Liquid crystal display LCD display principle is: the liquid crystal molecules with the dipole moment on the outside and under the action of the electric field in the arrangement of state changes, so that the liquid crystal display device of the light is modulated, display to show the bright and the dark or transparent and opaque. Each of the liquid crystal display device display pixels are individually controlled field, different pixels of the display according to the control signal of the "command" can be composed of different characters, figures and graphics on the screen. Therefore the establishment of needed to display and control the electric display pixel combination becomes a liquid crystal display driver and LCD controller function.