Current drive systems for electroluminescent displays

摘要

This invention relates to systems, methods and apparatus for driving organic light emitting diodes (OLED) displays, in particular those using multi-line addressing (MLA) techniques. Embodiments of the invention are particularly suitable for use with so-called passive matrix OLED displays. A current drive system for an electroluminescent display, the system comprising: a plurality of current mirrors 562a - 562c having a plurality of outputs 564a - 564c for driving a plurality of drive electrodes of said display, each said current mirror having a reference signal input; and an automatic selector 568 coupled to said current mirror outputs to automatically select a said output for providing reference signal inputs to said current mirrors.