LED modular development model: (1) modular led light display, (2) integrated device + PCB board led display manufacturers, (3) light and power integrated led screen rental (4) light source, power, cooling, indoor led display, optical integration, (5) connected to the port, the base standardization. 74HC595 internal circuit of all four groups of control signals RCK 74HC595, SCK, EN all connected together. 74HC595 control signal and the input and line scan 4 groups of serial shift register control signals A, B, C, D constituting the input of the LED module board; after 74HC595 control signal by the driver and four sets of serial shift register output and line scan through the drive control signal A, B, C, D constitutes the output of the LED unit board for input cascade a LED unit board. led screen rental _ Gao Jin photovoltaic (certified) _led display provided by Jinan Optoelectronics Technology Co., Ltd. Gao Jin. Jinan Gao Jin Optoelectronics Technology Co., Ltd. (www.gjlled.cn) is an industry leader in Jinan, Shandong, liquid crystal devices, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Gao Jin photoelectric leadership with the staff warmly welcome all inquiries negotiations to create high gold Photoelectric better future.