Patent ID: 7218336

Claim:
A method of providing drive signals to an illuminator module having a plurality of channels in a printing application, the method comprising: providing binary image data comprising image bits from a data source to the illuminator module, wherein both a present image bit and a next image bit for a pixel are stored and used to predict a transition type for use in selecting a pulse width modulation value; and converting each image bit to a multi-bit amplitude value within the illuminator module, wherein the conversion of each image bit to the multi-bit amplitude value depends at least on a value of the image bit and which channel is associated with the image bit, the conversion of each image bit to the multi-bit value is performed by using the image bit to control a multiplexer circuit so as to select either a predetermined multi-bit ON value or a predetermined multi-bit OFF value, and the predetermined multi-bit ON and OFF values vary from channel to channel based on a previous calibration of the channels.