LCD mainly consists of LCD black-and-white screen and TFT color screen. The following mainly introduces the relationship between the manufacturing difficulty and size of LCD black-and-white screen: According to expert statistics, the size and process difficulty of LCD segment code screen have such a rule: the larger the size, the more complex the manufacturing process. The main reasons are as follows: The larger the size of LCD, the more difficult it is for staff to operate. The larger the size of LCD is, the higher the requirement of equipment grade is. The larger the size of LCD, the higher the defect rate of the product. The larger the size of LCD, the more bad things will appear, such as darkening.