Patent ID: 8188949

Claim:
Display driver control circuitry for a passive matrix emissive display, the display comprising a plurality of pixels arranged in rows and columns and addressed by row and column electrodes, the control circuitry being configured to address each row in turn to give the appearance of an image on the display, the control circuitry further comprising: a frame memory interface for reading data from a frame memory for presentation on the display; a blank line identifier for identifying one or more substantially blank rows of pixels defined by said data; wherein the control circuitry is further configured to skip past said one or more blank rows of pixels during said row addressing; column driver circuitry comprising at least one column drive output to provide a column drive and a data input to control said column drive based on said frame memory data; and an input configured to receive a reference drive output for scaling the controlled column drive, the control circuitry further comprising said reference drive output, and wherein the reference drive output is configured to vary depending on the number of identified blank rows and to reduce the column drive depending upon the number of identified blank rows of pixels such that a perceived pixel brightness of a plurality of rows remains constant as the number of identified blank rows of pixels varies.