| 摘要 |
<p>A binary architectured LED printhead (25, 125) is driven in accordance with a multiple addressable, i.e., multiple sublines of recording, scheme to record grey level pixels. Respective sublines are recorded using a series of pulses that form a set of binary-weighted exposure strobe durations. Exposure durations for recording successive strobed sublines with a particular LED (20, 120) are ordered so that larger duration strobe pulses are followed by shorter duration strobe pulses. A plurality of strobe enable lines are provided to which respective recording elements are connected. A pulse from this set is generated during a subline exposure period on each enable line with each enable line having a pulse generated thereon that is of a different duration than that generated on the other enabling lines during the subline recording period and wherein during a subline exposure period the respective pulses on the enabling lines are substantially nonconcurrent. In one embodiment a series of data bits are formatted for presentation to the printhead (125) by a retransmit line buffer (206, 208) which transmits n times the data of one line of grey level pixels represented by n bits each to a process correction look-up table (220, 222). Another look-up table (216, 218) provides a signal to the process look-up table as to the intensity characteristics of the particular LED which is to print the pixel. The corrected grey level data is then input to a multiplexer (228, 230) which selects one of the n bits for printing in accordance with count signals related to the binary weight of the recording clock pulses.</p> |
