关键词: LED驱动芯片, 归零码, 数字控制模块

Abstract: Based on the analysis of the characteristics of the flexible transparent screen and the application environment, the LED driver chip is designed in the way of single line cascade. In LED application, each LED chip can drive limited number of unit lights. Due to the large size of flexible transparent LED screen, in the display field, the LED driver chip must be connected in series when design its drive circuit in order to drive more unit lights. This paper designs the overall architecture of LED driver chip, and focuses on the design of digital control module in the driver chip by using method of module division to design its circuit. First of all, the modules of the chip are divided and the connection between them is established. Then, the realization method of the digital control module is developed, and the design of the sub module is carried out, including the zero sum return code decode and acquisition module, the serial parallel converse module ,the bad point detection module, etc. At the same time, hardware description language is used to realize the function design of the sub module, and the verification is carried out. Finally, digital control module and chip architecture can be used to realize the function of LED driver chip connected in series, which can meet the requirements of large-scale system such as flexible transparent screen.

Key words: LEDdriverIC, RZcode, digitalcontrolmodule