ABSTRACT
CPU is used to control; complex programmable logic device (CPLD) is used for line scan and column control module; VHDL language is used to design control logic; the scanning system uses time-serial data transmission column, line scan mode. This kind of design makes best of the advantages of CPLD and the EDA design of digital circuits. The hardware circuit design is simple and reliable, with high stability. As a result, the entire display system works smoothly. CPU controls scanning frequency so that the screen does not flicker.
