——LED displays are widely employed for advertisements, sports, transportation, Stock markets, traffic signs in public transportation systems, shopping malls, schools, railways etc., The conventional LED display system uses traditional microcontrollers so that many problems such as poor reliability, flickering and more hardware requirement can be seen in display system. This article presents an efficient architecture for controlling LED displays which has the ability to expose monochrome movies and animations. Implementing the LED display screen using 32bit ARM9 (S3C2440) processor reduces the hardware requirement and also provide the speed of refreshing the screen will be high so that we can avoid the flickering in the display. In this article, a new way is implemented to increase the speed of the monochrome display is by scanning 8 rows at a time(row byte scanning) rather than single row(pixel by pixel). Therefore, the speed of refreshing of LED display will be increased. By allowing constant current through the LEDs in the display will increase the reliability of the display. The 8 GPIO lines of ARM processor are connected to the 8 rows of the LED display via 8 bit latches connected to implement rowbyte scanning. Unlike in traditional LED display, rather than many microcontrollers a single ARM processor is enough to refresh the screen. A software tool using JAVA is present in PC to draw animations and send it to the LED display.
展开▼
