An Addressable Controller for a Large Size Display Panel

An addressable controller had to be developed for a large scale advertising display panel numbering some 64000 high-output light-emitting diodes. Custom integration in standard bipolar technology provided an answer to the system design challenge. An on-chip PROM solves the addressing problem while circuit design minimizes power consumption and affords protection against LED failure. This chip illustrates the versatility of bipolar processes in coping with the integration of special functions both digital and analog : the block-diagram exemplified in this instance proves to be of widespread interest.