Patent ID: 8493293
Filing Date: 2013-07-23
Classification: G09G

Abstract:
1. A current drive system for an electroluminescent display, said system for multi-line addressing said display, the system comprising: a plurality of current mirrors having a plurality of outputs for driving a plurality of drive electrodes of said display, each said current mirror having a reference signal input and arranged to scale the reference signal input according to a mirror ratio determined by the current mirror; and an automatic selector coupled to said current mirror outputs to automatically select from said current mirror outputs including a said current mirror output of a first said current mirror a said current mirror output for providing reference signal inputs to said current mirrors including said first current mirror, wherein said reference signal inputs of said current mirrors are coupled together to provide a common reference signal input, and wherein said automatic selector has an output coupled to said common reference signal input, wherein said selector is configured to select a said current mirror output responsive to voltages on said current mirror outputs, wherein said selector is configured to select a said current mirror output having a voltage closest to a voltage of a power supply line of said current drive system, said power supply line configured to supply power to said plurality of current mirrors.