A pixel, the smallest unit to indicate a picture image, is formed by three sub-pixels consisting of red, green, and blue. The number of pixels arranged in a display determines the resolution of the TFT-LCD. TFT is composed of the data line (image signal transfer) and gate line (TFT on/off signal transfer).
TFT existing in each sub-pixel controls the voltage difference between the TFT glass electrode and the color filter glass electrode in order to adjust the molecular array of liquid crystals. Such a change in the molecule direction of liquid crystals alters the amount of light penetrating the liquid crystal layer. Consequently, the TFT-LCD display shows picture image information.