Patent ID: 9019181
Filing Date: 2015-04-28
Classification: G09G

Abstract:
1. A driver apparatus for an electroluminescent display comprising a plurality of rows to be scanned and a plurality of columns which intersect said rows to form a plurality of pixels, said driver apparatus comprising: addressable row drivers each connected to an associated row, each row driver applying a row voltage to its associated row when addressed, the value of the row voltage being approximately equal to a numerical average of a threshold voltage for the electroluminescent display and a voltage required to provide a maximum desired pixel luminance for the electroluminescent display; and bipolar column drivers each connected to an associated column, each column driver supplying a column voltage to its associated column, the column voltage being either a positive or negative voltage ramp depending on a desired luminance of the pixel intersecting the associated column that is being addressed, wherein a range of both positive and negative voltage ramps is from zero volts to about one half of the difference between the threshold voltage and the voltage required to provide the desired maximum pixel luminance for the electroluminescent display, wherein during generation of a frame, the row drivers are addressed so that the row voltage is applied in sequence to the rows and while the row voltage is applied to a selected row, the column drivers that are connected to columns that intersect the selected row are conditioned to simultaneously supply the column voltages to the columns, the column voltages comprising both positive and negative voltages.