At present in the market, LCD screen has been widely used in all walks of life, such as mobile phones, TV sets, small household appliances, calculators, air conditioning thermostat and so on, screen is also all kinds of, let a person difficult to distinguish. According to my understanding, there are many kinds of LCD screen, in my understanding there are: segment code LCD screen, dot matrix screen, TFT color screen, OLED, LED, IPS and so on. So what’s the difference? 1, segment code LCD screen was early developed in Japan, introduced in China in the 1980s, mainly to replace LED digital tube (composed of 7 pen segments, used to display numbers 0~9), such as calculators, clocks, etc., the display content is digital, also relatively simple. There are many kinds of name, such as pen segment LCD screen, small size LCD screen, figure 8 screen, pattern LCD screen.