LCD display device is referred to as LCD, flat panel, composed of a certain number of color or black and white pixels, placed in front of light or reflector. The world's first liquid crystal display device appears at the beginning of 1970s, known as the TN-LCD LCD display, because of its low power consumption by engineers favor, suitable for electronic device using the battery, then extended to the electronic calculator table, etc.. Liquid crystal display (LCD) has been widely used because of its advantages such as light weight, portability, clear display, environmental protection, low power consumption and so on.