acts as an active switch. By incorporating an active switch, this limits the number of scan lines and eliminates cross-talk issues.

PTM Published on: 2012-03-08