Patent ID: 7872626

Claim:
A display device comprising: a matrix array of display elements each driven by an input provided on a data conductor; and data conductor addressing circuitry for generating the inputs in response to input data, wherein the data conductor addressing circuitry comprises: a plurality of controllable driver circuits, each for providing an input to an associated data conductor, a number of the driver circuits required for providing data to all the data conductors being dependent on the number of data conductors and the connection arrangement between the driver circuits and the data conductors, wherein the number of controllable driver circuits is at least one greater than the number of driver circuits required for providing data to all data conductors; and a reference driver circuit, outputting a constant reference current that does not change in response to said input data, wherein the reference driver circuit is for dynamically calibrating at least one of the controllable driver circuits whilst the other controllable driver circuits provide inputs to the data conductors, wherein each of said plurality of controllable driver circuits includes a switching block which enables the output of each of said plurality of controllable driver circuits to be connected selectively to the reference driver circuit during a first addressing period to perform a calibration operation and to a respective output of the display device in a further addressing period to perform a driving operation, and wherein the calibration and driving operations for each of said plurality of controllable driver circuits are interchanged during successive addressing periods.